An agricultural implement includes at least one row unit having a plurality of support members, each of which is pivotably coupled to an attachment frame or another of the support members to permit vertical pivoting vertical movement of the support members, and a plurality of soil-engaging tools, each of which is coupled to at least one of the support members. A plurality of hydraulic cylinders are coupled to the support members for urging the support members downwardly toward the soil. A plurality of controllable pressure control valves are coupled to the hydraulic cylinders for controlling the pressure of hydraulic fluid supplied to the cylinders. A plurality of sensors produce electrical signals corresponding to predetermined conditions, and a controller is coupled to the sensor and the controllable pressure control valves. The controller receives the electrical signals from the sensors and produces control signals for controlling the pressure control valves.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part and claims priority to
(1) U.S. Provisional 61/798,266, filed Mar. 15, 2013 (Attorney Docket No. 250600-000088PL01);
(2) U.S. patent application Ser. No. 13/893,890, filed May 14, 2013 (Attorney Docket No. 250600-000076USP3), which is a continuation-in-part of U.S. patent application Ser. No. 13/861,137, filed Apr. 11, 2013 (Attorney Docket No. 250600-000076USP2), which is a continuation-in-part of U.S. patent application Ser. No. 13/839,669, filed Mar. 15, 2013 (Attorney Docket No. 250600-000076USP1), which is a continuation-in-part of U.S. patent application Ser. No. 13/589,829, filed Aug. 20, 2012 (Attorney Docket No. 250600-000076USPT);
(3) U.S. patent application Ser. No. 13/359,914, filed Jan. 27, 2012 (Attorney Docket No. 000072USPT); and
(4) U.S. patent application Ser. No. 13/758,979, filed Feb. 4, 2013 (Attorney Docket No. 000062USP3), which is a continuation-in-part of U.S. patent application Ser. No. 13/561,934, filed Jul. 30, 2012 (Attorney Docket No. 000062USP2), which is a continuation-in-part of U.S. patent application Ser. No. 13/075,574, filed Mar. 30, 2011 (Attorney Docket No. 000062USP1), which is a continuation-in-part of U.S. patent application Ser. No. 12/882,627, filed Sep. 15, 2010 (Attorney Docket No. 000062USPT),
all of which are incorporated herein in their entireties.
FIELD OF THE INVENTION
The present invention relates generally to agricultural equipment and, more particularly, to row crop implements having automatic control systems.
In accordance with one embodiment, an agricultural implement is provided for use with a towing frame hitched to a tractor having a hydraulic system for supplying pressurized hydraulic fluid to the implement. The implement includes at least one row unit having (1) an attachment frame adapted to be rigidly connected to the towing frame, (2) a plurality of support members, each of which is pivotably coupled to the attachment frame or another of the support members to permit vertical pivoting vertical movement of the support members, (3) a plurality of soil-engaging tools, each of which is coupled to at least one of the support members, (4) a plurality of hydraulic cylinders, each of which is coupled to one of the support members for urging the respective support member downwardly toward the soil, each of the hydraulic cylinders including a movable ram extending into the cylinder, (5) a plurality of hydraulic lines, each of which is coupled to one of the hydraulic cylinders for supplying pressurized hydraulic fluid to the respective cylinders, (6) a plurality of controllable pressure control valves, each of which is coupled to one of the hydraulic lines for controlling the pressure of hydraulic fluid supplied by the respective hydraulic lines to the respective cylinders, (7) a plurality of sensors, each of which produces an electrical signal corresponding to a predetermined condition, and (8) at least one controller coupled to the sensor and the controllable pressure control valves, the controller being adapted to receive the electrical signal from the sensors and produce a control signal for controlling the pressure control valves.
In one implementation, the plurality of sensors include at least one sensor selected from the group consisting of a pressure sensor detecting the force applied by one of the hydraulic cylinders to the support member to which that cylinder is coupled.
In accordance with another embodiment, an agricultural row unit attachable to a towing frame for movement over a field having varying hardness conditions, comprises a soil-penetrating tool, a gauge wheel mounted for rolling engagement with the soil surface, and a sensor coupled to the tool and the gauge wheel for detecting changes in the difference between the vertical positions of the tool and the gauge wheel, and producing an output corresponding to the changes. A controllable actuator is coupled to the tool for applying a downward pressure on the tool, and a control system is coupled to the actuator and receiving the output of the sensor for controlling the actuator and thus the downward pressure on the tool.
In one implementation, the agricultural row unit is a planting row unit that includes an opening device for opening a furrow into which seeds can be planted, and the soil-penetrating tool is at least one closing wheel for closing the furrow after seeds have been deposited into the furrow.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in which:
DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
Although the invention will be described in connection with certain preferred embodiments, it will be understood that the invention is not limited to those particular embodiments. On the contrary, the invention is intended to cover all alternatives, modifications, and equivalent arrangements as may be included within the spirit and scope of the invention as defined by the appended claims.
Turning now to the drawings, a planting row unit 10 includes a furrow-opening device for the purpose of planting seed or injecting fertilizer into the soil. In the illustrated embodiment, the furrow-opening device is a V-opener 11 formed by a pair of conventional tilted discs depending from the leading end of a row unit frame 12. It will be understood that other furrow-opening devices may be used. A conventional elongated hollow towing frame 13 (typically hitched to a tractor by a draw bar) is rigidly attached to the front frame 14 of a conventional four-bar linkage assembly 15 that is part of the row unit 10. The four-bar (sometimes referred to as “parallel-bar”) linkage assembly 15 is a conventional and well known linkage used in agricultural implements to permit the raising and lowering of tools attached thereto.
As the planting row unit 10 is advanced by the tractor, the V-opener 11 penetrates the soil to form a furrow or seed slot. Other portions of the row unit 10 then deposit seed in the seed slot and fertilizer adjacent to the seed slot, and close the seed slot by distributing loosened soil into the seed slot with a pair of closing wheels 16. A gauge wheel 17 determines the planting depth for the seed and the height of introduction of fertilizer, etc. Bins 18a and 18b on the row unit carry the chemicals and seed which are directed into the soil. The planting row unit 10 is urged downwardly against the soil by its own weight, and, in addition, a hydraulic cylinder 19 is coupled between the front frame 14 and the linkage assembly 15 to urge the row unit 11 downwardly with a controllable force that can be adjusted for different soil conditions. The hydraulic cylinder 19 may also be used to lift the row unit off the ground for transport by a heavier, stronger, fixed-height frame that is also used to transport large quantities of fertilizer for application via multiple row units.
The hydraulic cylinder 19 is shown in more detail in
As can be seen most clearly in
The accumulator 27 includes a diaphragm 28 that divides the interior of the accumulator into a hydraulic-fluid chamber 29a and a gas-filled chamber 29b, e.g., filled with pressurized nitrogen.
As can be seen in
Retracting movement of the ram 25 reduces the volume of the cavity 24 (see
When the external obstruction causing the row unit 10 to rise is cleared, the combined effects of the pressurized gas in the accumulator 27 on the diaphragm 28 and the pressure of the hydraulic fluid return the ram 25 to a lower position. This downward force on the V-opener 11 holds it in the soil and prevents uncontrolled bouncing of the V-opener 11 over irregular terrain. The downward force applied to the V-opener 11 can be adjusted by changing the pressure of the hydraulic fluid supplied to the cylinder 19.
As can be seen in
A similar arrangement is provided at the lower end of the ram 25, where a stem 60 extends downwardly through a hole 61 in the cross bar 30 that is pivotably attached to the linkage assembly 15. A nut 62 is threaded onto the stem 60 to connect the ram to the cross bar 30. The hole 61 is oversized and a rubber washer is installed on the stem 60 between the nut 62 and the cross bar 30 to allow a limited amount of tilting movement of the ram 25 relative to the cross bar 30. Above the cross bar 30, a flange 63 on the ram 25 forms a curved conical surface 64 that engages a mating surface of a curved conical bearing ring 65 that also engages a mating upper surface of a washer 66. Thus, the ram 25 can be tilted relative to the axis of the hole 61, with the flange 63 sliding over the upper surface of the bearing ring 65.
The use of a hydraulic system permits on-the-go adjustments to be made very rapidly because the hydraulic fluid is incompressible and therefore acts more directly than an air system. In addition, hydraulic fluids typically operate at higher pressures, which allow greater changes in applied forces. The accumulator 27 allows the fluid system to flex and float with the changing terrain and soil conditions. The accumulator 27 is preferably centrally mounted so that when any single row unit moves over an obstruction, the down-pressure cylinder 19 moves to displace the hydraulic fluid along a common set of lines connecting all row units. The gas in the accumulator is compressed at the same time, allowing for isolation among the row units so that upward movement of one row unit does not cause downward movement of other row units. Although the illustrative hydraulic ram is single-acting, it is also possible to use a double-acting ram, or a single-acting ram in combination with a return spring.
Another advantage of the compact hydraulic cylinder/accumulator unit is that it can be conveniently mounted to the same brackets that are provided in many row units for mounting an air bag, to control the down pressure on the row unit. For example, in
One benefit of the system of
On wide planters or other equipment, at times 90 feet wide or more and planting at 6 mph or more forward speed, one row unit must often rise or fall quickly to clear a rock or plant into an abrupt soil depression. Any resistance to quick movement results in either gouging of the soil or an uncleared portion of the field and reduced yield. With the row unit having its own hydraulic accumulator, the hydraulic cylinder can move quickly and with a nearly constant down force. Oil displaced by or required by quick movement of the ram is quickly moved into or out of the closely mounted accumulator which is an integral part of each row unit. The accumulator diaphragm or piston supplies or accepts fluid as required at a relatively constant pressure and down force as selected manually or automatically by the hydraulic control system. By following the soil profile closely and leaving a more uniform surface, the toolbar-frame-mounted row unit permits the planter row unit following independently behind to use less down force for its function, resulting in more uniform seed depth control and more uniform seedling emergence. More uniform seedling stands usually result in higher yields than less uniform seedling stands produced by planters with less accurate row cleaner ground following.
The hydraulic cylinder 204 and the accumulator 208 are pivotably mounted as a single unit on the row unit frame 210, with the lower end of the ram 205 pivotably connected to a linkage 211 that carries the closing wheels 16. With this mounting arrangement, advancing movement of the ram 205 in the cylinder 204 tilts the linkage 211 downwardly, thereby urging the closing wheels 16 downwardly. Conversely, retracting movement of the ram 205 tilts the linkage 211 upwardly, thereby raising the closing wheels 16.
The term row unit refers to a unit that is attached to a towing frame in a way that permits the unit to move vertically relative to the towing frame and other units attached to that same towing frame. Most row units are equipped to form, plant and close a single seed furrow, but row units are also made to form, plant and close two or more adjacent seed furrows.
The hydraulic assembly 401 includes a hydraulic cylinder 402, an accumulator protective cover 420, and a hose connection manifold 424. The hydraulic cylinder 402 is generally similar to the hydraulic cylinders 19, 204 described above in reference to
The accumulator protective cover 420 is mounted adjacent to and between a left upper link 410b and the hydraulic cylinder 402. The accumulator protective cover 420 shields from environmental contaminants and physical damage an accumulator 422 (shown in
The hose connection manifold 424, which is described in more detail below in reference to
The attachment of the hoses 426, 428 to the hose connection manifold 424, in a position that is spaced away from the relatively more-cluttered area of the hydraulic cylinder 402 and bracket 414, facilitates easy field servicing of the hoses 426, 428. For example, a user can easily couple/uncouple the hoses 426, 428 to/from the hose connection manifold 424 by having a clear path directly to the hose connection manifold 424.
The main body 433 of the hydraulic cylinder 402 receives a spherical rod 438 for axial mounting below the accumulator receiver 432. The gland 418 is threaded into the hydraulic cylinder 402 after the spherical rod 438 is installed on the hydraulic cylinder 402. The gland 418 contains internal seals and wear rings to hold pressure and seal out contaminants.
The hydraulic cylinder 402 further includes a mounting interface 440 extending from the main body 433 in an opposite direction relative to the accumulator receiver 432. The hose connection manifold 424 is mounted directly to the mounting interface 440 via a plurality of long bolts 442 that are received, respectively, in a plurality of threaded holes 444. An O-ring seal 441 is positioned between the control manifold 424 and the hydraulic cylinder 402 to prevent leakage of hydraulic fluid. The hose connection manifold 424 has a mounting face 456 (shown in
The mounting interface 440 further facilitates a modular exchange between hose connection manifolds of different types. In the current illustration, the hose connection manifold 424 is an example of a standard configuration in which the manifold functions solely to attach hydraulic hoses and to circulate hydraulic fluid between the hydraulic source and the hydraulic cylinder 402. In an alternative configuration, described in more detail below in reference to
A pair of hose ends 446, 448 are attached to the hose connection manifold 424 at a distal end 450 for coupling the inlet and outlet hoses 426, 428. Specifically, an inlet hose-end 446 is coupled to the inlet hose 426 and an outlet hose-end 446 is coupled to the outlet hose 428. The hose ends 446, 448 are attached to the distal end 450 in a generally parallel configuration relative to a central axis of the hydraulic cylinder 402. As discussed above, the attachment configuration of the hose ends 446, 448 to the hose connection manifold 424 facilitates easy access and servicing of the inlet and outlet hoses 426, 428.
The mounting face 456 includes a plurality of mounting holes 458 arranged in a concentric pattern around a central hydraulic hole 459, through which hydraulic fluid is delivered to the hydraulic cylinder 402. The pattern of the mounting holes 458 matches a pattern of the threaded holes 444 of the mounting interface 440. When the hose connection manifold 424 is mounted to the hydraulic cylinder 402, the long bolts 442 are received through the mounting holes 458.
The hydraulic hole 459 is internally connected to an inlet port 460 and an outlet port 462 via an internal channel 464 (illustrated in
In addition to the offset distance D, the distal end 450 is further defined by a distance X that separates two extreme points of a central axis of the internal channel 464. Specifically, distance X is defined by a point of the central axis near the distal end 450 and a point of the central axis near the mounting end 452. Although the offsetting of the two ends 450, 452 does not impact the flow of hydraulic fluid, the offsetting helps increase clearance space between the hose connection manifold 424 and the linkage assembly 406.
Referring more specifically to
One benefit of the control manifold 524 is that each row unit of a plurality of adjacent row units (in a side-by-side arrangement of row units) has its own pressure control valve. Assuming that the control manifold 524 is mounted in each of the plurality of row units, the down pressure in each row unit can be individually controlled. To achieve individual control, both the inlet hose 426 and the outlet hose 428 of each row unit are connected to the hydraulic source in parallel. For example, the inlet hose of a first row unit is connected to the tractor for supplying constant pressure to the first row unit, and the outlet hose of the first row unit is also connected to the tractor for returning hydraulic fluid from the first row unit. Similarly, the inlet hose of a second row unit is connected to the tractor for supplying constant pressure to the second row unit, and the outlet hose of the second row unit is also connected to the tractor for returning hydraulic fluid from the second row unit. According to this example, the pressure in the first and second row units can be independently controlled.
The hose ends 446, 448 are received in respective inlet and outlet ports 560, 562 for facilitating coupling of the hoses 426, 428 to the control module 542. In contrast to the inlet and outlet ports 460, 462 of the hose connection manifold 424, the inlet and outlet ports 560, 562 of the control manifold 524 are oriented perpendicular to (not parallel to) the central axis of the hydraulic cylinder 402. Nevertheless, a user can still reach with relative ease the connection between hoses 426, 428 and the ports 560, 562 for service-related needs.
The control module 525 includes a hydraulic valve cartridge 531 for reducing and/or relieving pressure in hydraulic cylinder 402. The valve cartridge 531 is enclosed within the control module 525 and has one end inserted in a cartridge port 533 of the connection manifold 527. In response to receiving a control signal, via the control signal wire 529 and the electrical connector 537, the valve cartridge 531 reduces pressure in the hydraulic cylinder 402 and, optionally, acts as a relief valve relieving any shocks or surges that may occur between the hydraulic source and the hydraulic cylinder 402. The control module 525 optionally includes a pressure transducer 535 and/or other embedded electronics.
For ease of access, an integrated electronic connector 537 of the control module 525 is positioned above the valve cartridge 531 for receiving electrical power via an electrical cable (not shown). The electronic connector 537 is angled towards the accumulator protective cover 420 to provide sufficient space for connecting all the required cables and hoses to the control module 525, e.g., the inlet and outlet hoses 426, 428, the control signal wire 529, and the electrical cable.
The hydraulic hole 559 is internally connected to the inlet port 560, the outlet port 562, the cartridge port 533, and a transducer port 539. In contrast to the hose connection manifold 424, the connection manifold 527 includes the additional cartridge port 533 for coupling to the valve cartridge 531 (which controls output of fluid pressure from the hydraulic cylinder 402) and the transducer port 539 for coupling to the pressure transducer 535. The ports are positioned along a control face 541, which is generally perpendicular to the mounting face 556. Thus, although the connection manifold 527 and the hose connection manifold 424 share some similarities (e.g., sharing the modular mounting interface 440), they are different in type at least based on the connection manifold 527 being configured geometrically to facilitate the integration with the control module 525.
Referring generally to
Referring specifically to
The wear ring 652 guides the ram 625 within the cylinder wall 654 of the hydraulic cylinder 619, absorbing transverse forces. The wear ring 652 further prevents (or reduces) metal-to-metal contact between the ram 625 and the cylinder wall 654 and, thus, optimizes the performance of the hydraulic cylinder 619. As such, one benefit of the wear ring 652 is that it prevents or reduces wear of the ram 625 due to frictional contact with the cylinder wall 654. Another benefit of the wear ring 652 is that it tends to act as a seal component (although not necessarily specifically intended to be a seal component). For example, especially during high-speed movement of the ram 625, tight tolerances between the ram 625 and the cylinder wall 654 help achieve a sealing function that prevents, or greatly reduces, undesired fluid flow between the ram 625 and the cylinder wall 654. According to one example, the tight tolerances can range between 0.01 inches and 0.03 inches.
The ram 625 further includes a plurality of intersecting internal passageways, including an axial passageway 660 and a radial passageway 662. The axial passageway 660 starts at the leading edge 650 and continues partially within the ram 624, along the central axis Z, until it intersects with the radial passageway 662. The radial passageway 662 extends perpendicular to the central axis Z between the central axis Z and a peripheral wall of the ram 625.
Similar to a shock absorber, the internal passageways 660, 662 provide a dampening feature to the hydraulic cylinder 610. Specifically, the internal passageways 660, 662 equalize pressure on either side of the wear ring 652 (which tends to act as a seal at high-speed ram velocities). While the hydraulic cylinder 619 is intended to generate pressure, the internal passageways 660, 662 integrate into the hydraulic cylinder 619 damping to control unwanted movement and or pressure. As such, the internal passageway 660, 662 are helpful in preventing damage to the hydraulic cylinder 619 by controlling the damping of the hydraulic cylinder 619. Optionally, in addition to acting as orifices for controlling damping, the internal passageways 660, 662 can be used for mounting check valves to the ram 625. The check valves can further control the damping in the hydraulic cylinder 619. Accordingly, the internal passageways 660, 662 provide a hydraulic cylinder with an integrated damping-control system.
The hydraulic cylinder 700 includes a double-acting ram 705 (which further exemplifies the double-acting ram embodiment identified above in reference to the ram 25) that can move in opposing directions based on fluid pressure received from either a first hose 701a or a second hose 701b. As such, hydraulic fluid is received via the hoses 701a, 701b to act alternately on both sides of the double-acting ram 705 and, consequently, apply alternate pressure in both directions of arrows A-A′. The hydraulic cylinder 700 can, optionally, further includes a biasing element 720 (e.g., mechanical spring, compressed coil spring, pressurized gas) to further add pressure in addition to the pressure provided by the double-acting ram 705. The biasing element 720 can be added on either side of the double-acting ram 705.
One benefit of the double-acting ram 705 is that it can provide both down pressure or up pressure, as needed, for the planting row unit 710. For example, if additional pressure is required to cause the V-opener 711 to penetrate the soil to a required depth, down pressure would be applied. If, for example, the planting row unit 710 is too heavy and the V-opener 711 penetrates the soil in excess of the required depth, then up pressure would be applied (without requiring an additional hydraulic cylinder).
The disk opener 800 further includes a down-pressure cylinder 810, with an integrated control valve 812, that is mounted to a bracket 814. The down-pressure cylinder 810 is generally similar to the hydraulic cylinder 402 (e.g., illustrated in
In addition, the disk opener 800 includes a programmable-logic controller (PLC) or other computer control unit 818 that is also mounted to the bracket 814. Optionally, the control unit 818 is directly integrated into the control valve 812, e.g., into the solenoid 816. According to this optional embodiment, the control unit 818 would be generally similar to the embedded electronics integrated with and described above in reference to the control module 525. The control unit 818 is coupled to a power supply via a control wire 820 and to the control valve 812 via a valve wire 822. The control wire 820 optionally functions to connect the control unit 818 with a control interface such as found in a tractor.
An advantage of mounting the control unit 818 to the row unit, via the disk opener 800, is that it provides better, and specific, control over the control valve 812. As such, for example, each row unit in an arrangement having a plurality of side-by-side row units (such as illustrated below in
Each of the individual feed lines 907 leads to one of the row units and is provided with a separate control valve 910 that receives its own separate control signal on a line 911 from a respective controller 912 (which is integrated in the respective row unit as described above in reference to
Providing both the hydraulic system 952 and the tractor PTO 954 helps provide additional electrical power for electrical components that previously were not included in an agricultural system. For example, adding controllers 912, 915 and control valves 910 to each row unit results in an increased need of electrical power relative to agricultural systems that, for example, lacked individual row-unit control. The electrical generator 956 compensates for and provides the required increased electricity.
The hydraulic cylinders 1019a, 1019b are both mounted at one end to a cross bar 1030, which has been modified in this illustrative embodiment and relative to the cross bar 30 of
One advantage of having two cylinders 1019a, 1019b is that the row unit can be controlled both up and down with more precision. For example, the controlled row unit may have a heavy weight that results in a furrow depth exceeding the desired planting depth. To counter the weight, the second hydraulic cylinder 1019b is used to raise the row unit such that the shallower depth is achieved. As such, the second hydraulic cylinder 1019b acts to subtract (or counter) at least some of the row-unit weight. If the row unit has a light weight that results in a shallower depth than desired, the first hydraulic cylinder 1019a is used to lower the row unit such that the deeper depth is achieved. As such, the first hydraulic cylinder 1019a acts to artificially add weight to the row unit.
The use of this hydraulic cylinder 1119, as a compact hydraulic down-force unit with integral accumulators 1127a, 1127b on each row unit, provides the advantages of quick response and remote adjustability of a hydraulic down-force and up-force control system. If an obstruction requires quick movement, oil can flow quickly and freely between the force cylinder 1119 and the respective adjacent accumulator 1127a, 1127b, without exerting force on other actuators in the system.
The status indicator 1206 can be a single (larger) LED or a plurality of LEDs of various sizes. Alternatively, the status indicator 1206 can include in addition to or instead of the LED an audible indicator to signal a malfunction or other condition of the system 1200.
Optionally, the status indicators 1206 can be integrated with control electronics of the row units 1202 (e.g., control module 525 illustrated in
In another example, the status indicators 1206 are particularly helpful in a system 1200 that is a human-less farming system. The human-less farming system is a system in which robotic machines are moving about in the field to perform tilling, planting, and/or other agricultural functions. Such a system is monitored by a farm manager that is standing, for example, a quarter-mile away from the system. The status indicators 1206 provide the farm manager with quick and easy visual signals that indicate the performance of the system.
Optionally, the system 1200 further emits a wireless signal 1208 for communicating status performance to an online monitoring system. The performance of the system 1200 can be, then, evaluated using an electronic device such as a smartphone.
As the planting row unit 2104 is advanced by the tractor, a pair of cooperating toothed clearing wheels 2122 clear residue from the soil and then other portions of the row unit, such as a V-opener disk 2112, part the cleared soil to form a seed slot, deposit seed in the seed slot and fertilizer adjacent to the seed slot, and close the seed slot by distributing loosened soil into the seed slot with a pair of closing wheels 2114. According to one example, the closing wheels 2114 are CUVERTINE™ closing wheels sold by the assignee of the present application. The CUVERTINE™ closing wheel is an efficient toothed wheel in-between a spading wheel and a rubber wheel.
A gauge wheel 2116 of the planting row unit 2104 determines the planting depth for the seed and the height of introduction of fertilizer, etc. One or more bins 2118 on the planting row unit 2104 carry the chemicals and seed that are directed into the soil.
The planting row unit 2104 is urged downwardly against the soil by its own weight. To increase this downward force, or to be able to adjust the force, a hydraulic or pneumatic actuator 2120 (and/or one or more springs) is added between the front frame 2108 and the four-bar linkage assembly 2110 to urge the planting row unit 2104 downwardly with a controllable force. Such a hydraulic actuator 2120 may also be used to lift the row unit off the ground for transport by a heavier, stronger, fixed-height frame that is also used to transport large quantities of fertilizer for application via multiple residue-clearing and tillage row units. According to one example, the hydraulic actuator 2120 is an RFX™ system sold by the assignee of the present application. The RFX™ system includes a down-pressure actuator that is a compact, fast action actuator, and that is remotely controlled. The RFX™ system includes a nitrogen pressure-vessel that is integrated with the down-pressure actuator. According to other examples, the hydraulic or pneumatic actuator 2120 may be controlled to adjust the downward force for different soil conditions such as is described in U.S. Pat. Nos. 5,709,271, 5,685,245 and 5,479,992.
The planting row unit 2104 further includes a row-clearing unit 2122 having a pair of rigid arms 2124 adapted to be rigidly connected to the towing frame 2106. According to one example, the row-clearing unit 2122 is a GFX™ system (i.e., ground effects row cleaner), which is sold by the assignee of the present application, that is a hydraulically-controlled row cleaner. The GFX™ system is a hydraulically-controlled row cleaner with spring upward pressure and hydraulic down pressure. Furthermore, the GFX™ system is remotely adjusted.
At the bottom of the row-clearing unit 2122, the pair of cooperating toothed clearing wheels 2126 are positioned in front of the V-opener 2112 of the planting row unit 2104. The clearing wheels 2126 are arranged for rotation about transverse axes and are driven by engagement with the underlying soil as the wheels are advanced over the soil. The illustrative clearing wheels 2126 are a type currently sold by the assignee of the present invention under the trademark TRASHWHEEL™. The clearing wheels 2126 cooperate to produce a scissors action that breaks up compacted soil and simultaneously clears residue out of the path of planting. The clearing wheels 2126 kick residue off to opposite sides, thus clearing a row for planting. To this end, the lower edges are tilted outwardly to assist in clearing the row to be planted. This arrangement is particularly well suited for strip tilling, where the strip cleared for planting is typically only about 10 inches of the 30-inch center-to-center spacing between planting rows.
The soil-hardness sensing device 2102 has a first linkage 2130 with an attached blade 2132 and a second linkage 2134 with an attached gauge wheel 2136. According to one example, the linkages are medium FREEFARM™ linkages sold by the assignee of the present application. The FREEFARM™ linkages are generally modular sets of parallel linkages used for different purposes. Also, according to one example, the soil-hardness sensing device 2102 is a FORESIGHT AND CFX™ ground hardness sensor that is sold by the assignee of the present application.
The two linkages 2130, 2134 are parallel to each other and each has a down hydraulic pressure that is controlled independently. Under constant hydraulic pressure, when the soil-hardness sensing device 2102 is moved through the field, the blade 2132 penetrates the soil deeper in soft soil and shallower in hard soil. However, the wheel 2136 rides on the soil surface regardless of the type of soil.
Each linkage 2130, 2134 has a high quality all-stainless steel linear position sensor 2138, 2140 enclosed in a protecting housing, with a cable 2142, 2144 routed to a central processing unit (CPU) 2146, which includes a memory device for storing instructions and at least one processor for executing the instructions. When the blade 2132 or the wheel 2136 moves, a corresponding change in position is detected by the respective position sensors 2138, 2140. The two values from the position sensors 2138, 2140 are outputted as fast as approximately 1,000 times/second and are fed as soil-hardness signals to the CPU 2146, which is a rugged outdoor-rated programmable logic controller that measures the difference in the two values in real time.
In the illustrated example, the CPU 2146 is positioned on the planting row unit 2104. However, in other embodiments the CPU 2146 may be positioned remote from the planting row unit 2104, e.g., in a tractor cabin, on a different planting row unit of a side-by-side row unit arrangement, etc. Furthermore the processor and the memory device of the CPU 2146 can be located in the same place, e.g., on the planting row unit 2104, or in different places, e.g., the processor can be located on the planting row unit 2104 and the memory device can be located in the tractor cabin.
The CPU 2146 averages the values over a predetermined time period (e.g., 0.25 seconds), executes an algorithm with filtering effects (e.g., removes conditions in which a rock is hit by the soil-hardness sensing device 2102), and provides real-time measurement of the soil hardness. The CPU 2146 optionally receives other user-controllable variables for adjusting/tuning the agricultural system 2100. For example, the user-controllable variables may include values for different residue levels, different initial conditions, etc.
To achieve the right amount of pressure for each controllable component (e.g., the row-unit actuator 2120, the row-clearing-unit actuator 2122, and the soil-hardness sensing device 2102), the CPU 2146 outputs the respective signals S1-S3 to the associated control valves V1-V3. For example, in response to receiving a first signal S1 from the CPU 2146, a first control valve V1 outputs a proportional first pressure P1 to the hydraulic actuator 2120 (e.g., RFX™ system) for urging the planting row unit 2104 downwardly. Similarly, in response to receiving a second signal S2 from the CPU 2146, a second control valve V2 outputs a proportional second pressure P2 to the row-clearing unit 2122 (e.g., GFX™ system). The RFX™ system 2120 and the GFX™ system 2122 are controlled independently because residue typically exhibits non-linear behavior. In other words, the independent control of the two systems 2120, 2122 is likely to achieve better depth-control results.
A third control valve V3 receives a third signal S3 from the CPU 2145, in response to which the third control valve outputs a proportional third pressure P3 to the soil-hardness sensing device 2102 (e.g., FORESIGHT AND CFX™ system). The control valves V1-V3 return hydraulic fluid to the hydraulic source at a return pressure PR. Respective transducers for each of the control valves V1-V3 may be used to verify that hydraulic output pressures match the desired values. If a hydraulic output pressure does not match the desired value, the hydraulic output pressure is corrected. Furthermore, each of the control valves V1-V3 has a respective valve response time T1-T3, as discussed in more detail below in reference to determining the timing of applying the appropriate pressures P1-P3.
The CPU 2146 further receives an input speed signal SQ indicative of a speed Q of the agricultural system 2100, which moves typically at about 6 miles per hour, i.e., about 8.8 feet per second. As discussed in more detail below, the speed signal SQ is used to determine the desired values of pressures P1-P3 based on current soil conditions. Furthermore, as discussed in more detail below, the CPU 2146 further outputs two signals, a sensor signal SCFX to the soil-hardness sensing device 2102 and a closing wheel signal SCW to the closing wheel 2114.
The soil-hardness sensing device 2102 is positioned in front of the planting row unit 2104 at a distance D (which is measured generally from a center line of the blade 2132 to a center line of the V-opener 2112), which can be obtained based on the following formula:
Q(speed)=D(distance)/T(time interval) Equation1
Thus, the distance D is calculated as follows:
D=Q*T Equation 2
If D is a known distance (e.g., the distance between the sensed position and position where seed-depositing position) and the speed Q is also known, changes in soil conditions can be anticipated in real time prior to the time when each individual tool on the planter row unit 2104 arrives at any particular soil-change area. For example, assuming that Q is approximately 8.8 feet per second and T is approximately 0.25 seconds, D should be approximately equal to or greater than 2.2 feet. In other words, the minimum distance for D should be approximately 2.2 feet. If D is greater than the minimum value (e.g., D is greater than 2.2 feet), the agricultural system 2100 is calibrated to account for the additional distance. For example, the CPU 2146 will send the respective signals S1, S2 to the associated control valves V1, V2 only after a predetermined period of time Tact, as discussed in more detail below.
Pressures P1 and P2 are continually matched with the corresponding soil conditions. For example, P1 and P2 are increased exactly at the time when harder soil conditions are encountered directly below the clearing wheels 2126. To properly time the change in pressures P1 and P2 correctly, a time variable R refers to the latent processing speed of CPU 2146 and accounts for the time between (a) receiving an input signal by the CPU 2146, (b) sending output signals S1, S2 by the CPU 2146, and (c) responding to the output signals S2, S2 by the control valves V1, V2 with respective outputting pressures P1, P2.
It is noted that each of the control valves V1, V2 has a minimum input time Tmin, and that the distance D (e.g., as measured between the center of the blade 2232 and the center of the V-opener 2212) is directly proportional to the speed Q multiplied by the minimum input time Tmin of the respective control valve V1, V2. It is further noted that a theoretical time Ttheor is directly proportional to the distance D divided by the speed Q (i.e., D/Q), and that an actual time Tact is directly proportional to the theoretical time Ttheor minus the time variable R (i.e., Ttheor−R). Based on these conditions, for outputting pressures P1 and P2, the CPU 146 holds in memory output signals S1 and S2 for a time duration that is equal to the actual time Tact. After the actual time Tact has elapsed, the CPU 146 outputs signals S1 and S2, respectively, to the control valves V1, V2, which respond by outputting pressures P1, P2. Optionally, signals S1 and S2 are outputted as signals ranging between 0-10 volts.
Referring specifically to
Referring specifically to
Referring specifically to
In this embodiment the soil-hardness device 2202 can be a device that is already included in the planting row unit 2204, such as a cutting coulter running directly in-line with the planter row unit or a fertilizer opener positioned off to a side of the planted area. Thus, assuming a side-by-side arrangement of row units, the soil-hardness device can include a fertilizer opener or a no-till cutting coulter in front of every row unit.
The soil-hardness device 2202 includes a blade 2232 and a soil-hardness gauge wheel 2236. The blade 2232 is attached to a blade arm 2260, and the soil-hardness gauge wheel 2236 is attached to a wheel arm 2262. The wheel arm 2262 is biased down by a spring 2264 and pivots relative to the blade arm 2260. An angular encoder 2266 measures changes in an angle θ between the blade arm 2260 and the wheel arm 2262. The angle θ is directly proportional to the depth of the blade 2232 relative to the soil-hardness gauge wheel 2236.
The angle θ, represented by a signal S4, is sent to a CPU 2246 which executes an algorithm to determine corresponding pressure values for the planting row unit 2204. A minimum angle θmin is equal to angle θ when both the blade 2232 and the soil-hardness gauge wheel 2236 are on the soil surface, e.g., when passing over very hard soil conditions or a concrete floor. A depth variable Z indicates a desired blade depth, i.e., blade 2232 penetration into the soil. The angle θ is directly proportional to the depth variable Z, which has a range between an actual (or current) depth value Zact and a theoretical depth value Ztheor.
By way of comparison, in the soil-hardness device 2202 of the current embodiment a controllable pressure P3, which is applied to the soil-hardness device 2202, is varied, but the angle θ between the blade 2232 and the soil-hardness gauge wheel 2236 is maintained generally constant, with the blade 2232 penetrating the soil at a desired blade depth Z. In contrast, in the soil-hardness device 2102 described above in reference to
According to one aspect of the algorithm illustrated in
If Zact=Ztheor=>end Equation 3
If the actual depth value Zact is equal to the theoretical depth value Ztheor (i.e., Zact=Ztheor), the algorithm ends (until the next value is received) (2270H). Optionally, if angle θ is less than minimum angle θmin (i.e., θ<θmin), algorithm ignores changes because those values typically illustrate that the soil-hardness sensing device 2202 has hit a rock.
If the actual value of the depth variable Z is greater than the theoretical value of the depth variable Z (i.e., Zact>Ztheor) (2270E), the controllable pressure P3 that is being applied to the soil-hardness device 2202 is decreased until the actual value of the depth variable Z is equal to the theoretical value of the depth variable Z (i.e., Zact=Ztheor) (2270F):
If Zact>Ztheor=>decrease P3 until Zact=Ztheor Equation 4
If the actual value of the depth variable Z is smaller than the theoretical value of the depth variable Z (i.e., Zact<Ztheor), then the controllable pressure P3 is increased until the actual value of the depth variable Z is equal to the theoretical value of the depth variable Z (i.e., Zact=Ztheor) (2270G):
If Zact<Ztheor=>increase P3 until Zact=Ztheor Equation 5
Thus, according to this algorithm, the desired depth Z of the blade 2232 is maintained constant by varying the pressure P3 in response to detected changes in the angle A. To vary the pressure P3, a user-defined variable M (similar to the user-defined variables K and J described below) is increased or decreased to modify an actual value P3act of the pressure P3 until the desired depth variable Z is achieved. As such, assuming that a theoretical value P3theor of the pressure P3 is being applied to the blade 2232 when the desired depth Ztheor is achieved, and further assuming that P3theor is directly proportional to M*P3act, M is modified until M*P3act is equal to P3theor (and, consequently, the desired depth variable Z is achieved). For example, if the depth variable Z is too small, i.e., the blade 2232 is running too shallow into the soil (e.g., the blade 2232 is moving through a heavily compacted soil area), as detected by a change in the angle θ, M is increased until the actual pressure value P3act is equal to the theoretical value P3theor. Once the theoretical value P3theor is reached, the increased pressure forces the blade 2232 into the soil at the desired depth. Furthermore changes to the pressure P1 and the pressure P2 can be effected based on M*P3act being directly proportional to P1 and P2.
According to another aspect of the algorithm, illustrated in
A signal S5 (illustrated in
If Wact=Wtheor=>end (Equation 6)
If the actual weight value Wact is equal to the theoretical weight value Wtheor (i.e., Wact=Wtheor), the algorithm ends (2272G) until the next measurement.
If the actual weight value Wact is greater than the theoretical weight value Wtheor (i.e., Wact>Wtheor), then the user-defined variable K is decreased (2272E) until the actual weight value Wact is equal to the theoretical weight value Wtheor:
If Wact>Wtheor=>decrease K (Equation 7)
If the actual weight value Wact is less than the theoretical weight value Wtheor (i.e., Wact<Wtheor), then the user-defined variable K is increased (2272F) until the actual weight value Wact is equal to the theoretical weight value Wtheor:
If Wact<Wtheor=>increase K (Equation 8)
The user-defined variable K can be set manually by a user or automatically via a load pin 2282.
Similarly, referring to
If Wact=Wtheor=>end (Equation 9)
If the actual weight value Wact is equal to the theoretical weight value Wtheor (i.e., Wact=Wtheor), the algorithm ends (2274G) until the next measurement.
If the actual weight value Wact is greater than the theoretical weight value Wtheor (i.e., Wact>Wtheor), then the user-defined variable J is decreased (274E) until the actual weight value Wact is equal to the theoretical weight value Wtheor:
If Wact>Wtheor=>decrease J (Equation 10)
If the actual weight value Wact is less than the theoretical weight value Wtheor (i.e., Wact<Wtheor), then the user-defined variable J is increased (2274F) until the actual weight value Wact is equal to the theoretical weight value Wtheor:
If Wact<Wtheor=>increase J (Equation 11)
The user-defined variable J can also be set manually by a user or automatically via the load pin 282.
The tractor 2301 moves at a speed Q, pulling the soil-hardness sensing device 2302A, 2302B, the planting device 2303, and the planting row units 2304A-2304L along a soil area that includes five soil areas 2305A-2305E. Specifically, the soil areas 2305A-2305E includes a right-side outside area 2305A, a right-side wheel area 2305B, a central area 2305C, a left-side wheel area 2305D, and a left-side outside area 2305E. The right-side wheel area 2305B and the left-side wheel area 2305D have soil conditions that are harder than the right-side outside area 2305A, the central area 2305C, and the left-side outside area 305E. The harder soil conditions are caused by the wheels of the tractor 2301 and/or planting device 2303, which form a compacted path as the tractor 301 moves along the soil area. Thus, each of the right-side wheel area 2305B and the left-side wheel area 2305D are areas compacted by the wheels of vehicles.
A first soil-hardness sensing device 2302A controls only the planting row units 2304E, 2304H that are positioned inside the compacted paths of the right-side wheel area 2305B and the left-side wheel area 2305D. A second soil-hardness sensing device 2302B controls all the other planting row units 2304A-2304D, 2304F-2304G, and 23041-2304L, i.e., all the planting row units positioned outside the compact paths of the right-side wheel area 2305B and the left-side wheel area 2305D (and within the right-side outside area 305B, the central area 2305C, and the left-side outside area 2305E). Optionally, any number of soil-hardness sensing devices and any number of planting row units can be used. For example, each of the planting row units 2304A-2304L can have its own designated soil-hardness sensing device.
The soil-hardness sensing devices 2302A, 2302B are positioned at a distance D in front of the planting row units 2304A-2304L. Optionally, each of the soil-hardness sensing devices 2302A, 2302B can be positioned at a different distance in front of the planting row units 2304A-2304L. For example, the first soil-hardness sensing device 2302A can be positioned at a distance X1 in front of the planting row units 2304A-2304L and the second soil-hardness sensing device 2302B can be positioned at a distance X2 in front of the planting row units 2304A-2304L. As currently illustrated in
The soil-hardness sensing devices 2302A, 2302B and the attached planting row units 2304A-2304L are generally configured to sense soil conditions and adjust corresponding hydraulic pressures of Valves A-L as described above in reference to
The soil-hardness sensing devices discussed above can be remotely controlled. For example, the soil-hardness sensing devices 2302A, 2302B can be remotely controlled with a handheld radio-frequency remote controller. By way of example, the remote controller can be used to manually increase and/or decrease the hydraulic pressures in one or more of the soil-hardness sensing devices 2302A, 2302B.
Each of the modular actuators 2220a-2220d provides controllable pressure for urging the respective components downwardly and/or upwardly, based on the mounting and type of actuator. For example, the modular actuators 2220a-2220d can include a double-acting actuator in which the controllable pressure can be applied to urge the planting row 2104, alternately, both upwards and downwards.
A first modular actuator 2220a is configured and mounted to apply a controllable downward force on the entire planting row unit 2204 attached to the rear side of the towing frame 2221. A second one of the modular actuators 2220b is configured and mounted to urge the blade 2232 with a controllable force. A third one of the modular actuators 2220c is configured and mounted to urge the row-clearing unit 2222 with a controllable force. A fourth one of the modular actuators 2220d is configured and mounted to urge the closing wheel 2214 with a controllable force. Thus, for each of the four independently movable components—the planting row unit 2204, the blade 2232, the row-clearing unit 2222, and the closing wheel 2214—the same modular actuator 2220d is configured to achieve the desired force.
One exemplary benefit of having interchangeable actuators 2220a-2220d is that a reduced number of spare parts is required for maintaining the system, thus, reducing cost. Another exemplary benefit is that a farmer or operator does not have to learn how to use and/or replace a separate and distinct type of actuator for each movable component. For example, knowing how to replace or maintain the first actuator 2220a means that the farmer knows how to replace or maintain each of the other three actuators 2220b-2220d. As such, the general result of having interchangeable actuators is reduced cost and a simpler system.
According to alternative embodiments, any number of modular actuators can be adapted for mounting in any agricultural systems. For example, the soil-hardness device 2202 can include two modular actuators of a first type and two modular actuators of a second type. By way of a specific example, the first and second actuators 2220a, 2220b can include a double-acting actuator for applying both upwards and downwards pressure, and the third and fourth actuators 2220c, 2220d can include a single-acting actuator for applying either upward or downward pressure. In other embodiments, the modular actuators are used in systems that lack soil-hardness sensing capabilities.
The modular unit 2400 includes a modular actuator 2420 that is removably attached to the upper support 2404 at a fixed end 2422 and to the swing arm 2408 at a movable piston end 2424. The modular actuator 2420 is illustrated in this exemplary embodiment as a pressure-applying device for the blade 2432. However, to convert the modular actuator 2420 for use with a different component (e.g., to apply pressure to the row-clearing unit 2222), the modular actuator 2420 is removed by removing, for example, an assembly bolt 2426 and/or any other fastener holding the modular actuator 2420 in place relative to the upper support 2404 and the swing arm 2408. Then, the same modular actuator 2420 (without the requirement for additional components) can be fastened to a different component of the soil-hardness device 2202 (e.g., the row-clearing unit 2222). Thus, removal and/or assembly of the modular actuator 2420 is easily achieved with minimal effort and a small number of fasteners.
The ground-hardness sensor 2500 also includes an indicator 2508 that is configured to indicate a performance condition. For example, the indicator 2508 is a light-emitting diode (LED) that displays a continuous green light when the ground-hardness sensor 2500 is functioning properly and a flashing red light when a malfunction occurs.
The ground-hardness sensor 2500 is shielded from the environment with a cover 2510, which is mounted to the distal end 2502 to enclose within the cam 2501. The cover 2510 consists of a translucent or transparent material, such as a clear plastic material, to readily allow visual inspection of the ground-hardness sensor 2500. Thus, one benefit of the cover 2510 is that an operator is not required to remove any parts to determine whether the ground-hardness sensor 500 is operating properly.
The ground-hardness sensor 2500 is provided in addition to or instead of the encoder 266 described above in reference to
The ground-hardness sensor 2500 can be any analog or digital sensor that is capable of measuring an angular displacement. For example, the ground-hardness sensor 2500 can be a linear inductive distance sensor, which is an analog device.
The blade arm 2260 further includes a torsion spring 2512 that engages the shaft 2506 to rotationally bias the shaft 2506 toward an equilibrium point when the shaft 2506 applies a rotational force. The torsion spring 2512 can be attached instead of or in addition to the spring 2264 illustrated in
In addition to applying an opposing force to the rotational force of the shaft 2506, the torsion spring 2512 compresses to dampen the effects of the rotational force of the shaft 2506. The compression provides a smoother change in movement for the blade arm 2260, and increases the torsion spring 2512 resistance to fatigue.
Another benefit of integrating the torsion spring 2512 in the blade arm 2260 is that the torsion spring is protected from environmental conditions, including dirt or mud, that can potentially interfere with the applied compressive force. Yet another benefit of the torsion spring 2512 is that it reduces the number of exposed components, which can be a hazard to human operators.
In the illustrative embodiment of
To reduce the energy required from the limited energy source(s) available from the tractor or other propulsion device used to transport the row units over an agricultural field, the control valves 2602 and 2606 are preferably controlled with a pulse width modulation (PWM) control system implemented in the controller 2613. The PWM control system supplies short-duration (e.g., in the range of 50 milliseconds to 2 seconds with orifice sizes in the range of 0.020 to 0.2 inch) pulses to the actuators 2609 and 2610 of the respective control valves 2602 and 2606 to open the respective valves for short intervals corresponding to the widths of the PWM pulses. This significantly reduces the energy required to increase or decrease the pressure in the hydraulic cylinder 2600. The pressure on the exit side of the control valve is determined by the widths of the individual pulses and the number of pulses supplied to the control valves 2602 and 2606. Thus, the pressure applied to the hydraulic cylinder 2622 may be controlled by separately adjusting the two control valves 2602 and 2606 by changing the width and/or the frequency of the electrical pulses supplied to the respective actuators 2609 and 2610, by the controller 2613. This avoids the need for a constant supply current, which is a significant advantage when the only available power source is located on the tractor or other vehicle that propels the soil-engaging implement(s) across a field.
The hydraulic control system of
As depicted in
Turning now to
As the planting row unit 3011 is advanced by the tractor, a coulter wheel 3015 works the soil and then other portions of the row unit part the cleared soil to form a seed slot, deposit seed in the seed slot and fertilizer adjacent to the seed slot, and close the seed slot by distributing loosened soil into the seed slot with a closing wheel 3018. A gauge wheel 3019 determines the planting depth for the seed and the height of introduction of fertilizer, etc. Bins 3016 and 3017 on the row unit carry the chemicals and seed which are directed into the soil. The planting row unit 3011 is urged downwardly against the soil by its own weight. If it is desired to have the ability to increase this downward force, or to be able to adjust the force, a hydraulic or pneumatic cylinder and/or one or more springs may be added between the front frame 3013 and the linkage 3014 to urge the row unit downwardly with a controllable force. Such a hydraulic cylinder may also be used to lift the row unit off the ground for transport by a heavier, stronger, fixed-height frame that is also used to transport large quantities of fertilizer for application via multiple residue-clearing and tillage row units. This hydraulic or pneumatic cylinder may be controlled to adjust the downward force for different soil conditions such as is described in U.S. Pat. Nos. 5,709,271, 5,685,245 and 5,479,992.
The row-clearing unit 3010 includes an attachment frame that includes a pair of rigid arms 3020 and 3021 adapted to be rigidly connected to the towing frame 3012. In the illustrative embodiment, the arms 3020 and 3021 are bolted to opposite sides of the front frame 3013 of the row unit 3011, which in turn is rigidly attached to the towing frame 3012. An alternative is to attach the row-clearing unit 3010 directly to the towing frame 3012. At the bottom of the row-clearing unit 3010, a pair of cooperating toothed clearing wheels 3022 and 3023 are positioned upstream of the coulter wheel 3015 of the planting row unit 3011.
The clearing wheels 4022, 4023 are arranged for rotation about transverse axes and are driven by the underlying soil as the wheels are advanced over the soil. The illustrative wheels 4022, 4023 are a type currently sold by the assignee of the present invention under the trademark TRASHWHEEL. The toothed wheels 4022, 4023 cooperate to produce a scissors action that breaks up compacted soil and simultaneously clears residue out of the path of planting. The wheels 4021 and 4022 kick residue off to opposite sides, thus clearing a row for planting. To this end, the lower edges are tilted outwardly to assist in clearing the row to be planted. This arrangement is particularly well suited for strip tilling, where the strip cleared for planting is typically only about 4010 inches of the 4030-inch center-to-center spacing between planting rows.
The row-clearing unit 10 is shown in more detail in
The row-clearing wheels 4022 and 4023 are mounted on the trailing ends of the support arms 4030 and 4031, which are bolted or welded together. As can be seen in
The hydraulic cylinder 4070 is shown in more detail in
When the rod 4073 is advanced outwardly from the cylinder 4070, the rod pivots the support arms 4030, 4031 downwardly, thereby lowering the clearing wheels 4022, 4023. Conversely, retracting movement of the rod 4073 pivots the support arms 4030, 4031 upwardly, thereby raising the clearing wheels 4022, 4023.
The accumulator 4079 includes a diaphragm that divides the interior of the accumulator into a hydraulic-fluid chamber 4079a and a gas-filled chamber 4079b, e.g., filled with pressurized nitrogen.
As can be seen in
Retracting movement of the rod 4073 virtually eliminates the annular cavity 4072 (see
When the external obstruction causing the row cleaners to rise is removed from the clearing wheels, the combined effects of the pressurized gas in the accumulator 4079 on the diaphragm 4078 and the pressure of the hydraulic fluid move the rod 4073 to a more advanced position. This downward force on the clearing wheels 4022, 4023 holds them against the soil and prevents uncontrolled bouncing of the wheels over irregular terrain, but is not so excessive as to leave a trench in the soil. The downward force applied to the clearing wheels 4022, 4023 can be adjusted by changing the pressure of the hydraulic fluid supplied to the cylinder 4070.
One benefit of the control systems of
On wide planters or other equipment, at times 90 feet wide or more and planting at 6 mph or more forward speed, one row-clearing unit must often rise or fall quickly to clear a rock or plant into an abrupt soil depression. Any resistance to quick movement results in either gouging of the soil or an uncleared portion of the field and reduced yield. With each row unit having its own separate control, the clearing wheels and the rod of the hydraulic cylinder can move quickly and with a nearly constant down force.
Although the illustrative embodiments described above utilize clearing wheels as the agricultural tools, it should be understood that the invention is also applicable to row units that utilize other agricultural tools, such as fertilizer openers or rollers for firming loose soil.
In order to dynamically control the hydraulic pressure applied to the soil-engaging tools in response to varying soil conditions, each pressure sensor is preferably connected between the ram of each hydraulic actuator 4019 and the support member for the tool controlled by that ram. One such system is illustrated in
The controller 4420 continuously monitors the electrical output signals from the pressure sensors 4411-4413 and uses those signals to produce a separate control signal for each of the valves 4408-4410. These signals control the pressure control valves 4408-4410 to maintain desired hydraulic pressures in the respective hydraulic cylinders 4402-4404 of all the row units. Consequently, if different row units encounter different soil conditions, those conditions are sensed by the respective pressure sensors 4115 and the output signals produced by those sensors cause different hydraulic pressures to be supplied to the different row units, thereby compensating for the particular soil conditions encountered by the different row units. For example, if some or all of the row units 4401 move from a region of relatively soft soil into a region of relatively hard soil, the output signals from the pressure sensors 4411-4413 on those row units will increase. These increases are detected by the controller 4420, which then automatically adjusts the control signals supplied to the corresponding valves to increase the hydraulic pressure supplied to the hydraulic cylinders associated with those valves.
The system of
The controller 4420 may be programmed to use different algorithms to determine how the hydraulic pressure supplied to any given cylinder is adjusted in response to changes in the signals from the pressure sensor for that cylinder. For example, the controller can simply convert the signal from a given pressure sensor into a proportional signal having a linear relationship with the sensor output signal, to produce a control signal that falls within a suitable range for controlling the corresponding pressure control valve (e.g., within a range of 0-10V). Alternatively, the conversion algorithm can apply a scaling factor or gain to the signal from the sensor as part of the conversion. Filters may also be employed in the conversion process, e.g., to ignore sensor signals above a first threshold value and/or below a second threshold value.
The sensor output signals may also be averaged over a prescribed time period. For example, the signal from each pressure sensor may be sampled at predetermined intervals and averaged over a prescribed time period, so that the control signal supplied to the pressure control valve associated with that sensor does not change abruptly in response to only a brief, temporary change in soil conditions. Certain parameters, such as scaling factors, can be made manually selectable to enable an operator selection to customize the behavior of one or more row units to suit personal preferences. Different “mappings” may also be provided to enable an operator to select predetermined sets of variables correlated to different conditions.
The control system described above may utilize position sensors, pressure transducers, load sensors, biased mechanical switches, etc. to detect varying field conditions, and sends signals to a programmable logic controller. The controller in turn analyzes and processes those signals into a corrected usable signal, to be output to a number of integral hydraulic, pneumatic, or electric actuators that control parameters such as the down force on different parts of each row unit. The information collected in the process is preferably also used for a remote interactive display and controller, or for the development of soil condition maps, for use in future field planning, and maintenance.
As the science of agronomy expands, several factors that boost the yield potential of various row crops have been identified. Many of these factors can be controlled and physically manipulated by means of mechanical operations on soil and its accompanying residue and/or additional in-field obstacles such as rocks, waterways, etc. The need to have real-time control over all implement systems is of critical importance as row crop operations move to large platform tools, with single operators.
Additionally, the mapping of in-field obstacles has strong potential to supplement planning for field development and maintenance, such as the removal of obstacles in the field (e.g., rocks, fence posts, etc.), determining appropriate crop rotation, identifying trouble spots for soil erosion, identifying areas that may benefit from tiling, determining appropriate tillage practices, and determining application rates for fertilizers and pesticides.
Row unit down force can be used to control both the depth of a seeding unit or other agricultural implement, and the compaction of soil from a depth-gauging member such as the gauge wheels on a row crop planter. Two important elements of this process are the ability to ensure that the ground-engaging element (e.g., the vee opener blade on a planter row unit) consistently runs at a uniform depth, and that in the process of achieving depth, the gauging element(s) does not excessively compact the ground. Compacted ground is known to inhibit the germination and emergence of row crop seeds, as well as the lateral root growth of a row crop seedling.
Row cleaner down force can be used to control the height and load of a floating row cleaners, which are devices that stretch and deliver row crop residue around the path of a seeding implement, or other depth gauging member to ensure that the depth gauging member runs upon a consistent surface. Running on a consistent surface allows for more uniform depth of the ground-engaging member. In the case of a seeding machine, this promotes consistent depth of seed, which is known to boost yield potential.
A controllable down force can be used to regulate both the depth of a ground-engaging element of a cutting disc, and compaction caused by an adjacent gauge wheel. As an example, consistent depth of fertilizer is known to those skilled in the art to promote ideal nutrient uptake in a row crop plant. Consistent depth can also allow for uniform soil coverage of fertilizer by a furrow-closing device. Uniform coverage can reduce fertilizer loss from surface runoff, and/or loss due to volatilization of nitrogen, and off gassing.
Closing wheel down force can be used to regulate the depth on a furrow-closing device. Consistent, properly calibrated down pressure and depth on a furrow closing device on a seeding unit, or other ground engaging tool, can ensure soil coverage over the furrow without causing excess compaction, or blow-out. This is of particular importance in the placement of row crop seeds. The seed ideally requires the furrow closer to press soil tight to the seed to promote germination, while allowing the surface to remain loose, so that the seedling can emerge with little resistance due to compaction, or crusting.
A depth gauging element actuator is any device that allows for remote adjustment of the depth-gauging element of a row crop tool. Gauging depth is a critical element of almost all row crop tools (seeding units, tillage tools, fertilizer coulters, etc.) In the case of a seeding unit, gauge wheel settings are of primary importance. Uniform depth of the seed is well known to significantly improve yield potential. A real world example: If the gauge wheels on a seeding unit build up with mud, it is important to adjust the stops on the gauge wheels to correct for the added increase in radius on the gauge wheels, and maintain vee-opener blade depth.
In one embodiment, a planting row unit is attachable to a towing frame for movement in a forward direction on a field having soil of varying hardness conditions. The planting row unit includes an opener device forward of the towing frame for preparing the soil for receiving at least one of the fertilizer and the seeds. The opener device includes a soil-hardness sensor for detecting changes in soil-hardness conditions and an opener blade for maintaining, in response to the changes, a substantially constant soil-penetration depth Z in the soil independent of the varying hardness conditions. A modular actuator is mounted to the opener device for applying pressure to the opener blade.
The nature of systems of large numbers of sensors and actuators on agricultural implements can be confusing and cumbersome if the performance of all individual units, and their auxiliary components, cannot be quickly reviewed, and subsequently adjusted in a timely manner. Row crop production is extremely time and soil-condition sensitive, and certain operations benefit tremendously from the easing of real-time operator input control, particularly in the case of systems installed on ultra-wide toolbars (over 60 ft.). In many of these systems, one operator must monitor and make adjustments to 50 or more units. Those units may have 4 or 5 auxiliary systems that also require monitoring and adjustment. The necessity to have a comprehensive high-speed controller and monitor to assist in regulating all actuator activity in a particular system is evident when a single operator must monitor and adjust hundreds of components in real-time. Smaller operators can also realize a significant advantage if methods are properly employed.
A system for integrated control over all onboard actuators on an agricultural implement is described here. Typical of a row crop tool are two primary elements, a ground-engaging component, and a depth-gauging component. There may be more than one ground-engaging component, or depth-gauging component, depending on the tool. The positions of the lowest elements of the individual components are necessarily unequal. The lowest element of the ground-engaging component/s is identified by the extent to which the engaged media (e.g., soil, crop residue) is being physically manipulated. The lowest element of the gauging component regulates the extent to which the ground-engaging components manipulate the engaged media. Regulating the depth on a ground-engaging component is of primary interest.
For measurement and regulation of depth, the chief sensing element of this system is a position sensor. This sensor may be linear or angular in nature and, depending on the method, may be either an absolute or a relative displacement sensor. This sensor may also be a laser rangefinder, or ultra-sonic in nature. This measurement is the primary input to an onboard programmable controller. The physical device generating this primary input may be used on an auxiliary or add-on component, such as a leading furrow opener having both a ground-engaging member and a depth-gauging member fitted with a position sensor situated to measure the relative distance between the ground-engaging member support, and the depth-gauging member support. The device may also be located on the ground-engaging member and depth-gauging member of the primary tool, such as the vee-opener blades on a seeding unit. Supplementary sensors may be installed both as primary sensing units, as well as performance correction devices, on the primary tool and on auxiliary tools. For example, on a seeding device, position sensors may be installed on a leading furrow opener, on a residue-managing device, on the seeding row unit, and on the furrow closer. In many cases, due to cost constraints, operators may choose only one or two position sensors as their primary signals, with the additional sensor(s) only positively contributing to error correction over the entire device. Ideally, all four inputs are utilized for analyzing a row unit, and auxiliary tool position, and outputting a signal to all actuators that re-position the tool, or auxiliary components, to allow for maximum performance from the tool and its auxiliary components.
For correction and determination of performance of row crop tool actuators, the chief sensing element is an integrated pressure transducer. Supplemental performance measurements may include load sensors (which are pre-installed on many ground-engaging tools) or biased proximity switches. These sensors may be used to correct errors that occur in the processing of the position sensor signal, and to verify that the actuators are performing properly. For example, many seeding units are equipped with “load pins” on the upper stops of the units' gauge wheels. Such load pins can generate signals that correlate directly to the signals generated by the position sensors.
Integration of mechanical and electrical devices is possible with outdoor-rated, compact programmable logic controllers. The multi-channel controller in this system receives the input signal of the position sensor of the primary ground-engaging tool, and any additional auxiliary signals, and then processes those signals to generate a base signal that is output to the actuators. This signal may be processed using a number of mathematical methods to output a signal best suited for proper response from a particular actuator. After the signal is processed, it is checked and corrected using the signals from pressure transducers, load sensors or biased proximity switches. For example, in a seeding unit that is equipped with an actuated furrow opener, an actuated residue manager, a row unit down force actuator, and an actuated closing wheel, the primary signal is received from the furrow-opener position sensor. This signal is supplied to a controller that averages or otherwise mathematically manipulates the signal to produce a clean, consistent signal to each component's actuator. This signal typically differs for each actuator, and different computations are typically required for each output signal.
Once the signals of all the sensors have been processed and corrected, and the actuators have been activated, it is preferred to be able to visually inspect the performance of each individual row unit and its auxiliary components. Also, due to the nature of agricultural field work, it is beneficial to be able to control all elements of the system from a remote location such as a tractor cab. To this end, the system may employ a vehicle bus to direct information to an in-cab monitor from the individual row controllers, where the information can be processed and viewed in a variety of different configurations. This information may also be delivered wirelessly to a remote location to alert an operator (e.g., via text messaging or e-mail) when errors occur with an actuator or any of its associated sensors. Some operators will choose to employ all available actuators and all available sensors on all rows, and will want to have direct control row-by-row, in sections, or across the entire toolbar, depending on the operation and the disposition of the operator.
The preferred user interface is an interactive in-cab display having several features that allow the operator to quickly review all systems and adjust the appropriate actuator(s) accordingly. The display may provide row-by-row viewing of the functionality of individual tools and auxiliary components, or the functionality may be viewed over integrated sections, or by averages of units over a particular section. The interface also alerts the operator when any of the various actuators and/or sensors are malfunctioning, and signals which rows or sections need to be checked for repair, or calibration.
There are a large number of mathematical methods by which individual controllers process and output signals. Due to the nature of the engaged media, the controller must sample the position of a particular tool, or component, and create a meaningful signal to be transmitted to the actuator. When in the field, row crop tools often encounter some relatively periodic oscillations due to ridges formed from a variety of pre-plant tools (tillage, fertilizer application, etc.). Additionally the position sensor will register large spikes as a result of encountering massive in-field obstacles (e.g., rocks, concrete, fence posts, etc.). Depending on location, the number of large spikes may be very frequent. The controllers must be able to register a wide variety of oscillations. In general, as ground hardness increases, the actuator must increase down force to push with more force against the hard ground. However, a massive, hard object like a rock requires a different approach. When encountering a massive object, increasing pressure on the actuators will greatly increase general wear on the row crop tool, potentially causing irreparable damage. Thus, when encountering massive objects, the controller preferably recognizes the immovable object and, whenever possible, reduces pressure on the row unit to avoid excessive wear on the tool.
The reading of the signals from the position sensors provides an additional side benefit. As the data stream feeds into the controller, a forward velocity signal and a GPS coordinate signal may simultaneously be gathered from the local CAN. This data collectively can form a soil condition map of the field, identifying large stones or other obstacles that the operator can later efficiently remove by referring to the map. Additionally, when planning for tillage in a particular field, the operator may use the soil condition map to help identify areas that require more or less tillage.
Rocks, clods, soil type, soil hardness, moisture level and other environmental factors can affect the aperiodic oscillations of any ground-engaging tool sensor signals. The system identifies oscillations unique to a particular condition, or obstacle, using wave pattern recognition software. This data stream is synchronized with the GPS signal, and is used to develop a graphical representation of the field, providing a interactive map with GPS coordinate locations of soil compaction, excessive moisture, in-field obstacles such as rocks, or fence posts that the user may want to remove, or identify other conditions that, if treated, may boost soil fertility.
This system may employ the input from any number of cameras, either section-by-section, or row-by-row. There are a variety of small, robust, weatherproof camera systems available on the market. The implementation of visual surveillance is for two primary purposes: visual verification of in-field obstacles for use with soil condition maps, and remote row unit inspection in the case of error signals. When reviewing soil condition maps generated by the system, it is helpful to visually inspect the obstacle, or other condition that is identified by the system. Upon encountering a unique signal of interest, the controller activates a camera remotely to snap a still shot of the obstacle or condition of interest, or if the camera is generating video content, that data stream is time-stamped to easily synchronize with the video. The user may then select an obstacle identified by the system as a signal of interest, and visually inspect the ground, to more easily determine if it is profitable to remove an obstacle or otherwise treat the soil.
As toolbars grow in size, the distance from the ground-engaging tool to the eyes of the operator may be too great for detailed inspection. Further, with the common use of multiple-hose routings for the delivery of products, and with the integration of high-capacity commodity tanks or hoppers into toolbars, it may be impossible for the operator to see some rows from the operator's vantage point. If a sensor in the system sends an error signal, the error may or may not be adversely affecting performance. The cost of stopping an ultra-wide planter, even for a few minutes, during the optimal planting window can be significant. If an implement is sending an error message, but upon visual inspection seems to be functioning adequately, it may prove to be more profitable to keep the implement moving. In some configurations, having the ability to visually inspect areas on an implement that has sensors detecting errors can allow the operator to determine if the problem is critical and needs to be addressed, or if it can wait until the implement consumables are depleted and is stopped for reloading, or is otherwise down for maintenance.
An additional function of the in-cab display is to assist in controlling the depth-gauging member of the row crop tool. The ability to remotely control depth may be of use to operators who are working in fields with widely varying conditions. The ability to slightly raise or lower the ground-engaging element of the tool can be critical in some applications. Additionally, in wet conditions mud build-up on a depth-gauging member may cause erratic and uneven placement of a particular commodity (e.g., seed, fertilizer), which adversely affects yield potential.
The system may include a photogate, sonogate, rangefinder or other sensor that directly determines the height of mud buildup on a gauge wheel. This may also be accomplished by using a sensor capable of determining the angular velocity of a wheel. As the radius on the wheel increases due to mud buildup, the angular velocity changes proportionally, and so may be used to adjust the depth setting to account for the additional radius of the gauge wheel. In either case, sensors determine the average displacement between the opener and the gauge wheel. If a change in relative displacement occurs, the system recognizes that change, and sends a signal to the gauge wheel actuator to make the appropriate adjustment, and maintain a set displacement.
At the top of each column, a displayed number represents the current average performance of the corresponding is in the row units in that particular section, where 100% performance represents sensor signals that cause the controller to produce an output signal that does not require any changes in the respective actuators for that type of tool in the row units in that particular section. For example, in Section 1, the 98% at the top of column “C” means that the average value of the outputs of the actuators for the coulters in the three row units in Section 1 has been within 98% the respective target values for those actuators during the time interval used to compute the average value. The time interval used to compute the average values is typically a sliding window that is 2 to 5 minutes long, during about 120 to 300 sensor readings are taken for each actuator.
As described above, the row planting unit 10 includes multiple row units, such as 16 in number. Each of the row units has a soil-engaging tool 2202, such as a coulter (e.g., a fertilizer coulter) or V-opener or furrow-opening disk or coulter 11, 711, 800, 2112, 3015 (sometimes called CFX™ herein), a row cleaner 2122, 2222 (sometimes called GFX™ herein), and/or a closing wheel 2114, 2214 (sometimes called TFX™ herein). Each of the row units also includes one or more actuators (typically multiple actuators), such as any combination of a hydraulic actuator 2120, 2220 that actuates the row unit, and one or more modular actuators 2420 which cause the soil-engaging tools 2202, 2104, 3015, 2122, 2114 to be urged toward earth (e.g., the soil) according to an actuator signal received from the controller. If there are multiple soil-engaging tools in any given row unit, then the row unit preferably has one actuator for each soil-engaging tool. Thus, if there are four soil-engaging tools on a row unit, then there are four separate actuators, one for each of the four soil-engaging tools. A “soil-engaging tool” is a tool (or implement) that is configured to engage soil or earth under control of a control system.
In some aspects, the planting row unit itself includes one or more tools or implements, such as any combination of a coulter, a gauge wheel, a hardness sensor disk or wheel, and the like. Each “tool” is associated with at least one actuator that controls the one or more tools mechanically coupled to that actuator. To avoid confusion, the row unit itself (whether it is a planter type, a fertilizer type, a strip-till cleaner, a full-width tillage type, etc.) can be considered a tool or implement, such as when it has a gauge wheel or a coulter or the like attached to it. However, in other aspects, each tool can be independently actuated by its own respective actuator, and the graphical user interfaces shown and described herein enable the operator to separately monitor at least one measurable parameter for each such tool on the row unit. Thus, when describing a row unit herein as having or including a soil-engaging tool, it is more accurate to say that each row unit has one or more soil-engaging tools “associated with” the row unit.
Each of the row units includes one or more sensors, such as the position or ground-hardness sensors, pressure sensors, load cells or strain gauges described above. Each sensor measures a parameter related to or indicative of the force or pressure exerted on the mechanism associated with one of the actuators or the position of that mechanism. Each sensor provides an electrical signal indicative of the measured parameter to the controller. The measured parameter can be a force or pressure, or a position related to a distance traveled by the soil-engaging tool, such as a depth of soil penetration by the soil-engaging tool. For example, when the sensor is a position sensor, the measured parameter can be a position related to a distance into the soil penetrated by the soil-engaging tool, e.g., the position can include an angular displacement or distance (e.g., height relative to earth) between the soil-engaging tool, on one hand, and ground or a reference structure on the row planting unit 10, on the other hand. When the sensor is a pressure sensor, the parameter can be a force or a pressure. Force and pressure are related quantities, so these terms are used interchangeably herein. Again, there is preferably one sensor for each soil-engaging tool of the row unit. Thus, if there are four soil-engaging tools on a row unit, then there are four separate sensors, one for each of the four soil-engaging tools. Note that there can be more than one sensor that measures different parameters relating to the same soil-engaging tool. In aspects of the present disclosure, a minimum of one sensor is provided for each soil-engaging tool in each row, though any number of sensors can monitor multiple parameters relating to the soil-engaging tool, such as soil hardness of the soil engaged by the tool, soil moisture, downforce on the tool, load on the tool, vertical position of the tool relative to the surface of the soil, angular position of the tool relative to a fixed reference structure, pressure on the tool, geographic location or position of the tool (e.g., GPS coordinates), and the like.
The video display 6610 is coupled to the controller, which executes machine-readable instructions stored on one or more non-transitory storage media. The machine-readable instructions can be implemented as firmware or software or both and stored on the one or more non-transitory storage media. The controller causes the video display 6610 to display graphical elements thereon, and a conventional touch-sensitive interface (not shown) can be coupled to or integral with the video display 6610 to receive human inputs corresponding to selections of selectable elements displayed on the video display 6610. In the example shown in
In the exemplary screen shot in
The row monitor graphic representations 6620, 6630 and 6640 represent actuators on each of the respective row units. In this example, the row monitor graphical representation 6620 shows measured parameter deviations for an actuator acting on the row unit frame in each of the sixteen row units. The row monitor graphical representation 6630 shows measured parameter deviations of a fertilizer coulter implement for each of the sixteen rows. The row monitor graphical representation 6640 shows measured parameter deviations of a row cleaner implement for each of the sixteen rows. The screen shot 6612 includes a button 6626, which can be actuated through the touch-sensitive interface to show additional tools or implements, such as a cleaning wheel implement. As explained above, each row unit includes a hydraulic actuator 2120, 2220 that actuates the planting row unit 10 as a whole, and the deviation of the measured parameter from the target parameter is shown for each of the row units in the topmost graphical representation 6620.
The screenshot 6612 also includes a target line 6622 that indicates the desired value of a measured parameter on the row monitor graphical representation 6620. In this example, the measured parameter deviation (i.e., an indication of whether and how much the measured parameter deviates from the target parameter) is displayed as an illuminated horizontal bar (though any other graphical representation can be used) in real time as the sixteen row units are moved along the earth. Each of the sixteen row units is shown as one of sixteen vertical columns 6624-1 through 6624-16, each of which graphically resemble a measurement meter for each of three different actuators in the three windows 520, 6630 and 6640.
The target line 6622 bisects each of the vertical meters 6624-1 through 6624-16 such that a deviation above the target line 6622 means that too much force or pressure is being applied by the corresponding actuator, and a deviation below the target line 6622 means that too little force or pressure is being applied by that actuator. Alternatively, a deviation above the target line 6622 can mean that too little force or pressure is being applied by the corresponding actuator, and a deviation below the target line 6622 can mean that too much force or pressure is being applied by that actuator. The target value for each soil-engaging tool can be predetermined and stored in the one or more non-transitory storage media. Such target values are well known to or readily ascertainable by those of ordinary skill in the art to which the present disclosure pertains, and can be dependent upon the type of crop being planted by the row planting unit 10.
In the “Planter Down Force Monitor” window 6620 in the display shown in
The operator can touch any of the measurement meters corresponding to the row units to select that row unit or tool for a more detailed display in windows 6650, 6660 and 6670 on the right-hand side of the display screen. In the example shown in
The display window 6660 displays the latest numerical values measured for each of the tools or implements for the selected row or for the row unit (RFX™) (in this example, the ninth row). In this example, the representations are shown as values in psi (pounds per square inch) and corresponding values in pds (pounds, at the bottom of the implement where it engages the soil) for four tools. Here, a closing wheel tool is not shown on the screenshot 6612, but the operator can use the button 6626 to scroll down to see a row monitor graphical representation for the closing wheel (referred to as “Tfx” in
The screenshot 6612 includes a button 6670 that indicates a row number (here, 9), which corresponds to the row unit selected by the operator as described above. As the row units are being moved along the earth, the operator can select, via the touch-sensitive interface, the button 6670 to change the row unit.
Three other tools are also shown on the row diagnostic screen 6616. Multiple measured or calculated parameters associated with the row cleaner tool in row unit number nine is shown or can be accessed by selecting, via the touch-sensitive interface, the up or down arrows 6692u, 6692d in the tool parameter monitor window 6686-2, multiple measured or calculated parameters associated with the planter tool in row unit number nine is shown or can be accessed by selecting the up or down arrows 6692u, 6692d in the tool parameter monitor window 6686-3, and multiple measured or calculated parameters associated with the closing wheel in row unit number nine is shown or can be accessed by selecting the up or down arrows 6692u, 6692d in the tool parameter monitor window 6686-4. Additional tools in row unit number 9 can be accessed by selecting, via the touch-sensitive interface, the left or right arrows 6692L, 6692R on the row diagnostic screen 6616. Alternately, the left and right arrows 6692L, 6692R can be used to move sequentially between adjacent row unit numbers. For example, when there are four tools in each row unit, then all four tool parameter monitor windows 6682-1 through 6682-4 can be shown on one screen 6616, allowing the left and right buttons 6692L, 6692R to be used to cycle through the next or previous row unit. Alternately, the operator can use the keypad 6672 on the row diagnostic screen 6616 to jump to any row unit number or cycle to an adjacent row unit.
As depicted in
As has been mentioned previously, massive or immovable objects can be encountered in the field. It is important to detect significant spikes and to remove them from the signal. To that end, one method of sensing a spike is running a differentiation process on the input signal, ψ(t), and determining the slope of a function over a time period. If there is a rapid change in slope over a relatively small period of time, it can be assumed that the unit has contacted a massive object. In response, the controller can stop taking measurements from the row unit. After detecting the spike, the controller reverts to a recently generated average signal and hold. After a short time, the controller once again begins sampling the signals from the various row sensors. Eliminating these spikes from the input signal greatly reduces the potential for excess down force on a tool encountering a massive object, which can otherwise greatly reduce the life of a tool.
Another method of eliminating spikes is to average over some time period and check a phase-shifted multiple of the original signal. As an example, a “cutoff” point may be 1 or 1.5 standard deviations at any given time. The phase shift allows the controller to use a recent signal to eliminate any significant spikes.
Aspects of the present disclosure relate to an agricultural implement row unit controller (computer), which is integrated row-by-row, or by section-by-section, for automated control over corresponding actuators of a primary ground engaging tool, and its auxiliary components or attachments, or a group of attachments or tools, for example, any combination of a vee-opener type planter row unit, a fertilizer coulter, a row cleaner, and a closing wheel.
A signal processor operates on input signals from one or more row unit-mounted sensors, and sends the generated output signal to one or more row units, and their auxiliary tools actuators, such as, for example, signals received from position sensors on one or more tools, signals received from pressure transducers on one or more tools, signals received from load sensors of one or more tools, a signal sent to a vee-opener type planter row unit down force actuator, a signal sent to a row cleaner actuator, a signal sent to a fertilizer coulter actuator, a signal sent to a closing wheel actuator.
Aspects of the present disclosure also relate to methods of signal processing that recognizes signature waveforms unique to a particular field condition—a “signal of interest.” Input signals are simultaneously integrated and differentiated to identify local maxima, and minima, and their associated areas over an experimentally determined time period. Discrete-time optimal control operations (e.g., a Monte Carlo algorithm) can provide additional corrections for signal recognition. This signal includes information from a position sensor, a laser rangefinder or other sensor designed to measure relative displacement of a ground engaging device, and its depth gauging member, or a combination of such devices. This method also identifies errors due to sensor malfunction by noting that the data stream is absent, or outside of specification, and in some cases may be used to identify mechanical failures of a particular tool. Signature waveforms unique to a particular condition can be used in combination with the forward speed of the tractor, and a GPS signal to create a map that identifies field conditions, and presents the operator a data stream that can correlate to a map with graphical representations of a particular conditions.
A signal of interest can be, for example, a spike from a massive in-field obstacle identified by a slope approaching infinity over a time period proportional to the product of an averaged in-field obstacle length, and an averaged implement velocity; or a signal of interest can be the signature area, over a predetermined time period, of a semi-regular, semi-repeating signal unique to a particular soils characteristics, such as dry bulk density, wet bulk density, porosity, volumetric water content/saturation, particle size distribution, intergranular contact forces, and shear stress.
Another method of signal correction employs the input signals of existing implement (tool) sensors, and other supplementary sensors to verify that the primary signal generator is functioning properly, and provides additional corrected signals that can be superposed into the base signal to ensure output signals properly affect a given actuator. For example, the signal from a load pin installed on the stops of a gauge wheel on a vee-opener type planter row unit, or the signal of a pressure transducer installed on a hydraulic actuator can be monitored. These signals correct a primary input signal from a position sensor or other displacement sensor, mounted on an opening coulter, which is leading a planter row unit.)
Another aspect includes a system of cameras, mounted on or near a row unit, or section of row units, and oriented so that a particular row unit, or section of row units can be visually inspected remotely. This system has the ability to snap still photographs to be analyzed either in real-time, or for reference later to assist in the development of a field maintenance plan.
A graphical user interface (GUI)/computer collects row controller information via a vehicle bus, and simultaneously displays input and output information of an agricultural implements row units sensors and unit controllers, and the sensors of the row units auxiliary components. This display shows information on any number of row unit actuators either row-by-row or by section averages, such as shown in
A user alert system recognizes errors streaming in from the vehicle bus and alerts the operator remotely. This alert system uses existing mobile platforms to send error information to any number of e-mail addresses, or text enabled wireless devices such as tablets, or mobile phones. This allows both operators and farm managers to be aware of onboard malfunctions as they occur. This system also works in tandem with the camera system to issue a command to a particular camera to generate a visual record of the error.
A system of mapping, created from an incoming data stream from the primary monitors computer, which presents field condition maps, graphically represented on a GUI either in-cab, or on a remote computer. This map exploits the information collected from the pattern-recognition algorithm to make semi-realistic, graphical representations of field conditions. These representations are selectable and the user can zoom-in on a particular area to allow for a better understanding of the level of profit loss that may be associated with a particular field condition. The map would allow to zoom out to view and entire field, or set of adjacent fields, or zoom in for detailed analysis, such as the identification, and graphical representation of rocks, waterways, terraces, sand boils, residue levels, tire tracks, grain cart tracks, or any other condition that may require a change to a particular operation, or may require field maintenance.
A system for sensing, using either a photogate, a sonogate, a laser rangefinder or other such device, to directly detect the change in radius on a gauge wheel as it builds with mud and residue, or sheds mud and residue. This signal is processed to be sent to an actuator that regulates the depth stops on a farm implements depth gauging element. As an alternative, a sensor that detects angular frequency may be used for example, in the case of a gauge wheel, as the angular velocity decreases, it is proportional to an increase in radius, and hence mud or debris on the wheel. This signal can then be used to determine the proper setting on the stops of the gauge wheel. Additionally, variations in optimum depth for a agricultural implement may change as the implement moves through the field, this system allows for on-the-go variations in planting depth to optimize seed placement for a particular set of field conditions.
An actuator that regulates the relative displacement between the lowest members of a ground-engaging tool, and that tools depth-gauging member. This actuator would use receive signals from the sensors to ensure a gauging member of its associated tool has the ideal displacement from the ground-engaging member. This actuator may be hydraulic, or electric in nature, and is robust enough to accommodate the instantaneous forces associated with a particular agricultural implement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrated embodiment and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
22. An agricultural row unit comprising
- a frame having a gauge wheel that engages the soil to control the elevation of the frame,
- a soil-engaging tool coupled to said frame to permit vertical movement of said tool relative to said frame,
- a hydraulic cylinder having a movable ram and containing a pressurized hydraulic fluid for applying at least one of down pressure and up pressure to said tool,
- an uplift energy storage device coupled to said hydraulic cylinder to permit upward movement of said tool in response to increased resistance by the soil to downward movement of said tool, while applying a force resisting said upward movement of said tool, and
- a down pressure energy storage device coupled to said hydraulic cylinder to permit downward movement of said tool in response to decreased resistance by the soil to downward movement of said tool, while applying a force resisting said downward movement of said tool.
23. The agricultural row unit of claim 22 in which said hydraulic cylinder includes a double-acting ram to provide both up pressure and down pressure.
24. The agricultural row unit of claim 22 in which said energy storage devices are accumulators.
25. A method of controlling down pressure in an agricultural row unit that includes a frame having a gauge wheel that engages the soil to control the elevation of the frame, a soil-engaging tool coupled to said frame to permit vertical movement of said tool relative to said frame, and a hydraulic cylinder having a movable ram and containing a pressurized hydraulic fluid for applying at least one of down pressure and up pressure to said tool,
- permitting upward movement of said tool in response to increased resistance by the soil to downward movement of said tool, while applying a force resisting said upward movement of said tool, and
- permitting downward movement of said tool in response to decreased resistance by the soil to downward movement of said tool, while applying a force resisting said downward movement of said tool.
26. The method of claim 25 in which a double-acting ram in said hydraulic is used to provide both up pressure and down pressure.
27. The method of claim 25 in which said forces resisting said upward and downward movements of said tool are energy storage devices.
28. The method of claim 27 in which said energy storage devices are accumulators coupled to said hydraulic cylinder.
Filed: Dec 18, 2015
Publication Date: Apr 14, 2016
Inventor: Joseph D. Bassett (Sycamore, IL)
Application Number: 14/974,087