Abstract: A work vehicle automatic traveling system includes a route element selecting unit that, on the basis of state information, sequentially selects a next travel route element on which a work vehicle is to travel next, from a travel route element set and a circling route element set. The route element selecting unit includes a cooperative route element selection rule, which is employed when a plurality of work vehicles carry out work travel cooperatively in an area CA to be worked, and an independent route element selection rule, which is employed when a single independent work vehicle among the work vehicles carries out work travel independently in the area CA to be worked. When the independent work vehicle is carrying out independent work travel in the area CA to be worked, and a work vehicle aside from the host vehicle is carrying out circling travel based on the circling route element or is stopped, the next travel route element is selected on the basis of the independent route element selection rule.

Abstract: Provided is a computation device including a communication interface; a first transmission control part for sending a first communication frame at every predetermined cycle via a transmission path; a second transmission control part for sending a second communication frame in response to an arbitrary event request; and a priority management part. Upon receiving an issuance request of a second event request from a second event issuance part, the priority management part waits for completion of sending processing for a second communication frame corresponding to a first event request currently processed by the second transmission control part, and permits issuance of the second event request to the second event issuance part. The second transmission control part suspends processing for a subsequent first event request following the first event request currently processed until completion of processing for the second event request is complete.

Abstract: A mechanism which can easily acquire a connection relationship of each device even in a multilayered network system having a plurality of protocols is provided. A network system has at least one network including a master processing unit and one or a plurality of slave processing units. Each of first, second, and third devices holds characteristic information indicating whether or not the device has a master processing unit or a slave processing unit. The first device includes a network management unit that acquires single-layer network configuration information from each master processing unit included in the network system to generate multilayer network configuration information indicating a connection relationship of each device in the network system.

Abstract: This autonomous work vehicle travel system is provided with: a satellite positioning module 80 that outputs positioning data indicating a vehicle position of a work vehicle 1; an area setting unit that sets an area CA to be worked in a work site; a route managing unit that calculates a travel route element set, which is an aggregate of multiple travel route elements constituting a travel route that covers the area CA to be worked, and storing the travel route element set so as to be readable; a route element selecting unit that selects a next travel route element to be traveled in sequence from the travel route element set; and an autonomous travel controlling unit that causes the work vehicle 1 to travel autonomously on the basis of the next travel route element and the vehicle position.

Abstract: An auto traveling work vehicle includes a first control computation section for outputting a first steering value computed for deviation resolution based on a positional deviation between a target traveling path and a self vehicle position, a second control computation section for outputting a second steering value computed for the deviation resolution based on the positional deviation and a directional deviation which is adjusted with using a weight coefficient which provides a progressively decreasing tendency with increase in the positional deviation, a target steering computation section for outputting a target steering value for traveling along the target traveling path based on the first steering value and the second steering value, a steering driving control section configured to input the target steering value and to output a steering driving signal, and a steering driving section for effecting steering of a steerable wheel based on the steering driving signal.

Abstract: A positioning detection device includes a first obtaining circuit to obtain a satellite signal, a second obtaining circuit to obtain a detection signal of an inertial device, a third obtaining circuit to obtain a traveling state of the vehicle body including straight-traveling and turning of the vehicle body, a first calculator to calculate first positioning information in satellite navigation system to which the satellite signal is applied, a second calculator to calculate second positioning information in inertial navigation system to which the detection signal is applied, a third calculator to calculate third positioning information in Kalman filter to which the first positioning information and the second positioning information are applied, and an output circuit to output the third positioning information when the third obtaining circuit obtains the straight-traveling and to output the first positioning information and/or the second positioning information when the third obtaining circuit obtains the tur

Abstract: A wireless management system for work vehicles includes a first communication device and a second communication device. The first communication device is configured to perform wireless communication in frequency bands to control the work vehicles. The second communication device is configured to perform the wireless communication with the first communication device. The first communication device and the second communication device are configured to select a frequency band from the frequency bands based on wireless transmission data in order to perform the wireless communication for the wireless transmission data in the frequency band.

Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.

Abstract: The hydraulic suspension system comprises a suspension mechanism for a traveling vehicle body, a suspension reference position variation mechanism for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector for detecting a state in which operation of the suspension mechanism has stopped. The control management unit controls the suspension reference position variation mechanism so that when operation of the suspension mechanism is detected by the stopped state detector to be in a stopped state, the operation of the suspension mechanism moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor.

Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.

Abstract: The hydraulic suspension system comprises a suspension mechanism for a traveling vehicle body, a suspension reference position variation mechanism for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector for detecting a state in which operation of the suspension mechanism has stopped. The control management unit controls the suspension reference position variation mechanism so that when operation of the suspension mechanism is detected by the stopped state detector to be in a stopped state, the operation of the suspension mechanism moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor.

Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).

Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.

Abstract: A tractor is provided for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to function via control of the suspension control means.

Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).

Abstract: A tractor is improved for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism effectively functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an adverse event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to effectively function via control of the suspension control means.

Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.

Abstract: A hydraulic suspension system includes a suspension base (16) supporting wheels, a hydraulic cylinder (19) for displaceably suspending the suspension base from a vehicle body, and an oil passage connected to the hydraulic cylinder. An accumulator (21, 23) is incorporated within the oil passage. A flow control valve (51) is incorporated at an oil passage portion between the hydraulic cylinder and said accumulator for controlling an amount of work oil flowing therebetween. A pressure sensor (56) is provided for detecting a cylinder oil passage pressure effective on the hydraulic cylinder. A control unit (57) is provided for controlling operation of the flow control valve, based upon a detection value from the pressure sensor.

Abstract: An arrangement is provided in which the durability of an operation changing means is improved when this means is provided to the suspension mechanism in a suspension structure for a work vehicle. A maximum position (A1) and minimum position (A2) of the operation of the suspension mechanism are detected, and an intermediate position (B1) between the maximum and minimum positions (A1) and (A2) is detected. When the intermediate position (B1) departs from the target range (H1), the operation of the suspension mechanism is changed to the body raising side or body lowering side so that the intermediate position (B1) moves toward the target range (H1).

Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).