Condition Responsive Control Of Pump Or Motor Displacement Patents (Class 60/445)
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Publication number: 20140290237Abstract: A control pressure switching valve is disposed between a displacement regulator and a pressure control valve. The control pressure switching valve is switched between a control position (j), in which a load sensing control pressure (PLS) is permitted to be outputted from the pressure control valve to the displacement regulator, and a control release position (k), in which the load sensing control pressure (PLS) to be outputted to the displacement regulator is reduced to a prescribed low pressure value. When the regeneration of a filter is determined to be necessary, the controller switches the control pressure switching valve to the control release position (k). When the load sensing control pressure (PLS) is reduced to the low pressure value with the control pressure switching valve switched to the control release position (k), the displacement regulator increases a delivery displacement of a hydraulic pump, thereby increasing rotational load of an engine.Type: ApplicationFiled: November 19, 2012Publication date: October 2, 2014Inventors: Hajime Yoshida, Hajime Ishii, Yoshifumi Takebayashi, Shuuhei Noguchi, Hajime Kurikuma
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Publication number: 20140260224Abstract: A control system for a variable displacement hydraulic motor. A movable element is movable to adjust the operating displacement of hydraulic fluid through the motor. A positioning actuator moves the movable element between first and second positions to cause maximum and minimum operating displacement of the motor. A range limiting actuator positions a movable stop in a desired position, such that the movable stop interengages the movable element to cause motor displacement between the maximum and minimum operating displacements. The control system thus operates the motor in at least three modes: maximum operating displacement; minimum operating displacement; and an intermediate operating displacement.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: CLARK EQUIPMENT COMPANYInventors: Jeremy Aaron Harms, Daniel James Krieger
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Patent number: 8833065Abstract: A control device for a hybrid construction machine includes a discharge pressure introduction passage that leads a discharge pressure from a variable volume pump to a regulator, and a load pressure introduction passage that leads one of a maximum load pressure of respective actuators and a load pressure of a hydraulic motor to the regulator. A controller, having determined that the actuators are in an inoperative condition on the basis of a detection result from an operating condition detector, excites a solenoid of a solenoid pilot control valve such that a discharge oil from the variable volume pump is led to the hydraulic motor, and controls the regulator such that a differential pressure between the discharge pressure of the variable volume pump and the load pressure of the hydraulic motor is kept constant.Type: GrantFiled: July 2, 2010Date of Patent: September 16, 2014Assignee: Kayaba Industry Co., Ltd.Inventors: Haruhiko Kawasaki, Masahiro Egawa
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Patent number: 8818651Abstract: A flow control system for a hydraulic pump of a construction machine that can variably control a discharge flow rate of the hydraulic pump in accordance with load pressure generated by a hydraulic actuator. According to the system, the discharge pressure of the hydraulic pump and the operation rate of the operation lever for the hydraulic actuators is detected, and standard load pressures of the respective hydraulic actuators are set. If the discharge pressure of the hydraulic pump is higher than preset load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is reduced in proportion to the operation rate in accordance with degrees of loads generated by the hydraulic actuators. If the discharge pressure of the hydraulic pump is lower than the standard load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is controlled in proportion to the operation rate.Type: GrantFiled: June 28, 2010Date of Patent: August 26, 2014Assignee: Volvo Construction Equipment ABInventors: Hea-Gyoon Joung, Sang-Hee Lee, Hung-Ju Shin
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Publication number: 20140230423Abstract: A vehicle drive device for a rotary electric machine. A case of the device includes a support wall portion that extends in a radial direction of the rotary electric machine at a location between the rotary electric machine and the fluid coupling in the axial direction. A first bearing and a second bearing that is separate from the first bearing are disposed at different positions in the radial direction from each other, the first bearing being configured to support the rotor member in the radial direction so as to be rotatable with respect to the support wall portion, and the second bearing being configured to support the coupling input member in the radial direction so as to be rotatable with respect to the support wall portion.Type: ApplicationFiled: October 31, 2012Publication date: August 21, 2014Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mikio Iwase, Daiki Suyama, Naoya Jinnai, Tatsuya Okishima, Yukihiko Ideshio, Yuji Inoue
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Publication number: 20140190157Abstract: A drive train (1) has an internal combustion engine (2), a traction drive (3), and working hydraulics (4) having at least one hydraulic pump (7). A connecting line (26) leads to a hydraulic accumulator (25) and is connected to a delivery line (10) of the hydraulic pump (7) that leads to the working hydraulics (4). A shutoff valve (30) is located in the connecting line (26). The shutoff valve (30) is a check valve (31) that opens automatically and as a function of the pressure to allow a flow to the hydraulic accumulator (25). A pressure relief valve (32) is operatively associated with the connecting line (26) between the shutoff valve (30) and the hydraulic accumulator (25).Type: ApplicationFiled: November 18, 2013Publication date: July 10, 2014Applicant: Linde Hydraulics GmbH & Co. KGInventors: Lukas Krittian, Martin Steigerwald, Martin Oberhausser, Alfred Langen
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Patent number: 8769945Abstract: A pump displacement control cylinder is configured to control the displacement of a hydraulic pump according to pressure of hydraulic fluid and switches the discharge direction of the hydraulic fluid from the hydraulic pump according to the supply direction of the hydraulic fluid to the pump displacement control cylinder. A forward and backward progression switching valve is configured to switch the supply direction of the hydraulic fluid to the pump displacement control cylinder. A pressure control valve is configured to control the pressure of the hydraulic fluid supplied to the pump displacement control cylinder according to a command value input to the pressure control valve. A control section is configured to execute pump shuttle control which reduces the command value to the pressure control valve when switching between forward and backward progression using a forward and backward progression operation member.Type: GrantFiled: September 4, 2012Date of Patent: July 8, 2014Assignee: Komatsu Ltd.Inventors: Atsushi Shirao, Takahisa Oasa, Shinichi Kitao
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Publication number: 20140174063Abstract: A hydraulic system includes a cylinder assembly with a rod, a pressurized fluid source, a fluid tank, and a control valve. The control valve is fluidly connected to the cylinder assembly. The hydraulic system also includes a line relief, first makeup valve, and second makeup valve fluidly connected to a head end of the cylinder assembly. The second makeup valve is configured to provide fluid flow to the head end of the cylinder assembly when the rod is urged toward an extended position and the control valve is in a neutral position.Type: ApplicationFiled: December 20, 2012Publication date: June 26, 2014Applicant: Caterpillar Inc.Inventor: Magomed Gabibulayev
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Patent number: 8746420Abstract: Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve having four orifices, a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, and a fourth orifice connected to the accumulation circuit. The cut-in-cut-out valve alternates between two positions as a function of the pressure in the accumulation circuit, a cut-in position in which the first, second and fourth orifices are connected to each other, and a cut-out position in which the first and fourth orifices are closed.Type: GrantFiled: September 12, 2011Date of Patent: June 10, 2014Assignee: Poclain Hydraulics IndustrieInventor: Dominique P Costaz
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Patent number: 8739906Abstract: A hybrid-type construction machine includes a controller configured to control a revolution speed of an engine; a hydraulic pump configured to be driven by the engine; a motor generator configured to assist the engine; and a hydraulic circuit configured to supply an operating oil discharged from the hydraulic pump to a hydraulic load, wherein when the controller determines that the hydraulic circuit is in an excessive output state, the controller controls the revolution speed of the engine so as to be lower than an ordinary revolution speed of the engine while controlling the motor generator to generate electricity.Type: GrantFiled: June 15, 2010Date of Patent: June 3, 2014Assignee: Sumitomo Heavy Industries, Ltd.Inventor: Koji Kawashima
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Patent number: 8738241Abstract: A machine having a pump overspeed protection system operating thereon includes an internal combustion engine, a plurality of ground engaging elements, and a drivetrain coupling the internal combustion engine and the ground engaging elements. The drivetrain includes a torque converter having a locked configuration and an unlocked configuration. The machine also includes a plurality of pumps driven by the internal combustion engine. An electronic control is in communication with the internal combustion engine, the torque converter, and the plurality of pumps.Type: GrantFiled: May 31, 2011Date of Patent: May 27, 2014Assignee: Caterpillar Inc.Inventors: Michael Evan Hague, Sameer Marathe, Zhiyong Wei, Matthew Stephen Marquette
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Publication number: 20140137329Abstract: A support device for persons, such as a bed, treatment or operating table, chair, comprises: a frame; a first and a second movable member, which movable members can be adjusted independently of one another and which are designed to support the person or one or more parts of the person in various positions, and a hydraulic system for adjusting the movable members, the hydraulic system comprising: a reservoir for hydraulic liquid; a first and a second hydraulic actuator associated with the first and second movable member, respectively, which hydraulic actuators can each be moved in two directions; a hydraulic pump; a pump activating member which is operatively connected to the pump in order for an operator to activate the pump; a valve assembly which is provided in the hydraulic circuit between the pump and the respective actuators, and a valve assembly operating member which can be mechanically operated by an operator and is mechanically connected to the valve assembly for selecting and providing a connectionType: ApplicationFiled: January 13, 2014Publication date: May 22, 2014Inventor: Jan Albertus Beumer
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Patent number: 8726649Abstract: A controller includes a storage unit that stores a map in which an operation amount and an upper limit value of suction torque of a hydraulic pump are associated with each other, for each operation content identified by a cylinder that is an operation object out of the cylinders, and by a direction of operation performed on this cylinder; an operation torque determination unit that determines the upper limit value of suction torque for each cylinder by using the map stored in the storage unit when an actuation command relating to at least one cylinder is input by an operation lever; a high-level selection unit that selects the maximum upper limit value of suction torque out of the upper limit values of suction torque determined by the operation torque determination unit; and a regulator that regulates a displacement of the hydraulic pump so as to obtain torque equal to or lower than the suction torque selected by the high-level selection unit.Type: GrantFiled: May 26, 2010Date of Patent: May 20, 2014Assignees: Kabushiki Kaisha (Kobe Steel, Ltd.), Kobelco Construction Machinery Co., Ltd.Inventors: Takao Nanjo, Saburo Senoo, Mitsunori Hirozawa
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Publication number: 20140123639Abstract: A hydraulic driving system includes a hydraulic cylinder with a cylinder tube and a cylinder rod, a main pump, a hydraulic-fluid path, a charge pump, a stroke position detecting unit, and a pump control unit. The hydraulic-fluid path forms a closed circuit between a main pump and the hydraulic cylinder. The cylinder rod expands or contracts depending on how hydraulic fluid is supplied and exhausted to and from first and second chambers. The charge pump replenishes hydraulic-fluid in the hydraulic-fluid path. The pump control unit performs flow-rate reduction control in which the pump control unit reduces a suction flow rate so that a suction flow rate of the main pump is equal to or less than a maximum discharge flow rate of the charge pump when the stroke position becomes closer to a stroke end of the cylinder rod than a prescribed reference position during the flow rate reduction control.Type: ApplicationFiled: August 13, 2012Publication date: May 8, 2014Applicant: KOMATSU LTD.Inventors: Teruo Akiyama, Noboru Iida, Kenji Oshima, Koji Saito
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Patent number: 8707690Abstract: A hydraulic pump controlling apparatus of a construction machine according to the present disclosure includes: a hydraulic pump in which a swash plate angle is controlled to control a discharge flow; an auxiliary pump; a control valve controlling a flowing direction of a fluid discharged from the hydraulic pump and selectively supplying the fluid to an actuator; an orifice and a relief valve connected between a center bypass line of the control valve and a tank T to be parallel to each other; signal pressure selecting units receiving a fluid passing through the center bypass line of the control valve and a fluid discharged from the auxiliary pump, and selecting the pressure of any one of the fluids as a signal pressure; and a regulator receiving the signal pressure selected from the signal pressure selecting units to control the swash plate angle of the hydraulic pump, and the signal pressure selecting unit selects the pressure of the fluid discharged from the auxiliary pump as the signal pressure and transfeType: GrantFiled: December 23, 2009Date of Patent: April 29, 2014Assignee: Doosan Infracore Co., Ltd.Inventors: Young Sik Cho, Dal Sik Jang
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Publication number: 20140109565Abstract: [Problem] To more smoothly commence actuation of a stroke simulation function. [Means for Resolution] A pedal feel simulator unit 3 of a master cylinder 1 has a start-up load reducing unit 28, and this start-up load reducing unit 28 has a start-up load reducing spring 29. The elastic modulus of the start-up load reducing spring 29 is set smaller than the elastic modulus of a simulator actuation piston return spring 16. Consequently, when the start-up load reducing spring 29 is pressed by an input shaft 4, the start-up load reducing spring 29 starts to elastically flex before the simulator actuation piston return spring 16 elastically flexes and a simulator actuation piston 14 starts to move forward. Because of this, the start-up load of the pedal feel simulator unit 3 is reduced.Type: ApplicationFiled: May 14, 2012Publication date: April 24, 2014Applicant: ROBERT BOSCH GMBHInventors: Shuusaku Chiba, Naoshi Uchida
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Publication number: 20140109567Abstract: A hydraulic converter for a hydraulic brake system or clutch system, in particular, of a handlebar-steered vehicle, in particular of a bicycle, includes at least one hydraulic master device and a mechanical slave device for actuating the hydraulic master device. The hydraulic master device comprises a cylinder with a pressure chamber, a piston arranged in the cylinder displaceably along the axis of the cylinder, and the hydraulic converter having an adjustment device for adjusting the volume of the pressure chamber of the cylinder.Type: ApplicationFiled: December 27, 2013Publication date: April 24, 2014Applicant: Gustav Magenwirth GmbH & Co., KGInventors: Joachim Hujer, Jochen Coconcelli
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Publication number: 20140069092Abstract: A hydraulic pump control circuit may include a pressure reducing valve selectively operable to limit the amount of fluid pressure available to an actuator operably coupled to a pump displacement volume adjusting mechanism of a variable displacement pump. The pump may be hydraulically coupled to a motor configured to provide a torque output. The reduced pressure to the actuator limits actuator travel, thereby limiting pump displacement. Accordingly, torque output of the motor may be reduced, thereby improving traction control.Type: ApplicationFiled: September 7, 2012Publication date: March 13, 2014Applicant: CATERPILLAR, INC.Inventors: Christopher Mark Elliott, William Christopher Swick, Jeremy T. Peterson, Paul A. Dvorak
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Publication number: 20140069091Abstract: Electro-hydraulic systems (10, 110, 210, 310, 410, 510, 610 and 710) control multiple hydraulic motors without objectionable erratic or jerky motion. The system (10) includes a variable displacement pump (20), an electronic controller (30), a direction control valve (40), first and second pump outlet valves (60) and (70), and a fluid reservoir (80). The pump (20) does not require or use a load feedback signal to control pump output. The controller (30) provides electric control signals to a pump control (21) and to individual hydraulic motors (51). A load sense circuit (46) resolves a highest load sense pressure Ps, which is communicated to the first and second pump outlet valves (60) and (70). The first pump outlet valve (60) limits the maximum load sense pressure. The second pump outlet valve (70) limits the maximum pressure differential between the pump outlet and the load sense pressure.Type: ApplicationFiled: March 5, 2012Publication date: March 13, 2014Applicant: Parker Hannifin CorporationInventors: Germano Franzoni, Jarmo Harsia, Roger Lowman
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Publication number: 20140060248Abstract: Disclosed are power machines, and drive systems for use thereon, as well as methods of controlling the displacement of a hydraulic drive motor. The drive system includes a drive pump capable of providing a hydraulic power output and a drive motor operably coupled to the drive pump that receives the hydraulic power output from the drive pump. The drive motor has an operating displacement that is variable between a minimum displacement and a maximum displacement and it provides a rotational output member. A shift actuator is operably coupled to the drive motor and it is configured to vary the displacement of the drive motor between the minimum displacement and the maximum displacement. A controller controls the shift actuator to cause the drive motor to provide infinitely variable displacement between the minimum and maximum displacements.Type: ApplicationFiled: December 27, 2012Publication date: March 6, 2014Applicant: Clark Equipment CompanyInventor: Matthew J. Kaldor
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Publication number: 20140060020Abstract: A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure.Type: ApplicationFiled: December 13, 2012Publication date: March 6, 2014Applicant: CATERPILLAR INC.Inventors: Randal N. PETERSON, Aleksandar M. EGELJA, Rustu CESUR
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Patent number: 8660761Abstract: A method is provided for controlling a gear ratio change in a hydrostatic drive machine. The hydrostatic drive machine includes a variable displacement pump and at least one variable displacement motor fluidly connected with the variable displacement pump. The method includes a step of determining a gear ratio rate of change corresponding to a change from a current gear ratio to a new gear ratio. Start and stop overlap gear ratios corresponding to the gear ratio rate are determined and define an overlap range. The current gear ratio is changed to the new gear ratio using electronic signals at least in part by simultaneously changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios within the overlap range, and sequentially changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios outside the overlap range.Type: GrantFiled: November 23, 2011Date of Patent: February 25, 2014Assignee: Caterpillar Inc.Inventors: Randall Todd Anderson, Bradley John Will
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Publication number: 20130318971Abstract: A controller carries out horsepower control to determine a flow rate of a hydraulic pump based on first characteristics and second characteristics, which each define a maximum input setting of the hydraulic pump by a discharge pressure of the hydraulic pump and a flow rate of the hydraulic pump, and based on the discharge pressure. When the discharge pressure is less than a set pressure and when a state where the discharge pressure is equal to or greater than the set pressure has not continued for a set time period, then the controller determines the flow rate based on the first characteristics, and when the state where the discharge pressure is equal to or greater than the set pressure has continued for the set time period, then the controller determines the flow rate based on the second characteristics.Type: ApplicationFiled: February 9, 2012Publication date: December 5, 2013Applicant: Kobelco Construction Machinery Co., Ltd.Inventor: Toshio Sora
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Publication number: 20130312400Abstract: A variable displacement pump includes: a rotor mounted in a body; a cam ring mounted radially outside of the rotor, and arranged to move with a change in an eccentricity of the cam ring with respect to the rotor, wherein change of the eccentricity causes a change in a specific discharge rate; and an electromagnetic actuator arranged to actuate the cam ring for regulating the eccentricity. During control of operation of the electromagnetic actuator, a first response is set slower than a second response, wherein the first response is a response of movement of the cam ring to a change of an input signal in a direction to request a decrease in the specific discharge rate, and the second response is a response of movement of the cam ring to a change of the input signal in a direction to request an increase in the specific discharge rate.Type: ApplicationFiled: July 31, 2013Publication date: November 28, 2013Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Makoto KIMURA, Makoto TADA, Satoshi NONAKA, Hiroyoshi GOMI
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Patent number: 8578709Abstract: In an over-loading prevention device including a hydraulic pump, a control valve, and a control lever, a discharge-quantity control unit performs constant-torque control which decreases a discharge quantity in proportion to an increase in a discharge pressure in the pump to control an input torque of the pump uniformly. An operation-state detection unit detects an actuation state of the control lever. A control unit outputs a control signal that sets the pump input torque to a minimum torque according to the constant-torque control, to the discharge-quantity control unit when the control lever is operated over a predetermined speed, and subsequently changes a level of the control signal to a maximum torque according to the constant-torque control in accordance with a predetermined control pattern to raise the pump input torque.Type: GrantFiled: April 27, 2007Date of Patent: November 12, 2013Assignee: Sumitomo (S.H.I.) Construction Machinery Co., Ltd.Inventors: Hiroyuki Tsukamoto, Takashi Nishi
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Patent number: 8573111Abstract: A load sense connection is provided between the implement rockshaft cylinders and the load-sensed power source. However, to avoid tractor starting difficulty, a valve structure is provided in the power beyond fluid line to keep the fluid line closed when starting the tractor. This valve structure provides a hydraulic latching function that allows the load-sensed power source to be activated and deactivated depending on the SCV function. The load-sensed power source is activated when the rockshaft cylinder(s) is fully extended and remains activated or latched when the SCV is returned to neutral. The load-sensed power source is deactivated or unlatched when the rockshaft cylinder is retracted.Type: GrantFiled: April 19, 2010Date of Patent: November 5, 2013Assignee: Deere & CompanyInventors: William Douglas Graham, Aaron L. Barfels
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Patent number: 8555628Abstract: A variable displacement pump including a drive shaft, a cam ring eccentrically moveable with respect to an axis of the drive shaft, and a solenoid drivingly controlled on the basis of variation in electric current amount to be supplied to the solenoid which is controlled in accordance with an operating condition of a vehicle. The solenoid is configured such that a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is smaller is reduced as compared to a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is larger.Type: GrantFiled: November 10, 2009Date of Patent: October 15, 2013Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shigeaki Yamamuro, Makoto Tada, Satoshi Nonaka
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Patent number: 8548705Abstract: A method for controlling an automated clutch, which comprises a hydraulic clutch actuating system having a hydrostatic actuator, the pressure of which is detected. The method includes using the pressure of the hydrostatic actuator to adapt the characteristic curve of the clutch.Type: GrantFiled: October 1, 2012Date of Patent: October 1, 2013Assignee: Schaeffler Technologies AG & Co. KGInventors: Juergen Eich, Markus Baehr
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Patent number: 8540048Abstract: A system for controlling a transmission including a fluid pump and a fluid motor operably coupled to one another in a fluid circuit is disclosed. The system includes a controller configured to receive signals indicative of operator inputs, and determine a variable pressure limit in the fluid circuit based on the signals indicative of operator inputs. The controller is further configured to control displacement of at least one of the fluid pump and the fluid motor based on the variable pressure limit, such that a pressure level in the fluid circuit is maintained below the variable pressure limit.Type: GrantFiled: December 28, 2011Date of Patent: September 24, 2013Assignee: Caterpillar Inc.Inventors: Bradley J. Will, Randall T. Anderson
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Patent number: 8522543Abstract: The present disclosure is directed toward a hydraulic control system. The system may have a pump and a tool actuator configured to move a tool with a flow of pressurized fluid provided by the pump. The system may further have a tool control valve configured to control the flow of pressurized fluid to the tool actuator. The system may also have a controller operably connected with the tool control valve and the pump. The controller may be configured to receive a tool movement request. The controller may further be configured to estimate a change in a flow demand across the tool control valve associated with the tool movement request. The controller may also be configured to command adjustment of a discharge flow rate of the pump based on the estimated change in flow demand to satisfy the tool movement request.Type: GrantFiled: December 15, 2009Date of Patent: September 3, 2013Assignee: Caterpillar Inc.Inventors: Andrew J. Krajnik, Patrick W. Sullivan, Jr.
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Patent number: 8522542Abstract: A variable displacement pump includes: a rotor mounted in a body; a cam ring mounted radially outside of the rotor, and arranged to move with a change in an eccentricity of the cam ring with respect to the rotor, wherein change of the eccentricity causes a change in a specific discharge rate; and an electromagnetic actuator arranged to actuate the cam ring for regulating the eccentricity. During control of operation of the electromagnetic actuator, a first response is set slower than a second response, wherein the first response is a response of movement of the cam ring to a change of an input signal in a direction to request a decrease in the specific discharge rate, and the second response is a response of movement of the cam ring to a change of the input signal in a direction to request an increase in the specific discharge rate.Type: GrantFiled: August 11, 2009Date of Patent: September 3, 2013Assignee: Hitachi Automotive Systems, Ltd.Inventors: Makoto Kimura, Makoto Tada, Satoshi Nonaka, Hiroyoshi Gomi
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Patent number: 8495870Abstract: Disclosed is a work machine having a traveling apparatus and a work implement driven by an engine. A hydraulic system mounted on the work machine includes an HST pump comprising a swash plate, variable displacement pump driven by the engine, an HST motor connected in a closed circuit to the HST pump and a pair of speed-changing oil passageways, the HST motor being driven by an amount of oil supplied by the HST pump, thereby to drive the traveling apparatus, a main pump driven by the engine, the main pump supplying pressure oil to the work implement, a pilot pump driven by the engine, a swash plate positioning circuit configured to effect positioning of a swash plate of the HST pump with pilot oil supplied from the pilot pump, and a bleed circuit configured to drain, via a throttle, a portion of the pilot oil supplied to the swash plate positioning circuit.Type: GrantFiled: March 16, 2010Date of Patent: July 30, 2013Assignee: Kubota CorporationInventors: Ryohei Sumiyoshi, Kazuyoshi Arii, Kunihiro Suzuki
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Publication number: 20130180236Abstract: The invention provides a device for extracting energy from a liquid flow. The device has a housing with one or more entry ports through which liquid flow can enter the housing and a plurality of exit ports through which liquid flow can leave the housing. An air compression chamber is provided along with a plurality of valve members which are operable to regulate flow of the liquid through the plurality of exit ports. The exit ports are arranged in an array inclined in the direction of liquid flow and the valve members are operable to close the exit ports downstream of the liquid flow consecutively as the liquid flow is incident thereon, thereby progressively diverting flow of the liquid towards the air compression chamber and compressing air therein, and to open the exit ports on a return flow of liquid from the air compression chamber.Type: ApplicationFiled: January 18, 2013Publication date: July 18, 2013Inventor: Derek James Wallace McMinn
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Publication number: 20130167518Abstract: A control arrangement for supplying pressure medium to a plurality of consumers. A supply metering orifice and an individual pressure compensator are associated with each consumer of the plurality of consumers. The individual pressure compensator is adjusted via a central control unit.Type: ApplicationFiled: June 29, 2012Publication date: July 4, 2013Applicant: Robert Bosch GmbHInventors: Thomas Weickert, Uwe Neumann, Jan Amrhein
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Patent number: 8474254Abstract: A system and method for performing a floating function in an earthmoving implement of an earthmoving machine without physically connecting chambers within a hydraulic actuator that is adapted to raise and lower the earthmoving implement. The system includes a device for delivering a pressurized fluid to and receiving pressurized fluid from the actuator, a valve for compensating for differences in volume between chambers of the actuator, and an electronic control circuit that includes electronic sensors for sensing the pressures in the chambers of the actuator, and a controller for receiving outputs of the sensors. The controller calculates an amount of the pressurized fluid that, when delivered to or received from the actuator, achieves a substantially constant pressures in the chambers of the actuator and enables the earthmoving implement to float regardless of motion of the actuator.Type: GrantFiled: November 5, 2009Date of Patent: July 2, 2013Assignee: Purdue Research FoundationInventors: Edward C. Hughes, IV, Christopher Alan Williamson, Joshua D. Zimmerman, Monika Marianne Ivantysynova
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Patent number: 8468816Abstract: In a hybrid working machine in which the maximum engine output is set at the average power and the maximum pump input is set to be larger than the maximum engine output in a normal state, in an abnormal state in which the level of charge of a battery decreases and assistance ability of a motor function of a power machine is lost, the minimum pump flow rate is reduced to a value equal to or smaller than a standby flow rate, the standby flow rate being the minimum pump flow rate used in normal state control, and a set value of the maximum pump input is changed such that the maximum pump input is smaller than the maximum engine output.Type: GrantFiled: December 17, 2009Date of Patent: June 25, 2013Assignee: Kobelco Construction Machinery Co., Ltd.Inventor: Toshio Sora
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Publication number: 20130133319Abstract: A drive system for propelling a power machine over a support surface is disclosed. The drive system includes a hydraulic pressure source and a drive assembly. The drive assembly has a hydraulic motor in fluid communication with the hydraulic pressure source that is switchable between first and second displacement arrangements. A shift valve receives pressurized fluid from the hydraulic pressure source and provides a shift signal to the hydraulic motor to selectively cause the displacement of the hydraulic motor to shift between the first and second displacement arrangements. A sensing device capable of generating a load signal indicative of a load condition provided by the drive assembly is also provided. An electronic controller provides a control signal to the shift valve to control the displacement of the hydraulic motor in response at least in part due to the load signal.Type: ApplicationFiled: March 2, 2012Publication date: May 30, 2013Applicant: CLARK EQUIPMENT COMPANYInventors: Patrick P. Lacher, Daniel J. Krieger, Gunter G. Matt
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Publication number: 20130125537Abstract: A swing flow control system for a construction machine is provided, which includes an engine; a plurality of actuators for working devices; a variable displacement hydraulic pump providing hydraulic pressure to the actuators for the working devices and the swing motor; an operation portion including an operation lever or a joystick and instructing movement of the plurality of actuators; a control valve supplying a flow rate of the hydraulic pump to the actuators and the swing motor by the operation portion; a working device position detection means, installed on one side of the actuator; an operation amount sensing means, connected to one side of the operation portion; and a flow controller including a flow setting unit and an output means for providing a control signal to a swash plate control device to receive a signal sensed by the operation amount sensing means.Type: ApplicationFiled: July 30, 2010Publication date: May 23, 2013Applicant: VOLVO CONSTRUCTION EQUIPMENT ABInventor: Dong-Soo Kim
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Publication number: 20130131937Abstract: A method is provided for controlling a gear ratio change in a hydrostatic drive machine. The hydrostatic drive machine includes a variable displacement pump and at least one variable displacement motor fluidly connected with the variable displacement pump. The method includes a step of determining a gear ratio rate of change corresponding to a change from a current gear ratio to a new gear ratio. Start and stop overlap gear ratios corresponding to the gear ratio rate are determined and define an overlap range. The current gear ratio is changed to the new gear ratio using electronic signals at least in part by simultaneously changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios within the overlap range, and sequentially changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios outside the overlap range.Type: ApplicationFiled: November 23, 2011Publication date: May 23, 2013Applicant: CATERPILLAR INC.Inventors: Randall Todd Anderson, Bradley John Will
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Publication number: 20130098025Abstract: A control circuit for a coiled tubing injector includes a circuit controller (14). One or more counterbalance vales (3) may be responsive to the circuit controller to prevent the tubing string from descending into the wellbore during rate of penetration movement. In one embodiment, a control valve (4) allows fluid to flow through a bypass line around the counterbalance valves when drilling in a weight-on-bit mode. Other hydraulic control circuits allow for the release of fluid pressure to control the injector hydraulic motor. In yet another embodiment, the control circuit regulates power to an electric motor of the injector.Type: ApplicationFiled: November 6, 2012Publication date: April 25, 2013Applicant: Xtreme Drilling and Coil Services Corp.Inventor: Xtreme Drilling and Coil Services Corp.
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Publication number: 20130091833Abstract: A hydraulic control system and a hydraulic control method are disclosed. The hydraulic control system comprises a first closed pump (P1) and a first engine (M1) connected with each other, a second closed pump (P2) and a second engine (M2) connected with each other, and a hydraulic motor (P3). The first closed pump (P1), the second closed pump (P2) and the hydraulic motor (P3) are connected in parallel. Compared with the prior art, the present hydraulic control system has advantages of wider engine model selection range, higher reliability and better micro-motion performance.Type: ApplicationFiled: April 11, 2011Publication date: April 18, 2013Applicants: HUNAN ZOOMLION SPECIAL VEHICLE CO., LTD, ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY CO. LTD.Inventors: Chunxin Zhan, Quan Liu, Yuan Zhang, Chunyang Song, Shaojun Wang, Zhihua Yuan
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Patent number: 8423247Abstract: A speed change control system for industrial vehicle, includes: a speed ratio detecting unit that detects a speed ratio of speeds of an input shaft and of an output shaft of a torque converter; speed changer for operating based on the torque converter speed ratio that shifts up or down a speed stage of a transmission in response to the detected speed ratio; a braking detection unit that detects an operation of a braking device for traveling; and a downshift limit unit that permits a downshift to a 1st speed by the speed changer when a non-operation of the braking device is detected by the braking detection unit and limits a lowest speed stage upon downshift by the speed changer to a 2nd speed when an operation of the braking device is detected.Type: GrantFiled: November 30, 2007Date of Patent: April 16, 2013Assignee: Hitachi Construction Machinery, Co., Ltd.Inventors: Koji Hyodo, Tetsuji Tanaka, Eiichi Sakai
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Patent number: 8418798Abstract: In a work vehicle, a controller controls the displacement of a hydraulic motor by electronically controlling a motor displacement control part. When an inching operation member is being operated, the controller performs inching control for setting the minimum displacement of the hydraulic motor to a greater value in correspondence with a lower pilot pressure detected by a pilot pressure detector.Type: GrantFiled: September 1, 2010Date of Patent: April 16, 2013Assignee: Komatsu Ltd.Inventors: Takuya Mori, Hirotaka Takahashi, Toru Shiina, Masanori Ikari, Atsushi Shirao
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Patent number: 8374755Abstract: A control system for a machine is disclosed. The control system may have a power source, an operator input device configured to generate a first signal indicative of a desired mode of power source operation, and a work implement driven by the power source. The control system may also have a controller in communication with the power source and the operator input device. The controller may be configured to classify a currently performed work implement task and select an output map based on the classification of the currently performed work implement task and the first signal. The controller may further be configured to control the power source operation using the output map.Type: GrantFiled: July 31, 2007Date of Patent: February 12, 2013Assignee: Caterpillar Inc.Inventors: Hong-Chin Lin, Yun-Ren Ho, Lucas Adam Knapp
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Patent number: 8336305Abstract: A hydraulic drive device capable of utilizing return oil effectively while maintaining a driven speed of a hydraulic actuator, as well as a working machine having the hydraulic drive device, are provided. The hydraulic drive device includes a controller. During an external force applying period in which a return oil pressure exceeds a discharge pressure from a hydraulic pump, the controller specifies a regenerating flow rate capable of being conducted to a regeneration oil passage and a surplus flow rate other than the regenerating flow rate on the basis of power required of the hydraulic pump out of return oil other than return oil which is conduced to a tank through a control valve, then conducts the return oil of the regenerating flow rate to the regeneration oil passage and controls an MO valve and a regulator so that the return oil of the surplus flow rate is conducted to an outlet oil passage.Type: GrantFiled: November 26, 2007Date of Patent: December 25, 2012Assignee: Kobelco Construction Machinery Co., Ltd.Inventors: Yuuji Matsuura, Naoki Sugano, Takao Nanjo, Hiroshi Togo, Hidekazu Oka
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Publication number: 20120317964Abstract: A closed hydrostatic circuit with variable charge and variable flushing systems is disclosed. A variable displacement charge pump is configured to supply charge fluid and pilot control fluid to the hydrostatic circuit. An electronically controlled pressure regulating valve is in communication with an output of the charge pump and is linked to a controller. When the hydrostatic control system detects a high hydraulic temperature condition, the electronically controlled pressure regulating valve, that is in communication with an output of the charge pump and that is linked to a controller, increases the charge pump flow. A bidirectional variable displacement hydrostatic motor is connected in parallel to two input/output lines. A flush valve is in communication with the hydrostatic motor and both input/output lines. The flush valve and hydrostatic motor are both in communication with the flush orifice and a flush relief valve.Type: ApplicationFiled: June 16, 2011Publication date: December 20, 2012Applicant: CATERPILLAR, INC.Inventors: Christopher J. Demick, Paul A. Dvorak, William Christopher Swick, Vincent Guyard, Christopher Mark Elliott, Christopher Pruess
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Patent number: 8327638Abstract: The object of the present invention is to allow an operator to easily perform desired operations with high hydraulic efficiency, without an increase in difficulty of performing operations. A hydraulic drive apparatus of the present invention includes a pump control unit 31 that includes: a pump reference command value setting unit 31a that sets a pump reference command value for a hydraulic pump 10 in accordance with the engine speed of an engine 3; a pump correction command value calculating unit 31b that sets a pump command value by determining an inching rate in accordance with the amount of operation when an inching operation is performed, and correcting the pump reference command value in accordance with the inching rate; and a pump control command value setting unit 31c that sets a pump control command value for controlling the capacity of the hydraulic pump 10, based on the pump command value set by the pump correction command value calculating unit 31b.Type: GrantFiled: January 9, 2008Date of Patent: December 11, 2012Assignee: Komatsu Ltd.Inventor: Naritoshi Ohtsukasa
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Patent number: 8322997Abstract: The invention relates to an eccentric pump including a frame, a pump shaft which can be driven using a driving device and is mounted to be rotatable about a main axis that is stationary relative to the frame, an eccentric sleeve which is mounted in an axially movable manner on a pump shaft section, an anti-rotation element which is effective between the pump shaft section and the eccentric sleeve), several pump elements which are stationary relative to the frame and are provided with displacement elements that can be moved in a radial direction relative to the main axis, act upon a fluid contained in swept volumes of the pump elements, and are moved against a fluid pressure by an external surface of the eccentric sleeve, and at least one spring element which acts upon the eccentric sleeve in an axial direction.Type: GrantFiled: June 6, 2008Date of Patent: December 4, 2012Assignee: Weber-Hydraulik GmbHInventors: Johann Auer, Stefan Kopf
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Publication number: 20120285157Abstract: During a swing start, a pump torque calculating section associated with pump delivery pressure, a pump torque calculating section associated with swing operation pressure, and a maximum value selecting section of a controller perform control to change a maximum absorption torque of a second hydraulic pump between Tb and Tc in accordance with a delivery pressure of the second hydraulic pump. In an operation combining swing with other motion, a subtraction section performs a calculation to subtract a maximum absorption torque Tp2 of the second hydraulic pump from a total pump torque Tr0 to thereby distribute an amount of torque reduced in the second hydraulic pump to a first hydraulic pump associated with an actuator other than a swing motor. Further, a required flow rate can be supplied to the swing motor, thus achieving a smooth shift to a constant speed swing.Type: ApplicationFiled: February 2, 2011Publication date: November 15, 2012Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa
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Publication number: 20120279210Abstract: A transmission of a motor vehicle includes: an input shaft and an output shaft; at least one hydraulically operable actuator, hydraulic lubrication and/or oil cooling; a first hydraulic pump which is driven directly or indirectly by the input shaft; and a second hydraulic pump which is driven directly or indirectly by the output shaft.Type: ApplicationFiled: April 27, 2012Publication date: November 8, 2012Inventor: Steffen STRAUSS