Condition Responsive Control Of Pump Or Motor Displacement Patents (Class 60/445)
  • Patent number: 10962031
    Abstract: A control device for at least one hydraulic working section (A, B), which can be connected to a pressure supply source (P) and a return flow (T) via a hydraulic supply circuit and to a control valve (34) supplied with a pilot pressure. The device includes an emergency shutdown system (32) having a pilot solenoid valve (16) and an additional valve (14). Both the hydraulic energy flow from the pressure supply source (P) to at least one of the respective working sections (A, B) and the pilot pressure supply to the control valve (34) can be suppressed by the pilot solenoid valve (16) via the additional valve (14).
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: March 30, 2021
    Assignee: HYDAC SYSTEMS & SERVICES GMBH
    Inventors: Christoph Stoenner, Sascha Alexander Biwersi, Peter Jakobs
  • Patent number: 10787787
    Abstract: A hydraulic system for a working machine, includes an operation member, an operation valve to change an output pressure of an operation fluid in accordance with operation of the operation member, a hydraulic device to be activated by the operation fluid outputted from the operation valve, a first fluid tube coupling the operation valve to the hydraulic device, and a bleed circuit connected to the first fluid tube and configured to output the operation fluid in the first fluid tube. The first fluid tube includes a first section fluid tube arranged in a section between the operation valve and a coupling portion coupling the first fluid tube to the bleed circuit, and a second section fluid tube arranged in a section between the coupling portion and the hydraulic device, the second section fluid tube having an inner diameter different from an inner diameter of the first section fluid tube.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: September 29, 2020
    Assignee: KUBOTA CORPORATION
    Inventors: Daiki Abe, Yuji Fukuda, Yuya Konishi, Keigo Honda, Hiroya Hanano, Jun Tomita
  • Patent number: 10767667
    Abstract: The present invention relates to an electronically controlled valve for a variable displacement pump, a hydraulic pump and a hydraulic pump system with switchable control functions. Multiple control functions of different types of hydraulic pumps can be implemented via one single electronically controlled valve combined with control elements and sensors. The hydraulic pump systems can be easily integrated into the overall application systems for intelligent control.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: September 8, 2020
    Assignee: Danfoss Power Solutions (Zhejiang) Co. Ltd.
    Inventors: Zhimin Guo, Stanislav Smolka, Carsten Fiebing
  • Patent number: 10753410
    Abstract: A fluid arrangement for controlling a transmission of a motor vehicle in a hydraulic circuit is disclosed. The fluid arrangement includes a dual clutch including a first sub-clutch and a second sub-clutch, wherein the first sub-clutch is configured to be actuated via a first reversing pump actuator and the second sub-clutch is configured to be actuated via a second reversing pump actuator. The first and second reversing pump actuators each have a first delivery direction and a second delivery direction for delivering a working fluid in the hydraulic circuit. A first gear ratio mechanism with a variable gear ratio for actuating the dual clutch is configured to be actuated via the first delivery direction of the first and second reversing pump actuators a and a second gear ratio mechanism with a variable gear ratio for actuating a consumer arrangement is configured to be actuated via the second delivery direction.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: August 25, 2020
    Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventors: Marco Grethel, Lászlo Mán, Dominik Herkommer
  • Patent number: 10711874
    Abstract: A transmission for a propulsion system. The propulsion system includes a power unit, a power transfer system, and a propulsion element. The transmission incorporates a summation, a propulsion output, and a power transfer transmission system, which receives power from the power unit and/or the power transfer system of the propulsion system. The power transfer transmission system includes a propulsion output transmission and a summation transmission, where the propulsion output transmission receives power from the summation transmission and directs the power to the propulsion element. The power transfer transmission system provides for transfer of power between the power transfer system and the summation transmission. The power transfer transmission system includes a power transfer shaft and a power transfer coupler and selectively connects the power transfer shaft to a propulsion outlet shaft, such that power is transferred directly from the power transfer system to the propulsion output transmission.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: July 14, 2020
    Assignee: Perkins Engines Company Limited
    Inventor: Igor Strashny
  • Patent number: 10690244
    Abstract: A hydrostatic transmission for a traction drive includes a variable-displacement pump and one or more motors coupled to one another in a closed hydraulic circuit. A braking operation by means of the transmission can be initiated in the traction drive by an electronic control unit if there is a risk of overspeeding of an associated internal combustion engine. The braking operation is initiated if at least two activation thresholds are overshot, of which a first activation threshold is variable whereas the further activation threshold is fixed or variable.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: June 23, 2020
    Assignee: Robert Bosch GmbH
    Inventor: Heiko Witte
  • Patent number: 10648489
    Abstract: A hydraulic system for a work machine includes a tank to store an operation fluid, a hydraulic device to be operated by the operation fluid, a control valve to control the hydraulic device, a first fluid tube connecting the hydraulic device and the control valve, the first fluid tube being to supply the operation fluid from the control valve to the hydraulic device, a second fluid tube branching from the first fluid tube and connected to the tank, a switch valve provided to the second fluid tube, the switch valve being to control a flow rate of the operation fluid, and an oil cooler provided to the second fluid tube between the switch valve and the tank.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: May 12, 2020
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kazuyoshi Arii, Hiroaki Nakagawa
  • Patent number: 10641388
    Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is higher than or equal to the second pressure threshold. The pilot check valve is opened while the pilot pressure is less than the second pressure threshold.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: May 5, 2020
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
  • Patent number: 10619330
    Abstract: The present invention relates to a vertical lift type loader comprising a power transmission arrangement with an engine, a hydraulic power system for powering work hydraulics of the loader and a drivetrain power system for powering locomotion of the loader, both being feedable with power from the engine, the hydraulic power system including a power limiter for limiting the power supply of the engine to the hydraulic power system to different power limit values, a determining device for determining an operational state of the loader, and a controller configured to control the power limiter to limit the power supply of the engine to the hydraulic power system to different power limit values, these power limit values being set depending on the operational state of the loader determined by the determining device.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: April 14, 2020
    Assignee: Guangxi LiuGong Machinery Co., Ltd.
    Inventors: Aaron Becker, Shengqing Yang, Songtao Qie, Hui Shao
  • Patent number: 10526177
    Abstract: The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: January 7, 2020
    Assignee: Eaton Intelligent Power Limited
    Inventors: Vincent Joseph Duray, Jerry Carl Weber
  • Patent number: 10329738
    Abstract: Disclosed are a construction machine such as an excavator having a hydraulic system and a method for controlling the construction machine. The construction machine includes: a hydraulic pump which is operated by a driving source to supply a working fluid; an actuator which operates by being supplied with the working fluid from the hydraulic pump; a spool which controls a flow of the working fluid supplied to the actuator from the hydraulic pump; an operating unit which controls an operation of the actuator; a memory unit which stores at least two operating speed profiles for the actuator; an operating speed selecting unit which selects any one of the at least two operating speed profiles stored in the memory unit; and a control unit which controls a discharge flow rate of the hydraulic pump based on the operating speed profile selected by the operating speed selecting unit.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: June 25, 2019
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventors: Dae Gyun Choi, Ki Yong Kim, Tae Seob Jeong
  • Patent number: 10280949
    Abstract: A travel control device is provided with hydraulic pumps of a variable capacity type that are driven by an engine; hydraulic motors that are driven by discharged oil from the hydraulic pumps; traveling devices that are rotation-driven by the hydraulic motors; a travel operation lever that is operated so as to instruct a traveling operation; a first control valve for generating a charged hydraulic pressure by adjusting the discharged oil from a charge pump and a second control valve for generating a capacity control hydraulic pressure in accordance with the operation of the travel operation lever. The first control valve is designed to pressure-adjust and generate a charged hydraulic pressure in accordance with the rotation speed of the engine, and the hydraulic pump is subjected to a variable capacity control process by a capacity control hydraulic pressure that is pressure-adjusted and generated by the second control valve.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: May 7, 2019
    Assignee: Takeuchi Mfg. Co., Ltd.
    Inventors: Hiroki Kondo, Shumpei Okutani, Takeshi Kakuryu, Takato Takizawa, Tomonori Sato
  • Patent number: 10253874
    Abstract: A hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: April 9, 2019
    Assignee: ALLISON TRANSMISSION, INC.
    Inventors: Charles F. Long, Charles T. Taylor
  • Patent number: 10246942
    Abstract: A hydraulic motor circuit for driving an auger is disclosed. The circuit includes a hydraulic motor that receives oil from an oil supply via a supply line and returns oil to the oil supply via a return line. The circuit further includes a main stage pressure relief valve and a first pilot stage relief valve operable if pressure in the return line exceeds a predetermined value corresponding to an allowable inertia load acting on the motor, opening of the first pilot stage relief valve causing the main stage pressure relief valve to open, allowing flow to be diverted from the return line to the supply line and back to the motor. A control valve is configured to block flow to the first pilot stage relief valve when pressure, in the supply line is greater than pressure in the return line. If pressure in the return line exceeds pressure in the supply line, the control valve shifts open and exposes the first pilot stage relief valve to pressure in the return line.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: April 2, 2019
    Assignee: OILPATH HYDRAULICS PTY LTD
    Inventor: Peter John Driver
  • Patent number: 10087960
    Abstract: A load based pressure and flow control system including a variable displacement hydraulic motor and a flow control valve coupled with a motor inlet. A motor inlet pressure sensor is interposed between the variable displacement hydraulic motor and the flow control valve, the motor inlet pressure sensor configured to measure a motor inlet pressure at the motor inlet. An output sensor is coupled with a motor output of the variable displacement hydraulic motor and configured to measure an output characteristic of the variable displacement hydraulic motor. A displacement and flow controller of the system is configured to change displacement of the variable displacement hydraulic motor according to a pressure difference across the flow control valve between the measured motor inlet pressure and a hydraulic system pressure, and change a flow rate of hydraulic fluid through the flow control valve according to the measured output characteristic of the hydraulic motor.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: October 2, 2018
    Assignee: Raven Industries, Inc.
    Inventor: Jesse Wagers
  • Patent number: 10072396
    Abstract: A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to be switched by a switch signal when any one of a first operation valve and a second operation valve is switched so as to allow a first neutral passage and a second neutral passage to communicate with each other; a neutral cut valve configured to be switched by the switch signal so as to block communication between a tank and one of the first neutral passage and the second neutral passage for the first operation valve or the second operation valve that is not switched; and a discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate thereof when the switch signal is inputted from any one of the first operation valve and the second operation valve.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: September 11, 2018
    Assignee: KYB Corporation
    Inventors: Nobuyoshi Yoshida, Ikuo Inagaki
  • Patent number: 10054119
    Abstract: A hybrid or battery type working machine including a hydraulic pump, an electric motor, an electric storage device, and a control device which controls a pump absorption horsepower maximum value in accordance with an amount of electricity stored in the electric storage device. The control device reduces the pump absorption horsepower maximum value by dividing the pump absorption horsepower maximum value into a plurality of regions having different target flow rates, and reduces the pump absorption horsepower maximum value from an old pump absorption horsepower maximum value corresponding to the pump absorption horsepower maximum value which has not yet been reduced to a new pump absorption horsepower maximum value corresponding to the pump absorption horsepower maximum value which has been reduced, so that temporal differences among the regions can increase in a descending order of a target flow rate.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: August 21, 2018
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Masataka Sasaki, Hidetoshi Satake, Takako Satake
  • Patent number: 10029540
    Abstract: A fluid delivery system for an engine is disclosed. The fluid delivery system comprises a pump, a valve module, a motor, and a displacement control module. The pump is operatively coupled with an engine and is adapted to provide a flow of a fluid. The valve module is provided in fluidic communication with the pump to control the flow of the fluid. The motor is provided in fluidic communication with the valve module to receive the flow of the fluid and generate mechanical power. The displacement control module is provided in fluidic communication with the pump and the valve module and is provided downstream of the pump and upstream of the valve module. The displacement control module controls a displacement of the pump for maintaining a constant flow rate of the fluid from the pump based, at least in part, on an engine speed regardless of compressor load.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: July 24, 2018
    Assignee: Caterpillar Inc.
    Inventor: Douglas W. Seeger
  • Patent number: 9945395
    Abstract: A control device controls a hydraulic cylinder unit having a piston. The device receives a setpoint variable and an actual variable and determines, based on a difference between the setpoint variable and the actual variable, a preliminary manipulated variable for valves of the hydraulic cylinder unit. The setpoint variable and the actual variable relate to a position of the piston or a force applied by the piston. Linearization factors are determined dynamically as a function of the actual position of the piston and working pressures on both sides of the piston and a hydraulic fluid tank/pump. Definitive manipulated variables to control the valves are determined from the preliminary manipulated variable and the linearization factors. With the linearization factors, a ratio of the piston adjustment speed to the difference between the setpoint variable and the actual variable is independent of the actual position of the piston and the working pressures.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: April 17, 2018
    Assignee: PRIMETALS TECHNOLOGIES GERMANY GMBH
    Inventor: Wilfried Tautz
  • Patent number: 9836067
    Abstract: The invention relates to a hydraulic actuator (1) that can be controlled by a main valve (2) and an auxiliary valve (3). Upstream of the main valve device (2) is a main regulator (7), having a P block (9) and an I block (10). Upstream of the auxiliary valve (3) is an auxiliary regulator (8), having a base block (11) and an I block (12). In a normal mode of operation, the auxiliary valve (3) is deactivated. The main regulator is provided with a main setpoint variable (p*) and a corresponding main actual quantity (p) of the hydraulic actuator (1). The main regulator (7) determines a main actuating variable (s) and predefines the main actuating variable (s) in the main valve device (2). In a special mode of operation, the base block (11) of the auxiliary regulator (8) is provided with an auxiliary setpoint variable (a*) and a corresponding auxiliary actual quantity (p) of the hydraulic actuator (1).
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: December 5, 2017
    Assignee: PRIMETALS TECHNOLOGIES GERMANY GMBH
    Inventor: Hans-Joachim Felkl
  • Patent number: 9709076
    Abstract: An operating state determining unit determines whether a hydraulic cylinder is in operation or not in operation. A discharge pressure reducing unit reduces the discharge pressure of a charge pump. A discharge pressure control unit controls the discharge pressure reducing unit when the hydraulic cylinder in not in operation to reduce the discharge pressure of the charge pump to a low pressure lower than a normal pressure. The normal pressure is the discharge pressure of the charge pump when the hydraulic cylinder is in operation. An accumulator is connected to a charge flowpath. A one-way valve is disposed between the accumulator and the charge pump. The one-way valve allows the flow of hydraulic fluid from the charge pump to the accumulator and prohibits the flow of hydraulic fluid from the accumulator to the charge pump.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: July 18, 2017
    Assignee: KOMATSU LTD.
    Inventors: Teruo Akiyama, Noboru Iida, Kenji Oshima, Kenji Sasano
  • Patent number: 9574660
    Abstract: A debris collection vehicle having an enclosed volume for collecting debris and a hydraulic fan drive system for creating vacuum condition in the enclosed volume is disclosed. In one embodiment, the hydraulic fan system includes a closed loop hydraulic circuit, a variable displacement hydraulic pump disposed within the closed loop circuit, and a hydraulic motor disposed within the closed loop circuit. The hydraulic fan drive system can also include an electronic or hydraulically actuated control valve constructed and arranged to adjust the output of the hydraulic motor via a displacement actuator based on pressure in the closed loop hydraulic circuit.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: February 21, 2017
    Assignee: Federal Signal Corporation
    Inventors: Joseph L. Schmidt, John D. Padgett
  • Patent number: 9401670
    Abstract: An electric pump includes a pump body, a sensorless brushless motor, and a control portion controlling the motor to perform a constant current control and a constant voltage control to discharge a necessary discharge amount of an operation fluid from the pump body, the control portion controlling the motor to switch from the constant current control to the constant voltage control at a predetermined temperature of the operation fluid and at a predetermined motor applied voltage. The control portion controls the motor to switch from the constant current control to the constant voltage control at a motor applied voltage which is higher than the predetermined motor applied voltage when a temperature of the operation fluid is lower than the predetermined temperature to discharge the necessary discharge amount of the operation fluid from the pump body.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: July 26, 2016
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventor: Yoshihiko Minato
  • Patent number: 9382925
    Abstract: 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: Grant
    Filed: March 2, 2012
    Date of Patent: July 5, 2016
    Assignee: Clark Equipment Company
    Inventors: Patrick P. Lacher, Daniel J. Krieger, Gunter G. Matt
  • Patent number: 9261084
    Abstract: A hydraulic control arrangement (1) is described having a directional valve (2), a metering pump unit which has at least two metering pumps (3, 4) which are connected hydraulically in parallel and are operable mechanically in parallel, and a shut-off valve (6) in hydraulic connection between two of the at least two metering pumps (3, 4), a pump connection (P) and a tank connection (T) which are connected to said metering pump unit by way of the directional valve (2), and two working connections (L, R) connected to the directional valve (2), a control input (8) of the shut-off valve (6) being connected to the pump connection (P) by means of a control valve. Such a control arrangement should be operated at a high hydraulic pressure and at the same time it should be made sure that the shut-off valve is actuated only when the required high pressure is available.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: February 16, 2016
    Assignee: Danfoss Power Solutions ApS
    Inventors: Morten Hoeck Petersen, Bendt Porskrog, Nils E. Sevelsted
  • Patent number: 9221456
    Abstract: A vehicle power generation mode control method includes initiating a vehicle power generation mode request; determining whether at least one of the following conditions exists: high engine revolutions per minute is allowed; high voltage or amperage draw is allowed; current fuel level supports power generation mode; and carbon monoxide readings are within acceptable limits; denying requests for engagement of a vehicle transmission if at least one of the conditions exists; and allowing or commanding the vehicle power generation mode.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: December 29, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: Robert Wright, Walter Joseph Ortmann
  • Patent number: 9200431
    Abstract: A hydraulic drive system for a construction machine has a travel detection device which detects whether or not the operation mode is a traveling operation and a setting changing device. The setting changing device sets the target differential pressure of load sensing control at an absolute pressure Pa when the operation mode is not a traveling operation, and sets the target differential pressure of the load sensing control at an absolute pressure Pa? rather than the absolute pressure Pa. In this way, in the actuator operation other than traveling, a necessary actuator speed can be obtained and supplied with the necessary maximum flow rate. In addition, during the combined operation, a flow rate in accordance with the opening area ratios of flow control valves can be distributed to actuators different in load pressure from one another; and energy efficiency is enhanced due to less energy loss during traveling operation.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: December 1, 2015
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kazushige Mori, Yasutaka Tsuruga, Kiwamu Takahashi, Yoshifumi Takebayashi
  • Patent number: 9180764
    Abstract: A hydrostatic hybrid drive system for road vehicles includes a pump/motor unit (1) connected to the powertrain of the vehicle, controlled by a control unit (5) in a pump or motor operation, and connected to a high-pressure hydraulic accumulator via a first working line (7). The first working line can be closed by a control valve (45) and connected to a low-pressure hydraulic accumulator via a second working line (9). The high-pressure hydraulic accumulator and low-pressure hydraulic accumulator are formed by a double-piston accumulator (11), in which a high-pressure side and a low-pressure side having respective accumulator pistons (15, 17) are formed in an accumulator housing (13). The fluid chambers (23, 25) of the high-pressure side and the low-pressure side are separated by a central housing part (21) through which the common piston rod for both accumulator pistons (15, 17) extends.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: November 10, 2015
    Assignee: HYDAC TECHNOLOGY GMBH
    Inventors: Frank Bauer, Herbert Baltes, Peter Kloft
  • Patent number: 9133605
    Abstract: A hydraulic system has a variable displacement pump that sends fluid from a tank into a supply conduit from which separate open-center control valves convey the fluid to each one of a plurality of hydraulic actuators. The control valves have open-center orifices connected in series between a bypass node and the tank, thereby forming a bypass passage. Pressure at the bypass node controls displacement of the pump. A valve arrangement is connected between an outlet of the pump and the bypass node and is responsive to an amount of fluid flow through the supply conduit to the plurality of hydraulic functions, wherein as the amount of fluid flow increases, the valve arrangement causes fluid flow to the bypass node to decrease. Thus the pressure at the bypass node varies as a function of the operation of the control valves.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: September 15, 2015
    Assignee: HUSCO International, Inc.
    Inventors: Paul Edward Pomeroy, Robert Jonathan Valenta, Mark Jervis
  • Patent number: 9103095
    Abstract: A controller controls the solenoid-operated variable pressure relief valves that are provided to control, at set pressures that can be electrically commanded, pressure of hydraulic oil fed to an attachment cylinder. The controller is provided with a control logic that is capable of controlling the aforementioned solenoid-operated variable pressure relief valves. The control logic performs the aforementioned calculation by compensating for pressure override characteristics of each solenoid-operated variable pressure relief valve based on input signals related to the set relief pressure for and a relief valve passing flow rate of the solenoid-operated variable pressure relief valve, and outputting to the solenoid-operated variable pressure relief valve command signals related to the adjusted set relief pressure resulting from the compensation of the pressure override characteristics.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: August 11, 2015
    Assignee: Caterpillar SARL
    Inventors: Hiroyasu Nishikawa, Sei Shimahara, Manabu Nakanishi, Masashi Shibata
  • Patent number: 9097216
    Abstract: A fuel vapor purge device includes a canister connected to an internal combustion engine and a fuel tank via a purge passage to adsorb and hold a part of fuel vapor, a switch valve connected to the canister and to an atmosphere, and a pump connected to the switch valve via a pump passage and to the atmosphere via an atmosphere passage. The pump is capable of depressurizing or pressurizing an interior of the fuel tank, and the switch valve switches connection of the canister between with the atmosphere and with the pump. The fuel vapor purge device further includes a seal valve provided in the pump passage to open or close the pump passage depending on a pressure in the atmosphere passage.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: August 4, 2015
    Assignee: DENSO CORPORATION
    Inventors: Tomohiro Itoh, Kosei Takagi, Shigeru Hasegawa
  • Patent number: 9091286
    Abstract: A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a tank, a pump, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank. The hydraulic control system may also have a pressure sensor to generate a first signal indicative of a pressure differential across the control valve, an operator input device to generate a second signal indicative of a desired movement of the actuator, and a controller. The controller may be configured to make a first determination of an opening amount of the control valve based on the second signal, and to make a second determination based on the first signal of whether the opening amount will result in overspeeding of the actuator. The controller may also be configured to reduce the opening amount based on the second determination.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: July 28, 2015
    Assignee: Caterpillar Inc.
    Inventors: Rustu Cesur, Jiao Zhang, Tonglin Shang, Bryan J. Hillman, Peter Spring, Lawrence J. Tognetti, Pengfei Ma
  • Patent number: 9085440
    Abstract: The present disclosure relates to an electronic hydraulic pressure control apparatus and an electronic hydraulic pressure control method using a variable behavior, and more particularly, to an electronic hydraulic pressure control apparatus and an electronic hydraulic pressure control method using a variable behavior which can detect that a user manipulates an electronic joystick of an electronic hydraulic system to positive and negative positions with respect to a neutral point in a preset time period, and vary a behavior (for example, a general behavior or an abrupt operation behavior) according to the detection result, thereby enhancing both comfortableness of an operator and an abrupt operation efficiency in manipulating a construction machine and providing a convenience for an operator.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: July 21, 2015
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Ki Hong Choi
  • Patent number: 9057437
    Abstract: In order to provide a forklift capable of performing an inching control suitable for a specific work and a running operation of the forklift and an inching control method of the forklift, an inching ratio calculating unit calculates an inching ratio, a target engine speed calculating unit calculates a target engine speed, a modulation control unit sets a time constant of the inching ratio in response to a speed difference between the target engine speed and an actual engine speed and outputs a correction inching ratio having the time constant set thereto, a multiplication unit outputs a correction absorption torque obtained by multiplying the correction inching ratio by a target absorption torque, and a HST pump electromagnetic proportional control output current converting unit outputs a current instruction value to a pump capacity setting unit.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: June 16, 2015
    Assignee: Komatsu Ltd.
    Inventor: Shinji Kaneko
  • Patent number: 9051712
    Abstract: A hydraulic system for a working machine is provided in which when heavy load fine speed operation work is performed using hydraulic cylinders as hydraulic actuators, and deterioration of fuel consumption can be prevented by reducing energy loss and improving fine speed operability. A center bypass cutoff valve 41 is disposed downstream of a center bypass line 26, and pressure sensors 42, 43, a controller 44, and a solenoid valve 45 provide control such that, when operating means 16 corresponding to a boom cylinder 5 (specific hydraulic actuator) among a plurality of operating means 18-21 is operated to supply a hydraulic fluid to a cylinder chamber 5a of the boom cylinder 5 in a load retaining side, the center bypass cutoff valve 41 is actuated and a fluid delivery pressure of a first hydraulic pump 2 is increased to be higher than a load pressure of the boom cylinder 5.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: June 9, 2015
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Katsuaki Kodaka, Yuta Nakamura, Hidetoshi Satake
  • Patent number: 9032726
    Abstract: 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: Grant
    Filed: February 9, 2012
    Date of Patent: May 19, 2015
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Toshio Sora
  • Publication number: 20150082780
    Abstract: A drive system for hydraulically driven working mechanisms of a working machine includes an axial piston pump, the pump capacity and flow direction of which is varied by changing the pivot angle of the axial piston pump. The drive system includes a hydraulic motor connected via a line to the axial piston pump and drivably connected to the working mechanisms, a control unit operated to set the pump capacity of the axial piston pump to zero and a control valve arrangement that is actuated by the control unit to actuate a limiting device such that the pivot angle of the axial piston pump can be mechanically set to zero degrees (0°).
    Type: Application
    Filed: September 17, 2014
    Publication date: March 26, 2015
    Inventors: Heinrich Dueckinghaus, Heinrich Schneider, Dirk Schlichting
  • Publication number: 20150074938
    Abstract: A hydraulic fluid flow management system and method includes three subsystems. The first subsystem is an engine mounted hydraulic fluid pump electrically operated flow control proportioning valve combination. The second subsystem is a hydraulic fluid flow distribution manifold assembly. The third subsystem is a computer operated controller and display which governs the operation of the electrically operated flow control proportioning valve combination.
    Type: Application
    Filed: October 30, 2014
    Publication date: March 19, 2015
    Applicant: ALAMO GROUP, INC.
    Inventors: Tracy Day, John Day
  • Publication number: 20150040554
    Abstract: A hydraulic linear actuator system known as the “Dynaco Stepper Pump Hydraulics System” is which is an electrically driven hydraulic pump system made of durable materials for use in an electronically controllable hydraulic system comprised of: (a) an electrically driven stepper motor; (b) a hydraulic pump to pressurize a hydraulic fluid; (c) a means to connect the stepper motor to the hydraulic pump; (d) a pressurized reservoir for a quantity of hydraulic fluid; (e) a means to supply pressurized fluid to a hydraulic actuator; (f) the hydraulic actuator with a means to provide linear motion to an object; (g) the means to provide linear motion to an object; (h) a means to return lowered pressurized fluid to the reservoir. An alternative embodiment is further comprised of a controller with a series of feedback signals.
    Type: Application
    Filed: August 6, 2014
    Publication date: February 12, 2015
    Inventors: Gary L. Smith, Laurens MOLENAAR
  • Publication number: 20150033728
    Abstract: A hydrostatic fan drive is operated with a closed circuit and includes a variable-displacement pump with a swept volume that is configured to be adjusted by an adjustment device. The variable-displacement pump is connected by two working lines to a motor that is coupled fixedly in terms of torque to a fan impeller. The fan drive further includes a feed pressure pump and an adjustment pressure line by which the adjustment device is supplied with adjustment pressure medium. A pressure cut-off valve is connected to the adjustment pressure line. The pressure cut-off valve is configured to limit an adjustment pressure, as a function of a high pressure in the working line acting as high-pressure line, to a value such that a certain value of high pressure is not exceeded. The pressure cut-off valve is configured to exhibit pilot control to regulate a working pressure of the variable-displacement pump.
    Type: Application
    Filed: July 29, 2014
    Publication date: February 5, 2015
    Inventors: Igor Glaz, Steffen Loritz
  • Publication number: 20140373519
    Abstract: A method of controlling a float function of a cylinder 25 having a first side and a second side includes connecting the second side of the cylinder to a reservoir 15; connecting the first side of the cylinder to an output of a pump 20 and to the reservoir; and supplying an amount of flow from a pump less than an amount supplied by the pump under loaded conditions. A three-position directional control valve 30 having a pump port, a reservoir port, a first cylinder port, and a second cylinder port may be provided to effectuate aspects of this method.
    Type: Application
    Filed: January 7, 2013
    Publication date: December 25, 2014
    Inventors: Germano Franzoni, Jarmo Harsia, Roger Lowman
  • Patent number: 8899035
    Abstract: A hydraulic pump driven by an engine, a hydraulic actuator, and a negative control circuit are provided on an open center hydraulic circuit, for guiding the hydraulic pressure in the center bypass to the hydraulic pump, as a negative control pressure. A negative control pressure control device controls the negative control pressure to an arbitrary value is also provided. The pump characteristic of the hydraulic pump is set such that the discharge flow rate is minimized when the negative control pressure in the negative control circuit is equal to or greater than a first predetermined pressure. Furthermore, an idling detection device that detects whether the hydraulic actuator is in a non-operated state or not is provided. The negative control pressure is forcefully controlled to the first predetermined pressure or higher when the non-operating state is detected.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: December 2, 2014
    Assignee: Caterpillar SARL
    Inventors: Hiroyasu Nishikawa, Seiichi Akiyama, Yusuke Shimizu, Atsunobu Doi, Sei Shimahara, Manabu Nakanishi, Masashi Shibata
  • Patent number: 8890352
    Abstract: 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 multiple exit ports through which liquid flow can leave the housing. An air compression chamber is provided along with multiple valve members which are operable to regulate flow of the liquid through the multiple 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 on each exit port, which progressively diverts flow of the liquid towards the air compression chamber and compresses air in the air compression chamber, and to open the exit ports on a return flow of liquid from the air compression chamber.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: November 18, 2014
    Inventor: Derek James Wallace McMinn
  • Patent number: 8880300
    Abstract: An outdoor power equipment unit comprises a self-propelled mower having a hydraulic traction drive system. When engine load exceeds a predetermined percentage of full load, a controller automatically reduces the stroke of a variable displacement pump in the traction drive system to reduce the ground speed of the mower without the operator having to change the position of the traction pedal. This reduces engine load to enhance continued good cutting performance. At any time, the controller can take the same actions to reduce ground speed if an excessively high temperature in a fluid used in a cooling system on the mower is detected, or if excessive loads on the mower decks of the mower are detected, or both.
    Type: Grant
    Filed: September 8, 2012
    Date of Patent: November 4, 2014
    Assignee: The Toro Company
    Inventors: Jesse R. Gamble, Kyle C. Bjorkman, Alexander S. Frick
  • Patent number: 8869520
    Abstract: A load sensing system includes a first assembly of actuators for controlling a first hydraulic function, a pump adapted to supply the actuators with pressurized hydraulic fluid, an electrically controlled valve adapted to control the output pressure of the pump via a hydraulic signal, a first pressure sensor for detecting a load pressure of the first actuator assembly, and a control unit adapted to receive a signal with information about the load pressure detected by the first pressure sensor and to generate a control signal, corresponding to the detected load pressure, to the electrically controlled valve.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: October 28, 2014
    Assignee: Volvo Construction Equipment AB
    Inventors: Bo Vigholm, Andreas Ekvall
  • Publication number: 20140311139
    Abstract: A hydrostatic variable displacement pump (2) has a displacement volume set by an electro-hydraulic control device (10) provided with a safety function. In a fault scenario, the variable displacement pump (2) is set to a neutral position. The electro-hydraulic control device (10) has a single electro-hydraulic setpoint encoder (30) to specify the setpoint of the displacement volume of the variable displacement pump (2) and an electrically actuatable valve device (35) connected in series downstream of the setpoint encoder (30), by which the direction of displacement of the variable displacement pump (2) is controlled and which is provided with the safety function.
    Type: Application
    Filed: February 28, 2014
    Publication date: October 23, 2014
    Applicant: Linde Hydraulics GmbH & Co. KG
    Inventors: Rolf Lasaar, Markus Jung
  • Publication number: 20140290237
    Abstract: 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: Application
    Filed: November 19, 2012
    Publication date: October 2, 2014
    Inventors: Hajime Yoshida, Hajime Ishii, Yoshifumi Takebayashi, Shuuhei Noguchi, Hajime Kurikuma
  • Publication number: 20140260224
    Abstract: 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: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: CLARK EQUIPMENT COMPANY
    Inventors: Jeremy Aaron Harms, Daniel James Krieger
  • Patent number: 8833065
    Abstract: 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: Grant
    Filed: July 2, 2010
    Date of Patent: September 16, 2014
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Haruhiko Kawasaki, Masahiro Egawa
  • Patent number: 8818651
    Abstract: 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: Grant
    Filed: June 28, 2010
    Date of Patent: August 26, 2014
    Assignee: Volvo Construction Equipment AB
    Inventors: Hea-Gyoon Joung, Sang-Hee Lee, Hung-Ju Shin