Independently Actuatable Outputs With Condition Responsive Means Insuring Sufficiency Of Feed Of Motive Fluid Patents (Class 60/422)
  • Patent number: 10392780
    Abstract: Provided is a hydraulic drive device that is provided in a work device and with which it is possible to obtain a high energy-saving effect with a low-cost configuration while being equipped with a plurality of hydraulic actuators. The hydraulic drive device is provided with: first and second actuator groups; closed circuits connected to hydraulic actuators included in the first actuator group; a pump section including closed circuit pumps; open circuits which include a plurality of variable throttle valves for changing the flow rate of working fluid supplied from a hydraulic pump included in the pump section to a hydraulic actuator; and circuit switching sections having a first state in which the closed circuits are opened and the opened circuits are blocked, and a second state in which the closed circuits are blocked and the open circuits are opened.
    Type: Grant
    Filed: September 5, 2016
    Date of Patent: August 27, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Naoki Sugano, Naoto Hori, Satoshi Maekawa
  • Patent number: 10329737
    Abstract: An output command calculating section (40) of an HCU (36) restricts a battery discharge power from an electricity storage device (31) based upon a battery electricity storage rate (SOC) and a current square integrating rate (Risc) of the electricity storage device (31). Thereby, the HCU (36) transfers from a normal mode (NMODE) to a low speed mode (LSMODE) to lower a movement speed of a hydraulic actuator. A monitor display amount calculating section (50) of the HCU (36) calculates a maximum speed reduction rate (DRs) based upon a battery discharge power limit value (Plim0) and an engine output upper limit value (Pemax) from the output command calculating section (40). A monitor device (39) displays a reduction rate of the movement speed of the hydraulic actuator in the low speed mode (LSMODE) based on the maximum speed reduction rate (DRs).
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: June 25, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Masafumi Hita, Shinya Imura, Shinji Nishikawa
  • Patent number: 10287751
    Abstract: A hydraulic drive system for a track device of crawler type has right and left hydraulic track motors. The hydraulic drive system is capable of correcting for skew occurring in the straight line traveling of the track device. A traveling test is conducted upon shipment from a factory. If skew is noted during the test, a plug disposed on the side of a valve opening-side pressure receiving portion of a pressure compensating valve for the track which is lower in speed is removed and, replaced with an adjusting mechanism-mounted plug having an adjusting pin. The pin is operated so as to strengthen a biasing force of a target compensating differential pressure adjusting spring. An opening in the pressure compensating valve is thereby corrected in an opening direction and a flow rate to one of the left and right track motors is thereby adjusted to be equal to the other motor.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: May 14, 2019
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Kazushige Mori, Yasutaka Tsuruga, Kiwamu Takahashi, Yoshifumi Takebayashi
  • Patent number: 10273962
    Abstract: A hydraulic system is provided to selectively and independently route pressurized fluid to one or more operational systems of a machine. The hydraulic system is capable of switching fluid flow in operation from one of the operational systems to another of the operational systems in the event of hydraulic drive power being required by the latter one of the operational systems. The hydraulic system is also configured to continue supplying a nominal amount of fluid to support one or more auxiliary functions, for example, a lubrication system for bearings associated with the former one of the operational systems while routing the pressurized fluid to the latter one of the operational systems. A recirculation and anti-cavitation arrangement is also provided to allow recirculation of fluid to a hydraulic motor in the former one of the operational systems when pressurized fluid is being routed to the latter one of the operational systems.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: April 30, 2019
    Assignee: Caterpillar Inc.
    Inventors: Edward William Mate, Michael D. Hudson
  • Patent number: 10260531
    Abstract: A hydraulic drive system includes control valve and operating devices, a variable displacement pump, and a flow regulator. When an operating lever inclination angle becomes a value, a control valve opening area becomes a reference. When the operating lever inclination angle maximizes, the opening area maximizes. The flow regulator: until the operating lever inclination angle becomes the value, increases the pump discharge flow rate with the inclination angle, so a differential pressure between pump discharge and actuator load pressures is constant; when the operating lever inclination angle becomes the value, controls the pump discharge flow rate, so a control valve passing flow rate is an actuator maximum flow rate when the differential pressure is constant; and when the operating lever inclination angle is between the value and the maximum, defines a maximum pump discharge flow rate, so the pump discharge flow rate is kept to the actuator maximum flow rate.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: April 16, 2019
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Akihiro Kondo, Makoto Ito
  • Patent number: 10180149
    Abstract: A control valve device includes a valve body having an actuator port connected to an actuator and a relief passage configured to allow the actuator port to communicate with a return passage, a spool slidably assembled into the valve body and configured to allow the actuator port to selectively communicate with a supply side or a return side, a relief valve configured to open/close the relief passage to control pressure of the actuator port, and an on/off valve assembled into an assembling hole which is formed in the valve body. The on/off valve configured to allow the actuator port to communicate with the relief passage through the assembling hole at the time of valve open.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: January 15, 2019
    Assignee: KYB Corporation
    Inventors: Syota Mizukami, Takeshi Terao
  • Patent number: 10167835
    Abstract: A hydrostatic drive system of a mobile machine includes a hydraulic work system and a hydraulic work pump that is driven by an internal combustion engine and, when operated as a pump, takes in hydraulic fluid with a suction side from a tank and, with a delivery side, delivers into a delivery line that leads to the hydraulic work system. A bypass valve is provided with which, when the hydraulic work pump is operated as a motor to start the shut-off internal combustion engine, the volume flow delivered by the hydraulic work pump operated as a motor to the delivery side is diverted to the tank. The bypass valve, in the motor operation to start the shut-off internal combustion engine, is actuated into an open position that connects the delivery side of the hydraulic work pump with the tank.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: January 1, 2019
    Assignee: Linde Hydraulics GmbH & Co. KG.
    Inventors: Marcus Dölger, Lukas Krittian
  • Patent number: 10161950
    Abstract: A reagent preparing device capable of supplying a predetermined reagent, which includes a first liquid and a second liquid different from the first liquid, to a measurement section for measuring a specimen using the reagent, comprising: a pressure generator for generating pressure to transfer liquid; a reagent preparing section for executing a preparation operation of the predetermined reagent using the pressure generated by the pressure generator; and a controller configured for performing operations comprising: determining whether or not the reagent preparing section is executing the preparation operation, and controlling the generation of the pressure by the pressure generator according to the determination result, is disclosed. A reagent preparing method and a specimen processing system are also disclosed.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: December 25, 2018
    Assignee: Sysmex Corporation
    Inventors: Koichi Okubo, Noriyuki Nakanishi, Masahiko Oguro, Tomoyuki Asahara, Takayuki Nakajima
  • Patent number: 9995018
    Abstract: A control system of a hybrid construction machine includes a regeneration passage switching valve having a normal position where flow of working fluid is blocked, and a regeneration position allowing for the working fluid to flow from main passages to a regeneration motor when a working fluid pressure of the main passages reaches a set pressure during operation of the actuators, and an assist switching valve having a normal position proportionally dividing the working fluid of an assist passage into a regeneration passages, a first switching position supplying more working fluid of the assist passage to one of the main passages when that the one has a higher working fluid pressure, and a second switching position supplying more working fluid of the assist passage to the other one of the main passages when that the other one has a higher working fluid pressure.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: June 12, 2018
    Assignee: KYB Corporation
    Inventors: Masahiro Egawa, Haruhiko Kawasaki
  • Patent number: 9963856
    Abstract: An object to achieve favorable operability, in a combined operation that involves a specific actuator and involves a great difference in load pressure and when an operation of an operating unit for the specific actuator is a fine operation, by reducing energy consumption arising from wasted restricting pressure loss of a pressure compensating valve and by flexibly varying a flow rate of a hydraulic fluid supplied to the specific actuator depending on the load pressure. To achieve this object, a boom cylinder (3a) is provided with an open center type flow control valve (6a) that controls a hydraulic fluid from a main pump (202) and a closed center type flow control valve (6i) that controls a hydraulic fluid from a main pump (102). The main pump (102) is subject to load sensing control. The flow control valve (6a) is opened to control a supply flow rate up to an intermediate zone of an operating range of an operating unit for the boom cylinder (3a).
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: May 8, 2018
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Kiwamu Takahashi, Kazushige Mori, Yoshifumi Takebayashi, Natsuki Nakamura
  • Patent number: 9945207
    Abstract: A flow control valve for use in oil well bore holes. The flow control valve includes a plurality of flow paths connected in parallel. The flow control valve operates by successively opening different flow paths, starting with a flow path that requires a reduced force to operate its inlet valve. The flow rate through the flow control valve is controlled by opening and closing different ones of the plurality of flow paths individually or in combination. A flow path that allows fluid to flow at substantially the full flow rate of the valve is provided as one of the parallel paths. A simple mechanical design using poppet valves and at least one cam is described.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: April 17, 2018
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Xiaoqi Bao, Mircea Badescu, Stewart Sherrit, Jeffery L. Hall, Yoseph Bar-Cohen
  • Patent number: 9932995
    Abstract: A hydraulic excavator drive system includes: a first hydraulic pump and a second hydraulic pump, whose respective tilting angles are controllable independently of each other; an arm main control valve and an arm auxiliary control valve each for controlling supply of hydraulic oil to an arm cylinder; and a boom main control valve and a boom auxiliary control valve each for controlling supply of the hydraulic oil to a boom cylinder. An arm operation valve outputs a pilot pressure to the arm main control valve. A boom operation valve outputs a pilot pressure to the boom main control valve. A pair of arm-side regulating valves outputs no pilot pressure to the arm auxiliary control valve and a boom-side regulating valve outputs no pilot pressure to the boom auxiliary control valve when an arm crowding operation and a boom raising operation are performed concurrently.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: April 3, 2018
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Akihiro Kondo, Makoto Ito, Kazuto Fujiyama
  • Patent number: 9919907
    Abstract: The invention relates to a method and device for controlling a combined rotary/push movement of a load-receiving means of an industrial truck, in particular a three-way stacker, both the rotary movement and the push movement being brought about by means of respective hydraulic elements (32, 34), which are supplied with hydraulic fluid by a single hydraulic pump (22) which is driven by an associated pump motor (24), and a performance characteristic of the hydraulic pump (22) being controlled according to a predetermined progression over time during the rotary/push movement; the industrial truck comprising a valve assembly (30) which is designed to be operated such that, below a threshold value for the hydraulic pressure provided by the hydraulic pump (22), only the rotary movement of the load-receiving means is brought about, while, above the threshold value, both the rotary movement and the push movement are brought about.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: March 20, 2018
    Assignee: JUNGHEINRICH AKTIENGESELLSCHAFT
    Inventor: Bernhard Hagl
  • Patent number: 9920502
    Abstract: A control system for hybrid construction machine includes a regeneration motor configured to be rotated by working fluid introduced from a turning circuit, a pressure detector configured to detect a turning pressure during a turning operation of the turning motor or a braking pressure during a braking operation of the turning motor, a switching valve for turning regeneration configured to perform turning regeneration by introducing the working fluid from the turning circuit to the regeneration motor when being switched to an open position by a pressure of pilot fluid, an electromagnetic proportional pressure reducing valve configured to be switched to an open position and generate a pilot secondary pressure for switching the switching valve for turning regeneration to the open position when a pressure detected by the pressure detector reaches a first set pressure, and a pilot switching valve configured to allow the passage of the pilot fluid for switching the switching valve for turning regeneration to the op
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: March 20, 2018
    Assignee: KYB Corporation
    Inventors: Haruhiko Kawasaki, Masahiro Egawa
  • Patent number: 9890804
    Abstract: An engine system utilizing a hydraulic pressure includes an engine, a hydraulic system having at least one hydraulic pump discharging a hydraulic oil for operating an actuator and a hydraulic oil tank storing the hydraulic oil returned from the actuator, a hydraulic power transmission device connected to a hydraulic line between the hydraulic pump and the hydraulic oil tank and configured to transmit a hydraulic pressure of the hydraulic oil as a driving source, and a vehicular auxiliary device driven by using the hydraulic pressure transmitted from the hydraulic power transmission device as the driving source.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: February 13, 2018
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Taejoong Wang
  • Patent number: 9885374
    Abstract: A hydraulic system of a vehicle is provided, said system including: a first hydraulic circuit (1) having a first pressure source (2) and at least a first hydraulic consumer (3, 4), a second hydraulic circuit (5) having a second pressure source (6) and at least a second hydraulic consumer (7), connecting means (10, 11) allowing a flow of hydraulic fluid at least from said first hydraulic circuit (1) to said second hydraulic circuit (5), and control means (16) for controlling operation of said hydraulic consumers (3, 4, 7). Such a hydraulic system should allow safe operation of a vehicle with low energy consumption of the hydraulic system.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: February 6, 2018
    Assignee: Danfoss Power Solutions ApS
    Inventor: Carsten Christensen
  • Patent number: 9835180
    Abstract: An object of the invention is to achieve a travel speed known in the art during travelling operation, improve energy efficiency by reducing energy loss, and obtain favorable travel operability less susceptible to effects from variations in a travel load and changes in a pump delivery pressure when travelling operation is performed through operation of a travel lever over a half stroke range or less. A variable restrictor valve 80 is disposed in parallel with a flow sensing valve 50 of an engine speed sensing valve unit 13. A travel pilot pressure is adapted to act in an opening direction of the variable restrictor valve 80. The variable restrictor valve 80 is set to have a continuously increasing opening area from a full closure to a maximum with an increasing travel pilot pressure.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: December 5, 2017
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd
    Inventors: Kiwamu Takahashi, Shingo Kishimoto, Yoshifumi Takebayashi, Kazushige Mori, Natsuki Nakamura
  • Patent number: 9829014
    Abstract: An independent metering valve circuit includes an actuator, a set of independent metering valves, an independent metering valve pre-compensator, an inverse resolver, and a signal conditioning element. The set of independent metering valves are fluidly coupled to the actuator and configured to independently control a flow of a hydraulic fluid to the actuator. The independent metering valve pre-compensator is configured to control the flow of the hydraulic fluid to the set of independent metering valves. The inverse resolver is configured to receive a first pressure signal from the independent metering valve circuit and a second pressure signal from a load-sense hydraulic system and output a third pressure signal. The signal conditioning element is configured to receive the third pressure signal and output a forth pressure signal configured to control a pump fluidly coupled to the load-sense hydraulic system and the independent metering valve circuit.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: November 28, 2017
    Assignee: Caterpillar Inc.
    Inventors: Andrew J. Kleitsch, Pengfei Ma, Jason L. Brinkman, Mikhail Sorokin
  • Patent number: 9752597
    Abstract: A hydraulic control valve assembly to be integrated into a pressure compensated load sensing system including a fluid source is provided. The hydraulic control valve assembly includes a first working unit to control a first hydraulic function of a machine. The first working unit includes a first directional and return flow control in the form of a first spool, a first function flow control to selectively communicate a working pressure of the first function to the fluid source, and a first downstream flow control. The hydraulic control valve assembly further includes a second working unit arranged downstream of the first working unit. The second working unit to control a second hydraulic function of the machine. The first downstream flow control to selectively restrict a flow a fluid from the fluid source to the second working unit.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: September 5, 2017
    Assignee: HUSCO International, Inc.
    Inventors: Casey Buschkopf, Darrell Hesse, Joseph L Pfaff, Jacob Ballweg, Eric P Hamkins
  • Patent number: 9726203
    Abstract: A hydraulic control assembly for a plurality of consumers includes, for each consumer, a supply metering orifice configured to control fluid flow. A flow-sensing fluid-flow-path extends over detection orifices positioned hydraulically in series, whereby a detection orifice is assigned to each supply metering orifice. The fluid-flow-path is connected to a hydraulic pump upstream of the detection orifices, and a control device of the hydraulic pump downstream of the detection orifices. Each detection orifice is configured to close the fluid-flow-path upon detecting a fluid supply deficiency for a corresponding consumer, whereby the control device is configured to interact with the fluid-flow-path such that fluid flow from the hydraulic pump is increased. When no customers have a supply deficiency, the fluid-flow-path over the detection orifices is fully opened, and the control device is configured to reduce fluid flow from the hydraulic pump.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: August 8, 2017
    Assignee: Robert Bosch GmbH
    Inventor: Steffen Knapper
  • Patent number: 9717179
    Abstract: A hydraulic system for use with an agricultural harvester header is provided. The hydraulic system includes a reversible hydraulic pump that drives a reversible hydraulic motor in a forward or harvesting direction and a reverse or header cleaning direction. The system can further include a second reversible pump similarly driving a second reversible hydraulic motor in forward and reverse directions. The pumps and motors can be used to operate various header implements, e.g., the first pump and motor may be used to operate at least a crop cutting knife and the second pump and motor can be used to operate at least one conveyor. The pumps and motors operate within hydraulic circuits which share their hydraulic fluid with the harvester's hydraulic fluid reservoir, thereby reducing system weight, complexity and maintenance requirements.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: August 1, 2017
    Assignee: CNH AMERICA LLC
    Inventor: Jeffrey C. Trowbridge
  • Patent number: 9598837
    Abstract: An excavation system is disclosed for a machine having a work tool. The excavation system may have first and second actuators configured to move the work tool in first and second directions, at least a first valve configured to regulate fluid flow through the first actuator, and at least a second valve configured to regulate fluid flow through the second actuator. The excavation system may also have at least one sensor to generate a first signal indicative of a performance of the first actuator, and a controller in communication with the at least a first valve, the at least a second valve, and the at least one sensor. The controller may be configured to make a first determination that the first actuator is experiencing a stall condition based on the first signal, and to selectively command neutralization of the powertrain and movement of the second actuator based on the first determination.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: March 21, 2017
    Assignee: Caterpillar Inc.
    Inventors: Jeffrey Graham Fletcher, Daniel Aaron Jones, Ricky Kam Ho Chow, Ranishka De Silva Hewavisenthi
  • Patent number: 9587379
    Abstract: The present disclosure relates to a system for reducing fuel consumption in an excavator, and more particularly, to a system for reducing fuel consumption in an excavator, which may reduce fuel consumption when an excavator travels. A technical problem of the present disclosure, which will be achieved, is to provide a system for reducing fuel consumption in an excavator, which may reduce fuel consumption while improving traveling performance of an excavator.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: March 7, 2017
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Won Sun Sohn, Myeong Ku Yeo, Kyung Tae Kim
  • Patent number: 9551361
    Abstract: A travel control valve includes a valve body and a spool. The valve body includes a first pump port connected on an upstream side from a drive control valve, a first connection port connected on a downstream side from the drive control valve, a second pump port connected to a second pump, and a second connection port connected to a second circuit system. The travel control valve can switch a communication opening between the first pump port and the first connection port to a large opening throttle position in which the communication opening remains smaller than that between the second pump port and the second connection port, and a small opening throttle position in which the communication opening remains smaller than that in the large opening throttle position.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: January 24, 2017
    Assignee: KYB Corporation
    Inventor: Takeshi Fujiwara
  • Patent number: 9453503
    Abstract: A method for operating a work attachment of a work machine with a single input is disclosed. In one step of the method, an indication is received that operation of a work circuit in a hydraulic system is to be activated. Upon this indication, the hydraulic system may be placed in a work circuit primary mode in which a pump is placed in fluid communication with the work circuit. The method also includes receiving a lifting lever position and correlating the lifting lever position to a required lifting speed. The method further includes automatically controlling at least two of an engine speed, a pump displacement, and a lifting control valve to satisfy the required lifting speed. Additionally, the operation of the engine speed, pump displacement and lifting control valve may be sequentially staged in pre-defined zones of operation.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: September 27, 2016
    Assignee: Eaton Corporation
    Inventor: Timothy I. Meehan
  • Patent number: 9429175
    Abstract: A hydraulic control valve assembly (10), method and system, characterized by control valves (26) each having a variable metering orifice; a compensator (28) that controls flow of fluid from the variable metering orifice to a work port (A,B) in response to a differential in pressures acting on opposite first and second sides of the compensator, wherein a first side receives a pressure at the downstream side of the variable metering orifice; a load sense passage (34) providing a load sense pressure; and a differential pressure controller (40) having a first inlet connected to a pump supply port and a second inlet connected to the load sense passage, the controller having a first operational mode in which load sense pressure at the second inlet is supplied to an outlet of the controller and a second operational mode in which flow from the first inlet is metered to the outlet of the controller to provide a differential control output pressure, and wherein an outlet of the differential pressure controller is conne
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: August 30, 2016
    Assignee: Parker-Hannifin Corporation
    Inventor: Gregory T. Coolidge
  • Patent number: 9404483
    Abstract: A hydraulic control arrangement includes a common variable displacement pump configured to supply pressure medium to two consumer groups. The pressure level of a control block assigned to one of the consumer groups is set to a different pressure level than that of a further control block assigned to the other consumer group.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: August 2, 2016
    Assignee: Robert Bosch GmbH
    Inventor: Wolfgang Kauss
  • Patent number: 9394151
    Abstract: A materials handling vehicle is provided comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; a hydraulic system; and a control system. The support structure further comprises lift apparatus to effect movement of the movable assembly relative to the support structure fixed member. The lift apparatus includes at least one ram/cylinder assembly. The hydraulic system includes a motor, a pump coupled to the motor to supply a pressurized fluid to the at least one ram/cylinder assembly, and at least one electronically controlled valve associated with the at least one ram/cylinder assembly. The control structure may estimate a speed of the movable assembly from a speed of the motor and control the operation of the at least one valve using the estimated movable assembly speed.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: July 19, 2016
    Assignee: Crown Equipment Corporation
    Inventors: Karl L. Dammeyer, Eric D. Holbrook, Darrin R. Ihle, Marc A. McClain, Lucas B. Waltz
  • Patent number: 9381937
    Abstract: An electro-hydraulic power steering apparatus for an environment-friendly vehicle and a method of controlling the same is provided. In particular, a gear box assists in a steering force of a steering wheel, and a reservoir tank stores hydraulic oil therein. An electro-hydraulic power pump pumps the hydraulic oil via an electric motor to supply the hydraulic oil to the gear box. A first valve is mounted to a hydraulic line through which the hydraulic oil flows from the electro-hydraulic power pump to the gear box, and a second valve is mounted to a hydraulic line through which the hydraulic oil returns from the gear box to the reservoir tank.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: July 5, 2016
    Assignee: Hyundai Motor Company
    Inventor: Young Seol Choi
  • Patent number: 9353770
    Abstract: A hydraulic system for a work vehicle is disclosed. A preferential flow-dividing valve supplies a fixed amount of oil discharged from a variable displacement pump preferentially to a preferential hydraulic oil section and a surplus oil flow from the pump to a non-preferential hydraulic oil section. A plurality of electromagnetic proportional control valves are provided in the non-preferential hydraulic oil section for controlling oil flows relative to a plurality of hydraulically operated devices provided in the non-preferential hydraulic oil section. A necessary flow rate calculating module calculates a necessary oil flow rate in each of the preferential hydraulic oil section and the non-preferential hydraulic oil section based on a preferential oil flow rate of the preferential flow-dividing valve supplied to the preferential hydraulic oil section and an amount of current distributed to each of the plurality of electromagnetic proportional control valves in the non-preferential hydraulic oil section.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: May 31, 2016
    Assignee: Kubota Corporation
    Inventor: Toshiya Fukumoto
  • Patent number: 9346186
    Abstract: A mixer drum driving apparatus includes a liquid-pressure motor that drives the mixer drum to rotate, a liquid-pressure pump that is driven by a motive force of an engine and supplies working liquid to the liquid-pressure motor, an auxiliary liquid-pressure pump that is driven by an electric motor and supplies working liquid to the liquid-pressure motor, a pressure detector that detects a liquid pressure of working liquid discharged from the auxiliary liquid-pressure pump, and a switching valve that switches whether or not working liquid from the auxiliary liquid-pressure pump is supplied to the liquid-pressure motor. In a state in which the switching valve is closed and the mixer drum is being driven to rotate by the liquid-pressure motor that is driven by the liquid-pressure pump, the controller opens the switching valve if a liquid pressure detected by the pressure detector reaches or exceeds a preset liquid pressure.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: May 24, 2016
    Assignee: KYB Corporation
    Inventor: Yoshimitsu Takahashi
  • Patent number: 9303387
    Abstract: A hydraulic system has a pump that furnishes pressurized fluid to a supply node connected to a plurality of functions. Each function includes hydraulic actuator and a control valve assembly through which fluid flows both from the supply node to the hydraulic actuator and from the hydraulic actuator to a return line. A control method involves receiving a plurality of commands, each designating desired operation of a function. Each command is separately used to derive a flow value designating an amount of flow for the respective function, a load value indicating a load magnitude related to the respective function, and a pressure value denoting a supply pressure for the respective function. Then, the control valve assembly for each given hydraulic function is operated in response to the flow and load values for that function and in response to the pressure value that is greatest among the plurality of functions.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: April 5, 2016
    Assignee: HUSCO International, Inc.
    Inventors: Joseph L. Pfaff, Corey K. Quinnell
  • Patent number: 9296598
    Abstract: A materials handling vehicle is provided comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; a hydraulic system; and a control system. The support structure further comprises lift apparatus to effect movement of the movable assembly relative to the support structure fixed member. The lift apparatus includes at least one ram/cylinder assembly. The hydraulic system includes a motor, a pump coupled to the motor to supply a pressurized fluid to the at least one ram/cylinder assembly, and at least one electronically controlled valve associated with the at least one ram/cylinder assembly. The control structure may measure an electric current flow into and/or out of the hydraulic system motor and reduce an operating speed of the hydraulic system motor if the electric current flow into and/or out of the hydraulic system motor is greater than or equal to a predetermined threshold value.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: March 29, 2016
    Assignee: Crown Equipment Corporation
    Inventors: Karl L. Dammeyer, Eric D. Holbrook, Darrin R. Ihle, Marc A. McClain, Lucas B. Waltz
  • Patent number: 9297148
    Abstract: An intelligent knuckle boom control system is disclosed where hoist and stick cylinders raise and lower main and stick booms, respectively, a base end control valve controls flow to the hoist and stick cylinder base ends, a hoist rod control valve controls flow to the hoist cylinder rod end, and a stick rod control valve controls flow to the stick cylinder rod end. A microprocessor computes control signals to direct flow through the control valves based on operator commands and boom position readings. The system can include an energy storage system for storing excess energy and releasing the stored energy, where the microprocessor directs storage of excess energy and release of stored energy. The energy storage system can include a hydraulic accumulator, an accumulator control valve and hydraulic pressure sensors; where the microprocessor receives pressure sensor readings and computes accumulator control valve control signals.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 29, 2016
    Assignee: Deere and Company
    Inventors: Henry J. Stulen, Calin Raszga
  • Patent number: 9228599
    Abstract: A hydraulic circuit for construction equipment is provided, which supplements hydraulic fluid of a hydraulic pump for a cooling fan and hydraulic fluid of a main hydraulic pump and uses the supplemented hydraulic fluid as a hydraulic source of a RCV in order to supply signal pressure to a control valve that controls the driving of a hydraulic actuator.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: January 5, 2016
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Young-Jin Son, Jae-Whan Ok
  • Patent number: 9200646
    Abstract: 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: Grant
    Filed: June 29, 2012
    Date of Patent: December 1, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Weickert, Uwe Neumann, Jan Amrhein
  • Patent number: 9068575
    Abstract: A hydraulic control system for a machine is disclosed. The hydraulic control system may have a work tool movable to perform an excavation cycle having a plurality of segments, a motor configured to swing the work tool during the excavation cycle, and a pump configured to pressurize fluid directed to drive the motor. The hydraulic control system may also have at least one accumulator configured to selectively receive fluid discharged from the motor and to discharge fluid to the motor during the plurality of segments, and a controller configured to implement a plurality of modes of operation. Each of the plurality of modes of operation includes a different combination of segments during which the at least one accumulator receives and discharges fluid.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: June 30, 2015
    Assignee: Caterpillar Inc.
    Inventors: Jiao Zhang, Tonglin Shang, Peter Spring, Pengfei Ma, Randal N. Peterson, Rustu Cesur
  • Patent number: 9003786
    Abstract: This disclosure provides for pressure limiting a hydraulic system to a desired pressure value by a particular circuit by controlling and closing the compensator when the desired pressure setting is achieved. Closing the compensator will reduced the pressure head and flow in the circuit resulting in improved efficiency. One illustrated embodiment of the disclosure provides a relief valve in the pilot signal for a compensator. The method relates to limiting the pressure on an open side of the compensator, such that the pressure on the other side closes the compensator thereby limiting the pressure and also flow in the hydraulic circuit. In other words, the pressure on the open side is limited by the relief valve. Thus, the pressure on the other side increases thereby regulating the flow and pressure through the compensator.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: April 14, 2015
    Assignee: Caterpillar Inc.
    Inventors: Kevin A. Bacon, Jason L. Brinkman, Timothy L. Hand, Randall A. Harlow
  • Publication number: 20150082782
    Abstract: An independent flow rate controlling hydraulic system for pressure control of an excavator, in which a hydraulic system of the excavator can be variably controlled via independent flow rate control. The hydraulic system includes a plurality of actuators which actuate a working apparatus, a pressure control-type hydraulic pump which feeds working fluid to the actuator, first and second electronic proportional control valves which are disposed at a piston-side inlet flow path and a load-side inlet flow path connected from the hydraulic pump to the actuators, third and fourth electronic proportional control valves which are disposed at a piston-side outlet flow path and a load-side outlet flow path connected from the actuators to a hydraulic tank, and a control unit which variably controls areas of the flow paths by controlling the first, second, third and fourth electronic proportional control valves depending on an amount by which a control stick is manipulated.
    Type: Application
    Filed: November 28, 2014
    Publication date: March 26, 2015
    Applicant: HYUNDAI HEAVY INDUSTRIES CO., LTD.
    Inventors: Lim-Gook CHOI, Dong-Bin SHIN, Tae-Sung PARK, Jong-Chan LEE
  • Patent number: 8978374
    Abstract: A hydraulic system includes a variable-displacement first pump and a variable-displacement second pump. The hydraulic system also includes a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a second actuator and a variable-displacement rotary actuator that are each selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 17, 2015
    Assignee: Caterpillar Inc.
    Inventors: Patrick Opdenbosch, Lawrence J. Tognetti, Bryan J. Hillman
  • Patent number: 8978373
    Abstract: A hydraulic system includes a variable-displacement first pump, a variable-displacement second pump, and a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner. The hydraulic system also includes a second actuator selectively connected either to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a variable-displacement rotary actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 17, 2015
    Assignee: Caterpillar Inc.
    Inventors: Patrick Opdenbosch, Lawrence J. Tognetti, Bryan J. Hillman
  • Patent number: 8955316
    Abstract: In a drive train device, in particular a motor vehicle drive train device, with a working fluid pressure system for providing an operating fluid pressure including at least a first and a second operating fluid pressure source connected in at least one operating state directly to the working fluid pressure system, and a lubricating and cooling fluid pressure system with an operating fluid pressure deviating from the operating fluid pressure in the working fluid pressure system, a hydraulic switching unit is provided which in at least one operating state connects the second operating fluid pressure source directly to the lubricating and cooling fluid pressure system for increasing the pressure thereof.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: February 17, 2015
    Assignee: Daimler AG
    Inventors: Michael Baraga, Gerd Jäggle, Steffen Henzler
  • Patent number: 8943819
    Abstract: A hydraulic system includes a variable displacement first pump, a first linear actuator fluidly connected to the first pump via a first closed-loop circuit, a variable displacement second pump, and second and third linear actuators fluidly connected to the second pump in parallel via a second closed-loop circuit. The system also includes a variable displacement third pump, a fourth linear actuator fluidly connected to the third pump via a third closed-loop circuit, a variable displacement fourth pump, and a first rotary actuator fluidly connected to the fourth pump via a fourth closed-loop circuit. The system further includes a second rotary actuator fluidly connected to the second pump in parallel with the second and third linear actuators. The system also includes a third rotary actuator fluidly connected to the third pump in parallel with the fourth linear actuator.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: February 3, 2015
    Assignee: Caterpillar Inc.
    Inventor: Michael L. Knussman
  • Publication number: 20150013319
    Abstract: A hydraulic load-sensing control arrangement for a first and second hydraulic consumer has a variable displacement pump having load-sensing regulation, to which the highest respective load-sensing pressure of consumers is reported. The first consumer has the highest load pressure in normal operation and therefore the highest load-sensing pressure dependent on the load pressure. A pressure reducing valve is arranged in the pressure medium flow path between the variable displacement pump and the first consumer. A spring force from a regulating spring and a regulating pressure dependent on the load pressure of the first consumer are applied in the opening direction of a valve gate in this pressure reducing valve and pressure is applied directly downstream from the pressure reducing valve in the closing direction thereof. A pressure equivalent of the spring force of the regulating spring and the regulating pressure are greater than a pressure of the variable displacement pump.
    Type: Application
    Filed: February 27, 2013
    Publication date: January 15, 2015
    Inventors: Peter Buettner, Robert Rueppel, Timo Ikonen
  • Patent number: 8919114
    Abstract: A hydraulic system is disclosed having first, second, and third pumps. The hydraulic system may also have a first actuator connected to the first pump in closed-loop manner, a second actuator connected to the second pump in closed-loop manner, and a third actuator. The hydraulic system may further have a selector valve associated with the third pump, and a first switching valve associated with the third pump and the third actuator. The first switching valve may be movable between a first position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a first direction, a second position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a second direction, and a third position at which the third pump is connected to the selector valve.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: December 30, 2014
    Assignee: Caterpillar Inc.
    Inventors: Brad A. Edler, Jeffrey L. Kuehn, Jeremy T. Peterson, Michael T. Verkuilen
  • Patent number: 8919115
    Abstract: The operability when performing a combined arm-crowd and bucket operation can be improved. A hydraulic drive device for a hydraulic excavator includes: a bucket directional control valve and a second arm directional control valve, which are connected in parallel tandem with a first hydraulic pump; a first arm directional control valve that is connected to a second hydraulic pump; and a flow rate restriction device that restricts the flow rate of pressure oil supplied to the second arm directional control valve, during crowd operation of a bucket. This flow rate restriction device includes a variable throttle whose opening is controlled so as to become smaller as a bucket operating device is operated to the crowd side, the variable throttle being provided in a bypass path connecting to the supply port of the second arm directional control valve.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: December 30, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Naoki Hagiwara, Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kazunori Nakamura
  • Patent number: 8915075
    Abstract: The invention relates to a hydraulic control arrangement for a mobile machine tool, particularly for a forklift, comprising at least two hydraulic loads (10, 12), one of them having a lifting function. According to the invention, the two loads are each controlled via a LUDV valve with inflow measuring diaphragm (36, 44) and LUDV pressure regulator (46) connected downstream.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: December 23, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Christoph Keyl, Vincenzo Domenico Bollero
  • Patent number: 8915076
    Abstract: A system for providing pressurized hydraulic fluid includes an engine driven main pump and an electrical motor driven auxiliary pump. The auxiliary pump provides hydraulic fluid at line pressure to shift control subsystems during a vehicle launch while the main pump provides hydraulic fluid to cooler or lubrication subsystems during the vehicle launch. A pressure regulation valve regulates the pressure of the hydraulic fluid from the main pump. Once the main pump reaches a critical speed, the main pump provides hydraulic fluid at line pressure to the hydraulic control system and the auxiliary pump is turned off.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: December 23, 2014
    Assignee: GM Global Technology Operations, LLC
    Inventors: Zhe Xie, Hong Yang, Anthony L. Smith, James M. Hart, Steven P. Moorman
  • Patent number: 8910474
    Abstract: A hydraulic system includes a first pump, a first actuator fluidly connected to the first pump via a first closed-loop circuit, a second pump, and a second actuator fluidly connected to the second pump via a second closed-loop circuit. The system also includes a third pump, a third actuator fluidly connected to the third pump via a third closed-loop circuit, a fourth pump, and a fourth actuator fluidly connected to the fourth pump via a fourth closed-loop circuit. The system further includes a first combining valve configured to combine fluid from the first and second circuits, a second combining valve configured to combine fluid from the second and third circuits, and a third combining valve configured to combine fluid from the third and fourth circuits. The system also includes a fourth combining valve configured to combine fluid from the first and fourth circuits.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: December 16, 2014
    Assignee: Caterpillar Inc.
    Inventors: Michael L. Knussman, Brad A. Edler, Patrick Opdenbosch
  • Patent number: 8893490
    Abstract: A method of controlling a hydraulic system includes providing fluid to a first actuator with a first pump via a first closed-loop circuit of a machine, and providing fluid to a second actuator with a second pump via a second closed-loop circuit of the machine. The method also includes providing fluid to a third actuator with a third pump via a third closed-loop circuit of the machine, and providing fluid to a fourth actuator with a fourth pump via a fourth closed-loop circuit of the machine. The method further includes forming a combined flow of fluid including fluid from the first circuit and fluid from at least one of the second, third, and fourth circuits, and directing the combined flow to the first actuator while providing fluid to the actuator of the at least one of the second, third, and fourth circuits.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: November 25, 2014
    Assignee: Caterpillar Inc.
    Inventors: Michael L. Knussman, Brad A. Edler, Patrick Opdenbosch