Having Condition Responsive Control In A System Of Distinct Or Separately Operable Outputs Or Output Drive Units Patents (Class 60/420)
  • Patent number: 10495220
    Abstract: A hydraulic control system includes a variable displacement hydraulic pump, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure, and a pump displacement input, a hydraulic motor having an inlet and an outlet a fluid circuit including a supply conduit for conducting fluid discharged by the pump to the motor and a return conduit for returning fluid discharged by the motor to the pump, a pump displacement control cooperating with the pump displacement input in order to vary a displacement of the pump, a control circuit in communication with the pump displacement control for controlling the pump output such that the motor is driven at a constant rotational speed and at least two valves controlling a rotational speed of the motor, wherein one of the valves provides coarser flow control resolution and another of the valves provides finer flow control resolution.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: December 3, 2019
    Assignee: UUSI, LLC
    Inventors: Mario Boisvert, Curtis Lizotte, Scott Jones, John Washeleski, Gary Terrill
  • Patent number: 10338580
    Abstract: A system and method for determining an orientation of a vehicle are provided. The system and method determine (with a sensor assembly disposed onboard a first vehicle) a direction in which a fluid flows within the first vehicle. The first vehicle is included in a vehicle consist with a second vehicle. The orientation of the first vehicle relative to the second vehicle is determined based at least in part on the direction in which the fluid flows within the first vehicle. The fluid may be air in an air brake pipe of the vehicle consist.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: July 2, 2019
    Assignee: GE GLOBAL SOURCING LLC
    Inventors: Eugene Smith, David Peltz
  • Patent number: 10329725
    Abstract: A snow groomer having a frame; an attachment connected movably to the frame; a hydraulic assembly having an actuator configured to position the attachment, and a valve configured to control the actuator; a variable-flow pump configured to supply the hydraulic assembly; and a control system configured to calculate the total flow rate demand of the hydraulic assembly, and configured to control the variable-flow pump as a function of the total flow rate demand, so delivery by the variable-flow pump equals the total flow rate demand.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: June 25, 2019
    Assignee: PRINOTH S.P.A.
    Inventor: Klaus Wagger
  • Patent number: 10287750
    Abstract: A rotatory energy recycling control device for a hydraulic excavator, comprising: an oil line selector valve (1), a direction selector valve (2), a sequencing valve (3), a one-way valve (4) and an overflow valve (5); two oil inlets of the oil line selector valve (1) are respectively connected to an opening A and an opening B of a rotary motor; an oil outlet of the oil line selector valve (1) is connected to an inlet of the direction selector valve (2); an outlet of the direction selector valve (2) is connected to an net of the sequencing valve (3); a drainage port of the sequencing valve (3) is connected to an oil tank; an outlet of the sequencing valve (3) and an net of the one-way valve (4) communicate with the overflow valve (5): the outlet of the one-way valve (4) is connected to an energy storage and utilization device; and an outlet of the overflow valve (5) is connected to the oil tank.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: May 14, 2019
    Assignee: XUZHOU XUGONG EXCAVATOR MACHINERY CO., LTD
    Inventors: Zhenxing Wang, Zong Li, Jiasheng Qin, Shuhui Fei, Jijiang Shi, Jianchang Gao, Benqiang Sun, Zhipeng Li, Yang Zheng
  • Patent number: 10233060
    Abstract: The present application relates to a switching valve, a switching hydraulic system, and a crane, in which the switching valve having an oil inlet and an oil outlet comprises at least two pairs of valve oil ports, a pair of cartridge valves provided between each pair of valve oil ports, and the oil inlet and the oil outlet are controlled such that the oil inlet and the oil outlet are capable of shifting between communications with the at least two pairs of valve oil ports. The switching valve switches on and off communication between the oil inlet and the oil outlet and the at least two pairs of valve oil ports by controlling opening or closing of the cartridge valves.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: March 19, 2019
    Assignee: XUZHOU Heavy Machinery Co., LTD.
    Inventors: Zenghai Shan, Shouwei Wang, Yinmei Ren, Lei Zhao, Houbao Qi, Dong Wang
  • Patent number: 10041224
    Abstract: A hydraulic driving system includes first to third liquid-pressure pumps and control valves. The first boom control valve is connected to the first hydraulic pump, and the second arm control valve and the first bucket control valve are connected to the second liquid-pressure pump. Further, the turning control valve and the second bucket control valve are connected to the third hydraulic pump. When a pilot pressure XAk0 is output from a bucket operating device while a turning operation is performed, a command switching device outputs a pilot pressure XAk1 to the first bucket control valve. When the pilot pressure XAk0 is output from the bucket operating device while the turning operation is performed, the command switching device outputs a pilot pressure XAk2 to a second bucket control valve.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: August 7, 2018
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Akihiro Kondo, Makoto Ito, Kazuto Fujiyama
  • Patent number: 10024342
    Abstract: A pump discharge amount is divided in accordance with switch amounts of respective switch valves by leading load pressures of actuators to which compensator valves are connected to respective first pressure chambers of the compensator valves, leading a maximum load pressure selected by a selection unit to respective second pressure chambers of the compensator valves, and controlling respective openings of the compensator valves in accordance with respective pressure actions between the respective pressure chambers. A drain passage is provided to connect the first pressure chamber of the compensator valve to a tank, and a flow dividing ratio modification valve is provided to control a pressure in the first pressure chamber.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: July 17, 2018
    Assignee: KYB Corporation
    Inventors: Takeshi Terao, Masayuki Nakamura
  • Patent number: 10018270
    Abstract: An industrial vehicle includes a hydraulic mechanism, an operation lever, and a pump, a hydraulic control valve unit, a lever operation detector, an internal combustion engine controller, and a valve controller that controls the hydraulic control valve unit. When the lever operation detector detects the operation of the operation lever under a situation in which a speed of the internal combustion engine is less than or equal to a predetermined speed, the valve controller operates the hydraulic control valve unit to discharge the hydraulic oil without supplying the hydraulic oil to the hydraulic mechanism and instructs the internal combustion engine controller to increase the speed of the internal combustion engine, and subsequently operates the hydraulic control valve unit to supply the hydraulic mechanism with the hydraulic oil.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: July 10, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Norihiko Kato, Yukikazu Koide
  • Patent number: 10000906
    Abstract: A shovel may be provided with a swing hydraulic motor, a relief valve provided on the swing hydraulic motor, and an accumulator part that supplies to the swing hydraulic motor a working oil having a pressure lower than a relief pressure of the relief valve. The accumulator part may accumulate the working oil on a braking side of the swing hydraulic motor. The accumulator part may discharge the working oil to an upstream of a main pump.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: June 19, 2018
    Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
    Inventor: Chunnan Wu
  • Patent number: 9920780
    Abstract: Provided is a slewing drive apparatus for a construction machine capable of satisfactory pump-flow-rate control regardless of change in engine speed, including a variable displacement hydraulic pump, a slewing motor, a slewing operation device, a control valve, a relief valve, and a pump-flow-rate control device that performs a relief cut control and includes: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a section for determining a target pump flow rate Qo that is a sum of a slewing-speed correspondence flow rate Q1 and a minimum required relief flow rate Qmin; a section for determining a target pump-tilt-angle qtg obtained by dividing the target pump flow rate Qo by the detected engine revolution number Ne; and a section for adjusting an actual pump-tilt-angle of the hydraulic pump so as to bring the actual pump-tilt-angle to the target pump-tilt-angle qtg.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: March 20, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Koji Ueda, Takaaki Izuka
  • Patent number: 9803748
    Abstract: A hydraulic arrangement for supplying a consumer or actuator includes a first supply device that has at least one pump with an adjustable delivery volume. The hydraulic arrangement further includes a second supply device that is connected in parallel to the first supply device. The second supply device includes a loadable accumulator and a digitally regulated switching valve arrangement.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: October 31, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Gottfried Hendrix, Hermann Mehling, Albert Koeckemann
  • Patent number: 9617923
    Abstract: An engine fuel control system includes a fuel metering valve that controls the flow of fuel between supply and delivery lines which delivers fuel to engine burners. The fuel control system includes a fixed displacement main pump which receives fuel from a low pressure source and delivers the fuel at a first high pressure to the supply line, an augmenter pump which receives fuel from the low pressure source and delivers the fuel at a second high pressure to one or more fuel-pressure operated auxiliary engine devices, and a start valve which is actuated at low engine speeds to open a flow path which diverts fuel delivered by the augmenter pump away from the auxiliary engine devices to the supply line to augment the fuel delivered thereto by the main pump, the start valve being actuated at higher engine speeds to shut the flow path.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: April 11, 2017
    Assignee: ROLLS-ROYCE CONTROLS AND DATA SERVICES LIMITED
    Inventor: Michael Griffiths
  • Patent number: 9593464
    Abstract: A construction machine includes: a swing structure (20); hydraulic and electric motors (25) mechanically coupled to each other; a hydraulic pump (41) that supplies hydraulic fluid to the hydraulic motor; swing control lever (72) that instructs the swing structure to make a swing motion; and a control device (80) that controls at least either a delivery flow rate of the hydraulic pump or an output torque of the electric motor in such a manner that meter-out and meter-in pressures of the hydraulic motor that is run together with the electric motor approach each other when the demanded torque necessary for the swing motion of the swing structure instructed by the swing control lever can be produced by the electric motor alone.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: March 14, 2017
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Shiho Izumi, Kouji Ishikawa, Shinya Imura, Shinji Nishikawa, Tomoaki Kaneta, Hiroaki Amano
  • Patent number: 9410544
    Abstract: In open-circuit hydraulic systems (1), the cross-sections of the supply lines (6) and input valves of the hydraulic pump (3) have to be large, so that sufficient flow flux can be provided. This hinders a reduction of the size of the pump and the whole hydraulic system. It is suggested that the supply flow (7) of a hydraulic pump (3) is charged by a second, charging pump (2), to a mid-pressure level (7). The cross-sections of the supply flow areas can thus be decreased.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: August 9, 2016
    Assignee: Danfoss Power Solutions ApS
    Inventors: Onno Kuttler, Luke Wadsley, Michael D. Gandrud, Pierre Joly
  • Patent number: 9340955
    Abstract: A hydraulic control device for a work vehicle includes: a hydraulic pump that supplies pressure oil; an arm drive actuator that drives, with pressure oil supplied from the hydraulic pump, an arm attached to the work vehicle so as to swing the arm; a bucket drive actuator that drives, with pressure oil supplied from the hydraulic pump, a bucket attached to a front end of the arm, so as to swing the bucket; an arm drive pressure oil control valve that controls drive of the arm drive actuator by controlling pressure oil supplied from the hydraulic pump to the arm drive actuator; a bucket drive pressure oil control valve that controls drive of the bucket drive actuator by controlling pressure oil supplied from the hydraulic pump to the bucket drive actuator; an arm operation unit that controls the arm drive pressure oil control valve; a bucket operation unit that controls the bucket drive pressure oil control valve; an operating state detection unit that detects operating states of the arm drive actuator and the
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: May 17, 2016
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Shimazu, Hiroyuki Azuma, Kazuo Chounan, Yasunori Miyamoto
  • Patent number: 9267590
    Abstract: A hydraulic additional drive includes a hydraulic or having working ports configured to be connected to a pump via a high pressure branch and a low pressure branch. The hydraulic motor further includes a purging port to which a feed pressure is configured to be applied to set a “free-wheel mode” while the working ports are connected to a tank. The pressure at the purging port is limited to a comparatively low value between the feed pressure and the tank pressure by a pre-charging valve integrated into the hydraulic motor. The pre-charging valve is arranged in a free-wheel duct which hydraulically connects the purging port to one of the working ports.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: February 23, 2016
    Assignee: Robert Bosch GmbH
    Inventor: Heinz-Gerhard Essig
  • Patent number: 9239085
    Abstract: A method is provided for controlling a hydraulic system having at least an implement pump, a fan-steering-braking (FSB) pump, a valve assembly, a fan drive system and one or more accumulators. The method may determine an operational state of a power source associated with the hydraulic system, actuate one or more valves of the valve assembly such that the FSB pump charges the accumulators and operates at least the fan drive system if the power source is operating at less than maximum power, and actuate one or more valves of the valve assembly such that the accumulators operate at least the fan drive system and such that the FSB pump supplements the implement pump as needed if the power source is operating at maximum power.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: January 19, 2016
    Assignee: Caterpillar Inc.
    Inventors: Bryan Edward Nelson, Jeremy Todd Peterson
  • Patent number: 9194382
    Abstract: A hydraulic pump control system provided in a construction machine such as an excavator is provided. According to the hydraulic pump control system, a loss of a flow rate is reduced by initially supplying hydraulic fluid as much as necessary from a hydraulic pump to a hydraulic motor in order to accelerate a swing movement of an upper frame against a lower traveling structure or to make an upper swing structure swing.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: November 24, 2015
    Assignee: VOLVO CONTRUCTION EQUIPMENT AB
    Inventors: Hung-Ju Shin, Hea-Gyoon Joung, Sang-Hee Lee
  • Patent number: 9151019
    Abstract: A hybrid-type construction machine comprises an engine 11; an electric power accumulator 19B; first and second pumps 28, 14; a motor generator 27 for driving the first pump 28; and plural actuators 1A, 1B, 7, 8 and 9 which are driven by the first and second pumps 28, 14, wherein the first and second pumps 28, 14 are arranged such that the first pump 28 controls at least one of the actuators 1A, 1B, 7, 8 and 9 independently from the second pump 14 and the second pump 14 controls at least another one of the actuators 1A, 1B, 7, 8 and 9 independently from the first pump 28, the first pump 28 is electrically driven by the motor generator 27 with electric power from the electric power accumulator 19B, and the second pump 14 is directly coupled to the engine 11.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: October 6, 2015
    Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
    Inventors: Tetsuji Ono, Chunnan Wu
  • Publication number: 20150135695
    Abstract: A method for controlling the operation of at least one hydraulic component of a work vehicle may generally include storing, with a computing device, a first electro-hydraulic setting and a second electro-hydraulic setting for the hydraulic component. The first electro-hydraulic setting may be associated with at least one of a pre-defined speed setting or a pre-defined sensitivity setting. The second electro-hydraulic setting may be associated with at least one of an operator-defined speed setting or an operator-defined sensitivity setting. In addition, the method includes receiving an input associated with an operator's selection of the first electro-hydraulic setting or the second hydraulic setting, and controlling the operation of the hydraulic component in accordance with the first electro-hydraulic setting or the second electro-hydraulic setting based on the operator's selection.
    Type: Application
    Filed: August 25, 2014
    Publication date: May 21, 2015
    Inventors: Sebastian Thekanath, Subramanian Arunachalam, Timothy Newlin, Scott Eisfeldt, Joel Garcia
  • Patent number: 9016052
    Abstract: According to the present disclosure, a hydraulic control apparatus for construction machinery comprises: hydraulic pumps; first and second control valve units which control the flow directions of working oil discharged from the hydraulic pumps to supply the working oil to first and second work machines, respectively, and which control the degree of opening of flow channels which interconnect the first and second work machines and the hydraulic pumps, respectively; and a control unit which controls the first and second control valve units in accordance with operating signals inputted from first and second operating units.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 28, 2015
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Yong Lak Cho
  • Patent number: 8984873
    Abstract: A hydraulic system includes a variable-displacement first pump, an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner, and an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner. The hydraulic system also includes a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 24, 2015
    Assignee: Caterpillar Inc.
    Inventors: Patrick Opdenbosch, Lawrence J. Tognetti, Bryan J. Hillman
  • Publication number: 20150075149
    Abstract: A flexible response secured mechanical balancing device (D) for multiple hydraulic control actuators (1-2) with a common output member (5a-b). The balancing device (D) provides flexible/continuous fluid-pressure force fight compensation. Balance valves (17-20) are commanded to balance fluid-pressure from a first fluid-pressure network (52a) of a second actuator (2). Each fluid-pressure commanded balance valve (17-20) is arranged to allow relief of differential pressure, directly into a dedicated first (52a) or second fluid-pressure network (52b). A fluid-pressure controlled locking device (21-22) is allowing inhibiting the corresponding pairs of balance valves (17-20) e.g. in case of loss of fluid-pressure. The invention typically applies to vehicles (A) including: aircrafts, rotorcrafts, drones.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 19, 2015
    Inventor: Gregor PAULMANN
  • Publication number: 20150081179
    Abstract: A hydraulic system for a machine is disclosed. The hydraulic system may have a tank configured to hold a supply of fluid, a pump configured to draw fluid from the tank and pressurize the fluid, a first cylinder operatively connected between a first side of a work tool and an undercarriage of the machine, and a second cylinder operatively connected between a second side of the work tool and the undercarriage of the machine. The hydraulic system may also have a first electro-hydraulic valve associated with the first cylinder and configured to selectively regulate a flow of pressurized fluid to the first cylinder independently of the second cylinder, and a second electro-hydraulic valve associated with the second cylinder and configured to selectively regulate a flow of pressurized fluid to the second cylinder independently of the first cylinder.
    Type: Application
    Filed: November 24, 2014
    Publication date: March 19, 2015
    Applicant: Caterpillar Inc.
    Inventors: Timothy L. Hand, Heather Armistead, Fuaad Sayeed, Srikalyan C. Puranam, Stephen Garnett
  • Publication number: 20150075148
    Abstract: A hydraulic control system is provided in which hydraulic oil discharged from a variable displacement hydraulic pump is controlled and supplied to a hydraulic actuator by a closed center control valve activated based on operation input from an operation device, thereby controlling activation of the hydraulic actuator. With the pump displacement detected by pump displacement detecting means and the pump output pressure detected by pump output pressure detecting means being used as feedback input and the characteristic value determined by the operation input and the feedback input being used as a target value of a control loop, variable displacement control is performed by a controller provided with a horsepower control loop, a pressure control loop, a flow rate control loop, and a minimum pressure holding loop that feed back a calculated value based on the feedback input or the feedback input itself.
    Type: Application
    Filed: May 18, 2012
    Publication date: March 19, 2015
    Inventor: Kenpei Yamaji
  • Patent number: 8973358
    Abstract: A hydraulic system is disclosed. The hydraulic system may have a unidirectional variable displacement first pump, a first actuator connected to the first pump via a closed-loop first circuit, and a first switching valve disposed between the first actuator and the first pump. The first switching valve may be configured to control a fluid flow direction through the first actuator. The hydraulic system may also have a second actuator connected to the first pump in parallel with the first actuator via the first circuit, and a second switching valve disposed between the second actuator and the first pump. The second switching valve may be configured to control a fluid flow direction through the second actuator. The hydraulic system may further have a modulation valve associated with the first circuit and configured to selectively modulate a pressure of the first circuit during actuation of the first or second switching valves.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 10, 2015
    Assignee: Caterpillar Inc.
    Inventors: Jeffrey L. Kuehn, Brad A. Edler, Jeremy T. Peterson, Michael T. Verkuilen
  • Publication number: 20150059329
    Abstract: A hydraulic system for a construction machine having a pressure compensation valve is disclosed, which improves operability when a combined operation of a swing device and an attachment is performed.
    Type: Application
    Filed: April 17, 2012
    Publication date: March 5, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Sang-Ki Bae, Jae-Hoon Lee
  • Patent number: 8966892
    Abstract: A hydraulic system is disclosed. The hydraulic system may have a primary pump, a hydraulic actuator, and first and second passages fluidly connecting the primary pump to the hydraulic actuator in a closed-loop manner. The hydraulic system may also have a charge circuit, a makeup valve movable to selectively allow charge fluid from the charge circuit to enter the first or second passages, and at least one restricted pilot passage configured to direct pilot fluid to the makeup valve to move the makeup valve and allow the charge fluid into the first and second passages.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: March 3, 2015
    Assignee: Caterpillar Inc.
    Inventors: Patrick Opdenbosch, Michael L. Knussman, Joshua Dierking
  • Patent number: 8972124
    Abstract: A work vehicle includes an engine, an idling stop execution portion, a determination portion, a counting portion, and an idling stop time period adjustment portion. The engine can rotate in a first idling state and a second idling state in which the engine rotates at the number of rotations higher than a prescribed number of rotations. The idling stop execution portion performs an idling stop operation for stopping the engine. The determination portion determines whether or not stop has been made from the second idling state. The counting portion counts the number of times of stop of the engine from the second idling state. An idling stop time period adjustment portion makes a prescribed time period of the second idling state longer than a current time period, when the number of times of stop of the engine is equal to or greater than the prescribed number of times.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: March 3, 2015
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Mori, Jin Yogita
  • Publication number: 20150047334
    Abstract: The present disclosure is directed to a hydrostatic transmission apparatus including a pump, a first motor, and a second motor having two elementary motors, each of them and the first motor having feed/discharge first and second enclosures. In work mode and in road mode the second enclosure of the first elementary motor of the second motor and the first enclosure of the first motor are connected together in series, the second enclosure of the first motor being connected to the second port of the pump and the second enclosure of the second elementary motor of the second motor is connected to the second port of the pump. In work mode, the first enclosure of each of the two elementary motors of the third motor is connected to the first port of the pump.
    Type: Application
    Filed: July 26, 2012
    Publication date: February 19, 2015
    Applicant: POCLAIN HYDRAULICS INDUSTRIE
    Inventors: André Prigent, Romain Gostomski, Jean Heren
  • Publication number: 20150040548
    Abstract: A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.
    Type: Application
    Filed: August 9, 2013
    Publication date: February 12, 2015
    Applicant: Caterpillar Inc.
    Inventors: Susan E. Bieker, Eric P. Jakubiak, Dennis R. Barber, John J. Kaufman, Edward W. Mate, Scott D. Vollmer, Michael D. Hudson, Moses I. Akpan
  • Patent number: 8950180
    Abstract: A hybrid construction machine drives the upper swing structure using a hydraulic motor and an electric motor together and is capable of regenerating the energy of the upper swing structure in deceleration or stopping into electric power and using the regenerated electric power for assisting the hydraulic motor for driving the upper swing structure. The opening area characteristics of a meter-out restrictor and a bleed-off restrictor of a swing directional control valve are set to become larger than for construction machines driving the upper swing structure with the hydraulic motor alone. Torque of the electric motor is controlled so that the total sum of the actual torque occurring in the hydraulic and electric motors in deceleration or acceleration of the hydraulic motor equals the torque occurring when the opening area of the meter-out restrictor or the bleed-off restrictor is set at the prescribed opening area.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: February 10, 2015
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Takatoshi Ooki, Yusuke Kajita, Hidetoshi Satake, Seiji Ishida, Shiho Izumi, Kouji Ishikawa, Shinya Okumura, Manabu Edamura
  • Publication number: 20150020515
    Abstract: The present disclosure is related to a drive system for a ground engaging member of a machine. The drive system includes first and second hydraulic motors that are disposed parallel to each other. The drive system also include first and second brake valves that are configured to regulate flow of fluid through the first and second hydraulic motors in order to selectively perform braking. The first hydraulic motor is in fluid communication with a first input line and a first output line. The second hydraulic motor is in fluid communication with a second input line and a second output line. A first connection line is configured to fluidly communicate the first input line with the second input line to equalize pressure therebetween. A second connection line is configured to fluidly communicate the first output line with the second output line to equalize pressure therebetween.
    Type: Application
    Filed: October 9, 2014
    Publication date: January 22, 2015
    Applicant: Caterpillar Global Mining LLC
    Inventor: Gary L. Dostal
  • Publication number: 20140373523
    Abstract: A hydrostatic travel drive has a variable displacement pump, two hydraulic motors arranged in series and supplied with pressure medium in a closed hydraulic circuit by the variable displacement pump, and a flow control valve, via which a pressure medium volume flow flows from a line segment between the two hydraulic motors to a pressure sink. The flow control valve is integrated into a housing of a first of the two hydraulic motors.
    Type: Application
    Filed: June 13, 2014
    Publication date: December 25, 2014
    Inventors: James Brown, Iain Edward
  • 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
  • Publication number: 20140325975
    Abstract: Disclosed is a swing relief energy regeneration apparatus in which working oil relieved into a hydraulic tank is stored in a pressure accumulator during swing and deceleration to recycle the stored pressure.
    Type: Application
    Filed: December 2, 2011
    Publication date: November 6, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Sung-Gon Kim, Jae-Hong Kim
  • Patent number: 8862337
    Abstract: The present disclosure provides embodiments directed towards a system for the control of hydraulic output by a hydraulic power source. In one embodiment, a system is provided. The system includes a hydraulic supply system having a drive, a hydraulic pump coupled to the drive, a first hydraulic output configured to supply a first flow of a hydraulic fluid from the hydraulic pump to a hydraulic lift, a second hydraulic output configured to supply a second flow of the hydraulic fluid from the hydraulic pump to a first hydraulic tool, and a controller configured to adjust a speed of the drive in response to a feedback indicative of a first load by the hydraulic lift, a second load by the first hydraulic tool, or a combination thereof.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: October 14, 2014
    Assignee: Illinois Tool Works Inc.
    Inventors: Mark Edwin Peters, Ross Renner
  • Publication number: 20140298790
    Abstract: A vehicle automatic transmission of a multistage type includes multiple engagement elements having an engagement state switched by an oil pressure to selectively establish a plurality of shift stages based on a combination of engagement and release of the multiple engagement elements according to an oil pressure supplied from a hydraulic circuit, each of the shift stages being established by engagement of two or more engagement elements of the multiple engagement elements, at least one of the multiple engagement elements being a normally closed engagement element engaged when no oil pressure is supplied from the hydraulic circuit, and the normally closed engagement element being a meshing engagement element.
    Type: Application
    Filed: November 22, 2011
    Publication date: October 9, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shinji Oita, Masaru Morise
  • Publication number: 20140298789
    Abstract: A hydrostatic travel drive includes a hydraulic pump that is arranged in a hydraulic circuit with two pairs of hydraulic motors. To prevent a pressure build-up between the hydraulic motors of a hydraulic motor pair on steering while stationary, a valve device is configured to set a pressure relief to a working line or to low pressure. A mobile device includes the hydrostatic travel drive.
    Type: Application
    Filed: April 9, 2014
    Publication date: October 9, 2014
    Applicant: Robert Bosch GmbH
    Inventors: Sven-Ruediger Naumann, Heinz-Gerhard Essig
  • Patent number: 8855872
    Abstract: A construction machine includes: a work device; an operation device which receives a manipulation; a hydraulic unit including a hydraulic motor; an electric unit including an electric motor and an energy storage unit; a control device which makes the electric power of the energy storage unit assist the hydraulic unit upon the manipulation for the drive side, and makes the electric motor generate regenerative electric power unit upon the manipulation for the regeneration side; and a power-discharge command unit which issues a discharge command for the energy storage unit. Upon receiving the discharge command, the control device operates the electric motor to lower a voltage of the energy storage unit upon the manipulation for the drive side, and makes only the hydraulic unit decelerate or stop the work device upon the manipulation for the regeneration side.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: October 7, 2014
    Assignee: Kobelco Construction Machinery Co., Ltd.
    Inventor: Yoichiro Yamazaki
  • Publication number: 20140283510
    Abstract: A shuttle valve connects a second flowpath and a drain flowpath when the hydraulic pressure in a first flowpath is greater than the hydraulic pressure in the second flowpath. The shuttle valve connects the first flowpath and the drain flowpath when the hydraulic pressure in a second flowpath is greater than the hydraulic pressure in the first flowpath. The ratio between the pressure receiving area of a first pressure section and the pressure receiving area of a second pressure section is the same as the ratio between the pressure receiving area of a first chamber side and the pressure receiving area of a second chamber side of a cylinder rod.
    Type: Application
    Filed: September 11, 2012
    Publication date: September 25, 2014
    Applicant: KOMATSU LTD.
    Inventors: Teruo Akiyama, Noboru Iida, Koji Saito, Koji Yamashita
  • 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
  • Publication number: 20140208734
    Abstract: Provided is a load sensing system for controlling a discharge pressure of the hydraulic pump so as to render a differential pressure obtained by subtracting a maximum load pressure among the hydraulic actuators from a discharge pressure of the hydraulic pump to be a constant pressure, and there are provided: a first load pressure flow passage which introduces load pressures of the hydraulic actuators to be outputted to a PLS transmission line which transmits the maximum load pressure among the hydraulic actuators at the time of activating the hydraulic actuators; and a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to the PLS transmission line during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in the first load pressure flow passage.
    Type: Application
    Filed: December 11, 2012
    Publication date: July 31, 2014
    Applicant: KUBOTA CORPORATION
    Inventor: Hiroshi Horii
  • Publication number: 20140165548
    Abstract: A work machine includes a swing hydraulic motor and a swing electric motor for driving an upper swing structure. A capacitor supplies electricity to the swing electric motor and an operating device outputs through one operation, an operating signal for concurrently operating the swing hydraulic motor and the swing electric motor. A main controller switches between a hydraulic-alone drive mode and an electric-alone drive mode, the hydraulic-alone drive mode being a mode to drive only the swing hydraulic motor selected from the swing hydraulic motor and the swing electric motor when the operating device is operated, the electric-alone drive mode being a mode to drive only the swing electric motor selected from the swing hydraulic motor and the swing electric motor when the operating is operated. Therefore, the actuator that malfunctions can easily be specified among the plurality of mounted actuators.
    Type: Application
    Filed: May 10, 2012
    Publication date: June 19, 2014
    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinji Nishikawa, Kouichi Shibata, Takako Satake, Manabu Edamura, Takatoshi Ooki
  • Publication number: 20140166362
    Abstract: An implement pose control system and method is provided for a machine. The system and method include determining an actual implement pose having a first actual angle component relative to the first implement rotational axis and a second actual angle component relative to the second implement rotational axis. A desired implement pose may be determined that has first and second desired angle components relative to the first and second implement rotational axes. First and second axis errors may be determined, and the first and second actuators may be automatically operated in response to the error signals.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 19, 2014
    Applicant: CATERPILLAR INC.
    Inventors: Todd Rowland Farmer, Christopher Erik Bright
  • Patent number: 8752371
    Abstract: An independent metering valve (IMV) assembly is disclosed that includes a metering stem including an inlet. The IMV assembly also includes a hydro-mechanical control valve in communication with a fluid source and the inlet. The control valve also including a spool with a closed end and an open end. The control valve includes a biasing member that biases the control valve or spool towards an open position thereby establishing communication between the fluid source and the inlet. The control valve also including a load signal line providing communication between an outlet of the control valve upstream of the inlet and the closed end of the spool. Wherein high pressure in the load signal line allowing the control valve to move towards a closed position thereby overcoming bias of the biasing member and reducing flow to the inlet during a high pressure condition.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: June 17, 2014
    Assignee: Caterpillar Inc.
    Inventors: John Ferraz, Aleksandar M. Egelja, Pengfei Ma, Matthew J. Beschorner
  • Publication number: 20140137545
    Abstract: This disclosure is directed towards a hydraulic system for providing auxiliary drive to a powertrain (11) and a hydraulic circuit (12) by storing and releasing hydraulic fluid using an accumulator (29). A hydraulic drive system (10) comprises an engine (14), a hydraulic machine (22) operably connected to the engine (14), a pump (17), an accumulator (29) and at least one valve (20, 27). The pump (17) is driven by the engine (14) and is configured to control a hydraulic circuit (12). The accumulator (29) is fluidly connected to the hydraulic circuit (21) and the hydraulic machine (22). In one instance, the at least one valve (20, 27) is operable to direct pressurised fluid from at least one of the hydraulic machine (22) and the pump (17) to charge the accumulator (29). Alternatively, the at least one valve (20, 27) is operable to direct pressurised fluid from the accumulator (29) to at least one of the hydraulic machine (22) and the hydraulic circuit (21).
    Type: Application
    Filed: June 18, 2012
    Publication date: May 22, 2014
    Applicant: Caterpillar Inc.
    Inventors: Andrew John Smith, Robert Nicholas Harper
  • Publication number: 20140137548
    Abstract: Construction machinery that can achieve a great fuel reduction effect through an efficient use of recovered energy is provided. The Construction machinery includes at least two actuators 7 and 8, a main pump 3 that generates hydraulic energy for driving the actuators 7 and 8, flow control means 4 disposed between the main pump 3 and the actuators 7 and 8, an additional energy generating means 11 that generates energy to be added to the hydraulic energy, and a control means 20 that reduces hydraulic energy generated by the main pump 3 when the additional energy generating means 11 generates energy. The construction machinery further comprises changeover means 12d, 12e, and 12f that selectively change a location at which the energy from the additional energy generating means 11 is to be added according to the actuators 7 and 8. The control means 20 changes a reduction rate of the hydraulic energy generated by the main pump 3 depending on a specific actuator 7 or 8 to which the energy is to be added.
    Type: Application
    Filed: June 1, 2012
    Publication date: May 22, 2014
    Inventors: Shinji Nishikawa, Seiji Hijikata, Kouji Ishikawa, Shinya Imura, Takako Satake, Takatoshi Ooki
  • Publication number: 20140116041
    Abstract: A walk behind aerator hydrostatic traction drive system includes left and right rear wheel hydrostatic motors driving left and right rear wheels positioned forwardly of a coring head, and a front wheel hydrostatic motor driving a single steerable front wheel carried in a pivotal yoke. The pivotal yoke is coupled to a handle assembly attached to a neck extending upwardly and forwardly for pivoting the single steerable front wheel about a vertical pivot axis. A check valve is connected in parallel to the front wheel hydrostatic motor. The check valve opens if the walk behind aerator moves in a forward direction and the handle assembly is turned to pivot the single steerable front wheel and the front wheel rotates more than each rear wheel, or if the walk behind aerator moves in a reverse direction.
    Type: Application
    Filed: October 30, 2012
    Publication date: May 1, 2014
    Applicant: DEERE & COMPANY
    Inventors: Stanley K. Hall, Bradley P. Aldridge, Loren A. Zabel
  • Publication number: 20140116039
    Abstract: The present disclosure relates to an apparatus for controlling/regulating the travel speed of a utility vehicle comprising at least one drive motor, at least one hydraulic pump, at least one control slide valve, at least one hydraulic travel motor, at least one further hydraulic drive, as well as at least one controller. In accordance with the present disclosure, the travel speed of the at least one hydraulic travel motor is controlled/regulated via at least the speed of the drive motor, while the at least one further hydraulic drive does not provide any drive power.
    Type: Application
    Filed: October 22, 2013
    Publication date: May 1, 2014
    Applicant: Liebherr-Hydraulikbagger GmbH
    Inventors: Johannes Lang, Bernhard Meitinger