Having Condition Responsive Pumped Fluid Control Patents (Class 417/213)
  • Patent number: 10995974
    Abstract: A compressor may include a shell assembly, a compression mechanism and a conduit. The shell assembly may include a fitting through which fluid is received from outside of the compressor. The compression mechanism may be disposed within a chamber defined by the shell assembly. The conduit may extend through the chamber between the fitting and a suction inlet of the compression mechanism and transmit at least a portion of the fluid from the fitting to the suction inlet. The conduit may include an inlet that may be spaced apart from the fitting and an outlet that may engage the compression mechanism.
    Type: Grant
    Filed: October 8, 2018
    Date of Patent: May 4, 2021
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Matthew Thomas Piscopo, Brian L. Reid
  • Patent number: 10961998
    Abstract: A control arrangement controls a position of a swashplate in an axial piston pump between a no-stroke position and a maximum stroke position. The control arrangement includes a servo spool mounted for limited sliding movement in a compensator piston cylinder. A solenoid coil is configured to provide a coil force to move the servo spool. A compensator piston is mounted in the compensator piston cylinder in response to movement of the servo spool. A spring between the servo spool and the compensator piston provides a spring force in response to the coil force applied to the servo spool. The control arrangement defines a feedback system configured to maintain a balancing relationship between the spring and coil forces to enable infinite control of the swashplate position.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: March 30, 2021
    Assignee: Hartmann Controls, Inc.
    Inventor: Donald G. Bethke
  • Patent number: 10900506
    Abstract: A construction machine includes: one or more hydraulic pumps discharging a working fluid; an engine supplying a rotational power to the hydraulic pumps; a hydraulic line through which the working fluid discharged by the hydraulic pumps moves; a main control valve provided on the hydraulic line and controlling supply of the working fluid to a traveling device or one or more of various working devices, which require the working fluid; a bypass cut valve provided on the hydraulic line at a lower side thereof than the main control valve to open and close the hydraulic line; an automatic warm-up switch generating a warm-up operation signal for raising a temperature of the working fluid before an operation starts; and a control device performing a warm-up operation for increasing the number of revolutions of the engine and opening the bypass cut valve to increase a flow rate along the hydraulic line, when the warm-up operation signal is received from the automatic warm-up switch.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: January 26, 2021
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventor: Tae Yoon Kim
  • Patent number: 10890174
    Abstract: A hydrostatic system that provides different volumetric efficiency at different states and includes a pump with a discharge and supply line. Connected between the discharge and supply line is a valve. The valve is adapted to move to a position having a cross port orifice when the pump is in a neutral state and a position where the ports are blocked when the pump is in an operation state.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: January 12, 2021
    Assignee: Danfoss Power Solutions Inc.
    Inventor: Joshua Cronbaugh
  • Patent number: 10865890
    Abstract: A control valve including: a valve housing including a piston space; and a control piston which is movably arranged in the piston space and sub-divides the piston space into at least a first valve space and a second valve space, the control valve including at least a leakage path which sets a desired leakage between the first valve space and the second valve space. A motor vehicle device including an adjustable rotary pump including an adjusting means, for adjusting a delivery volume of the rotary pump, and the control valve, using which a pressure for adjusting the adjusting means can be governed, the motor vehicle device including a means which presses the control piston into a first position and holds it there, and the at least one other inlet of the control valve is connected to a high-pressure side of the rotary pump when the rotary pump is in operation.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: December 15, 2020
    Assignee: SCHWÄBISCHE HÜTTENWERKE AUTOMOTIVE GMBH
    Inventors: Sven Peters, Andreas Scheidemann, Lothar Preisler
  • Patent number: 10801533
    Abstract: A fluid pressure circuit for controlling a rod of a cylinder controlled in accordance with an operation command includes a tank, a fluid pressure actuator configured to pressurize fluid supplied from the tank for extending and retracting the cylinder, a flow control valve arranged between the fluid pressure actuator and the cylinder device configured to switch a flow passage of pressurized fluid and discharge via a first throttle return fluid from the cylinder, a variable regeneration switching valve configured to discharge return fluid from the cylinder to the flow control valve upon non-regeneration and upon regeneration, branch part of the return fluid and discharge via a second throttle the fluid branched, a regenerative motor configured for regeneration by fluid branched by the variable regeneration switching valve, and a third throttle connected in series with the first throttle upon the regeneration to limit flow of return fluid.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: October 13, 2020
    Assignee: EAGLE INDUSTRY CO., LTD.
    Inventor: Yoshiyuki Shimada
  • Patent number: 10648468
    Abstract: An adjustable vane pump, in particular an oil pressure pump, with a suction side and a pressure side, with a housing and a rotor supported in the housing so as to be rotatable about a rotor axis. At least one vane is supported for movement in a radial direction. The housing comprises a housing floor and a housing cover transversely to the rotor axis, and an adjustment cage is arranged between the housing floor and the housing cover.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: May 12, 2020
    Assignee: Joma-Polytec GmbH
    Inventors: Thomas Gulde, Andreas Blank, Michael Walter, Ralph Buehler, Torsten Helle
  • Patent number: 10605151
    Abstract: A strategy for controlling an electric pump and control valve in an internal combustion engine cooling system compensates for backpressure variations and maintains system operation within design parameters. The method comprises the steps of measuring the coolant temperature, measuring the electrical current and voltage to the pump motor, determining the pump speed and coolant flow, determining the desired coolant flow, determining a negative correction to the flow control valve and pump if desired flow is less than present coolant flow and determining a positive correction to the flow control valve and pump if desired flow is more than present coolant flow and undertaking this correction to coolant flow. Thus, based upon inferred back pressure in the engine coolant system from the data relating to the pump energy input, proper coolant flow, heat rejection and engine operating temperature can be maintained in spite of variations in system flow restrictions and backpressure.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: March 31, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Eugene V. Gonze, Sergio Quelhas, Vijay A. Ramappan, Michael J. Paratore, Jr.
  • Patent number: 10605238
    Abstract: A compressor includes a cylinder housing having a number of pistons, a control chamber communicating with piston casings, a suction chamber and a discharge chamber communicating with the piston casings, a control valve includes a receptacle engaged in the cylinder housing, a valve member engaged in the receptacle for controlling the pressurized air to flow from the discharge chamber into the control chamber of the cylinder housing, and a valve element for controlling a bypass of the pressurized air through the receptacle. A bellow device is connected to actuate the sliding member internally, and a sliding member is slidably engaged in the control space of the receptacle, and to operate the valve element externally with a solenoid device.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: March 31, 2020
    Inventor: Henry C. Chu
  • Patent number: 10571171
    Abstract: Systems and methods that detect a loss of charge associated with a climate controlled environment are described in the present disclosure. In various embodiments, a controller receives operating condition parameters associated with a climate-controlled environment. The controller determines whether a compressor is operating in a first mode of operation or a second mode of operation. The controller applies a first model to the operating condition parameters when the compressor is operating in the first mode of operation to represent a loss of charge associated with the climate-controlled environment and applies a second model to the operating condition parameters when the compressor is operating in the second mode of operation to represent the loss of charge associated with the climate-controlled environment.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 25, 2020
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Mark Gariety, Paul L. Fullenkamp, Fadi M. Alsaleem
  • Patent number: 10487855
    Abstract: A fluid power system includes an electro-hydraulic variable displacement fluid pump driving fluid at a first displacement value. The system further includes a directional control valve, a sensor, and a controller. The directional control valve includes a valve member movable between a neutral position and at least one actuated position. The directional control valve diverts at least some fluid to an actuator while the valve member is in an actuated position, and the directional control valve exhausts fluid at an exhaust pressure through an outlet port to the fluid reservoir while the valve member is in the neutral position. The sensor measures a difference between the exhaust pressure and a nominal pressure and generates a signal based on the measured difference. The controller generates a flow command at least partially based on the pressure signal to modify the operation of the pump to drive fluid at a second displacement value.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: November 26, 2019
    Assignee: DEERE & COMPANY
    Inventor: Kristen D. Cadman
  • Patent number: 10233951
    Abstract: A system and method for detecting uncommanded positioning of at least one valve spool in a plurality of valve spools and for stopping fluid flow to a plurality of hydraulic actuators fluidly connected to the plurality of valve spools is disclosed. The method may comprise receiving a signal fluid pressure detected in a signal passageway, identifying whether at least one activation command is currently enabled, and stopping the flow of fluid to the plurality of hydraulic actuators if no activation command is enabled for any of the plurality of valve spools, and the signal fluid pressure when detected (1) upstream of the plurality of valve spools is greater than a first threshold or (2) downstream of the plurality of valve spools is less than a second threshold.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: March 19, 2019
    Assignee: Caterpillar Inc.
    Inventors: David J. Lomax, Joshua D. Callaway
  • Patent number: 10227090
    Abstract: A hydraulic drive system includes: control valves; solenoid proportional valves outputting pilot pressures to the control valves; a controller controlling each of the solenoid proportional valves; a primary pressure line leading hydraulic oil from an auxiliary pump to the solenoid proportional valves; a solenoid switching valve provided on the primary pressure line; a movement detection line blocked when any of movement detection target control valves has moved; and a movement detection pressure sensor provided on the movement detection line. The controller controls the solenoid switching valve while all of operation devices are outputting electrical signals indicating that their operating levers are in neutral, such that: the solenoid switching valve opens the primary pressure line if a measurement value of the pressure sensor is less than a threshold; and the solenoid switching valve blocks the primary pressure line if the measurement value of the pressure sensor is greater than the threshold.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: March 12, 2019
    Assignee: KASAWAKI JUKOGYO KABUSHIKI KAISHA
    Inventor: Akihiro Kondo
  • Patent number: 9803665
    Abstract: A control system for a machine is disclosed. The control system may have a bypass passage situated to allow fluid to bypass an actuator, and a warmup valve disposed within the bypass passage that is movable between flow-passing and-blocking positions. A controller is configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, compare the pressure of the fluid of the actuator with a threshold, and move the warmup valve to the flow-blocking position and reduce a pump outlet pressure when the pressure of the fluid is greater than the threshold. The controller may be configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, and adjust an input speed of the pump in response to the signal.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: October 31, 2017
    Assignee: Caterpillar Inc.
    Inventors: Matthew J. Beschorner, Eric Hughes, Naoto Funabiki, Tomohiro Oyama, Brett J. Janson
  • Patent number: 9777464
    Abstract: A load sense open center hydraulic system provides efficiency and operator feedback and includes one or more constant flow-open center valves (218); respective one or more parallel power cores (238) operatively coupled to the one or more constant flow-open center valves; a variable capacity pump (246) directly fluidly connected to the one or more parallel power cores; and a pressure compensated flow control fluidly connected between the variable capacity pump and the one or more constant flow-open center valves. The one or more constant flow-open center valves are not fluidly coupled to a fixed capacity pump.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: October 3, 2017
    Assignee: Parker-Hannifin Corporation
    Inventors: Jarmo Harsia, Patrick Stegemann
  • Patent number: 9732773
    Abstract: A drive system for hydraulically driven working mechanisms of a working machine includes an axial piston pump, the pump capacity and flow direction of which is varied by changing the pivot angle of the axial piston pump. The drive system includes a hydraulic motor connected via a line to the axial piston pump and drivably connected to the working mechanisms, a control unit operated to set the pump capacity of the axial piston pump to zero and a control valve arrangement that is actuated by the control unit to actuate a limiting device such that the pivot angle of the axial piston pump can be mechanically set to zero degrees (0°).
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: August 15, 2017
    Assignee: CLAAS Selbstfahrende Erntemaschinen GmbH
    Inventors: Heinrich Dueckinghaus, Heinrich Schneider, Dirk Schlichting
  • Patent number: 9726158
    Abstract: A swash plate type piston pump includes a plurality of pistons, a cylinder block including a plurality of cylinders for housing the pistons, a swash plate for reciprocating the pistons to expand and contract volume chambers of the cylinders with the rotation of the cylinder block, a biasing mechanism for biasing the swash plate in a direction to increase a tilting angle, a first control pin for driving the swash plate in a direction to reduce the tilting angle according to a first load pressure, and a second control pin for driving the swash plate in a direction to reduce the tilting angle according to a second load pressure. The first and second control pins are connected in series.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: August 8, 2017
    Assignee: KYB Corporation
    Inventor: Tetsuya Iwanaji
  • Patent number: 9651046
    Abstract: A variable capacity vane pump (20) is provided having a pump control ring (44) that is moveable to alter the capacity of the pump (20). A control chamber (60) is formed between the pump casing (22) and the control ring (44). The control chamber (60) is operable to receive pressurized fluid to create a force to move the control ring (44) to reduce the volumetric capacity of the pump (20). A primary return spring (56) acts between the control ring (44) and the casing (22) to bias the control ring (44) towards a position of maximum volumetric capacity. A shaft is coupled at one end to the control ring and a second end of the shaft is positioned a predetermined distance from the casing (22). A secondary return spring (62) is mounted about the shaft and is configured to engage the control ring (44) after the control ring (44) has moved a predetermined amount. The secondary return spring (62) biases the control ring (44) towards a position of maximum volumetric capacity.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: May 16, 2017
    Assignee: MAGNA POWERTRAIN INC
    Inventors: Matthew Williamson, Manmohan Sehmby, Cezar Tanasuca, Karthikeyan Ganesan
  • Patent number: 9441747
    Abstract: A pressure/flow regulator includes a pressure control valve, a flow control valve, and a first control connection configured to set a variable displacement pump. The control connection is configured to be discharged to a tank by the flow control valve via a control edge of the pressure control valve that is open in the idle position of a valve piston of the pressure control valve.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: September 13, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Christian Spielvogel, Friedemann Nordt, Carola Diebold
  • Patent number: 9410514
    Abstract: In a variable displacement oil pump employing a return spring for forcing a cam ring in a clockwise direction, and a control chamber configured to displace the cam ring in a counterclockwise direction with a discharge pressure introduced thereto, a pilot valve is provided to selectively switch between an oil-discharge from the control chamber and an oil-introduction to the control chamber by moving a spool in one direction by a biasing force of a valve spring or by moving the spool in the other direction against the biasing force by the discharge pressure and applied at an oil introduction port of the pilot valve. Also provided is an electromagnetic valve configured to variably control timing at which switching between the oil-discharge and the oil-introduction occurs, with respect to the discharge pressure applied at the oil introduction port, by appropriately changing the preload setting of the valve spring.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: August 9, 2016
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Yasushi Watanabe
  • Patent number: 9323253
    Abstract: A pump control assembly having a flow control assembly disposed between the first end of a load sensing valve and a fluid pump is disclosed. The flow control assembly may include an orifice, a first valve assembly, and a second valve assembly. When the first valve assembly is in an open position and the second valve assembly is in a first position, fluid passing through the orifice is directed to a fluid reservoir and to the load sensing valve. When the first valve assembly is in a closed position and the second valve assembly is in a second position, all fluid passing through the orifice is directed to the load sensing valve. An electronic controller can be configured to transmit an output current to the first and second valve assemblies in response to an operational parameter of a prime mover supplying power to the fluid pump.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: April 26, 2016
    Assignee: Eaton Corporation
    Inventor: Philip James Dybing
  • Patent number: 9222378
    Abstract: A cam phaser includes a rotor, a stator, and a cover. The rotor defines a first hole and a second hole and can rotate relative to the stator between a first intermediate position and a second intermediate position. The cover is mounted on the stator and defines a first lock pin seat and a second lock pin seat. The cam phaser includes a first lock pin and a second lock pin. The first lock pin can move along the first hole and into the first lock pin seat to lock the rotor relative to the stator at the first intermediate position. The second lock pin can move along the second hole and into the second lock pin seat to lock the rotor relative to the stator at the second intermediate position.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: December 29, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: William P. Vukovich, Gerald R. Stabel
  • Patent number: 9097251
    Abstract: A variable-displacement lubricant pump for providing a pressurized lubricant includes a rotor with at least one radially slidable vane configured to rotate in a shiftable stator ring. A first plunger is configured to push the shiftable stator ring into a high pumping volume direction. A pressure control system is configured to control a lubricant discharge pressure of the pressurized lubricant. The pressure control system comprises a first control chamber with the first plunger being configured to move in an axial direction and a side wall. A pump outlet port is connected to the first control chamber via a first pressure conduit. A movable outlet opening is disposed in the side wall of the first control chamber, is connected to a low pressure, and is configured to move with an axial projection and to be actuated by a thermostatic element. The first plunger can cover and close the movable outlet opening.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: August 4, 2015
    Assignee: PIERBURG PUMP TECHNOLOGY GMBH
    Inventor: Jerome Maffeis
  • Patent number: 9033679
    Abstract: A displacement control system (A) of a variable displacement compressor sets a target for pressure in an intake chamber or a crank chamber, on the basis of a detected evaporator-outlet air temperature and a target for evaporator-outlet air temperature. The pressure of a refrigerant in a high-pressure section is detected, and a regulating current is supplied to a solenoid (316) of a displacement control valve, on the basis of the pressure of the refrigerant in the high-pressure section and the target for pressure.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: May 19, 2015
    Assignee: SANDEN CORPORATION
    Inventors: Yukihiko Taguchi, Yoshihiro Ochiai
  • Publication number: 20150132152
    Abstract: A pump system for movement of fluids having a reciprocating piston power pump having at least three reciprocating pistons operable to displace fluid from a housing having a pumping chamber, an integrally forged crankshaft operably connected to the pistons, at least one sensor operable to sense ambient conditions on the pump, and a computer control for processing data from the sensor to regulate the operation of the pump in response to the data. The system also utilizes protective infused treatments for lubricity and enhanced lubrication sprayers and a reset relief valve and pressure sensors operably connected to the computer system for control and monitoring of the pump.
    Type: Application
    Filed: January 20, 2015
    Publication date: May 14, 2015
    Inventor: Gerard S. Lazzara
  • Publication number: 20150118072
    Abstract: A high pressure pumping system in which a first pump delivers a medium to a discharge port and to a second pump which subsequently delivers the medium to the discharge port.
    Type: Application
    Filed: May 8, 2013
    Publication date: April 30, 2015
    Inventor: Jarmo Uolevi LEPPANEN
  • Patent number: 9010138
    Abstract: A variable displacement compressor adjusts the pressure in a control pressure chamber and controls the displacement in accordance with the adjusted pressure. Refrigerant is supplied via a supply passage, and released via a bleed passage. The compressor includes a first control valve for adjusting the cross-sectional area of the supply passage for refrigerant. The compressor further includes a second control valve that adjusts the cross-sectional area of the bleed passage in accordance with the opening/closing state of the first control valve. The second control valve adjusts the cross-sectional area of the bleed passage such that the cross-sectional area when the first control valve is in the closed state is larger than that when the first control valve is in the opened state. The back pressure chamber is located in a section of the bleed passage that is located between the second control valve and the control pressure chamber.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: April 21, 2015
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Hiroyuki Yoshida, Osamu Hiramatsu
  • Publication number: 20150078922
    Abstract: A high pressure pump includes a pump body, a pressurizing chamber, a fuel passage, a union, a seat member, a relief valve seat, a relief valve, a discharge valve seat, a discharge valve, a spring and a spring holder. The union has an inner threaded portion and a step portion formed on an inner wall of the union. The seat member includes a relief passage that extends through the seat member in an axial direction of the seat member and a discharge path that is not in fluid communication with the relief passage. The one opening of the relief passage is closer to the pressurizing chamber than an other opening of the relief passage is to the pressurizing chamber. The one opening of the discharge path is further from the pressurizing chamber than an other opening of the discharge path is from the pressurizing chamber. The seat member is pressed toward the step portion when the spring holder is fastened to the union by engaging the inner threaded portion with the outer threaded portion.
    Type: Application
    Filed: August 22, 2014
    Publication date: March 19, 2015
    Inventors: Shinobu OIKAWA, Masatoshi KUROYANAGI
  • Publication number: 20150044065
    Abstract: A variable displacement swash plate type compressor includes a displacement control valve. The displacement control valve includes a drive force transmitting member, a valve member having a first valve body, a valve chamber, which accommodates the first valve body, an accommodating chamber, which communicates with a control pressure chamber, a pressure sensing mechanism, which adjusts the valve opening degree of the first valve body, a communicating chamber, which is located on the opposite side of the pressure sensing mechanism from the valve chamber, and a second valve body, which is located in the pressure sensing mechanism and selectively opens and closes the communicating chamber. When the current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone in the communicating chamber is higher than a predetermined pressure, the pressure sensing mechanism contracts to open the second valve body.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 12, 2015
    Inventors: Masaki OTA, Yusuke YAMAZAKI, Takahiro SUZUKI, Kei NISHII, Hiromichi OGAWA
  • Publication number: 20150037173
    Abstract: Described are a method and a device for activating an electric vacuum pump for a brake booster of a vehicle. The brake booster is supplied with a vacuum from a vacuum reservoir. The vacuum pump is designed to increase the vacuum in the vacuum reservoir as soon as the vacuum drops below a predefinable switch-on threshold. In order to avoid unnecessarily frequent switching on of the vacuum pump, which may irritate the driver, an expected decrease of the vacuum in the vacuum reservoir as a result of an instantaneous braking operation is estimated and the switch-on threshold of the vacuum pump is temporarily reduced if the vacuum instantaneously prevailing in the vacuum reservoir minus the estimated vacuum decrease is greater than a predetermined adjustment point vacuum, below which the brake booster can no longer act in a sufficiently boosting manner.
    Type: Application
    Filed: September 18, 2012
    Publication date: February 5, 2015
    Inventor: Thomas BRUEX
  • Publication number: 20150019078
    Abstract: An electric actuator-integrated electric power steering system may include an integrated motor which provides rotational force, a hydraulic pump connected to one end of the integrated motor and supplied with the rotational force from the integrated motor to pump working fluid that is used to transmit steering force, and an electric actuator connected to the other end of the integrated motor via a power controlling means. The electric actuator may operate when the rotational force is transmitted to the electric actuator and whether the rotational force from the integrated motor is transmitted to or cut off from the electric actuator may depend on an operation of the power controlling means.
    Type: Application
    Filed: June 10, 2014
    Publication date: January 15, 2015
    Applicant: Hyundai Motor Company
    Inventors: Dae Suk JUNG, Soo Bo PARK
  • Patent number: 8935009
    Abstract: A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps having connected discharge ports is provided. Each pump includes a swashplate and a control valve for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump and determined a desired second pump discharge pressure control law for a second pump. The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve of the first pump is determined using the combined first and second intermediate control variables and the first control law.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: January 13, 2015
    Assignee: Caterpillar Inc.
    Inventors: Hongliu Du, Patrick W. Sullivan
  • Publication number: 20150004010
    Abstract: A control valve is configured such that a suction pressure, which is used to displace a sub-valve element in a valve opening direction after a main valve has been closed, is varied according to a value of current supplied to a solenoid. A crankcase communication port, which communicates with a crankcase of a compressor, and a suction chamber communication port, which communicates with a suction chamber of the compressor, are provided in a body. A sub-valve chamber whose diameter is larger than that of the main valve hole is formed between the crankcase communication port and a main valve hole, and a sub-valve is placed in the sub-valve chamber.
    Type: Application
    Filed: June 18, 2014
    Publication date: January 1, 2015
    Inventors: Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20140377086
    Abstract: An air-driven pump system comprising: a directional unit that defines a directional air chamber and comprises a directional piston, a first process air intake, and a second process air intake; two pump units each including a liquid chamber, an air chamber, and a piston; a shaft affixed to the pistons; an efficiency valve system comprising an efficiency piston, wherein the efficiency unit is configured to divide inlet air entering the air-driven piston pump into control air, first process air, and second process air, and wherein the efficiency piston is in communication with the control air, first process air, and second process air before the air is distributed to the directional unit; and a second shaft which is in communication with the efficiency piston. The efficiency valve system is to prevent overfilling of the air chambers.
    Type: Application
    Filed: September 5, 2014
    Publication date: December 25, 2014
    Applicant: WILDEN PUMP AND ENGINEERING LLC
    Inventor: CARL J. GLAUBER
  • Publication number: 20140369853
    Abstract: A controller for a vehicle pneumatic system loads a compressor responsive to engine power absorption by the engine and air storage facility air pressure readings up to a pressure limit. The controller is responds to power demand on the engine in excess of an engine speed related global maximum and air pressure readings down to a global minimum for unloading the compressor. The controller provides for loading and unloading the compressor to maintain storage facility pressure within an operating maximum and an operating minimum which lie between the global maximum and global minimum pressures. The controller responds to air pressure readings reaching or falling below the global minimum for loading the compressor and to air pressure readings reaching or exceeding the global maximum for unloading the compressor.
    Type: Application
    Filed: January 18, 2012
    Publication date: December 18, 2014
    Applicant: International Engine Intellectual Property Company, LLC
    Inventors: Grzegorz Siuchta, Dean Alan Oppermann, Raul Espinosa Raul Espinosa
  • Patent number: 8899942
    Abstract: A system and method for controlling the volume ratio of a compressor is provided. The system can use a port (88) or ports in a rotor cylinder to bypass vapor from the compression chamber to the discharge passage of the compressor. A control valve (90) can be used to open or close the port or ports to obtain different volume ratios in the compressor. The control valve (90) can be moved or adjusted by one or more valves that control a flow of fluid to the valve. A control algorithm can be used to control the one or more valves to move the control valve to obtain different volume ratios from the compressor. The control algorithm can control the one or more valves in response to operating parameters associated with the compressor.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: December 2, 2014
    Assignee: Johnson Controls Technology Company
    Inventors: William L. Kopko, Paul Nemit, Jr., Angela Marie Comstock
  • Publication number: 20140341710
    Abstract: A refrigerant compressor (10) for use in a chiller-heater system that can provide chilled water at less than 10° C. and hot water at more than 80° C. without the need for additional heat input, the compressor (10) being configured to provide a compression ratio of at least 18:1 and a temperature lift across the compressor of at least 80K, and the refrigerant fluid being selected to give the desired temperature lift without the pressure at the compressor outlet exceeding 25 bar.
    Type: Application
    Filed: December 20, 2012
    Publication date: November 20, 2014
    Inventor: Michael Creamer
  • Publication number: 20140311139
    Abstract: A hydrostatic variable displacement pump (2) has a displacement volume set by an electro-hydraulic control device (10) provided with a safety function. In a fault scenario, the variable displacement pump (2) is set to a neutral position. The electro-hydraulic control device (10) has a single electro-hydraulic setpoint encoder (30) to specify the setpoint of the displacement volume of the variable displacement pump (2) and an electrically actuatable valve device (35) connected in series downstream of the setpoint encoder (30), by which the direction of displacement of the variable displacement pump (2) is controlled and which is provided with the safety function.
    Type: Application
    Filed: February 28, 2014
    Publication date: October 23, 2014
    Applicant: Linde Hydraulics GmbH & Co. KG
    Inventors: Rolf Lasaar, Markus Jung
  • Publication number: 20140294606
    Abstract: An Automatic Fuel Additive Controller and Dispenser has been disclosed. In one implementation a pump is used to purge a hydrostatic sensing tube of liquid prior to measurement.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 2, 2014
    Inventor: Perry Anderson
  • Publication number: 20140294610
    Abstract: A peristaltic pump (1) for pumping a liquid comprises a flexible tube (2) for guiding the liquid to be pumped, a compression means (5) being actuatable for compressing the flexible tube (2), an upstream valve means (3) arranged in an upstream direction with respect to the compression means (5) and being actuatable to selectively open or close the flexible tube (2) upstream of the compression means (5), and a downstream valve means (4) arranged in a down-stream direction with respect to the compression means (5) and being actuatable to selectively open or close the flexible tube (2) downstream of the compression means (5). A drive shaft (6) is provided which is rotatable for periodically actuating the compression means (5), the upstream valve means (3) and the downstream valve means (4).
    Type: Application
    Filed: October 16, 2012
    Publication date: October 2, 2014
    Inventors: Sebastien Labarthe, Jean-Baptiste Berthier
  • Patent number: 8834132
    Abstract: In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: September 16, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroyuki Kato, Yoshinori Ichinosawa, Yasushi Watanabe, Hideaki Ohnishi
  • Patent number: 8821134
    Abstract: A pump having a substantially cylindrical shape and defining a cavity formed by a side wall closed at both ends by end walls wherein the cavity contains a fluid is disclosed. The pump further comprises an actuator operatively associated with at least one of the end walls to cause an oscillatory motion of the driven end wall to generate displacement oscillations of the driven end wall within the cavity. The pump further comprises an isolator operatively associated with a peripheral portion of the driven end wall to reduce dampening of the displacement oscillations.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: September 2, 2014
    Assignee: The Technology Partnership Plc
    Inventor: Richard Janse Van Rensburg
  • Patent number: 8818651
    Abstract: A flow control system for a hydraulic pump of a construction machine that can variably control a discharge flow rate of the hydraulic pump in accordance with load pressure generated by a hydraulic actuator. According to the system, the discharge pressure of the hydraulic pump and the operation rate of the operation lever for the hydraulic actuators is detected, and standard load pressures of the respective hydraulic actuators are set. If the discharge pressure of the hydraulic pump is higher than preset load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is reduced in proportion to the operation rate in accordance with degrees of loads generated by the hydraulic actuators. If the discharge pressure of the hydraulic pump is lower than the standard load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is controlled in proportion to the operation rate.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 26, 2014
    Assignee: Volvo Construction Equipment AB
    Inventors: Hea-Gyoon Joung, Sang-Hee Lee, Hung-Ju Shin
  • Patent number: 8814534
    Abstract: Oil supply apparatus having an electric motor, an oil pump driven by the electric motor and supplying oil to a transmission, an oil temperature sensor detecting oil temperature, and a controller setting a drive torque value and controlling the electric motor so that the electric motor outputs a drive torque according to a detection oil temperature. The controller is configured to perform rotation speed control of the electric motor so that when judging that there is a possibility that the detection oil temperature and oil temperature close to the oil pump are different at electric motor starting, the electric motor rotates at a lower rotation speed than where the electric motor rotates by the drive torque value according to the detection oil temperature before performing the electric motor control by which the electric motor outputs the drive torque according to the detection oil temperature.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: August 26, 2014
    Assignees: Jatco Ltd, Nissan Motor Co., Ltd.
    Inventor: Naoyasu Ikeda
  • Publication number: 20140234128
    Abstract: In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move.
    Type: Application
    Filed: April 24, 2014
    Publication date: August 21, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroyuki KATO, Yoshinori ICHINOSAWA, Yasushi WATANABE, Hideaki OHNISHI
  • Patent number: 8807957
    Abstract: A pump control system which detects a fluid condition in a pump is disclosed. The pump control system may include a control event based on the fluid condition in the pump. The pump control system may detect a fluid condition in the pump by monitoring the frequency response of the pump.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: August 19, 2014
    Assignee: Little Giant Pump Company
    Inventor: Steven W. Hampton
  • Publication number: 20140199182
    Abstract: A reciprocating jetting water pump primarily for use on a vacuum truck is disclosed. The jetting water pump includes a pair of reciprocating pistons that are each movable within an outer cylinder mounted to a center block. The outer surface of each of the pistons includes a polymer surface that is closely spaced to the inner surface of the outer cylinder. The outer surface includes a pair of spaced polymer strips separated by a seal to enhance the seal between the piston and the outer cylinder. Each of the outer cylinders is mounted to the center block by a threaded connection. A control system mounted to the vacuum truck senses the pressure of water leaving the jetting water pump and controls the supply of pressurized hydraulic fluid to the jetting water pump to maintain the water pressure at an operator selected value.
    Type: Application
    Filed: January 10, 2014
    Publication date: July 17, 2014
    Applicant: SUPER PRODUCTS LLC
    Inventors: Jason David Hetcher, Curtis J. Ladish, Michael James Jacobson, Devin Purcell Bader
  • Publication number: 20140154104
    Abstract: A hydrostatic positive displacement machine (2) is operated in a closed circuit and delivers hydraulic fluid into a working circuit. The displacement volume is varied by a control device (6) having a variable displacement piston device (7). The machine (2) has a swivel-back device (40) which, in the event of a decrease of the feed pressure from the feed pressure source (11), guarantees actuation of the machine (2) toward a reduction of the displacement volume. The swivel-back device (40) includes at least one pressure sequence valve (41), which is in communication on the input side with the working circuit of the machine (2). In the event of a decrease in the feed pressure from the feed pressure source (11) below a limit pressure, the pressure sequence valve (41) makes it possible to supply the control device (6) of the machine (2) with hydraulic fluid from the working circuit.
    Type: Application
    Filed: May 20, 2013
    Publication date: June 5, 2014
    Applicant: Linde Hydraulics GmbH & Co. KG
    Inventor: Burkhard Stuermer
  • Patent number: 8714298
    Abstract: A pump apparatus includes a pump housing; a drive shaft; a pump element; a cam ring arranged to vary an inherent discharge amount based on the eccentric amount of the cam ring; a steering state sensing section configured to sense or estimate a steering angle, a steering angular speed or a steering angular acceleration, and to output the steering angle, the steering angular speed or the steering angular acceleration as a steering state sensing signal; and a solenoid configured to be controlled to suppress the eccentric amount of the cam ring so as to decrease the inherent discharge amount with respect to the steering state sensing signal when the vehicle speed is equal to or greater than a first predetermined vehicle speed, relative to the inherent discharge amount when the vehicle speed is smaller than the first predetermined vehicle speed.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: May 6, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventor: Makoto Kimura
  • Patent number: 8690544
    Abstract: An oil pump includes a capacity adjustment mechanism that changes the pump capacity by moving a tubular body in a tube radial direction, with a pump chamber formed between the tubular body and an outer circumference side of a rotor, a first spring biasing the tubular body in a direction in which pump capacity increases, a control valve that converts oil pressure of the oil pump into control pressure and causes the control pressure to act on the capacity adjustment mechanism, and a second spring biasing a valve body in order to set the control pressure in the control valve. The relationship of the biasing forces of the first and second springs is set so that pump capacity is set to maximum when the engine rotational speed is less than a predetermined value, and so that pump capacity is reduced when the engine rotational speed exceeds a predetermined value.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: April 8, 2014
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hisashi Ono, Shinji Kazaoka