Electrical Feedback Means Patents (Class 60/390)
  • Patent number: 10920799
    Abstract: An example valve assembly includes a meter-in valve configured to be fluidly coupled to a first source of pressurized fluid and control fluid flow from the first source of pressurized fluid into a first chamber of an actuator; a counterbalance valve including configured to open and control fluid flow from a second chamber of the actuator to a tank in response to a pilot pressure fluid signal received at a pilot port of the counterbalance valve; and a pressure reducing valve configured to be fluidly coupled to a second source of pressurized fluid and to be fluidly coupled to the pilot port of the counterbalance valve, where the pressure reducing valve is configured to receive pressurized fluid from the second source of pressurized fluid and, when actuated, provide the pilot pressure fluid signal to the pilot port of the counterbalance valve.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: February 16, 2021
    Assignee: Sun Hydraulics, LLC
    Inventors: Riccardo Bianchi, Steven T. Weber
  • Patent number: 10502317
    Abstract: A hydraulic system according to the present invention includes a rotational shaft, a hydraulic rotor supported by the rotational shaft so as to be incapable of relative rotation, an output adjuster varying a volume of the hydraulic rotor, a control shaft tilting the output adjuster, a drive motor operating the control shaft around the axis, a drive shaft disposed on a reference axis same as the axis of the control shaft and operably driven around the axis by the drive motor, a deceleration mechanism decelerating rotary power input from the drive shaft and outputs the decelerated rotary power toward the control shaft, and a housing accommodating the hydraulic rotor, the output adjuster, and the deceleration mechanism, wherein the deceleration mechanism has a hypocycloid-type deceleration mechanism disposed on the reference axis.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: December 10, 2019
    Inventors: Kengo Sasahara, Hiroaki Hashima, Hajimu Imanaka, Hiroshi Sugimoto
  • Patent number: 9593466
    Abstract: A hydraulic shovel includes an engine; a hydraulic pump driven by the engine; an excavating attachment which is driven by high oil discharged from the hydraulic pump; a motor generator that assists a power supply of the engine; and an assist control unit that controls the motor generator to assist the engine in a latter part of the excavating operation by the excavating attachment.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: March 14, 2017
    Inventors: Hideto Magaki, Ryuji Shiratani, Jitsutaka Takeo
  • Publication number: 20150135693
    Abstract: The present invention includes an information generator to set a lever manipulation amount total sum decrease flag during a period when a lever manipulation amount total sum is decreasing, a first processor to process an engine actual output, an engine actual output latching function block to output the maximum value of the engine actual output until the present during a period in which a lever manipulation amount total sum decrease flag is not set, and output the present engine actual output during a period in which the flag is set, a second processor to output an engine target output based on the engine output, and a controller to control the engine speed under limitation of the engine target output.
    Type: Application
    Filed: May 31, 2013
    Publication date: May 21, 2015
    Applicant: KOMATSU LTD.
    Inventors: Kentaro Murakami, Tadashi Kawaguchi
  • Publication number: 20080295506
    Abstract: A hydraulic circuit includes a first pressurizing section for pressurizing a wheel cylinder by operating a master cylinder, and a second pressurizing section for pressurizing the wheel cylinder independently of operation of the master cylinder.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 4, 2008
    Inventors: Takanobu Saito, Motohiro Higuma
  • Patent number: 7037236
    Abstract: A hydraulic transmission (21) has an electric actuator (86) for changing its output/input rotation speed ratio. A controller 90 of the actuator memorizes a command current value to the actuator supposing that load is not applied on the hydraulic transmission, and calculates a value of load applied on the hydraulic transmission by calculating a difference between an actual command current value to the actuator and the memorized command current value. A command current value is compensated based on the value of load, and the actuator receives feedback to be controlled. A vehicle may have a differential mechanism (10), which combines rotation powers on input side and output side of the hydraulic transmission. A detector (82) detects rotation speed of a main speed change output shaft (27) serving as an output shaft of the differential mechanism.
    Type: Grant
    Filed: March 22, 2004
    Date of Patent: May 2, 2006
    Assignees: Yanmar Agricultural Equipment Co., Ltd., Yanmar Co., Ltd.
    Inventors: Fumio Ishibashi, Yukio Kubota, Yasuo Noma, Akifumi Kuroda
  • Patent number: 6539710
    Abstract: A hydrostatic steering system of the type including a fluid controller (21) for controlling the flow of fluid from a source (11) to a steering actuator (19) in response to movement of a steering wheel (W). The controller (21) is of the type having a fluid meter (65) including a moveable star member (95), the movement of which corresponds to the flow of fluid to the actuator (19). The controller includes a sensor assembly (125) which senses the movement of the star member (95) and generates an electrical signal (127) representative of the fluid flow through the fluid meter (65).
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: April 1, 2003
    Assignee: Eaton Corporation
    Inventor: Don R. Draper
  • Patent number: 6378411
    Abstract: Operating side link members corresponding to working side link members of a working device are provided in a device for operating working equipment. Rotation of the working side link members is detected by a rotation sensor. A motor is driven in response to a signal from the rotation sensor. A differential detecting portion has a working side movable portion driven both in a forward direction and a reverse direction by the motor, an operating side movable portion that is shiftable both in the forward direction and the reverse direction within a range from a neutral position to the working side movable portion, and a differential sensor for detecting a relative shift from the neutral position of the operating side movable portion to the working side movable portion.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: April 30, 2002
    Assignee: Kabushiki Kaisha F.F.C.
    Inventor: Mitsuhiro Koseki
  • Patent number: 5097744
    Abstract: A hydraulic control system is provided for regulating the slew rate of a servovalve driven actuator within design parameters despite widely varying load conditions. The servovale flow is maintained constant in accord with the integration of the difference between a set slew rate command signal and a measured slew rate feedback signal. Where a plurality of such actuators are driven from a single hydraulic pump, this regulation of servovalve flow also enables the pump supply pressure to remain constant despite widely varying load conditions on the individual actuators in the system.
    Type: Grant
    Filed: January 14, 1991
    Date of Patent: March 24, 1992
    Assignee: General Electric Company
    Inventor: Edward J. Condrac
  • Patent number: 5035113
    Abstract: A remote control shifting system for a mechanical transmission. The transmission is operated by two pneumatic cylinders, a selecting cylinder operating in the direction of shift path selection and a shifting cylinder acting in the direction of shifting. The shifting cylinder operates with two force stages, a lower force for effecting synchronization of gears about to be engaged, and a higher force level for actually engaging or disengaging the selected gears. A remote shift control unit is designed to closely emulate the action of a direct-operating manual shift level. During the synchronizing phase, the shift lever moves easily in the shifting direction. After a preliminary movement, however, further movement is allowed only against considerable resistance, as if conventionally mechanically forcing gears into meshing engagement.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: July 30, 1991
    Assignee: Csepel Autogyar
    Inventors: Sandor Simonyi, Laszlo Torocsik, Istvan Toth, Gyorgy Valoczi
  • Patent number: 4800723
    Abstract: A flexible bellows connecting device which positions an output member has a pair of jacks (1,2) equipped with deformation sensors (12,13). A pair of variable capacity bellows pump reservoirs (3,4) permit predetermined motion of the jacks. An electric motor (19) drives the pump. The sensor signals provide deformation difference signal feedback to the electronic control system which may include a microprocessor (5) for closed loop position control.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: January 31, 1989
    Assignee: Centre National de la Recherche Scientifique
    Inventors: Jean Clot, Jean Falipou
  • Patent number: 4793137
    Abstract: A control system for airships and the like that incorporates optically encoded control signals and a compressed fluid power source to power a remote control station to decrease the susceptibility of the control system to uninterruption or disablement due to electromagnetic interference. The compressed fluid power source provides means of driving an electrical generator at a remote location to power the electrical portion of the control system at the remote location in addition to providing primary power for movement of the controlled devices.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: December 27, 1988
    Assignee: Airship Industries (UK) Limited
    Inventor: Jeffrey R. Munk
  • Patent number: 4731996
    Abstract: A position transmitter which can be incorporated in a pneumatic-pneumatic or electro-pneumatic converter, and which readily provides for calibration between a zero position and a maximum position of a device to be actuated by the converter. The invention also provides a virtually non-interacting zero and span or full scale adjustment, for ease of calibration.
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: March 22, 1988
    Assignee: The Babcock & Wilcox Company
    Inventors: Jane E. Smith, Raymond J. Sampson
  • Patent number: 4706456
    Abstract: A control system is provided for a hydraulic actuating system having a multi-phase stepping motor with a driver therefor which supplies and controls DC current through each of the motor windings such that no current is induced into the control winding from adjacent windings. The stepping motor precisely controls the rotation of an eccentric cam engaging an actuating plunger which actuates a control valve of the hydraulic actuating system. The driver receives control signals from a computer programmed to calculate, from user input command signals indicative of the desired system condition, and generate those control signals which most quickly achieve a rough approximation of the desired system condition. After this rough approximation is attained, the computer generates new control signals for the driver as a function of feedback signals and/or system component characteristics so as to precisely achieve the desired system condition.
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: November 17, 1987
    Assignee: South Bend Lathe, Inc.
    Inventors: Bengt S. Backe, La Moyne W. Durham
  • Patent number: 4696163
    Abstract: The valve disclosed herein functions as a flow matching device. By employing such a valve, hydraulic systems may be implemented in which filling and emptying of a variable volume load, such as a hydraulic piston, may be accomplished through simple check valve structures at controlled flow rates.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: September 29, 1987
    Assignee: REXA Corporation
    Inventor: J. Robert Glomeau
  • Patent number: 4680929
    Abstract: A working vehicle having a working device mounted on a swivel base rotated by a hydraulic motor. There is provided a control system which causes the swivel base to start and stop smoothly at highest possible standard speeds which are preset for an entire swivelling range.
    Type: Grant
    Filed: December 14, 1983
    Date of Patent: July 21, 1987
    Assignee: Kubota, Ltd.
    Inventors: Akihiko Mouri, Kazushige Ikeda
  • Patent number: 4667472
    Abstract: This invention relates to integrated electro-hydraulic actuators for use aboard aircraft or elsewhere. A balanced, double-acting hydraulic ram or motor (12) is connected between a support (16) and a member to be moved relative to the support. The ram includes first and second changeable volume hydraulic chambers (30, 32). A reversible hydraulic pump (38) is connected by a pair of conduits (44, 46) to the ram chambers (30, 32). The pump (38) displaces hydraulic fluid from one chamber to another for the purpose of causing a pressure differential between them. A hydraulic accumulator (60) provides leakage makeup fluid to the actuator, and further provides a quiescent pressure to the actuator when it is in a substantially nonoperative condition. A conduit (62) may connect the accumulator (60) to the ram (12). A laminar leakage flow path within the actuator permits hydraulic connection of the accumulator (60) to the ram (12) without use of valves.
    Type: Grant
    Filed: December 28, 1984
    Date of Patent: May 26, 1987
    Assignee: The Boeing Company
    Inventors: C. William Clay, Curtiss W. Robinson
  • Patent number: 4655689
    Abstract: An electronic control system for a variable displacement pump comprises apparatus for sensing the actual position of the displacement determinative element and the actual rotational speed of the pump cylinder block, and for producing representative signals which are combined to produce a signal indicative of actual output flow rate. The displacement determinative elements position and the cylinder rotational speed are sensed directly by sensors mounted within the housing of the pump. The speed sensor is disposed in close proximity to, and aligned with marks inscribed on, the outer surface of the rotatable cylinder block. The volumetric efficiency of the pump is also sensed by and used to determine the actual flow rate.
    Type: Grant
    Filed: September 20, 1985
    Date of Patent: April 7, 1987
    Assignee: General Signal Corporation
    Inventors: Robert C. Westveer, John K. Vandervoort
  • Patent number: 4625513
    Abstract: In the hydraulic system disclosed herein, a flow matching device is employed to implement a system in which filling, emptying and holding of a variable volume load, such as a hydraulic piston, may be accomplished at controlled flow rate by a hydraulic circuit including a flow matching control valve.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: December 2, 1986
    Assignee: REXA Corporation
    Inventor: J. Robert Glomeau
  • Patent number: 4590764
    Abstract: This disclosure pertains to a completely digital, electrically powered servo wherein the servo actuator is minutely incremented at a frequency proportional to the magnitude of an error binary number. The binary error is derived from the difference of a binary reference representing the commanded position of the actuator and a binary feedback representing the position of the actuator. The direction of each increment has the polarity which reduces the difference between the reference and feedback binary numbers. The power unit of the servo is electrohydraulic; however, the servo is entirely electrically controlled and powered. Hydraulic fluid is confined to the power unit where it serves as a link between two solenoid driven piston pumps, a common mode volume adjuster and a hydraulic actuator. The direction the actuator is incremented is dependent on which of the two solenoids the error polarity directs pulsed electrical power.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: May 27, 1986
    Inventor: Alfonso S. Escobosa
  • Patent number: 4587808
    Abstract: A control system for a hydraulic circuit having a variable displacement hydraulic pump, and an actuator driven by the pump, in which a pump control controls a displacement volume varying member of the pump based on an operating signal giving a command with respect to the position thereof and a detector signal indicative of the actual position thereof while restricting the operating speed of the member to a level below a predetermined maximum speed.
    Type: Grant
    Filed: March 30, 1982
    Date of Patent: May 13, 1986
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroshi Watanabe, Eiki Izumi, Yukio Aoyagi, Kazuo Honma, Kichio Nakajima
  • Patent number: 4542802
    Abstract: A control system is provided for a combine or other vehicle having an engine for driving both the ground wheels of the vehicle and at least one auxiliary mechanism, such as the crop-processing mechanisms of a combine. The engine is coupled to the ground wheels through a hydrostatic transmission, and the power takeoff for the auxiliary mechanism is located on the engine side of the transmission. A speed droop governor regulates the fuel input to the engine in response to changes in the engine speed. Transmission control means adjusts the setting of the hydrostatic transmission, and thus the load applied to the engine via the transmission, in response to changes in engine speed or another parameter that varies with engine load so as to control the speed changes effected by the droop governor.
    Type: Grant
    Filed: July 27, 1984
    Date of Patent: September 24, 1985
    Assignee: Woodward Governor Company
    Inventors: Daniel C. Garvey, Richard D. Fiolkoski
  • Patent number: 4537029
    Abstract: An electrohydraulic control system which includes first and second electrically controlled fully variable hydraulic pumps adapted to be driven by the vehicle engine. In the specific embodiment of the invention herein disclosed, the first pump is coupled to the steering and braking control valves, and the second pump is coupled to the bucket and hoist control valves. An electrically controlled poppet valve selectively interconnects the respective pump outputs. Operator-responsive controllers, namely a bucket/hoist joy-stick controller, a vehicle propulsion controller and a steering controller, provide associated electrical signals as respective functions of operator demand. Electrically operated valves control application of hydraulic fluid to the bucket and hoist drive mechanisms, and pressure and position sensors are connected to such valves and actuating mechanisms.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: August 27, 1985
    Assignee: Vickers, Incorporated
    Inventors: Rajamouli Gunda, Michael R. McCarty, Melvin A. Rode
  • Patent number: 4494911
    Abstract: An electronic closed loop piston pump servo control system including a swash plate within the pump housing which controls pump output as a function of its position about a rotational axis, means for altering the position of said swash plate, means for producing electric signals representative of the desired and actual swash plate angular positions, and means for comparing these signals and producing a control or error signal to the means for altering the swash plate position as a function of these signal differences. The means for producing electric signals representative of the actual swash plate position includes a rotary potentiometer mounted in the pump housing and directly connected to the swash plate along a common axis of rotation. This potentiometer produces a d.c. signal indicating the angular position of the swash plate on this common axis.
    Type: Grant
    Filed: April 29, 1983
    Date of Patent: January 22, 1985
    Assignee: General Signal Corporation
    Inventor: Duane J. Davis
  • Patent number: 4489551
    Abstract: A failure detection system for a hydraulic pump (1) having a displacement volume varying device (1a) and connected to at least one hydraulic actuator (4) to constitute a hydraulic circuit for driving the hydraulic actuator. The system includes means (7a, 7b) for sensing the discharge pressure of the pump, means (6) for detecting the value of shifting of the displacement volume varying device, means (5, 24) for closing the hydraulic circuit to block the flow of a hydraulic fluid through the circuit, starting means (9) for giving a command to start checking on the pump to see if it is normally functioning, and a control unit (2, 23, 28, 29) for performing checking on the pump to see if it is normally functioning. The control unit includes means (S-5, S-5') responsive to the command given by the starting means for giving a command to activate the closing means, data collecting means (S-11) for causing the displacement volume varying device to shift based on information (P.sub.a, P.sub.
    Type: Grant
    Filed: January 18, 1984
    Date of Patent: December 25, 1984
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroshi Watanabe, Eiki Izumi
  • Patent number: 4489552
    Abstract: An automatic neutral point detecting system for a hydraulic pump equipped with a displacement varying device capable of shifting both in a (+) direction and in a (-) direction and connected to at least one hydraulic actuator to form a hydraulic circuit to drive the hydraulic actuator. The system includes pressure sensors for sensing the port pressures of the hydraulic pump, a shifting detector for detecting the shifting of the displacement varying device, a closing device for closing the hydraulic circuit and blocking the flow of a hydraulic fluid, a start switch for giving a command to start detection of the neutral point of the hydraulic pump, and a control unit for detecting the neutral point of the hydraulic pump.
    Type: Grant
    Filed: October 4, 1983
    Date of Patent: December 25, 1984
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroshi Watanabe, Eiki Izumi
  • Patent number: 4461147
    Abstract: In the preferred form, the invention disclosed herein provides a single servo control valve to modulate the flow of control fluid to a servo mechanism of a variable displacement pump wherein the single valve is provided with both a manual primary input and an electro-hydraulic secondary input which modulates the primary input. The servo valve is spring biased toward a neutral position with the manual input displacement command being applied to such servo valve through a resilient linkage. Also applied to the servo valve is a hydraulic signal which is electrically controlled to modify the displacement of the servo valve relative to the yieldably applied manual input.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: July 24, 1984
    Assignee: Sundstrand Corporation
    Inventor: H. Allen Myers
  • Patent number: 4412500
    Abstract: A drive mechanism for ships or the like having at least one main propeller or the like drivable by at least one main motor and further having at least one drivable auxiliary mechanism, for example a maneuvering propeller. An energy producer is drivable by the main motor. A further motor is driven by the energy producer and arranged for driving the drivable auxiliary mechanism. An adjusting mechanism is provided for adjusting energy emitted by the energy producer or absorbed by the further motor. A regulator adjusts the adjusting mechanism to a preselected energy output. The main motor and the auxiliary mechanism are sized such that in the higher part of the speed range of the main motor, the sum of the energy required to drive the propulsion means at that speed and simultaneously drive the auxiliary mechanism at that speed exceed the output available from the main motor.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: November 1, 1983
    Assignee: Schottel-Werft, Josef Becker GmbH & Co. KG
    Inventor: Franz Krautkremer
  • Patent number: 4370856
    Abstract: An arrangement is described for controlling a winch used in mining machinery, wherein the direction of operating a winch and speed thereof are controlled by changing the position of a control element of a fluid pump for supplying a fluid into a fluid pressure recirculating circuit, by a device incorporating the fluid pressure recirculating circuit and a control circuit. The arrangement is characterized by feeding ON/OFF signals for giving instructions of a position to a control element, by a bi-polar pulse generator. Pulse from the bi-polar pulse generator are fed to a reversible BCD counter by pressing push buttons, and comparing a voltage generated via a D/A converting circuit from the reversible BCD counter with a voltage generated from a potentiometer coupled to the control element according to the position of the control element to be selected, thereby controlling the instruction of the position of the control element; and setting a speed of the winch by pressing the push buttons.
    Type: Grant
    Filed: August 12, 1980
    Date of Patent: February 1, 1983
    Assignee: Kabushiki Kaisha Mitsui Miike Seisakusho
    Inventors: Keishi Ito, Ryuji Yamada
  • Patent number: 4194361
    Abstract: To permit mechanical override of an electrical command system to control deflection of the swash plate or eccentricity of an axial or radial piston pump, for example upon failure of the electrical control system, a group of valves 5-8 are connected to an electrical control unit 23 and an additional control valve 4, 4' with a manual control lever 18', 30' is provided, the deflection of the swash plate 1 or eccenter ring 28 of the pump being sensed by a position transducer 22 moved by a linkage which includes the manual control lever. In normal operation, the manual control lever is maintained by spring pressure to deactivate the control valve but, under emergency conditions, the manual control lever will operate the first control valve 4, 4' to admit hydraulic control fluid to position the swash plate, or eccenter ring, respectively, the consequent movement of which is fed back through the linkage to the manual control lever.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: March 25, 1980
    Assignee: Robert Bosch GmbH
    Inventors: Arnold Pahl, Hans-Jurgen van der Kolk, Manfred Lixenfeld