DK0809737T3 - Electrohydraulic proportional control valve designs - Google Patents

Electrohydraulic proportional control valve designs

Info

Publication number
DK0809737T3
DK0809737T3 DK96903123T DK96903123T DK0809737T3 DK 0809737 T3 DK0809737 T3 DK 0809737T3 DK 96903123 T DK96903123 T DK 96903123T DK 96903123 T DK96903123 T DK 96903123T DK 0809737 T3 DK0809737 T3 DK 0809737T3
Authority
DK
Denmark
Prior art keywords
control valve
proportional control
valve designs
electrohydraulic proportional
electrohydraulic
Prior art date
Application number
DK96903123T
Other languages
Danish (da)
Other versions
DK0809737T4 (en
Inventor
Stephen Brian Turner
David Franz Lakin
Original Assignee
Ultronics Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10770283&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DK0809737(T3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ultronics Limited filed Critical Ultronics Limited
Publication of DK0809737T3 publication Critical patent/DK0809737T3/en
Application granted granted Critical
Publication of DK0809737T4 publication Critical patent/DK0809737T4/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/167—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load using pilot pressure to sense the demand
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2025—Particular purposes of control systems not otherwise provided for
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3057—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having two valves, one for each port of a double-acting output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/634—Electronic controllers using input signals representing a state of a valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6654—Flow rate control

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Servomotors (AREA)
  • Fluid-Pressure Circuits (AREA)
DK96903123T 1995-02-25 1996-02-22 Electrohydraulic proportional control valve designs DK0809737T4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9503854.3A GB9503854D0 (en) 1995-02-25 1995-02-25 Electrohydraulic proportional control valve assemblies
PCT/GB1996/000393 WO1996027051A1 (en) 1995-02-25 1996-02-22 Electrohydraulic proportional control valve assemblies

Publications (2)

Publication Number Publication Date
DK0809737T3 true DK0809737T3 (en) 1999-11-22
DK0809737T4 DK0809737T4 (en) 2008-01-07

Family

ID=10770283

Family Applications (1)

Application Number Title Priority Date Filing Date
DK96903123T DK0809737T4 (en) 1995-02-25 1996-02-22 Electrohydraulic proportional control valve designs

Country Status (8)

Country Link
EP (1) EP0809737B2 (en)
JP (2) JPH11501106A (en)
KR (1) KR100432381B1 (en)
CN (1) CN1070974C (en)
DE (1) DE69602923T3 (en)
DK (1) DK0809737T4 (en)
GB (2) GB9503854D0 (en)
WO (1) WO1996027051A1 (en)

Families Citing this family (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1798346B1 (en) * 1996-02-28 2010-12-22 Komatsu Ltd. Control device for hydraulic drive machine
GB9717713D0 (en) * 1997-08-22 1997-10-29 Ultronics Limited An electrohydraulic proportional control valve assembly
US6202014B1 (en) * 1999-04-23 2001-03-13 Clark Equipment Company Features of main control computer for a power machine
DE50203452D1 (en) 2001-03-21 2005-07-28 Bucher Hydraulics Gmbh VALVE
US6763661B2 (en) 2002-05-07 2004-07-20 Husco International, Inc. Apparatus and method for providing vibration to an appendage of a work vehicle
AU2003259422A1 (en) * 2002-08-28 2004-03-19 Bucher Hydraulics Gmbh Hydraulic drive for a control valve
DE10259146A1 (en) * 2002-12-18 2004-07-15 Georg Sebode Lift with a hydraulic drive
DE10330869A1 (en) * 2003-07-09 2005-02-17 Hydac System Gmbh Hydraulic system
DE10340504B4 (en) * 2003-09-03 2006-08-24 Sauer-Danfoss Aps Valve arrangement for controlling a hydraulic drive
DE10340506B4 (en) 2003-09-03 2006-05-04 Sauer-Danfoss Aps Valve arrangement for controlling a hydraulic drive
DE10340505B4 (en) * 2003-09-03 2005-12-15 Sauer-Danfoss Aps Valve arrangement for controlling a hydraulic drive
DE10344480B3 (en) 2003-09-24 2005-06-16 Sauer-Danfoss Aps Hydraulic valve arrangement
DE102004050294B3 (en) 2004-10-15 2006-04-27 Sauer-Danfoss Aps Hydraulic valve arrangement
KR100641393B1 (en) 2004-12-07 2006-11-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic control circuit and method thereof
DE102005022891A1 (en) 2005-04-05 2006-10-12 Bosch Rexroth Aktiengesellschaft Hydraulic control arrangement and control block
DE102005045035B4 (en) * 2005-09-21 2007-07-12 Wessel-Hydraulik Gmbh Hydraulic circuit arrangement for supplying a double-acting hydraulic consumer
CN100370149C (en) * 2006-01-24 2008-02-20 东北大学 Constant backpressure and proportion controlled sinter apparatus HAGC System
JP4703419B2 (en) * 2006-01-31 2011-06-15 カヤバ工業株式会社 Control circuit for hydraulic actuator
US7487707B2 (en) 2006-09-27 2009-02-10 Husco International, Inc. Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve
DE102007048697A1 (en) * 2007-10-11 2009-04-16 Deere & Company, Moline Hydraulic lifting device
US8695333B2 (en) 2007-12-12 2014-04-15 Volvo Construction Equipment Ab Method for when necessary automatically limiting a pressure in a hydraulic system during operation
DE102008002422A1 (en) * 2008-06-13 2009-12-17 Zf Friedrichshafen Ag Hydraulic supply system for supplying a hydraulic consumer with at least one consumption range
US8359849B2 (en) * 2009-04-07 2013-01-29 Eaton Corporation Control of a fluid circuit using an estimated sensor value
DE102009033645A1 (en) * 2009-07-17 2011-01-20 Robert Bosch Gmbh Hydraulic control arrangement
GB2472004A (en) * 2009-07-20 2011-01-26 Ultronics Ltd Control arrangement for controlling movement of a differential piston in a hydraulic circuit
US8291925B2 (en) 2009-10-13 2012-10-23 Eaton Corporation Method for operating a hydraulic actuation power system experiencing pressure sensor faults
US8375989B2 (en) * 2009-10-22 2013-02-19 Eaton Corporation Method of operating a control valve assembly for a hydraulic system
CN103370546B (en) * 2010-11-08 2018-06-26 罗伯特·博世有限公司 For to having the hydraulic pressure or pneumatic driving device that the valve of adjusting or distributing valve manipulated
US8857168B2 (en) 2011-04-18 2014-10-14 Caterpillar Inc. Overrunning pump protection for flow-controlled actuators
DE102011114241B4 (en) * 2011-06-09 2014-09-04 Sms Meer Gmbh Hydraulic drive device, hydraulic output stage of a hydraulic servo-control valve, servo-control valve and powder press
CN102536194B (en) * 2011-12-13 2014-05-28 中国石油集团长城钻探工程有限公司 Hydraulic drive's automatic control system that send of constant weight of boring
CN102535571A (en) * 2012-02-17 2012-07-04 上海三一重机有限公司 System and method of regeneration control based on double spools for hydraulic excavator
CN102587443A (en) * 2012-02-23 2012-07-18 上海三一重机有限公司 Multiway valve hydraulic control system of crawler excavator
CN102678663B (en) * 2012-05-30 2015-05-20 上海三一重机有限公司 Oil cylinder for excavator and excavator with cylinder
US9145660B2 (en) * 2012-08-31 2015-09-29 Caterpillar Inc. Hydraulic control system having over-pressure protection
CN102888873B (en) * 2012-09-12 2015-03-11 徐州徐工挖掘机械有限公司 Device for improving linear running performance of excavator during compound action
CN103122648B (en) * 2012-12-28 2015-06-17 上海三一重机有限公司 Multi-way valve hydraulic control system, rectilinear walking control valve and excavator
CN103256334B (en) * 2013-04-28 2016-06-22 潍坊威度电子科技有限公司 Double-act-ing hydraulic J-Horner tractor suspension hydraulic system based on electromagnetic digital valve
DK2811174T3 (en) 2013-06-04 2020-10-12 Danfoss Power Solutions Aps Steering arrangement for a hydraulic system and a method for controlling a hydraulic system
US8977445B2 (en) * 2013-06-18 2015-03-10 Caterpillar Inc. System and method for dig detection
CN103644172B (en) 2013-12-20 2015-12-30 徐州重型机械有限公司 A kind of telescopic oil cylinder of crane detects and protective gear and method
CN104564863B (en) * 2014-12-26 2017-02-22 大连理工大学 Electrohydraulic control system for rotation motion of pipe splicing machine
JP6324347B2 (en) * 2015-06-01 2018-05-16 日立建機株式会社 Hydraulic control equipment for construction machinery
WO2017061648A1 (en) * 2015-10-08 2017-04-13 볼보 컨스트럭션 이큅먼트 에이비 Spool valve
US9713307B1 (en) 2016-01-21 2017-07-25 Deere & Company Electrohydraulic dynamic spool position control for a proportional valve in a work vehicle
CN105862962B (en) * 2016-05-31 2018-05-18 青岛雷沃工程机械有限公司 Reduce the hydraulic circuit of return oil pressure
US10330126B2 (en) 2016-12-16 2019-06-25 Caterpillar Inc. Fan control system with electro-hydraulic valve providing three fan motor operational positions
CN107387477B (en) * 2017-07-20 2018-11-06 徐州工业职业技术学院 A kind of leading controller for guiding valve, hydraulic cylinder control loop
WO2019157429A1 (en) * 2018-02-12 2019-08-15 Parker-Hannifin Corporation Hydraulic control valve configured to use a pilot signal as a substitute load-sense signal
LT4218378T (en) * 2018-03-08 2024-06-25 Precision Planting Llc An agricultural planter row unit with a fluid control system
CN108953306B (en) * 2018-08-26 2021-01-08 燕山大学 Direct-drive type volume control electro-hydraulic servo control system of duplex pump
CN108868793B (en) * 2018-09-17 2023-09-01 中国铁建重工集团股份有限公司 Shield constructs owner and drives high-pressure sealing system and slurry balance shield constructs machine
EP3670931A1 (en) * 2018-12-17 2020-06-24 Hyva Holding BV A hydraulic control system
JP7400552B2 (en) * 2020-03-06 2023-12-19 コベルコ建機株式会社 Hydraulic drive system for working machines
CN112096670A (en) * 2020-09-21 2020-12-18 广东海德利森一氢科技有限公司 Hydraulic system and hydraulic pressure control method
JP2022124642A (en) * 2021-02-16 2022-08-26 株式会社小松製作所 Boom control system of work machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US33846A (en) * 1861-12-03 Improved mode of heating molds
EP0038128A1 (en) * 1980-04-04 1981-10-21 General Signal Corporation Electro-hydraulic servo activator system
DE3347000A1 (en) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Electrohydraulic arrangement for controlling a double-acting hydraulic motor
JP2828490B2 (en) * 1990-06-19 1998-11-25 日立建機株式会社 Load sensing hydraulic drive circuit controller
US5138838A (en) * 1991-02-15 1992-08-18 Caterpillar Inc. Hydraulic circuit and control system therefor
DE4122164C1 (en) * 1991-07-04 1993-01-14 Danfoss A/S, Nordborg, Dk
JPH05256303A (en) * 1992-01-15 1993-10-05 Caterpillar Inc Hydraulic control apparatus

Also Published As

Publication number Publication date
EP0809737B1 (en) 1999-06-16
DE69602923T2 (en) 1999-12-09
EP0809737B2 (en) 2007-09-19
GB2298291A (en) 1996-08-28
CN1070974C (en) 2001-09-12
WO1996027051B1 (en) 2001-04-12
KR100432381B1 (en) 2004-09-16
GB2298291C (en) 2008-02-26
JPH11501106A (en) 1999-01-26
CN1175988A (en) 1998-03-11
DE69602923T3 (en) 2008-05-21
GB2298291B (en) 1998-06-10
DE69602923D1 (en) 1999-07-22
JP2006177561A (en) 2006-07-06
GB9503854D0 (en) 1995-04-19
KR19980702483A (en) 1998-07-15
WO1996027051A1 (en) 1996-09-06
EP0809737A1 (en) 1997-12-03
DK0809737T4 (en) 2008-01-07
GB9603811D0 (en) 1996-04-24

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