EP0809737A1 - Electrohydraulic proportional control valve assemblies - Google Patents
Electrohydraulic proportional control valve assembliesInfo
- Publication number
- EP0809737A1 EP0809737A1 EP96903123A EP96903123A EP0809737A1 EP 0809737 A1 EP0809737 A1 EP 0809737A1 EP 96903123 A EP96903123 A EP 96903123A EP 96903123 A EP96903123 A EP 96903123A EP 0809737 A1 EP0809737 A1 EP 0809737A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- port
- valve
- fluid
- pressure
- actuating
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000000712 assembly Effects 0.000 title description 6
- 238000000429 assembly Methods 0.000 title description 6
- 239000012530 fluid Substances 0.000 claims abstract description 133
- 230000004044 response Effects 0.000 claims abstract description 22
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000013022 venting Methods 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 12
- 230000007935 neutral effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Definitions
- This invention relates to electrohydraulic proportional control valve
- Such a control valve assembly typically incorporates a main spool valve
- port as indicated by the directional signal is at the higher pressure, and provides an output signal to a positioning device for controlling the output of the pump in
- valve members to control the flow rate and/or pressure at the ports of a fluid actuated
- valve member position the sensed pressures in the ports and the sensed pump pressure
- valve members are continuously controlled by the servo
- control means in response to a continually updated actuating signal adapted to drive the
- control circuitry appropriate programming of the control circuitry.
- pressure at the ports of the fluid actuated device may be controlled so that the device is adjustable at a uniform rate which is independent of the load, that is so that the rate
- valve means thus enables operation of the fluid actuated device at a higher level
- FIG. 1 is a hydraulic circuit diagram of the assembly
- Figure 2 is a diagrammatic sectional view through a part of the assembly
- Figure 3 is a block diagram showing the electrical interconnections between
- Figure 4 is a logic diagram illustrating control functions of the assembly.
- valve assembly 1 comprises first and second spool valves 2 and 3 connected to first and
- second actuating ports 4 and 5 for controlling fluid flow to opposite sides of a movable piston 6 of a fluid actuated device 7 in the form of a hydraulic cylinder or motor.
- first and second spool valves 2 and 3 have spools 12 and 13 which are axially movable
- pilot actuator valves 44 and 45 The fluid supplied to the pilot actuator valves 44 and 45 is regulated by a pilot pressure regulator 14.
- the spool 12 or 13 or each spool valve 2 or 3 is movable to effect opening
- both spools 12 and 13 are spring biased towards their neutral positions (in which they are shown in Figure 1), and position sensors 23 and 24 are provided for supplying electrical position signals indicative of the positions
- a pressure relief valve 25 is provided for venting the output of the pump 17 to the tank 20 in a manner which will be described in more
- pressure sensors 26, 27, 28 and 29 are provided for supplying electrical pressure signals P A , P B , P s and P ⁇ indicative of the fluid pressures in the first
- pilot pressure regulator 14 may also serve to regulate pilot fluid supply to the pilot actuator
- valves of a further pair of spool valves identical to the spool valves 2 and 3, for controlling supply of fluid to a further fluid actuated device 30.
- 30 may be two rams for controlling different linkage axes of an earth moving vehicle
- Figure 2 shows a section through a valve slice part incorporating one of the
- or 45 comprises a moving coil 35 fixed to a pilot spool 36 which is centred by two springs 37 and 38, the coil 35 being displaceable in an annular air gap 39 within a
- the pilot actuator valve when a current is supplied to the coil 35 so as to provide magnetic interaction between the magnetic field associated with the current flow and the magnetic flux produced in the air gap 39 by the former 40.
- conduits 48 and 49 respectively, as well as a tank port 70 connected to the tank and two pump ports 71 and 72 connected to pump either directly or by way of the pilot pressure regulator 14.
- the spool 12 or 13 of the spool valve 2 or 3 is
- position sensor 23 or 24 indicates that the spool has been driven to the required position
- valve 44 or 45 is returned to its neutral position by the springs 37 and 38. This results in movement of the main spool 12 or 13 being stopped so that the spool is held in the required position to which it has been driven by virtue of the fluid pressures acting on
- pilot actuator valve current is controlled in a complex way by the control circuitry in order to achieve optimum dynamic and position control
- the moving coil 35 and the spool 36 to which it is fixed are of light construction, the coil 35 has low power consumption and the control circuitry requires
- spool 12 or 13 to tank be controlled rapidly so as to provide for accurate dynamic
- control of the piston 6 of the fluid actuated device 7 can be effected with response
- an appropriate pressure relief signal triggered by sensing of a
- the complete control valve assembly comprises, for
- a bank of two valve slices 50 and 51 of the general form described each of which has a first actuating port 4 and a second actuating port 5 for connection to a
- slice 52 serves to control the supply pressure of hydraulic fluid from a fixed displacement pump (not shown) connected to the pump port 53 in dependence on
- the pressure relief valve 25 routes the fluid back to the tank at a nominal low pressure.
- valve 25 may be
- valve slices 50 and 51 are shown in Figure 3 for simplicity, it should be appreciated
- the pressure in the port A is set to a nominal value, that is a predetermined pressure above the sensed or assumed tank pressure.
- a sine wave varying cyclic demand pressure is added
- valves for controlling the fluid flows to and from the main valve or valves in response
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9503854 | 1995-02-25 | ||
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 (3)
Publication Number | Publication Date |
---|---|
EP0809737A1 true EP0809737A1 (en) | 1997-12-03 |
EP0809737B1 EP0809737B1 (en) | 1999-06-16 |
EP0809737B2 EP0809737B2 (en) | 2007-09-19 |
Family
ID=10770283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96903123A Expired - Lifetime EP0809737B2 (en) | 1995-02-25 | 1996-02-22 | Electrohydraulic proportional control valve assemblies |
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) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004020840A1 (en) * | 2002-08-28 | 2004-03-11 | Bucher Hydraulics Gmbh | Hydraulic drive for a control valve |
FR2859252A1 (en) * | 2003-09-03 | 2005-03-04 | Sauer Danfoss Aps | VALVE DEVICE AND HYDRAULIC CONTROL UNIT |
EP1710446A2 (en) | 2005-04-05 | 2006-10-11 | Bosch Rexroth Aktiengesellschaft | Hydraulic control device and control block |
EP3306112A4 (en) * | 2015-06-01 | 2019-03-20 | Hitachi Construction Machinery Co., Ltd. | Construction-machine hydraulic control device |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0884482B1 (en) * | 1996-02-28 | 2005-01-05 | 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 |
EP1370773B1 (en) | 2001-03-21 | 2005-06-22 | Bucher Hydraulics GmbH | Control 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 |
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 |
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 |
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 |
EP2235270A1 (en) * | 2007-12-12 | 2010-10-06 | Volvo Construction Equipment AB | A 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 |
KR101901121B1 (en) * | 2010-11-08 | 2018-09-27 | 로베르트 보쉬 게엠베하 | Hydraulic or pneumatic drive for actuating a fitting comprising a control valve or selector valve |
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 |
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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 |
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- 1996-02-22 DK DK96903123T patent/DK0809737T4/en active
- 1996-02-22 JP JP8526084A patent/JPH11501106A/en not_active Withdrawn
- 1996-02-22 DE DE69602923T patent/DE69602923T3/en not_active Expired - Lifetime
- 1996-02-22 WO PCT/GB1996/000393 patent/WO1996027051A1/en active IP Right Grant
- 1996-02-22 CN CN96192050A patent/CN1070974C/en not_active Expired - Lifetime
- 1996-02-22 GB GB9603811A patent/GB2298291C/en not_active Expired - Lifetime
- 1996-02-22 EP EP96903123A patent/EP0809737B2/en not_active Expired - Lifetime
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Cited By (4)
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WO2004020840A1 (en) * | 2002-08-28 | 2004-03-11 | Bucher Hydraulics Gmbh | Hydraulic drive for a control valve |
FR2859252A1 (en) * | 2003-09-03 | 2005-03-04 | Sauer Danfoss Aps | VALVE DEVICE AND HYDRAULIC CONTROL UNIT |
EP1710446A2 (en) | 2005-04-05 | 2006-10-11 | Bosch Rexroth Aktiengesellschaft | Hydraulic control device and control block |
EP3306112A4 (en) * | 2015-06-01 | 2019-03-20 | Hitachi Construction Machinery Co., Ltd. | Construction-machine hydraulic control device |
Also Published As
Publication number | Publication date |
---|---|
EP0809737B1 (en) | 1999-06-16 |
DK0809737T3 (en) | 1999-11-22 |
JPH11501106A (en) | 1999-01-26 |
EP0809737B2 (en) | 2007-09-19 |
GB9503854D0 (en) | 1995-04-19 |
DE69602923D1 (en) | 1999-07-22 |
GB2298291C (en) | 2008-02-26 |
WO1996027051A1 (en) | 1996-09-06 |
CN1070974C (en) | 2001-09-12 |
GB9603811D0 (en) | 1996-04-24 |
DE69602923T2 (en) | 1999-12-09 |
KR100432381B1 (en) | 2004-09-16 |
WO1996027051B1 (en) | 2001-04-12 |
DK0809737T4 (en) | 2008-01-07 |
JP2006177561A (en) | 2006-07-06 |
DE69602923T3 (en) | 2008-05-21 |
CN1175988A (en) | 1998-03-11 |
GB2298291B (en) | 1998-06-10 |
GB2298291A (en) | 1996-08-28 |
KR19980702483A (en) | 1998-07-15 |
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