WO1996027051B1 - Electrohydraulic proportional control valve assemblies - Google Patents

Electrohydraulic proportional control valve assemblies

Info

Publication number
WO1996027051B1
WO1996027051B1 PCT/GB1996/000393 GB9600393W WO9627051B1 WO 1996027051 B1 WO1996027051 B1 WO 1996027051B1 GB 9600393 W GB9600393 W GB 9600393W WO 9627051 B1 WO9627051 B1 WO 9627051B1
Authority
WO
WIPO (PCT)
Prior art keywords
port
valve
fluid
actuating
fluid flow
Prior art date
Application number
PCT/GB1996/000393
Other languages
French (fr)
Other versions
WO1996027051A1 (en
Inventor
Stephen Brian Turner
David Franz Lakin
Original Assignee
Ultra Hydraulics Ltd
Stephen Brian Turner
David Franz Lakin
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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1996027051(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ultra Hydraulics Ltd, Stephen Brian Turner, David Franz Lakin filed Critical Ultra Hydraulics Ltd
Priority to EP96903123A priority Critical patent/EP0809737B2/en
Priority to DK96903123T priority patent/DK0809737T4/en
Priority to DE69602923T priority patent/DE69602923T3/en
Priority to JP8526084A priority patent/JPH11501106A/en
Publication of WO1996027051A1 publication Critical patent/WO1996027051A1/en
Publication of WO1996027051B1 publication Critical patent/WO1996027051B1/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)

Abstract

An electrohydraulic proportional control valve assembly (1) for controlling a bidirectional fluid actuated device (7) has a first actuating port (4) for bidirectional fluid flow between the assembly and a first port of the device (7), a second actuating port (5) for bidirectional fluid flow between the assembly and a secondport of the device (7), a pump port (15, 16) for input fluid flow from a pump (17), and a tank port (18, 19) for output fluid flow from a tank (20). The assembly (1) comprises a first spool valve (2) connected to the first actuating port (4), the pump port (15, 16) and the tank port (18, 19) for controlling the direction and rate of fluid flow to and from the first port of the device (7), and a second spool valve (3) connected to the second actuating port (5), the pump port (15, 16) and the tank port (18, 19) and operable independently of the first pool valve 2 for controlling the direction and rate of fluid flow to and from the second port of the device (7). A position sensing arrangement (23, 24) is provided for supplying electrical position signals indicative of the actual positions of the spools (12, 13) of the first and second spool valves (2, 3) and a pressure sensing arrangement (26, 27, 28 and 29) is provided for supplying electrical pressure signals indicative of the fluid pressures in the first and second actuating ports (4, 5), the pump port (15, 16) and the tank port (18, 19). A servo control (not shown) controls the positions of the first and second spools (2, 3) in dependence on the electrical position and pressure signals and in response to an electrical demand signal provided in response to operator actuation, in order to set the throughflow cross sections for fluid flow to effect the required control of the device (7).

Claims

AMENDED CLAIMS[received by the International Bureau on 9 September 1996 (09.09.96); original claim 1 amended; remaining claims unchanged (2 pages)]
1. An electrohydraulic proportional control valve assembly for controlling a bidirectional fluid actuated device having first and second ports and a movable part disposed between the first and second ports to be acted on on opposite sides by fluid supplied to the first port and by fluid supplied to the second port, the valve assembly having a first actuating port for bidirectional fluid flow between the valve assembly and the first port of the fluid actuated device, a second actuating port for bidirectional fluid flow between the valve assembly and the second port of the fluid actuated device, a pump port for input fluid flow to the valve assembly from a hydraulic pump, and a tank port for output fluid flow from the valve assembly to a hydraulic tank, the valve assembly comprising first valve means connected to the first actuating port, the pump port and the tank port for controlling the direction and rate of fluid flow between the firsj actuating port and the pump port and between the first actuating port and the tank port, and second valve means connected to the second actuating port, the pump port and the tank port for controlling the direction and rate of fluid flow between the second actuating port and the pump port and between the second actuating port and the tank port, the first valve means having a first valve member which is movable to vary the throughflow cross-section for fluid flow between the first actuating port and the pump or tank port, and the second valve means having a second valve member which is movable, independently of movement of the first valve member, to vary the throughflow cross-section for fluid flow between the second actuating port and the pump or tank port, position sensing means for supplying electrical position signals indicative of the actual positions of the first and second valve members, pressure sensing means for supplying electrical pressure signals indicative of the fluid pressures in the first and second actuating ports and the pump port, and servo control means for controlling the positions of the first and second valve members in dependence on the electrical position and pressure signals and in response to an electrical demand signal provided in response to operator actuation, in order to set the throughflow cross- sections for fluid flow through the first and second valve means between the first actuating port and the pump or tank port and between the second actuating port and the pump or tank port to effect the required control of the movable part of the fluid actuated device.
2. An assembly according to claim 1, wherein the first and second valve members are spools which are axially displaceable to vary the throughflow cross- section for fluid flow between each actuating port and the pump or tank port.
3. An assembly according to claim 1 or 2, wherein the servo control means includes electrically operable pilot valve means for controlling the position of each of the valve members by applying a controlled displacement flow of pilot fluid to one part of the valve member, whilst at the same time applying controlled venting of pilot fluid from another part of the valve member, sufficient to drive the valve member to a required position in a first operating mode, and by subsequently discontinuing said displacement flow of pilot fluid to the valve member and said venting of pilot fluid so as to hold the valve member in said required position in a second operating mode.
4. An assembly according to claim 3, wherein the pilot valve means comprises a first pilot valve for effecting bidirectional axial movement of the first valve member, STATEMENT UNDER ARTICLE 19( 1)
Claim 1 has been amended so as to emphasise that the control valve assembly controls a bidirectional fluid actuated device having first and second ports, to which the first and second actuating ports of the valve assembly are connected, positioned so that fluid supplied by way of the first port acts on the opposite side of a movable part of the device to fluid supplied by way of the second port. Thus clearly the position of the movable part is controllable by control of the fluid flow to and from the first port of the device by the first valve means and independent control of the fluid flow to and from the second port by the second valve means. Such independent control of the fluid flows through the first and second ports of the device allows for greater operational efficiency and safety as compared with known arrangements, such as those referred to in cited EP-A-0462589 and US-A-5305681, in which the fluid supply through both ports of a bidirectional fluid actuated device is controlled by a single control valve.
The control valve assembly incorporates a servo control arrangement for controlling the positions of the valve members of the first and second valve means in dependence on electrical position signals indicative of the actual positions of the valve members, pressure signals indicative of the fluid pressures in the first and second ports and the pump port, and an electrical demand signal supplied by the operator. This allows for precise and continuously updated control of the positions of the valve members so as to accurately control the fluid pressure conditions at the two ports in accordance with operator demand and the desired operating mode of the device. For example, the movable part of the device may be adjustable at a uniform rate which is independent of load and which is not affected by variation of the applied load or supplied pressure, either in a passive load condition or in an over-running load condition.
PCT/GB1996/000393 1995-02-25 1996-02-22 Electrohydraulic proportional control valve assemblies WO1996027051A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96903123A EP0809737B2 (en) 1995-02-25 1996-02-22 Electrohydraulic proportional control valve assemblies
DK96903123T DK0809737T4 (en) 1995-02-25 1996-02-22 Electrohydraulic proportional control valve designs
DE69602923T DE69602923T3 (en) 1995-02-25 1996-02-22 ELECTROHYDRAULIC PROPORTIONAL CONTROL VALVE DEVICE
JP8526084A JPH11501106A (en) 1995-02-25 1996-02-22 Electro-hydraulic proportional control valve assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9503854.3 1995-02-25
GBGB9503854.3A GB9503854D0 (en) 1995-02-25 1995-02-25 Electrohydraulic proportional control valve assemblies

Publications (2)

Publication Number Publication Date
WO1996027051A1 WO1996027051A1 (en) 1996-09-06
WO1996027051B1 true WO1996027051B1 (en) 2001-04-12

Family

ID=10770283

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/000393 WO1996027051A1 (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)

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CN1070974C (en) 2001-09-12
GB2298291C (en) 2008-02-26
GB9503854D0 (en) 1995-04-19
DE69602923T2 (en) 1999-12-09
EP0809737A1 (en) 1997-12-03
GB2298291A (en) 1996-08-28
JP2006177561A (en) 2006-07-06
DE69602923D1 (en) 1999-07-22
KR100432381B1 (en) 2004-09-16
KR19980702483A (en) 1998-07-15
GB2298291B (en) 1998-06-10
DE69602923T3 (en) 2008-05-21
GB9603811D0 (en) 1996-04-24
CN1175988A (en) 1998-03-11
EP0809737B2 (en) 2007-09-19
WO1996027051A1 (en) 1996-09-06
JPH11501106A (en) 1999-01-26
EP0809737B1 (en) 1999-06-16
DK0809737T4 (en) 2008-01-07
DK0809737T3 (en) 1999-11-22

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