KR920001091A - 로드센싱유압구동회로의 제어장치 - Google Patents

로드센싱유압구동회로의 제어장치 Download PDF

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KR920001091A
KR920001091A KR1019910010039A KR910010039A KR920001091A KR 920001091 A KR920001091 A KR 920001091A KR 1019910010039 A KR1019910010039 A KR 1019910010039A KR 910010039 A KR910010039 A KR 910010039A KR 920001091 A KR920001091 A KR 920001091A
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South Korea
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flow rate
valve
hydraulic pump
required flow
hydraulic
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KR1019910010039A
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English (en)
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KR940008822B1 (ko
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에이끼 이즈미
히로시 와다나베
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오까다 하지메
히다찌 겐끼 가부시기가이샤
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    • 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
    • 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
    • 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
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps 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
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single 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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in 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
    • F15B2211/50—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
    • F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure 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
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid 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
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • F15B2211/633—Electronic controllers using input signals representing a state of the prime mover, e.g. torque or rotational speed
    • 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
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Abstract

내용 없음.

Description

로드센싱유압구동회로의 제어장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본원 발명의 제1의 실시예에 의한 제어장치를 구비한 로드센싱유압구동회로의 개략도.
제2도는 사판위치제어장치의 개략도.
제3도는 제어유니트의 개략도.
제4도는 제어유니트에서 행해지는 제어수순을 도시한 플로차트.
제5도는 제4도의 플로차트에 있어서의 유압펌프의 사판목표위치를 연산하는 수순의 상세를 도시한 플로차트.
제6도는 제4도의 플로차트에 있어서의 유압펌프의 사판위치를 제어하는 수순의 상세를 도시한 플로차트.
제7도는 사판목표위치와 제어력과의 관계를 도시한 도면.
제8도는 사판목표위치와 언로드밸브의 설정치와의 관계를 도시한 도면.
제9도는 본 실시예의 제어수순을 정리하여 도시한 블록도.
제10도는 본원 발명의 제2의 실시예에 의한 제어장치를 구비한 로드센싱유압구동회로의 개략도.
제11도는 제2의 실시예의 언로드밸브의 설정치의 제어을 도시한 블록도.
제12도는 본원 발명의 제3의 실시예에 의한 제어장치를 구비한 로드센싱유압구동회로의 개략도.
제13도는 제3의 실시예에 있어서의 사판목표위치와 제어력과의 관계를 도시한 도면.
제14도는 본원 발명의 제4의 실시예에 의한 제어장치를 구비한 로드센싱유압구동회로의 개략도.
제15도는 제4의 실시예에 의한 제어를 도시한 블록도.

Claims (8)

  1. 배기용적가변수단을 구비한 최소한 1대의 유압펌프와, 이 유압펌프로부터 토출되는 압유에 의해 구동되는 최소한 하나의 유압액튜에이터와, 유압펌프와 액튜에이터의 사이에 접속되고, 액튜에이터에 공급되는 압유의 유량을 제어하는 유량제어밸브와, 상기 유압펌프의 토출압력이 상기 액튜에이터의 부하압력보다 제1의 소정치만큼 높아지도록 상기 유압펌프의 토출량을 제어하는 펌프제어수단과, 상기 유압펌프와 상기 유압펌프와 상기 액튜에이터의 사이에 접속되고, 상기 유압펌프의 토출압력과 상기 액튜에이터의 부하압력과의 차압을 제2소정치 이하로 유지하는 언로드밸브를 구비한 로드센싱유압 구동회로의 제어장치에 있어서, 상기 유량제어밸브의 요구유량에 관한 값을 검출하는 제1의 수단과, 상기 제1의 수단으로 검출한 요구유량에 관한 값에 따라서, 요구유량이작을 때에는 상기 제2의 소정치가 상기 제1의 소정치보다 작고, 요구유량이 증가함에 따라서 상기 제2의 소정치가 상기 제1의 소정치보다 커지도록 상기 언로드밸브를 제어하는 제2의 수단을 구비하는 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  2. 제1항에 있어서, 상기 펌프제어수단은 상기 유압펌프의 토출압력과 상기 액튜에이터의 부하압력과의 차압에 따라서, 그 차압을 상기 제1의 소정치로 유지하는 목표배기용적을 결정하는 제3의 수단과, 상기 유압펌프의 배기용적이 상기 제3의 수단으로결정한 목표배기용적에 일치하도록 상기 유압펌프의 배기용적가변수단을 제어하는 제4의 수단을 포함하고, 상기 제1의 수단을 상기 요구유량에 관한 값으로서 상기 제3의 수단으로 결정한 목표배기용적을 검출하는 수단을 구비하고, 상기 제2의 수단은 이 목표배기용적에 따라서 상기 언로드밸브를 제어하는 수단을 구비하는 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  3. 제1항에 있어서, 상기 제1의 수단은 상기 요구량에 관한 값으로서 상기 유압펌프의 실제의 배기용적을 검출하는 수단을 구비하고, 상기 제2의 수단은 이 배기용적에 따라서 상기 언로드밸브를 제어하는 수단을 구비하는 것을 특징으로 하는 로드센싱유압구동회로의 제아장치.
  4. 제1항에 있어서, 상기 제1의 수단은 상기 요구유량에 관한 값으로서 상기 유량제어밸브의 조작량을 검출하는 수단을 구비하고, 상기 제2의 수단은 이 조작량에 따라서 상기 언론드밸브를 제어하는 수단을 구비하는 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  5. 제1항에 있어서, 상기 유압펌프로부터 토출되는 압유에 의해 구동되는 복수의 유압액튜에이터와, 유압펌프와 복수의 액튜에이터간에 각각 접속되고, 액튜에이터에 공급되는 압유의 유량을 제어하는 복수의 유량제어밸브를 구비하고, 상기 제1의 수단은 상기 요구유량에 관한 값으로서 상기 복수의 유량제어밸브의 각각의 조작량을 검출하는 수단과, 이 검출된 조작량의 합계치를 연산하는 수단을 구비하고, 상기 제2의 수단은 이 조작량의 합계치에 따라서, 상기 언로드밸브를 제어하는 수단을 구비하는 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  6. 제1항에 있어서, 상기 제2의 수단을 상기 제1의 수단으로 검출한 요구유량에 관한 값에 따라서, 요구유량이 작을 때에는 상기 제2의 소정치를 상기 제1의 소정치보다 작게 하고, 요구유량이 증가함에 따라서 상기 제2의 소정치를 상기 제1의 소정치보다 크게 하는 제어력을 연산하고, 그것에 대응하는 전기신호를 출력하는 수단과, 상기 전기신호를 받아서, 상기 제어력을 생성하는 수단을 포함한 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  7. 제1항에 있어서, 상기 언로드밸브는 밸브폐쇄방향의 부세력을 가하는 스프링과, 밸브개방방향의 제어력을 가하는 구동수단을 가지고, 상기 제2의 수단은 상기 제1의 수단으로 검출한 요구요량에 관한 값에 따라서, 요구유량이 작을 때는 크고, 요구유량이 증가함에 따라서 작아지는 제어력을 결정하는 수단과, 상기 언로드밸브의 구동수단에 상기 제어력을 생성하는 수단을 포함하는 것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
  8. 제1항에 있어서, 상기 언로드밸브는 밸브폐쇄방향의 제어력을 가하는 구동수단을 가지고, 상기 제2의 수단은 상기 제1의 수단으로 검출한 요구유량에 관한 값에 따라서, 요구유량이 작을 때에는 작고, 요구유량이 증가함에 따라서 커지는 제어력을 결정하는 수단과, 상기 언로드밸브의 구동수단에 상기 제어력을 생성하는 수단을 포함하는것을 특징으로 하는 로드센싱유압구동회로의 제어장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019910010039A 1990-06-19 1991-06-18 로드센싱유압구동회로의 제어장치 KR940008822B1 (ko)

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DE69108787T2 (de) 1995-09-07
JPH0450504A (ja) 1992-02-19
JP2828490B2 (ja) 1998-11-25
EP0462589A2 (en) 1991-12-27
EP0462589A3 (en) 1992-05-27
DE69108787D1 (de) 1995-05-18
KR940008822B1 (ko) 1994-09-26
EP0462589B1 (en) 1995-04-12

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