Control system for hydraulic circuit

Details Control system for hydraulic circuit Control system for hydraulic circuit

1986-02-03

1988-01-12

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91448, 91459, 91461, F15B 1108

Patent

active

047183292

ABSTRACT:
A control system for a hydraulic circuit having an on-off valve interposed between the control valve and the actuator for allowing and blocking a flow of hydraulic fluid therebetween in which the control valve and on-off valves are actuated and switched in accordance with an operation signal from an operation device. Pressure sensors are connected to hydraulic lines upstream and downstream of the on-off valves for detecting the pressures in these hydraulic lines, and control unit is operative to calculate, based on the pressures detected by the pressure sensors, a value which reduces the difference between thrusts applied to the actuator and output the calculated value to the control valve while the on-off valves are closed to thereby perform pressure matching control.

REFERENCES:
patent: 4240327 (1980-12-01), Held
patent: 4336590 (1982-06-01), Jacq et al.
patent: 4417312 (1983-11-01), Cronin et al.
patent: 4595342 (1986-06-01), Christlieb et al.
European Patent Application EP-A-O 068 197 filed Jun. 1982.

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