Power plants – Pressure fluid source and motor – Full range correspondence of position of external...
Patent
1982-03-30
1986-05-13
Look, Edward K.
Power plants
Pressure fluid source and motor
Full range correspondence of position of external...
60390, 60911, 318311, 318590, F16D 3102
Patent
active
045878080
ABSTRACT:
A control system for a hydraulic circuit having a variable displacement hydraulic pump, and an actuator driven by the pump, in which a pump control controls a displacement volume varying member of the pump based on an operating signal giving a command with respect to the position thereof and a detector signal indicative of the actual position thereof while restricting the operating speed of the member to a level below a predetermined maximum speed. The control system has maximum speed setting device previously setting a first predetermined maximum speed and a second predetermined maximum speed higher than the first predetermined maximum speed for the operating speed of the variable displacement volume varying member and operative to select the first predetermined maximum speed when the direction of operation of the actuator commanded by the operating signal agrees with the actual direction of operation thereof, and select the second predetermined maximum speed when the position of the displacement volume varying member commanded by the operating signal is neutral or when the direction of operation of the actuator commanded by the operating signal is opposite to the actual direction of operation thereof. The pump control is constructed to effect the speed control of the displacement volume varying member based on the first or second predetermined maximum speed selected by the maximum speed setting device.
REFERENCES:
patent: 4369625 (1983-01-01), Izumi et al.
Aoyagi Yukio
Honma Kazuo
Izumi Eiki
Nakajima Kichio
Watanabe Hiroshi
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
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