Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1982-07-23
1986-05-06
Jordan, Charles T.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60422, 60427, 60428, 60465, 60469, F16H 5946
Patent
active
045863300
ABSTRACT:
A control system for a hydraulic circuit including at least first and second variable displacement volume type hydraulic pumps, at least first and second hydraulic actuators driven by the pumps, and valves for controlling hydraulic connections between the pumps and the actuators. The control system includes a device for deciding the order of priority of hydraulic connections between the first actuator and the first and second hydraulic pumps and the order of priority of hydraulic connections between the second pump and the first and second actuators. A first sensor is provided for sensing maximization of the displacement volume of the first pump, sensing that the displacement volume of the second pump has become substantially zero. A device decides target displacement volumes of the first and second pumps based on information supplied at least by the priority order deciding device and first and second sensor. When the flow rate of hydraulic fluid supplied to the first actuator is increased, the displacement volume of the second pump is increased from substantially zero after the displacement volume of the first pump is maximized. When the flow rate of hydraulic fluid supplied to the first actuator is reduced, the displacement volume of the first pump is reduced after the displacement volume of the second pump has become substantially zero.
REFERENCES:
patent: 3060858 (1962-10-01), Shoosmith
patent: 4113054 (1978-09-01), Myers
patent: 4369625 (1983-01-01), Izumi et al.
patent: 4395199 (1983-07-01), Izumi et al.
patent: 4399653 (1983-08-01), Pylat, Jr.
Aoyagi Yukio
Honma Kazuo
Izumi Eiki
Nakajima Kichio
Watanabe Hiroshi
Hitachi Construction Machinery Co. Ltd.
Jordan Charles T.
Klein Richard
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