Power plants – Pressure fluid source and motor – Full range correspondence of position of external...
Patent
1982-09-23
1985-08-27
Jordan, Charles T.
Power plants
Pressure fluid source and motor
Full range correspondence of position of external...
60421, 60422, 60429, 60430, 60446, 60452, 91363R, 91513, 91516, 91517, 91518, F15B 909, F16H 3946
Patent
active
045370290
ABSTRACT:
An electrohydraulic control system which includes first and second electrically controlled fully variable hydraulic pumps adapted to be driven by the vehicle engine. In the specific embodiment of the invention herein disclosed, the first pump is coupled to the steering and braking control valves, and the second pump is coupled to the bucket and hoist control valves. An electrically controlled poppet valve selectively interconnects the respective pump outputs. Operator-responsive controllers, namely a bucket/hoist joy-stick controller, a vehicle propulsion controller and a steering controller, provide associated electrical signals as respective functions of operator demand. Electrically operated valves control application of hydraulic fluid to the bucket and hoist drive mechanisms, and pressure and position sensors are connected to such valves and actuating mechanisms. An electronic controller receives inputs indicative of operator demands, pump outputs, and operation at the hoist and bucket, and selectively controls or modulates the cartridge valve, the pumps, and the hoist and bucket valves for operation at optimum efficiency.
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Gunda Rajamouli
McCarty Michael R.
Rode Melvin A.
Jordan Charles T.
Klein Richard
Vickers Incorporated
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