Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1986-12-22
1988-05-03
Wayner, William E.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60446, 60465, F16D 3102
Patent
active
047411597
ABSTRACT:
An electrohydraulic servo system which includes a plurality of pressure compensated flow control servo valves for feeding hydraulic fluid from a variable displacement pump to associated actuators and loads. A closed-loop velocity-control servo system is coupled to each servo valve, and is responsive to velocity command inputs from an operator and to feedback signals from the respective loads for providing flow control signals to the respective servo valves. A pump controller receives the valve flow control signals, derives associated valve flow rates from predetermined functional characteristics of the pressure compensated valves, and obtains a total flow demand as a function of the sum of the indicated individual valve flow rates. A pump displacement command is derived as a combined function of total flow demand and pump speed to accommodate volumetric inefficiencies which vary with speed, and the displacement command signal is fed to a pump displacement servo control loop for controlling pump output. Displacement command is limited as a function of power available at the engine coupled to the pump to prevent engine stall.
REFERENCES:
patent: 3748857 (1973-07-01), Heiser
patent: 4375747 (1983-03-01), Friedrich
patent: 4505111 (1985-03-01), Okamoto et al.
patent: 4507057 (1985-03-01), Igarashi et al.
Gunda Rajamouli
McCarty Michael R.
Rode Melvin A.
Vickers Incorporated
Wayner William E.
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