Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1989-02-09
1990-06-19
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60452, 417222, 13762564, 91417R, 91506, F16H 3946, F15B 13043, F16K 31124
Patent
active
049341430
ABSTRACT:
An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to an electrohydraulic valve for metering hydraulic fluid to a pump control port and thereby controlling pump operation in any one of a number of preselected and prestored pump control modes. A hydromechanical valve is connected in parallel with the electrohydraulic valve for controlling pump operation in the event of electrical malfunction or failure. Circuitry connected between the pump condition sensors and the control computer prevents aliasing errors due to mismatch between the computer sampling frequency and pump speed.
REFERENCES:
patent: 3556154 (1971-01-01), Kramer
patent: 3774641 (1973-11-01), Mindner et al.
patent: 3990235 (1976-11-01), Bauchet
patent: 4094144 (1978-06-01), Italy et al.
patent: 4468173 (1984-08-01), Dantlgraber
patent: 4571920 (1986-02-01), Wuchenauer
Ezell Larry O.
Schmid John
Tovey Peter
Garrett Robert E.
Kapsalas George
Vickers Incorporated
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