Electrohydraulic and hydromechanical valve system for dual-pisto

Details Electrohydraulic and hydromechanical valve system for dual-pisto Electrohydraulic and hydromechanical valve system for dual-pisto

1990-02-20

1991-09-10

Look, Edward K.

Motors: expansible chamber type

Extension of unit having separately controlled working...

Vane

60443, 92 51, F16H 3946, F15B 1118

Patent

active

050463977

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: 2831464 (1958-04-01), Lillquist
patent: 2893209 (1959-07-01), Colley
patent: 3556154 (1971-01-01), Kramer
patent: 4726281 (1988-02-01), DeFilippi

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