Method and device for electrohydraulic control of a hydraulic ac

Details Method and device for electrohydraulic control of a hydraulic ac Method and device for electrohydraulic control of a hydraulic ac

1974-07-19

1976-10-26

Cohen, Irwin C.

Motors: expansible chamber type

With signal, indicator or inspection means

91 3, 91459, 91461, 91471, F01B 2526, F15B 13042

Patent

active

039877027

ABSTRACT:
Method and apparatus for the electric hydraulic control of a hydraulic actuator, said control comprising a redundant servovalve circuit with switching and monitoring logic. The apparatus has a plurality of electrohydraulic servovalves each controlled by separate electrical input channels and connected to a central pressure medium source. The control further has a control spool triggered by the servovalve to control the actuator and a hydraulic logic system for monitoring errors in the servo output signal. The positioning land of the control spool is acted upon on the one side by one group of signals consisting of the combined output signals of the same sign from one selected group of servovalves and is acted upon on the other side by the central pressure medium supply while the remaining sevovalve signals are applied separately to a hydraulic logic system including a comparator and alarm means.

REFERENCES:
patent: 3237634 (1966-03-01), Colby, Jr.
patent: 3265089 (1966-08-01), Nill
patent: 3391611 (1968-07-01), Jenney
patent: 3496836 (1970-04-01), Jenney
patent: 3556154 (1971-01-01), Kramer
patent: 3667344 (1972-06-01), Westbury et al.
patent: 3739689 (1973-06-01), Craven

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