Redundant servo with fail-safe electric system

Details Redundant servo with fail-safe electric system Redundant servo with fail-safe electric system

1979-03-02

1981-01-13

McCarthy, Edward J.

Motors: expansible chamber type

With motive fluid valve

Electrically operated

91363A, F15B 1304

Patent

active

042442770

ABSTRACT:
An electrical system for circumventing failed servo valves or interconnecting wiring in an aircraft actuator control system having tandem-connected, redundant, electro-hydraulic servo valves. Triacs, in the simplest embodiment of the invention, are in bridge connection with the operating coils of the servo valves, and are utilized to sense the failed condition and to substitute a shunt impedance element at the open circuit in order to maintain the integrity of the remainder of the system. Alternate embodiments of the invention disclose in conjunction with the triacs, sensitive relays to achieve latched-circuit characteristics and optical isolation devices to further reliability of the system by isolating portions of the circuit from the power supply.

REFERENCES:
patent: 3263572 (1966-08-01), Sunderland
patent: 3391611 (1968-07-01), Jenney
patent: 4054154 (1977-10-01), Mason
patent: 4138088 (1979-02-01), Cyrot
patent: 4143583 (1979-03-01), Bauer

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