Force feel actuator fault detection with directional threshold

Details Force feel actuator fault detection with directional threshold Force feel actuator fault detection with directional threshold

1979-07-23

1981-10-13

Maslousky, Paul E.

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91361, 91363A, 91390, 91437, 244223, F15B 1314, F15B 1316

Patent

active

042941628

ABSTRACT:
In a system which provides feel-force to the control stick of an aircraft by means of hydraulic pressure, a fault indicating system which responds to excessive differences between desired and actual force in the actuator, only of a polarity in the same direction as concurrent stick motion, to separate pilot induced pressure excesses from force-system faults, is provided with directional sensitivity in the fault-indicating output logic. Excessive pressure errors in either direction of stick travel institute the monitoring of changes in stick position. Changes in stick position of an excessive magnitude are recognized as fault only if they occur in the same direction as the direction of excessive pressure error. A simple analog embodiment utilizes threshold detectors and a track store device; a dedicated-digital embodiment utilizes comparators, registers and a subtractor; and a computer embodiment utilizes a software routine.

REFERENCES:
patent: 2530659 (1950-11-01), Hill
patent: 2940699 (1960-06-01), Plummer
patent: 3463423 (1969-08-01), Wong et al.
patent: 3568572 (1971-03-01), Steinmetz

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