Detection method of oscillatory failure in position servo control subsystem of aircraft, involves calculating count of successive and alternating overshoots of threshold value using residual value

摘要

The difference between theoretical position estimated according to reference position of control surface and actual position measured by a sensor is computed, so as to calculate a residual value. The residual value is compared to a predetermined threshold value. A count of the successive and alternating overshoots of the threshold value is calculated using the residual value. The oscillatory failure representing a sinusoidal periodic signal, frequency, amplitude and phase following a uniform law, is detected when the count is greater than a predetermined number. Independent claims are included for the following: (1) detection device of oscillatory failure in position servo control subsystem; and (2) electrical flight control system.