Patent ID: 8818573
Filing Date: 2014-08-26
Classification: B64D

Abstract:
1. A detection method for an uncontrolled movement of a control surface which is servo-controlled in position by a feedback loop belonging to an electrical flying command system of the aircraft and comprising: the control surface being mobile and the position of which with respect to the aircraft is adjusted by at least one actuator; the actuator that adjusts the position of the control surface as a function of at least one actuating order received as a feedback command; at least one sensor measuring the effective position of the control surface; and at least one calculator developing a control surface command order, that receives the measured effective position and deducts from it an actuating order that is transmitted to the actuator as a feedback command, a method where on an automatic and repetitive way, the following sequence of successive steps is followed: (a) a theoretical feedback current being representative of the feedback command emitted bay the calculator is determined; (b) a parameter being representative of the feedback command is measured with the help of at least one auxiliary sensor at the level of the mechanization of such command into the actuator and an effective feedback current is determined from the measured parameter; (c) the difference between the theoretical feedback current determined at step (a) and the effective feedback current determined at step (b) is calculated so as to form an error signal; and (d) an uncontrolled movement of the control surface is detected if a comparison value depending on the error signal is higher than a threshold value during at least one confirmation time.