Patent Document ID: 20140236396
Application ID: 14186109
Patent Flag: 0

Claim One:
1. A method for detecting jamming and/or uncontrolled movement of an aircraft control surface controlled in position by a feedback loop forming part of an electrical flight control system of the aircraft and including: said control surface, which is movable and of which the position with respect to the aircraft is adjusted by at least one actuator; said actuator which adjusts the position of said control surface, as a function of at least one actuating command received in the form of a feedback command; at least one sensor which measures the effective position of said control surface; and at least one computer which produces a control command for the control surface, which receives said measured effective position and which deduces therefrom an actuating command which is transmitted to said actuator in the form of a feedback current, wherein the method comprises performing, in an automatic and repetitive manner: a) estimating the value of at least one parameter of an equation simulating the feedback loop dynamic of the control surface, according to a recursive autoregressive method with exogenous variable of RARX type in a recursive least squares way; and b) detecting jamming and/or uncontrolled movement of said control surface, according at least to the estimated parameter value by the application of a decision test in the parametric space.