METHOD AND DEVICE FOR DETECTING OSCILLATORY FAILURES IN AN AUTOMATIC POSITION CONTROL CHAIN OF AN AIRCRAFT CONTROL SURFACE

摘要

A detection device comprising a first data processing unit configured to determine a first trend of the control surface control order as a function of time, the first trend being defined according to a reference parameter, a second data processing unit configured to determine at least one second trend of the control surface position value as a function of time, the second trend being also defined according to the reference parameter, and a monitoring unit configured to compare the first and second trends in order to verify the existence of a correlation between these first and second trends so as to detect an oscillatory failure as soon as a loss of correlation between the first and second trends appears, if necessary.

主权项

1. A method for detecting at least one oscillatory failure in at least one automatic position control chain of at least one control surface of an aircraft, the automatic control chain forming part of a system of electrical flight controls of the aircraft and comprising:
the control surface which is mobile, and the position of which relative to the aircraft is set by at least one actuator; the actuator which sets the position of the control surface, according to at least one actuation order received; at least one sensor which measures a position value representative of the actual position of the control surface; and a computer which generates a control order using a computation element, which receives the measured position value and which deduces therefrom an actuation order which is transmitted to the actuator, wherein the method comprises the following series of successive steps, implemented automatically and iteratively:
a) a first data processing step comprising determining a first trend of the control order as a function of time, the control order being supplied by the computation element, the first trend being defined according to a reference parameter;b) a second data processing step comprising determining at least one second trend of the position value as a function of time, the second trend being also defined according to the reference parameter; andc) a monitoring step comprising comparing the first and second trends to verify the existence of a correlation between these first and second trends so as to detect an oscillatory failure as soon as a loss of correlation between the first and second trends appears if necessary.