Patent ID: 9032786
Filing Date: 2015-05-19
Classification: F02C,F05D

Abstract:
1. Method for monitoring a control device of a fuel metering valve of an aircraft turbojet engine, the control device supplying a control current to a servo valve in order to modify a position of the fuel metering valve, the method comprising: determining the position of the fuel metering valve during a flight of the aircraft; determining the travelling speed of the fuel metering valve based on said position of the fuel metering valve; determining the control current when the travelling speed of the fuel metering valve is zero due to an absence in variation of said position of the fuel metering value; calculating a mean control current when the travelling speed of the fuel metering valve is zero, the mean control current forming an indicator of deterioration in function of the control device; comparing the deterioration indicator with a reference base of indicators of deterioration so as to infer a type of deterioration in function of the control device; calculating an abnormality score for the deterioration indicator; comparing the abnormality score with a decision threshold of abnormality that is characteristic of the type of deterioration; and releasing an alarm in case of violation of the decision threshold of abnormality.