Aircraft engine component and sensor fault detection and isolation approach was proposed

which included fault type detection module and component-sensor simultaneous fault isolation module. The approach can not only distinguish among sensor fault

component fault and component-sensor simultaneous fault

but also isolate and locate sensor fault and the type of engine component fault when the engine component fault and the sensor faults occur simultaneously. The double-threshold mechanism has been proposed

in which the fault diagnostic threshold changed with the sensor type and the engine condition

and it greatly improved the accuracy and robustness of sensor fault diagnosis system. Simulation results show that the approach proposed can diagnose and isolate the sensor and engine component fault with improved accuracy. It effectively improves the fault diagnosis ability of aircraft engine.