This paper deals with an analytical redundancy technology based on a component tracking filter (CTF)

which is integrated with failure detection

isolation and accommodation logic so as to improve the reliability of the engine digital control system.Its simulation tests in complete flight envelope show that the developed analytical redundancy technique enables the engine model on board to track the component performance variations correctly in the case of no sensor failure

and to detect

isolate and accommodate failures of sensors effectively without corruption when a failure occurs.