SENSOR FAULT DETECTION, ISOLATION AND ACCOMODATION

摘要

A sensor in an engineering system (10) can be tested to detect, isolate and accommodate faults. Initially, a modeled sensor value (M ) of each actual sensor value (S) is generated as a function of a plurality of other sensors. An absolute value of a difference between the actual sensor value (S) and the modeled sensor value (M) is then computed (14) and compared (16) to a predetermined threshold (T). A sensor fault is detected i f the difference is greater than the predetermined threshold (T). Once a senso r fault is detected, it is isolated using hypothesis testing (22) and maximum wins strategies (26). After the fault is isolated (20), the fault is accommodated (22) by substituting the modeled sensor value (M) for the actual sensor valu e (S).