Sensor fault detection, isolation and accomodation

Details Sensor fault detection, isolation and accomodation Sensor fault detection, isolation and accomodation

G - Physics

01

D

G01D 21/00 (2006.01) G01D 3/08 (2006.01) G06F 17/00 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2354944

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 if the difference is greater than the predetermined threshold (T). Once a sensor 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 value (S).

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