FAULT-TOLERANT CONTROL WITH SWITCHING STRATEGY

A dual redundant control system whose fault-tolerant policy is capable of removing the failed controller is proposed. The heuristics of dete cting failures of a controller and changing the time weight take the f orm of a set of linguistic decision rules in fuzzy logic. This detecti on method based on performance measure enables the detection of a fail ed controller without relying on mathematical model and failure assump tions. It can handle gradually degrading failures as well as catastrop hic failures by introducing the concept of failure measure and time we ight. The failed controller is smoothly removed by reducing the time w eight of the failed controller.