Actuator Fault Estimation Based on Proportional–Integral Observer for Delayed Continuous-Time Switched Systems

This paper deals with the problem of actuator fault estimation for continuous-time switched systems with state delay. The proposed fault estimation approach uses a switching proportional–integral observer which allows to obtain fast and exact fault information. Sufficient conditions are achieved by using a multiple Lyapunov–Krasovskii functional. These conditions are manipulated in a simple way in order to obtain a new linear matrix inequality different from the existing ones. To prove the effectiveness of the proposed results, an example of a switched electrical circuit is performed.

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