Fault Estimation Observer Design for Descriptor Switched Systems With Actuator and Sensor Failures

This paper is concerned with the fault estimation (FE) problem for continuous-time descriptor switched systems with unknown external disturbances, actuator, and sensor faults. In this paper, the multiplicative actuator fault is decoupled into the normal term and the fault term, where the actuator fault term and sensor faults can be extended into a new augmented vector. Then, a novel FE approach is developed for descriptor switched systems subject to the switching actions and state-inconsistence phenomena. By the parameter design, the proposed method can eliminate the effect of faults and disturbances, and achieve the accurate estimations of states and faults simultaneously. Finally, an example of circuit system is presented to show the effectiveness of the proposed method.