Fault diagnosis and fault‐tolerant control for a class of singular intermittent sampling time‐delay systems under sensor and actuator failures

Abstract In this paper, an observer‐based fault estimation and fault‐tolerant control scheme for intermittently sampled singular systems subject to simultaneous actuator and sensor failures, time‐varying interval delays, and external disturbances is investigated. A new observer, the extended sampled‐data proportional–integral observer (SPIO), is designed. Compared with the conventional PIO, better estimation performance can be obtained by using the designed observer. In addition, the impulsive nature of the closed‐loop system can be eliminated by adding state estimation derivatives, which improves the design scheme of the FTC for singular system. All feasible conditions are given in the linear matrix inequality (LMI) framework. Finally, the superiority and practicality of the scheme are verified through simulation and comparison with existing literatures.