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1 International Journal of Applied Mathematics and Computer Science

1 2011

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Observer-based fault-tolerant control against sensor failures for fuzzy systems with time delays

Tong S., Yang G., Zhang W.

International Journal of Applied Mathematics and Computer Science

2011

Vol. 21, no 4

617-627

This paper addresses the problems of robust fault estimation and fault-tolerant control for Takagi-Sugeno (T-S) fuzzy systems with time delays and unknown sensor faults. A fuzzy augmented state and fault observer is designed to achieve the system state and sensor fault estimates simultaneously. Furthermore, based on the information of on-line fault estimates, an observer-based dynamic output feedback fault-tolerant controller is developed to compensate for the effect of faults by stabilizing the resulting closed-loop system. Sufficient conditions for the existence of both a state observer and a fault-tolerant controller are given in terms of linear matrix inequalities. A simulation example is given to illustrate the effectiveness of the proposed approach.