Abstract: The failure detection of dynamical systems is dealt with. There are a lot of approaches for failure detection of dynamical systems, but most of them assume that the model of the system is an exact model without any error It has been proved in prac-tice that this assumption is unrealistic. So a robust failure detection filter is proposed to solve the failure detection of dynamical systems with model error. The basic idea :is that the control make the model error unimportant if there is no failure, and the failure detection filter: gives the failure information if there is a failure. The computer simulation results have proved that the new approach in this paper is effective for robust failure detection of dynamical systems.

Key words: uncertain systems, failure detection, robust control