Research For The Method Of Fault Detection And Diagnosis Of Control System

Due to modem control systems are tended to be huger and more complex, the demand for high reliability and safety in modem industry increase rapidly. Fault diagnosis technology provides security for the reliability and safety of complex system. Hence, research on fault diagnosis is of important theoretic sense and wide applications.In Chapter 1 we introduce the research background and the latest development of fault detection and diagnosis technology. We introduce some existing fault detection and diagnosis methods, and discuss the basic idea and features of these methods; in Chapter 2 we introduce the relevant basic knowledge of linear matrix inequality, the Lyapunov stability and the controller design; Chapter 3 and Chapter 4 are the main research work of this paper and also are where the innovation lies, they can be summarized as follows:Firstly, to a kind of simple linear time-invariant system, a new fault diagnosis method based on sensors and actuators are proposed in the thesis. By using the relevant knowledge of linear system theory and matrix theory, the system possible fault cases are made detailed analysis; compare the actual output value with the theory output value of system, we determine to the system fault causes. And the approaches discussed in this chapter are demonstrated to be affective through numerical examples.Secondly, a new fault detection and diagnosis method based on observer are proposed in the thesis. We introduce fault model of sensors, actuators and state; to linear time-invariant system with accurate mathematical model, fault detection observer of single output system and multiple output system are proposed respectively. A new fault diagnosis method based on observer is proposed. Finally, the methods discussed in this chapter are demonstrated to be affective through numerical examples.Finally, the tasks in the paper are summarized, and next research direction of fault diagnosis is pointed out.