Fault Diagnosis of Relay Control Circuit Based on Discrete Event System

A new method based on discrete event It is widely used in the field of language and system is proposed for fault diagnosis of a certain automata theory, supervisory control, Petri net theory, kind of circuit, such as a relay control circuit. The Markov chains and queuing theory, discrete-event original algorithm to obtain a minimal test set is simulation, and concurrent estimation techniques improved. By using the improved algorithm the finest (4,5). In 1990s, L. Feng et al. (6-12) firstly applied testable partition can be obtained and the complex the DES theory into fault diagnosis of circuit to solve testability analysis is avoided. The basic model of the the diagnosis problems of mixed-signal circuit. In a proposed method and the general rule for fault discrete event model, the failure status of a system diagnosis are described in detail. At first, the relay element is represented by a discrete state, the tests control circuit is described with corresponding and their results are described by events. combinational logic circuit model. Then, the fault Further, considering the special characteristics of diagnosis model of the circuit-under-test is the relay control circuit, an improved DES model is constructed based on the given DES model. This presented in this paper. And the original algorithm in method is applied to diagnose a relay control circuit. (10) is improved to obtain a minimal test set. Then, The results indicate that this method can diagnose the method is applied to diagnose a certain kind of this kind of circuit effectively and the new algorithm relay control circuit used in a remote-control system has a much lower computational complexity than the of main marine engine. original algorithm. The fault elements can be The rest of this paper is organized as follows. The localized exactly and this method has high practical general model of discrete event system is introduced value.