Research on fault diagnosis of circuit of vehicle system

Fault diagnosis of a circuit of vehicle system is analyzed in this paper. Complex field fault modeling is used for fault diagnosis of the conditioning circuit of vehicle system. And all single faults of components in the circuit are modeled in complex field. Soft fault and hard fault of single components are analyzed in detail. The problem of coincidence of fault characteristic equations is solved by changing the topological structure of circuit. And the problem of intersection is analyzed by increasing the frequency of excitation source. Fault detection process and fault dictionary are given. Then the fault detection process is tested by six assumed faults. No matter soft fault and hard fault of single components, the fault detection in this paper can locate source of fault accurately.