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| Fault diagnosis of 48 V micro hybrid system based on structural analysis |
| 1. Huibei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, Hubei 430070,China; 2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan, Hubei 430070, China; 3. Technology Center of Dongfeng Trucks, Wuhan, Hubei 430070, China |
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Abstract The working principle of 48 V micro hybrid system and the structural analysis were introduced. The simulation model of 48 V micro hybrid system was established in Matlab/Simulink software to analyze the common failure modes of the sensors and synchronous belt transmission. Five minimal structurally overdetermined sets（MSO sets） corresponding to fault model of 48 V micro hybrid system were selected based on structural analysis (SA) to design the fault detection and isolation (FDI) system with fault eigenvectors of system defined by the diagnostic strategy. The simulation results show that compared with traditional methods, the diagnostic method based on structural analysis uses less residuals and can simply algorithm. The FDI system can use only five residuals to detect and isolate 10 kinds of system faults in 48 V micro-hybrid system, and all of them can be completely isolated from each other.
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Received: 12 November 2018
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2019, Vol. 40 
