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Automotive Engineering ›› 2019, Vol. 41 ›› Issue (7): 831-838.doi: 10.19562/j.chinasae.qcgc.2019.07.015

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Parity Space Approach for Fault Diagnosis of Lithium-ion Battery Sensor for Electric Vehicles

Pan Fengwen, Ma Bin, Gao Ying, Xu Mingwei ,Gong Dongliang   

  1. Jilin University, State Key Laboratory of Automotive Simulation and Control, Changchun 130025
  • Online:2019-07-25 Published:2019-07-30

Abstract: Based on the first-order equivalent circuit model of the battery, this paper couples the heat generation and heat transfer equations of the battery, and establishes an electro-thermal model that reflects the dynamic response and thermal characteristics of the battery. Based on this, the parity space method is used to detect the fault of the battery output sensor and a fault isolation method based on system matrix operation is proposed. With the random current excitation as the input signal, the battery output sensor fault is analyzed. The results show that the residual generator designed by the parity space approach can accurately detect the battery output sensor fault, and its response to the fault signal is much larger than the oscillation caused by modeling accuracy. The improved residual generator can accurately isolate the fault source based on the detection of the output sensor fault

Key words: lithium-ion battery, electro-thermal model, parity space approach, fault detection and isolation