A study on fault diagnosis and fault tolerant control of vehicle electromagnetic hybrid active suspension

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (4) : 101-109.

KOU Farong, WU Jianghao, XU Jia’nan, CHEN Ruochen

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Abstract

Aiming at the failure of an actuator of the electromagnetic hybrid suspension of the vehicle, a fault diagnosis and fault-tolerant control method is proposed. The 7-degree-of-freedom model and the failure suspension model of the vehicle are established, and the LQG controller is used as the conventional controller of the electromagnetic hybrid active suspension, and the unknown input observer is used to obtain the state observation value of the suspension. Based on the obtained suspension working space residual, a logic module and a stability module are designed to diagnose the suspension fault. The simulation analyzes the dynamic characteristics of the suspension in the time domain and frequency domain under the fault-tolerant control strategy. The results show that: in the time domain and frequency domain, suspension working space, body vertical acceleration, pitch angular acceleration, roll angular acceleration are all improved, and the ride comfort and safety of the vehicle are improved. Finally, the real vehicle test of fault-tolerant control of electromagnetic hybrid suspension is carried out. The test results show that the left-front suspension working space is reduced by 43.736% and the body vertical acceleration is reduced by 40.325% under the fault-tolerant control, which verifies the effectiveness of the fault-tolerant control method.

Key words

active suspension / Unknown Input Observer / fault tolerant control / fault diagnosis；residual

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KOU Farong, WU Jianghao, XU Jia’nan, CHEN Ruochen. A study on fault diagnosis and fault tolerant control of vehicle electromagnetic hybrid active suspension[J]. Journal of Vibration and Shock, 2022, 41(4): 101-109

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