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| Torque coordination control during the braking mode transition of an electric vehicle |
| YANG Yang1,2, HE Yundong2, LUO Chang2, YANG Zhong3 |
1.State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China;
2.School of Automotive Engineering, Chongqing University, Chongqing 400044, China；
3.Chongqing Changan Automobile Co., Ltd., Chongqing 400023, China |
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Abstract Differences in dynamic response characteristics of an electro-hydraulic braking system cause the jerk of the vehicle and its components during brake mode transition, which affects the ride comfort of the vehicle and the service life of components.In order to reduce the jerk of vehicle and the total braking torque fluctuation, the wheel cylinder pressure was accurately controlled by a combined control algorithm containing a proportional-integral-derivate (PID) and fuzzy controller.Then the dynamic model of the hydraulic braking system was selected as the reference model.Differences between the response characteristics of the electric motor braking system and the hydraulic braking system can be reduced by controlling the electric motor braking torque′s variation according to the torque output calculated by the reference model.The vehicle model and electro-hydraulic brake model were built using MALAB/Simulink, and the effectiveness of the proposed control strategy was verified.Compared with the mode transition without coordination, the results show that the total braking torque fluctuation and the vehicle jerk are significantly reduced by using the mode transition with coordination, which improves the ride comfort of the vehicle.
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Received: 30 December 2019
Published: 28 May 2021
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