Torque Coordination Control of an Electro-Hydraulic Composite Brake System During Mode Switching Based on Braking Intention

Yang Yang, Yundong He, Zhong Yang, Chunyun Fu and Zhipeng Cong
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Yang Yang: State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
Yundong He: School of Automotive Engineering, Chongqing University, Chongqing 400044, China
Zhong Yang: Chongqing Changan Automobile Co., Ltd., Chongqing 400023, China
Chunyun Fu: State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
Zhipeng Cong: School of Automotive Engineering, Chongqing University, Chongqing 400044, China

Energies, 2020, vol. 13, issue 8, 1-19

Abstract: The electro-hydraulic composite braking system of a pure electric vehicle can select different braking modes according to braking conditions. However, the differences in dynamic response characteristics between the motor braking system (MBS) and hydraulic braking system (HBS) cause total braking torque to fluctuate significantly during mode switching, resulting in jerking of the vehicle and affecting ride comfort. In this paper, torque coordination control during mode switching is studied for a four-wheel-drive pure electric vehicle with a dual motor. After the dynamic analysis of braking, a braking force distribution control strategy is developed based on the I-curve, and the boundary conditions of mode switching are determined. A novel combined pressure control algorithm, which contains a PID (proportional-integral-derivative) and fuzzy controller, is used to control the brake pressure of each wheel cylinder, to realize precise control of the hydraulic brake torque. Then, a novel torque coordination control strategy is proposed based on brake pedal stroke and its change rate, to modify the target hydraulic braking torque and reflect the driver’s braking intention. Meanwhile, motor braking torque is used to compensate for the insufficient braking torque caused by HBS, so as to realize a smooth transition between the braking modes. Simulation results show that the proposed coordination control strategy can effectively reduce torque fluctuation and vehicle jerk during mode switching.

Keywords: electric vehicles; electro-hydraulic braking; braking intention; mode switching; torque coordinated control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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