Torque coordination control of electrohydraulic brakesystem during mode transition(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年6期
- Page:
- 107-117
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Torque coordination control of electrohydraulic brakesystem during mode transition
- Author(s):
- YANG Yang1; 2; HE Yundong2; WANG Chao2; YANG Zhong3; LIAO Shuiping3
- (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)
- Keywords:
- automobile engineering; electrohydraulic composite brake; torque coordination control; HEV; mode transition; ride comfort
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to reduce the torque fluctuation and vehicle jerk during mode transition caused by differences in dynamic response of motor and hydraulic brake system, the coordination control strategy was studied based on a fourwheeldrive hybrid electric vehicle (HEV). Firstly, the dynamic characteristics in every mode were analyzed, and the braking force distribution control strategy was developed based on vehicle state parameters, and thus the boundary of different brake modes was determined. Then, the fuzzy logic control rules of the target change rate of hydraulic brake force were formulated based on brake pedal opening and its change rate. The target brake torque of motor brake system was restricted by the actual torque output and by the hydraulic brake system, and thus the differences in hydraulic brake system and motor brake system could be reduced, to realize a smooth transition of brake mode. Finally, the electrohydraulic brake model and vehicle forward simulation model were built in MATLAB/Simulink, and a cycle condition contained typical mode transition was designed, to verify the dynamic coordinated of the proposed control strategy. The results show that the proposed control strategy can significantly reduce vehicle jerk and torque fluctuation during mode transition, and the ride comfort is improved based on reflecting the brake intention of driver. When hybrid brake switch to pure hydraulic brake mode, the jerk of complete vehicle is reduced from 36.42 to 17.33 m/s3, and when pure electric brake switch to pure hydraulic brake mode, the vehicle jerk is reduced from 77.60 to 4.06 m/s3. 2 tabs, 15 figs, 24 refs.
Last Update: 2020-12-17