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Automotive Engineering ›› 2024, Vol. 46 ›› Issue (10): 1755-1765.doi: 10.19562/j.chinasae.qcgc.2024.10.004

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Dynamic Braking Allocation Strategy for Turning-Braking Maneuver

Tong Wu1,Jing Rong1,Junnian Wang2(),Wen Sun3,Liang Chu2,Linhe Ge1   

  1. 1.Hubei University of Automotive Technology,Hubei Key Laboratory of Automotive Power Train and Electronics,Shiyan  442002
    2.College of Automotive Engineering,Jilin University,Changchun  130022
    3.School of Automotive Engineering,Changzhou Institute of Technology,Changzhou  213032
  • Received:2024-07-23 Revised:2024-08-26 Online:2024-10-25 Published:2024-10-21
  • Contact: Junnian Wang E-mail:wjn@jlu.edu.cn

Abstract:

The vehicle dynamics during turning-braking maneuver are more complex than those on the straight lanes due to tire sideslip, load transfer and other factors. In depth investigation of the braking allocation strategy for enhancing the vehicle tracking performance in this maneuver is of great significance for driving safety. In this regard, a dynamic braking allocation strategy within electro-mechanical brake (EMB) is further investigated in this study. Firstly, the 2-DOF-vehicle dynamics model is taken as a reference, and the minimum lateral force requirements for stable driving of the front and rear axles are solved based on the model predictive control (MPC) algorithm. Then, the maximum longitudinal force available for braking each wheel is obtained by solving the friction circle online. Moreover, the braking allocation ratios are calculated according to the obtained maximum longitudinal force to realize the optimal braking allocation, The simulation and test results show that the proposed strategy enhances the vehicle tracking performance in turning-braking by dynamically adjust the braking force allocation ratios according to the driving conditions, load status and road adhesion conditions of the vehicle.

Key words: dynamic braking force allocation, turning braking, electro-mechanical brake, model predictive control, tracking performance