吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (2): 380-386.doi: 10.13229/j.cnki.jdxbgxb20170062

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Regenerative braking control strategy of plug-in hybrid electric vehicle based on speed ratio control continuously variable transmission

QIN Da-tong, LIN Yu-pei, HU Jian-jun, GUO Zi-han   

  1. College of Automotive Engineering, Chongqing University, Chongqing 400044,China
  • Received:2017-01-18 Online:2018-03-01 Published:2018-03-01

Abstract: To recover the braking energy as much as possible without affecting the driving intention, an ideal braking force distribution strategy based on threshold value is proposed. First, considering the comprehensive optimal efficiency of the motor, battery and Continuously Variable Transmission (CVT), the CVT ratio control strategy is developed. Then, the relationship between the inertia torque and intention of driving brake is obtained based on dynamic characteristic analysis of the transmission system during braking process. Third, with the goal to increase the regenerative braking power, the target of CVT speed ratio and braking force distribution is modified using discrete exhaustive optimization algorithm in combining with the comprehensive efficiency of the optimal CVT ratio control strategy. Finally, a CVT optimal control strategy is proposed based on speed ratio limitation and motor coordinated control. Simulation results show that under different braking conditions, the regenerative braking control strategy enables the vehicle to follow the driver's intention effectively during braking, and increases the recovery ratio of braking energy and improves the driving performance.

Key words: vehicle engineering, plug-in hybrid electric vehicle, continuously variable transmission speed ratio control, regenerative braking control strategy, braking intention

CLC Number: 

  • U461.3
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