Research on Electronic Differential Control Method of Electric Vehicle Based on Relatively Slip Rate

doi:10.3901/JME.2017.16.112

Abstract

Abstract: This paper put forward electronic differential control method of electric vehicle based on relatively slip rate and designs linear quadratic type of optimal sliding mode controller based on optimal control and sliding-mode control, which aims at in-wheel motor drive electric vehicle existing problem that relative slip rate of driving wheel is maximum interfered by the external world in the curve. Adopting front wheel steering rear-wheel drive of in-wheel motor drive electric vehicle as a subject for study, which aims at handing stability characteristics of electronic differential control of electric vehicle and structuring including three degree-of-freedom complete vehicle stimulation model of electric vehicle longitudinal motion, lateral motion and transverse motion.Through linear model, the driving relative slip ratio of the electric vehicle is taken as the feedback control quantity. It consequently controls relative slip rate of driving wheel through controlling torque coordinating percentage of car to control drive wheel's output torque. The simulation results show that the controlling method realizes the vehicle's minimum relative slip rate of driving wheel in the course of turning and enhances immunity from interference of electronic differential system. It effectively enhances the robust stability of system and improves roadability of vehicle.

Key words: electronic differential, linear quadratic regulator (LQR) sliding mode control, relative slip rate, robust stability

CLC Number:

TP273
U469

ZANG Huaiquan, DAI Yan, ZHANG Suyan, DI Congna. Research on Electronic Differential Control Method of Electric Vehicle Based on Relatively Slip Rate[J]. Journal of Mechanical Engineering, 2017, 53(16): 112-119.

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