An Optimal Torque Distribution Control Strategy for Four-Wheel Independent Drive Electric Vehicles Considering Energy Economy

Jianjun Hu,Junlong Tao,Feng Xiao,Xiyuan Niu,Chunyun Fu

doi:10.1109/access.2019.2944479

Jianjun Hu, Junlong Tao + Show 3 more

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https://doi.org/10.1109/access.2019.2944479

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Abstract

To further improve the energy economy of a four-wheel independent drive electric vehicle (FWIDEV) in the process of vehicle stability control, in this paper, the influence of different wheel torque distributions on vehicle stability and energy economy during vehicle steering is analyzed in depth. Then the wheel torque distribution scheme when the vehicle steering is established. Combined with the economic-based torque distribution strategy applied in the straight running condition, an optimal wheel torque distribution strategy is proposed for FWIDEV to adapt different driving conditions. And the controller designed in this paper adopts hierarchical control structure. The upper controller calculate the corrective yaw moment based on the sliding mode control. The lower controller implements wheel torque distribution according to the proposed strategy. Finally, the simulation results under different driving scenarios indicate that the proposed control strategy can achieve the same effect as the conventional control strategy in terms of vehicle stability, but the energy economy is improved by about 2.4%.

Highlights

Electric vehicles are considered to be an effective way to solve problems such as environmental pollution and energy shortage due to their higher efficiency, low noise and nearly zero emissions [1], [2]
In order to keep the vehicle stable and safety under emergency situations, a variety of chassis control systems have been developed such as four-wheel steering (4WS), active front steering (AFS), direct yaw-moment control (DYC) and so on. 4WS adjusts the steering angle of the rear wheel according to the error between the actual yaw rate of the vehicle and the reference value to change the lateral force on
According to the above research, in order to improve the economy while ensuring the stability of the vehicle, the optimal torque distribution control strategy for the vehicle under

Summary

Introduction

Electric vehicles are considered to be an effective way to solve problems such as environmental pollution and energy shortage due to their higher efficiency, low noise and nearly zero emissions [1], [2]. When the lateral acceleration of the vehicle is relatively small, the lateral force has a linear relationship with the wheel side angle. At this time, both 4WS and AFS have relatively ideal control effects. The literature [13], taking the tire slip rate as the design variable, determines the required yaw moment by controlling the tire slip rate to its ideal value, thereby adjusting the longitudinal force of each wheel to achieve DYC. Tian et al [15] designed the

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Results

Conclusion