A torque optimization distribution control method for four-wheel drive electric vehicles

Abstract

The invention relates to a torque optimization distribution control method for a four-wheel drive electric vehicle, which formulates a motor efficiency calculation model for the motor under driving conditions, coasting conditions and starting conditions, and divides the vehicle driving mode into two-axis driving modes , single-axis driving mode, dual-axis starting mode and single-axis starting mode, respectively determine the power consumption calculation methods in different modes, and obtain the torque distribution coefficient with the goal of energy optimization through the offline global optimization algorithm. In order to avoid excessive torque changes in the control process, a torque optimization distribution model oriented to the torque change rate is established, and the dynamic weight factors are determined by fuzzy control rules, and finally the results of the four-wheel torque distribution are determined; this method reduces energy consumption and The current fluctuation in the motor is the target, and the torque distribution coefficient for energy saving and torque change rate and the corresponding global optimal efficiency are calculated, which greatly improves the cruising range of electric vehicles and ensures the safety and long-term use of in-wheel motors .

Description

technical field [0001] The invention relates to a torque optimization distribution control method for a four-wheel drive electric vehicle, belonging to the technical field of four-wheel drive of new energy vehicles. Background technique [0002] Pure electric vehicles have become the focus of common attention in the industry and are the core contributor to the growth of new energy vehicle ownership. Compared with traditional internal combustion engine vehicles and hybrid vehicles, pure electric vehicles have many advantages such as high efficiency, energy saving and environmental friendliness. Among them, the four-wheel independent drive electric vehicle driven by the hub motor has a more streamlined chassis structure, more considerable energy efficiency and more flexible control characteristics, which is the research hotspot of electric vehicle technology at the present stage, and has become the future smart car and One of the foundations for the development of intelligent ...

AI Technical Summary

Problems solved by technology

[0003] At present, the torque distribution in engineering applications is more inclined to the dynamic demand. If only the dynamic demand of the car is considered during driving, the working efficiency of the in-wheel motor is likely to be at a low level, which will lead to a decrease in the battery life of the electric vehicle. Withering, there is an urgent need for a scientific and reasonable torque distribution method to enable multi-hub motors to meet the dynamic performance of electric vehicles while maintaining the overall energy efficiency at a high level.

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