Pure electric vehicle with three-motor transmission structure and its torque distribution optimization algorithm

Abstract

The invention relates to the field of new-energy automobiles and particularly discloses a three-motor transmission structure battery electric vehicle. The vehicle comprises a front axle drive motor and two rear wheel drive motors in the same model. The two rear wheel drive motors are the left rear wheel drive motor and the right rear wheel drive motor. The front axle drive motor is connected witha front axle of the electric vehicle, the left rear wheel drive motor is installed on a hub of a left rear wheel of the electric vehicle, and the right rear wheel drive motor is installed on a hub ofa right rear wheel of the electric vehicle. The size, the peak torque and the power of the two rear wheel drive motors are all smaller than those of the front axle drive motor. The output end of the front axle drive motor is connected with a clutch, the three drive motors provide torque for the electric vehicle, when the clutch is disengaged, the torque is evenly distributed to the two rear wheeldrive motors, the clutch is engaged when the required torque reaches a preset value, and the torque is distributed to the three drive motors according to a preset distribution algorithm. The inventionfurther discloses a torque distribution optimization algorithm of the three-motor transmission structure battery electric vehicle.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a pure electric vehicle with a three-motor transmission structure and a torque distribution optimization algorithm thereof. Background technique [0002] Pure electric vehicles have gradually become the object of vigorous development worldwide. Pure electric vehicles not only have the advantages of zero emission and no pollution, but also have low noise, weak vibration and good driving comfort during driving. [0003] The parameter matching of pure electric vehicles is an important part of designing the drive train structure of pure electric vehicles. Most of the existing pure electric vehicles adopt a drive train structure with one motor or two motors arranged in front and rear respectively, such as Tesla's Model S, domestic Weilai, Xiaopeng Motors, etc. For electric vehicles with a single-motor arrangement, its structure is simple and does not require complex control algorit...

AI Technical Summary

Problems solved by technology

For electric vehicles with a single-motor arrangement, its structure is simple and does not require complex control algorithms, so the cost is low, but the motor’s working efficiency is low, and the low-efficiency area of ​​the motor cannot be avoided during operation. For complex working conditions, the peak torque cannot Satisfies the hidden danger of insufficient power, and even when the braking energy is recovered, the energy recovery process cannot effectively use the braking energy, and it will affect the cruising range

The arrangement of dual motors can effectively solve the problems of insufficient power and difficult recovery of braking energy in the single motor structure. Generally, two motors of the same size are arranged on the front and rear axles in the dual motor structure. This configuration is due to the two Larger motor costs more, resulting in increased vehicle cost

[0004] For a pure electric vehicle configuration with multiple motors, how to distribute the required torque to each motor is an inevitable problem. For dual motors, some scholars distribute the required torque to the two motors equally. It has a good effect on high torque demand, and can avoid the motor working in the low efficiency area at high load, but at low torque demand, the working efficiency of the two motors will decrease. Some scholars add a motor after one motor Clutch, working with one electric motor in the low torque area to improve working efficiency

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