Driving moment distribution method and system for four-wheel-drive electric vehicle and electric vehicle

Abstract

The invention provides a driving moment distribution method and system for a four-wheel-drive electric vehicle and an electric vehicle. The driving moment distribution method comprises the following steps that in the running process of the electric vehicle, electric vehicle total demand driving moment corresponding to the target vehicle speed under the liner driving working condition of the electric vehicle, adjusting yawing moment of the electric vehicle under the steering driving working condition of the electric vehicle and additional adjustment driving moment of all wheels under the wheel driving trackslip working condition of the low adhesion road surface are obtained correspondingly; vertical loads of all wheels and total vertical load of the electric vehicle are obtained correspondingly; and driving moment distribution is conducted on all wheels in the preset moment distribution mode according to the total demand driving moment, the adjusting yawing moment, the additional adjustment driving moment of all wheels, the vertical loads of all wheels and the total vertical load of the electric vehicle. According to the driving moment distribution method, rational driving moment distribution can be conducted on all wheels in real time according to dynamic running situation of the electric vehicle and different loads of the wheels, the energy utilization efficiency is improved, slipping of driving wheels can be effectively prevented, and running safety of the electric vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a driving torque distribution method and system of a four-wheel drive electric vehicle and the electric vehicle. Background technique [0002] At present, the driving torque distribution method of electric vehicles has a big defect, that is, the driving torque distributed to each wheel during steering is unreasonable. Most of the torque distributed to each wheel is either equally divided by four wheels, or the front and rear wheels A certain proportion, but the left and right wheels are equal, and the torque cannot be reasonably distributed in real time according to the dynamic driving situation of the vehicle and the different loads of the wheels. As a result, the driving torque cannot reasonably exert its effect during the acceleration drive or turning drive process of the vehicle, which eventually leads to low energy utilization efficiency. , the driving wheel slips, and e...

AI Technical Summary

Problems solved by technology

[0002] At present, the driving torque distribution method of electric vehicles has a big defect, that is, the driving torque distributed to each wheel during steering is unreasonable. Most of the torque distributed to each wheel is either equally divided by four wheels, or the front and rear wheels A certain proportion, but the left and right wheels are equal, and the torque cannot be reasonably distributed in real time according to the dynamic driving situation of the vehicle and the different loads of the wheels, resulting in that the driving torque cannot reasonably exert its effect during the acceleration drive or turning drive process of the vehicle, which eventually leads to low energy utilization efficiency , the driving wheel slips, and even causes the vehicle to fail to drive according to the driver's intention, affecting the safe driving of the vehicle

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