Method and system for improving torsional vibration of electric vehicle half shaft and electric vehicle

Abstract

The embodiment of the present disclosure discloses a method, system and electric vehicle for improving half-axis torsional vibration of an electric vehicle. The method is to perform closed-loop compensation according to current half-axis torsional vibration data. The system includes a half-axis torsional vibration data measuring mechanism for obtaining current half-axis torsional vibration data; and a controller for calculating and obtaining a compensation amount according to the current half-axis torsional vibration data, and controlling the motor based on the compensation amount. The invention solves the vibration problem caused by the torsional vibration of the half shaft, and prolongs the service life of the device without affecting the acceleration performance of the whole vehicle.

Description

technical field [0001] The present disclosure relates to electric vehicle research technology, in particular to a method and system for improving half-axis torsional vibration of an electric vehicle and the electric vehicle. Background technique [0002] In recent years, with the development and growth of new energy vehicles, my country has been the largest country in the production and sales of new energy for three consecutive years, but relatively, the problems caused by new energy vehicles due to their new structure and new power have become more and more obvious. [0003] Today, almost all new energy passenger vehicles have canceled traditional devices such as transmissions and dampers, and directly achieve power output through motors and reducers with fixed reduction ratios. higher requirements. [0004] In the prior art, in order to solve this problem, physical means are usually used for adjustment, that is, the lengths of the left and right half shafts are adjusted t...

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Problems solved by technology

This solution requires a large cost, and even requires major changes to the car body structure, which wastes layout space and cannot completely improve the torsional vibration problem; there is another solution that is based on the driver's subjective feelings during driving or through The motor controller feeds back the speed fluctuation to adjust the compensation gain. However, this solution needs to be calibrated under specific working conditions, and cannot meet the torsional vibration caused by the half-axis system under different loads and different operating modes.

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