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

Abstract

The embodiment of the invention discloses a method and a system for improving torsional vibration of the half shaft of an electric vehicle and the electric vehicle. The method comprises the step thatclosed-loop compensation is conducted according to current half-axle torsional vibration data. The system comprises: a half-shaft torsional vibration data measuring mechanism used for obtaining current half-shaft torsional vibration data; and a controller which is used for calculating to obtain a compensation amount according to the current half-shaft torsional vibration data and controlling the motor based on the compensation amount. The problem of shaking caused by torsional vibration of the half shaft is solved, and the service life of the device is prolonged on the premise that the acceleration performance of the whole vehicle is not affected.

Description

technical field [0001] The present disclosure relates to electric vehicle research technology, in particular to a method, system and electric vehicle for improving the torsional vibration of an electric vehicle's half shaft. Background technique [0002] In recent years, with the development and growth of the power 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] Nowadays, almost all of the new energy passenger vehicles have canceled the traditional devices such as transmission and damping, and directly realize the power output through the motor and the reducer with a fixed reduction ratio. Therefore, NVH also raises the issue of jitter and deviation caused by the torsional vibration of the axle shaft. higher requirements. [0004] In the prior art...

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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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