Control method and system for battery electric vehicle shaking

Abstract

The invention provides an inhibiting method and system for battery electric vehicle shaking. According to the method, the current needed torque of a driving motor is obtained firstly; then whether the needed torque needs compensation or not is judged; if the needed torque needs to be compensated, a torque compensation step is conducted; if not, the driving motor is controlled to operate according to the needed torque; and the torque compensation step comprises the content that the compensation torque is obtained through a preset algorithm according to the current motor rotating speed of the driving motor, the compensation torque is used to compensate the needed torque, the output torque is obtained, and the driving motor is controlled to operate according to the output torque. The output torque of the driving motor is obtained through compensation of the compensation torque obtained according to the current motor rotating speed, so that fluctuation of the rotating speed of the driving motor can be eliminated, shaking of the electric vehicle is inhibited, and comfort of a driver in driving is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vibration control method and system for pure electric vehicles. Background technique [0002] At present, with the continuous development of pure electric vehicle technology, pure electric vehicles have been able to gradually replace traditional fuel vehicles and become the means of transportation for people's daily travel. [0003] Whether it is a traditional fuel vehicle or a pure electric vehicle, the power system is one of the most critical components. The power system of a traditional fuel vehicle is composed of an engine, clutch, flywheel and gearbox, while the power system of a pure electric vehicle is composed of a drive motor and a reducer. [0004] When a pure electric vehicle is running, operations such as slamming on the accelerator or emergency braking will cause a large change in the torque demand of the drive motor, resulting in large fluctuations in t...

AI Technical Summary

Problems solved by technology

The drive motor and the reducer are connected by splines, and the connecting parts such as the clutch and flywheel in the fuel vehicle are removed in the middle. Therefore, the shock absorption effect will be much worse than that of the traditional fuel vehicle, and the torsional vibration of the power system will cause the overall The car shakes, which has a great impact on the driving comfort of customers

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