Jitter control method and device for driving motor and vehicle

Abstract

The invention relates to a jitter control method and device for a driving motor and a vehicle. The method comprises the steps of obtaining a plurality of motor rotating speed differences of a drivingmotor at a plurality of moments according to the real-time rotating speeds of the driving motor at the plurality of moments in a preset duration after the vehicle is started and a target rotating speed obtained by carrying out compensation on a basic average rotating speed; determining whether the driving motor is in a jitter state or not according to the plurality of motor rotating speed differences, the rotating speed variance of the plurality of motor rotating speed differences and a waveform curve of the plurality of motor rotating speed differences; and when it is determined that the driving motor is in the jitter state, determining a target torque output by the driving motor at the current moment according to the steady-state torque and the compensation torque of the driving motor soas to control the jitter state of the driving motor. Real-time monitoring and torque compensation can be carried out on the jitter condition of the driving motor according to the difference value between the real-time rotating speed and the target rotating speed, and the accuracy of vehicle jitter control is improved on the basis that the manufacturing cost and energy consumption are not increased.

Description

technical field [0001] The present disclosure relates to the technical field of electric vehicles, in particular, to a vibration control method and device for driving a motor, and a vehicle. Background technique [0002] With the development of the world economy, the energy problem has become increasingly prominent, and pure electric vehicles are an effective solution at this stage. During the driving process of pure electric vehicles, due to the flexible characteristics of the power system, when the drive motor outputs torque, it will cause the entire power system to vibrate during the starting phase, constant speed phase, and acceleration phase, and transmit it to the entire vehicle, seriously affecting driving. Personnel comfort. [0003] In the related art, most of the processing methods for vehicle jitter focus on reducing the vehicle jitter by increasing the slip control of the clutch and blocking the transmission of the rotational speed fluctuation of the drive motor...

AI Technical Summary

Problems solved by technology

However, this technical solution requires an additional device for the clutch, which increases the mechanical structure of the pure electric vehicle and the complexity of the control system, thereby increasing the manufacturing cost of the vehicle

In addition, the above-mentioned technical solution only blocks the speed fluctuation of the drive motor so that the vibration cannot be transmitted to the whole vehicle, but it does not fundamentally eliminate the speed fluctuation of the drive motor

Moreover, this blocking process not only affects the transmission of vehicle power and increases energy consumption, but also the accuracy of vibration control is low

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