Electric vehicle jitter suppression method and device, electric vehicle and storage medium

Abstract

The invention discloses an electric vehicle jitter suppression method and device, an electric vehicle and a storage medium. The method comprises the steps of obtaining the motor rotating speed of the electric vehicle in real time; establishing a motor rotating speed model according to the motor rotating speed; identifying the motor rotating speed model by adopting a recursive least square algorithm to obtain to-be-identified parameters of the motor rotating speed model; performing reconstruction processing on the motor rotating speed model according to the to-be-identified parameters to obtain a rotating speed jitter amount; generating a torque compensation value according to the rotating speed jitter amount; and superposing the torque compensation value and the given torque to suppress the jitter of the electric vehicle. According to the method, the recursive least square algorithm is adopted to identify the established motor rotating speed model, then the torque compensation value is generated according to the rotating speed jitter amount obtained by an identification result, and the torque compensation value and the given torque are superposed to control the motor, so that the jitter of the electric vehicle can be effectively inhibited, the riding comfort is improved, and the working performance and the service life of a transmission system are improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vibration suppression method and device for an electric vehicle, an electric vehicle and a storage medium. Background technique [0002] Pure electric vehicles mostly adopt the powertrain form of integrated drive of motor and transmission, and drive the wheels through secondary gears, reducer / differential and left and right half shafts. This direct coupling and constant meshing structure is conducive to obtaining better acceleration performance, but at the same time it brings the problem of shafting vibration. This kind of vibration is especially obvious when the motor torque changes rapidly, specifically the sudden increase of large positive / negative torque during rapid acceleration / deceleration, and the torque interference caused by external factors during the shaft transmission process. Since the motor output torque can be directly controlled by the controller according...

AI Technical Summary

Problems solved by technology

This method can better suppress the DC offset, but the phase offset is generated at the jitter frequency, so that the AC component of the feedback cannot follow the speed jitter synchronously, and the suppression effect on the speed jitter is limited.

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