Method for restraining starting shake of pure electric vehicle

Abstract

The invention relates to a pure electric vehicle, particularly to the starting shake of the pure electric vehicle. When the electric vehicle is started, and power is transferred by the output torque of a motor through a transmission system, the torque with nonlinear changes is transferred during transient transition. The step length of the expected torque responded by a motor, of the whole vehicle, is properly magnified, and simultaneously, a rotating speed feedback link is increased to correct the expected torque of the whole vehicle. The rotating speed feedback link comprises five parts: motor rotating speed detection, a low pass filter, motor rotating speed differential, an inertia link and limiting amplitude output. Through the rotating speed feedback link, the torque for correcting the expected torque can be estimated, the dynamic response process of the transmission system can be improved when the power is transferred, the effect of restraining the starting shake is achieved, and the acceleration performance of the whole vehicle is taken into account.

Description

technical field [0001] The invention relates to a pure electric vehicle, in particular to the starting vibration of a pure electric vehicle. Background technique [0002] For pure electric vehicles, a single-stage reducer is usually used to replace the multi-speed gearbox (or a direct drive structure) in a traditional car. Since the drive train is rigidly connected, there is a large gap between the gears, and the moment of inertia of the traction motor itself is also large. Small, when the output torque of the motor jumps instantaneously during the starting process, it will cause elastic deformation of the transmission system, and the transmission system During the transient transition of power transmission, the vehicle traction torque and motor output torque There is a nonlinear relationship between them, and there is a jitter phenomenon; the transmission system During the steady-state process of power transmission, the vehicle traction torque and motor output torq...

AI Technical Summary

Problems solved by technology

This method can improve the phenomenon of starting vibration, but at the same time, it will cause the motor to respond slowly to the expected torque, which will affect the acceleration performance of the whole vehicle.

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