A method, device and system for suppressing vibration of an electric vehicle

Abstract

The invention discloses a method, device and system for suppressing shaking of an electric automobile. The method, device and system are used for suppressing the shaking of the electric automobile andimproving the driving comfort level. The method includes the steps that a rotation speed signal of a motor is obtained; Fourier analysis is conducted on the rotation speed signal, and the frequency and the amplitude of an effective component, causing rotation speed shaking, in the rotation speed signal are obtained, wherein rotation speed shaking is shaking caused by the non-linear relationship between traction torque and the resistance moment of the electric automobile; according to the frequency and the amplitude of the effective component causing rotation speed shaking, a parameter for suppressing rotation speed shaking is obtained; according to the parameter for suppressing rotation speed shaking and the rotation speed signal, compensation torque is obtained through a differential inertial element and a band-pass filtering element; and the compensation torque and given torque are superposed so as to suppress the rotation speed shaking. Due to the fact that the shaking of the electric automobile is suppressed, mechanical resonance generated in the shaking process is reduced, and therefore hardware wear of the electric automobile is reduced.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to a method, device and system for suppressing shaking of electric vehicles. Background technique [0002] Electric vehicles have the advantages of high efficiency, energy saving, low noise and zero emissions, so electric vehicles are the development trend of new energy vehicles in the future. With the gradual improvement of people's awareness of environmental protection, electric vehicles are more and more popular. [0003] Electric vehicles usually use a reducer to replace the gearbox of a traditional car. The motor and the reducer are connected by a spline, and the reducer and the wheels are connected by a universal joint. Because there is a certain connection gap and flexibility between the spline, reducer and universal joint. [0004] The momentary jump in the output torque of the motor during the starting process of the electric vehicle will cause the ela...

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Problems solved by technology

[0004] When the electric vehicle starts, the output torque of the motor will jump instantaneously, which will cause the elastic deformation of the transmission system, and there will be a nonlinear relationship between the traction torque and the resistance torque, thus causing the speed to jitter

In addition, under certain working conditions of high-speed operation, mechanical resonance will occur in the power transmission system of the vehicle, which will also cause fluctuations in the output torque of the motor, resulting in speed jitter

[0005] The problem of speed jitter not only seriously affects the driving comfort of electric vehicles, but also reduces the working performance and life of the transmission system

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