Method, device and system for suppressing shaking of electric automobile

A technology for electric vehicles and electric current, which is applied in the direction of suppressing motor vibration control, electric vehicles, and control drives, etc. It can solve problems such as reducing the working performance and life of the transmission system, speed jitter, and motor output torque fluctuations

Active Publication Date: 2018-05-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method, device and system for suppressing shaking of electric automobile
  • Method, device and system for suppressing shaking of electric automobile

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0113] see image 3 , which is a flowchart of a method for suppressing vibration of an electric vehicle provided in this embodiment. The method includes:

[0114] Step 301: Obtain the rotational speed signal of the motor.

[0115] Specifically, when collecting the speed of the motor, a speed sensor such as a resolver can be used to collect the speed of the motor. After obtaining the analog signal of the speed, the analog signal is sent to the motor controller, and the motor controller converts the analog signal into a digital signal, and sends the The digital signal is decoded to obtain the corresponding speed signal.

[0116] Step 302: Perform Fourier analysis on the rotational speed signal to obtain the frequency and amplitude of the effective component in the rotational speed signal that causes the rotational speed jitter; the rotational speed jitter is the jitter caused by the non-linear relationship between the traction torque and resistance torque of the electric vehic...

Embodiment 2

[0136] see Figure 4 , the method for suppressing the vibration of the electric vehicle provided in this embodiment includes:

[0137] Step 401: Collect the motor speed to obtain a corresponding speed signal.

[0138] The implementation method of step 401 is the same as the implementation method of step 301 in the first method embodiment, and will not be repeated here.

[0139] Step 402: Perform Fourier analysis on the rotational speed signal to obtain the amplitude of each component in the rotational speed signal.

[0140] Perform Fourier analysis on the speed signal obtained in step 401. The essence of Fourier transform is to convert a time-domain waveform into the frequency domain for decomposition, and decompose it into the sum of sine waves of different frequencies. Therefore, using Fourier The transformation analyzes the rotational speed signal, and can detect the amplitude and phase information of each frequency component in the rotational speed signal.

[0141] The ...

Embodiment 3

[0182] see Figure 7 , is a flow chart of the method for suppressing the increased current jitter based on the speed jitter suppression method.

[0183] Step 701: Obtain a direct-axis current deviation signal and a quadrature-axis current deviation signal of the motor.

[0184] Specifically, the deviation signal of the direct-axis current and the deviation signal of the quadrature-axis current of the motor may be obtained through a current sensor such as a Hall element.

[0185] Step 702: Perform Fourier analysis on the motor direct-axis current deviation signal and the quadrature-axis current deviation signal respectively to obtain the frequency and amplitude of the effective components in the direct-axis current and the quadrature-axis current that cause current jitter.

[0186] The Fourier analysis is performed on the direct axis current deviation signal and the quadrature axis current deviation signal respectively, and the amplitudes of each component in the direct axis c...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20H02P23/04
CPCB60L15/20H02P23/04Y02T10/64Y02T10/72
Inventor 唐杰张涛
Owner HUAWEI TECH CO LTD
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