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Method for acquiring vibration noise contour domain diagram of electric driving system

An electric drive system, vibration and noise technology, applied in the direction of measuring vibration, vibration measurement in solids, testing of mechanical components, etc.

Pending Publication Date: 2021-11-16
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for obtaining the high-level map of the vibration and noise of the electric drive system to guide the rectification and control of the vibration and noise problems of the whole vehicle

Method used

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  • Method for acquiring vibration noise contour domain diagram of electric driving system
  • Method for acquiring vibration noise contour domain diagram of electric driving system
  • Method for acquiring vibration noise contour domain diagram of electric driving system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The concrete process of this embodiment is as follows:

[0050] (1) Obtain the torque and speed change curve of the external characteristics of the electric drive system during the acceleration process

[0051] ① Combined with the motor performance parameters, obtain the motor external characteristic curve (torque / time, speed / time) according to the following formula and bench test, such as figure 1 as shown, figure 1 The solid line represents torque, and the dashed line represents power.

[0052] T=K*P / R

[0053] Among them, K is a constant of 9550, T is the motor torque (Nm), P is the motor power (KW), and R is the motor speed (r / min).

[0054] ② According to the area included in the torque curve, select the appropriate torque and speed point within its range. Taking the electric drive system of a vehicle as an example, the peak torque of the motor is 320Nm, the peak power is 120KW, and the maximum speed is 12000RPM. The selected speed and torque points to be teste...

Embodiment 2

[0082] Taking an electric light bus model as an example, its electric drive system consists of a motor, a transmission, and a controller. The main noise sources are transmission gear meshing noise and electromagnetic noise. In the early stage of the development of this model, engineers conducted vibration and noise testing and analysis on the electric drive system of this model, obtained high-level maps of vibration and noise, and judged which points are forbidden areas for vibration and noise, and compared them with the vibration and noise under the vehicle's working conditions. Compare and evaluate its accuracy.

[0083] Predict the abnormal vibration and noise of the electric drive system in advance:

[0084] Judging from the contour diagram of the 8.63-order gear meshing vibration of the electric drive system, the magnitude of vibration is large at 2500-3500RPM on the abscissa and 25-70Nm on the ordinate, such as Figure 8 As shown, it can be judged that there is abnormal...

Embodiment 3

[0089] Guide the MCU calibration to avoid high-noise areas reasonably:

[0090] From the contour map of the 48th-order electromagnetic noise of the electric drive system, in Figure 9 The noise in the area of ​​7000-10000rpm on the abscissa and 150-200Nm on the ordinate will be more serious, which may cause complaints from customers. When requiring the MCU to calibrate, try to avoid this area under the premise of meeting other performance requirements to avoid complaints.

[0091] The electric drive system was loaded into the vehicle for testing and driving evaluation. Under the full switch acceleration condition, there is high-frequency harsh noise in the range of 80-110Km / h. Judging from the vehicle test data, the noise belongs to the 48th-order electromagnetic noise of the motor.

[0092] Under other attribute requirements, adjust the full-switch acceleration torque curve through MCU calibration to keep it away from the area of ​​7000-10000rpm on the abscissa and 100-200Nm...

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Abstract

The invention relates to a method for obtaining a vibration noise contour domain diagram of an electric driving system, and belongs to the technical field of vibration noise control of new energy automobile type electric driving systems. The method comprises the following steps of: step 1, acquiring a torque and rotating speed change curve in the external characteristic acceleration process of the electric driving system; step 2, according to required test points, compiling vibration noise contour domain rack test working conditions and requirements; step 3, installing the electric driving system on a dynamometer rack, and installing vibration noise testing equipment on the related measuring point of the electric driving system; step 4, carrying out rack test operation; step 5, analyzing vibration noise contour domain diagram data; and 6, drawing a vibration noise contour domain diagram. The method is used for obtaining a complete vibration noise contour diagram, determining a vibration noise forbidden zone of the electric driving system, and guiding rectification and control of the vibration noise problem of a whole vehicle.

Description

technical field [0001] The invention relates to a test and analysis method for an electric drive system, in particular to a method for obtaining a high-level map such as vibration and noise of the electric drive system. The invention belongs to the technical field of vibration and noise control of electric drive systems of new energy vehicles. Background technique [0002] In the field of new energy vehicles, there is no research literature on the high-level map of vibration and noise of the electric drive system bench. Contour map is an expression method to show the characteristics of three-dimensional data in the form of planar map, and is used to reflect the relationship between three variables. The abscissa is the rotational speed, the first ordinate is the torque, and the second ordinate is the vibration or noise value. [0003] Commonly used in geography, contour lines refer to closed curves formed by connecting points of equal elevation on topographic maps. In addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/14G01H1/16G01H17/00G01M13/00G01M13/021G01M13/028
CPCG01H1/14G01H1/16G01H17/00G01M13/00G01M13/021G01M13/028
Inventor 王轮陈清爽钟秤平郭峰万琪
Owner JIANGLING MOTORS
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