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Failure detecting device and method for automobile damper

A fault test and shock absorber technology, applied in the automotive field, can solve the problems of the influence of the test results of the machining error of the eccentric wheel 6, the lack of displacement sensors, and the influence of the accuracy of the test results.

Inactive Publication Date: 2003-03-19
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following shortcoming in above-mentioned test method: (1) apply energy storage flywheel 12 and lack displacement sensor 10 on existing automobile shock absorber failure test device, have influenced the accuracy of test result; (2) because automobile shock absorber damping coefficient c 1 and car body mass m 1 , car wheel mass m 2 All have greater influence to the test result of adhesion percentage A, so prior art only adopts single evaluation index---adhesion percentage A can cause larger misjudgment rate to automobile shock absorber evaluation; (3) this test In the method, the machining error of the eccentric wheel 6 will also have a certain influence on the test results

Method used

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  • Failure detecting device and method for automobile damper
  • Failure detecting device and method for automobile damper
  • Failure detecting device and method for automobile damper

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Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Embodiment: 1) test vehicle type: common Santana, the eccentric distance e of the eccentric wheel 6 of test bench selects following size for use: 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, use prior art and test result of the present invention respectively For comparison, see Table 2 below. As can be seen from Table 2, the machining accuracy of the eccentric wheel of the present invention has substantially no influence on the test results.

[0026] this invention

current technology

Eccentric distance emm

Adhesion percentage A

Damping ratio ζ

Adhesion percentage A

2

63.5

0.32

76.4

2.5

64.2

0.30

70.5

3

63.9

0.31

64.6

3.5

63.1

0.31

58.7

4

64.5

0.31

52.8

[0027] 2) test vehicle type: common Santana, as can be seen from Table 3, under the test condition of serial numb...

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Abstract

The present invention belongs to the field of automobile detection. The failure detecting device for automobile damper features the digital frequency variator, rather than energy accumulating flywheel, used for altering the rotation speed of AC motor for excitation of different frequency; and the increased displacement sensor used for measuring the displacement of the test stage. New failure detecting method is realized with the device. The present invention evaluates automobile damper with two evaluation indexes including additional percentage A and damping ratio zeta to raise the measuring accuracy.

Description

Technical field: [0001] The invention belongs to the field of automobiles, and relates to a testing device for non-disintegrating fault diagnosis of automobile shock absorbers and a new testing method. Background technique: [0002] Most of the automobile shock absorbers are tested by the mechanical vibration table directly driven by the eccentric wheel, and the automobile shock absorber is evaluated by using a single evaluation index—adhesion percentage A, as shown in figure 1 shown. First, park the vehicle wheel P on the test platform 2, and use the force sensor 5 to measure the force acting on the test platform 2 when the vehicle wheel P is stationary, which is defined as the wheel static load W. Secondly, through the AC motor 8 installed on the base 1 of the test bench through the flexible coupling 7 at a rated speed of 1440r / min, the eccentric wheel 6 is driven to rotate, and the test bench 2 equipped with the spring 3 and the linear bearing 4 is driven to generate ver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/04
Inventor 周建鹏曹永上陈昌锡徐兆坤严运兵诸琦
Owner SHANGHAI UNIV OF ENG SCI
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