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A detection method of four-wheel aligner based on image analysis

A four-wheel aligner and detection method technology, applied in the direction of instruments, measuring devices, calculations, etc., can solve the problems of low precision, cumbersome operation, slow detection speed, etc., meet the requirements of accuracy and breadth, avoid measurement errors, and operate convenient effect

Active Publication Date: 2021-06-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, these instruments have problems such as many sensors required, complex calibration, cumbersome operation, slow detection speed, and low precision, which cannot achieve fast detection and cannot meet the development requirements of the automotive inspection industry.

Method used

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  • A detection method of four-wheel aligner based on image analysis
  • A detection method of four-wheel aligner based on image analysis
  • A detection method of four-wheel aligner based on image analysis

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Embodiment

[0042] combine Figure 1~4 , the steps of the four-wheel aligner detection technology based on image analysis proposed by the present invention are as follows:

[0043] Step 1: Equipment installation and image acquisition

[0044] In the field of machine vision, the higher the resolution of the camera, the higher the accuracy achieved. However, if the image size is too large, it will affect the calculation and transmission. It is very important to choose the appropriate resolution. The present invention expects the accuracy to reach 1', so at least one pixel is required to reflect 1', the measurement range must reach 20°, and the resolution must reach 1200. The friendly 200W pixel camera selected here has a resolution of 1600*1200.

[0045]Before the measurement starts, place a laser in the center of the vertical wheel plane, and place a receiving surface 1m parallel to the wheel. The design size of the receiving panel is 170*180mm, which can ensure the measurement range. Ins...

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Abstract

The invention discloses a detection method for a four-wheel aligner based on image analysis. The steps are as follows: first place a laser light source at the wheel axis, and place a receiving surface parallel to a certain position from the wheel. When the toe angle and camber angle of the wheel start to change, the camera of the image acquisition system acquires the image of the receiving surface and transmits it to the ARM hardware platform; ARM analyzes and processes the acquired image, including grayscale processing, Gaussian filtering and edge detection, and then uses the grayscale center of gravity method to calculate the pixel position of the laser spot on the receiving surface; finally, by coordinate transformation and spatial geometry knowledge, The toe angle and camber angle of the wheel can be determined, and then transmitted to the host computer to realize human-computer interaction. The method of the invention has the advantages of simple operation, real-time, high efficiency and high detection precision.

Description

technical field [0001] The invention belongs to the technical field of measurement and detection, in particular to a detection method for a four-wheel aligner based on image analysis. Background technique [0002] Four-wheel alignment is an important item among various inspection indicators of automobiles. It is mainly used to adjust the spatial relative positions of the four tires of the automobile, and has a decisive impact on the safety and reliability of the entire vehicle. There are two types of content to be checked in four wheel alignment: front wheel alignment and rear wheel alignment. Front wheel alignment includes caster angle, kingpin inclination angle, wheel camber angle, wheel toe angle, containment angle, etc., rear wheel alignment includes thrust angle, rear wheel camber angle, rear wheel toe angle, axle deflection angle etc., the most important thing is the measurement of the toe angle and camber angle. Among them, the toe angle of the wheel can reduce tire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62G06K9/46G06K9/40G01B11/275
CPCG01B11/275G06V10/30G06V10/44G06F18/22
Inventor 房红兵张吉璇高建坡林英豪任智博
Owner NANJING UNIV OF SCI & TECH
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