The method of 3D locator to realize movable measurement

Abstract

The 3D locator realizes the method of movable measurement, through the detection head clamped on the rear wheel, it measures and calculates the changes in the imaging of the reflective target on the front tire and the reflective target on the car body; the sensor recognizes the The reflective target point on the front tire changes with the reflective target pattern on the car body when the vehicle backs up and rotates at an angle of θ to measure the angle between the rotation axis and the concentric axis, and establish a coordinate system based on the concentric axis. The intersection of the plane where the shaft is located and the concentric axis is the coordinate zero point, and the measurement site can be changed at will. The measurement is composed of a computer plus a communication module, two reflective targets and two detection heads with cameras. The computer is connected to the communication module through the USB port, and the command is sent and the data is transmitted through the wireless network and the two detection heads. The dynamics of the coordinate system Established, mobile measurement can be realized, not limited by the site, and the recognition accuracy is high.

Description

technical field [0001] The invention relates to a vehicle chassis maintenance detection instrument used in automobile maintenance and automobile maintenance industries, in particular to a method for realizing movable measurement by a 3D four-wheel aligner. Background technique [0002] With the development of the automobile industry and the popularization of vehicles, the four-wheel aligner, which is an instrument for vehicle chassis maintenance and testing, is also constantly updating its technology. It has experienced cable, laser, infrared, PSD, CCD, and now the V3D four-wheel aligner. . Mr. Jones Bean in the United States once invented a 3D four-wheel aligner, which measures and restores the car suspension system through multi-point computer vision. Through the camera array distributed on the reference point of the benchmark, the coordinate system is established relying on the benchmark as a reference, and the known calibration frame is used to calibrate the origin of t...

AI Technical Summary

Problems solved by technology

While the advantages of the existing 3D locator appear, it also exposes obvious disadvantages: First, its model relies on the fixed physical position distribution of the camera to establish a measurement system, so the position and site are required to be fixed and cannot be moved. When doing four-wheel alignment, you can only do it in the designated area. If you exceed this area, you will not be able to complete the four-wheel alignment test, and you will not be able to work in any venue or environment; second, due to optical recognition, you cannot use it. 4-column lifts; due to the influence of optical recognition distance, lens refraction and effective use of image sources, the measurement accuracy cannot be achieved; third, the concept of this structure is difficult to develop on the cart locator; fourth , not for outdoor use

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