Measuring method for toe angle of car

Abstract

The invention discloses a measuring method for a toe angle of a car, which establishes a new measuring device for the toe angle of the car, and uses the device to perform measurement. The method comprises the following steps of: during measuring, separately emitting line lasers from two sides to the opposite side, collecting the data by the opposite cameras, and sending the data to a measuring unit for measurement and calculation; starting the working of the cameras; acquiring the current images of the cameras for processing; acquiring the images once from the cameras for processing after theprocessing is completed, and so on; calculating the threshold value of the monochromatic light component of each image by extracting a maximum monochromatic light component of the acquired image everytime; selecting N rows of pixel points on a projection surface, sequentially dividing the pixel points of each row according to the threshold value, and obtaining the divided effective pixel points in each row; calculating the center position of the effective pixel points by using the effective pixel points; and calculating the offset distance of the line laser projections by using the central position, so as to calculate the offset angle. The calculation method is rapid and simple, and has high precision.

Description

technical field [0001] The invention relates to an angle measurement method, in particular to an automobile toe angle measurement method. Background technique [0002] The toe-in of the car refers to the distance difference between the front-end face of the front wheel and the rear end face in the transverse direction of the car, and it can also refer to the angle between the forward direction of the car body and the plane of the front wheel, which is called the toe-in angle at this time. The toe-in of the front wheels is an important parameter to ensure that the car runs stably in a straight line and enables the steering wheels to automatically return to the center. [0003] At present, the measurement methods of the toe angle mainly include line drawing method, measuring ruler, wire drawing method, laser measurement method, and 3D car locator. Among them, the marking method, the measuring ruler and the wire-drawing measurement method are all manually measured, and the mea...

AI Technical Summary

Problems solved by technology

Among them, the scribing method, measuring ruler and wire-drawing measurement method are all measured manually, the measurement accuracy is low, the error is large, the measurement process is cumbersome, and the accuracy of electronic measurement cannot be achieved.

However, the 3D locator instrument is bulky and fixed, and cannot be carried or moved as needed

The current laser measurement method adopts the method of direct light reception, and its accuracy and reliability are not high

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