Method for measuring minimum turning radius of automobile

Abstract

The invention discloses a method for measuring the minimum turning radius of an automobile, and the method comprises the steps: arranging scanning positioning points in front of the automobile, on a front bumper and on a transition plate, and collecting the scanning positioning points to obtain a horizontal plane 3D point cloud image and a corner-free 3D point cloud image; controlling a steering wheel to turn left to a limit angle, and sequentially advancing for two distances to obtain two left-turn 3D point cloud images; controlling the steering wheel to turn right to a limit angle, and sequentially advancing for two distances to obtain two right-turn 3D point cloud images; the horizontal plane 3D point cloud image, the corner-free 3D point cloud image, the left-turn 3D point cloud image and the right-turn 3D point cloud image are processed to obtain a left track circle and a right track circle, and the average value of the radius of the left track circle and the radius of the right track circle is taken as the turning radius of the automobile. According to the method, the turning outmost contour line can be quickly, effectively and accurately obtained without other tools or equipment, the problem that the turning outmost convex point cannot be determined is solved, the minimum turning radius can be quickly and accurately obtained through excircle fitting, and the precision is high.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a method for measuring the minimum turning radius of an automobile. Background technique [0002] The minimum turning radius is an important parameter to measure the passing ability of the car, which represents the passing ability of the car in narrow and curved areas. The smaller the minimum turning radius, the better the maneuverability of the car. According to the difference of measurement boundary and application scenario, the following two radii are corresponding. [0003] The minimum turning radius (dimension code D101) refers to the radius of the track circle over which the center surface of the outer steering wheel rolls on the support plane when the steering wheel turns to the limit position, the car turns and drives at the lowest stable speed; Passability on the road. [0004] The minimum turning radius (dimension code D102) refers to the radius of the...

AI Technical Summary

Problems solved by technology

When measuring the angle in this patent, the left and right edges of the front wheels can only be visually located, and cannot be precisely positioned; the formula and steps for calculating the angle are complex, and there are large errors; the minimum turning radius is also a calculated value, and the wheelbase L is required , but there is no accurate measurement method for the wheelbase, and this method cannot be used to measure the minimum turning radius (size code D102)

[0008] Patent CN108845569A discloses a semi-automatic point cloud method for generating three-dimensional high-definition road map horizontal curve lanes, the steps are: S1, dividing the original point cloud data into several data blocks; S2, dividing the outline grid in each data block Select the main point in each grid cell; S3, extract the curb points from the original point cloud data; S4, fit the extracted curb points into two smooth roadsides to extract road surface points; S5, Perform IDW interpolation method on road surface points to generate GRF intensity feature image; S6, extract and denoise road markings; S7, classify discrete road marking points; S8, fit clustering curve road markings to obtain level Traffic lanes on curved roads; S9. Adjust traffic lanes based on existing knowledge, this method cannot be used to measure the minimum turning radius (size code D102)

[0009] The existing technologies are all about the measurement of the minimum turning radius (size code D101), and there are certain limitations. At present, there is no measurement of the minimum turning radius (size code D102)

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