CN108801133B - Method for detecting vehicle body characteristic line position drop - Google Patents
Method for detecting vehicle body characteristic line position drop Download PDFInfo
- Publication number
- CN108801133B CN108801133B CN201810379162.9A CN201810379162A CN108801133B CN 108801133 B CN108801133 B CN 108801133B CN 201810379162 A CN201810379162 A CN 201810379162A CN 108801133 B CN108801133 B CN 108801133B
- Authority
- CN
- China
- Prior art keywords
- point
- line
- tangent
- characteristic
- characteristic line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Abstract
According to an embodiment of the present invention, a method for detecting a vehicle body characteristic line position drop is provided, including: making section lines perpendicular to the characteristic lines at the matching positions of the characteristic lines; determining a starting point and an end point of the characteristic line on the section line; determining a comparison reference point on the section line according to the starting point and the end point; the positional drop of the characteristic line is determined based on the comparison reference point. The detection method of the vehicle body characteristic line position drop can determine comparison reference points in a unified mode, and each comparison reference point is placed in the same reference coordinate system, so that quantized position drop data can be obtained, and evaluation and correction are facilitated.
Description
Technical Field
The invention relates to a detection technology in an automobile manufacturing process, in particular to a method for detecting the position drop of a characteristic line of an automobile body among different parts.
Background
With the change of aesthetic appearance of automobiles and the improvement of stamping processes, various decorative lines are increasingly used on vehicle bodies to decorate the appearance of vehicles. At present, the body characteristic line (also called rib line or waist line) has become an indispensable feature in the design of the automobile appearance. Fig. 1 discloses a schematic view of a body characteristic line involved in the design process of a whole vehicle.
However, the whole vehicle body is composed of a plurality of components, such as four doors, front and rear covers, side walls, fenders, front and rear bumpers, front and rear headlights, and the same characteristic line often passes through several components in order to pursue the appearance and integrity of the vehicle body. Fig. 2 discloses a schematic view of the same characteristic line through several parts. By design, the same characteristic line across several components should be consistent, that is, the body characteristic lines need to be aligned with each other at the mating interface of the components. In practice, however, due to variations in manufacturing and assembly processes, when two adjacent components are matched, the same characteristic line is often misaligned.
Fig. 3a and 3b show schematic views of the same characteristic line with a drop in position on different components. Fig. 3b is a partial enlarged view of fig. 3 a. From the overall perspective, the characteristic lines on the two parts have a position drop and are not aligned. However, since the characteristic line usually has a certain width, and the section of the characteristic line is not a regular circular arc or a regular geometric feature, it is difficult to determine the accurate position of the characteristic line, and further difficult to make a specific quantitative evaluation on the position difference of the characteristic line. This results in inefficient correction of the problem of characteristic line position drop. Because there is no accurate quantitative data, only the whole observation feeling can be relied on to evaluate whether the characteristic lines are aligned, so that the evaluation accuracy and efficiency are low.
Disclosure of Invention
The invention aims to provide a method for detecting the fall of a characteristic line of a vehicle body at a matching position of vehicle body parts.
According to an embodiment of the present invention, a method for detecting a vehicle body characteristic line position drop is provided, including:
making section lines perpendicular to the characteristic lines at the matching positions of the characteristic lines;
determining a starting point and an end point of the characteristic line on the section line;
determining a comparison reference point on the section line according to the starting point and the end point;
the positional drop of the characteristic line is determined based on the comparison reference point.
In one embodiment, the detection method further comprises the steps of acquiring point cloud information of the surface of the vehicle body part through an optical device, and carrying out the detection method based on the point cloud information.
In one embodiment, determining the start and end points of the feature line on the cross-sectional line comprises:
constructing a curve of curvature values along the section line;
and finding the abrupt change point of the curvature of the section line, wherein the abrupt change point is the starting point and the end point of the characteristic line on the section line.
In one embodiment, determining the comparison reference point on the section line from the start point and the end point comprises:
constructing a starting point tangent line at the starting point, wherein the starting point tangent line is tangent to the section line and the starting point is a tangent point;
constructing an end point tangent line at the end point, wherein the end point tangent line is tangent to the section line and the end point is a tangent point;
determining the intersection point of the starting point tangent line and the end point tangent line;
and determining the projection point of the intersection point on the section line, wherein the projection point is a comparison reference point.
In one embodiment, determining the projection point of the intersection point on the section line comprises:
finding a vertical line which passes through the intersection point and is vertical to the section line;
the intersection point of the vertical line and the section line is a projection point.
In one embodiment, the detection method further comprises: and setting a reference coordinate system, placing each comparison reference point in the reference coordinate system to obtain coordinate values, and calculating the position difference value of the characteristic line based on the coordinate values.
The detection method of the vehicle body characteristic line position drop can determine comparison reference points in a unified mode, and each comparison reference point is placed in the same reference coordinate system, so that quantized position drop data can be obtained, and evaluation and correction are facilitated.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
fig. 1 discloses a schematic view of a body characteristic line involved in the design process of a whole vehicle.
Fig. 2 discloses a schematic view of the same characteristic line through several parts.
Fig. 3a and 3b show schematic views of the same characteristic line with a drop in position on different components.
Fig. 4 is a schematic diagram showing the cross-sectional lines of the characteristic lines in the method for detecting the position drop of the characteristic lines of the vehicle body according to the embodiment of the invention.
Fig. 5 is a schematic diagram showing a curve of curvature values of section lines in a method for detecting a position drop of a body characteristic line according to an embodiment of the present invention.
Fig. 6 discloses a schematic diagram of the starting point and the ending point of the characteristic line in the method for detecting the position drop of the vehicle body characteristic line according to the embodiment of the invention.
Fig. 7 is a schematic diagram illustrating a start point tangent line and an end point tangent line in a method for detecting a position drop of a body characteristic line according to an embodiment of the invention.
Fig. 8 is a schematic diagram illustrating the determination of the intersection point of the start point tangent and the end point tangent in the method for detecting the position difference of the body characteristic line according to the embodiment of the invention.
Fig. 9 is a schematic diagram for determining a comparison reference point in the detection method of the body characteristic line position drop according to an embodiment of the invention.
Fig. 10 is a schematic diagram illustrating the determination of the position drop value in the method for detecting the position drop of the body characteristic line according to an embodiment of the present invention.
Detailed Description
The invention aims to provide a method capable of detecting the position drop of a characteristic line of a vehicle body, and in one embodiment, the method comprises the following steps:
102. and acquiring point cloud information of the surface of the vehicle body part through optical equipment. In one embodiment, the detection method is based on point cloud information.
104. And making section lines perpendicular to the characteristic lines at the matching positions of the characteristic lines. Fig. 4 is a schematic diagram showing the cross-sectional lines of the characteristic lines in the method for detecting the position drop of the characteristic lines of the vehicle body according to the embodiment of the invention. Referring to fig. 4, a cross-sectional line 204 perpendicular to the characteristic line 202 is formed at the matching position of the adjacent components. Typically the characteristic line has a curved surface, so the cross-sectional line 204 is a curved line.
106. And determining the starting point and the end point of the characteristic line on the section line. In one embodiment, determining the start and end points of the feature line on the cross-sectional line comprises the steps of:
a curve of curvature values was constructed along the section line. Fig. 5 is a schematic diagram showing a curve of curvature values of section lines in a method for detecting a position drop of a body characteristic line according to an embodiment of the present invention. Referring to FIG. 5, a curve 206 of curvature values is constructed along section line 204.
And finding the abrupt change point of the curvature of the section line, wherein the abrupt change point is the starting point and the end point of the characteristic line on the section line. Since the characteristic line is projected or recessed from the vehicle body surface, there is a sharp boundary at the boundary between the characteristic line and the vehicle body surface. From the view point of the curve of the curvature value of the section line, the section curvature is suddenly changed at the junction of the characteristic line and the surface of the vehicle body. Therefore, the points at which the cross-sectional curve curvature value changes abruptly are the starting point and the ending point of the characteristic line. Fig. 6 discloses a schematic diagram of the starting point and the ending point of the characteristic line in the method for detecting the position drop of the vehicle body characteristic line according to the embodiment of the invention. Referring to fig. 6, the start 208 and end 210 of the feature line are determined according to the discontinuity point of the cross-sectional line curvature value.
108. And determining a comparison reference point on the section line according to the starting point and the end point. In one embodiment, the determination of the comparison reference point on the section line as a function of the starting point and the end point comprises the following steps:
a starting point tangent is constructed at the starting point, the starting point tangent is tangent to the section line and the starting point is the tangent point.
And constructing an endpoint tangent at the endpoint, wherein the endpoint tangent is tangent to the section line and the endpoint is the tangent point.
Fig. 7 is a schematic diagram illustrating a start point tangent line and an end point tangent line in a method for detecting a position drop of a body characteristic line according to an embodiment of the invention. Referring to FIG. 7, a start point tangent 212 is constructed at the start point 208, the start point tangent 212 is tangent to the section line 204 and the start point 208 is the tangent point. An endpoint tangent 214 is established at the endpoint 210, the endpoint tangent 214 being tangent to the cross-sectional line 204 and the endpoint 210 being the tangent point.
And determining the intersection point of the starting point tangent line and the end point tangent line. Fig. 8 is a schematic diagram illustrating the determination of the intersection point of the start point tangent and the end point tangent in the method for detecting the position difference of the body characteristic line according to the embodiment of the invention. The start point tangent 212 and the end point tangent 214 are extended inward (the inward direction is a direction toward the inside of the feature line), and an intersection 216 of the start point tangent 212 and the end point tangent 214 is determined.
And determining the projection point of the intersection point on the section line, wherein the projection point is a comparison reference point. Fig. 9 is a schematic diagram for determining a comparison reference point in the detection method of the body characteristic line position drop according to an embodiment of the invention. In one embodiment, determining the projection point of the intersection point on the section line comprises the steps of: a perpendicular line is found through the intersection point 216 and perpendicular to the section line. The intersection of the vertical line and the section line 204 is the projection point 218.
110. The positional drop of the characteristic line is determined based on the comparison reference point. In one embodiment, the detection method further comprises the steps of: and setting a reference coordinate system, placing each comparison reference point in the reference coordinate system to obtain coordinate values, and calculating the position difference value of the characteristic line based on the coordinate values. Fig. 10 is a schematic diagram illustrating the determination of the position drop value in the method for detecting the position drop of the body characteristic line according to an embodiment of the present invention. Referring to fig. 10, the comparison reference point a of the front door section has a Z-direction coordinate of +706.44mm in the reference coordinate system, and the comparison reference point B of the rear door section has a Z-direction coordinate of +704.10mm in the reference coordinate system. Since the comparison reference points A and B are arranged in the same reference coordinate system, the comparison reference points A and B can be determined to have position difference in the Z direction, and the position difference is (706.44-704.10) mm. According to the position difference value, the parts can be adjusted, so that the comparison reference points of the parts are aligned with each other.
The detection method of the vehicle body characteristic line position drop can determine comparison reference points in a unified mode, and each comparison reference point is placed in the same reference coordinate system, so that quantized position drop data can be obtained, and evaluation and correction are facilitated.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (4)
1. A detection method for the position drop of a vehicle body characteristic line is characterized by comprising the following steps:
making section lines perpendicular to the characteristic lines at the matching positions of the characteristic lines;
determining the starting point and the end point of the characteristic line on the section line, comprising: constructing a curve of curvature values along the section line; finding a mutation point of the curvature of the section line, wherein the mutation point is a starting point and an end point of a characteristic line on the section line;
determining a comparison reference point on the section line according to the starting point and the end point, comprising: constructing a starting point tangent line at the starting point, wherein the starting point tangent line is tangent to the section line and the starting point is a tangent point; constructing an end point tangent line at the end point, wherein the end point tangent line is tangent to the section line and the end point is a tangent point; determining the intersection point of the starting point tangent line and the end point tangent line; determining a projection point of the intersection point on a section line, wherein the projection point is a comparison reference point;
the positional drop of the characteristic line is determined based on the comparison reference point.
2. The method for detecting the position difference of the vehicle body characteristic line according to claim 1, further comprising acquiring point cloud information of the surface of the vehicle body part by an optical device, and performing the detection method based on the point cloud information.
3. The method for detecting the position drop of the vehicle body characteristic line according to claim 1, wherein the step of determining the projection point of the intersection point on the section line comprises:
finding a vertical line which passes through the intersection point and is vertical to the section line;
and the intersection point of the vertical line and the section line is a projection point.
4. The method for detecting the position drop of the vehicle body characteristic line according to claim 1, further comprising:
and setting a reference coordinate system, placing each comparison reference point in the reference coordinate system to obtain coordinate values, and calculating the position difference value of the characteristic line based on the coordinate values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379162.9A CN108801133B (en) | 2018-04-25 | 2018-04-25 | Method for detecting vehicle body characteristic line position drop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379162.9A CN108801133B (en) | 2018-04-25 | 2018-04-25 | Method for detecting vehicle body characteristic line position drop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108801133A CN108801133A (en) | 2018-11-13 |
| CN108801133B true CN108801133B (en) | 2020-03-10 |
Family
ID=64092993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810379162.9A Active CN108801133B (en) | 2018-04-25 | 2018-04-25 | Method for detecting vehicle body characteristic line position drop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108801133B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485427B (en) * | 2022-01-20 | 2023-09-22 | 上汽大众汽车有限公司 | Measurement reference construction method and system for vehicle body size measurement |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59220471A (en) * | 1983-05-30 | 1984-12-11 | Toyota Motor Corp | Position detector for car character line |
| CN102201017A (en) * | 2010-03-23 | 2011-09-28 | 帝特汽车技术(上海)有限公司 | Optimal design method for automotive body |
| CN102257362A (en) * | 2008-12-18 | 2011-11-23 | 微-埃普西龙测量技术有限两合公司 | Sensor arrangement and method for determining the position and/or change in position of a measurement object |
| CN103033130A (en) * | 2011-10-04 | 2013-04-10 | 株式会社迪思科 | Method of detecting condensing spot position in laser beam processing apparatus |
| JP2015225546A (en) * | 2014-05-28 | 2015-12-14 | 本田技研工業株式会社 | Object detection device, drive support apparatus, object detection method, and object detection program |
| CN105313779A (en) * | 2014-06-10 | 2016-02-10 | Lg电子株式会社 | Around view provision apparatus and vehicle including the same |
| CN105829206A (en) * | 2013-12-18 | 2016-08-03 | 丰田自动车株式会社 | Bonding structure of vehicle members and bonding structure of backdoor |
| CN107464263A (en) * | 2016-06-02 | 2017-12-12 | 维森软件技术（上海）有限公司 | Automobile calibration system and its scaling method |
| CN107609255A (en) * | 2017-09-07 | 2018-01-19 | 上汽大众汽车有限公司 | The detection method of vehicle body feature heading line off position |
-
2018
- 2018-04-25 CN CN201810379162.9A patent/CN108801133B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59220471A (en) * | 1983-05-30 | 1984-12-11 | Toyota Motor Corp | Position detector for car character line |
| CN102257362A (en) * | 2008-12-18 | 2011-11-23 | 微-埃普西龙测量技术有限两合公司 | Sensor arrangement and method for determining the position and/or change in position of a measurement object |
| CN102201017A (en) * | 2010-03-23 | 2011-09-28 | 帝特汽车技术(上海)有限公司 | Optimal design method for automotive body |
| CN103033130A (en) * | 2011-10-04 | 2013-04-10 | 株式会社迪思科 | Method of detecting condensing spot position in laser beam processing apparatus |
| CN105829206A (en) * | 2013-12-18 | 2016-08-03 | 丰田自动车株式会社 | Bonding structure of vehicle members and bonding structure of backdoor |
| JP2015225546A (en) * | 2014-05-28 | 2015-12-14 | 本田技研工業株式会社 | Object detection device, drive support apparatus, object detection method, and object detection program |
| CN105313779A (en) * | 2014-06-10 | 2016-02-10 | Lg电子株式会社 | Around view provision apparatus and vehicle including the same |
| CN107464263A (en) * | 2016-06-02 | 2017-12-12 | 维森软件技术（上海）有限公司 | Automobile calibration system and its scaling method |
| CN107609255A (en) * | 2017-09-07 | 2018-01-19 | 上汽大众汽车有限公司 | The detection method of vehicle body feature heading line off position |
Non-Patent Citations (1)
| Title |
|---|
| 白车身样件快速制造在样车试制中的应用;田媛;《汽车工艺与材料》;20100430(第4期);15-20 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108801133A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gallo et al. | CC-RANSAC: Fitting planes in the presence of multiple surfaces in range data | |
| Jiang et al. | Template matching of freeform surfaces based on orthogonal distance fitting for precision metrology | |
| CA2993421C (en) | Object detecting method and object detecting device | |
| CN108801133B (en) | Method for detecting vehicle body characteristic line position drop | |
| KR102639402B1 (en) | An electronic device comprising a patterned housing | |
| US8941731B2 (en) | System and method to verify complete connection of two connectors | |
| CN110555885B (en) | Calibration method and device of vehicle-mounted camera and terminal | |
| CN109094496B (en) | Bumper reinforcement and method of manufacturing a bumper reinforcement | |
| US9285203B1 (en) | Methods and apparatus for determining vehicular assembly tolerances | |
| CN108073274B (en) | Gesture operation method and system based on depth value | |
| JP6520730B2 (en) | Vehicle front grille | |
| US10625691B2 (en) | Automobile, automobile plated part, automobile plated part mold and manufacturing method thereof | |
| JP3221813B2 (en) | Plastic lens | |
| US20200032974A1 (en) | Headlight lens assembly | |
| JPH0354022A (en) | Slider for vehicle door glass | |
| CN210502541U (en) | Clamping device for automobile CD column connecting plate | |
| KR20160043298A (en) | Combining structure of sensor for vehicle | |
| US9904760B2 (en) | Method of producing vehicle ornamentation | |
| CN107426935B (en) | Frame structure, electronic equipment shell and electronic equipment | |
| JP7131327B2 (en) | Target detection device | |
| CN116644522B (en) | Method, device and medium for determining automobile modeling parameters for pneumatic development | |
| JP2013253626A (en) | Fastener | |
| CN108202676B (en) | Vehicle lower structure | |
| CN210545872U (en) | Frame fixed frock that sprays paint before general type car instrument | |
| CN208366300U (en) | Automotive air outlet detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |