CN-121994114-A - Front bumper assembly preassembled camera angle detection method

CN121994114ACN 121994114 ACN121994114 ACN 121994114ACN-121994114-A

Abstract

The invention discloses a pre-installed camera angle detection method for a front bumper assembly, which comprises the steps of preparing a reference camera simulation block, accurately positioning the front bumper assembly assembled with the simulation block on a detection tool to enable the extension part to form a preset matching relation with a detection surface of a large reference detection block fixed on the detection tool, providing X, Y, Z references in three mutually perpendicular directions, measuring actual gaps or surface differences between the extension part and the reference surface in the three directions by using a clearance gauge and a surface difference gauge, and finally judging whether the rolling angle, the heading angle and the pitch angle of a camera are qualified or not by comparing the actual measured values with preset standard values. The invention converts the precise measurement of the internal space angle into the simple detection of the external linear dimension, has the advantages of simple and quick operation, high detection efficiency, low cost, easy popularization and implementation on a production line and the like, and can realize the rapid full detection of each batch of products.

Inventors

LI DAQIANG
HU XUECHUAN
ZHAO BING
YANG YAO
LI LI

Assignees

重庆平伟汽车零部件有限公司

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (7)

1. The front bumper assembly preassembled camera angle detection method is characterized by comprising the following steps of: Step one, the gauge structure installation and reference establishment comprises a front guard assembly gauge (2), wherein the front guard assembly gauge (2) comprises a workbench (22) provided with a locating pin, a locating hole and a clamping mechanism, and a large reference detection block (3) fixed on the workbench (22) through bolts, The method also comprises the step of preparing a corresponding reference camera simulation block (4) according to the real camera model to be detected and the structure that a camera bracket (6) is arranged on the inner side wall of the front bumper assembly (1); The reference camera simulation block (4) comprises a camera body (41) and an extending part (42) extending forwards; The standard camera simulation block (4) is mounted on a camera bracket (6) on the inner side of the front bumper assembly (1), and the extension part (42) penetrates through a mounting hole (11) on the front bumper assembly (1) to extend to the outside of the assembly; the front bumper assembly (1) provided with the reference camera simulation block (4) is placed on the front bumper assembly detection tool (2), and the positioning pin and the positioning hole are utilized to accurately position the front bumper assembly (1); At this time, the large reference detection block (3) is attached to the outer side of the front bumper assembly (1), the end face of the large reference detection block, which faces the extension portion (42), is a detection surface (4), the detection surface (4) and the camera (41) are arranged oppositely, and a standard gap (5) is preset between the detection surface and the camera. The detection surface (4) comprises three first reference surfaces (71), a second reference surface (72) and a third reference surface (73) which are perpendicular to each other, and is used for providing detection references of X direction, Y direction and Z direction; the extension part (42) and the detection surface (4) of the large reference detection block (3) automatically form a preset matching relationship, and the method comprises the following steps: A first gap (51) located between the left and right side surfaces of the extension (42) and the first reference surface (71), the standard preset value being 3 mm; a second gap (52) between the upper top surface of the extension (42) and the second reference surface (72), the standard preset value being 3 mm; A third matching area (53) positioned between the front end surface of the extension part (42) and the third reference surface (73), wherein the standard preset surface difference value is 0 mm; Step two, detecting actual gaps of the camera simulation block (4) and the large reference detection block (3) in the X direction and the Y direction respectively through a clearance gauge, and detecting actual face differences of the camera simulation block and the large reference detection block in the Z direction through a face difference gauge; The operator uses a clearance gauge to insert and measure the actual value of a first clearance (51) formed between the surface of the extension part (42) and a first reference surface (71) of the large reference detection block (3), and the actual value of a second clearance (52) formed between the surface of the extension part (42) and a second reference surface (72) of the large reference detection block (3), respectively, and at the same time, uses a face difference gauge to measure the actual face difference between the surface of the extension part (42) and a third reference surface (73) of the large reference detection block (3); The method comprises the steps of judging a front bumper assembly structure, comparing the measured actual value of a first gap (51) with a standard value of 3 mm, wherein the difference value is used for converting and judging deviation of a camera roll angle, comparing the actual value of a second gap (52) with the standard value of 3 mm, wherein the difference value is used for converting and judging deviation of a camera course angle, comparing the actual face difference value of a third matching area (53) with the standard value of 0 mm, wherein the difference value is used for converting and judging deviation of a camera pitch angle, and judging that the camera installation angle on the front bumper assembly (1) is qualified when the deviation of the roll angle is within +/-1.5 degrees, the deviation of the course angle is within +/-2 degrees and the deviation of the pitch angle is within +/-2 degrees.
2. The method for detecting the pre-assembled camera angle of the front bumper assembly according to claim 1, wherein the front bumper assembly detecting tool (2) comprises a base (21), a workbench (22) fixed on the base (21), and a positioning mechanism and a clamping mechanism which are arranged on the workbench (22) and used for positioning and clamping the front bumper assembly (1); wherein, the big reference detection block (3) is fixedly arranged on the workbench (22).
3. A pre-assembled camera angle detection method of a front bumper assembly according to claim 1, wherein the camera support (6) is arranged on the inner side of the front bumper assembly (1) in a fitting mode, a camera body (41) is arranged at the front end of the camera support (6), an extension part (42) extending towards the outer direction of the front bumper assembly (1) is arranged at the front end of the camera body (), the position of the extension part corresponds to the position of a mounting hole (11) in the front bumper assembly (1), the extension part (42) is arranged opposite to a large reference detection block (3), and the large reference detection block (3) provides detection references in the X direction, the Y direction and the Z direction.
4. The method for detecting the angle of the preassembled camera of the front bumper assembly according to claim 1, wherein the detecting surface (4) of the large reference detecting block (3) is arranged at the upper end of the extending part (42) in a concave arc shape, and comprises a first reference surface (71), a second reference surface (72) and a third reference surface (73) which are perpendicular to each other, and the first reference surface, the second reference surface (72) and the third reference surface are respectively matched with the vertical surface of the extending part (42) to form a detecting gap or a detecting surface difference.
5. A method of pre-assembling a camera angle detection for a front bumper assembly as set forth in claim 1, wherein said extension (42) has a regular geometric shape with an outer surface including a left or right side surface opposite said first reference surface (71) forming said first gap (51), a top surface opposite said second reference surface (72) forming said second gap (52), and a front surface opposite said third reference surface (73) forming said third mating zone (53).
6. The method for detecting the pre-installed camera angle of the front bumper assembly according to claim 1, wherein the standard preset value of the first gap (51) is 3 millimeters and is used for correspondingly detecting deviation of a camera rolling angle, the standard preset value of the second gap (52) is 3 millimeters and is used for correspondingly detecting deviation of a camera heading angle, and the standard preset surface difference value of the third matching area (53) is 0 millimeter and is used for correspondingly detecting deviation of a camera pitch angle.
7. The method for detecting the angle of the preassembled camera of the front bumper assembly according to claim 1, further comprising a clearance gauge for measuring the first clearance (51) and the second clearance (52), and a face gauge for measuring the face difference of the third fitting area (53).

Description

Front bumper assembly preassembled camera angle detection method Technical Field The invention relates to the technical field of automobile production, in particular to a pre-installation camera angle detection method for a front bumper assembly. Background Under the traditional intelligent development trend of automobiles, cameras for Advanced Driving Assistance Systems (ADAS) are generally integrated and installed on front bumper assemblies, and the accuracy of installation angles (mainly comprising course angles, pitch angles and roll angles) of the cameras directly influences the accuracy of imaging vision and follow-up algorithms of the cameras, so that the front bumper assemblies are key quality indexes for guaranteeing the safety and performance of related functions. Therefore, in the parts production and assembly process, the installation angle of the camera must be accurately detected. Currently, a mainstream detection method for a camera angle on a front bumper assembly in industry adopts a three-coordinate measuring machine. The method comprises the typical processes of firstly assembling a front bumper assembly product onto a special detection tool for fixing, then operating a measuring head of a three-coordinate measuring machine to contact specific characteristic points or surfaces on a camera shell one by one, and reversely pushing out the actual installation angle of the camera through acquisition and calculation of space point coordinates. However, the conventional three-coordinate detection method has a plurality of limitations that firstly, the internal structure of the front bumper assembly is complex, the installation position of the camera is usually narrow in space, and the three-coordinate measuring head is difficult to avoid surrounding part structures (such as a bracket, a wire harness, a bumper body and the like) to accurately reach a to-be-measured point, so that the measurement accessibility is poor, and even the measurement cannot be completed. Secondly, the measurement process is tedious and time-consuming, manual or semi-automatic measurement is required to be carried out on a plurality of points, the efficiency is low, and the requirement of carrying out quick full detection on each batch of products on a production line cannot be met. Furthermore, the three-coordinate measuring machine belongs to a high-precision precise instrument, is usually arranged in a constant temperature and humidity measuring room, needs to be operated by a professional, and leads to the detection process to be separated from a production line, so that the logistics and time cost is increased. In addition, the accuracy of the detection result is easily influenced by multiple factors such as the clamping state of the product on the detection tool, the calibration of the measuring head, the environmental vibration and the like, and the stability is required to be improved. Therefore, in the prior art, there is an urgent need for a device and a method that can adapt to the rhythm of a production line, is simple and fast to operate, is less restricted by the internal structure of a product and the detection environment, and can realize efficient, stable and visual detection of the installation angle of a camera Disclosure of Invention The invention provides a pre-assembling camera angle detection method for a front bumper assembly, which aims to solve the technical problems that three-coordinate detection cameras are complex in angle, large in detection result error and incapable of realizing rapid detection of camera angles in each batch. The technical scheme is that the front bumper assembly preassembled camera angle detection method is characterized by comprising the following steps of: step one, the gauge structure installation and reference establishment comprises a front guard assembly gauge which comprises a workbench, a large reference detection block and a large reference detection block, wherein the workbench is provided with a locating pin, a locating hole and a clamping mechanism, the large reference detection block is fixed on the workbench through bolts, The device also comprises a corresponding reference camera simulation block which is prepared according to the real camera model to be detected and the structure of the camera bracket arranged on the inner side wall of the front bumper assembly; The reference camera simulation block comprises a camera body and an extending part extending forwards; and installing the reference camera simulation block on a camera bracket on the inner side of the front bumper assembly, and enabling the extension part to penetrate through an installation hole on the front bumper assembly and extend to the outside of the assembly. The front bumper assembly provided with the reference camera simulation block is placed on the front bumper assembly detection tool, and the positioning pin and the positioning hole are utilized to accurately position the front bumper