An automotive headlight testing device and its testing method

Abstract

The present invention is applicable to the technical field of automotive headlamp testing, and provides an automotive headlamp testing device and a testing method thereof, including a housing, a testing unit, a control unit and a control system; the housing is set as a hollow cuboid, and the housing provides a testing environment for headlamp detection. The housing includes a bottom plate, a opening and closing plate rotatably connected to one side of the bottom plate, a front panel connected to one side of the bottom plate, and a top plate connected to the top of the front panel; the testing unit is arranged inside the housing, and the testing unit includes a support, four groups of support rods connected to the support, a mounting frame slidably connected to the support rods, a mounting plate connected to the top of the support rods, and an infrared detection module mounted on the bottom of the mounting plate; this device solves the problem that it is difficult to accurately locate the leakage point during the airtightness detection of automotive headlamps, and achieves the purpose of accurate positioning through color contrast and realizing accurate maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamp testing, and more specifically, it relates to an automotive vehicle lamp testing device and its testing method. Background Art

[0002] Automotive vehicle lamps are an essential part of a vehicle. They not only provide necessary lighting at night and under low visibility conditions but also ensure driving safety through various signal lights. To ensure that the electronic components and light sources inside the automotive vehicle lamps are not damaged, the automotive vehicle lamps have a certain airtightness to prevent external air, moisture, and other contaminants from entering the lamps.

[0003] Currently, the detection of automotive vehicle lamps usually includes detecting the brightness of the automotive vehicle lamps, damage or scratches on the automotive vehicle lamps, and the airtightness of the automotive vehicle lamps. The detection of the brightness of the automotive vehicle lamps and the detection of damage or scratches are usually carried out before the installation of the automotive vehicle lamp cover and the base, while the detection of the airtightness of the automotive vehicle lamps must be carried out after the automotive vehicle lamp is assembled.

[0004] Generally speaking, in the actual production process, if there is an airtightness problem with newly produced vehicle lamps, such as air leakage, the vehicle lamps need to be centrally processed or even destroyed; however, if it is an old vehicle lamp that has been used by consumers and is returned to the factory for repair, the airtightness problem of the vehicle lamp also needs to be detected. The different processing methods for the two types of vehicle lamps result in different levels of detection precision for the two types of vehicle lamps.

[0005] For old vehicle lamps with airtightness problems, including damage to the lamp cover or base or leakage at the sealing strip, usually, if the airtightness problem is caused by damage to the lamp cover or base, it can be observed by the detection personnel with the naked eye. Therefore, the detection agency needs to detect the sealing strip between the automotive vehicle lamp base and the automotive vehicle lamp. Since the old vehicle lamps with airtightness problems need to be repaired after detection, the repair of the sealing strip usually involves applying glue, so accurate positioning of the air leakage point is required for applying glue.

[0006] Moreover, it should be considered that the automotive vehicle lamp cover, sealing strip, and automotive vehicle lamp base will have a certain degree of thermal expansion and contraction. However, due to the different heat absorption capacities of the automotive vehicle lamp cover, sealing strip, and automotive vehicle lamp base, in a certain environment, although the automotive vehicle lamp does not show leakage, it cannot be avoided that airtightness leakage may occur in more extreme situations.

[0007] Therefore, it is necessary to design an automotive vehicle lamp testing device and its testing method to solve the above problems. Summary of the Invention

[0008] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an automotive vehicle lamp testing device and its testing method.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An automobile headlight testing device, comprising a housing, a testing unit, a control unit and a control system;

[0011] The housing is set as a hollow cuboid, and the housing provides a testing environment for headlight detection. The housing includes a bottom plate, a hinged plate rotatably connected to one side of the bottom plate, a front panel connected to one side of the bottom plate, and a top plate connected to the top of the front panel;

[0012] The testing unit is arranged inside the housing. The testing unit is used to place the headlight to be detected, and the airtightness of the headlight is detected by using an infrared thermal imaging detection method;

[0013] The testing unit includes a support, four groups of support rods connected to the support, a mounting rack slidably connected to the support rods, a mounting plate connected to the top of the support rods, and an infrared detection module mounted on the bottom of the mounting plate;

[0014] The control unit is used to control the state of the control system, switch the mode of the control system, and represent the control information of the control system; the control unit includes an air injection valve for injecting detection gas into the headlight;

[0015] The control system is electrically connected to the housing, the testing unit and the control unit. The control system receives the control signal transmitted by the control unit and performs corresponding mode and state switching.

[0016] The present invention is further set as follows: The testing unit includes a support mounted on the top of the bottom plate. The support is symmetrically provided with holes. The four groups of support rods are distributed along the four corners of the support. The mounting plate is set as a rectangular structure and is adapted to the shape of the support rods.

[0017] The present invention is further set as follows: The mounting rack includes two groups of limiting racks slidably connected to the support rods. The two groups of limiting racks are symmetrically arranged facing each other. The bottom of each limiting rack is connected with a limiting cylinder. The limiting cylinder passes through the hole of the support and is connected to the side wall of the limiting rack.

[0018] The present invention is further set as follows: Two groups of support cylinders are connected to the top of the support. The two groups of support cylinders are connected with a support frame at the top. The support frame is set as a hollow structure. The support frame is used to place the automobile headlight.

[0019] The present invention is further set as follows: The control unit is arranged on the front panel. The control unit includes a control panel arranged on the front panel. A mode switching button is arranged at the bottom of the control panel. A timing knob is installed on one side of the mode switching button. An air injection valve is installed on the side of the mode switching button away from the timing knob. One end of the air injection valve close to the testing unit is connected with an air injection hole;

[0020] The air injection hole is connected with a rubber hose for injecting air into the interior of the automobile headlamp.

[0021] The control panel is used for inputting test parameters required for the test.

[0022] The present invention is further configured that: the control system includes a mode control unit, a parameter control unit, a test unit, and a characterization unit;

[0023] The mode control unit of the control unit is used for mode switching and adopts different detection methods according to whether the headlamp is a new headlamp or an old headlamp.

[0024] The parameter control unit includes an environment control unit and a pressure control unit. The parameter control unit receives test parameters. The environment control unit controls the temperature inside the housing according to the test parameters and transmits the temperature information inside the housing to the characterization unit for detecting whether gas leakage occurs in the headlamp under different temperature states. The pressure control unit is electrically connected to the air injection hole, and the pressure control unit controls the gas volume injected into the automobile headlamp through the air injection hole according to the test parameters.

[0025] The test unit receives the temperature distribution image transmitted by the infrared detection module, divides the temperature distribution image into regions to obtain a temperature grid map and a temperature distribution table, and transmits the temperature grid map and the temperature distribution table.

[0026] The characterization unit is used for characterizing the temperature grid map and the temperature distribution table transmitted by the test unit and the temperature transmitted by the environment control unit, and characterizing the temperature grid map and the temperature distribution table on the liquid crystal screen of the control panel.

[0027] The present invention is further configured that: the test unit divides the temperature distribution image through grid division, collects and separates the grids containing the automobile headlamp and those not containing the automobile headlamp; and conducts color comparison on the temperature distribution image.

[0028] Among them, according to the precision requirements of the automobile headlamp detection, the grid density of the automobile headlamp is selected.

[0029] The present invention is further configured that: the parameter control unit is electrically connected to the control unit, and the parameter control unit receives the test parameters transmitted by the control unit.

[0030] Among them, the test parameters include environmental temperature and pressure value.

[0031] An automobile headlamp test method, according to the above-mentioned automobile headlamp test equipment, includes the following steps:

[0032] S1. The operator opens the opening and closing plate, moves the mounting rack downward, and places the automotive headlight to be tested on the mounting rack.

[0033] S2. Perform mode switching according to whether the automotive headlight is a new one or an old one; if it is a new headlight, execute S3, and if it is an old headlight, execute S4.

[0034] S3. Conduct new headlight detection.

[0035] S31. Inject gas into the automotive headlight through the gas injection valve, let it stand for 5 - 10 minutes, start the infrared detection module, and obtain the temperature distribution image.

[0036] If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak.

[0037] If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak.

[0038] S4. Conduct old headlight detection.

[0039] S41. Inject gas into the automotive headlight through the gas injection valve, let it stand for 5 - 10 minutes, start the infrared detection module, and obtain the temperature distribution image.

[0040] If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak.

[0041] If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak; perform positioning processing.

[0042] The present invention is further configured such that the positioning processing in S41 includes the following steps:

[0043] S411. Conduct grid division based on the temperature distribution image obtained by the infrared detection module; determine the grid division degree according to different precisions.

[0044] S412. Collect and separate the grid map of the automotive headlight and the grid map of the environmental area in the temperature distribution image.

[0045] S413. Further separate the grid map containing the boundary of the automotive headlight and the grid map without the boundary of the automotive headlight from the separated grid map of the automotive headlight.

[0046] S414. Randomly select a grid in the grid map without the boundary of the automotive headlight as the reference color, compare each grid map containing the boundary of the automotive headlight with the reference color, and compare each grid map containing the boundary of the automotive headlight with itself.

[0047] In summary, the present application includes at least one of the following beneficial technical effects:

[0048] 1. The present invention provides a stable test environment through a hollow cuboid-shaped housing to ensure consistent internal temperature and avoid test errors caused by inconsistent external temperatures. The test unit adopts an infrared thermal imaging detection method to accurately detect the airtightness of the vehicle lamp. The control unit is responsible for the mode switching and status management of the control system, and receives control signals through the control system to achieve accurate mode and status switching. The overall design ensures the accuracy and reliability of the test results, and improves the efficiency and precision of the airtightness detection of the vehicle lamp; moreover, the test unit can perform grid division and analysis on the temperature distribution map detected by the infrared detection module, conduct color comparison through grid division and analysis, and achieve precise positioning of the leakage point through color comparison.

[0049] 2. The present invention adjusts according to the height of the vehicle lamp by setting two groups of limit frames. Since, for clear detection, the support frame needs to be as close as possible to the infrared detection module, and at the same time, it is necessary to ensure that the vehicle lamp can be completely irradiated by the infrared detection module. During this movement process, it may cause damage to the infrared detection module by a connector or other protruding block at a certain part of the vehicle lamp during the movement. Therefore, the two groups of limit frames cooperate with the support frame to move, always staying at the highest point of the vehicle lamp to ensure that the highest part of the vehicle lamp does not cause damage to the infrared detection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic structural diagram of a vehicle lamp test device of the present invention.

[0051] Figure 2 is Figure 1 an exploded schematic diagram of

[0052] Figure 3 is a schematic structural diagram of the test unit in the present invention.

[0053] Figure 4 is a schematic structural diagram of the mounting bracket in the present invention.

[0054] Figure 5 is Figure 1 a front view of

[0055] Figure 6 is a schematic structural diagram of the air injection valve in the present invention.

[0056] Description of the reference numerals: 1. Housing; 11. Bottom plate; 12. Top plate; 13. Opening and closing plate; 14. Front panel;

[0057] 2. Test unit; 21. Support; 22. Support rod; 23. Mounting bracket; 231. Support frame; 232. Support cylinder; 233. Limit frame; 234. Limit cylinder; 24. Mounting plate; 25. Infrared detection module;

[0058] 3. Control unit; 31. Control panel; 32. Gas injection valve; 33. Gas injection hole; 34. Timing knob; 35. Mode switching button. Detailed implementation manners

[0059] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0060] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0061] Please refer to Figures 1 - 6 , the present invention provides the following technical solutions:

[0062] Embodiment 1, please refer to Figures 1 - 6 , an automobile headlamp testing device, including a housing 1, a testing unit 2, a control unit 3 and a control system; the housing 1 is set as a hollow cuboid, and the housing 1 provides a testing environment for headlamp detection, ensuring that the environmental area temperature inside the housing 1 is consistent and there is no test result error caused by inconsistent external temperatures; the testing unit 2 is arranged inside the housing 1, and the testing unit 2 is used to place the headlamp to be detected, and the airtightness of the headlamp is detected by using an infrared thermal imaging detection method; the control unit 3 is used to control the state of the control system, switch the mode of the control system and represent the control information of the control system; the control system is electrically connected to the housing 1, the testing unit 2 and the control unit 3, and the control system receives the control signal transmitted by the control unit 3 and performs corresponding mode and state switching.

[0063] The housing 1 includes a bottom plate 11, one side of the bottom plate 11 is rotatably connected with an opening and closing plate 13, the opening and closing plate 13 is hinged to the bottom plate through a hinge, and the hinge has a light damping so that the opening and closing plate 13 can stand upright stably in the vertical direction. One side of the bottom plate 11 is also connected with a front panel 14, the front panel 14 provides an installation environment for the control unit 3, and the top of the bottom plate 11 is connected with a top plate 12.

[0064] The testing unit 2 includes a support 21, four groups of support rods 22 are installed on the top of the support 21, holes are symmetrically opened on the support 21, the four groups of support rods 22 are distributed along the four corners of the support 21, an installation frame is slidably connected to the four groups of support rods 22, the tops of the four groups of support rods 22 are connected with an installation plate 24, the installation plate 24 is set as a rectangular structure and is adapted to the shape of the support rods 22, and an infrared detection module 25 is installed at the bottom of the installation plate 24.

[0065] The mounting bracket 23 includes two groups of limiting brackets 233 slidably connected to the support rod 22. The two groups of limiting brackets 233 are symmetrically arranged facing each other. A limiting air cylinder 234 is connected to the bottom of each group of limiting brackets 233. The limiting air cylinder 234 passes through the hole in the support 21 and is connected to the side wall of the limiting bracket 233. Two support air cylinders 232 are connected to the top of the support 21. The tops of the two support air cylinders 232 are connected to a support frame 231. The support frame 231 is provided with a hollow structure and is used to place the automotive headlight.

[0066] Specifically, the two groups of limiting brackets 233 in this embodiment are adjusted according to the height of the automotive headlight. In order to ensure accurate detection, the support frame 231 needs to be as close as possible to the infrared detection module 25. At the same time, it is necessary to ensure that the automotive headlight can be completely irradiated by the infrared detection module 25. During this movement process, it may cause damage to the infrared detection module 25 by a connector or other protruding block at a certain part of the headlight during the movement. Therefore, the two groups of limiting brackets 233 cooperate with the support frame 231 to move, always staying at the highest point of the automotive headlight to ensure that the highest part of the automotive headlight does not cause damage to the infrared detection module 25.

[0067] Refer to Figure 5 , the control unit 3 is arranged on the front panel 14. The control unit 3 includes a control panel 31 arranged on the front panel 14. The control panel 31 is used to control the control system, including controlling parameters such as the environmental temperature of the test. A mode switching button 35 is arranged at the bottom of the control panel 31, which facilitates the rapid switching of modes. A timing knob 34 is installed on one side of the mode switching button 35, and the timing knob 34 can adjust the temperature. An air injection valve 32 is installed on the side of the mode switching button 35 away from the timing knob 34. One end of the air injection valve 32 close to the test unit 2 is connected to an air injection hole 33; the air injection hole 33 is connected to a rubber hose for injecting gas into the automotive headlight.

[0068] Specifically, when the automotive headlight needs to be tested, the operator controls the mode switching button 35 according to whether the automotive headlight to be tested is a new headlight or an old headlight. The operator places the automotive headlight on the support frame 231. The support frame 231 adjusts its position through the support air cylinders 232, and the limiting brackets 233 make corresponding adjustments according to the height of the headlight, ensuring that the automotive headlight can be completely irradiated by the infrared detection module 25 without damaging the infrared detection module 25; the operator inputs the test parameters into the control unit 3 and rotates the timing knob 34 for timing. After the test parameters are input, the operator closes the opening and closing plate 13. When the opening and closing plate 13 is closed, the air injection valve 32 is activated. According to the test parameters, the air injection hole 33 injects gas into the air injection port of the automotive headlight through the rubber hose and stands still according to the set time of the timing knob 34. After the standing still ends, the infrared detection module 25 is activated to irradiate the automotive headlight, and the irradiation result is transmitted to the test unit for analysis to obtain whether the headlight is airtight.

[0069] Embodiment 2. Please refer to Figure 1 — Figure 6 , based on Embodiment 1, the following improvements are made in this Embodiment 2. Although the airtightness detection of automobile headlights can be completed through Embodiment 1, in actual detection, the automobile headlights to be detected include new headlights and old headlights. If there are airtightness problems with the two types of headlights, the means to be taken are different. Therefore, it is necessary to perform detection in different modes. And correspondingly, when there is an airtightness problem with the old headlights, maintenance usually needs to be considered, and precise positioning of the air leakage point is required for maintenance. Therefore, different modes corresponding to different headlights need to be set to solve the above problems.

[0070] In this embodiment, the control system includes a mode control unit, a parameter control unit, a test unit, and a characterization unit.

[0071] The mode control unit is used for mode switching. According to whether the headlight is a new headlight or an old headlight, different detection methods are adopted.

[0072] The parameter control unit includes an environment control unit and a pressure control unit. The parameter control unit receives test parameters. The environment control unit controls the temperature inside the housing 1 according to the test parameters and transmits the temperature information inside the housing 1 to the characterization unit, which is used to detect whether gas leakage occurs in the headlight under different temperature conditions; the pressure control unit is electrically connected to the air injection hole 33, and the pressure control unit controls the gas volume injected into the automobile headlight through the air injection hole 33 according to the test parameters.

[0073] The parameter control unit is electrically connected to the control unit 3, and the parameter control unit receives the test parameters transmitted by the control unit 3;

[0074] Among them, the test parameters include ambient temperature and pressure value.

[0075] The change in ambient temperature is added during the test because the usage conditions of automobile headlights are strict and need to adapt to most of the temperatures in the natural environment. It should be considered that there will be a certain degree of thermal expansion and contraction in the automobile headlight lamp cover, sealing strip, and automobile headlight base. However, due to the different heat absorption capabilities of the automobile headlight lamp cover, sealing strip, and automobile headlight base, in a certain environment, the automobile headlight does not show leakage, but it cannot be avoided that there is no airtightness leakage in more extreme situations. Therefore, it is necessary to measure the airtightness of the same automobile headlight at different ambient temperatures.

[0076] The test unit receives the temperature distribution image transmitted by the infrared detection module 25, divides the temperature distribution image into regions to obtain a temperature grid map and a temperature distribution table, and transmits the temperature grid map and the temperature distribution table.

[0077] Characterization unit, which is used to characterize the temperature grid map and temperature distribution table transmitted by the test unit and the temperature transmitted by the environmental control unit, and characterize the temperature grid map and temperature distribution table on the liquid crystal screen of the control panel 31. The characterization unit improves the visibility and interactivity of the test equipment, visually displays the detection results on the liquid crystal screen of the control panel 31, enables the inspectors to visually observe where air leakage occurs in the automotive headlight, and facilitates the next maintenance operation.

[0078] The test unit divides the temperature distribution image through grid division, and collects and separates the grids containing the automotive headlight and those not containing the automotive headlight; among them, according to the precision requirements of automotive headlight detection, different selections can be made for the grid density of the automotive headlight, and various types of selections such as equal can be made; the detected temperature of the image not containing the automotive headlight is the ambient temperature in the housing 1, and its ambient temperature is set artificially, so its temperature is meaningless; the detected temperature of the image containing the automotive headlight is the temperature of the automotive headlight, but the center temperature of the automotive headlight usually does not change and it is difficult to evaluate the airtightness through the center temperature of the automotive headlight, so it can be used as a reference temperature for comparison.

[0079] Due to the characteristics of the computer, when comparing temperatures, after the grid division is completed, there are still pictures with multiple groups of pixel points. Therefore, in order to achieve precise comparison, it is necessary to collect the color values of multiple random points or center points in each grid for comparison; since the reference temperature value is the center temperature of the automotive headlight, there will be no temperature fluctuations. Therefore, only the center point color needs to be selected in the automotive headlight grid. This temperature is implemented through the Pillow library in Python. The specific steps are as follows:

[0080] A1. Open the temperature distribution image: Use Image.open to open the temperature distribution image file.

[0081] A2. Obtain the size of the temperature distribution image: Use image.size to obtain the width and height of the temperature distribution image.

[0082] A3. Calculate the center point coordinates: Calculate the center point coordinates of the temperature distribution image through the integer division operator.

[0083] A4. Obtain the center point color: Use the image.getpixel method to obtain the color value of the center point.

[0084] However, there are certain problems in taking the temperature values of the grid points including the boundary of the car headlight. If there is only a slight leakage at the boundary of the car headlight, when selecting multiple groups of random points in the grid, there will be a situation where the temperature near the slight leakage point is not collected. If this situation occurs, it will cause the detection of the slight leakage point to fail. Therefore, there are different ways to take the grid temperature including the car headlight border inspection. Although it is also implemented using the Pillow library in Python, the specific steps are as follows:

[0085] B1. Open the temperature distribution image: Use Image.open to open the temperature distribution image file.

[0086] B2. Convert to RGB mode: Use image.convert('RGB') to convert the temperature distribution image to RGB mode to ensure that all color values are triples (R, G, B).

[0087] B3. Get the size of the temperature distribution image: Use image.size to get the width and height of the temperature distribution image.

[0088] B4. Create a color count dictionary: Use defaultdict(int) to create a dictionary to store the occurrence times of each color.

[0089] B5. Traverse the pixels of the temperature distribution image: Use nested loops to traverse each pixel of the temperature distribution image, and use image.getpixel to get the color of the pixel.

[0090] B6. Increase the color count: Add the color of each pixel to the dictionary and increase its count.

[0091] B7. Find the most and least occurring colors: Use the max and min functions to find the colors with the most and least occurrences respectively; it should be noted that the max and min functions are built-in functions in Python, used to find the maximum and minimum values in iterable objects (such as lists, tuples, sets, etc.).

[0092] It should be further noted that if there is no leakage in the grid here including the boundary of the car headlight, there will be no color change. Therefore, if there is only one color in the picture, the max and min functions will return the same color because the colors of all pixels are the same. Therefore, the output will be the same color value. If this color value is the same as the reference temperature, it means that there is no leakage at this grid; but if this color value is different from the reference temperature color, it means that there is a leakage at this grid, and due to the leakage, the entire grid position is at an abnormal temperature.

[0093] If the grid containing the boundary of the car headlight leaks, there will be different colors in the picture. Then, the max and min functions will return different colors. At this time, it indicates that a leak must have occurred. At this time, there is no need to compare the different colors returned by the max and min functions with the reference temperature color. It seems that all grids can adopt the format of self-comparison, and the step of using the reference temperature color in this embodiment is redundant. However, in fact, during the actual detection process, there may be a phenomenon where, due to inappropriate selection of grid points or the leakage point being too large or too small, although the temperature inside the grid points is the same, a leak has actually occurred. Therefore, both self-comparison and comparison with the reference temperature color should be carried out to ensure the accuracy of the test results.

[0094] The present invention provides a stable test environment through the hollow cuboid-shaped housing 1 to ensure consistent internal temperature and avoid test errors caused by inconsistent external temperatures. The test unit 2 uses an infrared thermal imaging detection method to accurately detect the airtightness of the headlight. The control unit 3 is responsible for the mode switching and status management of the control system, and receives control signals through the control system to achieve accurate mode and status switching. The overall design ensures the accuracy and reliability of the test results, improving the efficiency and accuracy of the airtightness detection of the headlight; moreover, the test unit 2 can perform grid division and analysis on the temperature distribution map detected by the infrared detection module 25, conduct color comparison through grid division and analysis, and achieve precise positioning of the leakage point through color comparison.

[0095] Embodiment 3 makes the following improvements based on Embodiment 1 and Embodiment 2. Although the airtightness detection of the car headlight and temperature color comparison can be completed through Embodiment 1 and Embodiment 2, it should be further noted that when it is necessary to perform as little glue filling as possible (this situation is usually applied to special vehicles or special requirements of car headlight users), more precise positioning is required. In this case, the comparison situation in Embodiment 2 needs to be replaced to perform more precise leakage point positioning.

[0096] Specifically, the methods of obtaining the temperature at the center point of the car headlight and obtaining the least and most colors of the grid colors at the boundary of the car headlight remain unchanged. However, after using the max and min functions to find the most and least frequently occurring colors respectively, further processing is required.

[0097] In Embodiment 2, after the max and min functions return different colors, it is directly determined that a leak has occurred at that grid point. However, this method does not perform precise positioning, only locating to that grid. If more precise positioning is required, the positioning method is: divide this grid into multiple groups of grids again, and each group of grids is compared with the reference grid point temperature again as in Embodiment 2. It should be noted that at this time, the color of the reference temperature does not change, but only further precise positioning is performed to locate to a more precise grid point.

[0098] Example 4. A method for testing an automotive headlight, according to an automotive headlight testing device, includes the following steps:

[0099] S1. The operator opens the opening and closing plate 13, the mounting bracket 23 moves downward, and places the automotive headlight to be tested on the mounting bracket 23;

[0100] S2. Perform mode switching according to whether the automotive headlight is a new headlight or an old headlight; if it is a new headlight, execute S3, if it is an old headlight, execute S4;

[0101] S3. Conduct new headlight detection;

[0102] S31. Inject gas into the automotive headlight through the gas injection valve 32, let it stand for minutes, start the infrared detection module 25, and obtain a temperature distribution image;

[0103] If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak;

[0104] If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak;

[0105] S4. Conduct old headlight detection;

[0106] S41. Inject gas into the automotive headlight through the gas injection valve 32, let it stand for minutes, start the infrared detection module 25, and obtain a temperature distribution image;

[0107] If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak;

[0108] If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak; perform positioning processing.

[0109] In this embodiment, specifically: The positioning processing in S41 includes the following steps:

[0110] S411. Perform grid division according to the temperature distribution image obtained by the infrared detection module 25; determine the grid division degree according to different precisions;

[0111] S412. Collect and separate the grid map of the automotive headlight and the grid map of the environmental area in the temperature distribution image;

[0112] S413. Further separate the grid map containing the boundary of the automotive headlight and the grid map without the boundary of the automotive headlight from the separated grid map of the automotive headlight;

[0113] S414. Randomly select a grid in the grid map without the boundary of the automotive headlight as the reference color, compare each grid map containing the boundary of the automotive headlight with the reference color, and compare each grid map containing the boundary of the automotive headlight with itself.

[0114] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. An automobile headlamp testing method, characterized in that, It includes the following steps: S1. The operator opens the opening and closing plate (13), the mounting frame (23) moves downward, and the automotive headlight to be tested is placed on the mounting frame (23). S2. Perform mode switching according to whether the automotive headlight is a new headlight or an old headlight; if it is a new headlight, execute S3, if it is an old headlight, execute S4; when performing mode switching, the corresponding button is pressed by the staff member. S3. Conduct new headlight detection. S31. Inject gas into the automotive headlight through the gas injection valve (32), let it stand for 5 - 10 minutes, start the infrared detection module (25), and obtain the temperature distribution image. If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak. If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak. S4. Conduct old headlight detection. S41. Inject gas into the automotive headlight through the gas injection valve (32), let it stand for 5 - 10 minutes, start the infrared detection module (25), and obtain the temperature distribution image. If the temperatures near the edge of the headlight are consistent, it indicates that the headlight has no leak. If the temperatures near the edge of the headlight are inconsistent, it indicates that the headlight has a leak; perform positioning processing. The positioning processing in S41 includes the following steps: S411. Conduct grid division according to the temperature distribution image obtained by the infrared detection module (25); determine the grid division degree according to different precisions. S412. Collect and separate the grid map of the automotive headlight and the grid map of the environmental area in the temperature distribution image. S413. Further separate the grid map containing the boundary of the automotive headlight and the grid map without the boundary of the automotive headlight from the separated grid map of the automotive headlight. S414. Randomly select a grid in the grid map without the boundary of the automotive headlight as the reference color, compare each grid map containing the boundary of the automotive headlight with the reference color, and compare each grid map containing the boundary of the automotive headlight with itself.

2. An automotive headlight testing device that uses the automotive headlight testing method as described in claim 1, characterized in that: It includes a housing (1), a test unit (2), a control unit (3), and a control system. The housing (1) is set as a hollow cuboid shape, the housing (1) provides a test environment for headlight detection, and the housing (1) includes a bottom plate (11), an opening and closing plate (13) rotatably connected to one side of the bottom plate (11), a front panel (14) connected to one side of the bottom plate (11), and a top plate (12) connected to the top of the front panel (14). The test unit (2) is arranged inside the housing (1), the test unit (2) is used to place the headlight to be detected, and the airtightness of the headlight is detected by using the infrared thermal imaging detection method. The test unit (2) includes a support (21), four groups of support rods (22) connected to the support (21), a mounting frame (23) slidably connected to the support rods (22), a mounting plate (24) connected to the top of the support rods (22), and an infrared detection module (25) mounted on the bottom of the mounting plate (24). The control unit (3) is used to control the state of the control system, switch the mode of the control system, and represent the control information of the control system; the control unit (3) includes a gas injection valve (32) for injecting detection gas into the headlight. The control system is electrically connected to the housing (1), the test unit (2), and the control unit (3). The control system receives the control signal transmitted by the control unit (3) and performs corresponding mode and state switching. The control system includes a mode control unit, a parameter control unit, a test unit, and a characterization unit. The test unit receives the temperature distribution image transmitted by the infrared detection module (25), divides the temperature distribution image into regions, obtains a temperature grid map and a temperature distribution table, and transmits the temperature grid map and the temperature distribution table. The test unit collects and separates the grids containing and not containing automotive headlights, and performs color comparison on the temperature distribution image. Among them, according to the precision requirements of automotive headlight detection, the grid density of automotive headlights is selected.

3. An automotive headlight testing device according to claim 2, characterized in that: The test unit (2) includes a support (21) installed on the top of the bottom plate (11). The support (21) is symmetrically provided with holes. Four groups of the support rods (22) are distributed along the four corners of the support (21). The mounting plate (24) is set as a rectangular structure and is adapted to the shape of the support rods (22).

4. The automotive headlight testing device according to claim 3, characterized in that: The mounting frame (23) includes two sets of limit frames (233) slidably connected to the support rods (22). The two sets of limit frames (233) are symmetrically arranged facing each other. The bottom of each set of limit frames (233) is connected to a limit cylinder (234). The limit cylinder (234) passes through the hole of the support (21) and is connected to the side wall of the limit frame (233).

5. The automotive headlight testing device according to claim 4, characterized in that: Two sets of support cylinders (232) are connected to the top of the support (21). Two sets of support cylinders (232) are connected to a support frame (231) at the top. The support frame (231) is set as a hollow structure. The support frame (231) is used to place the automotive headlight.

6. The automotive headlight testing device according to claim 5, characterized in that: The control unit (3) is arranged on the front panel (14). The control unit (3) includes a control panel (31) arranged on the front panel (14). A mode switching button (35) is arranged at the bottom of the control panel (31). A timing knob (34) is installed on one side of the mode switching button (35). An air injection valve (32) is installed on the side of the mode switching button (35) away from the timing knob (34). One end of the air injection valve (32) close to the test unit (2) is connected to an air injection hole (33). The air injection hole (33) is connected with a rubber hose for injecting air into the automotive headlight. The control panel (31) is used to input the test parameters required for the test.

7. An automotive headlight testing device according to claim 6, characterized in that: The mode control unit is used for mode switching and adopts different detection methods according to whether the headlight is a new headlight or an old headlight. The parameter control unit includes an environment control unit and a pressure control unit. The parameter control unit receives the test parameters. The environment control unit controls the temperature inside the housing (1) according to the test parameters and transmits the temperature information inside the housing (1) to the characterization unit for detecting whether gas leakage occurs in the headlight under different temperature states. The pressure control unit is electrically connected to the air injection hole (33). The pressure control unit controls the amount of gas injected into the automotive headlight through the air injection hole (33) according to the test parameters. The characterization unit is used to characterize the temperature grid map and temperature distribution table transmitted by the test unit and the temperature transmitted by the environmental control unit, and characterize the temperature grid map and temperature distribution table on the liquid crystal screen of the control panel (31).

8. An automotive headlight testing device according to claim 7, characterized in that: The parameter control unit is electrically connected to the control unit (3), and the parameter control unit receives the test parameters transmitted by the control unit (3); Among them, the test parameters include environmental temperature and pressure value.

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