Automotive Lighting Fogging Test Method and System

Abstract

This invention discloses a method and system for testing fogging in automotive lighting fixtures. The testing method includes: placing a lighting fixture sample in a fogging test chamber, turning on the light and placing it there continuously for a first preset time, wherein the temperature of the fogging test chamber is set to a preset test temperature and the relative humidity is set to a preset test humidity; turning off the light, and spraying the sample with water after the temperature of the left side of the lighting fixture sample has dropped to room temperature, wherein the left side refers to the lamp surface side of the lighting fixture sample. This invention simulates the environment in which fog is generated by designing the temperature and humidity of the fogging test chamber and the spraying process, moving the test scenario from a real vehicle to a laboratory, while simplifying the test procedure and allowing the test to be completed using common testing equipment, thus increasing the operability of the test.

Description

Technical Field

[0001] This invention relates to the field of lamp fogging testing technology, and in particular to a method and system for testing automotive lamp fogging. Background Technology

[0002] As a crucial component of automobiles, automotive lights play a vital role in ensuring driving safety and providing effective illumination. In driving environments with large temperature differences between day and night or high humidity, fogging of automotive lights reduces their brightness and clarity. This not only diminishes the driver's visibility at night or in inclement weather but also reduces the efficiency with which other road users can perceive the vehicle's lights. Fogging issues can be mitigated through both design and quality control. For example, during the design phase, the probability of fogging can be reduced by increasing or decreasing the number of venting membranes and caps, or by optimizing their placement. Fogging caused by external factors or manufacturing defects can be eliminated during quality control. Both design and quality control improvements to address fogging require automotive light fogging tests for verification.

[0003] Existing methods for testing automotive lighting fog often require zoned control of the lamp sample, setting different test temperatures and relative humidity for different areas of the sample, necessitating the use of specialized test chambers. Furthermore, the steps for simulating the fog-generating environment in existing automotive lighting fog testing methods are quite complex. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the purpose of this invention is to provide a method and system for testing fogging in automotive lamps.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention provides a method for testing fogging in automotive lighting, comprising:

[0007] The lamp sample is placed in a fog test chamber, lit, and left for a first preset time. The temperature of the fog test chamber is set to a preset test temperature, and the relative humidity is set to a preset test humidity.

[0008] Turn off the lights and wait for the temperature of the left area of ​​the lamp sample to drop to room temperature before spraying. The left area refers to one side of the lamp surface of the lamp sample.

[0009] Furthermore, before the step of placing the lamp sample in the fog test chamber, turning on the lamp, and continuously placing it for a first preset time, the method further includes:

[0010] The lamp sample was pretreated in a standard temperature and humidity chamber.

[0011] Adjust the temperature of the standard temperature and humidity chamber to the preset drying temperature, place the turned-on lamp sample in the standard temperature and humidity chamber and leave it there for a second preset time.

[0012] The lamp sample was taken out and installed, and the temperature of the standard temperature and humidity chamber was adjusted to the preset static temperature and the relative humidity was adjusted to the preset static relative humidity. The preset static temperature and the preset static relative humidity are used to simulate a humid environment and keep the temperature and relative humidity of the lamp sample consistent.

[0013] The installed lamp sample is placed in the standard temperature and humidity chamber and left there for a third preset time.

[0014] Furthermore, the preset drying temperature is 60°C, and the second preset time is 4 hours;

[0015] The preset resting temperature is 20℃, the preset resting relative humidity is 90%RH, and the third preset time is 16h.

[0016] Furthermore, the preset test temperature is 50°C, the preset test humidity is 60%RH, and the first preset time is 1.5h.

[0017] Furthermore, the step of spraying after the temperature of the left zone of the lamp sample has dropped to room temperature includes:

[0018] After the temperature of the left zone drops to room temperature, water at a preset spray temperature is sprayed and this continues for a fourth preset time.

[0019] Furthermore, the room temperature is 25℃±3℃, the preset spray temperature is 10℃±2℃, and the fourth preset time is 1min.

[0020] Furthermore, after the step of spraying the lamp sample after the temperature of the left area has dropped to room temperature, the method further includes:

[0021] Record the fogging and fog dissipation of the lamp samples after spraying:

[0022] Record the fogging status of the lamp sample within the fifth preset time period;

[0023] Record the fog dissipation of the lamp sample within the sixth preset time period.

[0024] Furthermore, the fifth preset time is 15 minutes, and the sixth preset time is 1 hour.

[0025] The present invention also provides an automotive lighting fogging test system, including a standard temperature and humidity chamber, a fogging test chamber, an external power supply, and a camera device;

[0026] The standard temperature and humidity chamber is used for pretreatment of lamp samples;

[0027] The fog test chamber is used to simulate the environment in which fog is generated.

[0028] The external power source is used to power the lamp sample;

[0029] The camera device is used to record the fog formation and the fog dissipation.

[0030] The fog test chamber is equipped with a channel for connecting the external power supply and the lamp sample.

[0031] Furthermore, the mist test chamber is equipped with a spraying mechanism, which includes a spraying hose and a temperature control system. The temperature control system is used to control the water flow temperature of the spraying hose.

[0032] The beneficial effects of this invention are:

[0033] The present invention relates to a method and system for testing fogging of automotive lamps. The testing method includes: placing a lamp sample in a fogging test chamber, turning on the lamp and placing it therefore for a first preset time, wherein the temperature of the fogging test chamber is set to a preset test temperature and the relative humidity is set to a preset test humidity; turning off the lamp, and spraying the sample after the temperature of the left area of ​​the lamp sample drops to room temperature, wherein the left area refers to one side of the lamp surface of the lamp sample.

[0034] This invention simulates the environment in which fog is generated by designing the temperature, humidity, and spray of a fog test chamber. It moves the test scenario from a real vehicle to a laboratory, simplifies the test process, and allows the test to be completed using common test equipment, thus increasing the operability of the test.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0037] Figure 1 This is a flowchart of the automotive lighting fogging test method of the present invention;

[0038] Figure 2 This is a schematic diagram of the automotive lighting fogging test system of the present invention. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Those skilled in the art will understand that, unless otherwise stated, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0042] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as in the embodiments of this application.

[0043] This embodiment provides a method and system for testing fogging in automotive lighting fixtures, applicable to fogging tests in automotive lighting fixtures.

[0044] In this embodiment, the lamp sample includes automotive headlights and automotive taillights. The lamp sample is usually a light-emitting and self-sealing integrated part with a hollow interior. The lamp body structure is placed inside the lamp sample, and there is a certain space to accommodate air.

[0045] Fogging in automotive headlights typically occurs inside the headlight housing or on the inner surface of the lens, while fogging in automotive taillights usually occurs inside the taillight housing. This is because when there is a large temperature difference or humidity, water vapor in the air condenses upon contact with the cold air and adheres to the inner surface of the lens. The automotive lighting fogging test method in this embodiment simulates a fogging environment and observes the fogging and fog dissipation of the lighting sample under such conditions.

[0046] The flowchart of the automotive lighting fogging test method provided in this embodiment is as follows: Figure 1 As shown, it includes steps S10-S30.

[0047] S10. Place the lamp sample in a standard temperature and humidity chamber for pretreatment.

[0048] In this embodiment, a visual inspection of the lamp sample is required before the preprocessing step. The visual inspection checks for any defects in the lamp sample. For example, if spots, cracks, or deformation are present on the surface of the lamp sample, it is determined that the lamp sample has a visual defect. Similarly, if dust spots, bubbles, or even missing aluminum plating or paint are present on the reflector or decorative ring, it is determined that the lamp sample has a visual defect. It is understood that if the testing personnel discover visual defects in the lamp sample during the visual inspection, the visual inspection is deemed unqualified, and the lamp sample must be replaced.

[0049] In this embodiment, after the appearance inspection is passed, the lamp sample is pre-processed. Step S10 includes S101-S102.

[0050] S101. Adjust the temperature of the standard temperature and humidity chamber to the preset drying temperature, place the turned-on lamp sample in the standard temperature and humidity chamber and leave it for a second preset time.

[0051] Furthermore, in this embodiment, the preset drying temperature is 60°C and the second preset time is 4 hours.

[0052] It should be noted that in this embodiment, step S101 is completed using the drying function of a standard temperature and humidity chamber; therefore, it is not necessary to set the relative humidity. The preset drying temperature is set by relevant technical personnel.

[0053] Typically, automotive headlights include low beam headlights, high beam headlights, side marker lights, fog lights, and turn signals. Automotive taillights include reversing lights, side marker lights, brake lights, turn signals, and fog lights. Automotive lamps have many internal lamp body structures and usually have self-sealing characteristics. Therefore, to avoid insufficient drying of the interior of the automotive headlights or taillights, in this embodiment, the lamp sample is opened for drying. Opening the automotive headlights refers to opening the rear cover of the headlights, and opening the automotive taillights refers to opening the rear cover of the taillights.

[0054] Furthermore, in this embodiment, after the lamp sample is completely dried, it needs to be installed and left to stand for a period of time. Specifically:

[0055] S102. Take out and install the lamp sample, adjust the temperature of the standard temperature and humidity chamber to the preset static temperature, adjust the relative humidity to the preset static relative humidity, place the installed lamp sample in the standard temperature and humidity chamber and keep it there for a third preset time.

[0056] Furthermore, in this embodiment, the preset resting temperature is 20°C, the preset resting relative humidity is 90%RH, and the third preset time is 16h.

[0057] It should be noted that step S102 simulates a vehicle in a humid environment. By observing the entry of water vapor into the lamp sample and the fogging, the self-sealing performance of the lamp sample can be evaluated. In addition, the preset static temperature and preset static relative humidity in step S102 are used to simulate a humid environment and keep the temperature and relative humidity of the lamp samples consistent, thereby ensuring that the overall temperature and internal humidity conditions of each lamp sample are consistent during the formal experiment.

[0058] After completing the above pretreatment steps, the formal test can be carried out. Specifically, the formal test steps include S20-S30.

[0059] After the vehicle is started and during driving, the engine generates heat. In the formal test of the automotive lighting fogging test method of this application embodiment, the engine operation scenario is simulated by setting the temperature of the fogging test chamber.

[0060] S20. Place the lamp sample in a fog test chamber, turn on the lamp and keep it there for a first preset time. The temperature of the fog test chamber is set to the preset test temperature and the relative humidity is set to the preset test humidity.

[0061] Furthermore, in this embodiment, the preset test temperature is 50°C, the preset test humidity is 60%RH, and the first preset time is 1.5h.

[0062] It should be noted that in this embodiment, the fog test chamber is equipped with wiring for connecting to an external power source, and all lamp samples are equipped with wiring for connecting to an external power source.

[0063] Furthermore, the external power supply can be a 12V DC power supply. After the lamp sample is transferred to the fog test chamber, it is connected to the 12V DC power supply, so that the lamp sample can be lit.

[0064] It is understandable that this embodiment simulates the fog-generating environment by designing the temperature and humidity of the fog test chamber and the spraying process. Furthermore, the automotive lighting fog test method in this embodiment moves the test scenario from a real vehicle to a laboratory, simplifying the test procedure in simulating the fog-generating environment. In addition, the automotive lighting fog test method in this embodiment does not perform zoned control of the lighting samples; the test can be completed using common testing equipment, increasing the operability of the test.

[0065] Furthermore, in this embodiment, the headlights are illuminated by activating the high beam, low beam, and position lights; the taillights are illuminated by activating the position lights, brake lights, and turn signals. If other usage conditions need to be simulated, relevant technicians can also set the lighting method according to the usage conditions.

[0066] Fogging caused by large temperature differences is usually due to the condensation of water vapor on the surface of the lamps caused by alternating hot and cold temperatures. For example, when a vehicle is driven out of the garage in winter, the temperature drops suddenly, causing fogging on the outer surface of the car lights, while the high-pressure water spray during a car wash causes fogging on the inner surface of the car lights.

[0067] Furthermore, in this embodiment, after step S20 simulates the real vehicle environment of engine operation, cold water is sprayed to simulate the temperature changes of alternating hot and cold.

[0068] S30. Turn off the lights and wait for the temperature of the left zone of the lamp sample to drop to room temperature before spraying. The left zone refers to the side of the lamp surface of the lamp sample.

[0069] Furthermore, after the temperature in the left zone drops to room temperature, water at a preset spray temperature is sprayed, and this continues for a fourth preset time.

[0070] Furthermore, in this embodiment, the room temperature is 25℃±3℃, the preset spray temperature is 10℃±2℃, and the fourth preset time is 1min.

[0071] Understandably, the sprinkler system mimics a user scenario: after the lights are turned off, one side of the headlight or taillight surface comes into contact with the external environment and gradually cools down. In this embodiment, the sprinkler system needs to cover the left area, meaning the spray area needs to cover the entire light surface.

[0072] It should be noted that in this embodiment, the left area of ​​the lamp sample refers to the lamp surface side, i.e., the part exposed outside the vehicle body when installed, while the right area refers to the wall thickness side. In this embodiment, the different natural cooling rates of different wall thickness areas of the lamp sample are used to simulate the low temperature of the exposed parts of the headlights or taillights in actual use scenarios.

[0073] After completing the above formal test steps, it is necessary to observe and evaluate the fogging situation of the lamp samples.

[0074] S40. Record the fogging and fog dissipation of the lamp samples after spraying.

[0075] Specifically, the fogging status of the lamp samples was recorded within the fifth preset time after spraying; the fog dissipation status of the lamp samples was recorded within the sixth preset time after spraying.

[0076] Furthermore, in this embodiment, the fifth preset time is 15 minutes, and the sixth preset time is 1 hour.

[0077] In this embodiment, a high-definition camera can be used to observe and photograph the fogging and fog dissipation of the lamp sample in real time.

[0078] During the design phase of lighting fixtures, a series of anti-fogging measures should be considered to ensure that the fixtures provide clear illumination under various weather conditions. From a design perspective, fogging can be prevented by selecting appropriate anti-fogging materials, optimizing the structural design of the fixtures, and implementing suitable ventilation systems. Conducting fogging tests on automotive lighting fixtures during the design phase allows for the early detection of potential problems and the implementation of corresponding improvement measures, thereby enhancing the reliability and safety of the fixtures. This proactive design approach not only reduces the risk of fogging but also lowers the costs of subsequent maintenance and replacement, improving overall product quality.

[0079] Airflow is a crucial factor in fog formation, making the optimization of the ventilation structure of automotive taillights a key design consideration. The fogging test of automotive lights in this embodiment allows for the optimization of the ventilation structure of existing taillights. The ventilation structure of the automotive taillight includes a ventilation membrane, a ventilation cap, a ventilation cover, and a ventilation bend.

[0080] In one specific embodiment, an automotive lighting fogging test is used to verify the effect of the number of vent caps on the fogging and fog dissipation of automotive taillights. For example, for a certain model of automotive taillight with two vent caps, three test groups can be designed. The lamp samples in the three test groups have different numbers of vent caps. Specifically, the lamp samples in the first test group have zero vent caps blocked, the lamp samples in the second test group have one vent cap blocked, and the lamp samples in the third test group have two vent caps blocked.

[0081] Referring to Table 1, all three groups of lamp samples were equipped with desiccant, had their breathable membranes blocked, and used true breathable caps.

[0082] It should be noted that the desiccant refers to the soft rubber cover located inside the lamp; the breathable membrane is usually located at the sharp corner of the lamp, and it is used for ventilation, allowing gas to pass through freely. Under normal circumstances, water vapor in the air can diffuse before condensation; a true breathable cap means a breathable cap with strong breathability, while a false breathable cap means a breathable cap with poor breathability.

[0083]

[0084] Table 1

[0085] Furthermore, following the steps of the above-mentioned automotive lighting fogging test method and the test conditions designed in Table 1, tests were conducted on the lighting samples of the three test groups respectively:

[0086] The lamp samples from the three test groups were visually inspected to check for any defects: the surface of the lamp samples was checked for spots, cracks, and deformation; the reflectors and decorative rings were checked for dust spots, bubbles, missing galvanizing, and missing paint.

[0087] After passing the visual inspection, the lamp samples are pretreated. The back cover of the lamp sample is opened and it is placed in a standard temperature and humidity chamber at 60℃ for 4 hours to dry. After drying, the desiccant, breathable membrane and breathable cap are treated according to the preset test conditions and the lamp sample is installed. Then the lamp sample is placed in a standard humidity chamber at 20℃ and 90% RH and left to stand for 16 hours.

[0088] For example, for the second test group, after drying, the desiccant needs to be installed, and the breathable membrane and a breathable cap need to be plugged before installing the lamp sample.

[0089] After pretreatment, the formal test begins. The lamp samples are transferred to a fog test chamber at 50°C and 60% RH, and connected to a 12V DC power supply. The position lights, brake lights, and turn signals of the lamp samples are continuously lit and left for 1.5 hours. The lighting includes high beams, low beams, and position lights.

[0090] Turn off the lights and wait for the temperature of the left area of ​​the lamp sample to drop to room temperature (25℃±3℃). Then spray it continuously with water at 10℃±2℃ for 1 minute, covering the entire lamp surface.

[0091] The fogging of the lamp samples in each test group was recorded within 15 minutes after spraying using a high-definition camera; the fog dissipation of the lamp samples in each test group was recorded within 1 hour after spraying using a high-definition camera.

[0092] The results of this experiment are shown in Table 1. All three groups of lamp samples fogged up within 15 minutes after spraying. Analysis of these results indicates that the number of vent caps on the taillights has little impact on fogging.

[0093] In one specific embodiment, an automotive lighting fogging test is used to verify the effects of true and false vent caps on the fogging and fog dissipation of automotive taillights. For example, for a certain model of automotive taillight, two test groups can be designed, with the lamp samples in the two test groups equipped with true and false vent caps respectively. Specifically, the lamp samples in the fourth test group are equipped with false vent caps, and the lamp samples in the fifth test group are equipped with true vent caps.

[0094] The experimental conditions for the two experimental groups are shown in Table 2.

[0095]

[0096] Table 2

[0097] Furthermore, following the steps of the lamp fogging test method and the test conditions designed in Table 2, the lamp samples of the two test groups were tested respectively.

[0098] The results of this experiment are shown in Table 2. The lamp samples in the fourth test group fogged within 15 minutes after spraying, and the fog did not dissipate within 1 hour. The lamp samples in the fifth test group fogged within 15 minutes after spraying, but the amount of fog was less, and the fog dissipated within 15 minutes. Analysis of these test results shows that, for the problem of lamp fogging, the performance of a genuine ventilated cap is superior to that of a fake ventilated cap.

[0099] Based on the test results in the two embodiments above, the car taillight can be optimized. For example, the number of vent caps can be appropriately reduced according to design requirements, and true vent caps can be used during production. That is, the car lamp fogging test method in this application can be used to optimize the structural design of the lamp to reduce the risk of fogging.

[0100] From a quality control perspective, conducting fogging tests on automotive lights during factory production can promptly identify fogging issues caused by manufacturing defects, effectively ensuring product quality. For example, sampling tests can be performed on automotive lights before they leave the factory or are installed in a vehicle to ensure that the lights do not fog up or can dissipate quickly under simulated fog conditions.

[0101] This embodiment also provides an automotive lighting fogging test system, including a standard temperature and humidity chamber, a fogging test chamber, an external power supply, and a camera device.

[0102] A schematic diagram of the lamp fogging test system in this embodiment is shown below. Figure 2 As shown, the standard temperature and humidity chamber is used to pre-treat the lamp samples, the fog test chamber is used to simulate the environment in which fog is generated, the camera equipment is used to record the fog formation and fog dissipation, and the fog test chamber is equipped with a channel for connecting an external power supply to the lamp samples.

[0103] Furthermore, the mist test chamber is equipped with a spraying mechanism, which includes a spraying hose and a temperature control system. The temperature control system is used to control the water flow temperature of the spraying hose.

[0104] In this embodiment, the external power supply is a 12V DC power supply, and the camera device is a high-definition camera. The camera device is located one meter away from the fog test chamber and faces the observation window of the fog test chamber.

[0105] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0106] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for testing fogging in automotive lighting, characterized in that, include: The lamp sample is placed in a fog test chamber, lit, and left for a first preset time. The temperature of the fog test chamber is set to a preset test temperature, and the relative humidity is set to a preset test humidity. The lamp sample includes automotive headlights and automotive taillights. Before the step of placing the lamp sample in the fog test chamber, turning on the lamp, and continuously placing it for a first preset time, the following is also included: The lamp sample was pretreated in a standard temperature and humidity chamber. Adjust the temperature of the standard temperature and humidity chamber to the preset drying temperature, place the turned-on lamp sample in the standard temperature and humidity chamber and leave it there for a second preset time. The lamp sample was taken out and installed, and the temperature of the standard temperature and humidity chamber was adjusted to the preset static temperature and the relative humidity was adjusted to the preset static relative humidity. The preset static temperature and the preset static relative humidity are used to simulate a humid environment and keep the temperature and relative humidity of the lamp sample consistent. The installed lamp sample was placed in the standard temperature and humidity chamber and left there for a third preset time. Turn off the lights, and after the temperature of the left area of ​​the lamp sample drops to room temperature, spray it with water at a preset spray temperature for a fourth preset time. The room temperature is 25℃±3℃, and the preset spray temperature is 10℃±2℃. The left area refers to the lamp surface side of the lamp sample, that is, the part exposed outside the vehicle body when it is installed. Spraying the left area means that the water spray area covers the entire lamp surface. The right area of ​​the lamp sample refers to the wall thickness side. By utilizing the different natural cooling rates of different wall thickness areas of the lamp sample, the low temperature of the exposed parts of the headlights or taillights in actual use scenarios is simulated.

2. The method for testing fogging in automotive lighting as described in claim 1, characterized in that, The preset drying temperature is 60℃, and the second preset time is 4 hours; The preset resting temperature is 20℃, the preset resting relative humidity is 90%RH, and the third preset time is 16h.

3. The method for testing fogging in automotive lighting as described in claim 1, characterized in that, The preset test temperature is 50℃, the preset test humidity is 60%RH, and the first preset time is 1.5h.

4. The method for testing fogging in automotive lighting as described in claim 1, characterized in that, The fourth preset time is 1 minute.

5. The method for testing fogging in automotive lighting as described in claim 1, characterized in that, After the left zone temperature of the lamp sample has dropped to room temperature, the spraying process further includes: Record the fogging and fog dissipation of the lamp samples after spraying: Record the fogging status of the lamp sample within the fifth preset time period; Record the fog dissipation of the lamp sample within the sixth preset time period.

6. The method for testing fogging in automotive lighting as described in claim 5, characterized in that, The fifth preset time is 15 minutes, and the sixth preset time is 1 hour.

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