Method for testing demisting area of windscreen of vehicle

Abstract

The invention provides a method for testing the demisting area of a vehicle windscreen, and relates to the technical field of vehicle windscreen demisting tests.The method comprises the steps that a vehicle is driven into a closed test cabin, the internal environment of the closed test cabin is adjusted through an environment adjusting unit, and the vehicle windscreen is fogged; the vehicle air conditioning system is controlled by the vehicle machine system to demist the windshield glass under the preset duration condition; collecting the demisting area of the windscreen of the vehicle through a non-contact monitoring unit; and judging whether the demisting area of the vehicle windscreen meets the standard or not, and outputting a judgment result. On one hand, the test environment can be accurately controlled, on the other hand, manual intervention is reduced as much as possible in the test process, manpower can be saved, the test efficiency is improved, the accuracy of collected data is improved, and the effectiveness and accuracy of a test result are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle windshield defogging testing, and in particular to a method for testing the defogging area of ​​a vehicle windshield. Background Art

[0002] Due to inconsistent temperatures inside and outside the car, when the humidity inside or outside the car is high, the car windshield will fog up, affecting the driver's vision and easily leading to accidents. Currently, most vehicles defog their windshields through their own air conditioning systems. Before a vehicle leaves the factory, it needs to be tested for windshield defogging. This includes checking whether the windshield defogging area can reach a specified value within a specified time and whether the defogging area covers the specified area on the windshield. Currently, the general method for testing the defogging area of ​​a vehicle windshield is to draw the boundaries of windshield areas A and B and the actual defogging area on the car windshield, then trace them on paper, and then measure and calculate the area of ​​the corresponding area on the paper. This method requires many manual steps during operation, and the measurement results often have large errors. Therefore, it is necessary to develop a more automated and accurate vehicle windshield defogging area testing method. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for testing the defogging area of ​​a vehicle windshield, so as to solve the problems that the current method for testing the defogging area of ​​a vehicle windshield has a low degree of automation and the test results are not accurate enough.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: A method for testing the defogging area of ​​a vehicle windshield, the method comprising: The vehicle is driven into a closed test chamber, and the internal environment of the closed test chamber is adjusted by the environmental adjustment unit to fog the vehicle windshield; Control the vehicle air conditioning system through the vehicle computer system to defog the windshield under preset time conditions; The defogging area of ​​the vehicle windshield is collected through a non-contact monitoring unit; Determine whether the vehicle's windshield defogging area meets the standards and output the judgment result.

[0005] Furthermore, the adjustment of the internal environment of the closed test chamber by the environmental adjustment unit specifically includes the following operations: Setting environmental parameters, including temperature and humidity, through the test terminal, and sending the environmental parameters to the environmental conditioning unit of the closed test chamber; The environmental conditioning unit adjusts the internal environment of the closed test chamber according to environmental parameters, including the adjustment of ambient temperature and humidity; Record environmental parameter setting instructions and environmental data inside the closed test chamber.

[0006] Furthermore, the vehicle air conditioning system is controlled by the vehicle computer system to defog the windshield under a preset time condition, specifically including: When the environmental data in the closed test chamber meet the environmental parameter setting instructions, the test terminal establishes a wireless connection with the vehicle's on-board system and sends a defogger instruction with a limited time to the vehicle's on-board system; After receiving the defog command, the vehicle's onboard system starts the air conditioning system to defog the windshield, and stops defogging after the defog duration reaches the limit; After stopping defogger, feedback information is sent to the test terminal.

[0007] Furthermore, the non-contact monitoring unit includes an infrared thermal imaging device and a photoelectric sensor array, and the vehicle windshield defogging area is collected by the non-contact monitoring unit, specifically including: The vehicle windshield surface temperature field data is collected in real time during the test using infrared thermal imaging equipment; A lighting unit is provided on one side of the vehicle windshield, and a photoelectric sensor array is provided on the other side, and the fogging area and the defogging area of ​​the vehicle windshield are measured respectively by the photoelectric sensor array; Analyze the active area of ​​the vehicle air conditioning system based on the real-time vehicle windshield surface temperature field data during the test; Determine whether the fogging area of ​​the vehicle's windshield meets the test requirements.

[0008] Furthermore, the fogging area or the defogging area of ​​the vehicle windshield is measured by a photoelectric sensor array, specifically including: Divide the vehicle windshield into The relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets is modeled as follows:

[0009] In the above formula, Represents the scattered light intensity received by the photosensor array, Represents the light intensity of the lighting unit, represents the optical parameters of the system, represents the droplet density, represents the droplet extinction coefficient, represents the equivalent fog layer thickness; The light scattering intensity of each cell in the grid is used to determine whether the cell is covered by droplets. The expression is as follows:

[0010] In the above formula, Indicates the Whether the cell is covered by droplets, when Indicates that the cell is covered by droplets. Indicates that the cell is not covered by fog droplets. Indicates that the photoelectric sensor array receives the The scattered light intensity of each cell, Represents the reference intensity of scattered light when the cell is fully covered by droplets, is the preset threshold; Calculate the fog coverage of the mesh , the calculation formula is as follows:

[0011] According to the overall area of ​​the grid and whether it is in the fogging stage or the defogging stage when calculating the fog coverage, the corresponding fogging area or defogging area is obtained.

[0012] Furthermore, whether the defogging area of ​​the vehicle windshield meets the standards is judged, specifically including: Obtain the standard defogging area and standard defogging zone of the vehicle windshield from the industry standard database; Determining whether the defogging area of ​​the vehicle windshield within the limited time is greater than or equal to the standard defogging area to obtain a first determination result; Determine the cells in the grid corresponding to the standard defogging area, mark them as standard defogging cells, and determine whether the cells covered by the defogging area match the standard defogging cells to obtain a second determination result; Combine the first judgment result and the second judgment result to determine whether the defogging area of ​​the vehicle windshield meets the standard.

[0013] Furthermore, before meshing the vehicle windshield, perform the following operations: Obtaining a standard defogging area of ​​a vehicle windshield from an industry standard database, determining a portion of the vehicle windshield corresponding to the standard defogging area, and marking the portion as a standard field of view area; The vehicle windshield is meshed, where the cell density in the standard field of view area is higher than that in the non-standard field of view area.

[0014] Furthermore, a portion of the vehicle windshield corresponding to the standard defogging area is determined and marked as the standard field of view area, specifically including: Collect laser point cloud data of the vehicle windshield and photoelectric sensor array, and construct a relative point cloud model of the windshield and photoelectric sensor array; Calculate the boundary coordinates of the standard defogging area on the windshield in the relative point cloud model and divide the standard field of view area; A photosensor in the photosensor array corresponding to the standard field of view is determined.

[0015] Furthermore, when modeling the relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets, compensation correction is performed on the scattered light intensity received by the photoelectric sensor array based on the vehicle windshield material process data, specifically including the following operations: Obtain the vehicle model, query the vehicle information database based on the vehicle model, and obtain the vehicle windshield material process data; Determine reflectivity parameters based on vehicle windshield material process data and coating extinction coefficient ; The reflectivity compensation coefficient is calculated based on the detection angle of the photoelectric sensor array relative to the windshield. The calculation formula is as follows:

[0016] In the above formula, Indicates the detection angle is Reflectivity compensation coefficient; The scattered light intensity is compensated and corrected according to the reflectivity compensation coefficient and the coating extinction coefficient. The expression is as follows:

[0017] In the above formula, It represents the scattered light intensity after compensation correction. Represents the raw scattered light intensity reading collected by the photosensor array, Indicates the ambient background light intensity.

[0018] Furthermore, the test process is recorded to generate test process record data, and the test process record data and judgment results are written into the blockchain for storage.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The method provided by the present invention tests the windshield defogging area of ​​a vehicle in a closed test chamber. The vehicle windshield fogs up using an environmental conditioning unit. The vehicle's air conditioning system is then controlled by the vehicle's onboard system to defog the windshield for a preset duration. This allows for precise control of the test environment to meet test standards and requirements. 2. The present invention collects the defogging area of ​​the vehicle windshield through a non-contact monitoring unit, judges whether the defogging area of ​​the vehicle windshield meets the standard based on the collected data, and outputs the judgment result. This process does not require manual collection and calculation, which can save manpower, improve test efficiency, and improve the accuracy of the collected data, thereby ensuring the validity and accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The figure is a schematic diagram of the overall process of a method for testing the defogging area of ​​a vehicle windshield provided by an embodiment of the present invention.

[0021] Figure 2 It is a flow chart of a method for adjusting the internal environment of a closed test chamber through an environmental adjustment unit provided in an embodiment of the present invention.

[0022] Figure 3 It is a flow chart of a method for controlling the defogger of a vehicle air-conditioning system through a vehicle computer system provided by an embodiment of the present invention.

[0023] Figure 4 The present invention provides a method for collecting the defogging area of ​​a vehicle windshield through a non-contact monitoring unit.

[0024] Figure 5 It is a flow chart of a method for measuring fogging area or defogging area by using a photoelectric sensor array provided in an embodiment of the present invention.

[0025] Figure 6 It is a flow chart of determining whether the defogging area of ​​a vehicle windshield meets the standards provided by an embodiment of the present invention.

[0026] Figure 7 It is a flow chart of a method for grid cell density encryption provided by an embodiment of the present invention.

[0027] Figure 8 This is a schematic diagram of the standard visual field area marking process provided by an embodiment of the present invention.

[0028] Figure 9 It is a schematic diagram of the scattered light intensity compensation correction process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The enumerated embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] Reference Figure 1 This embodiment provides a method for testing the defogging area of ​​a vehicle windshield, the method comprising: S101: Drive a vehicle into a closed test chamber, and adjust the internal environment of the closed test chamber by using an environmental adjustment unit to fog the vehicle windshield.

[0031] In this embodiment, the environmental conditioning unit includes, but is not limited to, cooling and heating air conditioning equipment, humidification equipment, and dehumidification equipment. The environmental conditioning unit primarily regulates the temperature and humidity within the closed test chamber, creating a temperature and humidity differential between the vehicle's interior and exterior to fog the vehicle's windshield.

[0032] S102: Controlling the vehicle air conditioning system through the vehicle computer system to defog the windshield within a preset time period.

[0033] S103: Collect the defogging area of ​​the vehicle windshield through a non-contact monitoring unit.

[0034] S104: Determine whether the vehicle windshield defogging area meets the standard and output the determination result.

[0035] In this implementation, after the vehicle enters the enclosed cockpit, the environmental conditioning unit controls the internal environment of the test chamber, changing the ambient temperature and causing the vehicle's windshield to fog. The vehicle's onboard computer system then controls the vehicle's air conditioning system to defog the windshield for a preset duration, thereby achieving precise automated control of the test conditions. After the windshield fogs, the non-contact monitoring unit collects the defogging area of ​​the windshield and determines whether the defogging area meets the standard. The determination result is automatically output, eliminating the need for manual data collection and calculation. This reduces labor input and improves the accuracy of the collected data, thereby ensuring the validity and accuracy of the test results.

[0036] As a possible implementation method, refer to Figure 2 , the environmental conditioning unit is used to adjust the internal environment of the closed test chamber, specifically including the following operations: S201 : Setting environmental parameters through a test terminal, wherein the environmental parameters include temperature and humidity, and the test terminal sends the environmental parameters to an environmental adjustment unit of a closed test cabin.

[0037] In this embodiment, the test terminal can be a PC, a smart phone, a tablet computer, or a laptop computer. The test terminal and the environment adjustment unit are connected via a network, so that data can be exchanged between the test terminal and the environment adjustment unit.

[0038] S202. The environment adjustment unit adjusts the internal environment of the closed test chamber according to the environmental parameters, including adjusting the ambient temperature and humidity.

[0039] S203. Record the environmental parameter setting instructions and the internal environmental data of the closed test chamber.

[0040] In this embodiment, during the test process, all environmental parameter setting instructions sent by the test terminal to the environmental adjustment unit, as well as the internal environmental data of the closed test chamber at each time point during the test process are automatically recorded, so as to facilitate the subsequent analysis of the recorded data to determine whether the test instructions and test environmental conditions comply with relevant standards and regulations.

[0041] For example, the internal environmental data of the closed test chamber can be collected by a temperature and humidity sensor set in the closed test chamber. The collected internal environmental data is transmitted to the test terminal for display to the tester, and is also transmitted to the background server for recording.

[0042] At the same time, refer to Figure 3 , the vehicle air conditioning system is controlled by the vehicle computer system to defog the windshield under the preset time conditions, specifically including: S301. When the environmental data in the closed test chamber meet the environmental parameter setting instructions, the test terminal establishes a wireless connection with the vehicle's on-board system and sends a defogger instruction with a limited time to the vehicle's on-board system.

[0043] S302: After receiving the defogger command, the vehicle system starts the air conditioning system to defog the windshield, and stops defoggering after the defogger duration reaches a limit.

[0044] S303: After stopping the defogger, feedback information is sent to the test terminal.

[0045] With the development of new energy vehicles, the current level of intelligence of vehicle-mounted systems has been greatly improved. Remotely sending air-conditioning start-up commands to the vehicle-mounted system via a smartphone has become a standard feature of many new energy vehicles. In this implementation, the test terminal and the vehicle-mounted system exchange data wirelessly. After observing that the vehicle windshield is covered with fog, the tester sends a defogger command to the vehicle-mounted system through the test terminal. After receiving the defogger command, the vehicle-mounted system starts the air-conditioning system to defog the windshield, and stops defoggering after the defogger duration reaches a limit. The purpose of limiting the defogger duration is to control variables and observe whether the vehicle can effectively defog the windshield within the specified time. When the vehicle stops defoggering, feedback information is sent to the test terminal to promptly proceed to the next stage of testing.

[0046] As another possible implementation, the non-contact monitoring unit includes an infrared thermal imaging device and a photoelectric sensor array, wherein the photoelectric sensor array is composed of a plurality of photoelectric sensors. Figure 4 , the vehicle windshield defogging area is collected through a non-contact monitoring unit, specifically including: S401. Collect vehicle windshield surface temperature field data in real time during the test using infrared thermal imaging equipment.

[0047] S402: Setting a lighting unit on one side of the vehicle windshield and a photoelectric sensor array on the other side, and measuring the fogging area and the defogging area of ​​the vehicle windshield respectively by the photoelectric sensor array.

[0048] S403: Analyze the effective area of ​​the vehicle air conditioning system based on the real-time vehicle windshield surface temperature field data during the test.

[0049] S404: Determine whether the fogging area of ​​the vehicle windshield meets the test requirements.

[0050] In this embodiment, the non-contact monitoring unit measures the vehicle windshield surface temperature field data, fogging area, and defogging area using infrared thermal imaging and photoelectric sensors, respectively. Measuring the fogging area accurately determines whether testing can begin, avoiding inaccurate test results caused by conducting tests when the fogging area is small. The windshield surface temperature field data during the defogging process can be used to analyze the primary impact area of ​​the windshield during defogging by the vehicle air conditioning system. By combining this defogging effect analysis with the defogging area, the air outlet area, defogging mode air volume, and temperature of the vehicle air conditioning system can be optimized to achieve a better defogging effect.

[0051] On this basis, refer to Figure 5 , respectively measuring the fogging area or defogging area of ​​the vehicle windshield through a photoelectric sensor array, specifically including: S501, dividing the vehicle windshield into The relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets is modeled as follows:

[0052] In the above formula, Represents the scattered light intensity received by the photosensor array, Represents the light intensity of the lighting unit, represents the optical parameters of the system, represents the droplet density, represents the droplet extinction coefficient, Represents the equivalent fog layer thickness.

[0053] In fog-free areas of a vehicle's windshield, light from the illumination unit passes directly through the windshield. However, in foggy areas, fog droplets on the windshield surface scatter the light, causing variations in the light intensity received by the photosensor array on the other side of the windshield. The scattered light intensity is measured by positioning the photosensor array at a specific angle (for example, 30°) to the windshield normal. Higher fog droplet density indicates greater scattered light, while in transparent areas of the glass, scattered light approaches zero.

[0054] S502: Determine whether the cell is covered by fog droplets based on the light scattering intensity of each cell in the grid. The expression is as follows:

[0055] In the above formula, Indicates the Whether the cell is covered by droplets, when Indicates that the cell is covered by droplets. Indicates that the cell is not covered by fog droplets. Indicates that the photoelectric sensor array receives the The scattered light intensity of each cell, Represents the reference intensity of scattered light when the cell is fully covered by droplets, is the preset threshold. It can be set to 0.15, which means there is no fog when the scattered light intensity is attenuated by 85%.

[0056] S503, calculate the fog coverage of the grid , the calculation formula is as follows:

[0057] S504: Obtain a corresponding fogging area or defogging area according to the overall area of ​​the grid and whether the fog coverage is in the fogging stage or the defogging stage when calculating the fog coverage.

[0058] In this embodiment, the photosensors in the photosensor array correspond one-to-one to the cells in the grid. Based on the scattered light intensity received by each photosensor, the corresponding cell is analyzed for fog droplet coverage. Essentially, this method inverts the fog droplet distribution density by quantifying the scattering attenuation effect of the fog layer on light. By analyzing the fog droplet coverage of all cells in the grid and the area of ​​each cell, the overall fog droplet coverage of the grid can be calculated. It is understood that if the measurement is taken before the defogging test begins, the fogged area is obtained; if the measurement is taken after the defogging test is completed, the defogging area is obtained.

[0059] Based on the above implementation, Figure 6 , to determine whether the vehicle windshield defogging area meets the standards, including: S601. Obtain a standard defogging area and a standard defogging zone for a vehicle windshield from an industry standard database.

[0060] S602: Determine whether the defogging area of ​​the vehicle windshield within the limited time is greater than or equal to the standard defogging area, and obtain a first determination result.

[0061] S603: Determine the cells in the grid corresponding to the standard defogging area, mark them as standard defogging cells, and determine whether the cells covered by the defogging area match the standard defogging cells to obtain a second determination result.

[0062] S604: Determine whether the defogger area of ​​the vehicle windshield meets the standard by combining the first judgment result and the second judgment result.

[0063] In this embodiment, the first judgment result reflects whether the vehicle air-conditioning system can defog a sufficiently large area of ​​the windshield within the limited time, and the second judgment result reflects whether the vehicle air-conditioning system can effectively defog the area that most affects the driver's field of vision. By combining the first judgment result and the second judgment result, it is judged whether the defog area of ​​the vehicle windshield meets the standard. That is to say, the defog area of ​​the vehicle air-conditioning system within the limited time must not only be large enough, but also be able to cover the area that most affects the driver's field of vision, that is, areas A and B on the vehicle windshield.

[0064] As a further optional embodiment, refer to Figure 7 Before meshing the vehicle windshield, do the following: S701. Obtain a standard defogging area of ​​a vehicle windshield from an industry standard database, determine a portion of the vehicle windshield corresponding to the standard defogging area, and mark the portion as a standard field of view area.

[0065] In this embodiment, the industry standard database stores standard defogging area data for windshields of different vehicles.

[0066] S702 . Divide the vehicle windshield into grids, wherein the cell density in the standard viewing area is higher than the cell density in the non-standard viewing area.

[0067] This method increases the cell density in the standard field of view area of ​​the windshield grid to improve the accuracy of fog droplet detection in the standard field of view area, thereby enabling more accurate detection of the defogging effect of the vehicle air-conditioning system on the key field of view area of ​​the windshield without increasing the number of photoelectric sensors too much.

[0068] Among them, the part of the vehicle windshield that corresponds to the standard defogging area is determined and marked as the standard field of view area. Figure 8 , specifically including: S801: Collect laser point cloud data of the vehicle windshield and the photoelectric sensor array, and construct a relative point cloud model of the windshield and the photoelectric sensor array.

[0069] S802: Calculate the boundary coordinates of the standard defogging area on the windshield in the relative point cloud model, and divide the standard field of view area.

[0070] S803: Determine the photosensor in the photosensor array that corresponds to the standard field of view area.

[0071] For example, the photoelectric sensors corresponding to the standard field of view area in the photoelectric sensor array can be determined by simulating the scattered light path generated when light passes through the standard field of view area, and the final incident point of the scattered light path on the photoelectric sensor array. Based on the scattered light intensity data received by these photoelectric sensors and combined with the aforementioned defogger area calculation method, the fog droplet coverage and defogger conditions of the standard field of view area of ​​the vehicle windshield can be calculated.

[0072] As another possible implementation method, refer to Figure 9 When modeling the relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets, the scattered light intensity received by the photoelectric sensor array is compensated and corrected based on the vehicle windshield material process data. Specifically, the following operations are performed: S901: Obtain a vehicle model, query a vehicle information database based on the vehicle model, and obtain vehicle windshield material and process data.

[0073] Illustratively, the vehicle windshield material and process data includes, but is not limited to, the material, processing technology, and structural information of the vehicle windshield.

[0074] S902: Determine reflectivity parameters based on vehicle windshield material process data and coating extinction coefficient .

[0075] S903. Calculate a reflectivity compensation coefficient based on the detection angle of the photoelectric sensor array relative to the windshield. The calculation formula is as follows:

[0076] In the above formula, Indicates the detection angle is Reflectivity compensation coefficient.

[0077] S904. Compensate and correct the scattered light intensity based on the reflectivity compensation coefficient and the coating extinction coefficient. The expression is as follows:

[0078] In the above formula, It represents the scattered light intensity after compensation correction. Represents the raw scattered light intensity reading collected by the photosensor array, Indicates the ambient background light intensity.

[0079] The structure and manufacturing process of the vehicle windshield will affect the scattered light intensity of the incident light. If this factor is not taken into account, it is easy to cause deviations in the test results. This embodiment obtains the material and process data of the vehicle windshield by querying the vehicle information database, and determines the reflectivity parameter based on the material and process data of the vehicle windshield. and coating extinction coefficient , and further calculate the reflectivity compensation coefficient based on the detection angle of the photoelectric sensor array relative to the windshield, and compensate and correct the scattered light intensity based on the reflectivity compensation coefficient and the coating extinction coefficient, thereby further improving the accuracy of the test results.

[0080] In this embodiment, during the test of the vehicle windshield defogging area, all data generated is recorded, including but not limited to commands issued by the test terminal, changes in the closed test chamber's internal environment, various operations performed by the vehicle's onboard system, and test data, to generate test process records. This test process record data and judgment results are written to the blockchain for storage, facilitating subsequent traceability and ensuring the security, authenticity, and validity of the test data.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing the defogging area of ​​a vehicle windshield, characterized in that: The method comprises: The vehicle is driven into a closed test chamber, and the internal environment of the closed test chamber is adjusted by the environmental adjustment unit to fog the vehicle windshield; Control the vehicle air conditioning system through the vehicle computer system to defog the windshield under preset time conditions; The defogging area of ​​the vehicle windshield is collected through a non-contact monitoring unit; Determine whether the vehicle's windshield defogging area meets the standards and output the judgment result.

2. The method for testing the defogging area of ​​a vehicle windshield according to claim 1, characterized in that: The environmental conditioning unit is used to condition the internal environment of the closed test chamber, specifically including the following operations: Setting environmental parameters, including temperature and humidity, through the test terminal, and sending the environmental parameters to the environmental conditioning unit of the closed test chamber; The environmental conditioning unit adjusts the internal environment of the closed test chamber according to environmental parameters, including the adjustment of ambient temperature and humidity; Record environmental parameter setting instructions and environmental data inside the closed test chamber.

3. The method for testing the defogging area of ​​a vehicle windshield according to claim 2, wherein: The vehicle air conditioning system is controlled by the vehicle computer system to defog the windshield under preset time conditions, specifically including: When the environmental data in the closed test chamber meet the environmental parameter setting instructions, the test terminal establishes a wireless connection with the vehicle's on-board system and sends a defogger instruction with a limited time to the vehicle's on-board system; After receiving the defog command, the vehicle's onboard system starts the air conditioning system to defog the windshield, and stops defogging after the defog duration reaches the limit; After stopping defogger, feedback information is sent to the test terminal.

4. The method for testing the defogging area of ​​a vehicle windshield according to claim 1, wherein: The non-contact monitoring unit includes an infrared thermal imaging device and a photoelectric sensor array. The non-contact monitoring unit collects the defogging area of ​​the vehicle windshield, specifically including: The vehicle windshield surface temperature field data is collected in real time during the test using infrared thermal imaging equipment; A lighting unit is provided on one side of the vehicle windshield, and a photoelectric sensor array is provided on the other side, and the fogging area and the defogging area of ​​the vehicle windshield are measured respectively by the photoelectric sensor array; Analyze the active area of ​​the vehicle air conditioning system based on the real-time vehicle windshield surface temperature field data during the test; Determine whether the fogging area of ​​the vehicle's windshield meets the test requirements.

5. The method for testing the defogging area of ​​a vehicle windshield according to claim 4, characterized in that: The fogging area or defogging area of ​​the vehicle windshield is measured by a photoelectric sensor array, specifically including: Divide the vehicle windshield into The relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets is modeled as follows: In the above formula, Represents the scattered light intensity received by the photosensor array, Represents the light intensity of the lighting unit, represents the optical parameters of the system, represents the droplet density, represents the droplet extinction coefficient, represents the equivalent fog layer thickness; The light scattering intensity of each cell in the grid is used to determine whether the cell is covered by droplets. The expression is as follows: In the above formula, Indicates the Whether the cell is covered by droplets, when Indicates that the cell is covered by droplets. Indicates that the cell is not covered by fog droplets. Indicates that the photoelectric sensor array receives the The scattered light intensity of each cell, Represents the reference intensity of scattered light when the cell is fully covered by droplets, is the preset threshold; Calculate the fog coverage of the mesh , the calculation formula is as follows: According to the overall area of ​​the grid and whether it is in the fogging stage or the defogging stage when calculating the fog coverage, the corresponding fogging area or defogging area is obtained.

6. The method for testing the defogging area of ​​a vehicle windshield according to claim 5, characterized in that: Determine whether the vehicle windshield defogging area meets the standards, including: Obtain the standard defogging area and standard defogging zone of the vehicle windshield from the industry standard database; Determining whether the defogging area of ​​the vehicle windshield within the limited time is greater than or equal to the standard defogging area to obtain a first determination result; Determine the cells in the grid corresponding to the standard defogging area, mark them as standard defogging cells, and determine whether the cells covered by the defogging area match the standard defogging cells to obtain a second determination result; Combine the first judgment result and the second judgment result to determine whether the defogging area of ​​the vehicle windshield meets the standard.

7. The method for testing the defogging area of ​​a vehicle windshield according to claim 6, characterized in that: Before meshing the vehicle windshield, do the following: Obtaining a standard defogging area of ​​a vehicle windshield from an industry standard database, determining a portion of the vehicle windshield corresponding to the standard defogging area, and marking the portion as a standard field of view area; The vehicle windshield is meshed, where the cell density in the standard field of view area is higher than that in the non-standard field of view area.

8. The method for testing the defogging area of ​​a vehicle windshield according to claim 7, characterized in that: Determine the portion of the vehicle's windshield that corresponds to the standard defogger area and mark it as the standard field of view area, specifically including: Collect laser point cloud data of the vehicle windshield and photoelectric sensor array, and construct a relative point cloud model of the windshield and photoelectric sensor array; Calculate the boundary coordinates of the standard defogging area on the windshield in the relative point cloud model and divide the standard field of view area; A photosensor in the photosensor array corresponding to the standard field of view is determined.

9. The method for testing the defogging area of ​​a vehicle windshield according to claim 5, characterized in that: When modeling the relationship between the light scattering intensity of the incident light generated by the illumination unit after passing through the windshield and the fog droplets, compensation correction is performed on the scattered light intensity received by the photoelectric sensor array based on the vehicle windshield material process data. Specifically, the following operations are performed: Obtain the vehicle model, query the vehicle information database based on the vehicle model, and obtain the vehicle windshield material process data; Determine reflectivity parameters based on vehicle windshield material process data and coating extinction coefficient ; The reflectivity compensation coefficient is calculated based on the detection angle of the photoelectric sensor array relative to the windshield. The calculation formula is as follows: In the above formula, Indicates the detection angle is Reflectivity compensation coefficient; The scattered light intensity is compensated and corrected according to the reflectivity compensation coefficient and the coating extinction coefficient. The expression is as follows: In the above formula, It represents the scattered light intensity after compensation correction. Represents the raw scattered light intensity reading collected by the photosensor array, Indicates the ambient background light intensity.

10. The method for testing the defogging area of ​​a vehicle windshield according to claim 1, characterized in that: The test process is recorded, test process record data is generated, and the test process record data and judgment results are written into the blockchain for storage.

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