Method for calculating temperature difference between printed and non-printed areas of a vehicle window glass

Abstract

The application provides a temperature difference calculation method for a printed area and a non-printed area of a vehicle window glass, which can realize measurement and evaluation of the temperature difference between the printed area and the non-printed area of the vehicle window glass in the design process of the vehicle window glass, thereby helping to reduce the production cost of the vehicle window glass. The temperature difference calculation method for the printed area and the non-printed area of the vehicle window glass comprises the following steps: obtaining performance parameters of the vehicle window glass, the vehicle window glass being provided with a non-printed area and a printed area arranged around the non-printed area; obtaining performance parameters of a radiation source; simulating heating of the vehicle window glass by the radiation source from the outside of the vehicle window glass to obtain a temperature field distribution result of the vehicle window glass; and obtaining the temperature of the printed area and the temperature of the non-printed area.

Description

Technical Field

[0001] This application relates to the technical field of automotive window glass, and in particular to a method for calculating the temperature difference between the printed and non-printed areas of automotive window glass. Background Technology

[0002] In existing vehicles, car windows typically have printed and non-printed areas. The printed area is usually located at the edge of the window to shield interior components, ensuring a consistent color around the window, improving its appearance, blocking solar radiation, preventing component aging, and extending product stability and lifespan. Because the printed area usually uses materials like black ceramic ink, a significant temperature difference develops between the printed and non-printed areas after sun exposure. Currently, this temperature difference can only be measured and evaluated after the window is manufactured and installed, increasing production costs. Summary of the Invention

[0003] The embodiments of this application provide a method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass. This method enables the measurement and evaluation of the temperature difference between the printed and non-printed areas of the vehicle window glass during the design process, thereby helping to reduce the production cost of the vehicle window glass.

[0004] In a first aspect, this application provides a method for calculating the temperature difference between a printed area and a non-printed area of ​​a vehicle window glass, comprising: obtaining performance parameters of the vehicle window glass, wherein the vehicle window glass has a non-printed area and a printed area surrounding the non-printed area; obtaining performance parameters of a radiation source; simulating the radiation source heating the vehicle window glass from the outside of the vehicle window glass to obtain the temperature field distribution result of the vehicle window glass; and obtaining the temperature of the printed area and the temperature of the non-printed area.

[0005] Wherein, the ratio of the distance between the radiation source and the window glass to the length of the window glass is greater than or equal to 200.

[0006] Wherein, the ratio of the area of ​​the radiation source's radiating surface to the area of ​​the vehicle window glass is greater than or equal to 10.

[0007] The method for calculating the temperature difference between the printed and non-printed areas of the window glass, after obtaining the performance parameters of the radiation source and before simulating the heating of the window glass by the radiation source on the outside of the window glass to obtain the temperature field distribution of the window glass, further includes: constructing a transient thermal model using the performance parameters of the window glass and the performance parameters of the radiation source.

[0008] The vehicle window glass includes a glass substrate and an ink layer, wherein the ink layer is disposed on the surface of the glass substrate and located in the printing area; the step of obtaining the performance parameters of the vehicle window glass includes: obtaining the density, thermal conductivity, and specific heat of the glass substrate; obtaining the density, thermal conductivity, and specific heat of the ink layer; the step of constructing a transient thermal model using the performance parameters of the vehicle window glass and the performance parameters of the radiation source includes: constructing a transient thermal model using the density, thermal conductivity, and specific heat of the glass substrate, the density, thermal conductivity, and specific heat of the ink layer, and the performance parameters of the radiation source.

[0009] The step of simulating the radiation source heating the window glass from the outside to obtain the temperature field distribution of the window glass includes: using finite element software to simulate the radiation source heating the window glass to obtain the temperature field distribution of the window glass.

[0010] Before the step of simulating the heating of the vehicle window glass by the radiation source using finite element software to obtain the temperature field distribution of the vehicle window glass, the method further includes: defining the surface boundary conditions, surface emissivity, and number of radiation sources; defining the surface boundary conditions, surface emissivity, and number of glass substrates; defining the surface boundary conditions, surface emissivity, and number of ink layers; defining the temperature and number of the open space in which the radiation source and the vehicle window glass are located; and defining the Stefan-Boltzmann constant σ = 5.67 × 10⁻⁶. - 8 W / m 2 ·K 4 .

[0011] The number of radiation sources is one or more, the number of glass substrates is one or more, or the number of ink layers is one or more.

[0012] The temperature of the open space where the radiation source and the vehicle window glass are located is 20-25°C.

[0013] The step of obtaining the temperature of the printed area and the temperature of the non-printed area includes: obtaining the temperature of the printed area and the temperature of the non-printed area when the heating time of the simulated heating of the car window glass by the radiation source reaches a preset heating time.

[0014] The preset heating time is multiple. The step of obtaining the temperature of the printed area and the temperature of the non-printed area includes: obtaining the temperature of the printed area and the temperature of the non-printed area when the heating time of the simulated heating of the vehicle window glass by the radiation source reaches any one of the preset heating times; after obtaining the temperature of the printed area and the temperature of the non-printed area, the method for calculating the temperature difference between the printed area and the non-printed area of ​​the vehicle window glass further includes: obtaining the temperature change curve of the printed area under multiple preset heating times; obtaining the temperature change curve of the non-printed area under multiple preset heating times.

[0015] The method for calculating the temperature difference between the printed area and the non-printed area of ​​the vehicle window glass, after the step of obtaining the temperature of the printed area and the non-printed area, further includes: calculating the temperature difference between the printed area and the non-printed area.

[0016] Secondly, this application also provides a computer device, including a memory, a processor, and a computer program, wherein the computer program is stored in the memory and can run on the processor, and when the computer program is executed by the processor, it implements the method for calculating the temperature difference between the printed area and the non-printed area of ​​a car window as described in any of the preceding claims.

[0017] Thirdly, this application also provides a computer-readable storage medium storing instructions that, when executed on a computer, enable the computer to perform the method for calculating the temperature difference between the printed and non-printed areas of a car window as described in any of the preceding claims.

[0018] The technical solution provided in this application, based on the finite element method, simulates the radiation source from the outside of the car window glass to radiate heat to the car window glass. This allows the temperature difference between the printed and non-printed areas of the car window glass to be calculated during the design process, without having to wait for the actual production and installation of the car window glass and then calculate the temperature difference between the printed and non-printed areas through on-site measurement. This helps to reduce the production cost of the car window glass. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0020] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the vehicle window glass shown.

[0022] Figure 3This is a schematic diagram of the structure of a transient thermal model provided by an embodiment of this application;

[0023] Figure 4 yes Figure 2 A flowchart illustrating the method for calculating the temperature difference between the printed and non-printed areas of a car window.

[0024] Figures 5 to 6 This is a schematic diagram of the simulation results of the temperature field distribution of the vehicle window glass in the first embodiment provided in this application;

[0025] Figures 7 to 8 This is a schematic diagram of the simulation results of the temperature field distribution of the vehicle window glass in the second embodiment provided in this application.

[0026] The names corresponding to the labels in the figure are:

[0027] Vehicle 100, body 110, window glass 120, printing area 120a, non-printing area 120b, glass substrate 10, ink layer 20, radiation source 210, transient thermal model 200. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0029] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of a vehicle 100 provided in an embodiment of this application.

[0030] The vehicle 100 provided in the embodiments of this application can be, but is not limited to, a sedan, truck, pickup truck, commercial vehicle, bus, or SUV, and this application makes no limitation thereto. In this embodiment, the vehicle 100 may include a body 110, a window glass 120, a camera sensor (not shown), a following radar (not shown), a sunlight and rain sensor (not shown), and an ambient light sensor (not shown). The body 110 serves to protect the safety of the occupants and create a good in-vehicle air environment. The window glass 120 is fixedly installed on the body 110. Exemplarily, the window glass 120 can be the windshield of the vehicle 100. In some other embodiments, the window glass 120 can also be the rear windshield, side window, or sunroof of the vehicle 100, etc.

[0031] In this embodiment, the camera sensor, following radar, sunlight and rain sensor, and ambient light sensor are all installed on the vehicle window glass 120. Specifically, the camera sensor, following radar, sunlight and rain sensor, and ambient light sensor are all located on the inner side of the vehicle body 110 and the vehicle window glass 120. Ambient light can pass through the vehicle window glass 120 and enter the camera sensor to enable functions such as photographing and identifying obstacles outside the vehicle 100. The sunlight and rain sensor can adjust the operating speed of the automatic wipers according to the amount of rain falling on the vehicle window glass 120, providing the driver with good visibility and greatly improving the safety and convenience of driving the vehicle 100 in rainy weather. The ambient light sensor is used to observe the ambient light intensity and automatically turn on the headlights when the light is dim or the car enters a tunnel.

[0032] Please see Figure 2 , Figure 2 yes Figure 1 This is a schematic diagram of the structure of the window glass 120 in the vehicle 100. The window glass 120 has a printed area 120a and a non-printed area 120b, with the printed area 120a surrounding the non-printed area 120b. The printed area 120a is located at the perimeter of the window glass 120, and the non-printed area 120b is located in the central area of ​​the window glass 120. The visible light transmittance of the non-printed area 120b is greater than that of the printed area 120a. The non-printed area 120b is mainly used for the field of vision of occupants or sensors observing the external environment, while the printed area 120a is mainly used to shield components inside the vehicle. For example, the visible light transmittance of the non-printed area 120b is greater than or equal to 70%, while the visible light transmittance of the printed area 120a is less than or equal to 5%.

[0033] The vehicle window glass 120 includes a glass substrate 10 and an ink layer 20. The ink layer 20 is disposed on the surface of the glass substrate 10 and is located in the printing area 120a.

[0034] In some embodiments, the vehicle window glass 120 is a single piece of tempered glass, the number of glass substrates 10 is one, the number of ink layers 20 is one, the ink layer 20 is disposed on the surface of the glass substrate 10 facing the inside of the vehicle, the thickness of the glass substrate 10 is between 3 mm and 5 mm, and the thickness of the ink layer 20 is between 15 μm and 30 μm.

[0035] In other embodiments, the window glass 120 is laminated glass, insulated glass, or vacuum glass. There are at least two glass substrates 10 and one or more ink layers 20. The ink layer 20 can be disposed on only one surface of the glass substrate 10, or it can be disposed on the surface of each glass substrate 10. The thickness of each glass substrate 10 is 0.7 mm to 4 mm, and the thickness of the ink layer 20 is 10 μm to 25 μm. Taking the window glass 120 as laminated glass as an example, the laminated glass includes two glass substrates 10, one of which serves as the outer glass plate and the other as the inner glass plate. The ink layer 20 can be disposed only on the surface of the outer glass plate facing the inner glass plate, or it can be disposed simultaneously on both the surface of the outer glass plate facing the inner glass plate and the surface of the inner glass plate facing away from the outer glass plate.

[0036] The laminated glass also includes an adhesive layer disposed between two adjacent glass substrates 10. The adhesive layer material is selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), and ionic polymer (SGP). The insulated glass also includes a hollow layer disposed between two adjacent glass substrates 10 and a fixed spacer frame. The fixed spacer frame supports the two adjacent glass substrates 10 and ensures the hollow layer is sealed. The frame of the fixed spacer frame is circumferentially arranged along the edge of the window glass 120, and the internal space of the fixed spacer frame is a sealed hollow layer. The hollow layer is filled with a dry gas, such as dry air or an inert gas. The vacuum glass also includes a vacuum layer disposed between two adjacent glass substrates 10 and support columns. A sealed space is formed by evacuating the sealed space, and the vacuum layer is formed by evacuating the sealed space. The support columns are located inside the vacuum layer and consist of several columns of equal height, used to support the two adjacent glass substrates 10. The material used for sealing the space can be glass powder or metal. The support column can be made of metal, alloy, inorganic non-metal, or a mixture of metal and inorganic non-metal. The vacuum level of the vacuum layer is less than or equal to 0.1 Pa.

[0037] In this embodiment, the ink layer 20 can be manufactured using a screen printing process. For example, the main components of the ink layer 20 are glass frit, pigments, and pine oil. It should be noted that when designing the position and area of ​​the ink layer 20 within the vehicle window glass 120, the temperature difference between the printed area 120a and the non-printed area 120b of the vehicle window glass 120 under sunlight exposure needs to be comprehensively considered to prevent the vehicle window glass 120 from cracking. Simultaneously, it is also necessary to avoid the ink layer 20 affecting the overall aesthetics of the vehicle window glass 120 and obstructing the driver's view.

[0038] The ink layer 20 includes a black border portion (not shown) and a printed portion (not shown). The black border portion is fixedly connected to the printed portion and surrounds the periphery of the glass substrate 10. It is understood that the vehicle window glass 120 is typically sealed to the vehicle body using sealing strips and sealant. The black border portion can cover the sealing strip, shielding it from direct sunlight and preventing rapid aging, thus delaying the aging of the sealing strip and extending its service life. Simultaneously, the black border portion can also conceal adhesive residue on the vehicle window glass 120, contributing to an improved aesthetic appearance.

[0039] The printed portion surrounds the inner periphery of the black border portion. The printed portion has multiple black dots (not shown). The density of these black dots gradually increases along the direction from the non-printed area 120b to the printed area 120a of the window glass 120. Understandably, when sunlight shines on the window glass 120, the printed area 120a heats up faster than the non-printed area 120b, creating a temperature difference between them. At this time, the multiple black dots in the printed portion can quickly absorb and store the heat from the printed area 120a, then evenly transfer it to the non-printed area 120b. This arrangement can alleviate the stress caused by thermal expansion and contraction in the window glass 120, change the rate of heat transfer within the window glass 120, and make the heating of the window glass 120 gradually more uniform, thereby effectively reducing the risk of the window glass 120 shattering. In addition, the multiple black dots on the printed part can also obscure components such as camera sensors, following radar, sunlight and rain sensors, and ambient light sensors, preventing users from directly observing these components from outside the vehicle, making the vehicle's appearance more beautiful and elegant.

[0040] Embodiments of this application also provide a method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass, used to measure and evaluate the temperature difference between the non-printed area 120b and the printed area 120a of the vehicle window glass 120 under simulated lighting conditions.

[0041] Please refer to the following: Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a transient thermal model 200 provided in an embodiment of this application. Figure 4 This is a schematic flowchart illustrating a method for calculating the temperature difference between the printed area 120a and the non-printed area 120b of a vehicle window glass 120, as provided in an embodiment of this application.

[0042] Step S1: Obtain the performance parameters of the vehicle window glass 120. The vehicle window glass 120 has a printed area 120a and a non-printed area 120b, with the printed area 120a surrounding the non-printed area 120b. The vehicle window glass 120 also includes a glass substrate 10 and an ink layer 20. The ink layer 20 is disposed on the surface of the glass substrate 10 and located in the printed area 120a of the vehicle window glass 120.

[0043] Step S1 above includes: Step S11, obtaining the density, thermal conductivity, and specific heat of the glass substrate 10. For example, the density of the glass substrate 10 can be obtained by gravimetric analysis, and the specific heat of the glass substrate 10 can be obtained by testing it using a differential scanning calorimeter (DSC).

[0044] Step S12: Obtain the density, thermal conductivity and specific heat of ink layer 20.

[0045] Step S2: Obtain the performance parameters of radiation source 210.

[0046] Step S3: Construct a transient thermal model 200 using the performance parameters of the vehicle window glass 120 and the radiation source 210. That is, the transient thermal model 200 includes the radiation source 210, the glass substrate 10, and the ink layer 20.

[0047] The step of constructing a transient thermal model 200 using the performance parameters of the window glass 120 and the radiation source 210 includes: constructing a transient thermal model 200 using the density, thermal conductivity and specific heat of the glass substrate 10, the density, thermal conductivity and specific heat of the ink layer 20, and the performance parameters of the radiation source 210.

[0048] In this embodiment, the radiation source 210 is used to simulate a sunlight source. Preferably, the ratio of the distance between the radiation source 210 and the window glass 120 to the thickness of the window glass 120 is greater than or equal to 200, more preferably greater than or equal to 500, further preferably greater than or equal to 1000, even more preferably greater than or equal to 2000, or even greater than or equal to 4000. For example, if the distance between the radiation source 210 and the window glass 120 is 2 meters and the thickness of the window glass 120 is 3 mm, the ratio is 666.67. Or, for example, if the distance between the radiation source 210 and the window glass 120 is 10 meters and the thickness of the window glass 120 is 4.96 mm, the ratio is 2016.13.

[0049] To better establish a parallel light source, the ratio of the area of ​​the radiating surface of the radiation source 210 to the area of ​​the window glass 120 is preferably greater than or equal to 10, more preferably greater than or equal to 20, more preferably greater than or equal to 50, even greater than or equal to 100, and even more preferably greater than or equal to 200; for example, the area of ​​the radiating surface of the radiation source 210 is 100m². 2 The area of ​​the 120mm car window glass is 1m². 2 The ratio of the two is 100; for example, the radiating surface area of ​​radiation source 210 is 625m². 2 The area of ​​the 120mm car window glass is 1.8m². 2 The ratio of the two is 347.22.

[0050] It should be noted that the thickness of the ink layer 20 is typically equivalent to the thickness of the glass substrate 10 to facilitate model building and mesh generation. In this application, the thickness of the ink layer 20 is magnified by a certain factor. For example, if the thickness of the ink layer 20 is 10 μm to 30 μm, the equivalent thickness after magnification can be 0.5 mm to 1 mm, i.e., the equivalent magnification factor is 15 to 100, more preferably 20 to 50. Simultaneously, parameters such as the density, thermal conductivity, and specific heat of the ink layer 20 also need to be equivalently replaced according to the equivalent magnification factor to ensure that the heat absorption performance of the ink layer 20 is not affected.

[0051] Step S4: Simulate the radiation source 210 to heat the window glass 120 from the outside of the window glass 120, and obtain the temperature field distribution result of the window glass 120. Among them, the radiation source 210 can be used as the internal heat source of the transient thermal model 200, so that the transient thermal model 200 can be treated as a whole to simulate the temperature field distribution of the transient thermal model 200 as a whole under transient heat.

[0052] Step S4 above includes: using finite element software to simulate the heating of the vehicle window glass 120 by the radiation source 210, and obtaining the temperature field distribution results of the vehicle window glass 120. It should be understood that the relevant commands in the toolbar of existing commercial finite element software can only complete the setting of thermal radiation from a geometry to air, and cannot set the thermal radiation between two or more geometries. In this embodiment, before using finite element software to simulate the heating of the vehicle window glass 120 by the radiation source 210, the relevant commands in the toolbar of the finite element software are written through the following five steps to enable the finite element software to set the thermal radiation between two or more geometries, thereby enabling the finite element software to simulate the heating of the vehicle window glass 120 by the radiation source 210. The specific steps are as follows:

[0053] The first step is to define the surface boundary condition parameters, surface emissivity, and number of radiation sources 210. For example, the number of radiation sources 210 is one. In some other embodiments, the number of radiation sources 210 may also be multiple.

[0054] The second step is to define the surface boundary conditions, surface emissivity, and number of glass substrates 10. For example, there is one glass substrate 10. In some other embodiments, there may be multiple glass substrates 10.

[0055] The third step is to define the surface boundary conditions, surface emissivity, and number of ink layers 20. For example, there is one ink layer 20. In some other embodiments, there may be multiple ink layers 20.

[0056] The fourth step is to define the temperature and quantity of the open space containing the radiation source 210 and the vehicle window 120. The open space containing the radiation source 210 and the vehicle window 120 refers to the space formed by the environment surrounding the vehicle window 120 and the radiation source 210. For example, the temperature of the open space containing the radiation source 210 and the vehicle window 120 is 20–25°C, and the quantity of the open space containing the radiation source 210 and the vehicle window 120 is one.

[0057] Fifth step, define the Stefan-Boltzmann constant σ = 5.67 × 10 -8 W / m 2 ·K 4 .

[0058] Step S5: Obtain the temperature of the printed area 120a and the non-printed area 120b of the window glass 120.

[0059] The steps of obtaining the temperature of the printed area and the temperature of the non-printed area include: when the heating time of the simulated heating of the window glass 120 by the radiation source 210 reaches the preset heating time, obtaining the temperature of the printed area 120a and the temperature of the non-printed area 120b.

[0060] In this embodiment, when there are multiple preset heating times, the step of obtaining the temperature of the printing area 120a and the temperature of the non-printing area 120b includes: when the heating time of the radiation source 210 simulating heating of the window glass 120 reaches any preset heating time, obtaining the temperature of the printing area 120a and the temperature of the non-printing area 120b of the window glass 120.

[0061] After obtaining the temperature of the printed area 120a and the non-printed area 120b of the window glass 120, the method for calculating the temperature difference between the printed area 120a and the non-printed area 120b of the window glass 120 further includes: obtaining the temperature change curve of the printed area 120a under multiple preset heating times, and obtaining the temperature change curve of the non-printed area 120b under multiple preset heating times.

[0062] Step S6: Calculate the temperature difference between the printed area 120a and the non-printed area 120b of the window glass 120.

[0063] Please see Figures 5 to 8 , Figures 5 to 6 This is a schematic diagram of the simulation results of the temperature field distribution of the vehicle window glass 120 according to the first embodiment provided in this application. Figures 7 to 8 This is a schematic diagram of the simulation experiment results of the temperature field distribution of the vehicle window glass 120 according to the second embodiment provided in this application.

[0064] The first and second embodiments were heated by a radiation source using finite element method software, and simulation results of the temperature field distribution of the first and second embodiments were obtained. The simulation results of the temperature field distribution of the first embodiment are as follows: Figure 5 and Figure 6 As shown, the simulation results of the temperature field distribution in the second embodiment are as follows: Figure 7 and Figure 8 As shown.

[0065] exist Figure 5 middle, Figure 5 The temperature distribution of the radiation source-facing surface of the vehicle window glass 120 of the first embodiment is shown. The preset heating time is 1000s. The temperature of the printed area 120a is 27.034°C to 27.093°C, and the temperature of the non-printed area 120b is 26.678°C. The temperature of the printed area 120a of the vehicle window glass 120 is higher than the temperature of the non-printed area 120b.

[0066] exist Figure 6 middle, Figure 6 The temperature distribution of the surface of the vehicle window glass 120 facing away from the radiation source is shown in the first embodiment. The preset heating time is 1000s. The temperature of the printed area 120a is 25.461°C to 26.378°C, and the temperature of the non-printed area 120b is 26.414°C. The temperature of the printed area 120a of the vehicle window glass 120 is slightly lower than the temperature of the non-printed area 120b.

[0067] exist Figure 7 middle, Figure 7The temperature distribution of the radiation source-facing surface of the vehicle window glass 120 of the first embodiment is shown. The preset heating time is 1000s. The temperature of the printed area 120a is 39.154°C to 40.396°C, and the temperature of the non-printed area 120b is 36.714°C. The temperature of the printed area 120a of the vehicle window glass 120 is higher than the temperature of the non-printed area 120b.

[0068] exist Figure 8 middle, Figure 8 The temperature distribution of the surface of the vehicle window glass 120 facing away from the radiation source is shown in the first embodiment. The preset heating time is 1000s. The temperature of the printed area 120a is 30.368°C to 30.526°C, and the temperature of the non-printed area 120b is 30.626°C. The temperature of the printed area 120a of the vehicle window glass 120 is slightly lower than the temperature of the non-printed area 120b.

[0069] The results obtained from on-site measurements of the temperature field distribution of the vehicle window glass 120 show that, because the ink layer 20 of the vehicle window glass 120 can absorb heat, on the outside of the vehicle window glass 120, where the radiation source directly irradiates the printed area 120a and the non-printed area 120b, the temperature of the printed area 120a is higher than that of the non-printed area 120b. On the inside of the vehicle window glass 120, the printed area 120a acts as a shielding layer, and its temperature is slightly lower than that of the non-printed area 120b. This indicates that the simulation results are consistent with the results obtained from on-site measurements. Therefore, it can be proven that the method for calculating the temperature difference between the printed area 120a and the non-printed area 120b of the vehicle window glass 120 can be used to calculate this temperature difference under simulated conditions, and the calculation results are reliable.

[0070] In the technical solution provided in this application, based on the finite element method, the radiation source 210 is simulated to radiate heat to the window glass 120 from the outside of the window glass 120. This allows the temperature difference between the non-printed area 120b and the printed area of ​​the window glass 120 to be calculated during the design process of the window glass 120, without having to wait for the actual production and installation of the window glass 120 and then calculate the temperature difference between the printed area 120a and the non-printed area 120b of the window glass 120 through on-site measurement. This helps to reduce the production cost of the window glass 120.

[0071] Furthermore, according to the temperature difference calculation method for the printed area 120a and the non-printed area 120b of the vehicle window glass 120 provided in this application, the calculated temperature difference between the printed area 120a and the non-printed area 120b of the vehicle window glass 120 can be used to adjust the position of the printed area 120a in the vehicle window glass 120 in real time during the design process of the vehicle window glass 120, so as to avoid the temperature difference between the printed area 120a and the non-printed area 120b of the vehicle window glass 120 being too large, thereby preventing the vehicle window glass 120 from cracking due to the excessive temperature difference between the printed area 120a and the non-printed area 120b.

[0072] This application also provides a computer device, including a memory, a processor, and a computer program. The computer program is stored in the memory and can run on the processor. When the computer program is executed by the processor, it implements the above-mentioned method for calculating the temperature difference between the printed area and the non-printed area of ​​the vehicle window glass.

[0073] This application also provides a computer-readable storage medium storing instructions that, when executed on a computer, enable the computer to perform the aforementioned method for calculating the temperature difference between the printed and non-printed areas of a car window.

[0074] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for calculating the temperature difference between the printed and non-printed areas of a vehicle window, characterized in that, include: The performance parameters of a vehicle window glass are obtained. The vehicle window glass has a non-printed area and a printed area surrounding the non-printed area. The vehicle window glass includes a glass substrate and an ink layer. The ink layer is disposed on the surface of the glass substrate and located in the printed area. The density, thermal conductivity and specific heat of the glass substrate are obtained, and the density, thermal conductivity and specific heat of the ink layer are also obtained. Obtain the performance parameters of the radiation source; A transient thermal model is constructed using the performance parameters of the vehicle window glass and the radiation source, wherein the transient thermal model is constructed using the density, thermal conductivity and specific heat of the glass substrate, the density, thermal conductivity and specific heat of the ink layer, and the performance parameters of the radiation source. Define the surface boundary conditions, surface emissivity, and number of radiation sources; Define the surface boundary conditions, surface emissivity, and number of glass substrates; Define the surface boundary conditions, surface emissivity, and number of ink layers; Define the temperature and quantity of the radiation source and the open space in which the vehicle window glass is located; Define the Stefan-Boltzmann constant σ as 5.67 × 10⁻⁶. -8 W / m 2 ·K 4 ; The radiation source is simulated to heat the window glass from the outside, and the temperature field distribution of the window glass is obtained. The finite element method is used to simulate the radiation source heating the window glass to obtain the temperature field distribution of the window glass. The temperature of the printed area and the temperature of the non-printed area are obtained.

2. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to claim 1, characterized in that, The ratio of the distance between the radiation source and the window glass to the length of the window glass is greater than or equal to 200.

3. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to claim 2, characterized in that, The ratio of the area of ​​the radiation source's radiating surface to the area of ​​the vehicle window glass is greater than or equal to 10.

4. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to claim 1, characterized in that, The number of radiation sources is one or more, or the number of glass substrates is one or more, or the number of ink layers is one or more.

5. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to claim 1 or 4, characterized in that, The temperature of the open space where the radiation source and the vehicle window glass are located is 20~25℃.

6. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to any one of claims 1 to 3, characterized in that, The step of obtaining the temperature of the printed area and the temperature of the non-printed area includes: When the heating time of the simulated heating of the car window glass by the radiation source reaches the preset heating time, the temperature of the printed area and the temperature of the non-printed area are obtained.

7. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to claim 6, characterized in that, There are multiple preset heating times. The steps for obtaining the temperature of the printing area and the temperature of the non-printing area include: When the heating time of the radiation source simulating heating of the car window glass reaches any of the preset heating times, the temperature of the printed area and the temperature of the non-printed area are obtained. After obtaining the temperature of the printed area and the temperature of the non-printed area, the method for calculating the temperature difference between the printed area and the non-printed area of ​​the vehicle window glass further includes: Obtain the temperature change curves of the printing area under multiple preset heating times; Obtain the temperature change curves of the non-printing area under multiple preset heating times.

8. The method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass according to any one of claims 1 to 3, characterized in that, After obtaining the temperature of the printed area and the temperature of the non-printed area, the method for calculating the temperature difference between the printed area and the non-printed area of ​​the vehicle window glass further includes: Calculate the temperature difference between the printed area and the non-printed area.

9. A computer device, characterized in that, The system includes a memory, a processor, and a computer program, wherein the computer program is stored in the memory and can run on the processor, and when executed by the processor, the computer program implements a method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a computer, enable the computer to perform a method for calculating the temperature difference between the printed and non-printed areas of a vehicle window glass as described in any one of claims 1 to 8.

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