Vehicle Glass Temperature Calculation System and Method

Abstract

The present invention provides a vehicle glass temperature calculation system and method, including: obtaining the first solar energy on the vehicle glass surface according to the acquired solar radiation intensity and retention rate; obtaining the first heat exchange energy between the vehicle glass and the outside air according to the outside ambient temperature and the first glass temperature; obtaining the second heat exchange energy between the vehicle glass and the inside air according to the inside ambient temperature and the first glass temperature; and obtaining the second glass temperature of the current calculation period through a heat transfer formula based on the first solar energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature. Compared with the prior art, the temperature calculation of the glass in the present invention is related to the energy exchange amount between the glass and the environment. By calculating the energy exchange amount per unit time and using the heat transfer formula to complete the calculation of the glass temperature difference per unit time, and obtaining the current glass temperature by adding the temperature difference to the previous temperature, the effects of improving the operation efficiency and accuracy are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive intelligence, and in particular, to a vehicle glass temperature calculation system and method. Background Art

[0002] The known method for calculating the glass temperature uses the temperature difference between the in-vehicle air temperature and the out-vehicle temperature, and a proportional coefficient to estimate the glass temperature. This calculation method does not take into account the influence of sunlight and vehicle speed on the glass temperature, thus affecting the accuracy of the glass temperature calculation.

[0003] Patent document CN111231609B discloses an in-vehicle temperature detection method, including: obtaining the in-vehicle detected temperature, which includes the temperature inside the instrument panel and the temperature outside the instrument panel; obtaining the parking time; obtaining the opening state of the door and window devices; obtaining the in-vehicle temperature change rate; obtaining the sunlight radiation level and calculating the sunlight radiation deviation value according to the sunlight radiation level; using a reference model to calculate the in-vehicle reference temperature according to the temperature inside the instrument panel, the temperature outside the instrument panel, the temperature change rate inside the instrument panel, the temperature change rate outside the instrument panel, and calibration parameters; using a correction model to perform initial temperature correction, opening state correction, and sunlight radiation correction on the basis of the in-vehicle reference temperature calculated by the reference model, and calculating the in-vehicle corrected temperature; outputting the in-vehicle corrected temperature as the final in-vehicle temperature. The present invention comprehensively considers the actual factors affecting the in-vehicle temperature such as parking time, sunlight irradiation, and door and window opening, and corrects the detected in-vehicle temperature. However, this method does not solve the technical problem of how to accurately calculate the glass temperature. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a vehicle glass temperature calculation system and method.

[0005] According to a vehicle glass temperature calculation system provided by the present invention, it includes:

[0006] The first energy detection module: obtaining the first sunlight energy on the vehicle glass surface according to the obtained sunlight intensity and retention rate;

[0007] The second energy detection module: obtaining the first heat exchange energy between the vehicle glass and the out-vehicle air according to the out-vehicle environmental temperature and the first glass temperature;

[0008] The third energy detection module: obtaining the second heat exchange energy between the vehicle glass and the in-vehicle air according to the in-vehicle environmental temperature and the first glass temperature;

[0009] Fourth energy detection module: Based on the first sunlight energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature, the second glass temperature of the current calculation period is obtained through the heat exchange formula. The first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature.

[0010] Preferably, the retention rate is calculated based on the running speed of the vehicle.

[0011] Preferably, where v represents the running speed of the vehicle.

[0012] Preferably, the first energy detection module includes:

[0013] Module M101: Based on the horizontal incident intensity and vertical incident intensity of the sunlight intensity, the second sunlight energy in the horizontal direction and the third sunlight energy in the vertical direction of the vehicle glass are obtained respectively;

[0014] Module M102: Based on the second sunlight energy and the third sunlight energy, the fourth sunlight energy retained in the horizontal direction of the vehicle glass and the fifth sunlight energy in the vertical direction are obtained;

[0015] Module M103: Based on the fourth sunlight energy, the fifth sunlight energy, and the retention rate, the first sunlight energy is obtained.

[0016] Preferably, Module 102 includes:

[0017] Unit D1021: Based on the second sunlight energy, the refractive index and transmittance of the vehicle glass in the horizontal direction, the fourth sunlight energy is obtained;

[0018] Unit D1022: Based on the third sunlight energy, the refractive index and transmittance of the vehicle glass in the vertical direction, the fifth sunlight energy is obtained.

[0019] A method for calculating the temperature of a vehicle glass provided by the present invention includes:

[0020] Step 1: Based on the obtained sunlight intensity and retention rate, the first sunlight energy on the surface of the vehicle glass is obtained;

[0021] Step 2: Based on the outside vehicle environment temperature and the first glass temperature, the first heat exchange energy between the vehicle glass and the outside air is obtained;

[0022] Step 3: Based on the inside vehicle environment temperature and the first glass temperature, the second heat exchange energy between the vehicle glass and the inside air is obtained;

[0023] Step 4: Obtain the second glass temperature for the current calculation period through the heat exchange formula based on the first sunlight energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature. The first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature.

[0024] Preferably, the retention rate is calculated based on the running speed of the vehicle.

[0025] Preferably, where v represents the running speed of the vehicle.

[0026] Preferably, Step 1 includes:

[0027] Step 101: Obtain the second sunlight energy of the vehicle glass in the horizontal direction and the third sunlight energy in the vertical direction respectively according to the horizontal incident intensity and the vertical incident intensity of the sunlight intensity;

[0028] Step 102: Obtain the fourth sunlight energy retained in the horizontal direction of the vehicle glass and the fifth sunlight energy in the vertical direction according to the second sunlight energy and the third sunlight energy;

[0029] Step 103: Obtain the first sunlight energy according to the fourth sunlight energy, the fifth sunlight energy, and the retention rate.

[0030] Preferably, Step 102 includes:

[0031] Step 1021: Obtain the fourth sunlight energy according to the second sunlight energy and the refractive index and transmittance of the vehicle glass in the horizontal direction;

[0032] Step 1022: Obtain the fifth sunlight energy according to the third sunlight energy and the refractive index and transmittance of the vehicle glass in the vertical direction.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. In the present invention, the temperature calculation of the glass is related to the energy exchange amount between the glass and the environment. By calculating the energy exchange amount per unit time and using the heat exchange formula to complete the calculation of the glass temperature difference per unit time, the current glass temperature is obtained by adding the temperature difference to the previous temperature, achieving a relatively high calculation accuracy and the effect of real-time temperature acquisition.

[0035] 2. The present invention calculates the glass temperature difference through the thermodynamic formula, achieving the purpose of simplifying the calculation, can quickly calculate the temperature of the vehicle glass, improves the calculation speed, and occupies less resources when the software developed by this method runs on an embedded system or an arithmetic chip.

[0036] 3. By calculating the energy received by the glass from sunlight and the heat exchange energy on the air side, the present invention classifies the factors affecting the temperature change of the glass, facilitating the adjustment of software parameters by software developers in the future.

[0037] 4. The present invention calculates the energy received by the glass from sunlight through an empirical formula, simplifies the energy calculation process, and further improves the running speed of the developed software.

[0038] 5. Through an exponential function and related empirical formulas, the present invention calculates the retention rate of the energy received from sunlight, simplifies the calculation process of the energy received from sunlight, reflects the influence of the vehicle's running speed on the calculation process, and provides the calculation accuracy of the glass temperature. At the same time, it simplifies the adaptation process for different vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non - restrictive embodiments with reference to the accompanying drawings:

[0040] Figure 1 It is a schematic diagram of the energy obtained by the glass of the present invention from the environment;

[0041] Figure 2 It is a schematic flowchart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0042] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all fall within the protection scope of the present invention.

[0043] The technical concept of the present invention is to calculate the total energy obtained from the environment within a unit calculation period, use the energy balance formula to calculate the temperature difference of the temperature change of the glass, and calculate the glass temperature using the temperature difference.

[0044] The present invention provides a vehicle glass temperature calculation system, including the following modules:

[0045] The first energy detection module: Obtain the first sunlight energy on the surface of the vehicle glass according to the obtained sunlight intensity and retention rate.

[0046] In the present invention, the retention rate is calculated through the running speed of the vehicle. Specifically, where v represents the running speed of the vehicle.

[0047] Among them, the first energy detection module includes: Module M101: Obtain the second sunlight energy in the horizontal direction and the third sunlight energy in the vertical direction of the vehicle glass respectively according to the horizontal incident intensity and the vertical incident intensity of the sunlight intensity; Module M102: Obtain the fourth sunlight energy remaining in the horizontal direction of the vehicle glass and the fifth sunlight energy remaining in the vertical direction according to the second sunlight energy and the third sunlight energy; Module M103: Obtain the first sunlight energy according to the fourth sunlight energy, the fifth sunlight energy and the retention rate.

[0048] In an alternative implementation manner, Module 102 includes: Unit D1021: Obtain the fourth sunlight energy according to the second sunlight energy and the refractive index and transmittance of the vehicle glass in the horizontal direction; Unit D1022: Obtain the fifth sunlight energy according to the third sunlight energy and the refractive index and transmittance of the vehicle glass in the vertical direction.

[0049] In the present invention, there is no limitation on the vehicle glass. Exemplarily, it can be a windshield.

[0050] The following takes the windshield as an example for a detailed description.

[0051] First, obtain the real-time sunlight intensity (Is), and decompose Is into the horizontal incident intensity (Ish) and the vertical incident intensity (Isv) along the horizontal direction and the vertical direction. Ish multiplied by the horizontal projected area (Sh) of the windshield obtains the second sunlight energy (Qsh’) in the horizontal direction of the glass, Qsh’ = Ish × Sh. Isv multiplied by the vertical projected area (Sv) of the windshield obtains the third sunlight energy (Qsv’) in the vertical direction of the glass, Qsv’ = Isv × Sv. Part of Qsv’ and Qsh’ is reflected, and part passes through the glass and enters the vehicle interior. Therefore, the fourth sunlight energy (Qsh) remaining in the horizontal direction in the glass and the fifth sunlight energy (Qsv) remaining in the vertical direction in the glass are obtained through formula (1) and formula (2) respectively.

[0052] Qsh = Qsh’ * ((100% - horizontal refractive index) * horizontal transmittance); (1)

[0053] Qsv = Qsv’ * ((100% - vertical refractive index) * vertical transmittance); (2)

[0054] Since the sunlight energy remaining on the glass surface will exchange heat with the air as the vehicle speed changes, it is necessary to consider the retention rate of the sunlight energy at different driving speeds of the vehicle. The value of the retention rate ranges between 0 and 1.

[0055] Then the first sunlight energy Qs remaining on the vehicle glass surface can be expressed as formula (3):

[0056] Qs = (Qsh + Qsv) × retention rate; (3)

[0057] It can be known that when the driving speed of the vehicle changes or the intensity of sunlight changes, through the above calculation method, the first solar radiation energy obtained on the vehicle glass surface within this calculation period can be obtained in real time.

[0058] In the present invention, for the convenience of calculation, this period is defined as 1 second. The calculation periods mentioned later can all be set to 1 second, or can be set according to specific situations, without limitation in the invention.

[0059] The second energy detection module: Obtain the first heat exchange energy between the vehicle glass and the outside air according to the outside ambient temperature and the first glass temperature.

[0060] Specifically, first calculate the mass M of the glass, M = glass area * glass thickness * glass density.

[0061] Since there is heat exchange between the glass and the outside air, use the heat exchange formula to calculate the first heat exchange energy Q2 of the heat exchange between the glass and the outside air. Q2 = (Tamb – Tw’) × Sw × glass heat transfer coefficient, where Tamb represents the outside ambient temperature, Tw’ represents the first glass temperature calculated in the previous calculation period, and Sw represents the area of the glass; after calculation, the first heat exchange energy Q2 between the glass and the outside air within the current calculation period can be obtained.

[0062] The third energy detection module: Obtain the second heat exchange energy between the vehicle glass and the inside air according to the inside ambient temperature and the first glass temperature.

[0063] Specifically, since there is heat exchange between the glass and the inside air, use the heat exchange formula to calculate the second heat exchange energy Q1 of the heat exchange between the glass and the inside air, Q1 = (Tin – Tw’) × Sw × glass heat transfer coefficient, where Tin represents the inside ambient temperature, Tw’ represents the first glass temperature calculated in the previous calculation period, and Sw represents the area of the glass. After calculation, the second heat exchange energy between the vehicle glass and the inside air within the current calculation period can be obtained.

[0064] In an alternative embodiment, if more accurate calculation results are required, the air temperature in the triangular space formed by the glass and the dashboard can be used to replace the inside ambient temperature Tin.

[0065] The fourth energy detection module: Obtain the second glass temperature of the current calculation period through the heat exchange formula according to the first solar radiation energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature. The first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature.

[0066] Figure 1 Schematic diagram of the energy obtained by the glass of the present invention from the environment, as Figure 1 shown, the energy Q exchanged between the glass and the environment is composed of the first sunlight energy Qs delivered to the glass by sunlight, the second heat exchange energy Q1 between the glass and the air inside the vehicle, and the first heat exchange energy Q2 between the glass and the air outside the vehicle, that is, Q = Qs + Q1 + Q2.

[0067] Furthermore, the temperature rise (ΔT) of the glass surface in the current calculation period is calculated using the heat exchange formula, and adding the first glass temperature Tw’ calculated in the previous calculation period, the second glass temperature (Tw) at the current moment is obtained.

[0068] Specifically, the heat exchange formula is as shown in formula (4):

[0069] ΔT = (Qs + Q1 + Q2) / (C × M); (4)

[0070] where C represents the specific heat capacity of the glass; M represents the total mass of the glass; ΔT represents the temperature difference between the front and back moments of the glass surface.

[0071] At the same time, using Tw = Tw’ + ΔT, the second glass temperature within this calculation period is obtained.

[0072] Figure 2 Schematic diagram of the process of the present invention, as Figure 2 shown, the present invention also provides a method for calculating the temperature of vehicle glass, including the following steps:

[0073] Step 1: Obtain the first sunlight energy on the surface of the vehicle glass according to the obtained sunlight intensity and retention rate. In the present invention, the retention rate is calculated through the running speed of the vehicle. Specifically, where v represents the running speed of the vehicle.

[0074] Among them, step 1 includes: step 101: Obtain the second sunlight energy in the horizontal direction and the third sunlight energy in the vertical direction of the vehicle glass respectively according to the horizontal incident intensity and vertical incident intensity of the sunlight intensity; step 102: Obtain the fourth sunlight energy retained in the horizontal direction and the fifth sunlight energy retained in the vertical direction of the vehicle glass according to the second sunlight energy and the third sunlight energy; step 103: Obtain the first sunlight energy according to the fourth sunlight energy, the fifth sunlight energy and the retention rate.

[0075] In an optional implementation manner, step 102 includes: step 1021: Obtain the fourth sunlight energy according to the second sunlight energy and the refractive index and transmittance of the vehicle glass in the horizontal direction; step 1022: Obtain the fifth sunlight energy according to the third sunlight energy and the refractive index and transmittance of the vehicle glass in the vertical direction.

[0076] Step 2: Obtain the first heat exchange energy between the vehicle glass and the outside air according to the outside environmental temperature and the first glass temperature.

[0077] Step 3: Obtain the second heat exchange energy between the vehicle glass and the inside air according to the inside environmental temperature and the first glass temperature.

[0078] Step 4: According to the first solar energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature, obtain the second glass temperature of the current calculation period through the heat exchange formula, where the first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature.

[0079] The present invention calculates the total energy obtained from the environment within a unit calculation period, calculates the temperature difference change of the glass using the energy balance formula, and calculates the glass temperature using the temperature difference.

[0080] Those skilled in the art know that in addition to implementing the system and its various devices, modules, and units provided by the present invention in the form of pure computer-readable program code, the method steps can be logically programmed to enable the system and its various devices, modules, and units provided by the present invention to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc. to achieve the same function. Therefore, the system and its various devices, modules, and units provided by the present invention can be regarded as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be regarded as the structure within the hardware component; the devices, modules, and units for implementing various functions can also be regarded as both software modules for implementing the method and the structure within the hardware component.

[0081] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A vehicle glass temperature calculation system, characterized in that, Including: The first energy detection module: obtaining the first solar energy on the vehicle glass surface according to the acquired sunlight intensity and retention rate; The second energy detection module: obtaining the first heat exchange energy between the vehicle glass and the outside air according to the outside ambient temperature and the first glass temperature; The third energy detection module: obtaining the second heat exchange energy between the vehicle glass and the inside air according to the inside ambient temperature and the first glass temperature; The fourth energy detection module: obtaining the second glass temperature of the current calculation period through a heat exchange formula according to the first solar energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature, where the first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature; The retention rate is calculated according to the running speed of the vehicle; The retention rate = , where represents the running speed of the vehicle; The first energy detection module includes: Module M101: respectively obtaining the second solar energy in the horizontal direction and the third solar energy in the vertical direction of the vehicle glass according to the horizontal incident intensity and the vertical incident intensity of the sunlight intensity; Module M102: obtaining the fourth solar energy retained in the horizontal direction of the vehicle glass and the fifth solar energy retained in the vertical direction according to the second solar energy and the third solar energy; Module M103: obtaining the first solar energy according to the fourth solar energy, the fifth solar energy, and the retention rate; Qsh = Qsh’ * ((100% - horizontal refractive index) * horizontal transmittance); Qsv = Qsv’ * ((100% - vertical refractive index) * vertical transmittance); Wherein, Qsh’ represents the second solar energy, Qsv’ represents the third solar energy, Qsh represents the fourth solar energy, and Qsv represents the fifth solar energy; The first solar energy Qs is expressed as Qs = (Qsh + Qsv) × retention rate.

2. The vehicle glass temperature calculation system according to claim 1, wherein, The module M102 includes: Unit D1021: obtaining the fourth solar energy according to the second solar energy and the refractive index and transmittance of the vehicle glass in the horizontal direction; Unit D1022: obtaining the fifth solar energy according to the third solar energy and the refractive index and transmittance of the vehicle glass in the vertical direction.

3. A method for calculating the temperature of vehicle glass, characterized in that, Including: Step 1: obtaining the first solar energy on the vehicle glass surface according to the acquired sunlight intensity and retention rate; Step 2: obtaining the first heat exchange energy between the vehicle glass and the outside air according to the outside ambient temperature and the first glass temperature; Step 3: obtaining the second heat exchange energy between the vehicle glass and the inside air according to the inside ambient temperature and the first glass temperature; Step 4: obtaining the second glass temperature of the current calculation period through a heat exchange formula according to the first solar energy, the first heat exchange energy, the second heat exchange energy, and the first glass temperature, where the first glass temperature is the glass temperature obtained in the previous calculation period of the second glass temperature; The retention rate is calculated according to the running speed of the vehicle; The retention rate = , where represents the running speed of the vehicle; The step 1 includes: Step 101: Obtain the second solar energy in the horizontal direction and the third solar energy in the vertical direction of the vehicle glass respectively according to the horizontal incident intensity and the vertical incident intensity of the solar radiation intensity; Step 102: Obtain the fourth solar energy remaining in the horizontal direction and the fifth solar energy remaining in the vertical direction of the vehicle glass according to the second solar energy and the third solar energy; Step 103: Obtain the first solar energy according to the fourth solar energy, the fifth solar energy and the retention rate; Qsh = Qsh’ * ((100% - horizontal refractive index) * horizontal transmittance); Qsv = Qsv’ * ((100% - vertical refractive index) * vertical transmittance); wherein, Qsh’ represents the second solar energy, Qsv’ represents the third solar energy, Qsh represents the fourth solar energy, and Qsv represents the fifth solar energy; The first solar energy Qs is expressed as Qs = (Qsh + Qsv) × retention rate.

4. The vehicle glass temperature calculation method according to claim 3, characterized in that, The said Step 102 includes: Step 1021: Obtain the fourth solar energy according to the second solar energy and the refractive index and transmittance of the vehicle glass in the horizontal direction; Step 1022: Obtain the fifth solar energy according to the third solar energy and the refractive index and transmittance of the vehicle glass in the vertical direction.

Images