Air temperature calculation system and method for the space formed by the instrument panel and the windshield

Abstract

The present invention provides an air temperature calculation system and method for the space formed by an instrument panel and a windshield, including: obtaining the heat exchange energy of the instrument panel according to the solar radiation intensity and the heat exchange formula; obtaining the first heat exchange energy of the windshield according to the glass temperature and the first air temperature; obtaining the second heat exchange energy of the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature of the open area; obtaining the input energy of the defrost air outlet according to the second mapping relationship between the mass air volume of the defrost air outlet and the retention coefficient and the third air temperature of the defrost air outlet; and obtaining the fourth air temperature in the current calculation period according to the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy, and the first air temperature. Compared with the prior art, the present invention obtains the air temperature in the narrow space by calculation, replaces the physical sensor, and directly saves the vehicle development cost.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive intelligence, and specifically, to an air temperature calculation system and method for the space formed by an instrument panel and a windshield. Background Art

[0002] In the spatial structure of a passenger vehicle, the air temperature in the narrow space at the instrument panel and the windshield plays an important role in air-conditioning control or function determination related to the air conditioner, such as the automatic defogging function of the windshield. The commonly used method for obtaining the air temperature at this position is to complete it by arranging physical sensors for collection, which will increase the manufacturing cost of the vehicle. In order to reduce the manufacturing cost of the vehicle, the present invention calculates the heat exchange energy between the air in the narrow space and the surrounding environment, and finally calculates the air temperature in the narrow space, thereby reducing the manufacturing cost of the vehicle and improving the efficiency and accuracy of temperature calculation.

[0003] Patent document CN110816475A discloses a vehicle defogging device applied to a vehicle. The vehicle includes a first window, a second window, and an air conditioner. The window defogging device includes: a camera, a first temperature sensor, a second temperature sensor, a humidity sensor, and a processor. The camera is used to obtain the fogging states of the first window and the second window. The first temperature sensor is used to obtain the temperature of the inner surface as the first temperature. The second temperature sensor is used to obtain the temperature of the outer surface as the second temperature. The humidity sensor is used to obtain the surface humidity of the first window and the second window. When the camera obtains that at least one of the first window and the second window is fogged, the processor controls the air outlet of the air conditioner to defog according to the first temperature, the second temperature, and the surface humidity. However, in this method, the temperature is collected by a temperature sensor, and the technical problem of reducing the manufacturing cost of the vehicle is not solved. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an air temperature calculation system and method for the space formed by an instrument panel and a windshield.

[0005] An air temperature calculation system for the space formed by an instrument panel and a windshield according to the present invention includes:

[0006] A heat exchange module: obtaining the heat exchange energy of the instrument panel according to the sunlight intensity and the heat exchange formula;

[0007] A first heat exchange module: obtaining the first heat exchange energy of the windshield according to the glass temperature and the first air temperature, where the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle;

[0008] Second heat exchange module: Obtain the second heat exchange energy of the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature of the open area.

[0009] Energy exchange module: Obtain the input energy of the defrosting air outlet according to the second mapping relationship between the mass air volume of the defrosting air outlet and the retention coefficient and the third air temperature of the defrosting air outlet.

[0010] Energy calculation module: Obtain the fourth air temperature in the current calculation period according to the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy and the first air temperature.

[0011] Preferably, the heat exchange module includes:

[0012] Module M101: Obtain the horizontal incident intensity and the vertical incident intensity according to the sunlight intensity.

[0013] Module M102: Obtain the vertical sunlight energy and the horizontal sunlight energy according to the first spot area in the vertical direction of the instrument panel and the vertical incident intensity, and the second spot area in the horizontal direction of the instrument panel and the horizontal incident intensity.

[0014] Module M103: Obtain the heat exchange energy according to the vertical sunlight energy, the horizontal sunlight energy and the heat exchange formula.

[0015] Preferably, module M103 includes:

[0016] Unit D1031: Obtain the temperature difference of the surface temperature of the instrument panel according to the vertical sunlight energy, the horizontal sunlight energy and the heat exchange formula.

[0017] Unit D1032: Obtain the second surface temperature of the instrument panel according to the temperature difference and the first surface temperature, where the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation period.

[0018] Unit D1033: Obtain the heat exchange energy according to the second surface temperature and the first surface temperature.

[0019] Preferably, the value of the empirical coefficient is from 1 to 1.7.

[0020] Preferably, the retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

[0021] According to an air temperature calculation method for a space formed by an instrument panel and a windshield provided by the present invention, it includes:

[0022] Step 1: Obtain the heat exchange energy of the instrument panel according to the sunlight intensity and the heat exchange formula.

[0023] Step 2: Obtain the first heat exchange energy of the windshield based on the glass temperature and the first air temperature, where the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle;

[0024] Step 3: Obtain the second heat exchange energy of the open space based on the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature in the open area;

[0025] Step 4: Obtain the input energy of the defrost air outlet based on the second mapping relationship between the mass air volume of the defrost air outlet and the retention coefficient and the third air temperature of the defrost air outlet;

[0026] Step 5: Obtain the fourth air temperature in the current calculation cycle based on the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy, and the first air temperature.

[0027] Preferably, Step 1 includes:

[0028] Step 101: Obtain the horizontal incident intensity and the vertical incident intensity based on the solar radiation intensity;

[0029] Step 102: Obtain the vertical solar radiation energy and the horizontal solar radiation energy based on the first spot area in the vertical direction of the instrument panel and the vertical incident intensity, as well as the second spot area in the horizontal direction of the instrument panel and the horizontal incident intensity;

[0030] Step 103: Obtain the heat exchange energy based on the vertical solar radiation energy, the horizontal solar radiation energy, and the heat exchange formula.

[0031] Preferably, Step 103 includes:

[0032] Step 1031: Obtain the temperature difference of the surface temperature of the instrument panel based on the vertical solar radiation energy, the horizontal solar radiation energy, and the heat exchange formula;

[0033] Step 1032: Obtain the second surface temperature of the instrument panel based on the temperature difference and the first surface temperature, where the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation cycle;

[0034] Step 1033: Obtain the heat exchange energy based on the second surface temperature and the first surface temperature.

[0035] Preferably, the value of the empirical coefficient is from 1 to 1.7.

[0036] Preferably, the retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention obtains the air temperature in a narrow space through calculation, replacing physical sensors, which directly saves the vehicle development cost.

[0039] 2. The present invention calculates the heat exchange energy, thereby obtaining calculation results with high precision and real-time data.

[0040] 3. The present invention classifies the factors affecting the glass temperature change by calculating the energy received by the glass from sunlight irradiation and the heat exchange energy on the air side, which is convenient for software developers to adjust software parameters later. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0042] Figure 1 It is a schematic diagram of the space formed by the instrument panel and the windshield of the present invention;

[0043] Figure 2 It is a schematic flow diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The present invention will be described in detail below with reference to 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 those of ordinary skill in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] The present invention provides an air temperature calculation system for the space formed by the instrument panel and the windshield, including the following modules:

[0046] Heat exchange module: Obtain the heat exchange energy of the instrument panel according to the sunlight intensity and the heat exchange formula.

[0047] Among them, the heat exchange module includes: Module M101: Obtain the horizontal incident intensity and the vertical incident intensity according to the sunlight intensity; Module M102: Obtain the vertical sunlight energy and the horizontal sunlight energy according to the first spot area in the vertical direction of the instrument panel and the vertical incident intensity, and the second spot area in the horizontal direction of the instrument panel and the horizontal incident intensity; Module M103: Obtain the heat exchange energy according to the vertical sunlight energy, the horizontal sunlight energy and the heat exchange formula.

[0048] Specifically, module M103 includes: unit D1031: obtaining the temperature difference of the instrument panel surface based on the vertical sunlight energy, horizontal sunlight energy, and heat transfer formula; unit D1032: obtaining the second surface temperature of the instrument panel based on the temperature difference and the first surface temperature, where the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation cycle; unit D1033: obtaining the heat transfer energy based on the second surface temperature and the first surface temperature.

[0049] In an alternative embodiment, the real-time sunlight intensity (Is) is obtained and decomposed into the horizontal incident intensity (Ish) and the vertical incident intensity (Isv) along the horizontal and vertical directions; through the vehicle structure parameters, the spot area (Sh) of sunlight on the instrument panel in the vertical direction and the spot area (Sv) in the horizontal direction are calculated; the horizontal sunlight energy (Qsh) of the instrument panel in the horizontal direction is calculated by formula (1), and the vertical sunlight energy (Qsv) of the instrument panel in the vertical direction is calculated by formula (2).

[0050] Qsh = Ish × windshield transmittance × refractive index of the glass in the horizontal direction × Sh; (1)

[0051] Qsv = Isv × windshield transmittance × refractive index of the glass in the vertical direction × Sv; (2)

[0052] Furthermore, the temperature difference (ΔTy) of the instrument panel surface is calculated using the heat transfer formula, and the heat transfer formula here can be expressed by formula (3).

[0053] ΔTy = (Qsv + Qsh) ÷ (Cy × My); (3)

[0054] Wherein, Cy represents the specific heat capacity of the instrument panel surface material; My represents the mass of the instrument panel surface layer.

[0055] Meanwhile, the second surface temperature (Ty) of the instrument panel is obtained using the formula Ty = Ty’ + ΔTy. Wherein, Ty’ represents the surface temperature of the instrument panel calculated in the previous calculation cycle, that is, the first surface temperature.

[0056] Furthermore, using the heat transfer formula, the heat transfer energy (Q1) between the instrument panel and the air in the narrow space is obtained, Q1 = (T’ - Ty) × total area of the instrument panel × heat transfer coefficient of the instrument panel, where T’ represents the air temperature in the narrow space obtained in the previous calculation cycle, that is, the first air temperature.

[0057] The first heat exchange module: obtaining the first heat exchange energy of the windshield based on the glass temperature and the first air temperature, where the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle.

[0058] Specifically, the heat exchange between the windshield and the outside world is mainly completed through the heat exchange between the air in the narrow space and the windshield. Therefore, as long as the heat exchange energy between the air and the windshield is calculated, the first heat exchange energy (Q2) can be obtained. Q2 = (glass temperature – T') × glass area × windshield heat transfer coefficient, where T' represents the air temperature in the narrow space calculated in the previous calculation cycle, that is, the first air temperature.

[0059] The second heat exchange module: Obtain the second heat exchange energy in the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature in the open area.

[0060] Among them, the value of the empirical coefficient ranges from 1 to 1.7.

[0061] Specifically, since the energy exchange between the air in the narrow space and the open space inside the vehicle can be attributed to heat exchange and convection. For the convenience of engineering application, the energy exchange of convection is incorporated into the heat exchange energy and corrected by an engineering empirical coefficient A related to the air volume of the air outlet of the air conditioner. Table 1 shows the first mapping relationship between the air volume of the air outlet of the air conditioner and the engineering empirical coefficient (A). As shown in Table 1, the value range of A is between 1 and 1.7.

[0062] Table 1

[0063] Air volume (kg / h) 0 50 100 200 300 Coefficient A 0 1.2 1.3 1.4 1.7

[0064] Furthermore, complete the calculation of the heat exchange energy Q3 between the air in the narrow space and the air in the open space. Q3 = (air temperature in the open area – T') × adjacent area of the region × air heat transfer coefficient × A, where the adjacent area of the region is the area of the adjacent interface between the narrow space and the open area, which is related to the internal structure of the vehicle.

[0065] The energy exchange module: Obtain the input energy of the defrost air outlet according to the second mapping relationship between the mass air volume of the defrost air outlet and the retention coefficient and the third air temperature of the defrost air outlet.

[0066] Among them, the retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

[0067] Specifically, during the general vehicle design, the air defrost outlet of the air conditioner is arranged on the instrument panel near the glass side. Therefore, when the air defrost outlet blows air, it will have a certain impact on the air temperature in the narrow space. Therefore, it is necessary to consider the influence of the air volume sent out by the outlet on the temperature of this area. Since the energy sent out by the air defrost outlet is not completely exchanged with the air in the narrow space, a part of it is directly transferred to the open space. Therefore, a retention coefficient (B) related to the mass air volume (Maf) of the air defrost outlet within a calculation cycle is used. B represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange. Table 2 shows the second mapping relationship between the mass air volume and the retention coefficient of the air defrost outlet of the present invention. According to Table 2, the mass air volume (Maf) of the air defrost outlet within a calculation cycle can be obtained.

[0068] Table 2

[0069] Air volume (kg / h) 0 50 100 200 300 B 1 0.97 0.91 0.89 0.85

[0070] Furthermore, the input energy (Q4) of the air defrost outlet of the air conditioner is obtained using formula (4).

[0071] Q4 = (Taf – T’) × Maf × Caf × B; (4)

[0072] Wherein, Taf represents the air temperature sent out by the air defrost outlet; Caf represents the specific heat capacity of the air sent out by the air defrost outlet.

[0073] Energy calculation module: Based on the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy, and the first air temperature, the fourth air temperature within the current calculation cycle is obtained.

[0074] Figure 1 is a schematic diagram of the space formed by the instrument panel and the windshield of the present invention. As Figure 1 shown, the space formed by the instrument panel and the windshield is a narrow space. The air temperature in the narrow space is related to the heat exchange energy Q1 between the instrument panel and the air in the narrow space, the first heat exchange energy Q2 between the air in the narrow space and the windshield and the outside, the second heat exchange energy between the air in the narrow space and the open space, and the input energy Q4 of the air defrost outlet of the air conditioner. The total energy (Q) of the air in the narrow space within the current calculation cycle is the sum of Q1, Q2, Q3, and Q4, that is, Q = Q1 + Q2 + Q3 + Q4. The volume of the narrow space can be calculated using the structural characteristics of the whole vehicle, and the mass of the air in the narrow space M can be calculated. Using the heat exchange formula: ΔT = Q ÷ (C × M), where C represents the specific heat capacity of the air, the air temperature rise (ΔT) in the narrow space within the current calculation cycle is calculated, and then the fourth air temperature (T) in the narrow space within the current calculation cycle is calculated using the formula T = T’ + ΔT.

[0075] After the current calculation cycle is completed in the present invention, wait to enter the next calculation cycle, and obtain the air temperature in the narrow space of the next calculation cycle through calculation. Thus, the real-time air temperature in the narrow space is obtained.

[0076] Figure 2 For the process schematic diagram of the present invention, as Figure 2 shown, the present invention also provides a method for calculating the air temperature in the space formed by the instrument panel and the windshield, including the following steps:

[0077] Step 1: Obtain the heat exchange energy of the instrument panel according to the solar radiation intensity and the heat exchange formula.

[0078] Among them, Step 1 includes: Step 101: Obtain the horizontal incident intensity and the vertical incident intensity according to the solar radiation intensity; Step 102: Obtain the vertical solar radiation energy and the horizontal solar radiation energy according to the first spot area in the vertical direction of the instrument panel and the vertical incident intensity, and the second spot area in the horizontal direction of the instrument panel and the horizontal incident intensity; Step 103: Obtain the heat exchange energy according to the vertical solar radiation energy, the horizontal solar radiation energy and the heat exchange formula.

[0079] In an optional implementation manner, Step 103 includes: Step 1031: Obtain the temperature difference of the surface temperature of the instrument panel according to the vertical solar radiation energy, the horizontal solar radiation energy and the heat exchange formula; Step 1032: Obtain the second surface temperature of the instrument panel according to the temperature difference and the first surface temperature, and the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation cycle; Step 1033: Obtain the heat exchange energy according to the second surface temperature and the first surface temperature.

[0080] Step 2: Obtain the first heat exchange energy of the windshield according to the glass temperature and the first air temperature, and the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle.

[0081] Step 3: Obtain the second heat exchange energy of the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature in the open area.

[0082] Among them, the value of the empirical coefficient is from 1 to 1.7.

[0083] Step 4: Obtain the input energy of the defrost air outlet according to the second mapping relationship between the mass air volume of the defrost air outlet and the retention coefficient and the third air temperature of the defrost air outlet.

[0084] Among them, the retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

[0085] Step 5: Obtain the fourth air temperature within the current calculation period based on the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy, and the first air temperature.

[0086] 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, embedded microcontrollers, etc. to achieve the same functions. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a kind of hardware component, and the devices, modules, and units included therein for implementing various functions can also be regarded as the structures within the hardware component; the devices, modules, and units for implementing various functions can also be regarded as either software modules for implementing the method or structures within the hardware component.

[0087] 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 combined with each other arbitrarily.

Claims

1. An air temperature calculation system for the space formed by an instrument panel and a windshield, characterized in that, it includes: Heat exchange module: Obtain the heat exchange energy of the instrument panel according to the sunlight intensity and the heat exchange formula; First heat exchange module: Obtain the first heat exchange energy of the windshield according to the glass temperature and the first air temperature, where the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle; Second heat exchange module: Obtain the second heat exchange energy of the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature of the open space; Energy exchange module: Obtain the input energy of the defrost air outlet according to the second mapping relationship between the mass air volume of the defrost air outlet and the retention coefficient and the third air temperature of the defrost air outlet; Energy calculation module: Obtain the fourth air temperature in the current calculation cycle according to the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy and the first air temperature; The space formed by the instrument panel and the windshield is a narrow space; The retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

2. The air temperature calculation system for the space formed by the instrument panel and the windshield according to claim 1, characterized in that, the heat exchange module includes: Module M101: Obtain the horizontal incident intensity and the vertical incident intensity according to the sunlight intensity; Module M102: Obtain the vertical sunlight energy and the horizontal sunlight energy according to the first light spot area in the vertical direction of the instrument panel and the vertical incident intensity, and the second light spot area in the horizontal direction of the instrument panel and the horizontal incident intensity; Module M103: Obtain the heat exchange energy according to the vertical sunlight energy, the horizontal sunlight energy and the heat exchange formula.

3. The air temperature calculation system for the space formed by the instrument panel and the windshield according to claim 2, characterized in that, the module M103 includes: Unit D1031: Obtain the temperature difference of the surface temperature of the instrument panel according to the vertical sunlight energy, the horizontal sunlight energy and the heat exchange formula; Unit D1032: Obtain the second surface temperature of the instrument panel according to the temperature difference and the first surface temperature, where the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation cycle; Unit D1033: Obtain the heat exchange energy according to the second surface temperature and the first air temperature.

4. The air temperature calculation system for the space formed by the instrument panel and the windshield according to claim 1, characterized in that, the value of the empirical coefficient is from 1 to 1.

7.

5. An air temperature calculation method for the space formed by an instrument panel and a windshield, characterized in that, it includes: Step 1: Obtain the heat exchange energy of the instrument panel according to the sunlight intensity and the heat exchange formula; Step 2: Obtain the first heat exchange energy of the windshield according to the glass temperature and the first air temperature, where the first air temperature represents the air temperature in the narrow space obtained in the previous calculation cycle; Step 3: Obtain the second heat exchange energy of the open space according to the first mapping relationship between the air volume of the air outlet of the air conditioner and the empirical coefficient and the second air temperature of the open space; Step 4: Obtain the input energy of the defrosting air outlet according to the second mapping relationship between the mass air volume of the defrosting air outlet and the retention coefficient and the third air temperature of the defrosting air outlet; Step 5: Obtain the fourth air temperature in the current calculation period according to the heat exchange energy, the first heat exchange energy, the second heat exchange energy, the input energy, and the first air temperature; The space formed by the instrument panel and the windshield is a narrow space; The retention coefficient represents the ratio of the energy in the case of insufficient heat exchange in the narrow space to the energy in the case of sufficient heat exchange.

6. The method for calculating the air temperature of the space formed by the instrument panel and the windshield according to claim 5, wherein, the said Step 1 includes: Step 101: Obtain the horizontal incident intensity and the vertical incident intensity according to the solar radiation intensity; Step 102: Obtain the vertical solar radiation energy and the horizontal solar radiation energy according to the first spot area in the vertical direction of the instrument panel and the vertical incident intensity, and the second spot area in the horizontal direction of the instrument panel and the horizontal incident intensity; Step 103: Obtain the heat exchange energy according to the vertical solar radiation energy, the horizontal solar radiation energy, and the heat exchange formula.

7. The method for calculating the air temperature of the space formed by the instrument panel and the windshield according to claim 6, wherein, the said Step 103 includes: Step 1031: Obtain the temperature difference of the surface temperature of the instrument panel according to the vertical solar radiation energy, the horizontal solar radiation energy, and the heat exchange formula; Step 1032: Obtain the second surface temperature of the instrument panel according to the temperature difference and the first surface temperature, and the first surface temperature is the surface temperature of the instrument panel obtained in the previous calculation period; Step 1033: Obtain the heat exchange energy according to the second surface temperature and the first air temperature.

8. The method for calculating the air temperature of the space formed by the instrument panel and the windshield according to claim 5, wherein, the value of the empirical coefficient is from 1 to 1.7.

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