Automobile cabin air conditioner air supply method based on sun angle tracking
By dynamically optimizing the air supply direction of the car air conditioner and adjusting the air supply direction according to the sun's angle, the problems of low air supply efficiency and uneven hot and cold in the existing technology are solved, and riding comfort is improved and technical support is provided for the intelligent design of the air conditioner system.
Patent Information
- Application Number
- CN202510593541.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2025-06-17
AI Technical Summary
The existing automobile air conditioning air supply system cannot dynamically adjust the air supply direction according to changes in the sun's position, resulting in low air supply efficiency and uneven hot and cold, affecting riding comfort.
By defining the sun's angle (sun height angle and solar azimuth angle), extracting the characteristic points of the sun's irradiation range and the characteristic points of the human body, establishing the equation of the air supply angle to the sun's angle, and dynamically optimizing the air supply direction.
It realizes real-time adjustment of the air supply direction according to the sun's angle, improves the thermal comfort in the car, and enhances the intelligent design capabilities of the car's air conditioning system.
Smart Images
Figure CN120156256A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of vehicle air conditioners, and particularly relates to an air supply method for a vehicle cockpit air conditioner based on solar angle tracking. Background Art
[0002] With the development of the automotive industry, occupant thermal comfort has become one of the key issues of concern to users. In summer or high-temperature environments, solar radiation directly irradiates different parts of the occupant's body (such as the head, shoulders, arms, etc.) through the vehicle window, resulting in a local temperature increase and affecting the riding comfort. Traditional automotive air conditioning air supply systems usually adopt a fixed air supply angle or a manual adjustment mode, and cannot dynamically adjust the air supply direction according to the change of the sun's position, resulting in low air supply efficiency, uneven heating and cooling, and even discomfort caused by direct cold air blowing.
[0003] Currently, there is a lack of an intelligent control method in the prior art that can track the solar angle in real time and dynamically optimize the air supply direction. Especially under different vehicle models, different solar altitude angles and azimuth angles, how to accurately analyze the irradiation range of solar radiation on the human body and formulate an optimal air supply strategy based on this is still a technical problem to be solved urgently. Therefore, it is necessary to develop a solar angle tracking air supply angle control method applicable to all vehicle models to improve the in-vehicle thermal comfort and provide technical support for the intelligent design of automotive air conditioning systems. Summary of the Invention
[0004] The purpose of the embodiments of the present invention is to provide an air supply method for a vehicle cockpit air conditioner based on solar angle tracking, aiming to solve the problems raised in the above background art.
[0005] The embodiments of the present invention are implemented as follows. An air supply method for a vehicle cockpit air conditioner based on solar angle tracking includes the following steps: Step 1: Define the solar angle, which is divided into the solar altitude angle and the solar azimuth angle; Step 2: Extract the characteristic points of the solar altitude angle irradiation range; Step 3: Extract the human characteristic points and establish the human hyperbola approximation equation; Step 4: Analyze the change of the irradiation range of the solar altitude angle on the vehicle over time according to the characteristic points of the solar altitude angle irradiation range, and establish the following equation of the air supply angle with respect to the solar altitude angle; Step 5: Extract the characteristic points of the solar azimuth angle irradiation range; Step 6: Analyze the change of the irradiation range of the solar azimuth angle on the vehicle over time according to the characteristic points of the solar azimuth angle irradiation range, and establish the following equation of the air supply angle with respect to the solar altitude angle.
[0006] A further technical solution is that in the above step 1, the solar angle is defined as follows: For the solar altitude angle, when the sun is near the horizon and the direction of the line connecting the car and the sun points to the driving direction of the car, this angle is set to 0°; when the sun is directly above in the sky, this angle is set to 90°; from the left view orientation of the car, the increase in the altitude angle is in the clockwise direction; for the solar azimuth angle, the positive direction of the car's travel is set to 0°; from the top view orientation of the car, the increase in the azimuth angle is also in the clockwise direction; the research range of the solar angle is: altitude angle [0, 90]; azimuth angle [-50, 50].
[0007] A further technical solution, step 2 includes the following specific steps: Referring to the existing front air vents of the car, there are a total of four air-conditioning air outlets in the front row of the passenger compartment model, namely left, middle left, middle right, and right; optimize the air supply angles of the left and middle left air outlets; Select points A, B, C, and D representing geometric features in the passenger compartment. Select point A as the coordinate origin and establish a two-dimensional Cartesian coordinate system, where the direction from the front to the back of the car is set as the positive direction of the x-axis, and the direction from the bottom to the top is set as the positive direction of the z-axis; measure the coordinates of these points representing the structural characteristics of the passenger compartment: That is, (0, 0); ; ; ; measure the coordinates of the air-conditioning air outlets .
[0008] A further technical solution, step 3 includes the following specific steps: For the extraction of human feature points, select to measure the coordinates of the driver's head top and the knee coordinates , select E and F as human feature points, draw an upward-opening parabola through the two feature points, take F as the lowest point of the parabola, and use this parabola to approximate the equation of the human hyperbola; the equation for approximating the human hyperbola is: .
[0009] A further technical solution, step 4 includes the following specific steps: Let the solar altitude angle be , when the solar altitude angle satisfies , the light center equation is as follows: ; The calculation formula for the coordinates of the target air supply point is: , where , , , , ; Optimal longitudinal air supply orientation The calculation formula is as follows: ; When the solar altitude angle satisfies ; The light center equation is as follows: ; The coordinates of the target air supply point in this case The calculation formula of is the same as that of the optimal longitudinal air supply orientation The calculation formula is the same as the above formula. The calculations of variables A, B, C, and a in the formula remain unchanged, and the variable ; When the solar altitude angle satisfies ; The light center equation is as follows: ; The coordinates of the target air supply point in this case The calculation formula of is the same as that of the optimal longitudinal air supply orientation The calculation formula is the same as the above formula. The calculations of variables A, B, C, and a in the formula remain unchanged, and the variable .
[0010] For a further technical solution, in step 5, points H, I, J, and K representing geometric features are selected in the passenger compartment. Point H is selected as the coordinate origin, and a two-dimensional Cartesian coordinate system is established, where the direction from the front to the back of the vehicle is set as the positive direction of the x-axis, and the direction from left to right is set as the positive direction of the y-axis. Measure the coordinates of these points representing the structural characteristics of the passenger compartment: That is, (0, 0); ; ; ; For the extraction of human feature points, in the case of the solar azimuth angle, use the same method to measure the coordinates of the top of the human head and the coordinates of the left knee ; Draw a parabola opening downward through points L and M, with M as the lowest point of the parabola, and use this parabola to replace the human curve; Measure the coordinates of the air conditioner air supply outlets as and .
[0011] For a further technical solution, step 6 includes the following specific steps: When the solar azimuth angle is 0°, the target point of the air conditioner air supply is set on the line y = y 12 ; Obtained from the above solar altitude angle-related formula, solve for : ; Therefore, the coordinates of the target air supply point are , and the optimal horizontal air supply orientation of the left air supply opening in this case: ; Similarly, the optimal horizontal air supply orientation of the middle left air supply opening : ; When the solar azimuth angle is not 0° and its absolute value is small, the target air supply point needs to be corrected; the correction amounts in three directions are respectively set as , and the corrected target air supply point is ; Let the solar azimuth angle be , then the empirical correction amounts are as follows: ; Substitute into the following formula to get: ; For the correction in the y direction, we get: ; When the azimuth angle satisfies , the air supply angle strategy is: the left air supply opening blows towards the human body part irradiated by the sun through the left window, and the middle left air supply opening blows towards the human body part irradiated by the sun through the front windshield; at this time, set the target air supply point of the middle left air supply opening as , and set the target air supply point of the left air supply opening as ; When the azimuth angle satisfies , the air supply angle strategy is: set the target air supply points of both the left air supply opening and the middle left air supply opening as ; When the azimuth angle satisfies , the air supply angle strategy is: set the target air supply points of both the left air supply opening and the middle left air supply opening as ; When the azimuth angle satisfies , the air supply angle strategy is: the left air supply opening blows towards the human body part irradiated by the sun through the front windshield, and the middle left air supply opening blows towards the human body part irradiated by the sun through the right window; at this time, set the target air supply point of the middle left air supply opening as , and set the target air supply point of the left air supply opening as .
[0012] A method for air supply of an automotive cockpit air conditioner based on solar angle tracking provided by an embodiment of the present invention analyzes the human body parts that can be irradiated by different solar altitude angles and solar azimuth angles, and gives the optimal air supply angle, providing technical support for researchers to evaluate the thermal comfort of automobiles and also providing a technical method for formulating the air supply strategy of automotive cockpit air conditioners. Description of the Drawings
[0013] Figure 1 It is a flowchart of a method for air supply of an automotive cockpit air conditioner based on solar angle tracking provided by an embodiment of the present invention; Figure 2 It is the research range of solar angles; Figure 3 It is the selection positions of points A, B, C, and D of geometric features; Figure 4 It is a schematic diagram of different solar altitude angles, where a, b, and c respectively correspond to different solar altitude angles; Figure 5 It is the selection positions of points H, I, J, and K of geometric features; Figure 6 It is a schematic diagram of different solar azimuth angles, where a, b, c, and d respectively correspond to different solar azimuth angles. Detailed Embodiment
[0014] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0015] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.
[0016] As Figure 1 shown, a method for air supply of an automotive cockpit air conditioner based on solar angle tracking provided by an embodiment of the present invention includes the following steps: Step 1: Define solar angles, which are divided into solar altitude angle and solar azimuth angle; Step 2: Extract the feature points of the solar altitude angle irradiation range; Step 3: Extract the human body feature points and establish the human body hyperbola approximation equation; Step 4: Analyze the change of the solar altitude angle irradiation range on the vehicle over time according to the feature points of the solar altitude angle irradiation range, and establish the following equation of the air supply angle with respect to the solar altitude angle; Step 5: Extract the feature points of the solar azimuth angle irradiation range; Step 6: Analyze the variation of the vehicle's irradiation range with time according to the characteristic points of the solar azimuth angle irradiation range, and establish a following equation of the air supply angle with respect to the solar altitude angle.
[0017] As a preferred embodiment of the present invention, in the said Step 1, the solar angles are defined as follows: For the solar altitude angle, when the sun is near the horizon and the direction of the line connecting the vehicle and the sun points to the driving direction of the vehicle, this angle is set to 0°; when the sun is directly above in the sky, this angle is set to 90°; from the left view azimuth of the vehicle, the increase in the altitude angle is in the clockwise direction. For the solar azimuth angle, the positive direction of the vehicle's travel is set to 0°; from the top view azimuth of the vehicle, the increase in the azimuth angle is also in the clockwise direction. Considering that not all combinations of azimuth angles and altitude angles will have a great impact on the thermal environment of the occupant compartment, the research range of the solar angles of this method is: altitude angle [0, 90]; azimuth angle [-50, 50], as Figure 2 shown.
[0018] As a preferred embodiment of the present invention, the said Step 2 includes the following specific steps: Referring to the existing front air vents of the vehicle, there are four air conditioning air supply vents in the front row of the occupant compartment model, namely left, middle left, middle right, and right. Since the left and middle left air supply vents are closer to the driver, this method mainly optimizes the air supply angles of these two air supply vents.
[0019] To explore the influence of the solar altitude angle on the solar irradiation range, several points A, B, C, and D representing geometric features need to be selected in the occupant compartment, as Figure 3 shown. Select point A as the coordinate origin, establish a two-dimensional Cartesian coordinate system, where the direction from the front to the back of the vehicle is set as the positive direction of the x-axis, and the direction from the bottom to the top is set as the positive direction of the z-axis. Measure the coordinates of these points representing the structural characteristics of the occupant compartment: i.e., (0, 0); ; ; . Measure the coordinates of the air conditioning air supply vents .
[0020] As a preferred embodiment of the present invention, the said Step 3 includes the following specific steps: For the extraction of human characteristic points, this method selects to measure the head coordinate and the knee coordinate of the driver, selects E and F as human characteristic points, and makes an upward-opening parabola through the two characteristic points, with F as the lowest point of the parabola, and uses this parabola to approximate the equation of the human hyperbola. The equation for approximating the human hyperbola is: ; The hyperbolic approximation equation of the human body established by this method can effectively take into account the differences in the heights of different drivers and meet personalized needs.
[0021] As a preferred embodiment of the present invention, step 4 includes the following specific steps: Let the solar altitude angle be , when the solar altitude angle is Figure 4 a, the situation shown, that is . The light center equation is as follows: ; The calculation formula of the target air supply point coordinates is: , where , , , , ; The calculation formula of the best longitudinal air supply azimuth is: ; When the solar altitude angle is Figure 4 b shown in the situation, that is ; The light center equation is as follows: ; The calculation formula of the target air supply point coordinates in this case and the calculation formula of the best longitudinal air supply azimuth are the same as the above formulas, and the calculations of variables A, B, C, and a in the formulas remain unchanged, and the variable ; When the solar altitude angle is Figure 4 c shown in the situation, That is ; The light center equation is as follows: ; The calculation formula of the target air supply point coordinates in this case and the calculation formula of the best longitudinal air supply azimuth are the same as the above formulas, and the calculations of variables A, B, C, and a in the formulas remain unchanged, and the variable .
[0022] As a preferred embodiment of the present invention, in step 5, in order to explore the influence of the solar azimuth angle on the solar irradiation range, several points H, I, J, and K representing geometric characteristics need to be selected in the passenger compartment, such as Figure 5As shown in the figure. Select point H as the origin of coordinates, and establish a two-dimensional Cartesian coordinate system, where the direction from the front to the back of the car is set as the positive direction of the x-axis, and the direction from left to right is set as the positive direction of the y-axis. Measure the coordinates of these points representing the structural characteristics of the occupant compartment: That is, (0, 0); ; ; ; For the extraction of human feature points, in the case of the solar azimuth angle, use the same method to measure the coordinates of the top of the human head and the coordinates of the left knee ; Draw a parabola opening downward through points L and M, with M as the lowest point of the parabola, and use this parabola to replace the human curve; Measure the coordinates of the air-conditioning air supply outlets as and .
[0023] As a preferred embodiment of the present invention, step 6 includes the following specific steps: When the solar azimuth angle is 0°, the target point of the air-conditioning air supply is set on the line y = y 12 ; Obtained from the above solar altitude angle related formula, solve for : ; Therefore, the coordinates of the target air supply point are , and the best lateral air supply azimuth of the left air supply outlet in this case: ; Similarly, the best lateral air supply azimuth of the middle left air supply outlet : ; When the solar azimuth angle is not 0° and the absolute value is small, it is necessary to correct the target air supply point ; The correction amounts in the three directions are respectively set as , and the corrected target air supply point is ; Let the solar azimuth angle be , then the empirical correction amounts are as follows: ; Substitute into the following formula to get: ; For the correction in the y direction: ; When the azimuth angle is as shown in Figure 6 a, that is, , at this time, a large amount of sunlight will shine on the driver through both the left window and the front windshield. The air supply angle strategy at this time is as follows: the left air supply outlet blows towards the human body part irradiated by the sun through the left window, and the middle left air supply outlet blows towards the human body part irradiated by the sun through the front windshield. At this time, the target air supply point of the middle left air supply outlet is set to , and the target air supply point of the left air supply outlet is set to .
[0024] When the azimuth angle is as Figure 6 shown in b, that is , at this time, the area of the light from the left window shining on the driver is relatively small. The air supply angle strategy at this time is as follows: the target air supply points of both the left air supply outlet and the middle left air supply outlet are set to .
[0025] When the azimuth angle is as Figure 6 shown in c, that is , at this time, the area of the light from the right window shining on the driver is relatively small. The air supply angle strategy at this time is as follows: the target air supply points of both the left air supply outlet and the middle left air supply outlet are set to .
[0026] When the azimuth angle is as Figure 6 shown in d, that is , at this time, a large amount of sunlight will shine on the driver through both the right window and the front windshield. The air supply angle strategy at this time is as follows: the left air supply outlet blows towards the human body part irradiated by the sun through the front windshield, and the middle left air supply outlet blows towards the human body part irradiated by the sun through the right window. At this time, the target air supply point of the middle left air supply outlet is set to , and the target air supply point of the left air supply outlet is set to .
[0027] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A method for supplying air to a vehicle cabin air conditioner based on sun angle tracking, characterized in that: The following steps are involved: Step 1: Define the sun angle, which is divided into solar altitude angle and solar azimuth angle; Step 2: Extraction of characteristic points of solar altitude angle illumination range; Step 3: Extraction of human body feature points and establishment of human body hyperbola approximation equation; Step 4: Analyze the change of the solar altitude angle to the vehicle illumination range over time according to the characteristic points of the solar altitude angle illumination range, and establish the following equation of the air supply angle to the solar altitude angle; Step 5: Extraction of characteristic points of the solar azimuth illumination range; Step 6: Analyze the change of the solar azimuth angle to the vehicle illumination range over time according to the characteristic points of the solar azimuth angle illumination range, and establish the following equation of the air supply angle to the solar altitude angle.
2. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 1, characterized in that: In step 1, the sun angle is defined as: For the solar altitude angle, when the sun is near the horizon and the direction of the line between the car and the sun points to the direction of the car's travel, this angle is set to 0°; when the sun is directly above the sky, this angle is set to 90°; from the left view of the car, the increase in altitude angle is clockwise; for the solar azimuth angle, the positive direction of the car's travel is set to 0°; from the top view of the car, the increase in azimuth angle is also clockwise; the research range of the solar angle is: altitude angle [0,90]; azimuth angle [-50,50].
3. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 2, characterized in that: The step 2 comprises the following specific steps: Referring to the existing front air outlets of automobiles, the front row of the passenger compartment model is equipped with four air-conditioning outlets, namely left, center-left, center-right, and right; the air supply angles of the left and center-left air outlets are optimized; Select points A, B, C and D representing geometric features in the passenger compartment, select point A as the origin of coordinates, and establish a two-dimensional Cartesian coordinate system, in which the direction from front to back of the car is set as the positive direction of the x-axis, and the direction from bottom to top is set as the positive direction of the z-axis; measure the coordinates of these points representing the structural characteristics of the passenger compartment: That is (0,0); ; ; ;Measure the coordinates of air outlet of air conditioner .
4. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 3, characterized in that: The step 3 comprises the following specific steps: For the extraction of human feature points, select the measurement of the driver's head coordinates and knee coordinates , select E and F as the human body feature points, make a parabola through the two feature points, take F as the lowest point of the parabola, and use this parabola to approximate the human body hyperbola equation; the human body hyperbola approximation equation is: 。 5. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 4, characterized in that: The step 4 comprises the following specific steps: Let the solar altitude angle be , when the solar altitude angle meets When , the equation of the light center is as follows: ； Target air supply point coordinates The calculation formula is: ,in , , , , ; Optimal vertical air supply orientation The calculation formula is: ； When the sun's altitude angle meets ; The equation of the light center is as follows: ； The target air supply point coordinates in this case The calculation formula and the optimal longitudinal air supply direction The calculation formula is the same as the above case. The variables A, B, C and a remain unchanged. ; When the sun's altitude angle meets ; The equation of the light center is as follows: ； The target air supply point coordinates in this case The calculation formula and the optimal longitudinal air supply direction The calculation formula is the same as the above case. The variables A, B, C and a remain unchanged. .
6. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 5, characterized in that: In step 5, points H, I, J and K representing geometric features are selected in the passenger compartment, point H is selected as the coordinate origin, and a two-dimensional Cartesian coordinate system is established, in which the direction from front to back of the car is set as the positive direction of the x-axis, and the direction from left to right is set as the positive direction of the y-axis; the coordinates of these points representing the structural characteristics of the passenger compartment are measured: That is (0,0); ; ; ; For the extraction of human feature points, the same method is used to measure the coordinates of the top of the human head in the case of the solar azimuth. and left knee coordinates ; Draw a downward parabola through points L and M, take M as the lowest point of the parabola, and use this parabola to replace the human body curve; measure the coordinates of the air outlet of the air conditioner and and .
7. The method for supplying air to the air conditioner in the vehicle cabin based on sun angle tracking according to claim 6, characterized in that: The step 6 comprises the following specific steps: When the solar azimuth is 0°, the target point of the air conditioning supply is set at y=y 12 In a straight line; From the above formula related to the solar altitude angle, we can solve : ； Therefore, the coordinates of the target air supply point are , the best horizontal air supply direction of the left air outlet in this case is: ； Similarly, the best horizontal air supply direction for the middle left air outlet : ； When the solar azimuth is not 0° and the absolute value is small, the target air supply point needs to be Correction is performed; the correction amounts in the three directions are set to , the corrected target air supply point is ; Let the solar azimuth be , the experience modifier is as follows: ； Will Substitute it into the following formula: ； The correction for the y direction is: ； When the azimuth satisfies When , the air supply angle strategy is: the left air supply outlet blows toward the human body part illuminated by the sun through the left window, and the middle left air supply outlet blows toward the human body part illuminated by the sun through the front window; at this time, the target air supply point of the middle left air supply outlet is set to , the target air supply point of the left air supply outlet is set to ; When the azimuth satisfies When the air supply angle strategy is: the target air supply points of the left air supply outlet and the center left air supply outlet are both set to ; When the azimuth satisfies When the air supply angle strategy is: the target air supply points of the left air supply outlet and the center left air supply outlet are both set to ; When the azimuth satisfies , the air supply angle strategy is: the left air supply outlet blows towards the human body part illuminated by the sun through the front windshield, and the middle left air supply outlet blows towards the human body part illuminated by the sun through the right window; at this time, the target air supply point of the middle left air supply outlet is set to , the target air supply point of the left air supply outlet is set to .