An active grille shutter opening control method, system, and electric vehicle

Abstract

This invention provides a method, system, and electric vehicle for controlling the opening of an active air intake grille. The method is as follows: After vehicle startup, it detects whether the vehicle's air conditioning is currently running. If the detection result is no, the opening of the first active air intake grille required for thermal management of the motor, battery, and vehicle air conditioning refrigerant is used as the opening of the active air intake grille. If the detection result is yes, when the vehicle air conditioning is in cooling mode, the active air intake grille opening is formed by combining the first and second active air intake grille openings; when the vehicle air conditioning is in heating mode, the active air intake grille opening is formed by combining the first and third active air intake grille openings. The second active air intake grille opening is the active air intake grille opening required for cooling mode, and the third active air intake grille opening is the active air intake grille opening required for heating mode. A control strategy corresponding to the active air intake grille opening is designed for thermal management control under different operating conditions, minimizing the air intake grille's resistance while meeting the required active air intake grille opening for thermal management.

Description

Technical Field

[0001] This invention relates to the field of active grille control technology, and provides an active grille opening control method, system, and electric vehicle. Background Technology

[0002] The research and development of new energy vehicles has become increasingly important in the automotive industry, and active grille shutters have become an important feature of most new energy vehicles.

[0003] The working principle of the active grille shutter is as follows: When the car is moving, the airflow passes through the outer grille and the active grille in sequence. The active grille blades control the opening and closing angle according to the airflow. The change in the opening of the grille will cause changes in the effective frontal area of ​​the vehicle's cooling system and the internal flow resistance, which in turn affects the overall vehicle performance.

[0004] Existing active grille shutters control the opening of the air conditioning system by acquiring the target pressure and actual pressure, and then using the absolute value of the difference between the actual pressure and the target pressure and a preset threshold. However, this active grille shutter opening control only considers part of the thermal management requirements and has insufficient control precision. Summary of the Invention

[0005] In view of this, this application provides an active air intake grille opening control method, which aims to improve the above-mentioned problems.

[0006] Specifically, the following technical solutions are included:

[0007] On the one hand, embodiments of this application provide a method for controlling the opening degree of an active air intake grille, the method being as follows:

[0008] After starting the vehicle, check if the vehicle's air conditioning is currently running;

[0009] If the test result is negative, the opening of the first active air intake grille required for the thermal management of the motor, battery and vehicle air conditioning refrigerant will be taken as the opening of the active air intake grille.

[0010] If the test result is yes, when the vehicle air conditioner is in cooling mode, the opening of the active air intake grille is formed by combining the opening of the first active air intake grille and the opening of the second active air intake grille; when the vehicle air conditioner is in heating mode, the opening of the active air intake grille is formed by combining the opening of the first active air intake grille and the opening of the third active air intake grille.

[0011] The second active air intake grille opening is the active air intake grille opening required for cooling operation, and the third active air intake grille opening is the active air intake grille opening required for heating operation.

[0012] In some embodiments of the present invention, the method for determining the opening degree of the first active air intake grille is as follows:

[0013] (11) Determine the current required circulating fluid target temperature AC_Set for the refrigerant, the current required circulating fluid target temperature Bat_Set for the battery, and the current required circulating fluid target temperature Mot_Set for the motor;

[0014] (12) Determine the final circulating fluid temperature T_Target based on the circulating fluid target temperature AC_Set, circulating fluid target temperature Bat_Set and circulating fluid target temperature Mot_Sett;

[0015] (13) The opening of the active air intake grille required for the temperature of the circulating fluid T_Target is taken as the first active air intake grille opening.

[0016] In some embodiments of the present invention, the process for determining the target temperature AC_Set of the circulating fluid is as follows:

[0017] Construct an ambient temperature-target temperature mapping table. When the ambient temperature is greater than the temperature threshold, the circulating fluid target temperature AC_Set increases as the ambient temperature increases. When the ambient temperature is less than the temperature threshold, the circulating fluid target temperature AC_Set remains at the lowest temperature.

[0018] Determine the current ambient temperature and read the required circulating fluid target temperature AC_Set from the ambient temperature-target temperature mapping table.

[0019] In some embodiments of the present invention, the target temperature AC_Set of the circulating fluid and the target temperature Bat_Set of the circulating fluid are taken as the minimum value of the target temperature Mot_Set of the circulating fluid as the final temperature T_Target of the circulating fluid.

[0020] In some embodiments of the present invention, the method for determining the opening degree of the second active air intake grille is as follows:

[0021] The current speed of the cooling fan is determined based on the current vehicle speed and the operating pressure of the vehicle's air conditioning.

[0022] If the current speed of the cooling fan is zero, then the opening of the second active air intake grille is set to zero. If the current speed of the cooling fan is not zero, the opening of the active air intake grille required for the current vehicle speed and the working pressure of the vehicle air conditioner is determined, and the currently determined opening of the active air intake grille is used as the opening of the second active air intake grille.

[0023] In some embodiments of the present invention, the process for determining the rotational speed of the cooling fan is as follows:

[0024] A mapping table of vehicle air conditioning working pressure, vehicle speed, and cooling fan speed is constructed. When driving at low speed, the higher the working pressure of the vehicle air conditioning, the higher the speed required by the cooling fan. When driving at non-low speed, the cooling fan speed is set to zero when the working pressure of the vehicle air conditioning is lower than the set pressure threshold, and the cooling fan speed is set to a larger value when the working pressure of the vehicle air conditioning is higher than the set pressure threshold. The pressure threshold increases with the increase of vehicle speed.

[0025] The cooling fan speed under the current vehicle speed and the vehicle air conditioning operating pressure is determined based on the mapping table of vehicle air conditioning working pressure, vehicle speed, and cooling fan speed.

[0026] In some embodiments of the present invention, the process for determining the opening degree of the second active air intake grille is as follows:

[0027] The vehicle air conditioning operating pressure-vehicle speed-active grille opening mapping table shows that when driving at low speeds, the active grille is fully open, and the opening of the active grille decreases as the vehicle speed increases. When driving at higher speeds, the opening of the active grille increases as the vehicle air conditioning operating pressure increases.

[0028] Based on the vehicle air conditioning operating pressure, vehicle speed, and active grille opening, the active grille opening corresponding to the current vehicle speed and vehicle air conditioning operating pressure is read, and the currently read active grille opening is used as the second grille opening.

[0029] In some embodiments of the present invention, the method for determining the opening degree of the third active air intake grille is as follows:

[0030] The speed of the cooling fan is determined based on the circulating fluid temperature T_Target. The current speed of the cooling fan and the required active air intake grille opening for the current vehicle speed are then determined. The currently determined active air intake grille opening is used as the third active air intake grille opening.

[0031] In some embodiments of the present invention, the process for determining the rotational speed of the cooling fan is as follows:

[0032] Construct a mapping table between circulating fluid temperature and cooling fan speed, where the cooling fan speed increases as the circulating fluid temperature T_Targe rises;

[0033] The cooling fan speed is read based on the circulating fluid temperature-cooling fan speed mapping table to determine the current circulating fluid temperature T_Targe.

[0034] In some embodiments of the present invention, the method for determining the opening degree of the third active air intake grille is as follows:

[0035] Construct a mapping table of cooling fan speed - vehicle speed - active air intake grille opening. When driving at low speed, the active air intake grille is fully open, and the opening of the active air intake grille decreases as the vehicle speed increases. When driving at non-low speed, the opening of the active air intake grille increases as the cooling fan speed increases.

[0036] The active air intake grille opening is read from the current vehicle speed and the current radiator fan speed mapping table, and the currently read active air intake grille opening is used as the third active air intake grille opening.

[0037] On the other hand, embodiments of this application provide an active grille shutter opening control system, the system comprising:

[0038] A first controller and a second controller, wherein the first controller and the second controller are communicatively connected;

[0039] A temperature sensor used to collect ambient temperature is connected in communication with the first controller.

[0040] Active grille shutters, communicating with the second controller

[0041] The first controller reads the current ambient temperature, vehicle speed, and operating pressure of the vehicle's air conditioning system in real time, and determines the opening degree of the active air intake grille based on the aforementioned active air intake grille opening control method. The determined active air intake grille opening degree is then sent to the second controller, which controls the opening degree of the active air intake grille to the currently determined active air intake grille opening degree.

[0042] On the other hand, embodiments of this application provide an electric vehicle on which the above-mentioned active air intake grille opening control system is integrated.

[0043] This invention designs a control strategy for the opening of the active air intake grille corresponding to different operating conditions for thermal management control, so as to reduce the wind resistance of the air intake grille as much as possible while meeting the active air intake grille opening required for thermal management. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart of an active air intake grille opening control method provided in an embodiment of the present invention;

[0046] Figure 2A schematic diagram of the structure of the active air intake grille opening control system provided in an embodiment of the present invention;

[0047] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0050] Figure 1 A flowchart of an active air intake grille opening control method provided in an embodiment of the present invention, the method comprising the following steps:

[0051] After the vehicle is started, it is checked whether the vehicle currently has a thermal management requirement. If not, the active air intake grille is kept closed. If it does, the current operating condition is determined first, and then the opening degree of the active air intake grille under the current operating condition is obtained. The operating conditions include: vehicle air conditioning not started, vehicle air conditioning heating, and vehicle air conditioning cooling.

[0052] When there is no thermal management requirement in the passenger compartment, vehicle air conditioning, battery, and motor, the vehicle does not have a thermal management requirement. When there is a thermal management requirement in one of the passenger compartment, battery, and motor, the vehicle has a thermal management requirement. The passenger compartment is cooled or heated by the vehicle air conditioning.

[0053] When there is a heating or cooling request in the passenger compartment, the passenger compartment has thermal management requirements; the passenger compartment is cooled or heated by the vehicle's air conditioning system; when there is a heating or cooling request in the battery, the battery has thermal management requirements; when there is a heat dissipation request in the motor, the battery has heat pipe requirements; when there is a cooling or heating request in the refrigerant of the vehicle's air conditioning system, the vehicle's air conditioning system has thermal management requirements.

[0054] (1) When the vehicle air conditioner is not started, determine the opening of the first active air intake grille required for the thermal management of the motor, battery and vehicle air conditioner refrigerant;

[0055] (11) Determine the current required circulating fluid target temperature AC_Set for the refrigerant, the current required circulating fluid target temperature Bat_Set for the battery, and the current required circulating fluid target temperature Mot_Set for the motor;

[0056] (a) The process for determining the current required circulating liquid target temperature AC_Set of the refrigerant is as follows:

[0057] An ambient temperature-target temperature mapping table is constructed. By calibrating the circulating fluid target temperature AC_Set corresponding to different ambient temperatures, when the ambient temperature is higher than the temperature threshold (25℃), the higher the ambient temperature T, the higher the circulating fluid target temperature AC_Set. When the ambient temperature is lower than the temperature threshold, the circulating fluid target temperature AC_Set is maintained at the lowest temperature (15℃). The current ambient temperature is determined, and the required circulating fluid target temperature AC_Set is read from the ambient temperature-target temperature mapping table.

[0058] (b) The target inlet water temperature Bat_Set on the battery side is a set value, Bat_Set=150℃.

[0059] (c) The process for determining the target circulating fluid temperature Mot_Set required by the motor is as follows:

[0060] An ambient temperature T-target temperature mapping table is constructed. By calibrating the circulating fluid temperature Mot_Set under different ambient temperatures, when the ambient temperature is higher than the temperature threshold (30℃), the circulating fluid temperature Mot_Set increases with the increase of the ambient temperature. When the ambient temperature is lower than the temperature threshold, the circulating fluid temperature Mot_Set is the lowest temperature value (40℃). The current ambient temperature is determined, and the required circulating fluid target temperature Mot_Set for the motor is read based on the ambient temperature T-target temperature mapping table.

[0061] (12) Determine the final temperature T_Target of the circulating fluid in the circulation system based on the circulating fluid target temperature AC_Set, circulating fluid target temperature Bat_Set and circulating fluid target temperature Mot_Sett;

[0062] In this embodiment of the invention, since the vehicle air conditioner, motor and battery exchange energy through a circulation system to achieve heating and cooling of the vehicle air conditioner, motor and battery, the final temperature T_Target of the circulating fluid needs to take into account the current required circulating fluid target temperature AC_Set of the refrigerant, the current required circulating fluid target temperature Bat_Set of the battery and the current required circulating fluid target temperature Mot_Set of the motor. The minimum value of the circulating fluid target temperature AC_Set, circulating fluid target temperature Bat_Set and circulating fluid target temperature Mot_Set is taken as the final temperature T_Target of the circulating fluid.

[0063] (13) The opening of the active air intake grille required for the temperature of the circulating fluid T_Target is taken as the first active air intake grille opening.

[0064] (a) Determine the required cooling fan speed for the current circulating fluid temperature T_Target. The cooling fan is used for cooling the water tank. The blade opening of the active air intake grille is mainly used for cooling the water tank. The present invention aims to balance the wind resistance of the active air intake grille while controlling the blade opening of the active air intake grille to achieve cooling of the water tank.

[0065] Construct a mapping table between circulating fluid temperature and cooling fan speed to determine the required cooling fan speed for different circulating fluid temperatures T_Target. The higher the final circulating fluid temperature T_Target, the higher the required cooling fan speed.

[0066] (b) Read the current vehicle speed and determine the opening of the first active air intake grille based on the current vehicle speed and the speed of the cooling fan.

[0067] A mapping table is constructed to map radiator fan speed, vehicle speed, and active air intake grille opening. This table calibrates the active air intake grille opening corresponding to different radiator fans at different vehicle speeds. The higher the required radiator fan speed, the larger the first active air intake grille opening. When the vehicle speed exceeds a threshold (80 km / h), the first active air intake grille opening decreases with increasing vehicle speed. At lower speeds, wind resistance is lower, and thermal management is prioritized; therefore, a higher radiator fan speed requires a larger active air intake grille opening to enhance cooling. However, at higher vehicle speeds, wind resistance is greater, so the active air intake grille opening decreases with increasing vehicle speed. The current radiator fan speed and the corresponding active air intake grille opening are read from the mapping table, and the currently read active air intake grille opening is used as the opening of the first active air intake grille.

[0068] (2) When the vehicle air conditioner is in cooling mode, the opening of the second active air intake grille required for cooling mode is determined based on the working pressure of the vehicle air conditioner (the working pressure of the compressor) and the current vehicle speed.

[0069] In this embodiment of the invention, the current speed of the cooling fan is first determined based on the current vehicle speed and the working pressure of the vehicle air conditioner. If the current speed of the cooling fan is zero, the opening of the second active air intake grille is set to zero. If the current speed of the cooling fan is not zero, the opening of the active air intake grille required for the current vehicle speed and the working pressure of the vehicle air conditioner is determined, and the opening of the active air intake grille is taken as the second active air intake grille opening.

[0070] In this embodiment of the invention, a mapping table of vehicle air conditioning working pressure, vehicle speed, and cooling fan speed is first constructed to calibrate the cooling fan speed corresponding to different vehicle air conditioning working pressures at different vehicle speeds. When driving at low speeds (below 20 km / h), the higher the working pressure of the vehicle air conditioning, the higher the required speed of the cooling fan. When driving at non-low speeds, when the working pressure of the vehicle air conditioning is lower than the set pressure threshold, the speed of the cooling fan is set to zero. The pressure threshold increases with the increase of vehicle speed. When the working pressure of the vehicle air conditioning is higher than the set pressure threshold, the cooling fan is set to a larger speed value. Since the opening of the active air intake grille can assist the cooling fan in heat dissipation and increase the efficiency of heat dissipation, the speed of the cooling fan needs to be determined before determining the opening degree of the active air intake grille.

[0071] Read the vehicle's current speed and the operating pressure of the vehicle's air conditioning system, and determine the corresponding cooling fan speed based on the vehicle's air conditioning operating pressure-vehicle speed-cooling fan speed mapping table.

[0072] In this embodiment of the invention, a mapping table of vehicle air conditioning operating pressure, vehicle speed, and active air intake grille opening is constructed to calibrate the active air intake grille opening corresponding to different vehicle air conditioning operating pressures at different vehicle speeds. During low-speed driving (speed less than or equal to 50 km / h), the active air intake grille is fully opened, allowing for sufficient heat dissipation and minimizing wind resistance. The opening of the active air intake grille decreases as vehicle speed increases. During non-low-speed driving, the opening of the active air intake grille increases as the vehicle air conditioning operating pressure increases. The current vehicle speed and vehicle air conditioning operating pressure are read, and the active air intake grille opening corresponding to the current vehicle speed and vehicle air conditioning operating pressure is read based on the vehicle air conditioning operating pressure-vehicle speed-active air intake grille opening value. The currently read active air intake grille opening is used as the second air intake grille opening.

[0073] (3) When the vehicle air conditioner is in heating mode, the opening of the third active air intake grille required for heating mode is determined based on the current fan speed and vehicle speed.

[0074] In this embodiment of the invention, the speed of the cooling fan is first determined based on the circulating fluid temperature T_Target, and the required active air intake grille opening for the current vehicle speed and the cooling fan speed are determined. The currently determined active air intake grille opening is then used as the third active air intake grille opening.

[0075] In this embodiment of the invention, a mapping table of circulating fluid temperature and cooling fan speed is first constructed to determine the required cooling fan speed for different circulating fluid temperatures T_Targe. The higher the circulating fluid temperature T_Targe, the higher the cooling fan speed. The cooling fan speed corresponding to the current circulating fluid temperature is then read based on the circulating fluid temperature-cooling fan speed mapping table.

[0076] In this embodiment of the invention, a mapping table of cooling fan speed - vehicle speed - active air intake grille opening is first constructed. The active air intake grille opening corresponding to different cooling fan speeds at different vehicle speeds is calibrated. The active air intake grille opening decreases as vehicle speed increases. At low speeds (speed less than or equal to 60 km / h), the active air intake grille is fully open. At higher speeds, the active air intake grille opening increases as cooling fan speed increases. The current vehicle speed and cooling fan speed are read, and the corresponding active air intake grille opening is read from the cooling fan speed - vehicle speed - active air intake grille opening mapping table. The currently read active air intake grille opening is used as the third active air intake grille opening.

[0077] When the vehicle air conditioner is not turned on, the opening of the first active air intake grille is taken as the final active air intake grille opening. When the vehicle air conditioner is turned on, if the vehicle air conditioner is in cooling mode, the larger value between the opening of the first active air intake grille and the opening of the second active air intake grille is taken as the opening of the active air intake grille. If the vehicle air conditioner is in heating mode, the larger value between the opening of the first active air intake grille and the opening of the third active air intake grille is taken as the opening of the active air intake grille.

[0078] This invention designs a control strategy for the opening of the active air intake grille corresponding to the thermal management control of the motor, battery, and vehicle air conditioner under different operating conditions. While meeting the active air intake grille opening required for thermal management, it minimizes the wind resistance of the air intake grille as much as possible.

[0079] Figure 2 This is a schematic diagram of the structure of the active air intake grille opening control system provided in an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown. The system includes:

[0080] A first controller and a second controller, wherein the first controller and the second controller are communicatively connected;

[0081] A temperature sensor used to collect ambient temperature is connected in communication with the first controller.

[0082] Active grille shutters, communicating with the second controller

[0083] The first controller reads the current ambient temperature, vehicle speed, and operating pressure of the vehicle's air conditioning system in real time, and determines the opening degree of the active air intake grille based on the aforementioned active air intake grille opening control method. The determined active air intake grille opening degree is then sent to the second controller, which controls the opening degree of the active air intake grille to the currently determined active air intake grille opening degree.

[0084] The present invention also provides an electric vehicle that integrates the above-mentioned active air intake grille opening control system. After the vehicle is started, the current operating condition of the vehicle is identified, and the opening of the active air intake grille is controlled based on the control strategy of the active air intake grille opening under the corresponding operating condition. While meeting the active air intake grille opening required for thermal management, the wind resistance of the air intake grille is reduced as much as possible.

[0085] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0086] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for controlling the opening degree of an active air intake grille, characterized in that, The method is as follows: After starting the vehicle, check if the vehicle's air conditioning is currently running; If the test result is negative, the opening of the first active air intake grille required for the thermal management of the motor, battery and vehicle air conditioning refrigerant will be taken as the opening of the active air intake grille. If the test result is yes, when the vehicle air conditioner is in cooling mode, the opening of the active air intake grille is formed by combining the opening of the first active air intake grille and the opening of the second active air intake grille; when the vehicle air conditioner is in heating mode, the opening of the active air intake grille is formed by combining the opening of the first active air intake grille and the opening of the third active air intake grille. The second active air intake grille opening is the active air intake grille opening required for cooling operation, and the third active air intake grille opening is the active air intake grille opening required for heating operation.

2. The method for controlling the opening of the active air intake grille as described in claim 1, characterized in that, The method for determining the opening of the first active air intake grille is as follows: (11) Determine the current required circulating fluid target temperature AC_Set for the refrigerant, the current required circulating fluid target temperature Bat_Set for the battery, and the current required circulating fluid target temperature Mot_Set for the motor; (12) Determine the final circulating fluid temperature T_Target based on the circulating fluid target temperature AC_Set, circulating fluid target temperature Bat_Set and circulating fluid target temperature Mot_Sett; (13) The opening of the active air intake grille required for the temperature of the circulating fluid T_Target is taken as the first active air intake grille opening.

3. The method for controlling the opening of the active air intake grille as described in claim 2, characterized in that, The specific process for determining the target temperature AC_Set of the circulating fluid is as follows: Construct an ambient temperature-target temperature mapping table. When the ambient temperature is greater than the temperature threshold, the circulating fluid target temperature AC_Set increases as the ambient temperature increases. When the ambient temperature is less than the temperature threshold, the circulating fluid target temperature AC_Set remains at the lowest temperature. Determine the current ambient temperature and read the required circulating fluid target temperature AC_Set from the ambient temperature-target temperature mapping table.

4. The method for controlling the opening of the active air intake grille as described in claim 1, characterized in that, The target temperature AC_Set and target temperature Bat_Set of the circulating fluid are taken, and the minimum value of the target temperature Mot_Set of the circulating fluid is taken as the final temperature T_Target of the circulating fluid.

5. The method for controlling the opening of the active air intake grille as described in claim 1, characterized in that, The method for determining the opening of the second active air intake grille is as follows: The current speed of the cooling fan is determined based on the current vehicle speed and the operating pressure of the vehicle's air conditioning. If the current speed of the cooling fan is zero, then the opening of the second active air intake grille is set to zero. If the current speed of the cooling fan is not zero, the opening of the active air intake grille required for the current vehicle speed and the working pressure of the vehicle air conditioner is determined, and the currently determined opening of the active air intake grille is used as the opening of the second active air intake grille.

6. The method for controlling the opening of the active air intake grille as described in claim 5, characterized in that, The process for determining the speed of the cooling fan is as follows: A mapping table of vehicle air conditioning working pressure, vehicle speed, and cooling fan speed is constructed. When driving at low speed, the higher the working pressure of the vehicle air conditioning, the higher the speed required by the cooling fan. When driving at non-low speed, the cooling fan speed is set to zero when the working pressure of the vehicle air conditioning is lower than the set pressure threshold, and the cooling fan speed is set to a larger value when the working pressure of the vehicle air conditioning is higher than the set pressure threshold. The pressure threshold increases with the increase of vehicle speed. The cooling fan speed under the current vehicle speed and the vehicle air conditioning operating pressure is determined based on the mapping table of vehicle air conditioning working pressure, vehicle speed, and cooling fan speed.

7. The method for controlling the opening of the active air intake grille as described in claim 5, characterized in that, The process for determining the opening of the second active air intake grille is as follows: The vehicle air conditioning operating pressure-vehicle speed-active grille opening mapping table shows that when driving at low speeds, the active grille is fully open, and the opening of the active grille decreases as the vehicle speed increases. When driving at higher speeds, the opening of the active grille increases as the vehicle air conditioning operating pressure increases. Based on the vehicle air conditioning operating pressure, vehicle speed, and active grille opening, the active grille opening corresponding to the current vehicle speed and vehicle air conditioning operating pressure is read, and the currently read active grille opening is used as the second grille opening.

8. The method for controlling the opening of the active air intake grille as described in claim 1, characterized in that, The method for determining the opening of the third active air intake grille is as follows: The speed of the cooling fan is determined based on the circulating fluid temperature T_Target. The current speed of the cooling fan and the required active air intake grille opening for the current vehicle speed are then determined. The currently determined active air intake grille opening is used as the third active air intake grille opening.

9. The method for controlling the opening of the active air intake grille as described in claim 8, characterized in that, The process for determining the speed of the cooling fan is as follows: Construct a mapping table between circulating fluid temperature and cooling fan speed, where the cooling fan speed increases as the circulating fluid temperature T_Targe rises; The cooling fan speed is read based on the circulating fluid temperature-cooling fan speed mapping table to determine the current circulating fluid temperature T_Targe.

10. The method for controlling the opening of the active air intake grille as described in claim 8, characterized in that, The method for determining the opening of the third active air intake grille is as follows: Construct a mapping table of cooling fan speed - vehicle speed - active air intake grille opening. When driving at low speed, the active air intake grille is fully open, and the opening of the active air intake grille decreases as the vehicle speed increases. When driving at non-low speed, the opening of the active air intake grille increases as the cooling fan speed increases. The active air intake grille opening is read from the current vehicle speed and the current radiator fan speed mapping table, and the currently read active air intake grille opening is used as the third active air intake grille opening.

11. An active air intake grille opening control system, characterized in that, The system includes: A first controller and a second controller, wherein the first controller and the second controller are communicatively connected; A temperature sensor used to collect ambient temperature is connected in communication with the first controller. Active grille shutters, communicating with the second controller The first controller reads the current ambient temperature, vehicle speed, and operating pressure of the vehicle air conditioner in real time, and determines the opening degree of the active air intake grille based on the active air intake grille opening control method according to any one of claims 1 to 10, and sends the determined active air intake grille opening degree to the second controller, which controls the opening degree of the active air intake grille to the currently determined active air intake grille opening degree.

12. An electric vehicle, characterized in that, The electric vehicle integrates an active grille opening control system as described in claim 11.

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