Opening degree control method and system for active air inlet grille and electric automobile

Abstract

The invention provides an opening degree control method and system for an active air inlet grille and an electric vehicle. The method specifically comprises the following steps that after the vehicle is started, whether a vehicle-mounted air conditioner is started currently or not is detected; if the detection result is no, the opening degree of a first active air inlet grille required by thermal management of a motor, a battery and a vehicle-mounted air conditioner refrigerant serves as the opening degree of the active air inlet grille; if the detection result is yes, when the vehicle-mounted air conditioner is in the refrigeration working condition, the first active air inlet grille opening degree and the second active air inlet grille opening degree are synthesized to form the active air inlet grille opening degree, and when the vehicle-mounted air conditioner is in the heating working condition, the first active air inlet grille opening degree and the third active air inlet grille opening degree are synthesized to form the active air inlet grille opening degree; the second active air-inlet grille opening degree is the active air-inlet grille opening degree required by the refrigeration working condition, and the third active air-inlet grille opening degree is the active air-inlet grille opening degree required by the heating working condition. A control strategy corresponding to the opening degree of the active air inlet grille is designed for thermal management control under different working conditions, and under the condition that the opening degree of the active air inlet grille required by thermal management is met, the wind resistance of the air inlet grille is reduced as much as possible.

Description

Technical Field

[0001] The invention relates to the technical field of active air intake grille control, and provides an active air intake grille opening control method, system and electric vehicle. Background Art

[0002] The research and development of new energy vehicles has become increasingly important in the automotive field, and active air intake grilles have also become an important configuration for most new energy vehicles.

[0003] The working principle of the active air intake grille is: when the car is driving, the airflow passes through the outer grille and the active air intake grille in turn, and the active air intake grille blades control the opening and closing angles according to the airflow. The change in the opening of the air intake grille will cause the effective windward area of ​​the vehicle's cooling system and internal flow and other resistance changes, which will affect the performance of the vehicle.

[0004] The existing active air intake grille obtains the target pressure and actual pressure of the air conditioner, and controls the opening of the active air intake grille based on the absolute value of the difference between the actual pressure and the target pressure and a preset threshold. The above-mentioned active air intake grille opening control only considers part of the thermal management requirements and has the problem of insufficient control accuracy. Summary of the invention

[0005] In view of this, the present application provides a method for controlling the opening of an active air intake grille, aiming to improve the above-mentioned problem.

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

[0007] On the one hand, an embodiment of the present application provides a method for controlling the opening of an active air intake grille, and the method is specifically as follows:

[0008] After the vehicle is started, detect whether the vehicle air conditioner is currently started;

[0009] If the detection result is no, the first active air intake grille opening required for thermal management of the motor, the battery and the vehicle air conditioning refrigerant is used as the opening of the active air intake grille;

[0010] If the detection result is yes, when the vehicle air conditioner is in cooling condition, the opening of the first active air intake grille and the opening of the second active air intake grille are integrated to form the opening of the active air intake grille; when the vehicle air conditioner is in heating condition, the opening of the first active air intake grille and the opening of the third active air intake grille are integrated to form the opening of the active air intake grille;

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

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

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

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

[0015] (13) The active air intake grille opening required by the warm circulating fluid temperature T_Target is used as the first active air intake grille opening.

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

[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 maintains the lowest temperature.

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

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

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

[0021] Determine the current speed of the cooling fan based on the current vehicle speed and the working pressure of the vehicle air conditioner;

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

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

[0024] A mapping table of vehicle air conditioner working pressure-vehicle speed-cooling fan speed is constructed. When the vehicle is driving at a low speed, the greater the working pressure of the vehicle air conditioner, the higher the required speed of the cooling fan. When the vehicle is not driving at a low speed, when the working pressure of the vehicle air conditioner is lower than the set pressure threshold, the speed of the cooling fan is set to zero. When the working pressure of the vehicle air conditioner is higher than the set pressure threshold, the cooling fan is set to a larger speed value, wherein the pressure threshold increases with the increase of the vehicle speed.

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

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

[0027] The vehicle air conditioning working pressure-vehicle speed-active air intake grille opening mapping table controls the active air intake grille to be fully opened when driving at low speed, 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 vehicle air conditioning working pressure increases.

[0028] The active air intake grille opening corresponding to the current vehicle speed and the vehicle air conditioning working pressure is read based on the vehicle air conditioning working pressure-vehicle speed-active air intake grille opening, and the currently read active air intake grille opening is used as the second air intake grille opening.

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

[0030] The rotation speed of the cooling fan is determined based on the circulating fluid temperature T_Target, the current rotation speed of the cooling fan and the active air intake grille opening required for the current vehicle speed are determined, and 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 of determining the speed of the cooling fan is specifically as follows:

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

[0033] Based on the circulating fluid temperature-cooling fan speed mapping table, the cooling fan speed at the current circulating fluid temperature T_Targe is read.

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

[0035] Construct a cooling fan speed-vehicle speed-active air intake grille opening mapping table. 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 at the current vehicle speed and the speed of the cooling fan is read from the cooling fan speed-vehicle speed-active air intake grille opening 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, an embodiment of the present application provides an opening control system of an active air intake grille, the system comprising:

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

[0039] A temperature sensor for collecting ambient temperature, which is communicatively connected with the first controller;

[0040] Active air intake grille, communicating with the second controller

[0041] The first controller reads the current ambient temperature, vehicle speed and working pressure of the vehicle air conditioner in real time, and determines the opening of the active air intake grille based on the above-mentioned active air intake grille opening control method, and sends the determined active air intake grille opening to the second controller, and the second controller controls the opening of the active air intake grille to the currently determined active air intake grille opening.

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

[0043] The present invention designs a control strategy corresponding to the opening of the active air intake grille for thermal management control under different working conditions, and reduces the wind resistance of the air intake grille as much as possible while satisfying the opening of the active air intake grille required for thermal management. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A flow chart of a method for controlling the opening of an active air intake grille provided by an embodiment of the present invention;

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

[0047] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0050] Figure 1 A flow chart of a method for controlling the opening of an active air intake grille provided by an embodiment of the present invention, the method comprising the following steps:

[0051] After the vehicle is started, it is detected whether the vehicle currently has thermal management requirements. If not, the active air intake grille is controlled to be in a closed state. If so, the current operating condition is first determined, and then the opening of the active air intake grille under the current operating condition is obtained. The operating conditions include: the vehicle air conditioner is not started, the vehicle air conditioner is heating, and the vehicle air conditioner is cooling.

[0052] When there is no thermal management request for the passenger compartment, vehicle air conditioning, battery and motor, there is no need for heat pipes for the entire vehicle. When there is a thermal management requirement for one of the passenger compartment, battery and motor, there is a thermal management requirement for the entire vehicle, and the passenger compartment is cooled or heated by the vehicle air conditioning.

[0053] When there is a heating request or cooling request in the passenger compartment, there is a thermal management demand in the passenger compartment; the passenger compartment is cooled or heated by the vehicle air conditioner; when there is a heating request or cooling request for the battery, there is a thermal management demand for the battery; when there is a heat dissipation request for the motor, there is a heat pipe demand for the battery, and when there is a cooling or heating demand for the refrigerant of the vehicle air conditioner, there is a thermal management demand for the vehicle air conditioner.

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

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

[0056] (a) The process of determining the circulating fluid target temperature AC_Set currently required by the refrigerant is as follows:

[0057] Construct an ambient temperature-target temperature mapping table, and calibrate the circulating fluid target temperature AC_Set corresponding to different ambient temperatures. When the ambient temperature is greater than the temperature threshold (25°C), the higher the ambient temperature T, the higher the circulating fluid target temperature AC_Set. When the ambient temperature is less than the temperature threshold, the circulating fluid target temperature AC_Set maintains the lowest temperature (15°C). Determine the current ambient temperature, and read the currently required circulating fluid target temperature AC_Set from the ambient temperature-target temperature mapping table.

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

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

[0060] Construct an ambient temperature T-target temperature mapping table, and calibrate the circulating fluid temperature Mot_Set under different ambient temperatures. When the ambient temperature is higher than the temperature threshold (30°C), 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°C). Determine the current ambient temperature, and read the circulating fluid target temperature Mot_Set currently required by the motor based on the ambient temperature T-target temperature mapping table.

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

[0062] In an embodiment of the present 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 consider the circulating fluid target temperature AC_Set currently required by the refrigerant, the circulating fluid target temperature Bat_Set currently required by the battery and the circulating fluid target temperature Mot_Set currently required by the motor, and the minimum value of the circulating fluid target temperature AC_Set, the circulating fluid target temperature Bat_Set and the circulating fluid target temperature Mot_Set is taken as the final temperature T_Target of the circulating fluid.

[0063] (13) The active air intake grille opening required by the warm circulating fluid temperature T_Target is used as the first active air intake grille opening.

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

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

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

[0067] Construct a cooling fan speed-vehicle speed-active air intake grille opening mapping table, calibrate the active air intake grille opening corresponding to different cooling fans at different vehicle speeds, the higher the current required cooling fan speed, the larger the first active air intake grille opening, when the vehicle speed is higher than the vehicle speed threshold (80km / h), the first active air intake grille opening decreases with the increase of vehicle speed, when the speed is low, the wind resistance is small, at this time more consideration is given to the needs of thermal management, the higher the cooling fan speed, the larger the active air intake grille opening should be to increase the heat dissipation, but when the vehicle speed is high, the wind resistance is large at this time, so the active air intake grille opening is reduced with the increase of vehicle speed. Read the active air intake grille opening corresponding to the current cooling fan speed and vehicle speed from the cooling fan speed-vehicle speed-active air intake grille opening mapping table, and use the current active air intake grille opening read as the opening of the first active air intake grille.

[0068] (2) When the vehicle air conditioner is in a cooling condition, the opening of the second active air intake grille required for the cooling condition 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 an embodiment of the present 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 by the current vehicle speed and the working pressure of the vehicle air conditioner is determined, and the active air intake grille opening is used as the second active air intake grille opening.

[0070] In an embodiment of the present invention, a vehicle air-conditioning working pressure-vehicle speed-cooling fan speed mapping table is first constructed, and the cooling fan speeds corresponding to different vehicle air-conditioning working pressures at different vehicle speeds are calibrated. When driving at a low speed (vehicle speed is lower than 20 km / h), the greater the working pressure of the vehicle air-conditioning, the higher the required speed of the cooling fan; when driving at a non-low speed, 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, and 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 dissipating heat, thereby increasing the efficiency of heat dissipation, it is necessary to determine the speed of the cooling fan before determining the opening of the active air intake grille.

[0071] The current vehicle speed and vehicle air conditioning working pressure are read, and the cooling fan speed corresponding to the current vehicle speed and vehicle air conditioning working pressure is determined based on a vehicle air conditioning working pressure-vehicle speed-cooling fan speed mapping table.

[0072] In the embodiment of the present invention, a vehicle air conditioner working pressure-vehicle speed-active air intake grille opening mapping table is constructed to calibrate the active air intake grille opening corresponding to different vehicle air conditioner working pressures at different vehicle speeds; when driving at low speed (speed is less than or equal to 50km / h), the active air intake grille is controlled to be fully opened, at this time, the heat can be fully dissipated and the wind resistance generated is small; the opening of the active air intake grille decreases with the increase of the vehicle speed, and when driving at non-low speed, the opening of the active air intake grille increases with the increase of the vehicle air conditioner working pressure. The current vehicle speed and vehicle air conditioner working pressure are read, and the active air intake grille opening corresponding to the current vehicle speed and vehicle air conditioner working pressure is read based on the vehicle air conditioner working pressure-vehicle speed-active air intake grille opening, and 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 a heating condition, the opening of the third active air intake grille required for the heating condition is determined based on the current fan speed and vehicle speed.

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

[0075] In the embodiment of the present invention, a mapping table of circulating fluid temperature-cooling fan speed is first constructed to calibrate the cooling fan speed required 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 read based on the circulating fluid temperature-cooling fan speed mapping table.

[0076] In the embodiment of the present invention, a cooling fan speed-vehicle speed-active air intake grille opening mapping table is first constructed, and 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 with the increase of vehicle speed. When driving at low speed (speed is less than or equal to 60km / h), the active air intake grille is fully open. When driving at non-low speed, the opening of the active air intake grille increases with the increase of the cooling fan speed. The current vehicle speed and the speed of the cooling fan 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, and 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 started, the first active air intake grille opening is used as the final active air intake grille opening; when the vehicle air conditioner is started, if the vehicle air conditioner is in a cooling condition, the larger value of the first active air intake grille opening and the second active air intake grille opening is used as the opening of the active air intake grille; if the vehicle air conditioner is in a heating condition, the larger value of the first active air intake grille opening and the third active air intake grille opening is used as the opening of the active air intake grille.

[0078] The present invention designs a control strategy corresponding to the opening of the active air intake grille for thermal management control of the point motor, battery, and vehicle air conditioner under different working conditions, and reduces the wind resistance of the air intake grille as much as possible while meeting the opening of the active air intake grille required for thermal management.

[0079] Figure 2 The structural diagram of the opening control system of the active air intake grille provided by the embodiment of the present invention, for the convenience of description, only the part related to the embodiment of the present invention is shown, the system comprises:

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

[0081] A temperature sensor for collecting ambient temperature, which is communicatively connected with the first controller;

[0082] Active air intake grille, communicating with the second controller

[0083] The first controller reads the current ambient temperature, vehicle speed and working pressure of the vehicle air conditioner in real time, and determines the opening of the active air intake grille based on the above-mentioned active air intake grille opening control method, and sends the determined active air intake grille opening to the second controller, and the second controller controls the opening of the active air intake grille to the currently determined active air intake grille opening.

[0084] The present invention also provides an electric vehicle, which is integrated with 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 opening of the active air intake grille required for thermal management, the wind resistance of the air intake grille is reduced as much as possible.

[0085] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0086] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for controlling the opening of an active air intake grille, characterized in that: The method is specifically as follows: After the vehicle is started, detect whether the vehicle air conditioner is currently started; If the detection result is no, the first active air intake grille opening required for thermal management of the motor, the battery and the 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 conditioner is in cooling condition, the opening of the first active air intake grille and the opening of the second active air intake grille are integrated to form the opening of the active air intake grille; when the vehicle air conditioner is in heating condition, the opening of the first active air intake grille and the opening of the third active air intake grille are integrated to form the opening of the active air intake grille; The second active air intake grille opening is the active air intake grille opening required for the cooling condition, and the third active air intake grille opening is the active air intake grille opening required for the heating condition.

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

3. The method for controlling the opening of the active air intake grille according to claim 2, characterized in that: The specific process of determining the circulating fluid target temperature AC_Set 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 maintains the lowest temperature. Determine the current ambient temperature and read the current 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 according to claim 1, characterized in that: The minimum value of the circulating fluid target temperature AC_Set, the circulating fluid target temperature Bat_Set and the circulating fluid target temperature Mot_Set is taken as the final circulating fluid temperature T_Target.

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

6. The method for controlling the opening of the active air intake grille according to claim 5, characterized in that: The specific process of determining the speed of the cooling fan is as follows: A mapping table of vehicle air conditioner working pressure-vehicle speed-cooling fan speed is constructed. When the vehicle is driving at a low speed, the greater the working pressure of the vehicle air conditioner, the higher the required speed of the cooling fan. When the vehicle is not driving at a low speed, when the working pressure of the vehicle air conditioner is lower than the set pressure threshold, the speed of the cooling fan is set to zero. When the working pressure of the vehicle air conditioner is higher than the set pressure threshold, the cooling fan is set to a larger speed value, wherein the pressure threshold increases with the increase of the vehicle speed. The cooling fan speed under the current vehicle speed and the vehicle air conditioning working pressure is determined based on the vehicle air conditioning working pressure-vehicle speed-cooling fan speed mapping table.

7. The method for controlling the opening of the active air intake grille according to claim 5, characterized in that: The process of determining the opening of the second active air intake grille is as follows: The vehicle air conditioning working pressure-vehicle speed-active air intake grille opening mapping table controls the active air intake grille to be fully opened when driving at low speed, 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 vehicle air conditioning working pressure increases. The active air intake grille opening corresponding to the current vehicle speed and the vehicle air conditioning working pressure is read based on the vehicle air conditioning working pressure-vehicle speed-active air intake grille opening, and the currently read active air intake grille opening is used as the second air intake grille opening.

8. The method for controlling the opening of the active air intake grille according to claim 1, characterized in that: The method for determining the opening of the third active air intake grille is as follows: The rotation speed of the cooling fan is determined based on the circulating fluid temperature T_Target, the current rotation speed of the cooling fan and the active air intake grille opening required for the current vehicle speed are determined, and 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 according to claim 8, characterized in that: The specific process of determining the speed of the cooling fan is as follows: Construct a mapping table of circulating fluid temperature-cooling fan speed, and the speed of the cooling fan increases as the circulating fluid temperature T_Targe increases; Based on the circulating fluid temperature-cooling fan speed mapping table, the cooling fan speed at the current circulating fluid temperature T_Targe is read.

10. The method for controlling the opening of the active air intake grille according to claim 8, characterized in that: The method for determining the opening of the third active air intake grille is as follows: Construct a cooling fan speed-vehicle speed-active air intake grille opening mapping table. 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 at the current vehicle speed and the speed of the cooling fan is read from the cooling fan speed-vehicle speed-active air intake grille opening 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 comprises: A first controller and a second controller, wherein the first controller is communicatively connected with the second controller; A temperature sensor for collecting ambient temperature, which is communicatively connected with the first controller; Active air intake grille, communicating with the second controller The first controller reads the current ambient temperature, vehicle speed and working pressure of the vehicle air conditioner in real time, and determines the opening of the active air intake grille based on the opening control method of the active air intake grille described in any one of claims 1 to 10, and sends the determined opening of the active air intake grille to the second controller, and the second controller controls the opening of the active air intake grille to the currently determined opening of the active air intake grille.

12. An electric vehicle, characterized in that: The electric vehicle is integrated with the active air intake grille opening control system as claimed in claim 11.

Images