An active intake grille opening control method, device and vehicle for an automobile

Abstract

The present invention provides a method for controlling the opening of an active air intake grille of an automobile, comprising: step S1, obtaining a real-time vehicle speed and a real-time ambient temperature outside the vehicle; step S2, determining, based on the obtained real-time vehicle speed and real-time ambient temperature outside the vehicle, the grille openings corresponding to different fan gear positions; step S3, sequentially calculating, based on each grille opening, a wind resistance energy consumption difference ΔCdP corresponding to two adjacent fan gear positions; step S4, comparing each wind resistance energy consumption difference ΔCdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gear positions, to determine a first grille opening; step S5, determining, based on the obtained real-time vehicle speed and real-time ambient temperature outside the vehicle, a second grille opening that meets performance requirements of an air conditioning system and a cooling system; and step S6, taking the larger of the first and second grille openings and outputting the larger of the first and second grille openings as the final output opening of the active air intake grille.

Description

Technical Field

[0001] The present invention is used for an active air intake grille of a motor vehicle, and more specifically relates to a method and device for controlling the opening of an active air intake grille of an automobile, and an automobile. Background Art

[0002] With energy and environmental issues becoming increasingly severe, the development of automotive energy-saving technologies is urgent, leading to the emergence of active grilles. Research on active grilles primarily focuses on the grille structure (the grille itself and related components) and the grille control system (control logic and related hardware). Current patents related to active grille control systems primarily focus on vehicle performance, for example:

[0003] CN112537197B discloses a control method, device, apparatus, and storage medium for an active air intake grille. The method includes: obtaining vehicle alarm information, active air intake grille status information, and vehicle status information during vehicle driving; detecting whether the vehicle is in normal driving based on the vehicle alarm information, active air intake grille status information, and vehicle status information; determining a real-time switching mode corresponding to the vehicle's active air intake grille from among alternative switching modes based on the vehicle status information when the vehicle is detected to be in normal driving; and controlling the opening angle of the active air intake grille vanes based on the real-time switching mode. The method allows precise control of the opening angle of the active air intake grille vanes based on the real-time information during normal vehicle driving, thereby rationally controlling the air flow entering the engine compartment based on actual needs.

[0004] CN111098700B discloses a control method for an active air intake grille. The method includes: determining whether a front collision warning signal has been detected; if so, determining the opening angle of the grille blades based on their position; and if the opening angle is not fully open, controlling the grille blades to their maximum opening angle. This prevents the AGS grille blades from being unable to fully open after a collision, potentially reducing engine compartment heat dissipation and even the risk of a vehicle fire. Furthermore, it reduces driver safety risks.

[0005] The defects of the above two solutions are as follows: 1. The energy consumption benefits of the active air intake grille and the fan energy consumption are not comprehensively optimized; 2. The air conditioning system, engine cooling system and grille energy consumption are not designed in a multi-level manner to optimize the performance of the air conditioning system, the engine cooling system and the energy consumption benefits of the grille; 3. There is no preventive design for the possibility of ice formation on the grille in low temperature environments in winter; 4. There is no optimization design for possible failure or jamming of the grille. Summary of the Invention

[0006] The purpose of the present invention is to provide a method, device and vehicle for controlling the opening of an active air intake grille on a vehicle. By coupling the real-time acquisition of relevant operating parameter information during vehicle driving (including signals such as the external ambient temperature and vehicle speed) with the drag coefficient of different grille openings obtained through three-dimensional simulation, the drag gain and fan energy consumption are optimized. On the basis of taking into account the performance of the vehicle's air conditioning system and cooling system and the safety of the cabin from heat damage, an active air intake grille control logic with optimal energy consumption is designed.

[0007] The technical solution of the present invention is:

[0008] The present invention provides a method for controlling the opening of an active air intake grille of an automobile, comprising:

[0009] Step S1, obtaining the current actual grille opening of the active air intake grille, as well as the real-time vehicle speed, the real-time external ambient temperature, the air conditioning high pressure, the air conditioning on / off status, and the engine water temperature;

[0010] Step S2: determining the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and real-time ambient temperature outside the vehicle;

[0011] Step S3, calculating the windage energy consumption difference ΔCdP corresponding to two adjacent fan gear positions according to the opening of each grille;

[0012] Step S4, comparing each wind resistance energy consumption difference ΔCdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gears, to determine the first grille opening;

[0013] Step S5, determining a second grille opening that meets the air conditioning system performance requirements based on the acquired air conditioning high pressure and air conditioning on / off status;

[0014] Step S6, determining a third grid opening that meets the engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed;

[0015] Step S7, outputting a first target grille opening according to the larger of the first grille opening and the third grille opening;

[0016] Step S8, outputting a second target grille opening that meets anti-icing requirements based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening;

[0017] Step S9: Using the second target grille opening as the final required grille opening to control the active air intake grille.

[0018] Preferably, step S3 of sequentially calculating the windage energy consumption difference ΔCdP of the fan at two adjacent gear positions according to the openings of the respective grilles includes:

[0019] Step S31, determining the drag coefficient Cd corresponding to the fan operating at different gears according to the opening of each grille;

[0020] Step S32, calculating the absolute value ΔCd of the drag coefficient difference between two adjacent gears according to each drag coefficient Cd;

[0021] In step S33, based on the absolute value of the difference between the drag coefficients ΔCd, the difference in wind resistance energy consumption ΔCdP corresponding to two adjacent gear positions of the fan is calculated in sequence.

[0022] Preferably, each wind resistance energy consumption difference ΔCdP is compared with the fan energy consumption when the fan is running in the higher gear of the corresponding two gears, and step S4 of determining the first grille opening includes:

[0023] Step S41 , comparing the fan energy consumption difference ΔCdP corresponding to two adjacent gears with their corresponding fan energy consumption P in descending order of the fan energy consumption difference;

[0024] Step S42: If one or more fan energy consumption difference values ΔCdP are less than or equal to the corresponding fan energy consumption P, a first target fan energy consumption difference value ranked first among the one or more fan energy consumption difference values ΔCdP is determined, and a grille gradient when the fan is operating at a lower gear of two gears corresponding to the first target fan energy consumption difference value is determined as a first grille gradient;

[0025] In step S43, if there is not one or more fan energy consumption difference values △CdP that are less than or equal to the corresponding fan energy consumption P, then determine the second target fan energy consumption difference value ranked last from all the fan energy consumption difference values, and then determine the grille gradient when the fan is operating in the higher gear of the two gears corresponding to the second target fan energy consumption difference value as the first grille gradient.

[0026] Preferably, the step S2 of determining the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and the real-time ambient temperature outside the vehicle comprises:

[0027] According to the stored predetermined correspondence table of the current vehicle speed, the outside ambient temperature, the fan gear and the minimum grille opening required to maintain the fan at each fan gear, the table is looked up to confirm the grille opening corresponding to the real-time vehicle speed, the real-time outside ambient temperature and different fan gears.

[0028] Preferably, the step S5 of determining the second grille opening that meets the air conditioning system performance requirements based on the acquired air conditioning high pressure and air conditioning on / off state includes:

[0029] If the air conditioner is in the on state, the second grille opening is determined by looking up a table according to a predetermined correspondence table between the air conditioner high pressure pressure and the second grille opening;

[0030] If the air conditioner is off, confirm that the second grille opening is 0;

[0031] The step S6 of determining the third grille opening that meets the engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed includes:

[0032] The third grille opening is confirmed by looking up a table according to a predetermined correspondence table of the engine water temperature, the real-time vehicle speed and the third grille opening.

[0033] Preferably, the fan energy consumption difference ΔCdP is calculated by the formula:

[0034] ΔCdP=0.5*ρ*ΔCd*A*v 3

[0035] Calculated, where ρ is the air density kg / m³, ΔCd is the absolute value of the drag coefficient difference, and A is the frontal area of the fan.

[0036] Preferably, step S8 of outputting a second target grille opening that meets the anti-icing requirement based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening includes:

[0037] If the real-time ambient temperature outside the vehicle is less than or equal to the preset target temperature, determining whether the duration for which the active air intake grille operates according to the first target grille opening exceeds a first preset duration;

[0038] If the first preset time period is exceeded, a plurality of target grille openings from the first target grille opening to the maximum preset grille opening and from the maximum preset grille opening to the minimum preset grille opening are sequentially determined as the second target grille opening; the plurality of target grille openings include: a plurality of grille openings that are gradually increased to the maximum preset grille opening according to a preset gradient starting from the first target grille opening, and a plurality of grille openings that are gradually decreased to the minimum preset grille opening according to a preset gradient starting from the maximum preset grille opening;

[0039] If the real-time ambient temperature outside the vehicle is greater than the preset target temperature, or if the duration does not exceed a first preset duration, the first target grille opening is determined as the second target grille opening.

[0040] Preferably, the method further comprises:

[0041] Step S10, determining whether the current actual grille opening of the active air intake grille is equal to the second target grille opening;

[0042] Step S11: if the duration during which the current actual grille opening is not equal to the second target grille opening exceeds a second preset duration, then increasing the active air intake grille torque based on the current active air intake grille torque and controlling the active air intake grille to cycle open and close a predetermined number of times;

[0043] Step S12: If the active air intake grille cannot be opened and closed for the predetermined number of cycles, the active air intake grille is restored to its original torque and an alarm message is output;

[0044] Step S13 : If the active air intake grille can be cyclically opened and closed a predetermined number of times, when the current actual grille opening of the active air intake grille changes to be equal to the second target grille opening, the active air intake grille is restored to its original torque.

[0045] The present invention also provides a vehicle active air intake grille opening control device, comprising:

[0046] The parameter acquisition module is used to obtain the current actual grille opening of the active air intake grille, as well as the real-time vehicle speed, real-time external ambient temperature, air conditioning high pressure, air conditioning on / off status, and engine water temperature;

[0047] A grille opening determination module is used to determine the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and real-time ambient temperature outside the vehicle;

[0048] The wind resistance energy consumption difference determination module is used to calculate the wind resistance energy consumption difference △CdP corresponding to two adjacent fan gears according to the opening of each grille;

[0049] A first grille opening determination module is configured to compare each wind resistance energy consumption difference △CdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gears to determine the first grille opening;

[0050] a second grille opening determination module, configured to determine a second grille opening that meets the performance requirements of the air conditioning system based on the acquired air conditioning high pressure pressure and the air conditioning on / off state;

[0051] a third grille opening determination module, configured to determine a third grille opening that satisfies engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed;

[0052] a first target grille opening output module, configured to output a first target grille opening according to the larger of the first grille opening and the third grille opening;

[0053] a second target grille opening output module, configured to output a second target grille opening that meets an anti-icing requirement based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening;

[0054] The grille control module is configured to control the active air intake grille by using the second target grille opening as the final required grille opening.

[0055] The present invention also provides an automobile, comprising the above-mentioned automobile active air intake grille control device.

[0056] The beneficial effects of the present invention are:

[0057] By acquiring relevant operating parameter information during vehicle driving in real time (including signals such as the external ambient temperature and vehicle speed) and coupling it with the drag coefficient of different grille openings obtained through 3D simulation, the drag gain and fan energy consumption are optimized. Taking into account the performance of the vehicle's air-conditioning and cooling systems and the safety of the cabin from heat damage, an active air intake grille control logic with optimal energy consumption is designed. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a flow chart of the active air intake grille control method in this embodiment;

[0059] Figure 2 This is a principle block diagram of the active air intake grille control device in this embodiment. DETAILED DESCRIPTION

[0060] The present invention will be described in detail below with reference to the accompanying drawings.

[0061] See also Figure 1 This embodiment provides a method for controlling the opening of an active air intake grille of an automobile, which includes the following steps:

[0062] S101, obtaining the real-time vehicle speed and the real-time ambient temperature outside the vehicle from the vehicle controller, and calculating different grille openings at different expected fan gears based on the real-time vehicle speed and the real-time ambient temperature outside the vehicle.

[0063] For each expected fan position, a grille opening MAP table corresponding to the real-time vehicle speed and real-time outside ambient temperature is designed. This table can be obtained through CAE simulation or experimental calibration. The corresponding grille opening is then determined using the MAP table based on the vehicle's current speed and real-time outside ambient temperature. In this embodiment of the present invention, based on the fan having three gears: OFF, low speed, and high speed (in actual use, operating conditions must be adjusted based on actual conditions; in particular, for non-gear PWM fans, the fan gears must be replaced with a number of PWM duty cycles), three corresponding grille openings, namely, Grille Opening 1, Grille Opening 2, and Grille Opening 3, are obtained using MAP Table 1. (Note: For example, if the fan is expected to be in the OFF position, the function of the MAP table is to determine the minimum grille opening (i.e., Grille Opening 1) that maintains the fan in the OFF position at a certain real-time vehicle speed and real-time outside ambient temperature).

[0064] S102 , converting the different grille openings obtained in S101 into drag coefficients Cd under corresponding working conditions, and then performing difference calculation based on the different Cd values.

[0065] Through 3D simulation, a drag coefficient Cd MAP table corresponding to different grille openings is generated. Based on the different grille openings obtained in S1 (Grille Opening 1, Grille Opening 2, and Grille Opening 3), the corresponding drag coefficients Cd1, Cd2, and Cd3 are obtained from the drag coefficient Cd MAP table. The difference is then calculated to obtain the absolute value of the drag coefficient difference, ΔCd, where ΔCd1 = |Cd1 - Cd2| and ΔCd2 = |Cd2 - Cd3|.

[0066] S103 , calculating the wind resistance energy consumption difference ΔCdP of each corresponding Cd value based on the absolute value of the drag coefficient difference ΔCd obtained in S102 , and optimizing the difference with the fan energy consumption at different fan gears.

[0067] According to ΔCd1 and ΔCd2 obtained in S102, the power calculation formula ΔCdP=0.5*ρ*ΔCd*A*v 3 (ρ: air density kg / m³, ΔCd: absolute value of drag coefficient difference, A: fan frontal area m2, ρ: vehicle speed m / s) The fan energy consumption differences ΔCdP1 and ΔCdP2 are calculated, respectively. This fan energy consumption difference ΔCdP can be considered the benefit of reducing wind resistance. Energy consumption optimization is a two-step process. The first step is to subtract ΔCdP1 from the fan energy consumption P1 at low fan speed. If ΔCdP1 ≤ P1, the energy gain from reducing the grille opening ratio to reduce wind resistance is less than or equal to the energy consumption at low fan speed. In this case, the grille opening 1, which results in a drag coefficient of Cd1, is selected as the output. If ΔCdP1>P1, the second step of energy consumption optimization is entered. The difference between ΔCdP2 and the fan energy consumption P2 when the fan is running at high speed is calculated. If ΔCdP2≤P2, it means that the energy consumption benefit of further reducing the grille opening ratio to reduce wind resistance is less than or equal to the energy consumption P2 when the fan is running at high speed. In this case, the grille opening 2 with a drag coefficient of Cd2 is selected as the output. If ΔCdP2>P2, it means that the energy consumption benefit of further reducing the grille opening ratio to reduce wind resistance is greater than the energy consumption P2 when the fan is running at high speed. In this case, the grille opening 3 with a drag coefficient of Cd3 is selected as the output. By using the two energy consumption differences, the grille opening with the optimal energy consumption is finally selected as the output, which is the first grille opening required by this application.

[0068] The fan energy consumption P1 when the fan is running at a low speed and the fan energy consumption P2 when the fan is running at a high speed are determined according to a parameter table of the fan.

[0069] In summary, when the fan is a non-gear PWM fan, the principle for selecting the grille opening is: in the order of fan energy consumption difference from low to high, compare the fan energy consumption difference △CdP corresponding to two adjacent gears with their corresponding fan energy consumption P;

[0070] If one or more fan energy consumption difference values △CdP are less than or equal to the corresponding fan energy consumption P, a first target fan energy consumption difference value ranked first among the one or more fan energy consumption difference values △CdP is determined, and a grille gradient when the fan is operated at a lower gear of two gears corresponding to the first target fan energy consumption difference is determined as a first grille gradient;

[0071] If there is not one or more fan energy consumption difference values △CdP that are less than or equal to the corresponding fan energy consumption P, then the second target fan energy consumption difference value ranked last is determined from all the fan energy consumption differences, and then the grille gradient when the fan is operating in the higher gear of the two gears corresponding to the second target fan energy consumption difference is determined as the first grille gradient.

[0072] S104 , determining a second grille opening that meets the performance requirements of the air conditioning system based on the acquired air conditioning high pressure pressure and the air conditioning on / off state.

[0073] The vehicle controller obtains real-time A / C high-pressure pressure and A / C on / off status. When the A / C is on (i.e., in the ON position), the second grille opening is calculated using MAP Table 2 (i.e., A / C high-pressure pressure - second grille opening MAP) corresponding to the A / C high-pressure pressure. This MAP table can be obtained through experimental calibration. When the A / C is off (i.e., in the OFF position), the second grille opening is output as a constant 0, indicating that air conditioning demand is not considered at this time.

[0074] S105 , determining a third grille opening that meets the engine thermal management requirement based on the acquired engine water temperature and real-time vehicle speed.

[0075] The real-time engine water temperature and the real-time vehicle speed are obtained from the vehicle controller, and the third grille opening is calculated using MAP Table 3 (i.e., engine water temperature-real-time vehicle speed-third grille opening MAP) related to the engine water temperature and the real-time vehicle speed.

[0076] S106 , outputting a first target grille opening based on the larger of the first grille opening and the third grille opening.

[0077] S107 , outputting a second target grille opening that meets an anti-icing requirement based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening.

[0078] S107 specifically includes:

[0079] If the real-time ambient temperature outside the vehicle is less than or equal to the preset target temperature, determining whether the duration for which the active air intake grille operates according to the first target grille opening exceeds a first preset duration;

[0080] If the first preset time period is exceeded, a plurality of target grille openings from the first target grille opening to the maximum preset grille opening and from the maximum preset grille opening to the minimum preset grille opening are sequentially determined as the second target grille opening; the plurality of target grille openings include: a plurality of grille openings that are gradually increased to the maximum preset grille opening according to a preset gradient starting from the first target grille opening, and a plurality of grille openings that are gradually decreased to the minimum preset grille opening according to a preset gradient starting from the maximum preset grille opening;

[0081] If the real-time ambient temperature outside the vehicle is greater than the preset target temperature, or if the duration does not exceed a first preset duration, the first target grille opening is determined as the second target grille opening.

[0082] Specifically, if the real-time outside ambient temperature T is less than or equal to the preset target temperature T0 (e.g., 0°C), and the first target grille opening output in step S106 remains at the same value (e.g., 12°) for more than 60 seconds, the grille is determined to be at risk of icing. The grille then undergoes an anti-icing cycle (e.g., fully open (90°) - fully closed (0°) once, each cycle completed). After the cycle, the first grille opening requirement is restored. If the ambient temperature T exceeds the preset value T0 (e.g., 0°C), the anti-icing requirement is not implemented, and the second grille opening is equal to the first target grille opening.

[0083] Step S108 : Using the second target grille opening as the final required grille opening to control the active air intake grille.

[0084] Step S109, determining whether the current actual grille opening of the active air intake grille is equal to the second target grille opening;

[0085] Step S110: If the duration during which the current actual grille opening is not equal to the second target grille opening exceeds a second preset duration, the active air intake grille torque is increased based on the current active air intake grille torque, and the active air intake grille is controlled to cycle open and close a predetermined number of times;

[0086] Step S111: If the active air intake grille cannot be opened and closed for a predetermined number of cycles, the active air intake grille is restored to its original torque and an alarm message is output;

[0087] Step S112 : If the active air intake grille can be cyclically opened and closed a predetermined number of times, when the current actual grille opening of the active air intake grille changes to be equal to the second target grille opening, the active air intake grille is restored to its original torque.

[0088] If the current actual grille opening is ≠ the second target grille opening, and the duration t is ≥ the second preset duration t0 (e.g., 10 seconds), the grille is determined to be faulty or stuck. The grille motor torque is increased (e.g., if the original torque is 5N, increase it by 1N) and the grille is opened and closed three times in an attempt to remove the obstruction. If the grille fails to complete the three opening and closing cycles, the grille is determined to be faulty or the obstruction has not been removed, and an alarm is issued (and the grille motor torque is restored to its original value). If the grille completes the three opening and closing cycles, the grille is determined to be normal or the obstruction has been removed, and the system enters the normal state and executes the second target grille opening requirement (motor torque) in step S107. If the current actual grille opening is equal to the second target grille opening, and the duration t is less than the second preset duration t0 (e.g., 10 seconds), the grille is opening and closing normally, and the second target grille opening requirement is executed normally.

[0089] Reference Figure 2 The present invention also provides a vehicle active air intake grille control device, comprising:

[0090] Parameter acquisition module 101, used to obtain the current actual grille opening of the active air intake grille, as well as the real-time vehicle speed, real-time external ambient temperature, air conditioning high pressure, air conditioning on / off status, and engine water temperature;

[0091] A grille opening determination module 102 is configured to determine the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and real-time ambient temperature outside the vehicle;

[0092] The wind resistance energy consumption difference determination module 103 is used to calculate the wind resistance energy consumption difference ΔCdP corresponding to two adjacent fan gears according to the opening of each grille;

[0093] A first grille opening determination module 104 is configured to compare each windage energy consumption difference ΔCdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gears to determine the first grille opening;

[0094] A second grille opening determination module 105 is configured to determine a second grille opening that satisfies the air conditioning system performance requirements based on the acquired air conditioning high pressure and air conditioning on / off status;

[0095] A third grille opening determination module 106 is configured to determine a third grille opening that satisfies the engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed;

[0096] A first target grille opening output module 107 is configured to output a first target grille opening according to the larger of the first grille opening and the third grille opening;

[0097] A second target grille opening output module 108 is configured to output a second target grille opening that meets anti-icing requirements based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening;

[0098] The grille control module 109 is configured to control the active air intake grille by taking the second target grille opening as the final required grille opening.

[0099] The present invention also provides an automobile, comprising the above-mentioned automobile active air intake grille control device.

[0100] The above description is merely an example of implementation of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling the opening of an active air intake grille of an automobile, characterized in that: include: Step S1, obtaining the current actual grille opening of the active air intake grille, as well as the real-time vehicle speed, the real-time external ambient temperature, the air conditioning high pressure, the air conditioning on / off status, and the engine water temperature; Step S2: determining the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and real-time ambient temperature outside the vehicle; Step S3, calculating the windage energy consumption difference ΔCdP corresponding to two adjacent fan gear positions according to the opening of each grille; Step S4, comparing each wind resistance energy consumption difference ΔCdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gears to determine the first grille opening; Step S5, determining a second grille opening that meets the air conditioning system performance requirements based on the acquired air conditioning high pressure and air conditioning on / off status; Step S6, determining a third grille opening that meets the engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed; Step S7, outputting a first target grille opening according to the larger of the first grille opening and the third grille opening; Step S8, outputting a second target grille opening that meets anti-icing requirements based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening; Step S9: Using the second target grille opening as the final required grille opening to control the active air intake grille.

2. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: Step S3 of sequentially calculating the windage energy consumption difference ΔCdP corresponding to two adjacent fan gear positions according to the grille openings includes: Step S31, determining the drag coefficient Cd corresponding to the fan operating at different gears according to the opening of each grille; Step S32, calculating the absolute value ΔCd of the drag coefficient difference between two adjacent gears according to each drag coefficient Cd; In step S33, based on the absolute value of the difference between the drag coefficients ΔCd, the difference in wind resistance energy consumption ΔCdP corresponding to two adjacent gear positions of the fan is calculated in sequence.

3. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: The step S4 of determining the first grille opening by comparing each wind resistance energy consumption difference ΔCdP with the fan energy consumption when the fan is running at the higher of the two corresponding gears includes: Step S41 , comparing the fan energy consumption difference ΔCdP corresponding to two adjacent gears with their corresponding fan energy consumption P in descending order of the fan energy consumption difference; Step S42: If one or more fan energy consumption difference values ΔCdP are less than or equal to the corresponding fan energy consumption P, a first target fan energy consumption difference value ranked first among the one or more fan energy consumption difference values ΔCdP is determined, and a grille gradient when the fan is operating at a lower gear of two gears corresponding to the first target fan energy consumption difference value is determined as a first grille gradient; In step S43, if there is not one or more fan energy consumption difference values △CdP that are less than or equal to the corresponding fan energy consumption P, then determine the second target fan energy consumption difference value ranked last from all the fan energy consumption difference values, and then determine the grille gradient when the fan is operating in the higher gear of the two gears corresponding to the second target fan energy consumption difference value as the first grille gradient.

4. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: The step S2 of determining the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and the real-time ambient temperature outside the vehicle includes: According to the stored predetermined correspondence table of the current vehicle speed, the outside ambient temperature, the fan gear and the minimum grille opening required to maintain the fan at each fan gear, the table is looked up to confirm the grille opening corresponding to the real-time vehicle speed, the real-time outside ambient temperature and different fan gears.

5. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: The step S5 of determining the second grille opening that meets the air conditioning system performance requirements based on the acquired air conditioning high pressure and the air conditioning on / off state includes: If the air conditioner is in the on state, the second grille opening is determined by looking up a table according to a predetermined correspondence table between the air conditioner high pressure pressure and the second grille opening; If the air conditioner is off, confirm that the second grille opening is 0; The step S6 of determining the third grille opening that meets the engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed includes: The third grille opening is confirmed by looking up a table according to a predetermined correspondence table of the engine water temperature, the real-time vehicle speed and the third grille opening.

6. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: The fan energy consumption difference ΔCdP is calculated by the formula: ΔCdP=0.5*ρ*ΔCd*A*v 3 Calculated, where ρ is the air density kg / m³, ΔCd is the absolute value of the drag coefficient difference, and A is the frontal area of the fan.

7. The method for controlling the opening of an active air intake grille of an automobile according to claim 1, characterized in that: The step S8 of outputting a second target grille opening that meets the anti-icing requirement based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening includes: If the real-time ambient temperature outside the vehicle is less than or equal to the preset target temperature, determining whether the duration for which the active air intake grille operates according to the first target grille opening exceeds a first preset duration; If the first preset time period is exceeded, a plurality of target grille openings from the first target grille opening to the maximum preset grille opening and from the maximum preset grille opening to the minimum preset grille opening are sequentially determined as the second target grille opening; the plurality of target grille openings include: a plurality of grille openings that are gradually increased to the maximum preset grille opening according to a preset gradient starting from the first target grille opening, and a plurality of grille openings that are gradually decreased to the minimum preset grille opening according to a preset gradient starting from the maximum preset grille opening; If the real-time ambient temperature outside the vehicle is greater than the preset target temperature, or if the duration does not exceed a first preset duration, the first target grille opening is determined as the second target grille opening.

8. The method according to claim 1, characterized in that The method further comprises: Step S10, determining whether the current actual grille opening of the active air intake grille is equal to the second target grille opening; Step S11: if the duration during which the current actual grille opening is not equal to the second target grille opening exceeds a second preset duration, then increasing the active air intake grille torque based on the current active air intake grille torque and controlling the active air intake grille to cycle open and close a predetermined number of times; Step S12: If the active air intake grille cannot be opened and closed for the predetermined number of cycles, the active air intake grille is restored to its original torque and an alarm message is output; Step S13 : If the active air intake grille can be cyclically opened and closed a predetermined number of times, when the current actual grille opening of the active air intake grille changes to be equal to the second target grille opening, the active air intake grille is restored to its original torque.

9. An automobile active air intake grille opening control device, characterized in that: include: The parameter acquisition module is used to obtain the current actual grille opening of the active air intake grille, as well as the real-time vehicle speed, real-time external ambient temperature, air conditioning high pressure, air conditioning on / off status, and engine water temperature; A grille opening determination module is used to determine the grille opening corresponding to different fan gear positions based on the acquired real-time vehicle speed and real-time ambient temperature outside the vehicle; The wind resistance energy consumption difference determination module is used to calculate the wind resistance energy consumption difference △CdP corresponding to two adjacent fan gears according to the opening of each grille; A first grille opening determination module is configured to compare each wind resistance energy consumption difference △CdP with the fan energy consumption when the fan is operating in the higher of the two corresponding gears to determine the first grille opening; a second grille opening determination module, configured to determine a second grille opening that meets the performance requirements of the air conditioning system based on the acquired air conditioning high pressure pressure and the air conditioning on / off state; a third grille opening determination module, configured to determine a third grille opening that satisfies engine thermal management requirements based on the acquired engine water temperature and real-time vehicle speed; a first target grille opening output module, configured to output a first target grille opening according to the larger of the first grille opening and the third grille opening; a second target grille opening output module, configured to output a second target grille opening that meets an anti-icing requirement based on the acquired real-time ambient temperature outside the vehicle and the first target grille opening; The grille control module is configured to control the active air intake grille by using the second target grille opening as the final required grille opening.

10. An automobile, characterized in that: It includes the automobile active air intake grille opening control device as described in claim 9.

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