Active air inlet grille control method and device, storage medium and vehicle

Abstract

The invention discloses an active air inlet grille control method and device, a storage medium and a vehicle, the vehicle air conditioner pressure, the engine water temperature and the air inlet temperature are obtained, then the target grille opening degree of the vehicle is determined according to the air conditioner pressure, the engine water temperature and the air inlet temperature, and then the active air inlet grille of the vehicle is controlled according to the target grille opening degree; according to the embodiment, the linkage relation of environmental factors, the air conditioner state, the engine state and the active air inlet grille is considered, the accuracy of the opening degree of the target grille is improved, the active air inlet grille control strategy can adapt to different working conditions, the good energy saving and emission reduction effects are achieved, heat management of all structures in the heat management system is also considered, and the heat management efficiency is improved. The potential of energy conservation and emission reduction optimization and heat management optimization of the active air inlet grille is fully played, and therefore the heat management efficiency is improved.

Description

[0001] This application is based on a Chinese invention patent application with the application number "202311537055.1" and the title "Active Intake Grille Control Method, Device, Storage Medium and Vehicle" filed on November 16, 2023, and claims its priority. Technical Field

[0002] The present invention relates to the field of vehicle thermal management, and particularly to an active intake grille control method, device, storage medium and vehicle. Background Art

[0003] According to the strictness of vehicle emission regulations, the pressure on vehicle energy conservation and emission reduction is also increasing. The thermal management system equipped with an active intake grille has become the choice for many fuel and hybrid vehicles. By adjusting the opening degree of the active intake grille, the overall vehicle aerodynamic drag coefficient can be improved to enhance fuel economy, and vehicle thermal management can also be achieved.

[0004] Existing active intake grille control strategies usually calculate the grille opening degree based on ambient temperature, vehicle speed, and fan speed (or duty cycle), and then correct to obtain the target grille opening degree, thereby realizing the opening degree control of the active intake grille. However, there are coupling relationships between the active intake grille and structures such as the air conditioning system, engine, and battery in the thermal management system. The accuracy of the grille opening degree calculated based on ambient temperature, vehicle speed, and fan speed is insufficient, and the active intake grille control strategy is difficult to adapt to different working conditions, unable to fully exert the potential of energy conservation, emission reduction optimization, and thermal management optimization of the active intake grille, resulting in poor thermal management efficiency. Summary of the Invention

[0005] The present invention provides an active intake grille control method, device, storage medium and vehicle to solve the problem that the existing active intake grille control strategy is difficult to adapt to different working conditions, resulting in poor thermal management efficiency.

[0006] In view of the above problems, in the first aspect, an active intake grille control method is provided, including:

[0007] Obtain the air conditioning pressure, engine water temperature, and intake air temperature of the vehicle;

[0008] Determine the target grille opening degree of the vehicle according to the air conditioning pressure, engine water temperature, and intake air temperature;

[0009] Control the active intake grille of the vehicle according to the target grille opening degree.

[0010] In the third aspect, an active intake grille control device is provided, including a vehicle controller and an active grille controller; wherein, the vehicle controller is used for:

[0011] Obtain the air conditioning pressure, engine water temperature, and intake air temperature of the vehicle;

[0012] Determine the target grille opening of the vehicle according to the air-conditioning pressure, engine coolant temperature, and intake air temperature;

[0013] The active grille controller is used to control the active intake grille of the vehicle according to the target grille opening.

[0014] In a third aspect, a readable storage medium is provided. The readable storage medium stores a computer program, characterized in that when the computer program is executed by a processor, the steps of the above-mentioned active intake grille control method are implemented.

[0015] In a fourth aspect, a vehicle is provided. The vehicle includes an active intake grille and an active intake grille control device, and the active intake grille control device is used to execute the steps of the above-mentioned active intake grille control method.

[0016] In one solution provided by the above-mentioned active intake grille control method, device, storage medium, and vehicle, by obtaining the air-conditioning pressure, engine coolant temperature, and intake air temperature of the vehicle, then determining the target grille opening of the vehicle according to the air-conditioning pressure, engine coolant temperature, and intake air temperature, and then controlling the active intake grille of the vehicle according to the target grille opening; in this embodiment, the target grille opening is determined by the air-conditioning pressure, engine coolant temperature, and intake air temperature, and then the active intake grille opening is controlled. Considering the linkage relationship between environmental factors, air-conditioning status, engine status, and the active intake grille, the accuracy of the target grille opening is improved, so that the active intake grille control strategy can adapt to different working conditions, has a good energy-saving and emission-reduction effect, and also takes into account vehicle thermal management, giving full play to the potential of the active intake grille for energy-saving and emission-reduction optimization and thermal management optimization, thereby improving the thermal management efficiency. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of a vehicle in an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a schematic structural diagram of the thermal management system in;

[0020] Figure 3 is Figure 1 a schematic structural diagram of the active intake grille control device in;

[0021] Figure 4It is a flowchart of the active intake grille control method in an embodiment of the present invention;

[0022] Figure 5 It is Figure 4 An implementation flowchart of step S20 in

[0023] Figure 6 It is another flowchart of the active intake grille control method in an embodiment of the present invention;

[0024] Figure 7 It is a judgment logic diagram of the active intake grille control mode in an embodiment of the present invention;

[0025] Figure 8 It is a test result diagram of different fuel-saving solutions in an embodiment of the present invention;

[0026] Figure 9 It is a fuel consumption diagram of different vehicle models in an embodiment of the present invention;

[0027] Figure 10 It is another structural schematic diagram of the active intake grille control device in an embodiment of the present invention. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0029] It should be understood that when used in the specification and appended claims of the present invention, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. It should also be understood that the term " / and" as used in the specification and appended claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In addition, in the description of the specification and appended claims of the present invention, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" etc. described in the specification of the present invention mean that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present invention. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0032] It should be understood that the magnitudes of the sequence numbers of the steps in the following embodiments do not mean the order of execution is prior or posterior. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0033] In order to illustrate the technical solution of the present invention, the following specific embodiments are used for illustration.

[0034] The active intake grille control method provided by the embodiments of the present invention can be applied to vehicles as Figure 1 shown. The vehicle includes an active intake grille and an active intake grille control device. Among them, the active intake grille control device communicates with the active intake grille through the LIN bus to achieve its control. Among them, the vehicle can be a fuel vehicle or a hybrid vehicle (hybrid vehicle).

[0035] It should be understood that the thermal management system of the vehicle includes components such as an air-conditioning circuit, a battery circuit, an engine circuit, a motor circuit, a water pump, a heat exchanger, a compressor, an active intake grille, a plurality of radiators, and a plurality of expansion valves. Among them, the air-conditioning circuit includes an air-conditioning condenser, a liquid storage and dryer, an evaporator, and a compressor, and is used for dissipating heat from the cab; the air-conditioning circuit exchanges heat with the battery cooling circuit through a heat exchanger. The battery circuit includes a water pump, a heater, and a battery, and dissipates heat from the battery in a liquid-cooled manner; the motor circuit (not included in fuel vehicles) includes a low-temperature radiator, a water pump, a motor controller, and a motor to perform liquid-cooled heat dissipation on the motor; the engine circuit includes a high-temperature radiator, a fan, a water pump, and an engine to achieve liquid-cooled and air-cooled heat dissipation of the engine. As Figure 2As shown, in this embodiment, the vehicle is a hybrid vehicle, and its thermal management system has three layers of radiators. The frontmost one is the air conditioner condenser 302, and the active intake grille 301 is arranged in front of the air conditioner condenser 302; the low-temperature radiator 303 is arranged behind the air conditioner condenser 302, the high-temperature radiator 304 is arranged behind the low-temperature radiator 303, and the fan 305 is arranged behind the high-temperature radiator 304. In the air-conditioning circuit, the low-temperature radiator 303 is connected to the liquid receiver dryer 306, and then connected to the expansion valves 312 and 313. The expansion valve 312 is connected to the evaporator 311, and the evaporator 311 is connected to the compressor 320 after that to dissipate heat from the cab; among them, heat exchange is carried out between the air-conditioning circuit and the battery circuit through the heat exchanger 315. In the battery circuit, the heat exchanger 315 is connected to the water pump 317, the water pump 317 is connected to the heater 316, and the heater 316 is connected to the battery 314, adopting a liquid-cooled battery solution. The outlet of the low-temperature radiator 303 is connected to the water pump 321, and then one branch flows through the stop valve 307, flows into the heat exchanger 309, and then returns to the low-temperature radiator 303; the other branch flows through the motor controller 318, and then flows into the motor 319 to form a motor circuit. In the engine circuit, the high-temperature radiator 304 is connected to the water pump 308 behind it, and then enters the engine 310 for liquid cooling. The PWM fan 305 is also arranged behind the high-temperature radiator 304, and the fan speed can be controlled to control the air intake volume, thereby controlling the heat dissipation rate. In the thermal management system of the vehicle in this embodiment, both the active intake grille 301 and the fan 305 can control the heat dissipation rate, and the air intake of the intake grille is preferentially controlled. However, the opening degree of the active intake grille cannot be too large, otherwise it will cause excessive air intake, increase air resistance, and may increase fuel consumption under low-temperature conditions; the opening degree of the active intake grille cannot be too small, otherwise it may increase the fan power or cause the system to overheat.

[0036] It should be understood that the air-conditioning pressure represents the air-conditioning load, which can represent the cooling demand of the occupant compartment and the battery cooling demand of the hybrid vehicle. The greater the air-conditioning load, the greater the opening degree of the active intake grille should be increased to assist heat dissipation. Otherwise, if the air-conditioning load is greater than the upper limit value, the air-conditioning will stop working, and the temperature cooling effect of the air-conditioning refrigerant on the battery and the occupant compartment will be lost. To a certain extent, the engine water temperature represents the engine temperature. The higher the engine water temperature, the greater the cooling demand of the engine. The greater the engine water temperature, the more the opening degree of the active intake grille needs to be increased, so that more air flows through the radiator to strengthen the engine heat dissipation. Otherwise, the engine may overheat and malfunction, resulting in the vehicle being unable to operate normally. The motor water temperature represents the motor temperature of the hybrid vehicle. The higher the motor water temperature, the greater the cooling demand. The greater the generator temperature, the more the opening degree of the active intake grille needs to be increased to dissipate heat from the motor. Otherwise, the motor may overheat and malfunction, resulting in the vehicle being unable to operate normally. The intake air temperature represents the ambient temperature of the vehicle. When the ambient temperature is too high, the temperatures of components such as the engine, air-conditioning, and motor will increase accordingly. Therefore, the higher the ambient temperature, the more the opening degree of the active intake grille needs to be increased to assist the heat dissipation of each component, so as to maintain and ensure the normal operation of the whole vehicle.

[0037] For the above vehicle, in this embodiment, an active intake grille control method is provided, and the active intake grille control device is the actuator of this active intake grille control method. Specifically, during the vehicle operation, the active intake grille control device needs to obtain the air-conditioning pressure, engine water temperature, intake air temperature (and motor water temperature) of the vehicle, and then determine the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature, intake air temperature (and motor water temperature), and then control the active intake grille according to the target grille opening degree. In this embodiment, the target grille opening degree is determined by the air-conditioning pressure, engine water temperature, intake air temperature (and motor water temperature), and then the opening degree of the active intake grille is controlled. Considering the linkage relationship between environmental factors, air-conditioning status, engine status, and motor status and the active intake grille, the accuracy of the target grille opening degree is improved, so that the active intake grille control strategy can adapt to different working conditions, has a good energy-saving and emission-reduction effect, and also takes into account the thermal management of each structure in the vehicle thermal management system, giving full play to the energy-saving and emission-reduction optimization and thermal management optimization potential of the active intake grille, thereby improving the thermal management efficiency.

[0038] In one embodiment, as Figure 3As shown in the figure, the active intake grille control device includes a vehicle controller 10 and an active grille controller 20, and the active grille controller 20 is powered by a low-voltage battery 30. Among them, the vehicle controller 10 communicates with the active grille controller 20 through a LIN bus. During vehicle operation, the vehicle controller 10 needs to obtain various parameters of the thermal management system in the vehicle, including air-conditioning pressure, engine water temperature, intake air temperature, and motor water temperature, etc. Then, according to the air-conditioning pressure, engine water temperature, intake air temperature (and motor water temperature), the vehicle's target grille opening degree is determined, and the target grille opening degree is sent to the active grille controller 20; after obtaining the target grille opening degree, the active grille controller 20 controls the opening degree of the active intake grille to the target grille opening degree through a motor. In addition, the active grille controller 20 also feeds back the state of the active intake grille (including fault conditions) to the vehicle controller 10. Through the combination of the vehicle controller 10 and the active grille controller 20, the opening degree control of the active intake grille is realized, which is simple and convenient. The active grille controller 20 only needs to execute the target grille opening degree, without collecting operation data and making judgments, which can reduce the load of the active grille controller 20. In other embodiments, the active intake grille control device may further include other electronic control units on the vehicle, which will not be elaborated here.

[0039] In one embodiment, as Figure 4 shown, a method for controlling an active intake grille is provided. Taking the active intake grille control device in Figure 1 as an example, the method includes the following steps:

[0040] S10: Obtain the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle.

[0041] In this embodiment, the active intake grille control device includes a vehicle controller and an active grille controller.

[0042] During vehicle operation, the vehicle controller needs to obtain various parameters in the vehicle's thermal management system, including air-conditioning pressure, engine water temperature, intake air temperature (i.e., the intake air temperature of the active intake grille), motor water temperature, as well as data such as the current opening degree of the active intake grille and fan speed.

[0043] S20: Determine the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature, and intake air temperature.

[0044] As described above, the air-conditioning pressure, engine water temperature, and intake air temperature can all represent the thermal management requirements of the whole vehicle. After obtaining the air-conditioning pressure, engine water temperature, and intake air temperature, the vehicle controller also needs to determine the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature, and intake air temperature.

[0045] Among them, when the vehicle is a hybrid vehicle, the vehicle also includes a motor. To further ensure the accuracy of the target grille opening, it is also necessary to obtain the motor water temperature of the vehicle, and determine the target grille opening of the vehicle based on the air-conditioning pressure, engine water temperature, intake air temperature, and motor water temperature.

[0046] For example, real vehicle tests can be pre-conducted on the vehicle to calibrate the optimal grille opening under multi-dimensional data such as air-conditioning pressure, engine water temperature, intake air temperature (and motor water temperature) of the vehicle, so as to obtain the calibrated grille opening corresponding to different air-conditioning pressures, engine water temperatures, intake air temperatures (motor water temperatures) of the vehicle, that is, the calibrated grille opening under different working conditions, denoted as calibrated grille opening data; during the vehicle operation, after obtaining the air-conditioning pressure, engine water temperature, intake air temperature (motor water temperature), obtain the calibrated grille opening data stored in the vehicle, and query the calibrated grille opening jointly corresponding to the current air-conditioning pressure, engine water temperature, intake air temperature (motor water temperature) in the calibrated grille opening data as the target grille opening of the vehicle. Through the pre-calibrated calibrated grille opening data under different working conditions, the target grille opening can be determined accurately and quickly.

[0047] S30: Control the active intake grille of the vehicle according to the target grille opening.

[0048] After obtaining the target grille opening, the vehicle control unit sends the target grille opening to the controller of the active intake grille, that is, the active grille controller. The active grille controller controls the active intake grille through the motor so that the opening of the active intake grille is the target grille opening.

[0049] During the vehicle operation, by obtaining the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle, then determining the target grille opening of the vehicle according to the air-conditioning pressure, engine water temperature, and intake air temperature, and then controlling the active intake grille according to the target grille opening; in this embodiment, by determining the target grille opening according to the air-conditioning pressure, engine water temperature, and intake air temperature, and then controlling the opening of the active intake grille, the linkage relationship between environmental factors, air-conditioning state, engine state (and motor state) and the active intake grille is considered, the accuracy of the target grille opening is improved, so that the active intake grille control strategy can adapt to different working conditions, has a good energy-saving and emission-reduction effect, and also takes into account vehicle thermal management, giving full play to the potential of the active intake grille for energy-saving and emission-reduction optimization and thermal management optimization, thereby improving the thermal management efficiency.

[0050] In one embodiment, as Figure 5 shown, in step S20, that is, determining the target grille opening of the vehicle according to the air-conditioning pressure, engine water temperature, and intake air temperature, specifically includes the following steps:

[0051] S21: Based on the air-conditioning pressure, engine coolant temperature, and intake air temperature, determine multiple preset opening degrees of the preset grille, and determine the maximum opening degree among the multiple preset opening degrees.

[0052] After according to the air-conditioning pressure, engine coolant temperature, and intake air temperature, it is necessary to determine multiple preset opening degrees of the preset grille based on the air-conditioning pressure, engine coolant temperature, and intake air temperature, and determine the maximum opening degree among the multiple preset opening degrees. For example, determine the first preset opening degree corresponding to the air-conditioning pressure, and determine the second preset opening degree corresponding to the engine coolant temperature and the third preset opening degree corresponding to the intake air temperature, and then determine the maximum opening degree among the first preset opening degree, the second preset opening degree, and the third preset opening degree.

[0053] S22: Determine the target grille opening degree based on the maximum opening degree.

[0054] After determining the aforementioned maximum opening degree, determine the target grille opening degree based on this maximum opening degree. For example, it is possible to directly perform a limit judgment on the maximum opening degree among the first preset opening degree, the second preset opening degree, and the third preset opening degree, determine whether the maximum opening degree is greater than the first limit value, and determine whether the maximum opening degree is less than the second limit value. The first limit value is the minimum opening degree value allowed for the active intake grille. For example, the first limit value can be values such as 0%, 0.5%, 1%, etc. The second limit value is the maximum opening degree value allowed for the active intake grille. For example, the second limit value can be values such as 100%, 99%, 98%, etc.; if the maximum opening degree is greater than the first limit value and less than the second limit value, then the maximum opening degree can be directly used as the target grille opening degree, and control the opening degree of the active intake grille to be this target grille opening degree, which can determine that the opening degree of the active intake grille meets the thermal management requirements of different structures and avoid system overheating; if the maximum opening degree is less than or equal to the first limit value, then use the first limit value as the target grille opening degree; if the maximum opening degree is greater than or equal to the second limit value, use the second limit value as the target grille opening degree, limit the target grille opening degree within a reasonable opening range, ensure the accuracy of the active intake grille control, and ensure the thermal management efficiency.

[0055] In this embodiment, based on the air-conditioning pressure, engine coolant temperature, and intake air temperature, determine multiple preset opening degrees of the preset grille, determine the maximum opening degree among the multiple preset opening degrees, and then determine the target grille opening degree based on the maximum opening degree. On the one hand, it considers the linkage relationship between environmental factors, air-conditioning status, engine status, and the active intake grille, improves the accuracy of the target grille opening degree, enables the active intake grille control strategy to adapt to different working conditions, and has a good energy-saving and emission-reduction effect. On the other hand, it can reduce the calibration data volume, reduce the thermal management difficulty while ensuring the thermal management efficiency.

[0056] In one embodiment, in step S21, that is, for the air conditioner pressure, engine water temperature, and intake air temperature, multiple preset opening degrees of the preset grille are determined, and the maximum opening degree is determined among the multiple preset opening degrees. The specific steps are as follows:

[0057] S211: When there is no normally operating motor in the vehicle, determine the first preset opening degree, the second preset opening degree, and the third preset opening degree corresponding to the air conditioner pressure, engine water temperature, and intake air temperature respectively, and determine the maximum opening degree among the first preset opening degree, the second preset opening degree, and the third preset opening degree.

[0058] Since a fuel vehicle does not have a motor, or the motor of a hybrid vehicle fails and cannot operate normally, during the process of determining the target grille opening degree, it is necessary to determine whether there is a normally operating motor in the vehicle. Then, different target grille opening degree determination strategies are executed according to the determination result, so as to ensure the accuracy of the target grille opening degree.

[0059] When the vehicle is a fuel vehicle or the motor of a hybrid vehicle fails, that is, when there is no normally operating motor in the vehicle, it is necessary to determine the air conditioner pressure, engine water temperature, and intake air temperature, the corresponding first preset opening degree, the second preset opening degree, and the third preset opening degree respectively, and determine the maximum opening degree among the first preset opening degree, the second preset opening degree, and the third preset opening degree. Then, the target grille opening degree is determined based on the maximum opening degree. When there is no normally operating motor in the vehicle, there is no need to determine the motor water temperature and its corresponding preset opening degree, which reduces the data processing amount and the load on the premise of ensuring data accuracy.

[0060] S212: When there is a normally operating motor in the vehicle, obtain the motor temperature of the vehicle, determine the fourth preset opening degree corresponding to the motor temperature, and determine the maximum opening degree among the first preset opening degree, the second preset opening degree, the third preset opening degree, and the fourth preset opening degree.

[0061] When the vehicle is a hybrid vehicle and the motor of the hybrid vehicle is fault-free, that is, when there is a normally operating motor in the vehicle, obtain the motor temperature of the vehicle, determine the fourth preset opening degree corresponding to the motor temperature, and determine the maximum opening degree among the first preset opening degree, the second preset opening degree, the third preset opening degree, and the fourth preset opening degree. When there is a normally operating motor in the vehicle, the process of determining the motor water temperature and its corresponding preset opening degree is added, considering the influence of the motor water temperature on the active intake grille opening degree, so as to obtain a more accurate target grille opening degree.

[0062] Specifically, after obtaining the air conditioner pressure, engine coolant temperature, intake air temperature (and motor coolant temperature), it is necessary to obtain the pre-calibrated grille opening data, which is the optimal grille opening data obtained from the vehicle's actual vehicle tests under a single working condition and includes the first grille opening data, the second grille opening data, the third grille opening data, and the fourth grille opening data. Among them, the first grille opening data includes the calibrated grille opening at different air conditioner pressures; the second grille opening data includes the calibrated grille opening at different engine coolant temperatures; the third grille opening data includes the calibrated grille opening at different intake air temperatures; the third grille opening data includes the calibrated grille opening at different motor coolant temperatures. Then, when there is no normally operating motor in the vehicle, find the calibrated grille opening corresponding to the air conditioner pressure in the first grille opening data as the first preset opening corresponding to the air conditioner pressure; find the calibrated grille opening corresponding to the engine coolant temperature in the second grille opening data as the second preset opening corresponding to the engine coolant temperature; find the calibrated grille opening corresponding to the intake air temperature in the third grille opening data as the third preset opening corresponding to the intake air temperature, and determine the maximum opening among the first preset opening, the second preset opening, and the third preset opening, so as to determine the target grille opening based on the maximum opening. When there is a normally operating motor in the vehicle, it is also necessary to find the calibrated grille opening corresponding to the motor coolant temperature in the fourth grille opening data as the fourth preset opening corresponding to the motor coolant temperature, and determine the maximum opening among the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening, so as to determine the target grille opening based on the maximum opening. By pre-conducting actual vehicle tests on the vehicle under each single working condition, and then obtaining the grille opening data under different single working conditions, and further determining the preset opening under the corresponding working condition based on the grille opening data under each single working condition, the amount of data to be calibrated can be reduced, thereby reducing the difficulty of subsequent active intake grille opening control, further reducing the thermal management difficulty, and improving the thermal management efficiency.

[0063] In this embodiment, when there is no normally operating motor in the vehicle, determine the first preset opening, the second preset opening, and the third preset opening corresponding to the air conditioner pressure, the engine coolant temperature, and the intake air temperature respectively, and determine the maximum opening among the first preset opening, the second preset opening, and the third preset opening; when there is a normally operating motor in the vehicle, obtain the motor temperature of the vehicle, determine the fourth preset opening corresponding to the motor temperature, and determine the maximum opening among the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening, which clarifies the specific process of determining multiple preset openings of the preset grille opening based on the air conditioner pressure, the engine coolant temperature, and the intake air temperature, and determining the maximum opening among the multiple preset openings, and uses different maximum openings to determine the vehicle according to the system settings of different vehicles, ensuring the accuracy of the target grille opening.

[0064] In one embodiment, in step S22, that is, determining the target grille opening based on the maximum opening, specifically includes the following steps:

[0065] S221: Determine whether the maximum opening is greater than the first limit value and determine whether the maximum opening is less than the second limit value;

[0066] S222: If the maximum opening is greater than the first limit value and less than the second limit value, then determine the opening change value according to the corresponding changes in the air-conditioning pressure and the engine water temperature, and determine the target grille opening according to the opening change value and the current opening of the active intake grille.

[0067] S223: If the maximum opening is less than or equal to the first limit value, then use the first limit value as the target grille opening;

[0068] S224: If the maximum opening is greater than or equal to the second limit value, use the second limit value as the target grille opening.

[0069] In this embodiment, after determining the maximum opening among the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening, it is necessary to determine whether the maximum opening is greater than the first limit value and determine whether the maximum opening is less than the second limit value. If it is determined that the maximum opening is less than or equal to the first limit value, then use the first limit value as the target grille opening; if it is determined that the maximum opening is greater than or equal to the second limit value, use the second limit value as the target grille opening. When the maximum opening exceeds the limit, use the closest limit value as the target grille opening, which can limit the target grille opening within a reasonable opening range, ensure the accuracy of the active intake grille control, and guarantee the thermal management efficiency.

[0070] In addition, if it is determined that the maximum opening is greater than the first limit value and less than the second limit value, then determine the opening change value according to the corresponding changes in the air-conditioning pressure, the engine water temperature (and the motor water temperature), that is, determine the change situation of the air-conditioning pressure, the change situation of the engine water temperature (and the motor water temperature), determine the opening change value, and then determine the target grille opening according to the opening change value and the current opening of the active intake grille.

[0071] Among them, in different embodiments, the determination method of the preset opening value is different, that is, the opening change value has different determination methods. For example, when there is a normally operating motor in the vehicle, within a certain period of time, when the change value (including the increase value or the decrease value) of any one of the air-conditioning pressure, the engine water temperature, and the motor water temperature is greater than a preset threshold value, it is determined that the state of the air conditioner, the engine, or the motor has changed drastically in the short term. Based on the current opening of the active intake grille, at this time, it is necessary to increase or decrease the opening of the active intake grille, and a preset opening value (this preset opening value is a fixed positive value) needs to be obtained as the opening change value, and then based on the current opening of the active intake grille, add or subtract this opening change value to obtain the target grille opening. Among them, when the change value of any one of the air-conditioning pressure, the engine water temperature, and the motor water temperature is an increase value, that is, when any one of the air-conditioning pressure, the engine water temperature, and the motor water temperature increases, a fixed preset opening value (such as K1) is used as the opening change value, and the current opening of the active intake grille is added to the opening change value to obtain the target grille opening, so as to control the increase of the opening of the active intake grille for heat dissipation; when the change value of any one of the air-conditioning pressure, the engine water temperature, and the motor water temperature is a decrease value, that is, when any one of the air-conditioning pressure, the engine water temperature, and the motor water temperature decreases, a fixed preset opening value (such as K1) is used as the opening change value, and the current opening of the active intake grille is subtracted by the opening change value to obtain the target grille opening, so as to control the decrease of the opening of the active intake grille for warming up, thereby ensuring the thermal management efficiency of the vehicle. When there is no normally operating motor in the vehicle, the change situation corresponding to the motor water temperature is not considered, and the opening change value is determined only according to the change situations corresponding to the air-conditioning pressure and the engine water temperature, and then the target grille opening is determined according to the opening change value and the current opening of the active intake grille.

[0072] In addition, the opening change value can also be determined by other means. For example, when the vehicle has a normally operating motor, after a certain period of time, when any one of the air-conditioning pressure, engine water temperature, and motor water temperature changes (including increases or decreases), then based on the changed air-conditioning pressure, engine water temperature, and the current motor water temperature, the opening change value is determined, that is, the opening change value is determined according to the current air-conditioning pressure, current engine water temperature, and current motor water temperature. Specifically, the first opening change data, the second opening change data, and the third opening change data can be calibrated according to the actual vehicle test data. Among them, the first opening change data includes the change values of the active intake grille opening at different air-conditioning pressures; the second opening change data includes the change values of the active intake grille opening at different engine water temperatures; the third opening change data includes the change values of the active intake grille opening at different motor water temperatures. After a certain period of time, when any one of the air-conditioning pressure, engine water temperature, and motor water temperature changes (including increases or decreases), the change value corresponding to the current air-conditioning pressure is determined in the first opening change data to obtain the first change value, and the change value corresponding to the current engine water temperature is determined in the second opening change data to obtain the second change value. The change value corresponding to the current motor water temperature is determined in the second opening change data to obtain the third change value, and then the maximum value among the first change value, the second change value, and the third change value is selected as the opening change value. Furthermore, the current opening of the active intake grille is added to (or subtracted from) the opening change value to obtain the target grille opening, so as to control the active intake grille to open wider for heat dissipation (or temperature increase). When the vehicle does not have a normally operating motor, the change situation corresponding to the motor water temperature is not considered. Only the first change value corresponding to the current air-conditioning pressure and the second change value corresponding to the current engine water temperature are obtained, and the maximum value between the two is selected as the opening change value. Furthermore, the target grille opening is determined according to the opening change value and the current opening of the active intake grille.

[0073] In this embodiment, if it is determined that the maximum opening is greater than the first limit value and less than the second limit value, then according to the change situations corresponding to the air-conditioning pressure, engine water temperature, and motor water temperature, the opening change value is determined, and according to the opening change value and the current opening of the active intake grille, the target grille opening is determined. When the maximum opening is within the reasonable opening range, on the basis of ensuring the current heat management effect, the current opening of the active intake grille can be adaptively adjusted according to the change situations corresponding to the air-conditioning pressure, engine water temperature, and motor water temperature, further considering the influence of the state changes of the air conditioner, engine, and motor on the heat management effect, further improving the accuracy of the target grille opening, and further improving the heat management efficiency on the basis of reducing the management difficulty.

[0074] In one embodiment, in step S222, that is, according to the corresponding changes in the air conditioner pressure and the engine water temperature, the opening change value is determined, and based on the opening change value and the current opening of the active intake grille, the target grille opening is determined, which specifically includes the following steps:

[0075] SA201: Within a first preset time period, if the increase value of the air conditioner pressure is greater than a first threshold, or the increase value of the engine water temperature is greater than a second threshold, or the increase value of the motor water temperature is greater than a third threshold, then determine the opening change value as a first preset opening.

[0076] After determining that the maximum opening is greater than a first limit value and less than a second limit value, it is necessary to determine the changes in the air conditioner pressure, the engine water temperature, and the motor water temperature within a preset time period, so as to determine the opening change value according to the changes of the three.

[0077] Among them, within the first preset time period, it is necessary to determine whether the increase value of the air conditioner pressure is greater than the first threshold, whether the increase value of the engine water temperature is greater than the second threshold, and whether the increase value of the motor water temperature is greater than the third threshold; if it is determined that the increase value of the air conditioner pressure is greater than the first threshold, or the increase value of the engine water temperature is greater than the second threshold, or the increase value of the motor water temperature is greater than the third threshold, it means that the air conditioner pressure surges, the engine water temperature surges, or the motor water temperature surges, and the vehicle's heat dissipation requirement increases, then determine the opening change value as the first preset opening, where the first preset opening is a pre-calibrated positive value and can be calibrated based on the results of on-vehicle tests. The first preset time period can be values such as the first 60s, the first 2 minutes, the first 3 minutes, etc.

[0078] If within the first preset time period, the increase value of the air conditioner pressure is less than or equal to the first threshold, and the increase value of the engine water temperature is less than or equal to the second threshold, and the increase value of the motor water temperature is less than or equal to the third threshold, it means that there are no obvious changes in the air conditioner pressure, the engine water temperature, and the motor water temperature, and there is no need to optimize the control of the active intake grille, then use the current opening of the active intake grille as the target grille opening, that is, just maintain the current opening of the active intake grille.

[0079] SA202: Based on the first preset opening and the current opening of the active intake grille, determine the target grille opening.

[0080] After determining that the opening change value is the first preset opening, based on the first preset opening and the current opening of the active intake grille, determine the target grille opening. For example, the current opening of the active intake grille can be directly added to the first preset opening to obtain the target grille opening, so as to control the increase of the active intake grille opening for heat dissipation.

[0081] In this embodiment, within the first preset time period, if the increase value of the air conditioner pressure is greater than the first threshold value, or the increase value of the engine water temperature is greater than the second threshold value, or the increase value of the motor water temperature is greater than the third threshold value, then the opening change value is determined to be the first preset opening, and based on the first preset opening and the current opening of the active intake grille, the target grille opening is determined. The specific steps of determining the opening change value according to the changes of the air conditioner pressure, the engine water temperature, and the motor water temperature, and determining the target grille opening according to the opening change value and the current opening of the active intake grille are clarified. When it is determined that any one of the air conditioner pressure, the engine water temperature, and the motor water temperature rises rapidly, on the basis of the current opening of the active intake grille, a first preset opening is added to obtain the target grille opening, realizing the dynamic adjustment of the target grille opening, further improving the accuracy of the target grille opening, and thus enhancing the thermal management efficiency.

[0082] In one embodiment, in step SA202, that is, based on the first preset opening and the current opening of the active intake grille, determining the target grille opening specifically includes the following steps:

[0083] SA2021: Determine whether the sum of the current opening of the active intake grille and the first preset opening is greater than the third limit value.

[0084] After determining that the opening change value is the first preset opening, if the sum of the current opening of the active intake grille and the first preset opening is directly used as the target grille opening, the target grille opening may exceed the third limit value (such as exceeding the opening of 100%). At this time, to ensure the accuracy of the target grille opening, it is necessary to determine whether the sum of the current opening of the active intake grille and the first preset opening is greater than the second limit value, so as to execute different target grille opening determination strategies according to different judgment situations. Among them, the third limit value can be the same as the second limit value, both being the opening of 100%, and the second limit value can also be less than the second limit value. For example, the third limit value is the opening of 100%, and the second limit value is less than the opening of 100%.

[0085] SA2022: If it is less than the second limit value, then use the sum of the current opening of the active intake grille and the first preset opening as the target grille opening.

[0086] After determining whether the sum of the first preset opening and the current opening of the active intake grille is greater than the third limit value, if it is determined that the sum of the first preset opening and the current opening of the active intake grille is less than the third limit value, then the sum of the current opening of the active intake grille and the first preset opening can be directly used as the target grille opening to increase the opening of the active intake grille, increase the air intake volume, and dissipate the heat of the vehicle in time.

[0087] SA2023: If it is greater than or equal to the third limit value, then use the third limit value as the target grille opening.

[0088] After determining whether the sum of the first preset opening and the current opening of the active intake grille is greater than the third limit value, if it is determined that the sum of the first preset opening and the current opening of the active intake grille is greater than or equal to the third limit value, then the third limit value is used as the target grille opening to prevent the target grille opening from exceeding the grille opening limit and ensure the normal operation of the active intake grille.

[0089] In this embodiment, by determining whether the sum of the current opening of the active intake grille and the first preset opening is greater than the third limit value, if it is less than the third limit value, then the sum of the current opening of the active intake grille and the first preset opening is used as the target grille opening, and if it is greater than or equal to the third limit value, then the third limit value is used as the target grille opening, which clarifies the specific steps for determining the target grille opening based on the first preset opening and the current opening of the active intake grille. The target grille opening is dynamically adjusted based on the opening limit value. By restricting the target grille opening, on the basis of ensuring the vehicle management efficiency, it can also ensure that the target grille opening is within a reasonable opening range and ensure the normal operation of the active intake grille.

[0090] In one embodiment, in step S222, that is, according to the change conditions corresponding to the air-conditioning pressure and the engine water temperature, the opening change value is determined, and according to the opening change value and the current opening of the active intake grille, the target grille opening is determined, which specifically includes the following steps:

[0091] SC201: When there is a normally operating motor in the vehicle, within the second preset time period, if the decrease value of the air-conditioning pressure is greater than the fourth threshold, and the decrease value of the engine water temperature is greater than the fifth threshold, and the decrease value of the motor water temperature is greater than the sixth threshold, then the opening change value is determined to be the second preset opening.

[0092] After determining that the maximum opening is greater than the first limit value and less than the second limit value, or after determining whether the increase value of the air-conditioning pressure is greater than the first threshold, and determining whether the increase value of the engine water temperature is greater than the second threshold, and determining whether the increase value of the motor water temperature is greater than the third threshold, if there is a normally operating motor in the vehicle, it is necessary to determine the change conditions of the air-conditioning pressure, the engine water temperature, and the motor water temperature within the preset time period to determine the opening change value according to the change conditions of the three.

[0093] Among them, when there is a normally operating motor in the vehicle, within the second preset time period, if the decrease value of the air conditioner pressure is greater than the fourth threshold, and the decrease value of the engine water temperature is greater than the fifth threshold, and the decrease value of the motor water temperature is greater than the sixth threshold, it indicates that the air conditioner pressure, the engine water temperature, and the motor water temperature have all dropped suddenly. It is difficult to quickly increase the temperature only by the inherent structure of the vehicle. It is necessary to timely reduce the opening degree of the active intake grille and reduce the intake air volume, so as to achieve the purpose of rapid temperature increase. At this time, the opening degree change value is determined to be the second preset opening degree. When there is no normally operating motor in the vehicle, there is no need to consider the motor water temperature. Within the second preset time period, if the decrease value of the air conditioner pressure is greater than the fourth threshold, and the decrease value of the engine water temperature is greater than the fifth threshold, it indicates that the air conditioner pressure and the engine water temperature have both dropped suddenly. It is necessary to timely reduce the opening degree of the active intake grille and reduce the intake air volume, so as to achieve the purpose of rapid temperature increase. Then the opening degree change value is determined to be the second preset opening degree. Among them, the second preset opening degree is a pre-calibrated positive value, which can be calibrated based on the results of vehicle tests. The second preset opening degree can be different from the first preset opening degree.

[0094] If within the second preset time period, the decrease value of the air conditioner pressure is less than or equal to the fourth threshold, and / or the decrease value of the engine water temperature is less than or equal to the fifth threshold, and / or the decrease value of the motor water temperature is less than or equal to the sixth threshold, it indicates that there is no obvious change in the air conditioner pressure, the engine water temperature, and the motor water temperature. There is no need to optimize the control of the active intake grille. Then the current opening degree of the active intake grille is used as the target grille opening degree, that is, the current opening degree of the active intake grille is maintained.

[0095] In this embodiment, the second preset time period can be the same as the first preset time period, that is, within the same time period, the increase or decrease of the air conditioner pressure, the engine water temperature, and the motor water temperature are judged, which can make the data more accurate; in other embodiments, the second preset time period can also be different from the first preset time period. Similarly, the fourth threshold can be the same as the first threshold, the fifth threshold can be the same as the second threshold, and the sixth threshold can be the same as the third threshold. Using the same threshold to judge the same data is simple and convenient.

[0096] SC202: Determine the target grille opening degree based on the second preset opening degree and the current opening degree of the active intake grille.

[0097] After determining that the opening degree change value is the second preset opening degree, the target grille opening degree is determined based on the second preset opening degree and the current opening degree of the active intake grille. For example, the current opening degree of the active intake grille can be directly subtracted from the second preset opening degree and then added to obtain the target grille opening degree, so as to control the reduction of the opening degree of the active intake grille to increase the temperature of the vehicle and keep the vehicle running normally.

[0098] In this embodiment, within the second preset time period, if the decrease value of the air conditioner pressure is greater than the fourth threshold, the decrease value of the engine water temperature is greater than the fifth threshold, and the decrease value of the motor water temperature is greater than the sixth threshold, then the opening change value is determined to be the second preset opening, and then based on the second preset opening and the current opening of the active intake grille, the target grille opening is determined. Only when the air conditioner pressure, the engine water temperature, and the motor water temperature are all lower than the corresponding thresholds, the opening change value is determined to be the second preset opening, and then based on the second preset opening and the current opening of the active intake grille, the target grille opening is determined, realizing the dynamic adjustment of the target grille opening; compared with when the decrease value of any one of the air conditioner pressure, the engine water temperature, and the motor water temperature is less than the corresponding threshold, that is, reducing the grille opening to obtain the target grille opening, a more accurate target grille opening can be obtained, improving the thermal management efficiency.

[0099] In one embodiment, in step SC202, that is, based on the second preset opening and the current opening of the active intake grille, determining the target grille opening specifically includes the following steps:

[0100] SC2021: Determine whether the difference between the current opening of the active intake grille and the second preset opening is less than the fourth limit value.

[0101] After determining that the decrease value of the air conditioner pressure is greater than the fourth threshold, the decrease value of the engine water temperature is greater than the fifth threshold, and the decrease value of the motor water temperature is greater than the sixth threshold, and determining that the opening change value is the second preset opening, if the difference between the current opening of the active intake grille and the second preset opening is directly used as the target grille opening, the target grille opening may be lower than the fourth limit value (such as lower than the opening of 0%), and at this time, to ensure the accuracy of the target grille opening, it is necessary to determine whether the difference between the current opening of the active intake grille and the second preset opening is less than the fourth limit value, so as to execute different target grille opening determination strategies according to different judgment situations. Among them, the fourth limit value can be the same as the first limit value, both being the opening of 0%, and the fourth limit value can also be less than the first limit value. For example, the first limit value is the opening of 0%, and the fourth limit value is greater than the opening of 0%.

[0102] SC2022: If it is greater than the fourth limit value, then use the difference between the current opening of the active intake grille and the second preset opening as the target grille opening.

[0103] After determining whether the difference between the current opening of the active intake grille and the second preset opening is less than the fourth limit value, if the difference between the current opening of the active intake grille and the second preset opening is greater than the fourth limit value, then directly use the difference between the current opening of the active intake grille and the second preset opening as the target grille opening to reduce the opening of the active intake grille, reduce the intake air volume, and heat up the vehicle in a timely manner.

[0104] SC2023: If it is less than or equal to the fourth limit value, then use the fourth limit value as the target grille opening.

[0105] After determining whether the difference between the current opening degree of the active intake grille and the second preset opening degree is less than the fourth limit value, if the difference between the current opening degree of the active intake grille and the second preset opening degree is less than or equal to the fourth limit value, then use the fourth limit value as the target grille opening degree, so as to prevent the target grille opening degree from exceeding the grille opening limit and ensure the normal operation of the active intake grille.

[0106] In this embodiment, by determining whether the difference between the current opening degree of the active intake grille and the second preset opening degree is less than the fourth limit value; if it is greater than the fourth limit value, then use the difference between the current opening degree of the active intake grille and the second preset opening degree as the target grille opening degree; if it is less than or equal to the fourth limit value, then use the first limit value as the target grille opening degree, the specific steps for determining the target grille opening degree based on the second preset opening degree and the current opening degree of the active intake grille are clarified. Dynamically adjust the target grille opening degree based on the opening limit value. By restricting the target grille opening degree, on the basis of ensuring the vehicle management efficiency, it can also ensure that the target grille opening degree is within a reasonable opening range and ensure the normal operation of the active intake grille.

[0107] In one embodiment, after step S10, that is, after obtaining the air conditioning pressure, engine water temperature, and intake air temperature of the vehicle, the method further specifically includes the following steps:

[0108] S11: Determine the change situation of the engine water temperature;

[0109] S12: When the engine water temperature is greater than the specified temperature, control the active intake grille to be fully open.

[0110] To ensure the thermal management efficiency, after obtaining the air conditioning pressure, engine water temperature, and intake air temperature of the vehicle, it is also necessary to determine the change situation of the engine water temperature in real time, so as to dynamically adjust the opening degree of the active intake grille and the fan speed according to the determined change situation of the engine water temperature.

[0111] Specifically, after determining the change situation of the engine water temperature, when it is determined that the engine water temperature is greater than the specified temperature (such as 100 °C), control the active intake grille to be fully open, that is, control the opening degree of the active intake grille to be its maximum allowed opening degree, for example, 100%, so as to increase the intake air volume and dissipate the engine heat in time to ensure the normal operation of the vehicle.

[0112] In this embodiment, after obtaining the air conditioning pressure, engine water temperature, and intake air temperature of the vehicle, it is necessary to determine the change situation of the engine water temperature. Among them, when the engine water temperature is greater than the specified temperature, control the active intake grille to be fully open. By detecting the dynamic change of the water temperature and dynamically adjusting the opening degree of the intake grille, the vehicle thermal management efficiency is ensured and the normal operation of the vehicle is ensured.

[0113] In one embodiment, after step S11, that is, after determining the change in the engine water temperature, the method further specifically includes the following steps:

[0114] S14: In the third preset time period, if the decrease value of the engine water temperature is greater than the first preset value, determine the current state of the fan in the vehicle;

[0115] S15: If the current state of the fan is the off state, control the opening degree of the active air intake grille to decrease until the engine water temperature is within the preset temperature range.

[0116] After determining the change in the engine water temperature, it is not only necessary to compare the engine water temperature with the limit temperature, but also necessary to detect the change value of the engine water temperature within a certain time to determine whether the engine water temperature rises or drops abnormally. Among them, in the third preset time period, if the decrease value of the engine water temperature is greater than the first preset value, determine the current state of the fan in the vehicle. If the current state of the fan is the on state, turn off the fan to increase the temperature; if the current state of the fan is the off state, control the opening degree of the active air intake grille to decrease to promote the engine to warm up until the engine water temperature is within the preset temperature range.

[0117] In this embodiment, after determining the change in the engine water temperature, in the third preset time period, if the decrease value of the engine water temperature is greater than the first preset value, determine the current state of the fan. If the current state of the fan is the on state, turn off the fan. If the current state of the fan is the off state, control the opening degree of the active air intake grille to decrease until the engine water temperature is within the preset temperature range. By detecting the dynamic change of the water temperature, the opening degree of the air intake grille is dynamically adjusted.

[0118] In one embodiment, after step S11, that is, after determining the change in the engine water temperature, the method further specifically includes the following steps: In the third preset time period, if the increase value of the engine water temperature is greater than the second preset value, increase the speed of the fan and monitor the engine water temperature in real time. When the speed of the fan increases to the maximum speed, if it is determined that the engine water temperature is not within the preset temperature range, send an overheat fault prompt.

[0119] After determining the change of the engine water temperature, it is not only necessary to compare the engine water temperature with the limit temperature, but also to detect the change value of the engine water temperature within a certain period of time to determine whether the engine water temperature rises or drops abnormally. Among them, within the third preset time period, if the increase value of the engine water temperature is greater than the second preset value, it means that the engine water temperature rises rapidly and abnormally in a short period of time. Then, it is necessary to increase the speed of the fan to reduce the engine water temperature. At the same time, it is also necessary to monitor the engine water temperature in real time. When the speed of the fan increases to the maximum speed, if it is determined that the engine water temperature is not within the preset temperature range, that is, the engine water temperature still cannot reduce the temperature to the reasonable temperature range, a overheat fault prompt is sent to the vehicle, so that the vehicle limits the power of relevant components according to the overheat fault prompt, thereby avoiding vehicle overheating and ensuring the normal operation of the vehicle.

[0120] In this embodiment, after determining the change of the engine water temperature, within the third preset time period, if the increase value of the engine water temperature is greater than the second preset value, the speed of the fan is increased, and the engine water temperature is monitored in real time. When the speed of the fan increases to the maximum speed, if it is determined that the engine water temperature is not within the preset temperature range, a overheat fault prompt is sent, and the opening degree of the intake grille is dynamically adjusted by detecting the dynamic change of the water temperature.

[0121] In one embodiment, as Figure 6 shown, before step S10, that is, before obtaining the air conditioner pressure, engine water temperature and intake air temperature of the vehicle, the method further specifically includes the following steps:

[0122] S101: Judge the state of the active intake grille to determine the control mode of the active intake grille.

[0123] During the operation of the vehicle, before obtaining the air conditioner pressure, engine water temperature and intake air temperature of the vehicle, it is also necessary to judge the state of the active intake grille to determine the control mode of the active intake grille, and then execute different control strategies according to the control mode of the active intake grille. Among them, the control modes include waiting mode, normal mode, fault mode and sleep mode.

[0124] The specific judgment process of the control mode of the active intake grille is as Figure 7As shown in the figure. After the vehicle is powered on, the active intake grille enters the waiting mode 201. In the waiting mode 201, the active intake grille is initialized, and at the same time, fault detection of the active intake grille is performed, and the LIN communication status (i.e., the status of the LIN bus) is detected; when it is detected that the initialization is completed, if it is determined that the active intake grille has no faults and the LIN communication is normal, then it enters the normal mode 202; if it is determined that the active intake grille has faults or the LIN communication is lost, then it enters the fault mode 203; the faults here include motor stall faults, controller overvoltage faults, undervoltage faults, over-temperature faults, etc. In addition, in the waiting mode 201 and the normal mode 202, if the LIN communication is lost or the active intake grille has faults, it will enter the fault mode 203. In the fault mode 203, if the LIN communication is lost for more than a certain period of time, such as 4 s, then it enters the sleep mode 204; in the waiting mode 201 or the normal mode 202, if a sleep instruction for the active intake grille is received, it will also enter the sleep mode 203. When waking up through the LIN bus in the sleep mode 203, it enters the waiting mode 201. In the fault mode 204, if the LIN communication is restored or the fault is eliminated, if the initialization is not completed, then it enters the waiting mode 201, and if the initialization is completed, then it enters the normal mode 202.

[0125] S102: If the control mode is the normal mode, then obtain the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle to determine the target grille opening degree, and control the active intake grille according to the target grille opening degree.

[0126] S103: If the control mode is the waiting mode, then control the active intake grille to maintain the previous opening degree.

[0127] After determining the control mode of the active intake grille, if it is determined that the control mode of the active intake grille is the waiting mode, then control the active intake grille to maintain the previous opening degree to ensure its normal operation.

[0128] If it is determined that the control mode of the active intake grille is the normal mode, then steps S10 - S30 need to be executed, that is, obtain the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle to determine the target grille opening degree, and control the active intake grille according to the target grille opening degree to realize the dynamic adjustment of the active intake grille opening degree, thereby improving the thermal management efficiency.

[0129] S104: If the control mode is the fault mode or the sleep mode, then control the active intake grille to be fully open.

[0130] After determining the control mode of the active intake grille, if it is determined that the control mode of the active intake grille is the fault mode or the sleep mode, the active intake grille is controlled to be fully open. In the sleep mode, the active intake grille is fully open to prevent the water on the active intake grille from freezing during long-term storage in winter and freezing the active intake grille. In the fault mode, the active intake grille is also fully open to prevent the vehicle from not being able to dissipate heat normally due to the closure of the active intake grille.

[0131] In this embodiment, before obtaining the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle, it is necessary to first determine the state of the active intake grille to determine the control mode of the active intake grille. If the control mode is the normal mode, the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle are used to determine the target grille opening degree, and the active intake grille is controlled according to the target grille opening degree; if the control mode is the waiting mode, the active intake grille is controlled to maintain the previous opening degree; if the control mode is the fault mode or the sleep mode, the active intake grille is controlled to be fully open. By implementing different control strategies for the active intake grille according to different control modes of the active intake grille, it is possible to ensure the normal operation of the active intake grille and achieve dynamic adjustment of the opening degree of the active intake grille, ensuring thermal management efficiency.

[0132] Based on the above embodiments, the control strategy of the active intake grille in this active intake grille control method can significantly reduce the calibration workload, improve the working condition adaptability, reduce the development cost and cycle, and better achieve the effect of energy conservation and emission reduction. Taking the vehicle model equipped with this invention as an example, a real vehicle test of different aerodynamic accessory energy-saving technology installation schemes is carried out, and evaluations are made in terms of the vehicle's drag coefficient, energy-saving effect, vehicle mass, etc. The test results are as Figure 8 shown. By comparison, it can be seen that for the traditional fuel-saving scheme of adding a spoiler (Scheme 1), which combines an engine under spoiler, a front lower spoiler, and a rear lower spoiler to reduce wind resistance, save fuel, and reduce emissions, according to the test results and empirical values, the vehicle mass of Scheme 1 increases by 11.1 kg, the drag coefficient decreases by 0.022, and the energy-saving effect (fuel consumption) decreases by 0.13 L / 100 km. For the control strategy of the active intake grille provided in this embodiment (Scheme 2), the vehicle mass only increases by 2.7 kg, the drag coefficient decreases by 0.028, and the energy-saving effect (fuel consumption) decreases by 0.25 L / 100 km. Through experimental verification, compared with the traditional scheme of adding a spoiler to reduce drag, the control strategy of the active intake grille in this embodiment achieves a better drag reduction effect than the spoiler combination. The vehicle weight is 8.4 kg lower than that of Scheme 1, the drag coefficient is 0.006 lower than that of Scheme 1, and the fuel consumption (energy-saving effect) is 0.07 L / 100 km lower than that of Scheme 1.

[0133] In addition, different vehicle models were tested under the World Light Vehicle Test Cycle (WLTC), and the test results are as Figure 9 shown. Among them, for the vehicle model equipped with the present invention, the active intake grille control strategy provided in this embodiment is used, and its fuel consumption in the WLTC condition is only 4.76 L / 100 km (the target is not more than 5.0 L / 100 km). Compared with the announced fuel consumption of 6.8 L / 100 km for the vehicle model without the present invention (fuel version), 5.68 L / 100 km for the first hybrid vehicle of the same class, 5.27 L / 100 km for the second hybrid vehicle of the same class, 4.79 L / 100 km for the third hybrid vehicle of the same class, and 5.3 L / 100 km for the fourth hybrid vehicle of the same class, the fuel consumption of the vehicle model equipped with the present invention implementing the active intake grille control strategy is the lowest in the market of the same class, and the effect of energy conservation and emission reduction is the best.

[0134] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0135] In one embodiment, an active intake grille control device is provided, and the active intake grille control device corresponds one-to-one to the active intake grille control method in the above embodiment. As Figure 3 shown, the active intake grille control device includes a vehicle controller 10 and an active grille controller 20. The details of each controller are as follows:

[0136] The vehicle controller 10 is configured to obtain the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle; and determine the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature, and intake air temperature.

[0137] The active grille controller 20 is configured to control the active intake grille of the vehicle according to the target grille opening degree.

[0138] Optionally, the vehicle controller 10 is specifically configured to:

[0139] Determine a plurality of preset opening degrees of the preset grille opening degree based on the air-conditioning pressure, engine water temperature, and intake air temperature, and determine the maximum opening degree among the plurality of preset opening degrees;

[0140] Determine the target grille opening degree based on the maximum opening degree.

[0141] Optionally, the vehicle controller 10 is further specifically configured to:

[0142] When there is no normally operating motor in the vehicle, determine the first preset opening degree, the second preset opening degree, and the third preset opening degree corresponding to the air-conditioning pressure, the engine water temperature, and the intake air temperature respectively.

[0143] Determine the maximum opening among the first preset opening, the second preset opening, and the third preset opening.

[0144] Optionally, the vehicle controller 10 is further specifically configured to:

[0145] When there is a motor operating normally in the vehicle, obtain the motor temperature of the vehicle, and determine the fourth preset opening corresponding to the motor temperature;

[0146] Determine the maximum opening among the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening.

[0147] Optionally, the vehicle controller 10 is further specifically configured to:

[0148] Determine whether the maximum opening is greater than the first limit value, and determine whether the maximum opening is less than the second limit value;

[0149] If the maximum opening is greater than the first limit value and less than the second limit value, then determine the opening change value according to the change conditions of the air conditioner pressure and the engine water temperature, and determine the target grille opening according to the opening change value and the current opening of the active intake grille.

[0150] Optionally, after determining whether the maximum opening is greater than the first limit value and determining whether the maximum opening is less than the second limit value, the vehicle controller 10 is further specifically configured to:

[0151] If the maximum opening is less than or equal to the first limit value, then use the first limit value as the target grille opening;

[0152] If the maximum opening is greater than or equal to the second limit value, use the second limit value as the target grille opening.

[0153] Optionally, the vehicle controller 10 is further specifically configured to:

[0154] Within the first preset time period, if the increase value of the air conditioner pressure is greater than the first threshold value, or the increase value of the engine water temperature is greater than the second threshold value, or the increase value of the motor water temperature is greater than the third threshold value, then determine the opening change value as the first preset opening;

[0155] Based on the first preset opening and the current opening of the active intake grille, determine the target grille opening.

[0156] Optionally, the vehicle controller 10 is further specifically configured to:

[0157] Determine whether the sum of the current opening of the active intake grille and the first preset opening is greater than the third limit value;

[0158] If it is less than the third limit value, then use the sum of the current opening of the active intake grille and the first preset opening as the target grille opening;

[0159] If it is greater than or equal to the third limit value, then use the third limit value as the target grille opening degree.

[0160] Optionally, the vehicle controller 10 is further specifically configured to:

[0161] When there is a normally operating motor in the vehicle, within the second preset time period, if the decrease value of the air-conditioning pressure is greater than the fourth threshold, and the decrease value of the engine water temperature is greater than the fifth threshold, and the decrease value of the motor water temperature is greater than the sixth threshold, then determine the opening degree change value as the second preset opening degree;

[0162] Based on the second preset opening degree and the current opening degree of the active intake grille, determine the target grille opening degree.

[0163] Optionally, the vehicle controller 10 is further specifically configured to:

[0164] Determine whether the difference between the current opening degree of the active intake grille and the second preset opening degree is less than the fourth limit value;

[0165] If it is greater than the fourth limit value, then use the difference between the current opening degree of the active intake grille and the second preset opening degree as the target grille opening degree;

[0166] If it is less than or equal to the fourth limit value, then use the fourth limit value as the target grille opening degree.

[0167] Optionally, after obtaining the air-conditioning pressure, engine water temperature and intake air temperature of the vehicle, the vehicle controller 10 is further specifically configured to:

[0168] Determine the change situation of the engine water temperature;

[0169] If the engine water temperature is greater than the specified temperature, control the active intake grille to be fully open through the active grille controller 20.

[0170] Optionally, after determining the change situation of the engine water temperature, the vehicle controller 10 is further specifically configured to:

[0171] Within the third preset time period, if the decrease value of the engine water temperature is greater than the second preset value, then determine the current state of the fan in the vehicle;

[0172] If the current state of the fan is the off state, then control the opening degree of the active intake grille to decrease through the active grille controller 20 until the engine water temperature is within the preset temperature range.

[0173] Optionally, before obtaining the air-conditioning pressure, engine water temperature and intake air temperature of the vehicle, the vehicle controller 10 is further specifically configured to:

[0174] Perform a state judgment on the active intake grille to determine the control mode of the active intake grille;

[0175] If the control mode is the normal mode, obtain the air-conditioning pressure, engine water temperature, and intake air temperature of the vehicle to determine the target grille opening degree, and control the active intake grille through the active grille controller 20 according to the target grille opening degree;

[0176] If the control mode is the waiting mode, control the active intake grille to maintain the previous opening degree through the active grille controller 20;

[0177] If the control mode is the fault mode or the sleep mode, control the active intake grille to be fully open through the active grille controller 20.

[0178] For the specific limitations of the active intake grille control device, reference can be made to the limitations of the active intake grille control method in the above text, which will not be elaborated here. Each module in the above active intake grille control device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0179] In one embodiment, as Figure 10 shown, an active intake grille control device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the functions of the above active intake grille control method are realized.

[0180] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the functions of the above active intake grille control method are realized.

[0181] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to the memory, storage, database, or other media used in the various embodiments provided in the present application can include non-volatile and / or volatile memories.

[0182] It can be clearly understood that for the convenience and simplicity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0183] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An active intake grille control method, characterized in that, comprising: obtaining the air-conditioning pressure, engine water temperature and intake air temperature of the vehicle; determining the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature and intake air temperature; controlling the active intake grille of the vehicle according to the target grille opening degree.

2. The active intake grille control method according to claim 1, characterized in that, the determining the target grille opening degree of the vehicle according to the air-conditioning pressure, engine water temperature and intake air temperature comprises: determining a plurality of preset opening degrees of the preset grille opening degree based on the air-conditioning pressure, engine water temperature and intake air temperature, and determining the maximum opening degree among the plurality of preset opening degrees; determining the target grille opening degree based on the maximum opening degree.

3. The active intake grille control method according to claim 2, characterized in that, the determining a plurality of preset opening degrees of the preset grille opening degree based on the air-conditioning pressure, engine water temperature and intake air temperature, and determining the maximum opening degree among the plurality of preset opening degrees comprises: when there is no normally operating motor in the vehicle, determining a first preset opening degree, a second preset opening degree and a third preset opening degree corresponding to the air-conditioning pressure, engine water temperature and intake air temperature respectively; determining the maximum opening degree among the first preset opening degree, the second preset opening degree and the third preset opening degree.

4. The active intake grille control method according to claim 2, characterized in that, the determining a plurality of preset opening degrees of the preset grille opening degree based on the air-conditioning pressure, engine water temperature and intake air temperature, and determining the maximum opening degree among the plurality of preset opening degrees comprises: when there is a normally operating motor in the vehicle, obtaining the motor temperature of the vehicle, and determining a fourth preset opening degree corresponding to the motor temperature; determining the maximum opening degree among the first preset opening degree, the second preset opening degree, the third preset opening degree and the fourth preset opening degree.

5. The active intake grille control method according to claim 2, characterized in that, the determining the target grille opening degree based on the maximum opening degree comprises: determining whether the maximum opening degree is greater than a first limit value and determining whether the maximum opening degree is less than a second limit value; if the maximum opening degree is greater than the first limit value and less than the second limit value, determining an opening degree change value according to the change conditions corresponding to the air-conditioning pressure and the engine water temperature, and determining the target grille opening degree according to the opening degree change value and the current opening degree of the active intake grille.

6. The active intake grille control method according to claim 5, characterized in that, after the determining whether the maximum opening degree is greater than a first limit value and determining whether the maximum opening degree is less than a second limit value, the method further comprises: if the maximum opening degree is less than or equal to the first limit value, taking the first limit value as the target grille opening degree; if the maximum opening degree is greater than or equal to the second limit value, taking the second limit value as the target grille opening degree.

7. The active intake grille control method according to claim 5, characterized in that, Determining an opening change value according to the corresponding changes of the air conditioner pressure and the engine water temperature, and determining the target grille opening according to the opening change value and the current opening of the active intake grille, includes: Within a first preset time period, if the increase value of the air conditioner pressure is greater than a first threshold value, or the increase value of the engine water temperature is greater than a second threshold value, or the increase value of the motor water temperature is greater than a third threshold value, then determine the opening change value as a first preset opening; Based on the first preset opening and the current opening of the active intake grille, determine the target grille opening.

8. The active intake grille control method according to claim 7, wherein, The determining the target grille opening based on the first preset opening and the current opening of the active intake grille includes: Determine whether the sum of the current opening of the active intake grille and the first preset opening is greater than a third limit value; If it is less than the third limit value, then use the sum of the current opening of the active intake grille and the first preset opening as the target grille opening; If it is greater than or equal to the third limit value, then use the third limit value as the target grille opening.

9. The active intake grille control method according to claim 5, wherein, Determining an opening change value according to the corresponding changes of the air conditioner pressure and the engine water temperature, and determining the target grille opening according to the opening change value and the current opening of the active intake grille, includes: When there is a normally operating motor in the vehicle, within a second preset time period, if the decrease value of the air conditioner pressure is greater than a fourth threshold value, and the decrease value of the engine water temperature is greater than a fifth threshold value, and the decrease value of the motor water temperature is greater than a sixth threshold value, then determine the opening change value as a second preset opening; Based on the second preset opening and the current opening of the active intake grille, determine the target grille opening.

10. The active intake grille control method according to claim 9, wherein, The determining the target grille opening based on the second preset opening and the current opening of the active intake grille includes: Determine whether the difference between the current opening of the active intake grille and the second preset opening is less than a fourth limit value; If it is greater than the fourth limit value, then use the difference between the current opening of the active intake grille and the second preset opening as the target grille opening; If it is less than or equal to the fourth limit value, then use the fourth limit value as the target grille opening.

11. The active intake grille control method according to any one of claims 1-10, wherein, After obtaining the air conditioner pressure, the engine water temperature and the intake air temperature of the vehicle, the method further includes: Determine the change situation of the engine water temperature; If the engine water temperature is greater than the specified temperature, control the active intake grille to be fully open.

12. The active intake grille control method according to claim 11, wherein, After determining the change situation of the engine water temperature, the method further includes: During a third preset time period, if the decrease value of the engine water temperature is greater than a first preset value, determine the current state of the fan in the vehicle; If the current state of the fan is the off state, control the opening degree of the active intake grille to decrease until the engine water temperature is within a preset temperature range.

13. The active intake grille control method according to any one of claims 1-10, characterized in that, before obtaining the air conditioning pressure, engine water temperature and intake air temperature of the vehicle, the method further includes: judging the state of the active intake grille to determine the control mode of the active intake grille; if the control mode is the normal mode, obtain the air conditioning pressure, engine water temperature and intake air temperature of the vehicle to determine the target grille opening degree, and control the active intake grille according to the target grille opening degree; if the control mode is the waiting mode, control the active intake grille to maintain the previous opening degree.

14. The active intake grille control method according to claim 13, characterized in that, after judging the state of the active intake grille to determine the control mode of the active intake grille, the method further includes: if the control mode is the fault mode or the sleep mode, control the active intake grille to be fully open.

15. An active intake grille control device, characterized in that, comprises a vehicle controller and an active grille controller; wherein, the vehicle controller is used for: obtain the air conditioning pressure, engine water temperature and intake air temperature of the vehicle; determine the target grille opening degree of the vehicle according to the air conditioning pressure, engine water temperature and intake air temperature; the active grille controller is used to control the active intake grille of the vehicle according to the target grille opening degree.

16. A readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the steps of the active intake grille control method according to any one of claims 1 to 14 are implemented.

17. A vehicle, characterized in that, the vehicle includes an active intake grille and an active intake grille control device, and the active intake grille control device is used to execute the steps of the active intake grille control method according to any one of claims 1 to 14.

Images