Active air inlet grille and front end cooling fan control method and system

Abstract

The invention belongs to the technical field of electric vehicles, and particularly relates to an active air inlet grille and front end cooling fan control method and system. The actual environment temperature and the actual vehicle speed of a new energy vehicle, the actual pressure of an air conditioner pipeline and the actual rotating speed of an air conditioner compressor are collected; and according to the actual vehicle speed, the actual pressure of the air conditioner pipeline, the pressure values of the air conditioner system under different working conditions and the actual rotating speed and the actual temperature of an air conditioner compressor, the optimal target opening degree of the air inlet grille is matched, the air inlet grille is controlled to execute the air inlet action at the target opening and closing angle, and a fan is controlled to execute the air inlet action at the duty ratio. The problems that in the prior art, an air inlet grille and a fan are passively controlled according to requests of an air conditioning system and a cooling system, the air inlet amount is unreasonable, the influence on energy consumption of a whole vehicle is large, and the endurance economy of the vehicle is poor are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to a control method and system for an active air intake grille and a front-end cooling fan. Background Art

[0002] In order to increase the driving range, electric vehicles are currently usually equipped with active air intake grilles. By controlling the opening and closing angles of the active air intake grille blades and adjusting the front-end air intake volume, it is hoped that energy consumption can be reduced.

[0003] The front air intake volume needs to be achieved by controlling the opening and closing angle of the active air intake grille blades and the duty cycle of the front cooling fan. The air intake grille and the front cooling fan in the related technology can only be passively controlled according to the request of the air conditioning system and the cooling system. The energy consumption benefit of the active air intake grille is not comprehensively optimized with the energy consumption of the fan and the air conditioning compressor to accurately control the opening and closing angle of the air intake grille and the duty cycle of the front cooling fan. The energy consumption benefit is not large, which reduces the endurance economy of the vehicle and needs to be solved urgently. Summary of the invention

[0004] The present invention provides an active air intake grille and front-end cooling fan control method and system to solve the technical problems in the prior art that the air intake grille and the fan are passively controlled according to the requests of the air conditioning system and the cooling system, the air intake volume is unreasonable, the energy consumption of the whole vehicle is greatly affected, and the vehicle's endurance economy is poor.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: An active air intake grille and front-end cooling fan control method includes the following methods: Under different ambient temperatures and vehicle speeds of the vehicle, the vehicle drag coefficient values, the airflow pressure difference values ​​before and after the fan, and the air volume values ​​of the radiator passing through the front end of the fan are collected under different combinations of grille openings and fan duty cycles. The synthetic relationship table 1 of ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient values, airflow pressure difference values ​​before and after the fan, and air volume values ​​of the radiator passing through the front end of the fan is shown; According to the airflow pressure difference before and after the fan corresponding to different ambient temperatures and different fan duty cycles in relation table 1, the corresponding fan energy consumption value is calculated, and the ambient temperature, fan duty cycle, airflow pressure difference before and after the fan and fan energy consumption value are synthesized in relation table 2; According to the relationship table 1, the compressor energy consumption value of the air conditioning system under different ambient temperatures, different air conditioning system pressure values, and different compressor speeds is calculated by the radiator air volume value at the front end of the fan, and the ambient temperature, radiator air volume, air conditioning system pressure value, compressor speed, and compressor energy consumption value are synthesized in the relationship table 3; Different vehicle speeds, ambient temperatures, air-conditioning system pressure values ​​and compressor speeds are matched with the optimal grille opening and fan duty cycle control combination according to the principle of optimal vehicle energy consumption through relationship tables 1, 2 and 3. Vehicle speed, ambient temperature, air-conditioning system pressure value and compressor speed as well as optimal grille opening and fan duty cycle are synthesized into relationship table 4. According to the vehicle drag coefficient value in relationship table 1, the fan energy consumption value in relationship table 2, the compressor energy consumption value in relationship table 3 and the one-dimensional simulation model of the vehicle system energy consumption, the optimal grille opening and fan duty cycle control combination is obtained according to the optimal vehicle energy consumption.

[0006] According to relationship table 1, relationship table 2 and relationship table 3, the fan energy consumption values ​​and compressor energy consumption values ​​under different ambient temperatures, different vehicle speeds, different air-conditioning system pressure values ​​and different compressor speeds are queried respectively. By collecting the real-time data of the vehicle such as the real-time ambient temperature, real-time vehicle speed, real-time air-conditioning system pressure value, real-time compressor speed, and the principle of optimal energy consumption, relationship table 4 is queried to retrieve the optimal grille opening and the optimal fan duty cycle.

[0007] The corresponding relationship among the ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, air flow pressure difference value before and after the fan, and radiator air volume value through the front end of the fan in relationship table 1 is obtained through three-dimensional vehicle dynamics simulation.

[0008] The corresponding relationship among the ambient temperature, fan duty cycle, the airflow pressure difference before and after the fan, and the fan energy consumption value in relationship table 2 is obtained through a fan bench test, and the relationship among the ambient temperature, fan duty cycle, the airflow pressure difference before and after the fan, and the fan energy consumption value is further calculated based on the experimental data.

[0009] The data relationship between the ambient temperature, radiator air volume, air conditioning system pressure value, compressor speed and compressor energy consumption in relational table 3 is obtained through one-dimensional simulation of the thermal management system or a system bench, and the data is further calculated to obtain the corresponding compressor energy consumption value.

[0010] The air conditioning system pressure values ​​in the relational table 3 are divided into the low pressure value of the air conditioning system and the high pressure value of the air conditioning system. When the air conditioning is in the refrigeration working condition, the low pressure value of the air conditioning system is queried; when the air conditioning is in the heat pump working condition, the high pressure value of the air conditioning system is queried. When the air conditioning is in the refrigeration working condition, the corresponding compressor energy consumption value is queried according to the low pressure value of the air conditioning system; when the air conditioning is in the heat pump working condition, the compressor energy consumption value at this time is queried according to the high pressure value of the air conditioning system.

[0011] The grille opening includes fully closed, low, high and fully open. The fully closed is 0%, the low is 30%, the high is 60% and the fully open is 90%. Different grille openings correspond to different fan duty cycles.

[0012] The fan duty cycle includes 0%, low duty cycle 20%, medium duty cycle 40%, medium-high duty cycle 70%, and high duty cycle 95%; when the grille opening is fully open, the fan can control the duty cycle to 0%, 20%, 40%, 70%, and 95%; when the grille opening is at other openings, the fan duty cycle is controlled to 0%.

[0013] An active air intake grille and front cooling fan control system, It includes data acquisition module, data processing module and optimization module; The data acquisition module is used to collect the vehicle drag coefficient value, the airflow pressure difference value before and after the fan, and the air volume value of the radiator passing through the front end of the fan under different ambient temperatures and different vehicle speeds of the vehicle. The ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, airflow pressure difference value before and after the fan, and radiator air volume value passing through the front end of the fan are synthesized in Table 1; The data processing module is used to calculate the corresponding fan energy consumption value according to the airflow pressure difference value before and after the fan corresponding to different fan duty cycles and the vehicle drag coefficient in the relationship table 1, and the ambient temperature, fan duty cycle, the airflow pressure difference value before and after the fan, and the fan energy consumption value are synthesized in the relationship table 2; according to the relationship table 1, the compressor energy consumption value of the air conditioning system under different ambient temperatures, different air conditioning system pressure values, and different compressor speeds is calculated by the radiator air volume value at the front end of the fan, and the ambient temperature, radiator air volume value, air conditioning system pressure value, compressor speed, and compressor energy consumption value are synthesized in the relationship table 3; The optimization module is used to collect the real-time data of the vehicle such as the real-time ambient temperature, real-time vehicle speed, real-time air-conditioning system pressure value, real-time compressor speed, and the energy consumption optimization principle, and query the relationship table 4 to retrieve the optimal grille opening and the optimal fan duty cycle.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses an active air intake grille and front-end cooling fan control method and system, which comprehensively considers the vehicle drag coefficient, fan energy consumption and compressor energy consumption, and accurately matches the optimal air intake grille opening and fan duty cycle under different working conditions. When the air conditioner is turned on, the best combination can be obtained from relationship table 4 based on the real-time collected ambient temperature, vehicle speed, air conditioning system pressure value, compressor speed and other data, avoiding unnecessary air intake and heat dissipation, reducing the energy waste of fans and compressors, and thus improving the vehicle's cruising range. Compared with the traditional passive control method, it is no longer controlled based on simple requests from the air conditioning system and the cooling system, but starts from the perspective of optimal energy consumption, achieving more refined energy management and reducing the energy consumption level of the entire vehicle.

[0015] Furthermore, in an active air intake grille and front-end cooling fan control system, the self-test module performs comprehensive tests on key components and sensors in the system, and can promptly detect potential faults and output test data. When an abnormality occurs in the electric drive water temperature sensor, compressor speed signal, or air conditioning sensor, corresponding measures can be taken quickly to control the maximum opening of the active air intake grille to avoid more serious problems caused by continued operation of the faulty component, thereby improving the reliability and stability of the system.

[0016] Furthermore, the control module and drive module in the active air intake grille and front-end cooling fan control system are integrated. The control module further analyzes and processes the output of corresponding control signals based on the precise real-time data of the vehicle. The drive module can accurately execute the control signals. The control module and the drive module jointly ensure the stable operation of the entire control system and reduce the risk of system failure caused by improper control.

[0017] Furthermore, by constructing relation tables 1-4, the parameter relationships under various working conditions in the automobile air conditioning system are covered, so that the system can adapt to changes in different ambient temperatures, vehicle speeds, and different working conditions of the air conditioning. Whether in high or low temperature environments, or at different driving speeds, the appropriate control strategy can be quickly found according to the preset relation table, which has strong flexibility and adaptability and can meet the complex and changing operating requirements of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Air conditioning active air intake grille and fan duty cycle control display; Figure 2 : Display of active air intake grille and fan duty cycle control under air conditioning cooling conditions; Figure 3 : Schematic representation of active air intake grille and fan duty cycle control under air conditioning heat pump working conditions; Figure 4 : Schematic diagram of the air conditioning active air intake grille and front cooling fan control system; Figure 5 : Air conditioning active air intake grille and front cooling fan control flow chart. DETAILED DESCRIPTION

[0019] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0020] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] like Figure 1As shown, it is a tabular schematic diagram of the control method of the active air intake grille and the front-end cooling fan of the air conditioner of the present invention. Under different ambient temperatures and different vehicle speeds of the vehicle, the vehicle drag coefficient value, the air flow pressure difference value before and after the fan, the air conditioning system pressure value and the air volume value of the radiator through the front end of the fan are collected under different grille openings and fan duty cycle control combinations of the vehicle. The ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, air flow pressure difference value before and after the fan and the air volume value of the radiator through the front end of the fan are synthesized in Table 1; according to the air flow pressure difference value before and after the fan corresponding to different ambient temperatures and different fan duty cycles in Table 1, the corresponding fan energy consumption value is calculated; the ambient temperature, fan duty cycle, air flow pressure difference value before and after the fan and the fan energy consumption value are synthesized in Table 2; according to the air flow pressure difference value before and after the fan corresponding to different ambient temperatures and different fan duty cycles in Table 1, the corresponding fan energy consumption value is calculated; The radiator air volume value at the front end of the fan is calculated to obtain the compressor energy consumption value of the air-conditioning system under different ambient temperatures, different air-conditioning system pressure values, and different compressor speeds. The ambient temperature, radiator air volume, air-conditioning system pressure value, compressor speed, and compressor energy consumption value are synthesized in Table 3; different vehicle speeds, ambient temperatures, air-conditioning system pressure values, and compressor speeds are matched with the optimal grille opening and fan duty cycle control combination according to the optimal vehicle energy consumption principle through Table 1, Table 2, and Table 3. The vehicle speed, ambient temperature, air-conditioning system pressure value, compressor speed, and optimal grille opening and fan duty cycle are synthesized in Table 4. According to the vehicle drag coefficient value in Table 1, the fan energy consumption value in Table 2, the compressor energy consumption value in Table 3, and the one-dimensional simulation model of the vehicle system energy consumption, the optimal grille opening and fan duty cycle control combination is obtained based on the optimal vehicle energy consumption.

[0022] According to relationship table 1, relationship table 2 and relationship table 3, the fan energy consumption values ​​and compressor energy consumption values ​​under different ambient temperatures, different vehicle speeds, different air-conditioning system pressure values ​​and different compressor speeds are queried respectively. By collecting the real-time data of the vehicle such as the real-time ambient temperature, real-time vehicle speed, real-time air-conditioning system pressure value, real-time compressor speed, and the principle of optimal energy consumption, relationship table 4 is queried to retrieve the optimal grille opening and the optimal fan duty cycle.

[0023] This embodiment provides an active air intake grille and front-end cooling fan control method, and the specific implementation steps are as follows: like Figure 2As shown in , at different ambient temperatures and different vehicle speeds, the actual situation of the vehicle is simulated in a virtual wind tunnel in three dimensions, and the vehicle drag coefficient value, the airflow pressure difference value before and after the fan, and the air volume value of the radiator passing through the front end of the fan are collected under different combinations of the grille opening and the fan duty cycle control. The relationship between ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, airflow pressure difference value before and after the fan, and radiator air volume value passing through the front end of the fan is shown in Table 5; the grille opening includes the fully closed gear , low gear, high gear and full open gear, the full closed gear is 0%, the low gear is 30%, the high gear is 60%, and the full open gear is 90%; the fan duty cycle includes a duty cycle of 0%, a low duty cycle of 20%, a medium duty cycle of 40%, a medium-high duty cycle of 70%, and a high duty cycle of 95%; different grille openings correspond to different fan duty cycles, and when the grille opening is fully open, the fan can control the duty cycle of 0%, 20%, 40%, 70%, and 95%; when the grille opening is other openings, the fan duty cycle is controlled to be 0%. According to the airflow pressure difference before and after the fan corresponding to different ambient temperatures and different fan duty cycles in relational table 5, and the fan in the automobile air conditioning system is tested individually, the corresponding fan energy consumption value is calculated, and the ambient temperature, fan duty cycle, airflow pressure difference before and after the fan and fan energy consumption value are synthesized in relational table 6; by performing a one-dimensional simulation of the air conditioning thermal management system, the data such as the automobile ambient temperature, radiator air volume, compressor speed, and compressor energy consumption value under different air conditioning system pressure values ​​of the air conditioning are obtained. When the air-conditioning system is in cooling condition, the pressure value of the air-conditioning system is the low pressure value of the air-conditioning system. According to relationship table 5, the energy consumption value of the compressor under different ambient temperatures, different compressor speeds and low pressure values ​​of the air-conditioning system is calculated through the radiator air volume value at the front end of the fan. The ambient temperature, radiator air volume, compressor speed, low pressure value of the air-conditioning system and compressor energy consumption value are synthesized in relationship table 7; according to relationship table 5, relationship table 6 and relationship table 7, the pressure value of the air-conditioning system is the high pressure value of the air-conditioning system when the air-conditioning system is in cooling condition, the optimal grille opening and the optimal fan duty cycle under different ambient temperatures, different vehicle speeds, different low pressure values ​​of the air-conditioning system and different compressor speeds are respectively queried. The optimal grille opening and the optimal fan duty cycle under different ambient temperatures, different vehicle speeds, different compressor speeds, low pressure values ​​of the air-conditioning system, the optimal grille opening and the optimal fan duty cycle are synthesized in relationship table 8. Figure 3 As shown in, when the air-conditioning system is in heat pump working condition, the air-conditioning system pressure value is the air-conditioning system high pressure value, and the ambient temperature, radiator air volume, air-conditioning system high pressure value, compressor speed and compressor energy consumption value are synthesized in relationship table 9; according to relationship table 5, relationship table 6 and relationship table 9, when the air-conditioning system is in heat pump working condition, the optimal grille opening and the optimal fan duty cycle under different ambient temperatures, different vehicle speeds, different air-conditioning system high pressure values ​​and different compressor speeds are queried respectively, and the synthetic relationship table 10 of different ambient temperatures, different vehicle speeds, different compressor speeds, air-conditioning system high pressure values, the optimal grille opening and the optimal fan duty cycle are queried.

[0024] like Figure 5 As shown, the control flow chart of the present invention: Step S1, actively power on the air intake grille and the front fan. ; Step S2, system self-check, execute steps S3, S4, S5, and S6; Step S3, if the active air intake grille is detected to be normal, execute step S7; Step S4, if the front-end fan is detected to be normal, execute step S7; Step S5, if the electric drive water temperature sensor is detected to be normal, execute step S7; Step S6, if the vehicle speed is detected to be greater than 40 km / h, execute step S7; Step S7, determine whether all of steps S3 to S6 are true, if all are true, execute step 8, otherwise, execute step S18; Step S8, determining whether the electric drive water temperature is not over-temperature, if over-temperature, executing step 9, otherwise, executing step S18; Step S9, system self-check, execute step S10, step S11, step S12; Step S10, if the ambient temperature sensor is detected to be normal, execute step S13; Step S11, if the compressor speed signal is detected to be normal, execute step S13; Step S12, if the air conditioner high pressure and low pressure sensors are detected to be normal, execute step S13; Step S13, determine whether all of steps S10 to S12 are true, if true, execute step 14, otherwise, execute step S15; Step S14, determining whether the air conditioner is turned on, if the air conditioner is turned on, executing steps 16 and 17, otherwise, executing step S15; Step S15, close the active air intake grille and the front fan, and execute step S8; Step S16, if the air conditioner operating condition is a cooling condition, query relation table 4 to obtain the optimal grille opening and fan duty cycle control combination; Step S17, if the air conditioner operating condition is a heat pump condition, query relation table 6 to obtain the optimal grille opening and fan duty cycle control combination; Step S18, controlling the active air intake grille opening and the front end fan duty cycle according to the optimal grille opening and fan duty cycle control combination value.

[0025] Based on Figure 5 The control flow in Figure 4The control system in the system, through the following series of detection and judgment processes, searches for the optimal control combination according to the relationship table under different working conditions, and realizes the precise control of the opening of the air intake grille and the fan duty cycle of the automobile air conditioner to optimize energy consumption and vehicle performance. The control process includes the following steps: First, the power supply module powers on the active air intake grille and front fan of the automobile air-conditioning system, provides initial power to the control systems of the active air intake grille and front fan, and completes the initialization of the air-conditioning system.

[0026] The air-conditioning system is self-checked through the self-check module to confirm that the active air intake grille, front-end fan and electric drive water temperature sensor in the air-conditioning system are normal and monitor the vehicle speed to be greater than 40Km / h. If the self-check module determines that one of the active air intake grille, front-end fan and electric drive water temperature sensor in the air-conditioning system is in an abnormal state or the vehicle speed is lower than 40Km / h, the self-check module generates the detection result as abnormal detection data information and outputs it to the control module. After receiving the data, the control module analyzes and processes the data and outputs a control signal to the drive module. The drive module controls the opening of the active air intake grille in the air-conditioning system to the maximum opening according to the control signal. If the self-check module determines that the active air intake grille, front-end fan and electric drive water temperature sensor in the air-conditioning system are all in normal working state and the vehicle speed is greater than 40Km / h, the self-check module further determines whether the electric drive water temperature is over-temperature. If the electric drive water temperature is If the temperature is over, the self-test module generates electric drive water temperature detection data and sends the data to the control module. After receiving the data, the control module analyzes and processes the data and outputs a control signal to the drive module. The drive module controls the opening of the active air intake grille in the air-conditioning system to be adjusted to the maximum opening according to the control signal; if the self-test module detects that the electric drive water temperature is not overtemperature, the self-test module further determines whether the ambient temperature sensor, compressor speed signal, and air conditioning high-pressure and low-pressure sensors in the air-conditioning system are normal. If one or more of the ambient temperature sensor, compressor speed signal, and air conditioning high-pressure and low-pressure sensors monitored by the self-test module are abnormal, the control module generates an active control signal according to the detection result output by the self-test module, and the drive module receives the control signal and controls the active air intake grille and the front end fan to be closed according to the control signal, that is, the opening of the active grille is adjusted to the fully closed position of 0%, and the fan duty cycle is 0%. If the self-test module monitors that the ambient temperature sensor, the compressor speed signal, and the air conditioner high-pressure and low-pressure sensors are all normal, the self-test module further detects whether the air conditioner is turned on. If the air conditioner is in the off state, the control module generates an active control signal according to the detection result output by the self-test module, and the drive module receives the control signal and controls the active air intake grille and the front fan to be turned off according to the control signal. If the self-test module detects that the air conditioner is in the on state, the self-test module detects whether the operating condition of the air conditioner is the cooling condition or the heat pump condition. If the air conditioner is in the cooling condition, the self-test module outputs the cooling detection data to the control module. The control module receives the real-time monitoring data of the vehicle speed, ambient temperature, and compressor speed output by the data monitoring module. The control module queries the relation table 8 according to the real-time monitoring data and the cooling detection data output by the self-test module, and obtains the optimal grille opening and fan duty cycle corresponding to the current vehicle speed, current ambient temperature, current low pressure value of the air conditioning system, and current compressor speed of the vehicle in the cooling state of the air conditioner, and outputs the optimal control signal to the drive module after analyzing and processing the query result. The drive module adjusts the active grille opening and fan duty cycle of the vehicle according to the optimal control signal.If the air conditioner is in heat pump working condition, the self-test module outputs heat pump detection data to the control module, and the control module receives the real-time monitoring data of the vehicle speed, ambient temperature and compressor speed output by the data monitoring module. The control module queries the relationship table 10 according to the real-time monitoring data and the heat pump detection data output by the self-test module, and obtains the optimal grille opening and fan duty cycle corresponding to the current vehicle speed, current ambient temperature, current air conditioning system high pressure value and current compressor speed of the vehicle in the air conditioning heat pump state, and outputs the optimal control signal to the drive module after analyzing and processing the query results. The drive module adjusts the active grille opening and fan duty cycle of the vehicle according to the optimal control signal.

[0027] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for controlling an active air intake grille and a front-end cooling fan, characterized in that: The following methods are included: Under different ambient temperatures and vehicle speeds of the vehicle, the vehicle drag coefficient values, the airflow pressure difference values ​​before and after the fan, and the air volume values ​​of the radiator passing through the front end of the fan are collected under different combinations of grille openings and fan duty cycles. The synthetic relationship table 1 of ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient values, airflow pressure difference values ​​before and after the fan, and air volume values ​​of the radiator passing through the front end of the fan is shown; According to the airflow pressure difference before and after the fan corresponding to different ambient temperatures and different fan duty cycles in relation table 1, the corresponding fan energy consumption value is calculated, and the ambient temperature, fan duty cycle, airflow pressure difference before and after the fan and fan energy consumption value are synthesized in relation table 2; According to the relationship table 1, the compressor energy consumption value of the air conditioning system under different ambient temperatures, different compressor speeds and air conditioning system pressure values ​​is calculated by the radiator air volume value at the front end of the fan, and the ambient temperature, radiator air volume value, air conditioning system pressure value, compressor speed and compressor energy consumption value are synthesized in the relationship table 3; Different vehicle speeds, ambient temperatures, air-conditioning system pressure values ​​and compressor speeds are matched with the optimal grille opening and fan duty cycle control combination according to the principle of optimal vehicle energy consumption through relationship tables 1, 2 and 3. Vehicle speed, ambient temperature, air-conditioning system pressure value and compressor speed as well as optimal grille opening and fan duty cycle are synthesized into relationship table 4. According to the vehicle drag coefficient value in relationship table 1, the fan energy consumption value in relationship table 2, the compressor energy consumption value in relationship table 3 and the one-dimensional simulation model of the vehicle energy consumption system, the optimal grille opening and fan duty cycle control combination is obtained according to the optimal vehicle energy consumption.

2. The active air intake grille and front-end cooling fan control method according to claim 1, characterized in that: Based on the above control method, according to relationship table 1, relationship table 2 and relationship table 3, the fan energy consumption values ​​and the compressor energy consumption values ​​under different ambient temperatures, different vehicle speeds, different air-conditioning system pressure values ​​and different compressor speeds are queried respectively, and the real-time data of the vehicle such as the real-time ambient temperature, real-time vehicle speed, real-time air-conditioning system pressure value and real-time compressor speed of the vehicle are collected, and according to the principle of optimal energy consumption of the whole vehicle, relationship table 4 is queried to retrieve the optimal grille opening and the optimal fan duty cycle.

3. The active air intake grille and front-end cooling fan control method according to claim 1, characterized in that: The corresponding relationship among the ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, air flow pressure difference value before and after the fan, and radiator air volume value through the front end of the fan in the relationship table 1 is obtained through three-dimensional simulation of vehicle dynamics.

4. The active air intake grille and front-end cooling fan control method according to claim 1, characterized in that: The correspondence between the fan duty cycle, the airflow pressure difference before and after the fan, and the fan energy consumption value in the relationship table 2 is obtained through a fan bench test, and the relationship between the fan duty cycle, the airflow pressure difference before and after the fan, and the fan energy consumption value is further calculated based on the experimental data.

5. The method for controlling an active air intake grille and a front-end cooling fan according to claim 1, characterized in that: The data relationship between the ambient temperature, radiator air volume, air conditioning system pressure value, compressor speed and compressor energy consumption value in the relationship table 3 is obtained through one-dimensional simulation of the thermal management system or a system bench, and the data is further calculated to obtain the corresponding compressor energy consumption value.

6. The method for controlling an active air intake grille and a front-end cooling fan according to claim 5, characterized in that: The air conditioning system pressure values ​​in the relationship table 3 are divided into air conditioning system low pressure values ​​and air conditioning system high pressure values. When the air conditioning is in cooling mode, the air conditioning system low pressure value is queried; when the air conditioning is in heat pump mode, the air conditioning system high pressure value is queried.

7. The active air intake grille and front-end cooling fan control method according to claim 6, characterized in that: When the air conditioner is in cooling mode, the corresponding compressor energy consumption value is queried according to the low pressure value of the air conditioning system; when the air conditioner is in heat pump mode, the compressor energy consumption value at this time is queried according to the high pressure value of the air conditioning system.

8. The method for controlling an active air intake grille and a front-end cooling fan according to claim 1, characterized in that: The grille opening includes fully closed, low, high and fully open. The fully closed is 0%, the low is 30%, the high is 60% and the fully open is 90%. Different grille openings correspond to different fan duty cycles.

9. The active air intake grille and front-end cooling fan control method according to claim 8, characterized in that: The fan duty cycle includes 0% duty cycle, low duty cycle 20%, medium duty cycle 40%, medium-high duty cycle 70%, and high duty cycle 95%; when the grille opening is fully open, the fan can control the duty cycle to 0%, 20%, 40%, 70%, and 95%; when the grille opening is other openings, the fan duty cycle is controlled to 0%.

10. An active air intake grille and front cooling fan control system, based on an active air intake grille and front cooling fan control method according to any one of claims 1 to 9, characterized in that: It includes data acquisition module, data processing module and optimization module; The data acquisition module is used to collect the vehicle drag coefficient value, the airflow pressure difference value before and after the fan, and the air volume value of the radiator passing through the front end of the fan under different ambient temperatures and different vehicle speeds of the vehicle. The ambient temperature, vehicle speed, grille opening, fan duty cycle, vehicle drag coefficient value, airflow pressure difference value before and after the fan, and radiator air volume value passing through the front end of the fan are synthesized in Table 1; The data processing module is used to calculate the corresponding fan energy consumption value according to the airflow pressure difference value before and after the fan corresponding to different fan duty cycles and the vehicle drag coefficient in the relationship table 1, and the ambient temperature, fan duty cycle, the airflow pressure difference value before and after the fan, and the fan energy consumption value are synthesized in the relationship table 2; according to the relationship table 1, the compressor energy consumption value of the air conditioning system under different ambient temperatures, different air conditioning system pressure values, and different compressor speeds is calculated by the radiator air volume value at the front end of the fan, and the ambient temperature, radiator air volume value, air conditioning system pressure value, compressor speed, and compressor energy consumption value are synthesized in the relationship table 3; The optimization module is used to collect the real-time data of the vehicle such as the real-time ambient temperature, real-time vehicle speed, real-time air-conditioning system pressure value, real-time compressor speed, and the energy consumption optimization principle, and query the relationship table 4 to retrieve the optimal grille opening and the optimal fan duty cycle.

Images