Control method and system of active grille shutter for pure electric vehicle

Abstract

The application provides a control method and system of a pure electric vehicle active air intake grille, and belongs to the technical field of new energy vehicles. The method comprises the following processes: obtaining a wind amount difference value according to a real-time vehicle wind amount demand and a vehicle theoretical air intake amount; obtaining a P value of a PI controller according to a current vehicle speed and the wind amount difference value; obtaining an I value of the PI controller according to the current vehicle speed, the wind amount difference value and the obtained P value; obtaining a corresponding active air intake grille opening demand according to the I value after maximum value limitation, and obtaining a final active air intake grille opening after correcting the active air intake grille opening demand. The application introduces the concept of a real-time vehicle demand wind amount, adaptively improves the application of a PI algorithm, and accurately outputs the active air intake grille angle demand according to the influence of the head wind caused by the vehicle speed through closed-loop control of the active air intake grille angle demand.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a control method and system for an active air intake grille of a pure electric vehicle. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the development of automotive technology and users' increasing demands for vehicle energy efficiency, more and more models on the market are using active grille shutters. Compared to models without active grille shutters, those equipped with active grille shutters can completely close the grille when there is no need for airflow, effectively reducing air resistance during driving and thus reducing overall vehicle energy consumption to some extent.

[0004] The inventors discovered that most current control methods for active air intake grilles use open-loop control, which often fails to provide on-demand and precise control, making it difficult to fully realize the role of active air intake grilles in reducing overall vehicle energy consumption. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a control method and system for an active air intake grille in pure electric vehicles. It introduces the concept of real-time airflow demand of the entire vehicle, adaptively improves the application of the PI algorithm, and achieves closed-loop control of the active air intake grille angle demand by comprehensively considering the influence of oncoming wind caused by vehicle speed. This enables the output of the active air intake grille angle demand on demand and with precision.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a control method for an active air intake grille in a pure electric vehicle.

[0008] A control method for an active grille shutter in a pure electric vehicle includes the following steps:

[0009] The air volume difference is obtained by comparing the real-time air volume requirement of the vehicle with the theoretical air volume of the vehicle.

[0010] The P value of the PI controller is obtained based on the vehicle's current speed and the difference in air volume.

[0011] Based on the vehicle's current speed, the airflow difference, and the obtained P value, the I value of the PI controller is obtained;

[0012] Based on the I value after the maximum value limit, the corresponding active air intake grille opening requirement is obtained. After correcting the active air intake grille opening requirement, the final active air intake grille opening is obtained.

[0013] As a further limitation of the first aspect of the present invention, the real-time air volume requirement of the whole vehicle is the maximum value among the air volume requirement of the air conditioning system, the air volume requirement of the electric drive cooling circuit, and the air volume requirement of the battery cooling circuit.

[0014] As a further limitation of the first aspect of the present invention, the P value of the PI controller is obtained by looking up a table based on the difference between the actual vehicle speed and the air volume.

[0015] As a further limitation of the first aspect of the present invention, the I value of the PI controller is obtained by using the P value as the superposition amount calculated by I based on the difference between the current vehicle speed and the air volume.

[0016] As a further limitation of the first aspect of the present invention, the maximum value of I is set to 90, and when the value of I is greater than 90, it is set to 90.

[0017] As a further limitation of the first aspect of the invention, the requirement for the opening degree of the active air intake grille is modified, including:

[0018] When the cooling fan fails, the active air intake grille requires maximum opening.

[0019] When the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires the maximum opening.

[0020] When the electric water pump malfunctions, the active air intake grille requires maximum opening.

[0021] When the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires the maximum opening.

[0022] Secondly, the present invention provides a control system for an active grille shutter in a pure electric vehicle.

[0023] A control system for an active grille shutter in a pure electric vehicle, comprising:

[0024] The air volume difference generation module is configured to: obtain the air volume difference based on the real-time air volume requirement of the vehicle and the theoretical air volume of the vehicle;

[0025] The P-value generation module is configured to obtain the P-value of the PI controller based on the vehicle's current speed and the airflow difference.

[0026] The I-value generation module is configured to: obtain the I-value of the PI controller based on the vehicle's current speed, the airflow difference, and the obtained P-value;

[0027] The opening generation module is configured to: obtain the corresponding active air intake grille opening requirement based on the I value after the maximum value limit, and obtain the final active air intake grille opening after correcting the active air intake grille opening requirement.

[0028] As a further limitation of the second aspect of the present invention, the opening generation module modifies the opening requirement of the active air intake grille, including:

[0029] When the cooling fan fails, the active air intake grille requires maximum opening.

[0030] When the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires the maximum opening.

[0031] When the electric water pump malfunctions, the active air intake grille requires maximum opening.

[0032] When the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires the maximum opening.

[0033] Thirdly, the present invention provides a computer-readable storage medium having a program stored thereon, characterized in that, when executed by a processor, the program implements the steps in the control method for the active air intake grille of a pure electric vehicle as described in the first aspect of the present invention.

[0034] Fourthly, the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps in the control method for the active grille shutter of a pure electric vehicle as described in the first aspect of the present invention.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. This invention innovatively proposes a control strategy for an active air intake grille of a pure electric vehicle, introduces the concept of real-time air volume demand of the whole vehicle, and adaptively improves the application of the PI algorithm. By performing closed-loop control on the active air intake grille angle demand and comprehensively considering the influence of the oncoming wind caused by vehicle speed, the active air intake grille angle demand can be output accurately and on demand.

[0037] 2. This invention innovatively proposes a control strategy for an active air intake grille in pure electric vehicles. When the cooling fan malfunctions, the active air intake grille requires maximum opening; when the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires maximum opening; when the electronic water pump malfunctions, the active air intake grille requires maximum opening; when the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires maximum opening, thus ensuring control requirements under abnormal conditions.

[0038] 3. This invention innovatively proposes a control strategy for an active air intake grille in pure electric vehicles. The maximum value of I is set to 90. When the I value is greater than 90, it is set to 90. Effectively limiting the output of the I value can more conveniently control the active air intake grille and improve the control accuracy.

[0039] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0041] Figure 1 This is a flowchart illustrating the control method for the active grille shutter of a pure electric vehicle provided in Embodiment 1 of the present invention.

[0042] Figure 2 This is a flowchart illustrating the control system for the active grille shutter of a pure electric vehicle provided in Embodiment 2 of the present invention. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] Example 1:

[0047] Embodiment 1 of this invention provides a method for an active grille shutter on a pure electric vehicle. First, the real-time required airflow for the entire vehicle is calculated. Then, based on the actual vehicle speed and the required opening angle of the active grille, the theoretical airflow for the entire vehicle is calculated. Based on the difference in airflow between these two values, the required opening angle of the active grille is calculated using a specific PI control algorithm. Finally, the opening angle of the active grille is adjusted according to the fault conditions of the thermal management system to obtain the final required opening angle of the active grille. Specifically, as shown... Figure 1 As shown, the process includes the following:

[0048] S1: Calculated by multiplying the real-time air volume requirement of the entire vehicle by 1.

[0049] Based on the actual working and enabling status of each circuit of the thermal management system, the air volume requirements of the air conditioning system, the air volume requirements of the electric drive cooling circuit, and the air volume requirements of the battery cooling circuit are processed by taking the largest value, and the real-time air volume requirement of the whole vehicle X1 is calculated.

[0050] S2: Calculation of theoretical air intake volume of the whole vehicle x2

[0051] By referring to the table based on the actual vehicle speed and the required opening of the active air intake grille, the theoretical air intake volume of the vehicle is obtained as X2.

[0052] S3: Calculation of air volume difference ΔX

[0053] Based on the real-time air volume requirement X1 of the vehicle calculated by S2 and the theoretical air volume X2 of the vehicle, the air volume difference ΔX is calculated using the formula ΔX=X1-X2.

[0054] S4: P-value calculation

[0055] Based on the vehicle's actual speed and the airflow difference ΔX obtained in the previous step, the P value is obtained by referring to the table.

[0056] S5: I-value calculation

[0057] The P value obtained in S4 is used as the superposition amount for I calculation to obtain the I value. In this case, the I value is also calculated based on the experience database, combined with the P value, the actual vehicle speed and the air volume difference ΔX obtained in the previous step to obtain an optimal value in the database.

[0058] S6: Output limit for I value

[0059] Limit the maximum value of the output I value; the maximum value is set to 90.

[0060] S7: Active grille opening calculation

[0061] Assign the restricted I value from S6 to the active air intake grille opening requirement X.

[0062] S8: Corrects the output active air intake grille opening requirement.

[0063] ① When the cooling fan malfunctions, the active air intake grille requires maximum opening;

[0064] ②When the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires the maximum opening.

[0065] ③ When the electronic water pump malfunctions, the active air intake grille requires maximum opening.

[0066] ④ When the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires the maximum opening.

[0067] S9: Outputs the final active grille opening.

[0068] The final value obtained through the above calculations is the final requirement for the opening of the active air intake grille, which is then output to the active air intake grille actuator.

[0069] Example 2:

[0070] like Figure 2 As shown, Embodiment 2 of the present invention provides a control system for an active grille shutter of a pure electric vehicle, comprising:

[0071] The air volume difference generation module is configured to: obtain the air volume difference based on the real-time air volume requirement of the vehicle and the theoretical air volume of the vehicle;

[0072] The P-value generation module is configured to obtain the P-value of the PI controller based on the vehicle's current speed and the airflow difference.

[0073] The I-value generation module is configured to: obtain the I-value of the PI controller based on the vehicle's current speed, the airflow difference, and the obtained P-value;

[0074] The opening generation module is configured to: obtain the corresponding active air intake grille opening requirement based on the I value after the maximum value limit, and obtain the final active air intake grille opening after correcting the active air intake grille opening requirement.

[0075] The air volume difference generation module specifically includes: based on the actual working and enabling status of each circuit of the thermal management system, taking the largest value of the air volume demand of the air conditioning system, the air volume demand of the electric drive cooling circuit and the air volume demand of the battery cooling circuit, and calculating the real-time air volume demand of the whole vehicle X1.

[0076] By looking up the table based on the actual vehicle speed and the required opening of the active air intake grille, the theoretical air intake volume X2 of the vehicle is obtained. Based on the real-time air volume requirement X1 of the vehicle calculated by S2 and the theoretical air intake volume X2 of the vehicle, the air volume difference ΔX is calculated using the formula ΔX=X1-X2.

[0077] The P-value generation module specifically includes: obtaining the P-value by looking up a table based on the vehicle's actual speed and the obtained airflow difference ΔX.

[0078] The I-value generation module specifically includes: using the calculated P-value as the superposition amount for I-value calculation, calculating the I-value. In this case, the I-value calculation is also based on an experience database, combining the P-value, the actual vehicle speed, and the air volume difference ΔX obtained in the previous step to obtain an optimal value from the database, and limiting the maximum value of the output I-value, which is set to 90.

[0079] The airflow difference generation module specifically includes: assigning the limited I value to the active air intake grille opening requirement X, and correcting the output active air intake grille opening requirement, including:

[0080] ① When the cooling fan malfunctions, the active air intake grille requires maximum opening;

[0081] ②When the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires the maximum opening.

[0082] ③ When the electronic water pump malfunctions, the active air intake grille requires maximum opening.

[0083] ④ When the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires the maximum opening.

[0084] The final value obtained through the above calculations is the final requirement for the opening of the active air intake grille, which is then output to the active air intake grille actuator.

[0085] Example 3:

[0086] Embodiment 3 of the present invention provides a computer-readable storage medium having a program stored thereon, characterized in that, when the program is executed by a processor, it implements the steps in the control method for the active air intake grille of a pure electric vehicle as described in Embodiment 1 of the present invention.

[0087] Example 4:

[0088] Embodiment 4 of the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the control method for the active air intake grille of a pure electric vehicle as described in Embodiment 1 of the present invention.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for an active grille shutter in a pure electric vehicle, characterized in that, The process includes the following: The air volume difference is obtained by comparing the real-time air volume requirement of the vehicle with the theoretical air intake volume of the vehicle. The real-time air volume requirement of the vehicle is the maximum value among the air volume requirements of the air conditioning system, the air volume requirements of the electric drive cooling circuit, and the air volume requirements of the battery cooling circuit. The theoretical air intake volume of the vehicle is obtained by looking up the table using the actual vehicle speed and the required opening of the active air intake grille. The P value of the PI controller is obtained based on the vehicle's current speed and the difference in air volume. Based on the vehicle's current speed, the airflow difference, and the obtained P value, the I value of the PI controller is obtained; Based on the I value after the maximum limit, the corresponding active air intake grille opening requirement is obtained. After correcting the active air intake grille opening requirement, the final active air intake grille opening is obtained. The requirements for the opening angle of the active air intake grille have been revised, including: When the cooling fan fails, the active air intake grille requires maximum opening. When the air conditioning system pressure exceeds the maximum allowable pressure value, the active air intake grille requires the maximum opening. When the electric water pump malfunctions, the active air intake grille requires maximum opening. When the cooling system water temperature exceeds the maximum allowable value, the active air intake grille requires the maximum opening.

2. The control method for the active grille shutter of a pure electric vehicle as described in claim 1, characterized in that, Based on the difference between the vehicle's actual speed and the air volume, the P value of the PI controller is obtained by looking up the table.

3. The control method for the active grille shutter of a pure electric vehicle as described in claim 1, characterized in that, Based on the difference between the vehicle's current speed and airflow, the I value of the PI controller is obtained by using the P value as the superposition quantity for I calculation.

4. The control method for the active grille shutter of a pure electric vehicle as described in claim 1, characterized in that, The maximum value of I is set to 90, and when the value of I is greater than 90, it is set to 90.

5. A control system for an active grille shutter in a pure electric vehicle, characterized in that, The control method for the active grille shutter of a pure electric vehicle according to any one of claims 1-4 includes: The air volume difference generation module is configured to: obtain the air volume difference based on the real-time air volume requirement of the vehicle and the theoretical air volume of the vehicle; The P-value generation module is configured to obtain the P-value of the PI controller based on the vehicle's current speed and the airflow difference. The I-value generation module is configured to: obtain the I-value of the PI controller based on the vehicle's current speed, the airflow difference, and the obtained P-value; The opening generation module is configured to: obtain the corresponding active air intake grille opening requirement based on the I value after the maximum value limit, and obtain the final active air intake grille opening after correcting the active air intake grille opening requirement.

6. A computer-readable storage medium having a program stored thereon, characterized in that, When executed by the processor, the program implements the steps in the control method for the active grille of a pure electric vehicle as described in any one of claims 1-4.

7. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the control method for the active grille of a pure electric vehicle as described in any one of claims 1-4.

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