An automatic control method, system, and vehicle for an auxiliary braking vehicle electric rear wing.

Abstract

This invention discloses an automatic control method, system, and vehicle for an electric rear wing with auxiliary braking, relating to the field of automotive electric rear wing design technology. The method involves: acquiring vehicle speed and braking signals in real time during driving to determine if the triggering conditions for automatic control of the electric rear wing are met; activating the electric rear wing when the activation conditions are met, specifically by determining the opening level of the electric rear wing based on the vehicle speed and braking signals, acquiring the current opening angle position of the electric rear wing, generating a control signal based on the opening level and the current opening angle position, controlling the electric rear wing to perform a corresponding angle change to assist braking, and updating and feeding back the current opening angle position after execution; deactivating the electric rear wing when the deactivation conditions are met. This invention extends the auxiliary braking function based on existing functionality, allowing selection of the optimal electric rear wing opening angle under driving conditions, ensuring stability, safety, and user experience, and effectively reducing braking distance.

Description

Technical Field

[0001] This invention relates to the field of automotive electric rear wing design technology, and in particular to an automatic control method, system and vehicle for an auxiliary braking vehicle electric rear wing. Background Technology

[0002] With the continuous improvement of living standards, the number of cars on the road is increasing, and car safety is receiving more and more attention. Currently, automotive technology is constantly advancing, and the level of vehicle intelligence is becoming increasingly sophisticated, leading to the development of electric rear wings. A rear wing is a component installed at the rear of a vehicle, primarily used to reduce wind resistance at high speeds and improve vehicle stability. Existing electric rear wings can achieve intelligent control. When the vehicle reaches a certain speed at high speeds, the electric rear wing opens at a specific angle through electric control, thereby reducing wind resistance at high speeds, increasing downforce at the rear, thus reducing energy consumption and ensuring vehicle stability.

[0003] However, existing electric rear wing control only considers the stability of the car's ride. This control method does not take into account the effective application of electric rear wings in other functions, and its application scenarios are limited. Summary of the Invention

[0004] To address the shortcomings of the prior art, this invention provides an automatic control method, system, and vehicle for an electric rear wing that assists braking. It expands upon the electric rear wing's functions of reducing wind resistance and improving driving stability by developing its auxiliary braking function. Based on different vehicle speeds and braking signals, it determines and executes a specific opening angle for the electric rear wing, which can increase wind resistance and rear downforce to varying degrees during braking, thereby achieving the effect of auxiliary braking and reducing braking distance.

[0005] In a first aspect, the present invention provides an automatic control method for an electric rear wing of a vehicle that assists in braking.

[0006] An automatic control method for a vehicle's electric rear wing with auxiliary braking includes:

[0007] Real-time acquisition of vehicle speed and braking signals during vehicle operation;

[0008] The system determines whether the triggering conditions for automatic control of the electric rear wing are met based on vehicle speed and braking signals; the triggering conditions include triggering activation conditions and triggering deactivation conditions.

[0009] When the activation conditions are met, the electric rear wing is activated, including: determining the activation level of the electric rear wing based on the vehicle speed and braking signal, obtaining the current activation angle position of the electric rear wing, generating a control signal based on the activation level of the electric rear wing and the current activation angle position, controlling the electric rear wing to perform a corresponding angle change to assist braking, and updating and feeding back the current activation angle position after the execution is completed.

[0010] A further technical solution is to deactivate the electric tail wing when the triggering shutdown conditions are met, including:

[0011] The system obtains the current opening angle position of the electric tail wing, generates a control signal based on the closed state of the electric tail wing and the current opening angle position, and controls the electric tail wing to perform the corresponding angle change. After the change is completed, the system updates and feeds back the current opening angle position.

[0012] A further technical solution is that the braking signal includes a braking start signal and a corresponding braking deceleration; the triggering opening condition is: receiving a braking start signal, and the vehicle speed ≥ 40 km / h and the braking deceleration ≥ 0.6g; the triggering closing condition is: not receiving a braking start signal, and the vehicle speed is zero and the braking deceleration is zero.

[0013] In a further technical solution, the control signal is a drive signal that includes a change value for the electric tail wing angle, wherein the change value for the electric tail wing angle is the difference between the angle position corresponding to the electric tail wing opening level or the electric tail wing closing state and the current opening angle position.

[0014] A further technical solution is that the opening levels of the electric tail wing are divided as follows:

[0015] The driving process of the simulated vehicle under different opening angles of the electric rear wing was obtained to obtain the linear relationship between the opening angle of the electric rear wing and the wind resistance and downforce of the whole vehicle.

[0016] Based on different vehicle speeds and braking deceleration conditions, the required downforce of the entire vehicle for auxiliary braking under different conditions is determined. Combined with the obtained linear relationship, the opening angle of the electric rear wing is classified into different levels.

[0017] A further technical solution is that the electric tail wing opening level is divided into three levels, including:

[0018] The first level is: when the vehicle speed is ≥40km / h and the braking deceleration is ≥0.8g and ≥0.6g, the electric rear wing opens to an angle of 20°;

[0019] The second level is: when the vehicle speed is ≥40km / h and 1.0g > braking deceleration >0.8g, the electric rear wing opens to an angle of 40°;

[0020] The third level is: when the vehicle speed is ≥40km / h and the braking deceleration is ≥1.0g, the electric rear wing opens to an angle of 70°.

[0021] In a further technical solution, the closed state of the electric tail wing is when the opening angle of the electric tail wing is 0.

[0022] Secondly, the present invention provides an automatic control system for an electric rear wing of a vehicle that assists in braking.

[0023] An automatic control system for an electric rear wing that assists braking includes a vehicle controller, a rear wing control unit, and an electric rear wing;

[0024] The vehicle controller is used to acquire vehicle speed and braking signals in real time during vehicle operation, and determine whether the triggering conditions for automatic control of the electric rear wing are met based on the vehicle speed and braking signals, and generate a triggering control command; the triggering conditions include trigger opening conditions and trigger closing conditions.

[0025] The tail wing control unit is used to receive trigger control commands, obtain the current opening angle of the electric tail wing, and generate control signals for the electric tail wing.

[0026] The electric tail fin is used to receive control signals and perform corresponding angle changes according to the control signals to assist braking. After the execution is completed, it updates and feeds back the current opening angle position.

[0027] A further technical solution is that the trigger control command includes the trigger control type and the vehicle's current speed and braking signal; the trigger control type includes trigger on and trigger off.

[0028] When the trigger opening conditions are met, the trigger control type is trigger opening. At this time, the rear wing control unit determines the opening level of the electric rear wing based on the vehicle speed and braking signal, obtains the current opening angle position of the electric rear wing, and then generates a control signal based on the opening level of the electric rear wing and the current opening angle position.

[0029] When the trigger-off condition is met, the trigger control type is trigger-off. At this time, the tail wing control unit obtains the current opening angle position of the electric tail wing and generates a control signal based on the electric tail wing's closed state and the current opening angle position.

[0030] Thirdly, the present invention also provides a vehicle including an electric rear wing, the electric rear wing performing the steps of the method described in the first aspect.

[0031] The above one or more technical solutions have the following beneficial effects:

[0032] 1. This invention proposes an automatic control method, system, and vehicle for an electric rear wing with assisted braking. Building upon the electric rear wing's functions of reducing wind resistance and improving driving stability, it expands upon this function to include assisted braking. Based on different vehicle speeds and braking signals, a specific electric rear wing opening angle is determined and executed. This increases wind resistance and rear downforce during braking to varying degrees, thereby achieving assisted braking and reducing braking distance. The specific rear wing opening angle is selected based on CAE simulation analysis technology, and is further categorized according to different vehicle speeds and deceleration requirements, allowing for the selection of different electric rear wing opening angles.

[0033] 2. In this invention, based on CAE simulation analysis technology, the vehicle driving process is simulated to clarify the linear relationship between the opening angle of the electric rear wing and the wind resistance and rear downforce (i.e., the absolute value of the vehicle's lift). Simultaneously, considering the user experience under braking conditions and different vehicle speeds and braking decelerations, the wind resistance and downforce required for auxiliary braking are clarified. Furthermore, the opening angle of the vehicle's rear wing is categorized into different levels. This allows for the selection of the optimal electric rear wing opening angle under different vehicle speeds and braking decelerations, ensuring stable driving during braking while maintaining a comfortable driving experience for the user, effectively reducing braking distance, and improving driving safety.

[0034] 3. The control method proposed in this invention is achieved by adding software functional units. Through software-level logic control, the active safety function of intelligent auxiliary braking of electric tail wing is added. It can be improved on the basis of existing electric tail wing without any hardware development or increase in component costs. It is low in cost and more applicable. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a flowchart of the automatic control method for the vehicle electric rear wing with auxiliary braking as described in Embodiment 1 of the present invention;

[0037] Figure 2 This is a linear relationship diagram between the opening angle of the electric tail wing and the drag and lift of the vehicle, obtained through simulation in Embodiment 1 of the present invention.

[0038] Figure 3 This is a schematic diagram of the automatic control system for the vehicle electric rear wing with auxiliary braking as described in Embodiment 2 of the present invention;

[0039] Figure 4 This is a logic diagram of the automatic control of the vehicle's electric rear wing in the system described in Embodiment 2 of the present invention. Detailed Implementation

[0040] It should be noted that the following detailed descriptions are exemplary and are intended only to describe specific embodiments and to provide further explanation of the invention, and are not intended to limit the scope of exemplary embodiments 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. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Example 1

[0042] To improve vehicle safety, this embodiment provides an automatic control method for a vehicle's electric rear wing with auxiliary braking, building upon the traditional electric rear wing function. This method develops a hidden intelligent auxiliary braking function within the electric rear wing, thereby enhancing the vehicle's intelligence and, to a certain extent, improving its safety performance. The method proposed in this embodiment defines the electric rear wing function, clarifies the usage scenarios for intelligent auxiliary braking, and defines the conditions for triggering and deactivating this function (these conditions are determined based on vehicle speed and braking signal). Through simulation, the optimal opening angle of the electric rear wing for reducing and increasing wind resistance under different driving conditions is determined, clarifying the functional logic of the intelligent auxiliary braking electric rear wing. The automatic control method for a vehicle's electric rear wing with auxiliary braking proposed in this embodiment, as follows... Figure 1 As shown, it specifically includes:

[0043] Real-time acquisition of vehicle speed and braking signals during vehicle operation;

[0044] The system determines whether the triggering conditions for automatic control of the electric rear wing are met based on vehicle speed and braking signals; the triggering conditions include triggering activation conditions and triggering deactivation conditions.

[0045] When the activation conditions are met, the electric rear wing is activated, including: determining the activation level of the electric rear wing based on the vehicle speed and braking signal, obtaining the current activation angle position of the electric rear wing, generating a control signal based on the activation level of the electric rear wing and the current activation angle position, controlling the electric rear wing to perform a corresponding angle change to assist braking, and updating and feeding back the current activation angle position after the execution is completed.

[0046] Furthermore, the electric tail wing is deactivated when the triggering deactivation conditions are met, including:

[0047] The system obtains the current opening angle position of the electric tail wing, generates a control signal based on the closed state of the electric tail wing and the current opening angle position, and controls the electric tail wing to perform the corresponding angle change. After the change is completed, the system updates and feeds back the current opening angle position.

[0048] The automatic control method for vehicle electric rear wing with auxiliary braking proposed in this embodiment will be described in more detail below.

[0049] In this embodiment, the vehicle speed and braking signals during the vehicle's operation are first acquired in real time. The braking signals include a braking start signal and a corresponding braking deceleration. Then, based on the acquired real-time vehicle speed and braking signals, a judgment is made as to whether the triggering conditions for the automatic control of the electric rear wing are met. The triggering conditions include trigger opening conditions and trigger closing conditions. When a braking start signal is received and the vehicle speed is ≥40km / h and the braking deceleration is ≥0.6g, the trigger opening condition is met. When no braking start signal is received and the vehicle speed is zero and the braking deceleration is zero, the trigger closing condition is met.

[0050] (1) When the triggering conditions are met, the electric tail fin is activated, including:

[0051] The opening level of the electric rear wing is determined based on vehicle speed and braking signals, and the current opening angle position of the electric rear wing is obtained. A control signal is then generated based on the opening level and the current opening angle position. This control signal is a drive signal that includes a change in the electric rear wing angle. This change in the electric rear wing angle is the difference between the angle position corresponding to the opening level and the current opening angle position. For example, if the angle position corresponding to the opening level is 20°, and the current opening angle position is 40°, then the calculated change in the electric rear wing angle is 20° (closed).

[0052] Subsequently, based on the control signals generated above, the electric tail wing is controlled to perform corresponding angle changes to assist braking, and after the execution is completed, the current opening angle position is updated and fed back.

[0053] (2) When the trigger shutdown conditions are met, the electric tail fin is deactivated, including:

[0054] The current opening angle position of the electric rear wing is obtained, and a control signal is generated based on the closed state of the electric rear wing and the current opening angle position. This control signal is a drive signal that includes a change in the electric rear wing angle, which is the difference between the angle position corresponding to the closed state of the electric rear wing and the current opening angle position. The opening angle of the electric rear wing corresponding to the closed state is 0.

[0055] Subsequently, based on the control signals generated above, the electric tail wing is controlled to perform the corresponding angle change, and after the execution is completed, the current opening angle position is updated and fed back.

[0056] In the method proposed in this embodiment, different levels of electric rear wing opening are defined according to different driving conditions. Specifically, the classification of electric rear wing opening levels includes:

[0057] First, CAE simulation technology was used to analyze the driving process of the vehicle under different opening angles of the electric rear wing, obtaining the linear relationship between the electric rear wing opening angle and the wind resistance and vehicle downforce. The obtained linear relationship is as follows: Figure 2 As shown, for a certain vehicle model, the larger the opening angle of the electric rear wing, the greater the downforce of the entire vehicle. For every 1° increase in the opening angle of the electric rear wing, the downforce of the entire vehicle increases by 10N. Based on the specific design of the electric rear wing mechanism for this vehicle model, the maximum opening angle can reach 70°. If the maximum drag of the entire vehicle is required, the angle of the electric rear wing can be set to 70°.

[0058] Secondly, based on different vehicle speeds and braking deceleration conditions, the required downforce of the entire vehicle for auxiliary braking under different conditions is determined (this force can ensure the stability of vehicle driving and the experience of drivers and passengers). Combined with the obtained linear relationship, the opening angle of the electric rear wing is classified into levels.

[0059] In this embodiment, for the simulated vehicle model, the electric rear wing opening level can be divided into three levels, including:

[0060] The first level is: when the vehicle speed is ≥40km / h and the braking deceleration is ≥0.8g and ≥0.6g, the electric rear wing opens to an angle of 20°, at which point it can generate about 200N of downforce for the entire vehicle;

[0061] The second level is: when the vehicle speed is ≥40km / h and 1.0g > braking deceleration >0.8g, the electric rear wing opens to an angle of 40°, at which point it can generate approximately 377N of downforce.

[0062] The third level is: when the vehicle speed is ≥40km / h and the braking deceleration is ≥1.0g, the electric rear wing opens to an angle of 70°, at which point it can generate approximately 617N of downforce.

[0063] The above classification is based on the simulated vehicle model. In reality, different vehicle models can be further classified into multiple levels and have different calibration thresholds set according to their own characteristics.

[0064] Example 2

[0065] This embodiment provides an automatic control system for a vehicle's electric rear wing that assists braking. The system includes a vehicle controller, a rear wing control unit, and an electric rear wing (i.e., an actuator), wherein:

[0066] The vehicle controller is used to acquire vehicle speed and braking signals in real time during vehicle operation, and determine whether the triggering conditions for automatic control of the electric rear wing are met based on the vehicle speed and braking signals, and generate triggering control commands; the triggering conditions include trigger opening conditions and trigger closing conditions.

[0067] The tail wing control unit is used to receive trigger control commands, obtain the current opening angle of the electric tail wing, and generate control signals for the electric tail wing.

[0068] The electric tail wing receives control signals and performs corresponding angle changes to assist braking. After execution, it updates and feeds back the current opening angle position.

[0069] Furthermore, the trigger control command includes the trigger control type, the vehicle's current speed, and the braking signal. The trigger control type includes trigger on and trigger off.

[0070] When the trigger opening conditions are met, the trigger control type is trigger opening. At this time, the rear wing control unit determines the opening level of the electric rear wing based on the vehicle speed and braking signal, obtains the current opening angle position of the electric rear wing, and then generates a control signal based on the opening level of the electric rear wing and the current opening angle position.

[0071] When the trigger-off condition is met, the trigger control type is trigger-off. At this time, the tail wing control unit obtains the current opening angle position of the electric tail wing and generates a control signal based on the electric tail wing's closed state and the current opening angle position.

[0072] Specifically, such as Figure 3 As shown, the vehicle controller 001 collects and acquires real-time vehicle speed and braking signals during vehicle operation, and determines whether the conditions for triggering the automatic control of the electric rear wing are met based on the collected signals. When the conditions are met, a trigger control command is generated and sent to the rear wing control unit. The rear wing control unit 002 receives the corresponding trigger control command, clarifies whether the trigger control type is triggering on or triggering off, and acquires the current vehicle speed and braking signals. Then, it diagnoses and acquires the current opening angle of the electric rear wing, and generates a control signal (or control command) for the electric rear wing based on the vehicle speed and braking signals, and sends the control command to the electric rear wing. The electric rear wing 003 executes the relevant command actions according to the received control command, and after completion, updates and feeds back the current opening angle position to the rear wing control unit as the basis for the next diagnosis of the rear wing control unit.

[0073] That is, in this embodiment, the entire control logic is as follows: Figure 4As shown, the vehicle controller monitors and acquires instantaneous signals such as vehicle speed and braking in real time, and determines whether the intelligent auxiliary braking function of the electric rear wing is triggered, that is, whether the triggering conditions for the automatic control of the vehicle's rear wing are met. For example, if vehicle speed and braking signals are received, and the vehicle speed is ≥40km / h and the braking deceleration is ≥0.6g, the triggering conditions are met, and the electric rear wing can be activated. The vehicle controller generates a trigger control command and sends it to the rear wing control unit. The rear wing control unit receives the command sent by the vehicle controller, diagnoses the status of the electric rear wing (i.e., the current opening angle position), and generates the electric rear wing... The vehicle controller sends control commands to the electric rear wing. The electric rear wing executes the commands, such as fully opening to its maximum operating angle of -70°. After execution, it updates and feeds back the current opening angle position to the rear wing control unit as a diagnostic basis for the next action. When there is no brake signal, the vehicle speed is zero, and the braking deceleration is zero, the vehicle controller determines that the trigger closing condition is met, generates a trigger control command, and sends it to the rear wing control unit. The rear wing control unit sends a control command to the electric rear wing to close it, and after closing, feeds back the current opening angle position to the rear wing control unit. Throughout the entire driving process, this method is continuously executed, automatically selecting and executing the optimal electric rear wing opening angle under different vehicle speeds and braking deceleration conditions. This ensures smooth driving during braking, protects the user's driving and riding experience, effectively reduces braking distance, and improves driving safety.

[0074] Example 3

[0075] This embodiment provides a vehicle including an electric rear wing, which performs the steps of the automatic control method for an electric rear wing of a vehicle with assisted braking as proposed in Embodiment 1.

[0076] The steps and methods involved in Examples 2 and 3 above correspond to those in Example 1. For specific implementation details, please refer to the relevant description section of Example 1.

[0077] Those skilled in the art will understand that the various units or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit units, or multiple units or steps can be fabricated as a single integrated circuit unit. The present invention is not limited to any particular combination of hardware and software.

[0078] The above description is only a preferred embodiment of the present invention. Although the specific embodiments of the present invention have been described in conjunction with the accompanying drawings, they are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the present invention.

Claims

1. An automatic control method of an electrically driven tail wing of a vehicle for assisting braking, characterized by, The method comprises: acquiring vehicle speed and brake signal in real time during vehicle driving; judging whether the trigger condition of automatic control of the electric spoiler is met according to the vehicle speed and the brake signal; the trigger condition comprises a trigger opening condition and a trigger closing condition; when the trigger opening condition is met, the electric spoiler is started, which comprises: determining the electric spoiler opening level according to the vehicle speed and the brake signal, acquiring the current opening angle position of the electric spoiler, and then generating a control signal according to the electric spoiler opening level and the current opening angle position to control the electric spoiler to perform corresponding angle change to assist braking, and updating and feeding back the current opening angle position after the execution is completed; the brake signal comprises a brake starting signal and corresponding brake deceleration; the trigger opening condition is that the brake starting signal is received, and the vehicle speed is greater than or equal to 40 km / h and the brake deceleration is greater than or equal to 0.6g; and the trigger closing condition is that the brake starting signal is not received, and the vehicle speed is zero and the brake deceleration is zero; the electric spoiler opening level is divided by: simulating the driving process of the vehicle in different opening angle states of the electric spoiler to obtain the linear relationship between the opening angle of the electric spoiler and the wind resistance and the downforce of the vehicle; determining the downforce of the vehicle required for assisting braking in different working conditions according to different vehicle speeds and brake decelerations, and combining the obtained linear relationship to divide the opening angle of the electric spoiler into levels; the electric spoiler opening level is divided into three levels, which comprise: the first level is that when the vehicle speed is greater than or equal to 40 km / h and the brake deceleration is greater than or equal to 0.6g and less than or equal to 0.8g, the opening angle of the electric spoiler is 20°; the second level is that when the vehicle speed is greater than or equal to 40 km / h and the brake deceleration is greater than 0.8g and less than 1.0g, the opening angle of the electric spoiler is 40°; the third level is that when the vehicle speed is greater than or equal to 40 km / h and the brake deceleration is greater than or equal to 1.0g, the opening angle of the electric spoiler is 70°.

2. The method of claim 1, wherein the method is characterized by: when the trigger closing condition is met, the electric spoiler is closed, which comprises: acquiring the current opening angle position of the electric spoiler, and generating a control signal according to the closing state of the electric spoiler and the current opening angle position to control the electric spoiler to perform corresponding angle change, and updating and feeding back the current opening angle position after the execution is completed.

3. The method of claim 1, wherein the method further comprises: determining whether the vehicle is in a state of deceleration; and if the vehicle is in a state of deceleration, then controlling the electric tail wing to be in a state of being folded. the control signal is a driving signal comprising an electric spoiler angle change value, wherein the electric spoiler angle change value is the difference between the angle position corresponding to the electric spoiler opening level or the electric spoiler closing state and the current opening angle position.

4. The method of claim 2, wherein the method further comprises: determining whether the vehicle is in a state of deceleration; and if the vehicle is in a state of deceleration, then controlling the electric tail wing to be in a state of being folded. the electric spoiler closing state is that the opening angle of the electric spoiler is 0.

5. An automatic control system for an electrically powered tail fin of a vehicle for assisting braking, characterized in that, the vehicle controller, the spoiler control unit and the electric spoiler are comprised; the vehicle controller is used for acquiring vehicle speed and brake signal in real time during vehicle driving, and judging whether the trigger condition of automatic control of the electric spoiler is met according to the vehicle speed and the brake signal, and generating a trigger control instruction; the trigger condition comprises a trigger opening condition and a trigger closing condition; the spoiler control unit is used for receiving the trigger control instruction, acquiring the current opening angle of the electric spoiler, and generating a control signal of the electric spoiler; the electric spoiler is used for receiving the control signal, and performing corresponding angle change to assist braking according to the control signal, and updating and feeding back the current opening angle position after the execution is completed. The brake signal includes a brake start signal and a corresponding brake deceleration; The trigger opening condition is that the brake start signal is received, and the vehicle speed is greater than or equal to 40km / h and the brake deceleration is greater than or equal to 0.6g; the trigger closing condition is that the brake start signal is not received, and the vehicle speed is zero and the brake deceleration is zero; The division of the electric tail wing opening level is: simulating the driving process of the vehicle in different opening angle states of the electric tail wing, obtaining the linear relationship between the opening angle of the electric tail wing and the wind resistance and the downforce of the vehicle; according to different vehicle speed and brake deceleration conditions, determining the downforce of the vehicle required by the auxiliary brake in different conditions, and combining the obtained linear relationship, the opening angle of the electric tail wing is divided into levels; The electric tail wing opening level is divided into three levels, including: The first level is: when the vehicle speed is greater than or equal to 40km / h and the brake deceleration is greater than or equal to 0.6g and less than or equal to 0.8g, the opening angle of the electric tail wing is 20°; The second level is: when the vehicle speed is greater than or equal to 40km / h and the brake deceleration is greater than 0.8g and less than 1.0g, the opening angle of the electric tail wing is 40°; The third level is: when the vehicle speed is greater than or equal to 40km / h and the brake deceleration is greater than or equal to 1.0g, the opening angle of the electric tail wing is 70°.

6. The electrically powered automatic control system for a supplemental braking vehicle tail fin of claim 5, wherein, The trigger control instruction includes a trigger control type and the current vehicle speed and brake signal; the trigger control type includes trigger opening and trigger closing; When the trigger opening condition is met, the trigger control type is trigger opening, at this time the tail wing control unit determines the electric tail wing opening level according to the vehicle speed and the brake signal, and obtains the current opening angle position of the electric tail wing, and then generates a control signal according to the electric tail wing opening level and the current opening angle position; When the trigger closing condition is met, the trigger control type is trigger closing, at this time the tail wing control unit obtains the current opening angle position of the electric tail wing, and generates a control signal according to the electric tail wing closing state and the current opening angle position.

7. A vehicle characterized by The vehicle including an electric tail wing, the electric tail wing performs the steps of the vehicle electric tail wing automatic control method for auxiliary braking according to any one of claims 1-4.

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