Active turbulent flow device for automobile rear bumper and working method

Abstract

The invention discloses an active turbulent flow device for an automobile rear bumper and a working method.The device comprises a first air bag and a second air bag, and the first air bag and the second air bag are installed at the two ends of the automobile rear bumper through a first air bag base and a second air bag base correspondingly; the first air bag base and the second air bag base are connected with an air pump through air pipes, the air pump inflates and exhausts the first air bag and the second air bag, the state that the air bags stretch out of the rear bumper is changed, the outer end face of the first air bag and the outer end face of the second air bag are each provided with a rear bumper outer turbulent flow cover plate, and in the air exhausting state, the rear bumper outer turbulent flow cover plate covers the first air bag and the second air bag. The rear bumper outer turbulent flow cover plate is flush with the surface of the automobile body. The air pump can be automatically controlled to be in different working states through vehicle speed information input, and then the air bag is inflated or deflated, so that the form of the active turbulent flow device is changed, and the active turbulent flow device can be selected to be opened or closed according to the vehicle speed.

Description

Technical Field

[0001] The invention relates to the technical field of automobile spoiler devices, and in particular to an active spoiler device for an automobile rear bumper and a working method thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the requirements for energy conservation and emission reduction of traditional fuel vehicles and extension of driving range of electric vehicles are becoming more and more stringent. Reducing aerodynamic drag is an economical technology because the cost of reducing aerodynamic drag is relatively low compared with improving the efficiency of the engine and powertrain system. From the perspective of the composition of aerodynamic drag, 85% of the total aerodynamic drag of a car is pressure difference drag, of which 9% comes from the front end of the car body and 91% comes from the rear end of the car body.

[0004] The rear bumper spoiler of a car is an important part of the rear of the car. It is designed according to the principles of aerodynamics and aims to optimize the air flow of the vehicle when it is driving at high speed and improve the performance and stability of the vehicle. If the rear bumper of the car is designed to be too round for the overall shape, the airflow of the rear bumper will continue to flow on the surface of the car body due to the Coanda effect, with a high flow rate, forming a low pressure on the surface of the car body, resulting in poor wind resistance. Therefore, it is necessary to set a spoiler on the rear bumper of the car. The rear bumper spoiler has many forms, including but not limited to rear spoiler tail, rear spoiler diffuser, rear spoiler guide fin, etc. These devices may differ in shape, size and installation method, but the common goal is to optimize the airflow at the rear of the vehicle. The problem with the existing spoiler is that the spoiler is generally fixed in shape. After the design and production are completed, it is not convenient to adjust the rear spoiler assembly, so it is not convenient to adjust the angle of the spoiler assembly according to different wind directions. In addition, due to different vehicle speeds, the required shape of the spoiler is also different. The existing spoiler cannot adjust the shape of the spoiler according to the vehicle speed. Summary of the invention

[0005] The purpose of the present invention is to provide an active spoiler device and a working method for a rear bumper of an automobile. By inputting vehicle speed information, an air pump is automatically controlled to be in different working states, thereby inflating or deflating the airbag, thereby changing the shape of the active spoiler device. The active spoiler device can be turned on or off according to the vehicle speed.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides an active spoiler device for a rear bumper of an automobile, comprising a first airbag and a second airbag, wherein the first airbag and the second airbag are respectively installed at two ends of the rear bumper of the automobile through a first airbag base and a second airbag base, wherein the first airbag base and the second airbag base are connected to an air pump through an air pipe, and the air pump inflates and deflates the first airbag and the second airbag to change the state of the airbag extending from the rear bumper, and a rear spoiler outer spoiler cover is provided on the outer end surfaces of the first airbag and the second airbag, and in the deflated state, the rear spoiler outer spoiler cover is flush with the surface of the vehicle body.

[0008] As a further technical solution, the air pump is electrically connected to the controller, and the air pipes connecting the first airbag and the second airbag are both provided with pressure sensors and solenoid valves, and the pressure sensors and solenoid valves are both electrically connected to the controller.

[0009] As a further technical solution, the controller is connected to the vehicle ECU, and the vehicle ECU obtains vehicle speed information in real time and transmits the vehicle speed information to the controller.

[0010] As a further technical solution, the airbag base is made of polypropylene, the airbag is fixed to the airbag base by adhesive, a through hole is provided on the airbag base, and the air inlet of the airbag is connected to the trachea through the through hole.

[0011] As a further technical solution, the airbag is made of rubber material and is a retractable rectangular parallelepiped structure.

[0012] As a further technical solution, a through hole is provided at the position where the airbag is installed in the rear bumper, and the shape of the through hole matches the shape of the rear outer spoiler cover. The rear outer spoiler cover is hingedly connected to the rear bumper at the side close to the front of the vehicle, so that the airbag extends out of the car bumper in a triangular shape after being inflated.

[0013] As a further technical solution, the air pump is provided with a first air port and a second air port, the first air port is connected to the air pipe, the second air port is connected to the outside air, and the second air port is filled with sponge.

[0014] As a further technical solution, the outer end surface of the airbag is fixed to the rear outer spoiler cover by gluing.

[0015] In a second aspect, an embodiment of the present invention provides a working method of an active spoiler device for a rear bumper of an automobile, comprising the following steps:

[0016] Get the current speed of the car in real time and determine whether the speed is greater than 80kph;

[0017] If so, the air is inflated by an air pump until the pressure in the first airbag and the second airbag reaches 0.3 bar, so that the first airbag and the second airbag extend from the bumper of the car to produce a spoiler effect;

[0018] If not, air is pumped out through an air pump until the pressure in the first airbag and the second airbag is negative, so that the rear spoiler cover is flush with the surface of the vehicle body.

[0019] As a further technical solution, the controller controls the air pump according to the acquired vehicle speed information and airbag pressure information, so that the first airbag and the second airbag are within a set air pressure range.

[0020] The beneficial effects of the above embodiments of the present invention are as follows:

[0021] The active spoiler device for the rear bumper of a car provided by the present invention can automatically control the air pump to be in different working states through the input of vehicle speed information, thereby inflating or evacuating the airbag. Since the present invention adopts airbag inflation, the device has a simple structure, a small number of parts, and no complex motion mechanism. During the inflation process, the pressure changes evenly, and there is no problem that the expansion strokes of different areas need to be synchronized. In addition, the inflation method can be achieved slowly, the energy consumption is low, and it can withstand the impact of slight objects and is not easily damaged. Even if the airbag is damaged, it can be simply repaired by glue or the like, and the maintenance cost is very low.

[0022] The working method of the active spoiler device for the rear bumper of an automobile provided by the present invention is to open or close the active spoiler device according to the driving speed of the vehicle. When the speed of the vehicle exceeds a set threshold, an air pump inflates air into the airbag, thereby changing the shape of the leeward end of the vehicle, which can effectively optimize the spoiler at the rear of the vehicle, reduce wind resistance when driving at high speeds, reduce automobile energy consumption, and improve energy utilization. In addition, the present invention adopts an inflatable airbag as the main structural material, has a simple structure, is light in weight, and basically does not increase the weight of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 1 is a schematic structural diagram of an active spoiler device for a rear bumper of an automobile according to Embodiment 1 of the present invention;

[0025] Figure 2 is a schematic diagram of the airbag in the deflated state according to Embodiment 1 of the present invention;

[0026] Figure 3 is a schematic diagram of an airbag in an inflated state according to Embodiment 1 of the present invention;

[0027] Figure 4 is a schematic diagram of the active spoiler device of Example 1 of the present invention when it is closed on a car;

[0028] Figure 5 is a schematic diagram of an active spoiler device according to Embodiment 1 of the present invention when it is opened on a car;

[0029] Figure 6 It is a working flow chart of the active spoiler device of Example 2 of the present invention.

[0030] The schematic diagram is for illustrative purposes only;

[0031] Among them, 1. the first airbag; 2. the second airbag; 3. the first airbag base; 4. the second airbag base; 5. the air pipe; 6. the air pump; 61. the first air port; 62. the second air port; 7. the first rear outer spoiler cover; 8. the second rear outer spoiler cover; 9. the controller; 91. the controller wiring harness; 10. the pressure sensor; 11. the solenoid valve; 12. the rear bumper; 13. the vehicle body. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] Example 1

[0034] In a typical embodiment of the present invention, an active spoiler device for a rear bumper of an automobile is provided, such as Figure 1-Figure 5 As shown, it includes a first airbag 1 and a second airbag 2, which are respectively installed at the two ends of the rear bumper of the automobile through a first airbag base 3 and a second airbag base 4, and the first airbag base 3 and the second airbag base 4 are connected to an air pump 6 through an air pipe 5. The air pump 6 inflates and exhausts the first airbag 1 and the second airbag 2 to change the state of the airbag extending from the rear bumper 12. The first airbag 1 and the second airbag 2 are respectively provided with a first rear outer spoiler cover 7 and a second rear outer spoiler cover 8 on their outer end surfaces. In the exhausted state, the rear outer spoiler cover is flush with the surface of the vehicle body 13.

[0035] In this embodiment, the air pump 6 is electrically connected to the controller 9, and a pressure sensor 10 and a solenoid valve 11 are provided on the air pipe connecting the first airbag 1 and the second airbag 2. The pressure sensor 10 and the solenoid valve 11 are electrically connected to the controller 9. The pressure sensor 10 is used to monitor the pressure inside the first airbag 1 and the second airbag 2 in real time, and the pressure is fed back to the controller. The air pipe connecting the first airbag 1 and the second airbag 2 is opened and closed by the solenoid valve 11.

[0036] In this embodiment, the controller 9 is connected to the vehicle ECU through a controller wiring harness 91. The vehicle ECU obtains vehicle speed information in real time and transmits the vehicle speed information to the controller 9. The controller 9 controls the air pump 6 according to the obtained measured driving speed and the pressure in the first airbag 1 and the second airbag 2.

[0037] In this embodiment, the airbag base is made of polypropylene, the airbag is fixed on the airbag base by adhesive, a through hole is provided on the airbag base, and the air inlet of the airbag is connected to the trachea 5 through the through hole.

[0038] In this embodiment, the airbag is made of rubber material, is a sheet, has a certain toughness, and adopts a retractable rectangular parallelepiped structure. In a specific implementation of this embodiment, the overall length of the airbag is 120mm, the width is 70mm, one end of the airbag is sealed and connected to the airbag base, and the other end is connected to the rear spoiler cover. The airbag is made of rubber material and can expand and deform when inflated. Specifically, the outer end surface of the airbag is fixed to the rear spoiler cover by gluing.

[0039] Furthermore, a through hole is provided at the position where the airbag is installed on the rear bumper, and the shape of the through hole matches the shape of the rear spoiler cover. The side of the rear spoiler cover close to the front of the vehicle is hingedly connected to the rear bumper, so that the airbag extends out of the vehicle bumper in a triangular shape after being inflated. Figure 2 and Figure 3 As shown, the airbag is flush with the vehicle surface when deflated.

[0040] In this embodiment, the air pump adopts an existing dual-function air pump that can be used for vacuuming and inflating. The air pump 6 is provided with a first air port 61 and a second air port 62. The first air port 61 is connected to the trachea 6, and the second air port 62 is connected to the outside air. The second air port 62 is filled with sponge. The second air port 62 is used to discharge the gas in the airbag, or to inhale gas to inflate the airbag. In order to ensure the cleanliness of the inhaled air, the second air port 62 is filled with sponge to filter the inhaled air.

[0041] In this embodiment, the air pipe 5 is made of PVC, which is soft and resistant to bending. It can be detached and replaced, and the length can be selected according to the actual installation situation. The rear spoiler cover 6 can be made of the same material and color as the vehicle body to ensure the overall consistency of the vehicle body.

[0042] The present invention adds an active spoiler device on the side of the rear bumper of the automobile, such as Figure 4 and Figure 5As shown in the figure, it not only ensures the beauty of the shape, but also allows the air to pass through the rear of the car more smoothly when the car is driving normally, reducing the turbulence and resistance of the air at the rear of the vehicle, which is beneficial to reducing the pressure difference between the front and rear of the vehicle and the resistance of the whole vehicle. It can effectively reduce the drag coefficient by about 0.005, increase the cruising range by about 4 kilometers or save about 0.03L of fuel consumption, and reduce carbon emissions by 0.7g.

[0043] Example 2

[0044] In a typical real-time mode of the present invention, a working method of an active spoiler device for a rear bumper of an automobile is provided, such as Figure 6 As shown, the following steps are included:

[0045] Get the current speed of the car in real time and determine whether the speed is greater than 80kph;

[0046] If so, the air is inflated by an air pump until the pressure in the first airbag and the second airbag reaches 0.3 bar, so that the first airbag and the second airbag extend from the bumper of the car to produce a spoiler effect;

[0047] If not, air is pumped out through an air pump until the pressure in the first airbag and the second airbag is negative, so that the rear spoiler cover is flush with the surface of the vehicle body.

[0048] Furthermore, the controller controls the air pump according to the acquired vehicle speed information and airbag pressure information, so that the first airbag and the second airbag are within a set air pressure range.

[0049] Specifically, when the vehicle speed is lower than 80 kph, in order to reduce the air resistance at the rear of the vehicle during driving, the controller will issue a pumping command and the air pump will start pumping. When the pumping pressure reaches -0.05 bar (negative pressure), the airbag is already in a contracted pumping state, at which time the air pump 3 stops working, and the controller controls the solenoid valve to close to maintain the existing pressure of the airbag.

[0050] When the airbag is in the deflated state, the outer spoiler cover of the rear bumper shrinks naturally, and the rear bumper spoiler device body is hidden on the inner side of the rear bumper.

[0051] When the vehicle speed is higher than 80kph, it can be considered that the vehicle is currently in a driving state with good road conditions, and the air resistance begins to increase. The spoiler effect can increase the downforce of the vehicle and reduce the driving air resistance. At this time, the device is turned on, the controller issues an inflation command, and the air pump starts to inflate. When the inflation pressure reaches 0.3bar (positive pressure), the airbag is already in an inflated state. At this time, the air pump 3 stops working, and the built-in valve of the control unit 4 is closed to maintain the current pressure of the airbag.

[0052] When the airbag is in the inflated state, the airbag is in the extended state, and the rear spoiler cover begins to pop out, generating a spoiler effect, reducing the front and rear pressure difference of the vehicle and the resistance of the entire vehicle, thereby achieving aerodynamic drag reduction and reducing the overall fuel consumption of the vehicle.

[0053] Whether the airbag is inflated or deflated, the pressure sensor continues to monitor the pressure in the airbag and trachea. If the pressure changes rapidly, it means that there is a leak in the airbag or the pipeline, and an alarm or prompt can be issued to facilitate maintenance by the owner.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An active spoiler device for a rear bumper of an automobile, characterized in that: The invention comprises a first airbag and a second airbag, wherein the first airbag and the second airbag are respectively installed at two ends of the rear bumper of the automobile through a first airbag base and a second airbag base, wherein the first airbag base and the second airbag base are connected to an air pump through an air pipe, and the air pump inflates and exhausts the first airbag and the second airbag to change the state of the airbag extending from the rear bumper. A rear outer spoiler cover is provided on the outer end surfaces of the first airbag and the second airbag, and in the exhausted state, the rear outer spoiler cover is flush with the surface of the vehicle body.

2. The active spoiler device for a rear bumper of an automobile according to claim 1, characterized in that: The air pump is electrically connected to the controller, and the air pipes connected to the first airbag and the second airbag are both provided with a pressure sensor and a solenoid valve, and the pressure sensor and the solenoid valve are both electrically connected to the controller.

3. The active spoiler device for a rear bumper of an automobile as claimed in claim 2, characterized in that: The controller is connected to the vehicle ECU, and the vehicle ECU acquires vehicle speed information in real time and transmits the vehicle speed information to the controller.

4. The active spoiler device for a rear bumper of an automobile as claimed in claim 1, characterized in that: The airbag base is made of polypropylene material, the airbag is fixed on the airbag base by adhesive, a through hole is arranged on the airbag base, and the air inlet of the airbag is connected with the trachea through the through hole.

5. The active spoiler device for a rear bumper of an automobile as claimed in claim 4, characterized in that: The airbag is made of rubber material and is a retractable rectangular parallelepiped structure.

6. The active spoiler device for a rear bumper of an automobile as claimed in claim 1, characterized in that: A through hole is arranged at the position where the airbag is installed in the rear bumper, and the shape of the through hole matches the shape of the rear outer spoiler cover. The side of the rear outer spoiler cover close to the front of the car is hingedly connected to the rear bumper, so that the airbag extends out of the car bumper in a triangular shape after being inflated.

7. The active spoiler device for a rear bumper of an automobile as claimed in claim 1, characterized in that: The air pump is provided with a first air port and a second air port, the first air port is connected to the air pipe, the second air port is connected to the outside air, and the second air port is filled with a sponge.

8. The active spoiler device for a rear bumper of an automobile as claimed in claim 1, characterized in that: The outer end surface of the airbag is fixed to the rear outer spoiler cover by gluing.

9. A method for operating an active spoiler device for a rear bumper of an automobile according to any one of claims 1 to 8, characterized in that: The following steps are involved: Get the current speed of the car in real time and determine whether the speed is greater than 80kph; If so, the air is inflated by an air pump until the pressure in the first airbag and the second airbag reaches 0.3 bar, so that the first airbag and the second airbag extend from the bumper of the car to produce a spoiler effect; If not, air is pumped out through an air pump until the pressure in the first airbag and the second airbag is negative, so that the rear spoiler cover is flush with the surface of the vehicle body.

10. The working method of the active spoiler device for the rear bumper of an automobile as claimed in claim 9, characterized in that: The controller controls the air pump according to the acquired vehicle speed information and the airbag pressure information, so that the first airbag and the second airbag are within a set air pressure range.

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