Jet-propelled automobile rear wheel apron board and method

Abstract

The invention relates to the technical field of automobile resistance reduction, in particular to a jet-propelled automobile rear wheel apron board and a method, the jet-propelled automobile rear wheel apron board comprises a jet module and a control module, the jet module comprises a nozzle and a corresponding control valve, the nozzle is arranged on the outer side of an automobile body above a rear tire, and the jet direction of an air outlet of the nozzle is vertically downward; the air injection control module comprises a total pressure sensor installed on the lower edge of a rear vehicle window, and the total pressure sensor monitors the total pressure condition of the rear wall face of the vehicle tail; the pressurization gas storage module comprises a gas storage tank used for storing pressure gas, and the gas storage tank is connected with the nozzle through the control valve; the global control module is used for collecting and processing data of the total pressure sensor, and controlling on-off of the control valve so as to control on-off of the gas storage tank and the nozzle; tiny airflow is jetted on the outer side of the vehicle body above the rear tire through the arranged nozzle, a pneumatic molded surface of the choke plate is formed, pneumatic resistance generated when wheel arch turbulence impacts the vehicle side airflow can be reduced, and the heat dissipation performance of the vehicle tire can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile drag reduction, and in particular to a jet-type automobile rear wheel skirt and a method thereof. Background Art

[0002] With the popularization of new energy vehicles, not only has the new energy battery industry developed, but the body drag reduction and optimization technology has also once again received widespread attention.

[0003] In the existing drag reduction optimization technology, skirts are usually used for drag reduction design, such as Honda Insigne and GM EV1. This structure can reduce the impact of wheel arch turbulence on the airflow on the side of the car. However, since this technology covers most of the tire, it is not easy to remove and repair the tire, which causes inconvenience to the vehicle maintenance and has a negative impact on the heat dissipation performance of the wheel and brake pad. Summary of the invention

[0004] The purpose of the present invention is to provide a jet-type automobile rear wheel skirt, which can spray a tiny airflow on the outer side of the vehicle body above the rear tire through a nozzle to form an aerodynamic surface of the wind-blocking plate, which can not only reduce the aerodynamic resistance caused by the wheel arch turbulence hitting the airflow on the side of the vehicle, but also improve the heat dissipation performance of the vehicle tire. In order to achieve the above purpose, the present invention solves it through the following technical solutions:

[0005] In a first aspect, the present invention provides a jet-type automobile rear wheel skirt, comprising:

[0006] An air jet module, comprising a nozzle and a corresponding control valve, wherein the nozzle is arranged on the outside of the vehicle body above the rear tire and the air jet direction of the air outlet is vertically downward;

[0007] The jet control module includes a total pressure sensor mounted at the lower edge of the rear window, the total pressure sensor monitoring the total pressure condition of the rear wall of the rear end of the vehicle;

[0008] A pressurized gas storage module, comprising a gas storage tank for storing pressurized gas, wherein the gas storage tank is connected to the nozzle via the control valve;

[0009] The global control module is used to collect and process the data of the total pressure sensor, and control the on-off of the gas storage tank and the nozzle by controlling the on-off of the control valve.

[0010] As a further technical solution, the global control module includes a signal acquisition device, a processor and a signal output device. The signal acquisition device acquires data from the total pressure sensor and transmits it to the processor for processing, and outputs a control signal through the signal output device.

[0011] As a further technical solution, the global control module is connected to the pressurized gas storage module to control the pressure in the gas storage tank.

[0012] As a further technical solution, the gas storage tank is equipped with an air pump, and a total pressure sensor for monitoring the pressure inside the tank is provided in the gas storage tank; the total pressure sensor is connected to the signal acquisition device, and the air pump is connected to the signal output device to form a pressure regulation closed loop.

[0013] As a further technical solution, the opening of the control valve can be infinitely adjusted.

[0014] As a further technical solution, the length of the nozzle is equal to the diameter of the rear tire, and the nozzle outlet surface is flush with the lower edge of the rear fender of the vehicle body.

[0015] In a second aspect, the present invention provides a working method of the jet-type automobile rear wheel skirt according to the first aspect, comprising the following steps:

[0016] The global control module collects and processes the total pressure sensor data. When the total pressure of the rear wall of the vehicle meets the conditions, the boost gas storage module is activated. When the pressure in the gas tank reaches the set value, the control valve in the jet module is activated, the gas tank is connected to the nozzle, and the nozzle starts working.

[0017] As a further technical solution, when the total pressure of the rear wall of the vehicle is monitored to be below -50Pa, the pressurized air storage module is activated.

[0018] As a further technical solution, if the total pressure of the gas tank is monitored to be higher than 1.9 bar, the control valve is directly activated; if the total pressure of the gas tank is monitored to be between 1.5 and 1.9 bar, the air pump is started while the control valve is activated to make the total pressure of the gas tank reach 1.9 bar; if the total pressure is monitored to be lower than 1.5 bar, the air pump is started to make the total pressure of the gas tank reach 1.5 bar, and the output signal activates the control valve. At this time, the air pump continues to work until the total pressure of the gas tank reaches 1.9 bar.

[0019] As a further technical solution, the total pressure sensor signal of the rear wall of the vehicle is received in real time through the global control module, and the opening of the control valve is adjusted in real time to ensure that the air flow velocity at the nozzle outlet is stable at the set value.

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

[0021] 1. The nozzle provided in the present invention sprays a tiny airflow on the outer side of the vehicle body above the rear tire to form an aerodynamic surface of the wind deflector, which can not only reduce the aerodynamic resistance caused by the wheel arch turbulence hitting the airflow on the side of the vehicle, but also improve the heat dissipation performance of the vehicle tire.

[0022] 2. Considering that reducing the driving resistance of the vehicle is currently an important means to further improve the cruising range of electric vehicles, the previous automobile skirt structure not only has an adverse effect on the tire removal and heat dissipation of the vehicle, but also increases the wind resistance of the vehicle at a low speed. Under different rear wall negative pressure conditions, the present invention can adaptively adjust different airflow injection speeds to form different skirt aerodynamic surfaces, thereby achieving the optimal drag reduction effect of the tire skirt under different resistance conditions, and further reducing the tire aerodynamic resistance of the vehicle at different speeds.

[0023] 3. After the module of the present invention is turned on, the signal acquisition device further receives the signal of the total pressure sensor in the tank and transmits it to the processor. If the total pressure in the tank is lower than the set value, the output signal turns on the air pump, and the high-pressure gas enters the gas storage tank through the first gas pipe; when the total pressure in the gas storage tank reaches the set value, the control valve of the jet module of the pneumatic skirt is activated, and the signal of the total pressure sensor on the rear wall of the vehicle tail of the jet control module is monitored to adjust the opening of the control valve in real time to ensure that the air flow velocity at the nozzle outlet is at the set value under the resistance condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute a limitation of the present invention. It should also be understood that these drawings are shown for simplicity and clarity and are not necessarily drawn to scale. The present invention will now be described and explained with additional features and details through the use of the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of the structure of the rear wheel skirt of a jet-type automobile in an embodiment of the present invention is shown;

[0026] Figure 2 A schematic diagram showing the installation position of the rear wheel skirt of a jet-type automobile in an embodiment of the present invention is shown;

[0027] Figure 3 A logical schematic diagram of a global control module of a jet-type automobile rear wheel skirt in an embodiment of the present invention is shown.

[0028] In the figure: 1. signal acquisition device; 2. total pressure sensor; 3. processor; 4. signal output device; 5. total pressure sensor in the tank; 6. control valve; 7. air pump; 8. first gas pipeline; 9. gas storage tank; 10. nozzle; 11. second gas pipeline. DETAILED DESCRIPTION

[0029] The technical solutions in typical embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] Embodiment 1

[0031] like Figure 1 and Figure 2 As shown, this embodiment provides a jet-type automobile rear wheel skirt, including a jet module, a jet control module, a pressurized air storage module and a global control module.

[0032] The jet module includes a nozzle 10 and a corresponding control valve 6. The nozzle 10 is arranged on the outside of the vehicle body above the rear tire. Since there are two rear wheels, two nozzles 10 need to be configured, which are respectively configured on the outside of the vehicle body above the two rear tires. In this embodiment, the nozzle 10 adopts a slit nozzle. The inlet and outlet area ratio of the slit nozzle is 4, that is, the ratio of the outlet area of ​​the slit nozzle to the cross-sectional area of ​​the air supply pipe is 4; the nozzle width, that is, the gap width of the slit is 10mm, and the length is equal to the diameter of the rear tire. The nozzle outlet surface is flush with the lower edge of the rear fender to achieve the purpose of hidden installation. The nozzle outlet surface is flush with the outer edge of the wheel arch, and the jet direction is vertically downward to form an air curtain.

[0033] The nozzle 10 provided in this embodiment sprays a tiny airflow on the outer side of the vehicle body above the rear tire to form an aerodynamic surface of the wind deflector, which can not only reduce the aerodynamic resistance caused by the wheel arch turbulence hitting the airflow on the side of the vehicle, but also improve the heat dissipation performance of the vehicle tire.

[0034] The nozzle 10 is provided with a control valve 6, which is arranged between the nozzle 10 and the pressurized gas storage module. The opening of the control valve 6 can be infinitely adjusted to ensure that the nozzle 10 generates a jet of a specified speed.

[0035] The jet control module includes a total pressure sensor 2 installed at the lower edge of the rear window. The total pressure sensor 2 monitors the total pressure condition of the rear wall of the vehicle. In this embodiment, the total pressure sensor 2 is in the shape of a flat strip. The negative pressure at the rear wall of the vehicle changes significantly with the vehicle speed, which can well reflect the resistance conditions at different vehicle speeds. The total pressure sensor 2 is used to monitor the total pressure condition of the rear wall of the vehicle. As the vehicle body resistance increases, the total pressure monitored by the total pressure sensor 2 will decrease, and the data will be transmitted to the global control module to adjust the opening of the control valve in the jet module to increase the jet speed.

[0036] The pressurized gas storage module is composed of an air pump 7, a first gas pipeline 8, a gas tank 9 and a total pressure sensor 5 in the tank. The gas tank 9 is used to store pressurized gas, and the gas tank 9 is connected to the nozzle 10 through a control valve 6. In this embodiment, the air pump 7 is used to provide a high-pressure gas source, with a maximum pressure increase ratio of 2, low energy consumption, and little impact on the vehicle's cruising range; the first gas pipeline 8 is used to connect the air pump 7 and the gas tank 9; the volume of the gas tank 9 is 3L, and the total pressure sensor 5 in the tank is located inside the gas tank 9 to monitor the total pressure of the gas in the tank in real time.

[0037] The gas storage tank 9 is connected to the nozzle 10 via a second gas delivery pipe 11, and the control valve 6 is installed in the middle of the second gas delivery pipe 11. The first gas delivery pipe 8 and the second gas delivery pipe 11 are both gas delivery hoses.

[0038] The global control module is used to collect and process the data of the total pressure sensor 2, and to control the on-off of the gas storage tank 9 and the nozzle 10 by controlling the on-off of the control valve 6.

[0039] The global control module includes a signal acquisition device 1, a processor 3 and a signal output device 4. The signal acquisition device 1 collects data from the total pressure sensor 2 and transmits it to the processor 3 for processing. The instructions issued by the processor 3 output control signals to each component through the signal output device 4.

[0040] The global control module is connected to the pressurized gas storage module to control the pressure in the gas storage tank 9, the total pressure sensor 5 in the tank is connected to the signal acquisition device 1, and the air pump 7 is connected to the signal output device 4 to form a pressure regulation closed loop.

[0041] In order to enhance the safety performance of the device, when the total pressure in the gas tank 9 reaches 1.9 bar, the air pump 7 stops working; when the total pressure in the gas tank 9 is lower than 1.5 bar, the air pump 7 is activated again.

[0042] Before the device is started, the total pressure sensor 2 works in real time, and the signal acquisition device 1 only receives the pressure signal of the total pressure sensor 2 on the rear wall of the vehicle and transmits it to the processor 3. When the total pressure on the rear wall of the vehicle is above -50Pa, the core components of the jet rear wheel skirt do not work, and only the signal acquisition device 1 of the global control module collects the signal of the rear wall total pressure sensor 2 in real time and transmits it to the processor 3, but the signal output device 4 has no output signal. If the total pressure is less than -50Pa, the output signal activates the jet module and the supercharged air storage module; when the total pressure on the rear wall of the vehicle is restored to above -50Pa, the processor 3 sends a signal to stop the jet module and the supercharged air storage module.

[0043] After the module is turned on, the signal acquisition device 1 further receives the signal of the total pressure sensor 5 in the tank and transmits it to the processor 3. If the total pressure in the tank is lower than 1.5 bar, the output signal turns on the air pump 7, and the high-pressure gas enters the gas storage tank 9 through the first gas pipe 8; when the total pressure in the gas storage tank 9 reaches 1.5 bar, the control valve 6 of the jet module of the pneumatic skirt is activated, and the signal of the total pressure sensor 2 on the rear wall of the vehicle tail of the jet control module is monitored, and the opening of the control valve 6 is adjusted in real time to ensure that the air flow velocity at the nozzle 10 outlet is at the set value under the resistance condition.

[0044] Embodiment 2

[0045] This embodiment provides a working method of the jet-type automobile rear wheel skirt according to the first embodiment, such as Figure 3 As shown, the following steps are included:

[0046] The global control module collects and processes the data from the total pressure sensor 2. When the collected total pressure of the rear wall of the vehicle meets the conditions, that is, the total pressure of the rear wall of the vehicle is less than -50Pa, the output signal activates the injection module and the boost gas storage module.

[0047] The pressurized gas storage module is activated. When the pressure in the gas storage tank 9 reaches the set value, the control valve 6 in the jet module is activated, the gas storage tank 9 is connected to the nozzle 10, and the nozzle 10 starts to work.

[0048] If the signal acquisition device 1 detects that the total pressure of the gas tank 9 is higher than 1.9 bar, the processor 3 outputs a signal to directly activate the control valve 6; if it detects that the total pressure of the gas tank 9 is between 1.5 and 1.9 bar, the processor 3 outputs a signal to activate the control valve 6 and start the air pump 7 at the same time, so that the total pressure of the gas tank 9 reaches 1.9 bar; if the total pressure is detected to be lower than 1.5 bar, the processor 3 outputs a signal to start the air pump 7 so that the total pressure of the gas tank 9 reaches 1.5 bar, and the output signal activates the control valve 6. At this time, the air pump 7 continues to work until the total pressure of the gas tank 9 reaches 1.9 bar.

[0049] The total pressure sensor 2 signal of the rear wall of the vehicle tail is received in real time through the global control module, and the opening of the control valve 6 is adjusted in real time to ensure that the air flow velocity at the nozzle 10 outlet is stable at the set value.

[0050] Considering that reducing the driving resistance of the vehicle is currently an important means to further improve the range of electric vehicles, the previous car skirt structure not only has an adverse effect on the tire removal and heat dissipation of the car, but also increases the wind resistance of the whole vehicle at low speeds. Under different rear wall negative pressure conditions, different airflow injection speeds can be adaptively controlled to form different skirt aerodynamic surfaces, so that the optimal drag reduction effect of the tire skirt can be achieved under different resistance conditions.

[0051] Under different conditions of total pressure on the rear wall of the vehicle, the setting value of the nozzle 10 outlet velocity is different; a large number of numerical simulations show that when the jet velocity is approximately the driving speed, the drag reduction efficiency is the highest; however, too high a jet velocity means a greater energy consumption, so the jet velocity is set to 90% of the driving speed in this embodiment. The vehicle speed is not monitored in this embodiment, but the vehicle speed is closely related to the total pressure of the rear wall, and the jet velocity can be matched according to different total pressure values.

[0052] In order to ensure a high jet drag reduction efficiency, when the total pressure reaches -50Pa, the jet speed is set to 12m / s; the signal from the rear wall total pressure sensor 2 is received in real time through the signal acquisition device 1, and the opening of the control valve 6 is adjusted in real time to ensure that the nozzle outlet air flow speed is stable at 12m / s.

[0053] As the total pressure on the rear wall of the vehicle gradually decreases to -80Pa, -110Pa and -140Pa, the corresponding air flow velocity at the nozzle 10 outlet is stabilized at 18m / s, 24m / s and 30m / s. It has been verified that when the vehicle travels at a speed of 60 to 120km / h, the drag coefficient can be reduced by about 2 to 4%.

[0054] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A jet-type automobile rear wheel skirt, characterized in that: include: An air jet module, comprising a nozzle and a corresponding control valve, wherein the nozzle is arranged on the outside of the vehicle body above the rear tire and the air jet direction of the air outlet is vertically downward; The jet control module includes a total pressure sensor mounted at the lower edge of the rear window, the total pressure sensor monitoring the total pressure condition of the rear wall of the rear end of the vehicle; A pressurized gas storage module, comprising a gas storage tank for storing pressurized gas, wherein the gas storage tank is connected to the nozzle via the control valve; The global control module is used to collect and process the data of the total pressure sensor, and control the on-off of the gas storage tank and the nozzle by controlling the on-off of the control valve.

2. A jet-type automobile rear wheel skirt as claimed in claim 1, characterized in that: The global control module includes a signal acquisition device, a processor and a signal output device. The signal acquisition device acquires data from the total pressure sensor and transmits it to the processor for processing, and outputs a control signal through the signal output device.

3. A jet-type automobile rear wheel skirt as claimed in claim 2, characterized in that: The global control module is connected to the pressurized gas storage module to control the pressure in the gas storage tank.

4. A jet-type automobile rear wheel skirt as claimed in claim 3, characterized in that: The gas storage tank is equipped with an air pump, and a total pressure sensor for monitoring the pressure inside the tank is provided inside the gas storage tank; the total pressure sensor is connected to the signal acquisition device, and the air pump is connected to the signal output device to form a pressure regulation closed loop.

5. The jet-type automobile rear wheel skirt as claimed in claim 1, characterized in that: The opening degree of the control valve can be adjusted steplessly.

6. The jet-type automobile rear wheel skirt as claimed in claim 1, characterized in that: The length of the nozzle is equal to the diameter of the rear tire, and the nozzle outlet surface is flush with the lower edge of the rear fender of the vehicle body.

7. The working method of the jet-type automobile rear wheel skirt according to any one of claims 1 to 6, characterized in that: The following steps are involved: The global control module collects and processes the total pressure sensor data. When the total pressure of the rear wall of the vehicle meets the conditions, the boost gas storage module is activated. When the pressure in the gas tank reaches the set value, the control valve in the jet module is activated, the gas tank is connected to the nozzle, and the nozzle starts working.

8. The method for operating the jet-type automobile rear wheel skirt according to any one of claims 1 to 6 as claimed in claim 7, characterized in that: When the total pressure of the rear wall of the vehicle is detected to be below -50Pa, the boost gas storage module is activated.

9. The working method of the jet car rear wheel skirt according to any one of claims 1 to 6 as described in claim 7, if the total pressure of the gas tank is monitored to be higher than 1.9 bar, the control valve is directly activated; if the total pressure of the gas tank is monitored to be between 1.5 and 1.9 bar, the air pump is activated while the control valve is activated to make the total pressure of the gas tank reach 1.9 bar; if the total pressure is monitored to be lower than 1.5 bar, the air pump is turned on to make the total pressure of the gas tank reach 1.5 bar, and the control valve is activated by outputting a signal, and the air pump continues to work until the total pressure of the gas tank reaches 1.9 bar.

10. The working method of the jet-type automobile rear wheel skirt according to any one of claims 1 to 6 as described in claim 7, wherein the total pressure sensor signal of the rear wall of the rear of the vehicle is received in real time by the global control module, and the opening of the control valve is adjusted in real time to ensure that the air flow velocity at the nozzle outlet is stable at the set value.

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