Active drag-reducing sharklet antenna, method and car

Abstract

The application discloses an active drag-reducing shark fin antenna, a method and a car, and belongs to the technical field of automobile drag reduction. The active drag-reducing shark fin antenna comprises a shark fin antenna, a pressurized gas storage module and a control module, a plurality of jet ports are formed in the top of the shark fin antenna, a jet module is arranged in the inside of the shark fin antenna, the jet ports are in communication with the jet module, a lifting module is arranged at the bottom of the shark fin antenna, the pressurized gas storage module is in communication with the jet module, the control module is used for acquiring a vehicle speed signal, and the running states of the jet module, the lifting module and the pressurized gas storage module are controlled according to the vehicle speed signal. The height of the shark fin antenna on the top of the car and the jet speed can be actively regulated according to the change of the driving speed, the aerodynamic drag of the whole vehicle is reduced, the purpose of reducing energy consumption is achieved, and the problem that the wind resistance of the existing vehicle is difficult to reduce is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile drag reduction technology, in particular to an active drag reduction shark fin antenna, method and automobile. BACKGROUND

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

[0003] The cruising range per unit energy consumption is one of the most important indicators for evaluating the performance of automobiles (including traditional fuel automobiles and new energy electric automobiles), but at the present stage, the engine thermal efficiency of traditional fuel automobiles and the battery capacity of new energy electric automobiles are difficult to make major breakthroughs in a short time. Therefore, reducing the driving resistance of automobiles is an important means to further improve the cruising range of automobiles at present, and automobile drag reduction technology has become the focus of more and more people.

[0004] The current automobile drag reduction method mainly optimizes the aerodynamic shape of the automobile or adds passive drag reduction devices such as wind deflectors, spoilers and diffusers, which is difficult to further reduce the wind resistance coefficient and cannot actively control the flow field around the automobile. SUMMARY

[0005] In order to solve the problems of the prior art, the present application provides an active drag reduction shark fin antenna, method and automobile, which changes the height of the shark fin antenna according to the driving speed of the automobile and sprays a small air flow around the top of the shark fin antenna, so as to actively control the flow field around the automobile and achieve the purpose of reducing the wind resistance of the vehicle.

[0006] In a first aspect, the present application provides an active drag reduction shark fin antenna;

[0007] An active drag reduction shark fin antenna comprises:

[0008] A shark fin antenna, a plurality of air injection ports are formed in the top of the shark fin antenna, a gas injection module is arranged in the interior of the shark fin antenna, and the air injection ports are in communication with the gas injection module; a lifting module is arranged at the bottom of the shark fin antenna;

[0009] A pressurized gas storage module in communication with the gas injection module;

[0010] A control module for acquiring a vehicle speed signal and controlling the operating state of the gas injection module, the lifting module and the pressurized gas storage module according to the vehicle speed signal.

[0011] In some embodiments, the control of the operating state of the gas injection module, the lifting module and the pressurized gas storage module according to the vehicle speed signal comprises:

[0012] If the vehicle speed signal exceeds a preset vehicle speed threshold, the control module activates the lifting module and the pressurized gas storage module;

[0013] The total pressure signal of the gas storage tank in the pressurized gas storage module is acquired, if the total pressure signal exceeds a preset first total pressure threshold, the control module activates the control valve in the gas jetting module, if the total pressure signal is within a preset total pressure threshold range, the control module activates the control valve and the gas pump in the pressurized gas storage module, if the total pressure signal is lower than a preset second total pressure threshold, the control module starts the gas pump.

[0014] In some embodiments, the lifting module comprises a lifting mechanism and a support rod, the support rod is arranged at the bottom of the shark fin antenna, and the lifting mechanism is arranged at the bottom of the support rod.

[0015] In some embodiments, the pressurized gas storage module comprises a gas pump and a gas storage tank, the gas pump is in communication with the input end of the gas storage tank, and the output end of the gas storage tank is in communication with the gas jetting module.

[0016] A total pressure sensor is arranged in the gas storage tank, the total pressure sensor is used to acquire the total pressure of the gas in the gas storage tank, and the control module is used to control the gas pump and the gas jetting module according to the total pressure of the gas.

[0017] In some embodiments, the gas jetting module comprises a gas conveying pipe, a control valve, a gas pressure sensor and a static pressure sensor, the control valve is arranged in the gas conveying pipe, one end of the gas conveying pipe is arranged below the gas jetting port, and the other end of the gas conveying pipe is in communication with the pressurized gas storage module.

[0018] The gas pressure sensor is arranged behind the control valve, and the static pressure sensor is arranged behind the shark fin antenna.

[0019] In some embodiments, the gas pressure sensor is used to acquire the total gas pressure behind the control valve, the static pressure sensor is used to acquire the static pressure of the airflow at the end of the roof, and the control module is used to adjust the opening degree of the control valve in real time according to the total gas pressure behind the control valve and the static pressure of the airflow at the end of the roof.

[0020] In some embodiments, one end of the gas conveying pipe is in communication with a plurality of groups of gas conveying pipe jetting ports, and the gas conveying pipe jetting ports are located below the gas jetting port.

[0021] In some embodiments, the lifting height of the lifting module is proportional to the vehicle speed signal.

[0022] In the second aspect, the application provides an active drag-reducing shark fin antenna control method.

[0023] An active drag reduction shark fin antenna control method based on the active drag reduction shark fin antenna, comprising the following steps:

[0024] A vehicle speed signal is acquired, and if the vehicle speed signal exceeds a preset vehicle speed threshold, the lifting module and the pressurized gas storage module are activated.

[0025] A total pressure signal of a gas storage tank in the pressurized gas storage module is acquired, if the total pressure signal exceeds a preset first total pressure threshold, a control valve in the gas injection module is activated, if the total pressure range is within a preset total pressure threshold range, the control module activates the control valve and a gas pump in the pressurized gas storage module, and if the total pressure range is lower than a preset second total pressure threshold, the gas pump is started.

[0026] In a third aspect, the application provides an automobile.

[0027] An automobile comprises the active shark fin antenna.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] 1. The technical scheme provided by the application can change the height of the shark fin antenna according to the driving speed of the automobile, and can use the injection of a small air flow around the top of the shark fin antenna to adaptively and actively control the flow field around the automobile, reduce the strength of the vortex, delay the air flow separation, increase the static pressure recovery of the tail, and realize further significant reduction of the aerodynamic drag of the vehicle in different speed ranges.

[0030] 2. The technical scheme provided by the application sets the injection speed according to the driving speed of the vehicle, thereby reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings accompanying the specification of the application form part of the application and serve to provide further understanding of the application, the illustrative embodiments of the application and their description serve to explain the application, and do not constitute an improper limitation of the application.

[0032] Fig. 1 The accompanying drawings provide a schematic diagram of the composition architecture of the active drag reduction shark fin antenna provided by the embodiments of the application.

[0033] Fig. 2 The accompanying drawings provide a schematic diagram of the composition architecture of the active drag reduction shark fin antenna provided by the embodiments of the application.

[0034] Fig. 3 The accompanying drawings provide a schematic diagram of the composition architecture of the active drag reduction shark fin antenna provided by the embodiments of the application.

[0035] In the figure: 1, signal acquisition device; 2, vehicle speed sensor; 3, signal processing device; 4, signal output device; 5, gas storage tank; 6, control valve; 7, gas pump; 8, gas conveying hose; 9, gas injection port; 10, gas conveying pipe injection port; 11, gas conveying pipe; 12, total pressure sensor; 13, static pressure sensor. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise defined, 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 application belongs.

[0037] In the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other.

[0038] Embodiment one

[0039] The existing vehicle drag reduction methods are mostly passive drag reduction. Some passive drag reduction methods may not have drag reduction effect and increase drag at low speed driving. Therefore, the application provides an active drag reduction shark fin antenna.

[0040] Next, combined with Figs. 1-3 , a kind of active drag reduction shark fin antenna disclosed in the embodiment is described in detail.

[0041] The active drag reduction shark fin antenna includes a shark fin antenna, a pressurized gas storage module and a control module. The top of the shark fin antenna is symmetrically provided with two groups of gas injection ports 9, and each group of gas injection ports 9 has three gas injection ports. A gas injection module is installed inside the shark fin antenna, which is located below the gas injection port 9. The gas injection port 9 is in communication with the gas injection module, and the gas injection module can inject a small gas flow upward through the gas injection port 9. A lifting module is installed at the bottom of the shark fin antenna, which can control the height adjustment of the shark fin antenna within a lifting range. The pressurized gas storage module is in communication with the gas injection module, which is used to provide gas source for the gas injection module. The control module is in communication connection with the lifting module, the pressurized gas storage module and the gas injection module. The control module acquires vehicle speed signal and controls the operating state of the gas injection module, the lifting module and the pressurized gas storage module according to the vehicle speed signal, and then performs self-adaptive active drag reduction according to the vehicle speed.

[0042] As an embodiment, the lifting module includes a lifting mechanism and a support rod. The top of the support rod is connected with the bottom surface of the shark fin antenna, and the bottom of the support rod is connected with the lifting mechanism. The inside of the support rod is hollow, which can be used as the installation space of other components, such as the gas injection hose in the gas injection module, to realize the reduction of the overall volume of the active drag reduction shark fin antenna. A signal enhancement device is installed in the shark fin antenna. This is the prior art in the field and is not improved in this embodiment, so it will not be described here.

[0043] Here, the lifting mechanism is a scissor lifting structure to provide stable height adjustment for the shark fin antenna.

[0044] The pressurized gas storage module includes the gas pump 7 and the gas storage tank 5, the jet module includes the gas delivery pipe 11, the control valve 6, the gas pressure sensor and the static pressure sensor 13, the gas pump 7 is communicated with the input end of the gas storage tank 5 through the gas delivery hose 8, the output end of the gas storage tank 5 is communicated with one end of the gas delivery pipe 11, the other end of the gas delivery pipe 11 is communicated with two groups of gas delivery pipe nozzles 10, one group of the gas delivery pipe nozzles 10 is three in number and is located below the corresponding jet port 9; the control valve 6 is installed in the middle of the gas delivery pipe 11.

[0045] The gas pump 7 and the gas storage tank 5 are installed below the rear seat of the car and are communicated with the gas delivery pipe 11; here, the length of the gas delivery pipe 11 can be set according to actual needs, so the installation position of the gas pump 7 and the gas storage tank 5 is not unique.

[0046] In this embodiment, the gas pump 7 is used to provide a high-pressure gas source, the maximum pressurization ratio is 2, the energy consumption is low, and the impact on the vehicle's range is very small; the volume of the gas storage tank 5 is 5L.

[0047] The total pressure sensor 12 is installed in the gas storage tank 5, which is used to collect the total pressure of the gas in the gas storage tank 5 and transmit it to the control module; the gas pressure sensor is installed inside the gas delivery pipe 11 and is located behind the control valve 6 along the direction of the gas flow, which is used to collect the total gas pressure behind the control valve 6 and transmit it to the control module; the static pressure sensor 13 is installed behind the shark fin antenna, which is used to collect the static pressure of the airflow at the end of the roof and transmit it to the control module; the control module is used to control the gas pump 7 and the control valve 6 according to the total gas pressure, the total gas pressure behind the control valve 6 and the static pressure of the airflow at the end of the roof.

[0048] The working mode of the active drag-reducing shark fin antenna described in this embodiment is as follows:

[0049] In the initial state, the active drag-reducing shark fin antenna is not started, the control module receives the vehicle speed signal collected by the vehicle speed sensor 2 in real time, if the vehicle speed signal is within the preset first vehicle speed threshold range, the active drag-reducing shark fin antenna does not start to reduce the drag, here, the first vehicle speed threshold range is 0-59km / h.

[0050] If the vehicle speed signal exceeds the preset vehicle speed threshold, the control module outputs a signal to activate the pressurized gas storage module and the lifting mechanism, and the lifting mechanism drives the shark fin antenna to rise one centimeter. Here, the vehicle speed threshold is 60km / h.

[0051] The control module further receives the total pressure signal collected by the total pressure sensor 12, and if the total pressure signal is higher than the preset first total pressure threshold, the control module outputs a signal to start the control valve 6, and a small air flow is ejected outward through the gas delivery pipe spout 10 and the air jet 9. Here, the first total pressure threshold is 1.9 bar. If the total pressure signal is within the preset total pressure threshold range, the output signal starts the control valve 6 and the air pump 7, and high-pressure gas enters the gas tank 5 through the gas delivery pipe 11 until the total pressure reaches 1.9 bar, and the air pump 7 stops working. Here, the total pressure threshold range is 1.5 bar-1.9 bar. If the total pressure signal is lower than the preset second total pressure threshold of 1.5 bar, the control module outputs a signal to start the air pump 7, and high-pressure gas enters the gas tank 5 through the gas delivery pipe 11 until the total pressure 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 5 reaches 1.9 bar.

[0052] Wherein, after the control valve 6 is started, the gas tank 5 is in communication with the air jet 9, and the air jet 9 starts to work. In order to ensure a high air jet drag reduction efficiency, the air jet speed is set to 90% of the driving speed, i.e. 15 m / s. At this time, the ratio of the total pressure after the valve to the static pressure behind the shark fin should be maintained at 1.002. Specifically, the signals of the total pressure sensor 12 and the static pressure sensor 13 are received in real time, and the opening of the control valve 6 is adjusted in real time to ensure that the ratio of the total pressure after the valve to the static pressure behind the shark fin is 1.002, so that the air flow speed at the nozzle outlet is stabilized at 15 m / s.

[0053] As the vehicle speed gradually increases to 70 km / h, 90 km / h, 100 km / h, 110 km / h and 120 km / h, the corresponding lifting height of the lifting mechanism is increased to 1.5 cm, 2.5 cm, 3 cm, 3.5 cm and 4 cm, respectively. The ratio of the total pressure after the valve to the static pressure behind the shark fin should be maintained at 1.003, 1.004, 1.005, 1.006 and 1.007, respectively, and the air flow speed at the nozzle outlet is stabilized at 17.5 m / s, 22.5 m / s, 25 m / s, 27.5 m / s and 30 m / s, respectively. Through verification, when the vehicle driving speed is in the range of 70-120 km / h, the wind resistance coefficient can be reduced by about 4-6%.

[0054] That is, the vehicle speed is proportional to the lifting height of the lifting mechanism and the air flow speed at the nozzle outlet, so as to better disturb the flow around the car and thereby reduce the vehicle resistance.

[0055] The opening of the control valve 6 is adjusted accurately by monitoring the ratio of the total pressure in the tank and the static pressure behind the shark fin, so that the nozzle outlet can be fully expanded to the set speed to reduce energy consumption. The set value of the nozzle outlet speed is different at different driving speeds; a large number of numerical simulations show that the drag reduction efficiency is the highest when the jet speed is about the driving speed; however, too high jet speed means greater energy consumption, therefore, in the embodiment, the jet speed is set to 90% of the driving speed.

[0056] In the embodiment, the control module comprises a signal acquisition device 1, a signal processing device 3 and a signal output device 4, the signal acquisition device 1 is used to receive the signals sent by the sensors and transmit them to the signal processing device 3, and the instructions sent by the signal processing device 3 are transmitted to each component through the signal output device 4.

[0057] Here, the signal acquisition device 1 is a signal acquisition card, the signal processing device 3 is a processor, and the signal output device 4 is an output interface.

[0058] In summary, the technical scheme provided by the embodiment actively adjusts and controls the height of the shark fin antenna on the top of the vehicle and the jet speed according to the change of the driving speed by designing a jet channel in the shark fin antenna, further reduces the aerodynamic drag of the whole vehicle, and thus achieves the purpose of reducing energy consumption.

[0059] Embodiment Two

[0060] Based on the active drag reduction shark fin antenna described in Embodiment One, the embodiment discloses an active drag reduction shark fin antenna control method, which is applied to a control module and comprises the following steps:

[0061] S1, obtaining a vehicle speed signal, if the vehicle speed signal exceeds a preset vehicle speed threshold, activating a lifting module and a pressurized gas storage module.

[0062] Specifically, when the vehicle speed is in the range of 0-59km / h, the lifting module, the pressurized gas storage module and the jet module are all not working; after monitoring that the vehicle speed reaches 60km / h, the control module outputs a signal through the output interface to activate the scissor lifting mechanism of the lifting module and the pressurized gas storage module, and the scissor lifting mechanism drives the shark fin antenna to rise by 1cm.

[0063] Meanwhile, the control module acquires the total pressure signal of the gas storage tank 5 in the pressurized gas storage module through the signal acquisition card. If the total pressure signal exceeds the preset first total pressure threshold 1.9 bar, the control valve 6 in the air jet module is activated, and the airflow is output through the gas pipe jet 10 and the air jet hole to the surrounding area above the shark fin antenna, forming a small disturbance airflow. If the total pressure range is within the preset total pressure threshold range 1.5-1.9 bar, the control module outputs a signal through the output interface to activate the control valve 6 and the air pump 7 in the pressurized gas storage module. High-pressure gas is input into the gas storage tank 5 through the air pump 7 until the total pressure reaches 1.9 bar, and the air pump 7 stops working. If the total pressure range is lower than the preset second total pressure threshold 1.5 bar, the air pump 7 is immediately started by outputting a signal, and high-pressure gas is delivered to the gas storage tank 5 until the total pressure reaches 1.5 bar. Then, a signal is output to activate the control valve 6. At this time, the air pump 7 continues to work until the total pressure in the gas storage tank 5 reaches 1.9 bar.

[0064] In order to ensure high air jet drag reduction efficiency, the jet speed is set to 90% of the driving speed. The control module receives the signals collected by the total pressure sensor 12 and the static pressure sensor 13 through the signal acquisition card in real time, and adjusts the opening degree of the control valve 6 in real time.

[0065] For example, as the vehicle speed gradually increases to 70 km / h, 90 km / h, 100 km / h, 110 km / h and 120 km / h, the corresponding lifting height of the lifting module is increased to 1.5 cm, 2.5 cm, 3 cm, 3.5 cm and 4 cm respectively. The ratio of the total pressure after the valve to the static pressure behind the shark fin should be maintained at 1.003, 1.004, 1.005, 1.006 and 1.007 respectively, and the jet nozzle outlet airflow speed should be stabilized at 17.5 m / s, 22.5 m / s, 25 m / s, 27.5 m / s and 30 m / s respectively.

[0066] Example Three

[0067] Based on the active drag reduction shark fin antenna described in Example One, the present embodiment provides a car provided with the active drag reduction shark fin antenna described in the above examples. Since the active drag reduction shark fin antenna has the above technical effects, the technical effects of the car using the active drag reduction shark fin antenna are as described in the above examples.

[0068] Further, the active drag reduction shark fin antenna is installed on the roof of the car. If the car is a medium or large SUV, the static pressure sensor is installed 30 cm away from the back wall of the shark fin antenna. If the car is a small SUV, the static pressure sensor is installed 20 cm away from the back wall of the shark fin antenna. If the car is a sedan, the static pressure sensor is installed 3-5 cm away from the shark fin antenna, achieving the purpose of hidden installation.

[0069] The description of each of the above-mentioned embodiments has a focus on that embodiment. Parts that have not been described in detail for a certain embodiment can be gathered from the description of the other embodiments.

[0070] The above descriptions are merely some embodiments of the present application, not intended to limit the present application. According to the application, various modifications and variations can be made thereto by those skilled in the art without departing from the spirit and principles of the application. Any modifications, equivalent replacements, improvements, etc., made within the spirit and principles of the present application shall fall within the scope of the present application.

Claims

1. An active drag-reducing shark fin antenna, characterized in that, include: The shark fin antenna has multiple air jets at its top, an air jet module inside, and the air jets connected to the air jet module; a lifting module is located at the bottom of the shark fin antenna. A pressurized gas storage module, which is connected to the jet module; The control module is used to acquire vehicle speed signals and control the operating status of the jet module, the lifting module, and the pressurized air storage module based on the vehicle speed signals; including: If the vehicle speed signal exceeds the preset vehicle speed threshold, the control module activates the lifting module and the pressurized air storage module. The total pressure signal of the gas storage tank in the pressurized gas storage module is obtained. If the total pressure signal exceeds the preset first total pressure threshold, the control module activates the control valve in the jet module. If the total pressure signal is within the preset total pressure threshold range, the control module activates the control valve and the air pump in the pressurized gas storage module. If the total pressure signal is lower than the preset second total pressure threshold, the control module starts the air pump. The lifting height of the lifting module is proportional to the vehicle speed signal.

2. The active drag-reducing shark fin antenna as described in claim 1, characterized in that, The lifting module includes a lifting mechanism and a support rod. The support rod is located at the bottom of the shark fin antenna, and the lifting mechanism is located at the bottom of the support rod.

3. The active drag-reducing shark fin antenna as described in claim 1, characterized in that, The pressurized air storage module includes an air pump and an air storage tank. The air pump is connected to the input end of the air storage tank, and the output end of the air storage tank is connected to the jet module. The gas storage tank is equipped with a total pressure sensor, which is used to collect the total gas pressure in the gas storage tank. The control module is used to control the air pump and the jet module according to the total gas pressure.

4. The active drag-reducing shark fin antenna as described in claim 1, characterized in that, The jet module includes an air supply pipe, a control valve, a pressure sensor, and a static pressure sensor. The control valve is located on the air supply pipe. One end of the air supply pipe is located below the jet nozzle, and the other end of the air supply pipe is connected to the pressurized air storage module. The air pressure sensor is located behind the control valve, and the static pressure sensor is located behind the shark fin antenna.

5. The active drag-reducing shark fin antenna as described in claim 4, characterized in that, The air pressure sensor is used to collect the total air pressure after the control valve, the static pressure sensor is used to collect the static pressure of the airflow at the end of the roof, and the control module is used to adjust the opening of the control valve in real time according to the total air pressure after the control valve and the static pressure of the airflow at the end of the roof.

6. The active drag-reducing shark fin antenna as described in claim 4, characterized in that, One end of the gas supply pipe is connected to multiple sets of gas supply pipe nozzles, and the gas supply pipe nozzles are located below the gas jet nozzles.

7. A control method for an active drag-reducing shark fin antenna, based on the active drag-reducing shark fin antenna according to any one of claims 1-6, characterized in that, Includes the following steps: The vehicle speed signal is acquired. If the vehicle speed signal exceeds the preset vehicle speed threshold, the lifting module and the pressurized air storage module are activated. The total pressure signal of the gas storage tank in the pressurized gas storage module is obtained. If the total pressure signal exceeds the preset first total pressure threshold, the control valve in the jet module is activated. If the total pressure range is within the preset total pressure threshold range, the control module activates the control valve and the air pump in the pressurized gas storage module. If the total pressure range is lower than the preset second total pressure threshold, the air pump is started.

8. A car, characterized in that, Including the active drag-reducing shark fin antenna as described in any one of claims 1-6.

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