Device for enabling vehicle falling into water to float on water surface by utilizing buoyancy generated by inflation of air bag

Abstract

The invention relates to a device for enabling a drowning vehicle to float on the water surface by utilizing buoyancy generated by inflating an air bag. According to the technical field, the buoyancy principle is utilized, the automobile floating function is achieved, and the life of people in an automobile is protected. The technical problem to be solved is clearly reflected that the car quickly sinks into the water after falling into water, and the technology invented by our company can enable the car falling into water to float on the water surface for a long time, so that the life safety of people in the car is effectively protected. The technical scheme for solving the problem is characterized in that an air bag with proper specification is matched according to the self weight of a vehicle model. When the vehicle falls into deep water, the device automatically inflates the four air bags mounted in the front, rear, left and right directions below the chassis of the vehicle, buoyancy generated by inflation expansion of the air bags is transmitted to the vehicle, and the buoyancy enables the vehicle falling into water to float on the water surface without sinking. The device has the advantages that after a car is provided with the device, when the car falls into deep water accidentally, the car can float on the water surface, and life safety of people in the car is protected.

Description

Technical Field

[0001] It belongs to the field of using the vehicle's external airbags to inflate to increase the car's buoyancy when the car falls into water, so that the car floats on the water surface and protects the lives of people in the car. Background Art

[0002] At present, various small cars on the market generally do not have the emergency floating function. When a vehicle accidentally falls into a deep water area, it will soon sink to the bottom of the water. Due to the high water pressure on the vehicle, the door cannot be opened in time, and the time left for the people in the car to escape is very short, generally only about 3 to 5 minutes, which seriously threatens the life safety of the people in the car. Currently, only a few high-end models worth millions, such as Yangwang U8, have emergency floating function, and they can only achieve emergency floating by relying on their own good sealing to generate greater buoyancy when the vehicle is in good condition. If the vehicle is used for a long time, the body deformation, rubber seal wear and aging, etc. will affect the sealing of the vehicle. Once the sealing performance decreases, this function will weaken or even fail, and it will not be able to protect the life safety of the people in the car.

[0003] The technical advantages of this invention of our company are: it has wide applicability and can play a good role in floating water and protecting the lives of people in the car after being installed on any car. It does not rely on the buoyancy generated by the sealing of the vehicle itself. Regardless of whether the vehicle is new or old, or in what condition, as long as the device of this invention technology is installed, when the vehicle falls into deep water, it will automatically inflate the four airbags installed under the chassis of the car and distributed in the front, rear, left and right directions of the chassis. Under the dual forces of the upward buoyancy of the water on the airbags converted into the upward pulling force on the vehicle and the upward buoyancy of the water on the vehicle itself, it achieves a balance with the sum of the total downward gravity of the vehicle itself and the people and objects in the car, so that the car can float on the water for a long time (at least more than one hour), giving the trapped people in the car enough time to ask for help or escape. Summary of the invention

[0004] The basic principle of the present invention is that an object immersed in water is subject to the upward buoyancy of the water, and the magnitude of the buoyancy is equal to the weight of the water displaced by the object. An object floating on the water surface is subject to the upward buoyancy of the water, which is also equal to the weight of the water displaced by the object, which conforms to the buoyancy formula: Fbuoy = Gdisplace. When an object is completely immersed in water and the buoyancy of the water is greater than its own weight, the object will float up and eventually float on the water surface, achieving a balance between buoyancy and gravity. The opposite is also true, that is, when an object floating on the water surface gradually decreases due to the gradual reduction in the volume of water displaced, the buoyancy it receives will also gradually decrease. When the buoyancy it receives is less than its own weight, the object will gradually sink.

[0005] When a car is completely immersed in water, a large amount of water will flow into the car. The amount of water that is displaced at this time is much less than when it first falls into the water. The buoyancy of the water will decrease as the amount of water flowing into the car increases. When the buoyancy is less than the sum of the weight of the vehicle itself and the weight of the people and items in the car, the vehicle will gradually sink. If equipped with an airbag of appropriate specifications, the sum of the displacement of the airbag expansion plus the vehicle's own sinking displacement (the displacement when the vehicle is completely immersed in water and the interior of the car is also filled with water) is greater than the sum of the weight of the vehicle and the people and items in the car, the vehicle will float on the water and will not sink.

[0006] This technical device is to inflate the airbag by automatically releasing the compressed gas in the "high-pressure gas container" stored in the main unit of the device inside the car when the car falls into the water. The gas passes through the "air pipe" connected between the "high-pressure gas container" and the "airbag" to inflate the "airbag" until it is full. Since the upward buoyancy of the water on the "airbag" in the water is converted into an upward pulling force on the vehicle, and the upward buoyancy of the water on the vehicle itself in the water (the sum of the displacement caused by the expansion of the airbag and the sinking displacement of the vehicle is greater than the sum of the weight of the vehicle itself and the weight of the people and objects in the car), the car floats on the water, giving the people in the car sufficient time to call for help and escape, protecting the lives of the passengers, and also facilitating the towing of the vehicle back to the shore, reducing the degree of damage to the vehicle caused by falling into the water.

[0007] All electrical appliances, electronic components, motors, circuits and circuit interfaces used in the device of the present invention must be waterproof and rust-proof, and covered with a waterproof and heat-dissipating protective coating. The main unit housing is also sealed and waterproof to prevent water from entering the interior of the main unit, ensuring that it can continue to work stably when immersed in water for a long time.

[0008] The technical device of the present invention mainly consists of the following four parts:

[0009] 1. Sensor; 2. Host; 3. Air pipe; 4. Airbag assembly.

[0010] 1. Sensor

[0011] The sensors in this device include water level sensor and fingerprint sensor:

[0012] (1) Water level sensor - The function of the water level sensor is to transmit water level signals to the host through wires. The water level sensor contains components that are sensitive to changes in water level and wires that transmit signals. This device uses three water level sensors, one of which is installed in a hidden position under the vehicle chassis (to avoid loss of function due to bumps, scratches, etc., and is generally installed in the middle of the rear section of the vehicle) to transmit external water level change signals to the host. The other two are installed in the cab, one of which is installed above the driver's right foot, 20 cm above the floor of the vehicle, and the other is installed slightly above the driver's right knee, 60 cm above the floor of the vehicle. These two water level sensors transmit internal water level change signals to the host. All three sensors are connected to the host through a "12-core integrated interface" with wires to realize the function of transmitting water level change signals to the host, so that the host can automatically decide whether to open the airbag box to release the airbag and inflate the airbag according to the changes in the signals inside and outside the vehicle. The host will not automatically start up if it receives the external water level signal or the internal water level signal alone, avoiding unnecessary losses caused by misjudgment of startup.

[0013] (2) Fingerprint sensor - The main function of the fingerprint sensor is to replace the water level sensor to send instructions to the host when the water level sensor fails, open the airbag box to release the airbag, open and close the high-pressure gas container valve in the host in an emergency, inflate the airbag, and realize the vehicle's floating function. The fingerprint sensor is installed near the third water level sensor, also on the right side of the vehicle body slightly higher than the driver's right knee, 60cm above the floor. When the vehicle falls into a deep water area, if the water level sensor fails (due to bumps, scratches, vibrations, etc., the sensor is damaged, lost, poorly contacted, disconnected from the wire, etc.) and cannot transmit the water level signal to the host, the device cannot automatically release the airbag and inflate the airbag, the vehicle cannot float, and the lives of people in the vehicle cannot be protected. At this time, the driver can press the "power on" button of the fingerprint sensor with his finger to send a command to the host, so that the host can directly connect the circuit between the "12v3.2Ah battery" in the host (equipped with the host of this device, specially used for the power system of the device of the present invention, in order to avoid the host from being unable to work normally after the vehicle falls into water and loses power) and the "airbag box switch motor" (a micro-reduction motor with a DC voltage of 12v, a speed of 60 rpm, and a torque of 2Kg.cm), and power the motor to open the airbag box and release the airbag. At the same time, the circuit between the "12v3.2Ah battery" in the host and the "high-pressure gas container valve switch reduction motor" (DC voltage of 12v, speed of 5 rpm, torque of 22Kg.cm) is also connected, and the reduction motor is powered to open the high-pressure gas container valve to inflate the airbag. The "fingerprint sensor" and "airbag box switch motor" are connected to the host through a "12-core integrated interface" with wires to transmit instructions to the host to make the "airbag box switch motor" open the airbag box to release the airbag, and to give the "high-pressure gas container valve switch reduction motor" on and off instructions to inflate the airbag.

[0014] 2. Host

[0015] The main function of the host is to receive the water level signal from the water level sensor and the driver's power on / off command from the fingerprint sensor, and decide whether to open the airbag box and inflate the airbag according to different situations.

[0016] There is only one host, and the length, width and height of the outer volume are 75 / 20 / 25cm 3 The shell is a closed rectangular metal box with good waterproof and rust-proof performance. The waterproof level is IP68 to prevent water from entering the host when the car is flooded and affecting the normal operation of the host. Although the host shell is waterproof, all the electrical appliances, electronic components, front and back of the circuit board, line connectors, etc. inside must also be waterproofed for the second time and covered with high-quality waterproof coating to ensure that it can work normally and stably even if water enters the host.

[0017] The main engine is equipped with: a high-pressure gas container (for the health and personal safety of the driver and passengers, the high-pressure gas container in the invention device can only store compressed air or compressed oxygen, and cannot store toxic, harmful, flammable, explosive and other gases that are harmful to the human body. According to the weight of the vehicle, the general volume is selected between 6-9L. The vehicle with a dead weight of less than 2 tons is equipped with a 6L high-pressure gas container, and the vehicle with a dead weight of more than 2 tons is equipped with a 9L high-pressure container. The safety pressure is ≥30Mpa, the test pressure is ≥50Mpa, and the working pressure is often maintained at 28Mpa), some functions for processing signals, voltage stabilization, There are electronic components for charging, backflow prevention, etc., as well as relays that act as circuit on / off switches, solenoid valves that help to automatically open and close the gas, a 12v3.2Ah dry battery, and a reduction motor with a DC voltage of 12v, a speed of 5 rpm, and a torque of 22Kg.cm (the "high-pressure gas container valve switch reduction motor" mentioned in the specification of the present invention are all reduction motors of this model, and the "airbag box switch motor" are all miniature reduction motors with models: DC voltage 12v, speed 60 rpm, and torque 2Kg.cm).

[0018] A display is installed at one end of the host, which can display the battery voltage and power, and a pressure gauge can display the pressure of the high-pressure gas container. Four external interfaces are reserved, one "airbag exhaust" button switch, and one "tire inflation" button switch. The four interfaces are divided into: 12-core integrated interface, charging interface, airbag inflation interface, and external deflation interface. Two buzzer alarms with a waterproof grade of IP68 are installed at the other end. One function is to buzz an alarm when the battery voltage is lower than 11.5V, prompting manual charging, and the other function is to buzz an alarm when the pressure of the high-pressure gas container in the host is greater than 30Mpa. When the device cannot automatically deflate and reduce pressure, it reminds you to deflate and reduce pressure manually.

[0019] The host has an independent power supply system

[0020] The host of the device of the present invention is equipped with a 12v3.2Ah battery for separate use, which is not shared with the vehicle. When the battery voltage is slightly insufficient, the charging line on the vehicle is used to power the charging unit in the host through the charging interface on one side of the host, and the charging unit charges the battery to ensure that the battery power is always sufficient. In addition, through circuit design, the power of the battery in the host is prohibited from flowing back to the vehicle to prevent the battery from running out of power. When the vehicle falls into water and the vehicle's own original power supply system is turned off and no power is supplied, the device of the present invention has sufficient voltage and power to work normally. The power-out alarm function of this system is that when the charging unit fails, the 12v 3.2Ah battery runs out of power, and the voltage is lower than 11.5v, the buzzer alarm sounds to remind manual charging.

[0021] High-pressure gas container in-vehicle high temperature safety test

[0022] The high-pressure gas container used in the device of the present invention must be an explosion-proof high-pressure gas cylinder produced by a regular manufacturer, a qualified product that has undergone strict factory inspection, and complies with the national standard GB / T28053-2011, with a working pressure of 30Mpa and a test pressure of 50Mpa.

[0023] Test conditions: In a sunny day with an outdoor temperature of 37°C, the test vehicle was exposed to the sun, and the high-pressure gas container was placed in the car. The sun's rays were allowed to directly shine through the unfilmed glass for more than 4 hours inside and outside the vehicle. The container was shielded by an opaque object. When the temperature inside the car reached a maximum of 73.6 degrees, the pressure of the container rose from 28Mpa to nearly 29Mpa, which did not exceed the normal working pressure of 30Mpa. In the same high temperature environment with an outdoor temperature of 37°C, the test vehicle was exposed to the sun, and the test container was placed in the car. The sun's rays were allowed to directly shine through the unfilmed glass for more than 4 hours. When the temperature inside the car also reached a maximum of 73.6 degrees, the pressure of the container rose from 28Mpa to 29.8Mpa, which did not exceed the normal working pressure of 30Mpa. In fact, the experimental pressure of the high-pressure gas container is 50Mpa, that is, it will not break when filled with water and pressure tested to 50Mpa. In other words, in an extremely high temperature natural environment, the pressure of the high-pressure gas container only increases by nearly 2Mpa. As long as the pressure is maintained at 28Mpa at ordinary times, it will fluctuate within the safe working pressure range and will never reach 50Mpa. This shows that the high-pressure gas container selected for use in the invention is safe and reliable.

[0024] Functions of the four interfaces:

[0025] 1. 12-core integrated interface - connection function. The water level sensor, fingerprint sensor, airbag box switch, etc. are all connected to the host through the interface with wires. The water level sensor transmits water level change signals to the host. The driver presses the "on" and "off" keys of the fingerprint sensor to transmit the opening and closing instructions of the high-pressure gas container valve to the host. The host also transmits the opening instructions to the airbag box through this interface. All of these are realized through this interface.

[0026] 2. Charging interface - charging function. The vehicle with 12v voltage wire is connected to the host through the charging interface. The current passes through the charging and voltage stabilizing components inside the host to charge the 12v3.2Ah battery in the host, ensuring that the battery power is always sufficient and stable.

[0027] 3. Airbag inflation interface - connect the air pipe to inflate the airbag. The inner end of the airbag inflation interface is connected to the high-pressure gas container valve in the host, and the outer end of the host is connected to the air pipe leading to the airbag. The host can automatically start the high-pressure gas container valve switch reduction motor (the motor has a DC voltage of 12V, a speed of 5 rpm, and a torque of 22Kg.cm) only when it receives the water level change signals from the two water level sensors outside and inside the vehicle in succession. The reduction motor transmits the torque to the high-pressure gas container valve through a coupling (one end of the coupling is fixed on the output shaft of the reducer, and the other end is fixed on the rotating shaft of the high-pressure container valve, and the two shafts are on the same axis) to open the valve to a set degree. The compressed air passes through the interface and inflates the airbag through the air pipe. When the set inflation time ends (the set time is determined according to the specifications of the airbags equipped with different models. Generally, models below 2 tons can fill 4 airbags in 3 minutes, and models around 3 tons can fill 4 airbags in 4 minutes. The setting time function is realized by the time relay in the host), the four airbags are filled with air, and the valves are reversed by the reduction motor to automatically close the valves. The outer end of the interface is a threaded sealed connection with a rubber sealing ring, the installation end is an internal thread, and the device connection end is an external thread. In order to ensure air tightness, a tight connection is ensured during installation.

[0028] 4. External venting interface - The external venting interface is not allowed to be blocked. It has three main functions: (1) Safety function. Due to the extremely high temperature outside, the gas in the high-pressure gas container expands due to heat, and the pressure increases. When it exceeds the working pressure range of 30Mpa and reaches the pressure reduction value set on the pressure gauge, the "pressure pointer" on the pressure gauge and the "set pressure pointer" contact and conduct electricity, automatically connecting the circuit of the battery and the reduction motor that controls the valve of the high-pressure gas container. The reduction motor rotates counterclockwise to open the valve to release gas. At the same time, the solenoid valve circuit in the valve and the venting interface channel is also connected. The solenoid valve opens, and the gas channel leading to the external venting interface is opened. The high-pressure gas is vented and reduced in pressure through the external venting interface (at this time, the solenoid valve in the gas channel of the high-pressure valve to the airbag is not energized, and this gas channel is in a closed state, and no gas is supplied to the airbag). Through automatic venting, when the pressure of the high-pressure gas container is lower than 30Mpa, the "pressure pointer" and the "set pointer" of the pressure gauge are separated and powered off. The solenoid valve is automatically closed after the power is off, and the gas channel leading to the external venting interface is closed, and the venting is completed. At this time, the valve of the high-pressure gas container is open, but the solenoid valves on each gas channel are closed. The entire gas circuit is closed and will not leak to the outside. If the high-temperature period is over, you can manually press the fingerprint "shutdown" button installed in the cab near the driver's right knee to close the high-pressure gas container valve. (2) Airbag exhaust: When the gas in the airbag needs to be discharged (at the end of floating or inspection), manually press the "airbag exhaust" button switch at one end of the device (this is a "normally pressed" button) to energize the corresponding solenoid valve. The solenoid valve is opened, and the gas in the airbag flows back through the air pipe, passes through the solenoid valve, and then deflates the airbag through the external deflation interface. (3) Tire inflation: When the tire pressure is insufficient while the car is driving, a hose can be connected between the external deflation port and the tire inflation nozzle. By pressing the "tire inflation" button switch (this is also the "normally pressed" button), the reduction motor that controls the high-pressure gas container valve is powered to open the high-pressure container valve and release the compressed gas. Pressing this button can also control the solenoid valve, so that the gas channel leading to the airbag is also closed, and the gas channel leading to the external deflation interface is open to inflate the tire. After the inflation is completed, release the button, the solenoid valve is powered off and closed, and the gas path is closed. The high-pressure gas container valve can be closed by pressing the fingerprint "power off" button near the right side of the driver's right knee.

[0029] The two button switches are "normally pressed" (press and hold to turn on the power, release to turn off the power): long press the "airbag exhaust" button to exhaust the airbag, stop pressing to stop exhausting. Long press the "tire inflation" button to inflate the tire, and cooperate with the "off" button of the two fingerprint switches to achieve the function of inflation and gas shutoff. To inflate the tire, you can only press the "tire inflation" button on the side of the host, and you cannot use the fingerprint "on" button in the cab, because pressing the "tire inflation" button opens the high-pressure gas container valve and the solenoid valve between this valve and the "external deflation interface", and does not open the airbag box. However, if you press the fingerprint "on" button in the cab, the high-pressure gas container valve and the solenoid valve between this valve and the "airbag inflation interface" are opened, and the four airbag boxes are opened at the same time, the airbags are released and inflated, and the solenoid valve of the "external deflation interface" is not opened. The fingerprint "off" button only closes the high-pressure gas container valve for 10 seconds. The reason for setting two "normally pressed" button switches is that these two button switches are not often used, and it will also avoid the problem of excessive gas loss caused by accidentally opening the switch.

[0030] 3. Trachea

[0031] The main function of the air pipe in the device is to transport and distribute the high-pressure gas released from the high-pressure gas container to the air bags at different positions without leakage.

[0032] In order to adapt to certain harsh environments and ensure that the air path between the high-pressure gas container and the airbag is unobstructed and leak-free, the air pipe material used to make this device must be resistant to high pressure, corrosion, high strength, good plasticity, bending resistance, and high and low temperature resistance. The copper tube that meets the national standard GB / T1527-2017 "Seamless Copper Tube and Seamless Copper-Nickel Alloy Tube", with a pressure resistance of 40Mpa, a hardness of HB35-40, and a melting point of 1083℃, is a more suitable material. The outer diameter of the tube is 8-10mm and the inner diameter is 6-8mm. The length depends on the vehicle model and demand.

[0033] One end of the "air pipe" is threadedly connected to the "air bag inflation interface" on one side of the main unit, and the other end is seamlessly connected to the four air bag air inlet pipes through the four air pipes branched out from the air distribution port, so as to achieve the purpose of inflating the "air bag".

[0034] Selection instructions for trachea material, length, thickness and specifications:

[0035] 1. The material from the main engine to the gas distribution port is 99.9% copper, with an outer diameter of inner diameter The length of the copper tube is generally 2 meters.

[0036] 2. From the air distribution port to the vehicle head airbag, the content is 99.9% copper material, the outer diameter inner diameter The length of the copper tube is generally 0.5 meters.

[0037] 3. From the air distribution port to the airbags on both sides of the vehicle, the content is 99.9% copper material, the outer diameter inner diameter The length of the copper tube is generally 1.5 meters.

[0038] 4. From the air outlet to the rear airbag of the vehicle, the content is 99.9% copper material, the outer diameter inner diameter The length of the copper tube is generally 2 meters.

[0039] The copper tubes used as air pipes in this device are selected and connected strictly in accordance with the above specifications.

[0040] 4. Airbag assembly

[0041] The airbag assembly is mainly composed of several parts, including the airbag box, airbag, airbag protection bag, and stainless steel metal strips that prevent the airbag protection bag from falling off the car chassis. Each part has different important functions, but the overall function is to protect the airbag, prevent the airbag protection bag from falling off the car chassis, and transmit the buoyancy of the airbag in the water to the vehicle, helping the vehicle to float.

[0042] 1. Airbag box - The function of the airbag box is to store and protect the airbag and the airbag protection bag, and release the airbag and the airbag protection bag when needed. The material of the airbag box: It is made of hard plastic with a mechanical strength of more than 200Mpa, with good mechanical impact resistance, friction resistance and corrosion resistance, which can better protect the integrity of the airbag and prevent the airbag from being damaged and leaking due to external impact, friction and other conditions in the airbag box, and losing the functions of inflating, storing air and generating buoyancy in water. It consists of a box body, a box cover, an airbag box lock, and a stainless steel metal strip to prevent the airbag protection bag from falling off the vehicle chassis. The airbag box lock is located on one side of the airbag box body to control the opening and closing of the airbag box. The airbag and the airbag protection bag are folded multiple times, and the folded shape is basically consistent with the shape of the airbag box, and the volume is slightly smaller than the airbag box. Then it is placed in the airbag box to store and protect the airbag. In principle, the size of the airbag box should be able to accommodate the folded airbag and airbag protection bag, and the shape is determined according to the chassis shape of different vehicles. According to the characteristics of the car chassis, the airbag box installed in the front section of the car chassis is rectangular in shape, and the length, width and height of the volume are generally: 55 / 35 / 5cm 3 The airbag boxes installed at the rear section and the left and right sides of the chassis are mostly rectangular in shape. The length, width and height of the airbag box at the rear section of the chassis are generally: 80 / 7 / 3.9cm 3 The length, width and height of the airbag boxes on the left and right sides are generally: 70 / 12 / 3cm 3. The shape of the airbag box can also be customized to meet the characteristics of the chassis of some vehicles with special shapes. The airbag box cover and the box body are usually closed and locked. When the airbag needs to be released according to the situation, the waterproof micro-reduction motor installed on one side of the airbag box body starts, opens the airbag box lock, and releases the airbag. The switch motor of the airbag box is automatically controlled by the host. The host supplies power to the "airbag box switch motor". When the motor works, the airbag box lock opens, and the airbag box opens at the same time. When closing, the airbag needs to be evacuated to a vacuum state, folded together with the protective bag wrapped outside the airbag, and placed in the airbag box body, and then the airbag box cover is manually closed and locked.

[0043] 2. Airbag - The function of the airbag in the present invention is to generate buoyancy. The airbag filled with gas is subjected to the upward buoyancy of the water in the water, and is converted into an upward pulling force on the vehicle through the airbag protection bag, so that the vehicle that falls into the deep water area floats on the water surface and does not sink within a certain period of time. The material used to make the airbag must have the following 12 characteristics: (1) good air tightness; (2) not easy to tear after inflation; (3) light and thin; (4) high flexibility; (5) abrasion resistance; (6) certain impact strength; (7) waterproof; (8) high and low temperature resistance (adaptable temperature range -50-100℃); (9) corrosion resistance; (10) oil resistance; (11) not easy to oxidize and decompose; (12) can be bonded by glue and hot melt method. According to the above principles, the "TPU" film material complies with the HG / T5070-2016 "Thermoplastic Polyurethane (TPU) Film" standard and fully meets the above requirements. Therefore, airbags are generally made of TPU film material with a thickness of about 0.2mm. Two pieces of TPU film of the same size are processed into an airbag. The four sides of each piece of material are aligned with the four sides of the other piece of material. The selected materials are heat-sealed together on all sides with a high-frequency heat sealing machine (the "airbag inlet pipe" and "airbag deflation pipe" are left unheated. After the entire airbag is heat-sealed, the two air pipes are placed in the reserved opening and reinforced with special glue). After heat sealing, good air tightness and no air leakage are guaranteed under a certain pressure.

[0044] An "airbag intake pipe" is provided at one corner of the airbag close to the chassis of the car, and an "airbag deflation pipe" is provided at the other corresponding corner. The "airbag intake pipe" is controlled by the host and has both intake and deflation functions (the intake pipe of the vehicle head airbag only has an intake function). When the airbag needs to be inflated, the compressed gas is released by the host, flows through the "trachea" and "airbag intake pipe" into the airbag, and the airbag expands to generate buoyancy in the water. When the gas in the airbag needs to be discharged, the gas in the airbag can flow back through the "trachea" under the control of the host under its own pressure. The refluxed gas cannot enter the "high-pressure gas container" and can only be discharged through the host's "external deflation interface". The function of the "air bag deflation pipe" is only to deflate air. It is normally closed to ensure that when the air bag is inflated, the entire air bag is in a closed state except for the "air bag air inlet pipe" that can take in air. In this case, the air bag will expand when it is inflated and produce buoyancy in the water. Only when the gas in the air bag needs to be discharged, the "air bag exhaust pipe" valve can be opened to allow the gas in the air bag to be discharged from the "air bag deflation pipe" by its own pressure. Finally, the small amount of remaining gas can be discharged by pressing the air bag by hand, or the remaining gas can be extracted with a small vacuum device.

[0045] The air intake pipe of the vehicle's head airbag can only take in air, but cannot deflate through the intake pipe. When deflated, this airbag can only deflate through the deflation pipe. Because the head of the vehicle is heavier than other parts, this airbag is under greater pressure. If this airbag can return air, it will discharge gas under heavy pressure to the airbag with relatively lower pressure, causing the front of the vehicle to gradually sink in the water due to reduced buoyancy. The other three airbags are interconnected, which is more conducive to the vehicle maintaining balance in the water under the action of buoyancy.

[0046] The head airbag of the vehicle cannot be confused with the airbags in other parts, and the air pipe of the head airbag of the vehicle cannot be confused with the air pipes of airbags in other parts. Because the front of the vehicle is heavier than other parts, the air pipe length from the air distribution port to the head airbag of the vehicle must be the shortest, so as to give priority to the air supply to this airbag, so that the front of the vehicle can obtain greater buoyancy earlier, and avoid the vehicle from tilting too much downward due to the heavy weight of the front of the vehicle after entering the water, which will put greater psychological pressure on the people in the vehicle. The second is the airbags on both sides of the vehicle. While supplying air to the front airbag, some gas is distributed to the airbags on the left and right sides of the vehicle, which is conducive to the vehicle to maintain balance in the water. Since the rear of the vehicle is lighter, and the vehicle fuel tank is generally located under the rear of the vehicle, it is more reasonable to arrange the rear airbag to be supplied with air last. By configuring different air pipe diameters and different air pipe lengths for airbags in different positions, the different sizes of air supply to different airbags can be controlled to achieve the order of full expansion in accordance with the regulations, so as to achieve the purpose of making the vehicle float steadily in the water.

[0047] Car sinking and drainage test data - about 90% of household cars weigh less than 2 tons, and most of them are around 1.5 tons, so the 1.5-ton and 2-ton models in the experiment are widely representative. The data obtained from the experiment are as follows: Taking the Volkswagen 1.8T Passat as an example, a 1.5-ton car can displace 0.9M of water when fully submerged in water. 3 volume of water, that is, theoretically, as long as the four air bags are fully inflated, the sum of the volumes is greater than 0.6M 3 , a 1.5-ton vehicle can float on the water without sinking. However, in actual applications, it should be considered that there are often people and objects in the vehicle, and that people and objects can also generate a certain amount of buoyancy in the water, and that the volume of the airbag will be slightly compressed in the water after it is inflated. The sum of the inflated volumes of the four airbags should be between 0.7 and 0.9 m 3 For example, a 2-ton Toyota Highlander with a displacement of 2.5 tons can displace 1.1M when completely submerged in water. 3 Theoretically, as long as the four air bags are fully inflated, the total volume is greater than 0.9M 3 , the vehicle can float on the water without sinking. However, in actual applications, comprehensive factors such as the weight of people and objects in the vehicle and the fact that people and objects can also generate a certain amount of buoyancy in the water should be considered. The sum of the expansion volumes of the four airbags equipped with a 2-ton vehicle should be between 1 and 1.2 m 3 For other models of different weights, the airbag specifications can be increased or decreased in the same proportion.

[0048] The four airbags for a 2-ton vehicle have the following specifications for plane deployment and the actual displacement when fully inflated and pressed into the water:

[0049] (1) Vehicle front airbag plane specifications 129 / 96cm 2 The actual displacement after being fully inflated and pressed into the water is 0.317M 3 :(2) Vehicle rear airbag plane specifications 90 / 96cm 2 The actual displacement after being fully inflated and pressed into the water is 0.182M 3 (3) The plane specifications of the airbags on both sides are 129 / 96cm 2 The actual displacement of a fully inflated trolley pressed into the water is 0.317M. 3 , two are 0.634M 3 The total displacement of the four airbags when fully inflated is 1.133 m. 3 .

[0050] 2 ton vehicle sinks and drains 1.1 m 3 , adapted to four airbags with a total displacement of 1.133M 3 The sum of the two is 2.233M3 , the total displacement weight is 2.233 tons, which is greater than the vehicle's own weight, so it is fully guaranteed that the vehicle can float on the water without sinking. In actual use, the vehicle should not sink completely, but the area between 20cm and 30cm below the window will be exposed above the water surface, and part of the airbags on the left and right sides will also be exposed above the water surface. At this time, the total buoyancy is equal to the total gravity of the vehicle and the people and items. The two are in a balanced state, and the vehicle will float on the water without sinking. 3. Airbag protection bag - The functions of the airbag protection bag are: (1) Protect the airbag. Prevent the airbag from direct contact with the outside world to prevent the airbag from being punctured or scratched. (2) Transfer buoyancy. Transfer the buoyancy of the airbag in the water to the vehicle, and firmly connect the airbag and the car chassis through the "airbag protection bag" so that the buoyancy of the airbag in the water is converted into an upward pulling force or lifting force on the car chassis through the airbag protection bag, and then transferred to the car, so that the vehicle floats on the water. After the two symmetrical airbags installed on both sides of the car chassis are inflated, the airbag protection bag will expand with the airbags. Under the buoyancy of water, they will be distributed to the outside of the left and right front doors. The airbags and airbag protection bags will be attached to the lower half of the outside of the left and right front doors together. Through the connection between the airbag protection bag and the car chassis, the car will be provided with an upward pulling force. After the two airbags at the front and rear of the car are filled with gas and inflated, the airbags and the upper part of the airbag protection bag will be attached to the bottom of the car chassis together, providing an upward lifting force to the car. The four airbags provide four upward forces to the car, plus the buoyancy of the vehicle itself. Under the joint action of these five forces, the sum of these five buoyancy is equal to the sum of the gravity of the vehicle, the people in the car, and the items in the car. That is, the total buoyancy is equal to the total gravity, so that the vehicle can float steadily on the water.

[0051] Airbag protection bag installation requirements: The airbag is installed in the airbag protection bag. The airbag protection bag, the stainless steel metal strip that prevents the airbag protection bag from falling off the vehicle chassis, the airbag box, and the vehicle chassis are firmly connected with stainless steel bolts to ensure that the airbag does not separate from the vehicle after it is fully inflated in the water and generates buoyancy.

[0052] The material used to make airbag protection bags must have the following 12 characteristics: (1) Fiber fabric with excellent flexibility; (2) High mechanical strength and impact resistance; (3) Friction resistance; (4) No obvious stretching ductility during high-intensity stretching; (5) No deformation or shrinkage when soaked by water; (6) Light and thin; (7) High and low temperature resistance; (8) Flame retardant; (9) Oil resistance; (10) Corrosion resistance; (11) Not easy to decompose; (12) Can be spliced, sewn or glued. According to the above principles, the "aramid cloth" material that meets the national standard GB / T20286-2006 fully meets the above requirements, with a gram weight of 200g / m 2 It is suitable to make the airbag protection bag with aramid fabric of about 1000 square meters.

[0053] Sewing of airbag protection bag: The specifications of airbag protection bag are consistent with the width of the airbag installed together, and the length is 10cm longer than the airbag. The sewing length is consistent with the airbag installed together, and the extra 10cm is used to connect with the vehicle chassis. According to the characteristics of aramid fabric, which is usually one meter wide and can be cut as needed, it is appropriate to use twice the length of the flattened airbag when there is no gas in it plus 20cm. Fold it in half in the length direction and sew it. The sewing width of the two sides in the same length direction is 2cm. There is a sewing line at the position where the distance from the bottom of the bag to the bag mouth minus 10cm. The length of the finished product is exactly 10cm longer than the length of the airbag. Before sewing this sewing line, first put the airbag into the airbag protection bag, and then sew this line. In this way, according to the size of the matching airbag, the size of the sewn part of the airbag protection bag is exactly the same as the airbag. Ensure that the sewing around is firm and not cracked, so as to avoid the airbag from overflowing from the cracks of the protection bag to the outside of the protection bag after inflation. The extra 10cm of fabric at the bag mouth is not sewn, and can be used to connect the 10cm of fabric to the car chassis with stainless steel bolts during assembly. According to the position of the air intake and exhaust pipes on the airbag, a suitable gap is left on the airbag protection bag without sewing, and the size should be suitable for passing the air pipe.

[0054] Taking a 2-ton vehicle as an example, the plane specifications and sewing specifications of the airbag protection bag used are as follows:

[0055] (1) Plane specifications of the vehicle front airbag protection bag: 139 / 100cm 2 , suture specification 129 / 96cm 2 ; (2) Vehicle rear airbag protection bag plane specifications: 100 / 100cm 2 , suture specification 90 / 96cm 2 (3) The airbag protection bags on both sides are the same as the front ones, with a flat surface specification of 139 / 100cm 2 , suture specification 129 / 96cm 2 ;

[0056] Installation position of the airbag assembly: In principle, the airbag assembly is installed in an area with a large recessed area on the vehicle chassis and cannot protrude from the lower plane of the chassis.

[0057] A car generally uses four airbag assemblies, which are installed at the front, rear, left and right positions under the car chassis. The specific positions are: (1) the front (front part) airbag assembly is installed in the depression of the chassis between the center point of the two front wheel axes and below the car gearbox; (2) the rear (rear part) airbag assembly is installed in the depression of the chassis near the center point of the two rear wheel axes; (3) the left airbag assembly is installed under the chassis corresponding to the position of the left front door, in the longitudinal depression on the inner side of the longitudinal raised strip of the jack fulcrum; (4) the right airbag assembly is installed under the chassis corresponding to the position of the right front door, in the longitudinal depression on the inner side of the longitudinal raised strip of the jack fulcrum.

[0058] Installation method of the airbag assembly: (1) First, apply 8 cm wide adhesive to the 10 cm excess fabric of the airbag protection bag. Place a stainless steel strip that is 3 cm shorter than the airbag box, 2 cm wide and 0.2 cm thick on the glue-coated side of the protective cover. Press down hard on the stainless steel strip to allow the two to adhere tightly together. Then flip the stainless steel strip in the direction of the glue coating and compact it. Do this three times and compact it. Wait until the two are firmly bonded before proceeding to the next step. (2) Along the center line of the length of the stainless steel bar, symmetrically punch two circular holes with a diameter of 0.9 cm on the stainless steel bar, with the center distance of the two circular holes being 30 cm. At the same time, punch through the fabric of the airbag protection bag attached to the stainless steel bar, and then put the stainless steel bar into the bottom of the airbag box. In accordance with the two circular holes on the stainless steel bar, punch two circular holes with the same distance and the same hole diameter at the bottom of the airbag box. Use the same method to punch two circular holes at the part of the car chassis where the airbag box is installed (a part that does not affect the safety of the vehicle), and then use 0.8 cm thick stainless steel bolts and nuts to firmly fix the stainless steel bar, airbag protection bag, airbag box, and car chassis. (3) Fold the airbag and airbag protection cover together and put them into the airbag box, cover the airbag box cover and lock it. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is the distribution diagram of the host, each airbag assembly and sensor; Figure 2 Figure 1 is the host computer. Figure 3 Figure 2 for the host; Figure 4 This is a diagram of the rear airbag assembly; Figure 5 The figure shows the assembly of the airbags on both sides; Figure 6 For the air bag diagram; Figure 7 It is the air bag protection bag diagram; Figure 8 This is a diagram of the front airbag assembly. DETAILED DESCRIPTION

[0060] When a vehicle equipped with the technical device of the present invention accidentally falls into deep water, the water level sensor installed under the chassis of the vehicle will be submerged in water. The moment the water level sensor touches the water surface, it will immediately transmit the first water level signal to the host through the wire via the 12-core integrated interface on the side of the host installed in the vehicle. This signal will cause the relay to energize, supply power to the host through the relay, wake up the host and turn it on, and the host will immediately enter the working state. Generally, when a vehicle falls into deep water, the front of the vehicle will be low and the rear of the vehicle will be high. About one minute after falling into the water, the water outside the vehicle will enter the interior of the vehicle through various gaps under the action of water pressure. Water will immediately accumulate at the footrests of the driver and co-driver seats in the car, and the water level will continue to rise. When the water level in the car rises to a position 20cm above the driver's right foot from the floor of the car, once the second water level sensor installed there touches the water surface, this water level sensor will immediately transmit a second water level signal to the host. After receiving the water level signals from the two water level sensors, the host supplies power to the four "air bag box switch motors" on the four air bag boxes through wires (these four motors are all miniature waterproof reduction motors with models: DC voltage 12v, speed 60 rpm, torque 2Kg.cm). The motor runs to open the air bag box lock, the air bag box opens, and the air bag with a protective bag is released. The host will simultaneously supply high-pressure air The body container valve switch reduction motor (DC voltage 12v, speed 5 rpm, torque 22Kg.cm reduction motor) provides reverse voltage, the reduction motor rotates counterclockwise, driving the valve knob to rotate counterclockwise to open the valve, releasing high-pressure gas to inflate the four airbags. When the set 10 seconds is up, the valve is basically fully opened, the motor stops powering on, the valve is in the open state, and the compressed gas quickly supplies air to the four airbags through the air pipe connected between the main engine and the four airbags. After the four airbags enter the compressed gas in turn, the compressed gas will expand rapidly, causing the airbags to inflate as well (the order in which the four airbags expand is: the airbags at the front of the vehicle expand fully first, followed by the airbags on both sides of the vehicle expanding at the same time, and finally the airbags at the rear of the vehicle expanding). The inflated airbags are subjected to the upward buoyancy that is converted into an upward pulling force on the vehicle. In addition, the car itself is also subjected to an upward buoyancy when it just falls into the water. The two buoyancy forces are superimposed, and the vehicle will not sink. As time goes by, it takes about 180 seconds for the four airbags to fully inflate. At this time, the buoyancy of the four airbags plus the buoyancy of the vehicle itself can make the vehicle float on the water. As long as the airbags are not leaking, the vehicle will not sink. When the vehicle floats stably on the water without sinking, when the set 180 seconds is up, the host gives the reduction motor a positive voltage, starts the reduction motor to rotate clockwise, drives the high-pressure gas container valve knob to rotate clockwise to close the valve, and automatically cuts off the power after 10 seconds.After the vehicle floats on the water for a period of time, if an airbag has a small amount of air leakage, the vehicle will sink a small amount due to the reduction of buoyancy after the airbag leaks, and the water level in the car will rise. When the water level in the car rises to a height of 60cm from the floor of the car, near the driver's knees, once the third water level sensor installed at this height touches the water surface, this water level sensor will transmit the third water level signal in the car to the host, and the host will give a reverse voltage to the reduction motor that controls the switch of the high-pressure gas container valve. The reduction motor rotates counterclockwise, driving the valve knob to rotate counterclockwise, so that the valve opens again to inflate the airbag. The internal pressure of the leaking airbag decreases due to gas leakage. The gas released from the high-pressure gas container will give priority to inflating the leaking airbag because the internal pressure of the leaking airbag is smaller. Due to the huge difference between the gas pressure of the high-pressure gas container and the gas pressure in the airbag, the inflation speed will be much greater than the leakage speed. After the airbag expands again, the vehicle body floats up under the action of buoyancy. When it reaches the original equilibrium position, the deflation valve rotates clockwise again to close the valve. This process will continue to occur repeatedly. According to experiments, if the airbag is not leaking, the vehicle will continue to float on the water without sinking. If there is a small leakage, it can continue for 1 to 2 hours without sinking, which can give people in the car enough time to escape or call for help.

[0061] Emergency measures: When the vehicle accidentally falls into deep water, if the "water level sensor" fails due to some unspecified factors (such as sensor damage, loss, poor contact, disconnection from the wire, etc. caused by bumps, scratches, vibrations, etc.), and cannot transmit water level signals to the host, the device host will not automatically inflate the airbag and cannot generate buoyancy. In this case, the driver can choose to manually press one of the two "fingerprint sensor" switches installed on the right side of the main driver's right knee (the reason for setting the "fingerprint sensor switch" here is to prevent children or others from accidentally pressing the power on button. The fingerprint sensor only stores the fingerprints of people who often drive the vehicle. Only people who have stored fingerprints can start or shut down the host by pressing the finger with the stored fingerprint. Pressing by other people is invalid). Pressing this fingerprint sensor "power on" button can directly connect the power supply line between the 12v3.2Ah battery in the host and the high-pressure gas container valve switch reducer motor and the four airbag box "switch reducer motors" (the "airbag box switch" reducer motor is 2 seconds) The airbag box opens quickly to release the airbag, and at the same time, the fingerprint sensor "power on" button provides reverse voltage to the reduction motor of the high-pressure gas container valve switch. The reduction motor rotates counterclockwise to force the high-pressure gas container valve to open (using a reduction motor with a DC voltage of 12v, a speed of 5 rpm, and a torque of 22Kg.cm. After setting the time to end in 10 seconds, the power will be automatically cut off. After the power is off, the valve is in the open state), so that the high-pressure gas container releases high-pressure gas, and the high-pressure gas inflates the four airbags through the air pipe. The airbags generate buoyancy after inflation. The upward buoyancy of the airbags is converted into an upward pulling force on the vehicle, which is transmitted to the vehicle through the airbag protection bag, causing the vehicle to gradually float until it floats on the water. When the driver feels that the vehicle is stably floating on the water, he presses the "shutdown" button of another fingerprint sensor that serves as a shutdown function. The "shutdown" button provides a positive voltage to the reduction motor (the motor on the valve of the high-pressure gas container body), and the reduction motor rotates clockwise, driving the high-pressure gas container valve knob in the main engine to rotate clockwise. The reduction motor with a DC voltage of 12v, a speed of 5 rpm, and a torque of 22Kg.cm is used. When the set 10-second time is over, the valve will be completely closed, and then the power will be automatically cut off, and the inflation will stop. If there is a small amount of air leakage in an airbag, the above opening and closing process can be repeated several times to achieve the same effect as automatic control, so as to achieve the purpose of allowing people in the car to escape safely.

Claims

1. Use the buoyancy generated by the inflation of the airbag to make the vehicle float on the water surface.

2. The airbags are fixed under the car chassis and are distributed in the front, rear, left and right positions under the car chassis.

3. Use high-pressure gas containers to store gas.

4. Use the compressed gas stored in the high-pressure gas container to inflate the airbag through the trachea.

5. Use the water level sensor to transmit the water level information inside and outside the vehicle to the host.

6. The airbag is installed in an airbag protection bag, which transmits the buoyancy of the airbag to the vehicle.

7. The airbag and the airbag protection bag are folded together and stored in the airbag box. The protection bag, the metal strip that prevents the protection bag from falling off the vehicle chassis, the airbag box, and the vehicle chassis are fixed together.

8. When the water level in the car reaches the installation position of the water level sensor, the water level sensor transmits the water level information to the host, and the host supplies power to the "switch reduction motor" of the airbag box. The "switch reduction motor" rotates to open the airbag box lock, and the airbag box opens to release the airbag.

9. Use motors and reducers to control the opening and closing of high-pressure gas container valves.

10. The airbag and the high-pressure gas container are connected by an air pipe.

11. The device host is placed inside the car, mainly in the trunk.

12. The main unit of the equipment has the function of deflation, which can inflate the tire when the tire is leaking.

13. Air or oxygen is stored in a high pressure gas container in the equipment.

14. Use the motor to drive the "airbag box lock" to open the airbag box and release the airbag.

15. Emergency fingerprint switch control motor: In the event that the water level sensor fails, use the fingerprint switch to power the reducer motor that controls the high-pressure gas container valve switch and the airbag box switch reducer motor, so that when the airbag box opens to release the airbag, the reducer motor of the high-pressure gas container valve also rotates to open the valve to inflate the airbag, while preventing losses caused by accidental pressing by others.

16. Use gas to drive the cylinder, and then the cylinder drives the "airbag box lock" to open the airbag box and release the airbag.

17. The host can only issue a command to open the airbag box and the high-pressure gas container valve after receiving two water level signals from outside and inside the vehicle.

18. When the pressure in the high-pressure gas container exceeds the set pressure, the high-pressure gas container will automatically deflate and reduce the pressure. When the pressure returns to below the set pressure value, the deflation will stop.

19. Independent charging, storage and power supply system. Ensure that the device can work stably when the vehicle falls into water and its own power supply system is disconnected.

20. Alarm device: alarm when the battery voltage is lower than the set value, and alarm when the pressure of the high-pressure gas container is higher than the set pressure.

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