Method and system for preventing and relieving serial rear-end collision of new energy vehicle and vehicle

Abstract

The invention discloses a method and a system for preventing and relieving serial rear-end collision of a new energy automobile and a vehicle, when a vehicle A and a vehicle B are subjected to first rear-end collision, an air blower of the vehicle B works to blow air to a warning air bag located at the tail part of the vehicle, and the warning air bag pops up to warn a normally running vehicle C; and when the vehicle B is subjected to rear-end collision by the vehicle C, the vehicle C impacts the warning air bag, and the air exhauster of the vehicle B works and controls the air in the warning air bag to be exhausted in a linear descending manner according to the collision impulse. The eye-catching warning device is released to remind a rear vehicle to brake and decelerate, even if the rear vehicle is not braked in time, the damage of secondary rear-end collision can be relieved after the rear vehicle collides with the device, and therefore the safety of people of the front vehicle and the rear vehicle is protected.

Description

Technical Field

[0001] The invention discloses a method, a system and a vehicle for preventing and alleviating a chain rear-end collision of an automobile, which belongs to the technical field of rear-end collision prevention of new energy automobiles, and specifically discloses a method, a system and a vehicle for preventing and alleviating a chain rear-end collision of a new energy automobile. Background Art

[0002] A series of rear-end collisions is an extremely serious type of traffic accident that may not only cause heavy casualties, but also lead to huge property losses. This type of accident is particularly harmful to new energy vehicles. Since the chassis of new energy vehicles is equipped with a battery pack, the design distance between the vehicle chassis and the battery pack may change after the first serious collision. If a second serious collision occurs later, other chassis components may cause serious damage to the battery pack, or even cause the battery pack to spontaneously combust, causing irreparable losses.

[0003] At present, there are some safety hazards in the industry's handling of rear-end collisions. Usually, the driver will turn on the vehicle's double flash lights after the accident, then get off the car and reverse 200 meters to place a triangular warning sign to alert the rear vehicle to the accident ahead. However, there are two major safety issues in this process:

[0004] First, after a rear-end collision, if there are still vehicles driving behind, the driver of the accident vehicle may not dare to get out of the car immediately to place the triangular warning sign for his own safety. If the vehicle behind is driving fast and the driver is not paying attention, he may slam on the brakes within the braking distance, thus causing a second rear-end collision.

[0005] Secondly, even if the driver places the warning triangle in time, the sight of the vehicle behind may be affected in bad weather conditions. Since the double flash lights and warning triangle are small, the driver of the vehicle behind may not be able to detect and react in time, which may also lead to a serious secondary rear-end collision.

[0006] Although modern vehicle navigation systems are already quite advanced and can promptly identify accidents ahead and remind drivers to pay attention to safety, not all drivers turn on the navigation system while driving, which means the risk of a chain rear-end collision still exists.

[0007] In view of the above situation, it is particularly necessary to develop a system for cars that can prevent chain rear-end collisions and reduce the impact of secondary rear-end collisions. This demand is more urgent for new energy vehicles because they are all equipped with battery packs. Reducing the damage caused by secondary rear-end collisions is crucial to ensuring the safety of vehicles and passengers. Summary of the invention

[0008] The present invention discloses a system for preventing and mitigating secondary rear-end collisions of vehicles, especially for new energy vehicles with battery packs. The present invention releases a striking warning device to remind the rear vehicle to brake and slow down. Even if the rear vehicle does not brake in time, the damage caused by the secondary rear-end collision can be reduced when the rear vehicle collides with the device, thereby protecting the safety of people in the front and rear vehicles.

[0009] The invention discloses a method for preventing and reducing chain rear-end collisions of new energy vehicles. The method for preventing and reducing chain rear-end collisions of new energy vehicles is as follows: when vehicles A and B have a first rear-end collision, a blower of vehicle B operates to blow air into a warning airbag located at the rear of the vehicle, and the warning airbag pops out to warn a normally traveling vehicle C; when vehicle B is rear-ended by vehicle C, vehicle C hits the warning airbag, and an air extractor of vehicle B operates, and the air extractor controls the linearly decreasing extraction of air in the warning airbag according to the collision impulse.

[0010] In a preferred embodiment of the present invention, after the first rear-end collision between vehicles A and B occurs, the blower of vehicle B is started based on a collision signal or is actively started by the driver and passengers.

[0011] In a preferred embodiment of the present invention, the blower blows air into the warning airbag, and when the actual air pressure value of the warning airbag is equal to the preset air pressure value of the warning airbag, the blower stops inflating to keep the air pressure value of the warning airbag constant.

[0012] In a preferred embodiment of the present invention, when the actual air pressure value of the warning airbag is greater than the preset air pressure value of the warning airbag, vehicle B is rear-ended by vehicle C, and the air pump operates to extract the air in the warning airbag, causing the air pressure in the warning airbag to decrease linearly.

[0013] In a preferred embodiment of the present invention, the specific steps include: Step 1: After the first rear-end collision occurs between vehicle A and vehicle B, the driver of vehicle B presses the button of the anti-consecutive rear-end collision and secondary rear-end collision mitigation system on the instrument panel, and the system is ready to start; Step 2: After the system receives the start signal, the blower operates to blow air into the warning airbag and pop the warning airbag out of the vehicle; Step 3: After the pressure sensor of the system receives the pressure in the warning airbag reaching the set value, the blower stops blowing air continuously and keeps the pressure of the warning airbag constant; Step 4: When vehicle C rear-ends vehicle B, when vehicle C hits the warning airbag, when the pressure of the warning airbag exceeds the limit value of the pressure sensor, the air extractor of the system starts to extract part of the gas from the warning airbag to keep the pressure of the warning airbag decreasing linearly until the pressure of the warning airbag reaches the lower limit pressure value, and the air extractor stops working and keeps the pressure of the warning airbag stable; Step 5: After the accident is handled, the driver of vehicle B presses the system stop button, the air extractor of the system starts to extract all the air from the warning airbag, and when the pressure sensor reaches the set value, the recovery motor works to recover the warning airbag into the system interior.

[0014] The present invention also discloses a system for preventing and mitigating consecutive rear-end collisions of a new energy vehicle, including a blower, a controller, an air extractor, a recovery motor, a warning airbag and a warning airbag storage box. The warning airbag storage box is arranged at the rear of the vehicle. The warning airbag storage box is internally provided with the warning airbag and the recovery motor. The air inlet of the warning airbag is connected to the blower, the air outlet of the warning airbag is connected to the air extractor, the controller is communicatively connected to the blower, the air extractor and the recovery motor, and the controller is electrically connected to the battery pack.

[0015] In a preferred embodiment of the present invention, the warning airbag is made of rubber material, PVC material or high-strength fiber material.

[0016] In a preferred embodiment of the present invention, the warning airbag storage box is arranged between the rear bumper beam and the rear bumper skin, and an opening needs to be designed at the position of the rear bumper skin corresponding to the pop-out port of the warning airbag.

[0017] In a preferred embodiment of the present invention, the inflated warning airbag is in a stepped circular ring structure, a cube structure or a "tu" character structure, both sides of the warning airbag extend to both sides of the vehicle body, and there are warning signs on the surface of the warning airbag.

[0018] The present invention also discloses a vehicle including the system for preventing and mitigating consecutive rear-end collisions of a new energy vehicle.

[0019] The beneficial effect of the present invention is that the eye-catching warning mark on the pop-up warning airbag can effectively remind the rear vehicle that a traffic accident has occurred in front, so that the driver of the rear vehicle can slow down and avoid it in time, thereby avoiding a chain rear-end collision. In addition, even if the driver of the rear vehicle does not slow down and avoid it in time, when the rear vehicle is close to the warning airbag and brakes, after the rear vehicle hits the warning airbag, the buffering effect of the warning airbag can effectively reduce the secondary rear-end collision damage of the rear vehicle and the accident vehicle, and effectively reduce the losses of a chain rear-end collision.

[0020] First, the method sets a warning airbag at the rear of the vehicle, which can be activated quickly after the first rear-end collision, greatly improving the warning effect of the rear vehicle. Compared with the traditional double flash lights and triangular warning signs, the warning airbag is larger and more eye-catching, and can effectively attract the attention of the rear vehicle driver in various weather conditions, thereby reducing the risk of chain rear-end collisions.

[0021] Secondly, the warning airbag of the system adopts an intelligent inflation and exhaust mechanism. After the initial collision, the system will automatically adjust the inflation state of the warning airbag according to the preset air pressure value to ensure that it always maintains the best warning effect. In the event of a secondary rear-end collision, the exhaust machine will control the air in the warning airbag to decrease linearly according to the collision impulse. This design can not only absorb part of the collision energy, but also reduce the impact on vehicle B, effectively reducing the damage caused by the secondary rear-end collision.

[0022] Furthermore, the system design of the present invention takes into account a variety of activation methods, including automatic activation based on collision signals and manual activation by the driver, which increases the flexibility and reliability of the system. At the same time, the system is also equipped with a pressure sensor that can accurately control the inflation and deflating process of the warning airbag to ensure that it plays the best role in the entire accident process.

[0023] In addition, the design of the warning airbag has also been carefully considered. It can be made of rubber, PVC or high-strength fiber materials, with good durability and safety. The shape of the airbag can be a stepped ring, a cube or a spherical structure, and extend to both sides of the vehicle body. This design not only increases the warning area, but also improves the protection effect of the vehicle. Warning signs are also added to the surface of the airbag to further enhance the warning effect.

[0024] Finally, the installation position of the system (between the rear anti-collision beam and the rear bumper skin) has been optimized to not affect the appearance of the vehicle, but to ensure that the warning airbag can be deployed smoothly when needed. The system is also equipped with a recovery mechanism, which can recover the warning airbag after the accident is handled for subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0026] Figure 1 A schematic diagram of a scenario used in the present invention;

[0027] Figure 2 Logic diagram used for the present invention;

[0028] Figure 3 It is a schematic diagram of the equipment of the present invention;

[0029] Figure 4 / 5 / 6 is the usage of the warning airbag of the present invention;

[0030] Figure 7 It is the state of the warning airbag after the gas of the present invention is exhausted;

[0031] Figure 8 It is the assembly position of the present invention on the whole vehicle. DETAILED DESCRIPTION

[0032] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention discloses a system for preventing and mitigating chain rear-end collisions of new energy vehicles, which comprises the following components: a blower 1, a controller 2, an air extractor 3, a recovery motor 4, a warning airbag 7 and a warning airbag storage box 9. The various components of the system form a fully functional safety system through a specific layout and connection method.

[0034] The warning airbag storage box 9 is arranged at the rear of the car, specifically between the rear anti-collision beam and the rear bumper skin. This design ensures the concealment of the system, does not affect the appearance of the vehicle, and can provide a certain degree of protection in the event of a collision. The rear bumper skin is designed with a special opening at the position corresponding to the ejection outlet of the warning airbag 7, so that the warning airbag can be quickly deployed in an emergency.

[0035] The warning airbag 7 is a key component of the system. It is made of high-performance materials, which can be rubber materials, PVC materials or high-strength fiber materials. The selection of these materials takes into account strength, toughness and durability, and can provide effective buffering during collisions. At the same time, it has good weather resistance and recyclability. The warning airbag 7 is designed in various forms. After inflation, it can present a stepped circular ring structure, a cube structure or a "tu" character structure. The design of these shapes increases the warning effect and provides a larger buffering area during collisions. The two sides of the warning airbag 7 extend to both sides of the vehicle body, increasing the warning area, so that the following vehicle can observe the warning signal from multiple angles. The surface of the warning airbag 7 is printed with warning signs, which can include reflective materials or fluorescent materials to improve visibility under various light conditions.

[0036] The operation process of the system is as follows: When the first collision occurs or the driver manually activates the system, the controller 2 issues an instruction to the blower 1. The blower 1 starts to work and inflates the airbag through the connection with the air inlet of the warning airbag 7. The inflation process is precisely controlled by the controller 2 to ensure that the warning airbag 7 can be quickly and fully deployed to achieve the best warning effect.

[0037] If a secondary rear-end collision occurs, the system enters the second-stage working mode. The air extractor 3 starts to work under the instruction of the controller 2 and extracts air from the airbag at a controllable rate through the connection with the air outlet of the warning airbag 7. The purpose of this process is to make the warning airbag 7 absorb part of the collision energy and slow down the impact force, thereby protecting the vehicle and its occupants.

[0038] When the danger is lifted or the accident is handled, the recovery motor 4 starts to work under the command of the controller 2. It retracts the deflated warning airbag 7 back into the warning airbag storage box 9 to prepare for the next possible use. This reusable design is environmentally friendly and can reduce the usage cost of the system.

[0039] The controller 2, as the core control unit of the system, is responsible for coordinating the work of each component and maintaining an electrical connection with the vehicle's battery pack. This ensures that the system can remain in a standby state during normal vehicle operation and respond quickly when needed. The controller 2 adopts advanced microprocessor technology and can make rapid and accurate judgments and responses based on the input information of various sensors.

[0040] The system for preventing and mitigating consecutive rear-end collisions of new energy vehicles of the present invention is a highly integrated and intelligent safety device. Through system design and advanced technology, the safety performance of new energy vehicles in rear-end collision accidents has been effectively improved. The system can effectively prevent the occurrence of consecutive rear-end collision accidents and, when a secondary rear-end collision is unavoidable, minimize its impact, providing an innovative solution for the safety performance of new energy vehicles.

[0041] Such as Figure 1 As shown, it discloses the use scenario of the present invention. When car B rear-ends car A, the driver of car B can activate the present invention to warn car C. If car C does not brake in time and brakes when it is close to the warning airbag, car C will hit the warning airbag. The warning airbag can buffer the impact of car C, thereby reducing the secondary rear-end collision damage of car C.

[0042] Attached Figure 2 For the logic of the present invention, the specific steps are as follows:

[0043] Step 1: Figure 1 Car B rear-ends Figure 1 In car A, the driver of car B presses Figure 3 The start button integrated into the instrument panel transmits the signal to Figure 3 In controller 2, the system starts working, the controller draws power from the battery pack and supplies Figure 3 The middle blower 1, the vacuum fan 3 and the recovery motor 4 consume electricity.

[0044] Step 2: Figure 3 The controller 2 in the vehicle controls the blower 1 to work, and the blower blows air into the warning airbag 6 in the storage box 9, so that the warning airbag pops out of the vehicle;

[0045] Step 3: Figure 3 The blower 6 in the airbag continues to blow air into the warning airbag until the warning airbag is fully deployed. Figure 4 The warning airbag is in fully opened state 10, Figure 4 9 is a system for preventing chain rear-end collision and reducing secondary rear-end collision of the present invention, which can be installed at a suitable position of the rear of the vehicle and assembled according to the overall layout requirements of the vehicle. Figure 4 Figure 11 is a view of the warning airbag from the rear of the vehicle to the front of the vehicle after the warning airbag is fully deployed;

[0046] Step 4: Integrate Figure 3 The pressure sensor of the middle controller 2 reads the air pressure value of the warning airbag. If the air pressure value reaches the set value, Figure 3 The blower 1 in the airbag stops inflating and continues to run to keep the air pressure of the warning airbag constant. Figure 1 The rear of car B is safe. Figure 1 The driver of vehicle C has identified the accident ahead and avoided the risk. The driver of vehicle B can get out of the vehicle to place the warning triangle and deal with the accident. After completing the process, the driver of vehicle B presses Figure 3 Press the stop button to stop the system and retract the warning airbag.

[0047] Step 5: When integrated Figure 3 When the air pressure value read by the pressure sensor of the controller 2 at a certain moment is greater than the set air pressure value of the warning airbag, it means Figure 1Car C in the diagram hits the warning airbag. Figure 3 Controller 2 in the control Figure 3 The air pump 3 in the warning airbag works to extract the air in the warning airbag, so that the air pressure in the warning airbag decreases linearly to strengthen the warning airbag Figure 1 The buffering effect of the middle C car;

[0048] Step 6: Figure 3 When the air pressure of the warning airbag 6 reaches the rated value, the vacuum pump stops working and keeps the pressure in the warning airbag constant. Figure 1 The drivers of cars B and C got out of their cars to deal with the accident;

[0049] Step 7: After the incident is resolved, Figure 1 The driver of vehicle B presses Figure 3 The stop button in the controller controls the vacuum pump 3 to work and completely evacuate the remaining gas in the warning airbag. The status of the warning airbag is as follows: Figure 7 As shown in 16;

[0050] Step 8: Figure 3 The controller 2 in the system controls the recovery motor 4 to work, and the recovery motor drives the recovery shaft 7 to rotate around the installation center. The recovery shaft 7 winds the pull wire 8 of the warning airbag 6 around the shaft, and the warning airbag pull wire pulls the warning airbag until it is all recovered into the warning airbag storage box 9. At this time, the system completes the work;

[0051] Attached Figure 8 For the assembly position of the present invention on the whole vehicle, the system can be assembled between the rear anti-collision beam and the rear bumper skin, and the rear bumper skin needs to be designed with an opening at the position corresponding to the ejection outlet of the warning airbag of the patent. Or the system can be installed at a position that is convenient for the safety warning airbag in the patent to eject, and a suitable position can be selected for installation according to the actual overall layout of the whole vehicle, and the battery pack 17 is set at the bottom of the frame.

[0052] The working steps of this system are as follows:

[0053] Step 1: After the first rear-end collision between vehicle A and vehicle B, the driver of vehicle B presses the button of the chain rear-end collision prevention and secondary rear-end collision mitigation system on the instrument panel, and the system is ready to start;

[0054] Step 2: After the system receives the start signal, the blower starts to blow air into the warning airbag and ejects the warning airbag out of the vehicle;

[0055] Step 3: When the pressure in the warning airbag received by the pressure sensor of the system reaches the set value, the blower stops blowing air and keeps the pressure of the warning airbag constant;

[0056] Step 4: When vehicle C rear-ends vehicle B and vehicle C hits the warning airbag, when the warning airbag pressure exceeds the limit value of the pressure sensor, the system's vacuum pump starts to extract part of the gas from the warning airbag, keeping the pressure of the warning airbag decreasing linearly until the pressure of the warning airbag reaches the lower limit pressure value, and then the vacuum pump stops working and keeps the pressure of the warning airbag stable;

[0057] Step 5: After the accident is handled, the driver of vehicle B presses the system stop button, and the system vacuum pump starts to extract all the air from the warning airbag. When the pressure sensor reaches the set value, the recovery motor starts to work and recover the warning airbag into the system.

[0058] Specific:

[0059] Example 1

[0060] This embodiment provides a method for preventing and reducing chain rear-end collisions of new energy vehicles, and the specific steps are as follows:

[0061] Step 1: After the first rear-end collision between vehicles A and B, the driver of vehicle B presses the button of the chain rear-end collision prevention and secondary rear-end collision mitigation system on the instrument panel, and the system is ready to start.

[0062] Step 2: After the system receives the start signal, the blower starts running, blowing air into the warning airbag and ejecting the warning airbag out of the car. The warning airbag is made of rubber material and has a stepped ring structure, extending to both sides of the car body, with a striking warning sign printed on the surface.

[0063] Step 3: When the system's pressure sensor detects that the pressure in the warning airbag reaches a preset value (eg, 2.5 bar), the blower stops blowing air and keeps the pressure of the warning airbag constant.

[0064] Step 4: When vehicle C rear-ends vehicle B, vehicle C hits the warning airbag. When the warning airbag pressure exceeds the limit value of the pressure sensor (e.g. 3 bar), the system's vacuum pump starts to extract some gas from the warning airbag. The vacuum pump controls the pressure of the warning airbag to decrease linearly according to the collision impulse, reducing the pressure at a rate of 0.1 bar per second until the pressure of the warning airbag reaches the lower limit pressure value (e.g. 1 bar). At this time, the vacuum pump stops working and keeps the pressure of the warning airbag stable.

[0065] Step 5: After the accident is handled, the driver of vehicle B presses the system stop button. The system vacuum pump starts to extract all the air from the warning airbag. When the pressure sensor detects that the pressure is lower than 0.1 bar, the recovery motor starts to recover the warning airbag into the warning airbag storage box inside the system.

[0066] Embodiment 2:

[0067] This embodiment provides a system for preventing and mitigating rear-end collisions of new energy vehicles, including the following components:

[0068] 1. Blower: Installed at the rear of the vehicle, used to blow air into the warning airbag. The maximum inflation pressure of the blower is 3 bar, and the inflation rate is 0.5 bar per second.

[0069] 2. Controller: The core component of the system, electrically connected to the vehicle's battery pack, responsible for coordinating the work of various components. The controller has a built-in microprocessor that can make corresponding decisions based on different sensor inputs.

[0070] 3. Air extractor: used to extract air from the warning airbag in the event of a secondary collision. The maximum air extraction rate of the air extractor is 0.2 bar per second.

[0071] 4. Recovery motor: used to recover the warning airbag when the system stops working. The power of the recovery motor is 50W, and it can complete the airbag recovery within 5 seconds.

[0072] 5. Warning airbag: Made of high-strength PVC material, it has a "earth" shape and its dimensions after deployment are 1.5m x 1.5m x 0.5m. A reflective warning sign is printed on the surface of the airbag.

[0073] 6. Warning airbag storage box: located between the rear anti-collision beam and the rear bumper skin, with dimensions of 40 cm × 30 cm × 20 cm.

[0074] 7. Pressure sensor: installed in the warning airbag, used to monitor the internal pressure of the airbag in real time, with a measurement range of 0-5bar and an accuracy of ±0.05bar.

[0075] 8. Collision sensor: installed at the front and rear of the vehicle to detect collision events and trigger system activation.

[0076] System workflow:

[0077] 1. When the collision sensor detects a collision signal or the driver manually starts the system, the controller activates the blower.

[0078] 2. The blower inflates the warning airbag until the pressure sensor shows that the pressure inside the airbag reaches 2.5 bar.

[0079] 3. If a secondary collision occurs, the pressure sensor detects a sudden increase in pressure and the controller immediately starts the vacuum pump.

[0080] 4. The vacuum pump reduces the warning airbag pressure at a linear rate according to the instructions of the controller until the pressure drops to 1 bar.

[0081] 5. After the accident is handled, the driver sends a stop signal through the button, the controller starts the vacuum pump to completely empty the warning airbag, and then starts the recovery motor to collect the airbag back into the storage box.

[0082] Through intelligent control and precise pressure management, the system can effectively prevent chain rear-end collisions and reduce the impact of secondary rear-end collisions. It is particularly suitable for new energy vehicles equipped with battery packs, greatly improving driving safety.

[0083] The warning airbag of the present invention can be made of rubber material, PVC material or high-strength fiber material, and is wear-resistant and explosion-resistant.

[0084] After the warning airbag of the present invention is deployed, Figure 4 As shown in 10 and 11, the inflated warning airbag has a stepped ring structure, which can cushion the impact of the vehicle.

[0085] After the warning airbag of the present invention is deployed, Figure 5 As shown in 12 and 13, the inflated warning airbag has a cube structure, and there is a warning mark on the rear surface of the warning airbag.

[0086] After the warning airbag of the present invention is deployed, Figure 6 As shown in 14 and 15, the inflated warning airbag has a soil-shaped structure, and after the warning airbag is deployed, both sides of the warning airbag can extend to both sides of the vehicle body to protect the safety of both sides of the vehicle body, and there is a warning mark on the rear surface of the warning airbag.

[0087] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A method for preventing and alleviating chain rear-end collisions of new energy vehicles, characterized in that: After the first rear-end collision occurs between vehicle A and vehicle B, the blower of vehicle B operates to blow air into the warning airbag located at the rear of the vehicle, and the warning airbag pops out to warn the normally moving vehicle C; when vehicle B is rear-ended by vehicle C, vehicle C hits the warning airbag, and the air pump of vehicle B operates, and the air pump controls the air in the warning airbag to be linearly drawn out according to the collision impulse.

2. The method for preventing and reducing chain rear-end collisions of new energy vehicles according to claim 1, characterized in that: After the first rear-end collision occurs between vehicle A and vehicle B, the blower of vehicle B is started based on the collision signal or actively started by the driver and passengers.

3. The method for preventing and alleviating chain rear-end collisions of new energy vehicles according to claim 1, characterized in that: The blower blows air into the warning airbag, and when the actual air pressure value of the warning airbag is equal to the preset air pressure value of the warning airbag, the blower stops inflating to keep the air pressure value of the warning airbag constant.

4. The method for preventing and reducing chain rear-end collisions of new energy vehicles according to claim 1, characterized in that: When the actual air pressure value of the warning airbag is greater than the preset air pressure value of the warning airbag, it means that vehicle B is rear-ended by vehicle C, and the air pump operates to draw out the air in the warning airbag, causing the air pressure in the warning airbag to linearly decrease.

5. The method for preventing and reducing chain rear-end collisions of new energy vehicles according to claim 1, characterized in that: The specific steps include: Step 1: After the first rear-end collision occurs between vehicle A and vehicle B, in vehicle B, the driver of vehicle B presses the button of the anti-consecutive rear-end collision and secondary rear-end collision mitigation system on the instrument panel, and the system is ready to start; Step 2: After the system receives the start signal, the blower operates to blow air into the warning airbag and pops the warning airbag out of the vehicle; Step 3: After the pressure in the warning airbag received by the pressure sensor of the system reaches the set value, the blower stops blowing air continuously and keeps the pressure of the warning airbag constant; Step 4: When vehicle C rear-ends vehicle B and vehicle C hits the warning airbag, when the pressure of the warning airbag exceeds the limit value of the pressure sensor, the air pump of the system starts to draw out some gas from the warning airbag to keep the pressure of the warning airbag linearly decreasing until the pressure of the warning airbag reaches the lower limit pressure value, and the air pump stops working and keeps the pressure of the warning airbag stable; Step 5: After the accident is handled, the driver of vehicle B presses the system stop working button, the air pump of the system starts to draw out all the air in the warning airbag, and when the pressure sensor reaches the set value, the recovery motor operates to recover the warning airbag into the system.

6. A system for preventing and mitigating rear-end collisions of new energy vehicles, characterized in that: It includes a blower, a controller, an air pump, a recovery motor, a warning airbag and a warning airbag storage box. The warning airbag storage box is arranged at the rear of the vehicle. The warning airbag and the recovery motor are arranged in the warning airbag storage box. The air inlet of the warning airbag is connected to the blower, the air outlet of the warning airbag is connected to the air pump, the controller is in communication connection with the blower, the air pump and the recovery motor, and the controller is electrically connected to the battery pack.

7. The system for preventing and alleviating rear-end collisions of new energy vehicles according to claim 1, characterized in that: The warning airbag is made of rubber material, PVC material or high-strength fiber material.

8. The system for preventing and alleviating rear-end collisions of new energy vehicles according to claim 1 is characterized in that: The warning airbag storage box is arranged between the rear bumper beam and the rear bumper skin, and an opening needs to be designed at the position of the rear bumper skin corresponding to the pop-out port of the warning airbag.

9. The system for preventing and alleviating rear-end collisions of new energy vehicles according to claim 1, characterized in that: The inflated warning airbag is in a stepped ring structure, a cube structure or a cross-shaped structure, and both sides of the warning airbag extend to both sides of the vehicle body, and warning signs are provided on the surface of the warning airbag.

10. A vehicle, comprising the system for preventing and alleviating chain rear-end collisions of new energy vehicles as claimed in any one of claims 6 to 9.

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