CN110080136B - Intelligent vehicle rollover protection system and control method thereof - Google Patents
Intelligent vehicle rollover protection system and control method thereof Download PDFInfo
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- CN110080136B CN110080136B CN201910343147.3A CN201910343147A CN110080136B CN 110080136 B CN110080136 B CN 110080136B CN 201910343147 A CN201910343147 A CN 201910343147A CN 110080136 B CN110080136 B CN 110080136B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/30—Arrangements interacting with transmitters or receivers otherwise than by visible means, e.g. using radar reflectors or radio transmitters
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Abstract
The invention discloses a vehicle rollover intelligent protection system and a control method thereof, wherein the vehicle rollover intelligent protection system comprises a judging module and a protection unit; the judging module comprises a sensor unit, a first controller and a signal transmitter; the sensor unit comprises a level meter and a gyroscope; the protection unit comprises a signal receiver, a second controller, a stand column, an inclined strut, a cross beam, a buffer device, a first bearing, a second bearing and an adjusting column; the adjusting column comprises a push rod, a cylinder and a power gas generating unit; the air bag unit comprises an air bag braid, an air bag gas generator and a plastic sheet; the first controller is electrically connected with the level meter, the gyroscope and the signal emitter respectively; the second controller is electrically connected with the signal receiver, the power gas generating unit and the gas generator respectively. The invention has simple structure, can realize the communication between the vehicle and the guardrail through the Internet of things, adjusts the gesture of the guardrail at the position where the guardrail possibly collides, opens the buffer air bag, and reduces the impact on the vehicle.
Description
Technical Field
The invention relates to the field of vehicle safety, in particular to a vehicle rollover protective guard and a control method thereof.
Background
With the rapid development of the automobile industry and national economy, the automobile conservation in China has been in the front of the world. Especially domestic SUVs, buses and trucks have become the main transportation means of road transportation in China, but passengers or cargoes in the types of vehicles are more, the mass and the volume are larger, and the mass center is higher, so compared with a small-sized vehicle, the vehicle has poor stability and can cause serious consequences such as group death group injury, environmental pollution and the like once rollover occurs. The guardrail is an effective protection measure for effectively buffering and blocking the rollover of the vehicle, and can prevent the vehicle from further rollover and injuring surrounding vehicles and personnel.
To solve the above problems, many and varied highway guardrails have appeared on the market. The invention such as Yang Guang discloses a highway guardrail structure (application number 201811015191.3), which can effectively absorb energy when collision occurs through a spring between an upper beam and a lower beam, and reduce the injury of passengers. However, the invention is sized to accommodate only a frontal or side impact of a small vehicle, such as a large passenger car or truck rollover, rather than a frontal impact of the guardrail, the impact is from obliquely above the guardrail. At this time, the upright post of the guardrail can be contacted with the vehicle body firstly, so that the local area of the vehicle body is greatly damaged, even the upright post invades the inside of the vehicle body, and the upright post directly causes great damage to passengers.
The invention relates to a highway guardrail (application number 201810826222.7) which is invented by building moon, and is characterized in that a buffer cushion and a sliding mechanism are arranged to relieve the collision between a vehicle at a low speed and the guardrail, and meanwhile, a driver can be reminded to perform related operations, so that the driver can avoid further collision. However, the invention can only play a role in relieving collision and reminding for vehicles running at low speed, and because the buffer function of the guardrail buffer pad is limited, the vehicle collides with the guardrail when running at high speed, the absorbed energy is less in proportion of the total collision energy, and other collision relieving effects are difficult. Meanwhile, in a high-speed driving state, the guardrail cannot remind a driver.
Wang Benxun A smart guardrail based on the Internet of things technology (application number 201810035532.7) is characterized in that a plurality of bearings are arranged on the outer side of a guardrail, so that when a vehicle collides with the guardrail, the vehicle body can roll on the guardrail through the bearings, and the deformation of the vehicle body during collision is reduced. Meanwhile, after the guardrail senses collision, nearby traffic police departments can be automatically warned through the Internet of things. However, the invention has complex structure, higher cost and higher installation difficulty, and when collision occurs, the control system is easily damaged and can not send out an alarm signal.
In summary, most of the prior guardrails only consider the front collision and side collision of small vehicles, and have no guardrails which can face different vehicle types at the same time and have good protection effect under different collision working conditions. Because mass centers of buses, trucks and the like are higher, the mass is larger, when rollover occurs, the top of the existing guardrail is always contacted with the vehicle body, so that the protection effect cannot be achieved, and the deformation of the vehicle body can be increased.
Disclosure of Invention
Aiming at the defects related to the background technology, the invention provides the vehicle rollover protective fence and the control method thereof, and the vehicle and the guardrail can communicate through the technology of the Internet of things, so that the guardrail can adjust different postures according to the size of a vehicle model, the collision contact surface is larger, and the overlarge deformation of a local vehicle body is avoided. Meanwhile, the air bag module is arranged, the air bag can be opened according to signals sent by the vehicle, a buffer effect is achieved, and damage is reduced.
The invention adopts the following technical scheme for solving the technical problems:
a vehicle rollover intelligent protection system and a control method thereof comprise a judging module and a protection module;
the judging module is arranged on the vehicle and comprises a level meter, a gyroscope, a storage unit, a first controller and a signal transmitter;
the level gauge and the gyroscope are arranged at the mass center of the vehicle and are used for detecting the side-tipping angle of the vehicle body of the passenger car and transmitting the detected side-tipping angle of the vehicle body to the first controller;
the signal transmitter is arranged at the axis of the front cross beam of the vehicle and is used for sending an alarm signal to the protection unit in the working range of the signal transmitter;
the storage unit is used for storing the vehicle type size information of the vehicle, wherein the vehicle type size information is a small-sized vehicle, a medium-sized vehicle or a large-sized vehicle;
the first controller is respectively and electrically connected with the level meter, the gyroscope, the storage unit and the signal emitter, and is used for judging whether the vehicle body turns over or not according to sensing signals of the level meter sensor and the gyroscope sensor, and if the vehicle body turns over, the control signal emitter emits an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
the protection module comprises a plurality of protection units which are arranged at the place where the road needs to be protected, wherein each protection unit comprises a signal receiver, a second controller, an upright post, an inclined strut, a cross beam, an adjusting post and a buffer device;
the upright post is vertically fixed on the ground; the inclined struts and the cross beams are respectively arranged on two sides of the stand column, the adjusting column and the cross beams are positioned on the same side of the stand column, one end of the inclined struts is fixedly connected with the stand column, the other end of the inclined struts is fixedly connected with the ground, so that right-angled triangles are formed among the stand column, the inclined struts and the ground, and the right-angled triangles are used for enhancing the anti-damage capability of the stand column; one end of the cross beam is vertically and fixedly connected with the upright post, and the other end of the cross beam is hinged with the buffer device; the adjusting column is arranged below the cross beam, one end of the adjusting column is fixedly connected with the upright post, the other end of the adjusting column is hinged with the buffer device, and the hinged position of the adjusting column and the buffer device is higher than the joint of the adjusting column and the upright post;
the adjusting column comprises a cylinder and first to third power gas generators; the cylinder adopts a single-acting cylinder, a cylinder barrel of the single-acting cylinder is fixedly connected with the upright post, and a piston rod of the single-acting cylinder is hinged with the buffer device; the first power gas generator, the second power gas generator and the third power gas generator are arranged on the bottom wall of the cylinder barrel, and the clamping rings used for preventing the cylinder piston from pressing the first power gas generator, the second power gas generator and the third power gas generator are arranged on the inner wall of the cylinder barrel; the first to third power gas generators are used for igniting according to the instruction of the second controller, releasing gas to push the piston rod of the cylinder to move outwards, and further pushing the buffer device to lift;
the buffer device comprises a shell, an air bag gas generator, an air bag braid and a plastic sheet; the shell is a hollow cylinder with one end open and the other end closed; the plastic sheet is fixedly connected with the opening end of the shell and matched with the shell to form a closed cavity; the air bag gas generator and the air bag mesh belt are arranged in a cavity formed by the plastic sheet and the shell, and the air bag gas generator is used for releasing gas according to the instruction of the second controller to inflate the air bag mesh belt, so that the air bag mesh belt is inflated to break the plastic sheet; the closed end of the shell is hinged with the cross beam and the adjusting column respectively;
the signal receiver is used for receiving the alarm signal sent by the signal transmitter and transmitting the received alarm signal to the second controller;
the second controller is electrically connected with the signal receiver, the first power gas generator, the second power gas generator, the third power gas generator and the air bag gas generator respectively and is used for controlling the first power gas generator, the third power gas generator and the air bag gas generator to work according to the alarm signals received by the signal receiver.
As a further optimization scheme of the intelligent vehicle rollover protection system, the working range of the signal transmitter is 3-5 meters.
As a further optimization scheme of the intelligent vehicle rollover protection system, when the first power gas generator, the second power gas generator and the third power gas generator do not work, the plane where the closed end of the buffer device shell is located is parallel to the axis of the upright post.
The invention also discloses a control method of the vehicle rollover intelligent protection system, which comprises the following steps:
step 1), a level sensor and a gyroscope sensor respectively acquire a body roll angle signal of a vehicle and transmit the body roll angle signal to a first controller;
step 2), the control module adopts Kalman filtering to carry out information mixing on the signals of the body roll angles acquired by the gyroscope sensor and the level meter sensor, the mixed body roll angles are obtained, and whether the body is turned over or not is judged through the mixed body roll angles;
step 3), if the vehicle is judged to be turned over, the first controller controls the signal transmitter to transmit an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
step 4), each protection unit in the working range of the signal generator receives the alarm signal and outputs the alarm signal to the second controller of the signal generator, and for each protection unit:
step 4.1), if the vehicle type size information is a small vehicle, the second controller controls the first power gas generator to ignite;
if the vehicle type information is medium-sized, the second controller controls the first power gas generator and the second power gas generator to ignite;
if the vehicle type information is large-sized vehicle, the second controller controls the first, second and third power gas generators to ignite;
step 4.2), the piston of the air cylinder slides, so that the piston rod of the air cylinder pushes the buffer device to rotate around one end of the cross beam far away from the upright post;
and 4.3), the second controller controls the ignition of the air bag gas generator, and releases gas to inflate the air bag webbing, so that the air bag webbing is inflated to break the plastic sheet, and the impact of the vehicle is buffered.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. simple structure, small occupied space and convenient installation and maintenance.
2. The intelligent is higher, and the information of the vehicle side turning and the vehicle type can be timely obtained through the communication technology of the internet of things of the vehicle, so that different measures can be taken according to different situations.
3. The flexibility is higher, and the guardrail can carry out the control of three kinds of angles to buffer, corresponds different motorcycle types, adopts different angles, makes the contact surface of vehicle and guardrail bigger, avoids local regional too big deformation to produce.
4. The buffer effect is strong, and the guardrail is provided with the gasbag, opens the gasbag according to the signal that the vehicle sent, because of the vehicle has initial velocity, takes place the in-process that turns on one's side still can follow the axial and move to open the gasbag along the way, play the buffer effect to bigger automobile body area.
Drawings
FIG. 1 is a schematic illustration of the present invention with the guard unit unopened;
FIG. 2 is a schematic view of the present invention with the guard unit open;
FIG. 3 is a schematic view of the structure of the adjusting column of the present invention;
FIG. 4 is a schematic view of a buffer device according to the present invention;
FIG. 5 is a schematic illustration of the communication between a vehicle module and various protection units of the present invention;
FIG. 6 is a schematic diagram of the effect of the present invention;
FIG. 7 is a control flow diagram of the present invention;
in the figure, a 1-upright post, a 2-diagonal brace, a 3-cross beam, a 4-buffer device, a 5-adjusting column, a 6-cylinder piston, a 7-cylinder piston rod, an 8-snap ring, a 9-first power gas generator, a 10-second power gas generator, a 11-third power gas generator, a 12-shell, a 13-air bag gas generator, a 14-plastic plate and a 15-air bag braid are arranged.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:
this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the components are exaggerated for clarity.
The invention discloses a vehicle rollover intelligent protection system and a control method thereof, wherein the system comprises a judging module and a protection module;
the judging module is arranged on the vehicle and comprises a level meter, a gyroscope, a storage unit, a first controller and a signal transmitter;
the level gauge and the gyroscope are arranged at the mass center of the vehicle and are used for detecting the side-tipping angle of the vehicle body of the passenger car and transmitting the detected side-tipping angle of the vehicle body to the first controller;
the signal transmitter is arranged at the axis of the front cross beam of the vehicle and is used for sending an alarm signal to the protection unit in the working range of the signal transmitter;
the storage unit is used for storing the vehicle type size information of the vehicle, wherein the vehicle type size information is a small-sized vehicle, a medium-sized vehicle or a large-sized vehicle;
the first controller is respectively and electrically connected with the level meter, the gyroscope, the storage unit and the signal emitter, and is used for judging whether the vehicle body turns over or not according to sensing signals of the level meter sensor and the gyroscope sensor, and if the vehicle body turns over, the control signal emitter emits an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
the protection module comprises a plurality of protection units which are arranged at the place where the road needs to be protected, and as shown in fig. 1 and 2, the protection units comprise a signal receiver, a second controller, an upright post, an inclined strut, a cross beam, an adjusting post and a buffer device;
the upright post is vertically fixed on the ground; the inclined struts and the cross beams are respectively arranged on two sides of the stand column, the adjusting column and the cross beams are positioned on the same side of the stand column, one end of the inclined struts is fixedly connected with the stand column, the other end of the inclined struts is fixedly connected with the ground, so that right-angled triangles are formed among the stand column, the inclined struts and the ground, and the right-angled triangles are used for enhancing the anti-damage capability of the stand column; one end of the cross beam is vertically and fixedly connected with the upright post, and the other end of the cross beam is hinged with the buffer device; the adjusting column is arranged below the cross beam, one end of the adjusting column is fixedly connected with the upright post, the other end of the adjusting column is hinged with the buffer device, and the hinged position of the adjusting column and the buffer device is higher than the joint of the adjusting column and the upright post;
as shown in fig. 3, the adjusting column includes a cylinder, and first to third power gas generators; the cylinder adopts a single-acting cylinder, a cylinder barrel of the single-acting cylinder is fixedly connected with the upright post, and a piston rod of the single-acting cylinder is hinged with the buffer device; the first power gas generator, the second power gas generator and the third power gas generator are arranged on the bottom wall of the cylinder barrel, and the clamping rings used for preventing the cylinder piston from pressing the first power gas generator, the second power gas generator and the third power gas generator are arranged on the inner wall of the cylinder barrel; the first to third power gas generators are used for igniting according to the instruction of the second controller, releasing gas to push the piston rod of the cylinder to move outwards, and further pushing the buffer device to lift;
as shown in fig. 4, the cushioning device comprises a housing, an airbag gas generator, an airbag webbing, and a plastic sheet; the shell is a hollow cylinder with one end open and the other end closed; the plastic sheet is fixedly connected with the opening end of the shell and matched with the shell to form a closed cavity; the air bag gas generator and the air bag mesh belt are arranged in a cavity formed by the plastic sheet and the shell, and the air bag gas generator is used for releasing gas according to the instruction of the second controller to inflate the air bag mesh belt, so that the air bag mesh belt is inflated to break the plastic sheet; the closed end of the shell is hinged with the cross beam and the adjusting column respectively;
the signal receiver is used for receiving the alarm signal sent by the signal transmitter and transmitting the received alarm signal to the second controller;
the second controller is electrically connected with the signal receiver, the first power gas generator, the second power gas generator, the third power gas generator and the air bag gas generator respectively and is used for controlling the first power gas generator, the third power gas generator and the air bag gas generator to work according to the alarm signals received by the signal receiver.
The working range of the signal transmitter is 3-5 meters. The plane of the closed end of the buffer device shell is parallel to the axis of the upright post when the first to third power gas generators are not in operation.
The number of the first to third power generators can be one, two or three, so that the piston has three levels of extension length, and the buffer device can be lifted up by three angles.
As shown in fig. 7, the invention also discloses a control method of the vehicle rollover intelligent protection system, which comprises the following steps:
step 1), a level sensor and a gyroscope sensor respectively acquire a body roll angle signal of a vehicle and transmit the body roll angle signal to a first controller;
step 2), the control module adopts Kalman filtering to carry out information mixing on the signals of the body roll angles acquired by the gyroscope sensor and the level meter sensor, the mixed body roll angles are obtained, and whether the body is turned over or not is judged through the mixed body roll angles;
step 3), if the vehicle is judged to be turned over, the first controller controls the signal transmitter to transmit an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
step 4), each protection unit in the working range of the signal generator receives the alarm signal and outputs the alarm signal to the second controller thereof, and for each protection unit, as shown in fig. 5:
step 4.1), if the vehicle type size information is a small vehicle, the second controller controls the first power gas generator to ignite;
if the vehicle type information is medium-sized, the second controller controls the first power gas generator and the second power gas generator to ignite;
if the vehicle type information is large-sized vehicle, the second controller controls the first, second and third power gas generators to ignite;
step 4.2), the piston of the air cylinder slides, so that the piston rod of the air cylinder pushes the buffer device to rotate around one end of the cross beam far away from the upright post;
step 4.3), the second controller controls the air bag gas generator to ignite, and releases gas to inflate the air bag webbing, so that the air bag webbing expands to break the plastic sheet, and the impact of the vehicle is buffered, as shown in fig. 6.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (4)
1. The intelligent vehicle rollover protection system is characterized by comprising a judging module and a protection module;
the judging module is arranged on the vehicle and comprises a level meter, a gyroscope, a storage unit, a first controller and a signal transmitter;
the level gauge and the gyroscope are arranged at the mass center of the vehicle and are used for detecting the side-tipping angle of the vehicle body of the passenger car and transmitting the detected side-tipping angle of the vehicle body to the first controller;
the signal transmitter is arranged at the axis of the front cross beam of the vehicle and is used for sending an alarm signal to the protection unit in the working range of the signal transmitter;
the storage unit is used for storing the vehicle type size information of the vehicle, wherein the vehicle type size information is a small-sized vehicle, a medium-sized vehicle or a large-sized vehicle;
the first controller is respectively and electrically connected with the level meter, the gyroscope, the storage unit and the signal emitter, and is used for judging whether the vehicle body turns over or not according to sensing signals of the level meter sensor and the gyroscope sensor, and if the vehicle body turns over, the control signal emitter emits an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
the protection module comprises a plurality of protection units which are arranged at the place where the road needs to be protected, wherein each protection unit comprises a signal receiver, a second controller, an upright post, an inclined strut, a cross beam, an adjusting post and a buffer device;
the upright post is vertically fixed on the ground; the inclined struts and the cross beams are respectively arranged on two sides of the stand column, the adjusting column and the cross beams are positioned on the same side of the stand column, one end of the inclined struts is fixedly connected with the stand column, the other end of the inclined struts is fixedly connected with the ground, so that right-angled triangles are formed among the stand column, the inclined struts and the ground, and the right-angled triangles are used for enhancing the anti-damage capability of the stand column; one end of the cross beam is vertically and fixedly connected with the upright post, and the other end of the cross beam is hinged with the buffer device; the adjusting column is arranged below the cross beam, one end of the adjusting column is fixedly connected with the upright post, the other end of the adjusting column is hinged with the buffer device, and the hinged position of the adjusting column and the buffer device is higher than the connecting position of the adjusting column and the upright post;
the adjusting column comprises a cylinder and first to third power gas generators; the cylinder adopts a single-acting cylinder, a cylinder barrel of the single-acting cylinder is fixedly connected with the upright post, and a piston rod of the single-acting cylinder is hinged with the buffer device; the first power gas generator, the second power gas generator and the third power gas generator are arranged on the bottom wall of the cylinder barrel, and the clamping rings used for preventing the cylinder piston from pressing the first power gas generator, the second power gas generator and the third power gas generator are arranged on the inner wall of the cylinder barrel; the first to third power gas generators are used for igniting according to the instruction of the second controller, releasing gas to push the piston rod of the cylinder to move outwards, and further pushing the buffer device to lift;
the buffer device comprises a shell, an air bag gas generator, an air bag braid and a plastic sheet; the shell is a hollow cylinder with one end open and the other end closed; the plastic sheet is fixedly connected with the opening end of the shell and matched with the shell to form a closed cavity; the air bag gas generator and the air bag mesh belt are arranged in a cavity formed by the plastic sheet and the shell, and the air bag gas generator is used for releasing gas according to the instruction of the second controller to inflate the air bag mesh belt, so that the air bag mesh belt is inflated to break the plastic sheet; the closed end of the shell is hinged with the cross beam and the adjusting column respectively;
the signal receiver is used for receiving the alarm signal sent by the signal transmitter and transmitting the received alarm signal to the second controller;
the second controller is electrically connected with the signal receiver, the first power gas generator, the second power gas generator, the third power gas generator and the air bag gas generator respectively and is used for controlling the first power gas generator, the third power gas generator and the air bag gas generator to work according to the alarm signals received by the signal receiver.
2. The intelligent vehicle rollover protection system according to claim 1, wherein the working range of the signal transmitter is 3-5 meters.
3. The intelligent vehicle rollover protection system according to claim 1, wherein the plane of the closed end of the buffer device housing and the axis of the upright are parallel when the first through third power gas generators are not in operation.
4. The control method based on the vehicle rollover intelligent protection system as set forth in claim 1, comprising the steps of:
step 1), a level sensor and a gyroscope sensor respectively acquire a body roll angle signal of a vehicle and transmit the body roll angle signal to a first controller;
step 2), the control module adopts Kalman filtering to carry out information mixing on the signals of the body roll angles acquired by the gyroscope sensor and the level meter sensor, the mixed body roll angles are obtained, and whether the body is turned over or not is judged through the mixed body roll angles;
step 3), if the vehicle is judged to be turned over, the first controller controls the signal transmitter to transmit an alarm signal, wherein the alarm signal comprises vehicle type size information and collision early warning information;
step 4), each protection unit in the working range of the signal generator receives the alarm signal and outputs the alarm signal to the second controller of the signal generator, and for each protection unit:
step 4.1), if the vehicle type size information is a small vehicle, the second controller controls the first power gas generator to ignite;
if the vehicle type information is medium-sized, the second controller controls the first power gas generator and the second power gas generator to ignite;
if the vehicle type information is large-sized vehicle, the second controller controls the first, second and third power gas generators to ignite;
step 4.2), the piston of the air cylinder slides, so that the piston rod of the air cylinder pushes the buffer device to rotate around one end of the cross beam far away from the upright post;
and 4.3), the second controller controls the ignition of the air bag gas generator, and releases gas to inflate the air bag webbing, so that the air bag webbing is inflated to break the plastic sheet, and the impact of the vehicle is buffered.
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| JP7313276B2 (en) * | 2019-12-26 | 2023-07-24 | 株式会社ダイセル | protective body |
| CN112681189A (en) * | 2020-12-15 | 2021-04-20 | 刘天宝 | Anti-crossing safety road guard rail |
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