Road surface collapse identification and rapid disjunction integrated system

Abstract

The invention relates to a pavement collapse identification and rapid disjunction integrated system, and the system comprises a collapse identification module which is used for monitoring whether a target road segment collapses or not, and transmitting a collapse signal to a PLC control module; the blocking device is used for blocking the collapsed road section; and the PLC control module is used for controlling the opening of the blocking device. According to the invention, the normalized monitoring of the collapse and fracture of the road surface is realized, the collapse accident is quickly responded to realize the interruption and avoidance of the passing vehicle, and the time difference between the occurrence of the collapse and fracture accident of the road surface and the interruption of the passing of the vehicle is shortened. Meanwhile, intelligent control over the air bag is achieved according to the actual arrival condition of the vehicle, the response efficiency and the resource utilization rate of the system can be remarkably improved, it is ensured that the blocking device is accurately inflated for different vehicles, gas waste is effectively reduced, meanwhile, interference to vehicles of unrelated lanes is avoided, and the overall safety and adaptability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of road traffic safety facilities, and in particular to an integrated road collapse identification and rapid traffic disconnection system. Background Art

[0002] The causes of road collapse and fracture are complex. Fragile geological conditions, underground pipeline leakage, road construction damage and other factors are prone to cause accidents. Road collapse often occurs suddenly, and vehicles passing by have no time to quickly avoid danger, which leads to serious casualties and property losses. Therefore, monitoring road collapse and fracture and quickly blocking vehicles from passing through in a timely manner after an accident has become a technical problem that urgently needs to be solved.

[0003] In recent years, pavement condition monitoring technology has developed from traditional manual inspection and semi-automatic inspection to current non-destructive automatic inspection. Non-destructive automatic inspection technology is fast and intelligent. It is usually integrated in a multi-functional road inspection vehicle and can simultaneously detect multiple indicators such as pavement damage, flatness, rutting, anti-skid performance and structural strength; digital image detection technology and laser displacement sensing technology are used to achieve rapid detection of pavement cracks and flatness. However, these technologies mostly rely on manual inspections or periodic machine inspections, focusing on pavement maintenance, timely prevention and control of damage, and improving the durability and service life of roads. They cannot achieve normalized real-time monitoring of pavement collapse, especially after an accident. How to quickly block passing vehicles and prevent them from continuing to drive to the accident section is an urgent problem that needs to be solved.

[0004] Traditional collapse detection systems are mostly based on simple physical barriers or warning signs, lack intelligent control, and cannot effectively block vehicles according to their actual operating status. In addition, existing systems lack real-time monitoring and intelligent dynamic response functions, which can easily lead to system failure or resource waste due to misjudgment.

[0005] Therefore, it is of great significance to develop a system that integrates road collapse detection, vehicle identification, and intelligent control of airbag inflation, which can significantly improve accident warning and blocking capabilities. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide an intelligent airbag control system based on road collapse detection and vehicle identification. The system detects road collapse in real time, identifies oncoming vehicle information, and accurately controls the inflation of split airbags, thereby preventing vehicles from entering dangerous areas and effectively reducing the risk of accidents.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] An integrated road collapse identification and rapid disconnection system, comprising: a collapse identification module, a blocking device, and a PLC control module;

[0009] The collapse identification module is used to monitor whether the target road section collapses and transmit the collapse signal to the PLC control module;

[0010] The blocking device is used to block the collapsed road section;

[0011] The PLC control module is used to control the opening of the blocking device.

[0012] Optionally, the collapse identification module includes: a DC power supply, a detection wire, a resistor R1, an operational amplifier, a resistor R3, a capacitor C1 and a MOS tube Q1;

[0013] The detection wire is used to sense whether the road surface has collapsed. The detection wire is buried under the road surface of the target road section and close to the center line of the lane;

[0014] One end of the DC power supply and the detection wire are both grounded, the positive electrode of the DC power supply is connected to one end of the resistor R1, the other end of the resistor R1 and the detection wire is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to the reference voltage, the output end of the operational amplifier is connected to one end of the resistor R3, the other end of the resistor R3 and one end of the capacitor C1 are connected to the gate of the MOS tube Q1, the other end of the capacitor C1 and the drain of the MOS tube Q1 are grounded, and the source of the MOS tube Q1 is connected to the PLC module through a signal output interface.

[0015] Optionally, the blocking device includes: a control box, a solenoid valve, a high-pressure gas cylinder, a gas cylinder fixing bracket, an air bag assembly, a joint, an inflation pipeline, an ejector, a one-way valve, a buffer box, an overpressure protection valve, a gas source pipeline, a connection port, and a pipeline fixing plate;

[0016] The control box is arranged on the road side, and an opening is provided at the upper end of the control box near the road side, and the size of the opening needs to ensure that the airbag assembly can be ejected;

[0017] The airbag group is arranged on the upper part of the control box and faces the opening of the control box; when the road surface does not collapse, the airbag group is in a compressed state and is stored in the control box as a whole; after collapse, the airbag group is inflated and pops out from the control box;

[0018] The high-pressure gas cylinder is used to inflate the airbag assembly, and the high-pressure gas cylinder is placed at the bottom of the control box and fixed by a gas cylinder fixing bracket;

[0019] One end of the inflation pipe is sealed and connected to the gas outlet of the high-pressure gas cylinder through the joint, and the other end of the inflation pipe is sealed and connected to the nozzle of the ejector;

[0020] The ejector and the one-way valve are arranged at the connection between the inflation pipe and the buffer box; the ejector accelerates the gas flow by using the Venturi effect, the one-way valve is used to control the external air to flow into the airbag group, and the buffer box is located at the outlet of the ejector so as to realize flow diversion for different inflation amounts of different airbags; the buffer box and the gas source pipe are connected through the connecting port, and the whole is fixed in the control box through the pipe fixing plate;

[0021] The overpressure protection valve is installed at the inlet of the buffer tank;

[0022] The solenoid valve is arranged at the air outlet of the high-pressure gas cylinder and connected to the PLC control module, and is used to control the on and off of the high-pressure gas cylinder to inflate the airbag group as a whole; wherein, the solenoid valve is in a closed state when there is no road collapse, and is in an open state when collapse occurs.

[0023] Optionally, the airbag group includes a plurality of individual airbags, and each individual airbag is connected to the air source pipeline in sequence through a diversion hose, a buffer, an independent solenoid valve, and an inflation interface.

[0024] Optionally, airbag fixing parts are installed on one side of the control box facing the opening and on the airbag group, and the airbag fixing parts are used to fix the airbag group and the control box, and quickly disassemble and assemble them.

[0025] Optionally, a spring-loaded safety valve and a bursting disc are provided near the bottle mouth of the high-pressure gas cylinder;

[0026] Optionally, the system further comprises: a vehicle identification module and a status monitoring module;

[0027] The vehicle identification module and the status monitoring module are respectively connected to the PLC control module;

[0028] The vehicle identification module is used to monitor vehicle dynamic information;

[0029] The state monitoring module is used to detect the operating state of the system in real time, including the airbag inflation state, the solenoid valve working state, the gas cylinder pressure state and the system communication state, and provide alarm and feedback functions.

[0030] Optionally, the vehicle identification module includes: an image acquisition device, a vehicle detection device, a data processing unit and a communication unit;

[0031] The image acquisition device and the vehicle detection device are both attached to the control box, the image acquisition device is used to acquire the vehicle appearance image, and the vehicle detection device is used to detect the real-time position, speed and distance of the vehicle;

[0032] The data processing unit is used to analyze the data collected by the image acquisition device and the vehicle detection device to obtain key vehicle parameters; wherein the key vehicle parameters include: vehicle speed, lane, vehicle model and license plate information;

[0033] The communication unit is used to transmit the key parameters of the vehicle to the PLC control module.

[0034] Optionally, the state monitoring module includes: an air pressure sensor, a flow sensor, a pressure switch sensor and a position sensor;

[0035] The air pressure sensor is installed near the air inlet of each airbag and is used to monitor the inflation pressure in real time;

[0036] The flow sensor is installed at the connection between the main inflation pipe and the branch pipe, and is used to detect the rate at which the gas flows through the inflation pipe;

[0037] The pressure switch sensor is installed on the outlet of the high-pressure gas cylinder and is used to monitor the pressure inside the high-pressure gas cylinder in real time;

[0038] The position sensor is installed near the moving parts of each solenoid valve and is used to detect the working state of the solenoid valve in real time.

[0039] Optionally, the PLC control module includes: an input interface unit, a central processing unit, an output interface unit and a communication interface unit;

[0040] The input interface unit is used to receive the collapse signal output by the collapse recognition module and the output signal of the vehicle recognition module;

[0041] The central processing unit is used to perform comprehensive analysis on the incoming data through preset control logic; and determine the position of the airbag to be inflated, the amount of inflation, and the switch state of the solenoid valve according to the analysis results;

[0042] The output interface unit is used to control the solenoid valve required for airbag inflation, and start or close the corresponding solenoid valve according to the control logic;

[0043] The communication interface unit is used to support data communication among the collapse identification module, the blocking device, the vehicle identification module, and the status monitoring module.

[0044] Optionally, the preset control logic in the central processing unit includes:

[0045] In the set time interval t0 to t0+δ after receiving the road fracture signal, if no vehicle passes through the upstream section, the airbag group is inflated according to the preset minimum inflation volume, can be deployed normally and can maintain an upright working state after being deployed; where t0 is the time when the road collapse signal appears, and δ is the maximum time required for the vehicle identification module to obtain information;

[0046] In the set time interval t0 to t0+δ after receiving the road fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l>l t At this time, the inflation strategy of the airbag group adopts the intelligent blocking mode, which is adjusted according to the speed and lane of the vehicle. The split airbag of the lane corresponding to the vehicle is used as the force airbag, and different inflation controls are performed according to different vehicle models; Among them, s t is the braking distance of the vehicle, l is the safe distance between the vehicle and the blocking device, l t is the distance between the vehicle and the detection device;

[0047] In the set time interval t0 to t0+δ after receiving the road fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l≤l t ; The airbag group is inflated according to the preset maximum inflation volume.

[0048] The beneficial effects of the present invention are:

[0049] The present invention integrates the functions of road collapse and fracture detection and rapid blocking of passing vehicles. The road collapse and fracture are sensed by the detection wire buried under the road surface. When the collapse identification circuit detects the road collapse and fracture, the solenoid valve is controlled to open and the airbag is inflated, so that the airbag pops out from the control box and forms a blocking barrier upstream of the collapsed section, blocking the passing vehicles from continuing to drive to the collapsed section, thereby preventing secondary accidents. The system realizes the normalized monitoring of road collapse and fracture, and at the same time quickly responds to collapse accidents to interrupt and avoid passing vehicles, shortening the time difference between the occurrence of road collapse and fracture accidents and the interruption of vehicle traffic. At the same time, the intelligent control of the airbag is realized according to the actual arrival of the vehicle, which can significantly improve the response efficiency and resource utilization of the system, ensure that the blocking device is accurately inflated for different vehicles, effectively reduce gas waste, and avoid interference with vehicles in irrelevant lanes, thereby improving overall safety and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A cross-sectional view of the patent blocking device according to an embodiment of the present invention;

[0052] Figure 2 A road collapse detection circuit diagram according to an embodiment of the present invention;

[0053] Figure 3 is a system module diagram of an embodiment of the present invention;

[0054] Figure 4 It is a flowchart of an implementation scenario of an embodiment of the present invention;

[0055] Figure 5 It is a schematic diagram of the appearance of an implementation scenario of an embodiment of the present invention;

[0056] Figure 6 A schematic diagram of the arrangement of a split airbag according to an embodiment of the present invention;

[0057] Figure 7 A control logic diagram of a central processing unit according to an embodiment of the present invention;

[0058] Among them, 1. Solenoid valve; 2. High-pressure gas cylinder; 3. Gas cylinder fixing bracket; 4. Spring-loaded safety valve; 5. Bursting disc; 6. Airbag assembly (including single airbags 601, 602, 603, 604, 605); 7. Airbag fixing part 1; 8. Airbag fixing part 2; 9. Connector; 10. Inflating pipeline; 11. Ejector; 12. One-way valve; 13. Buffer box; 14. Overpressure protection valve; 15. Gas source pipeline; 16. Connector; 17. Inflating interface group (1701, 1702, 1 703, 1704, 1705); 18. Solenoid valve group (1801, 1802, 1803, 1804, 1805); 19. Buffer group (1901, 1902, 1903, 1904, 1905); 20. Diverter hose group (2001, 2002, 2003, 2004, 2005); 21. Control box 21; 22. High-definition camera; 23. LiDAR sensor; 24. Pipe fixing plate; 25. Connecting rod; 26. Power supply system. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the 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.

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] This embodiment provides an integrated road collapse identification and rapid disconnection system, characterized in that it includes: a collapse identification module, a blocking device, and a PLC control module;

[0062] A collapse identification module is used to monitor whether a target road section has collapsed and transmit the collapse signal to the PLC control module;

[0063] A blocking device is used to block the collapsed road section;

[0064] The PLC control module is used to control the opening of the blocking device.

[0065] Furthermore, the collapse identification module includes: a DC power supply, a detection wire, a resistor R1, an operational amplifier, a resistor R3, a capacitor C1 and a MOS tube Q1;

[0066] The detection wire is used to sense whether the road surface has collapsed. The detection wire is buried under the road surface of the target section and close to the center line of the lane;

[0067] One end of the DC power supply and the detection wire are both grounded, the positive electrode of the DC power supply is connected to one end of the resistor R1, the other end of the resistor R1 and the detection wire is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to the reference voltage, the output end of the operational amplifier is connected to one end of the resistor R3, the other end of the resistor R3 and one end of the capacitor C1 are connected to the gate of the MOS tube Q1, the other end of the capacitor C1 and the drain of the MOS tube Q1 are grounded, and the source of the MOS tube Q1 is connected to the PLC module through a signal output interface.

[0068] Furthermore, in this embodiment, if Figure 2As shown, the collapse identification circuit includes a direct current power supply (DC), a detection wire, a resistor R1, an operational amplifier, a resistor R3, a capacitor C1 and a MOS tube Q1; the detection wire is buried 4-5mm below the road surface of the target section, close to the center line of the lane, to minimize the impact caused by vehicle rolling vibration. The detection wire is equivalent to a resistor R2 in the circuit; the negative electrode of the DC power supply and one end of the resistor R2 are both grounded, the positive electrode of the DC power supply is connected to one end of the resistor R1, the other ends of the resistors R1 and R2 are connected to the positive input end of the operational amplifier, the inverting input end of the operational amplifier is connected to the reference voltage, the output end of the operational amplifier is connected to one end of the resistor R3, the other end of the resistor R3 and one end of the capacitor C1 are connected to the gate of the MOS tube Q1, the other end of the capacitor C1 and the drain of the MOS tube Q1 are grounded, and the source of the MOS tube Q1 is connected to the PLC module through a signal output interface.

[0069] The detection wire is used to sense whether the road surface has collapsed. It is made of materials with low tensile strength and ductility to ensure that the road surface collapse can cause it to break and improve the sensitivity of detection. Resistors R1 and R2 are connected in series to form a voltage divider network. When the resistance value of resistor R1 is large enough (at least 100 times that of resistor R2), it can ensure that the current output by the DC power supply is almost zero when the detection wire is intact; the operational amplifier monitors the voltage at the voltage divider point. When the detection wire is broken and the voltage at the voltage divider point (the connection point of resistors R1, R2 and the operational amplifier) ​​rises to a certain threshold, the output flips; the output signal of the operational amplifier is delayed by resistor R3 and capacitor C1. The delay time is set according to actual needs to avoid misjudgment. After the delay is completed, the MOS tube Q1 is driven to turn on, and the level state is sent to the input end of the PLC module through the signal interface.

[0070] Furthermore, the blocking device includes: a control box, a solenoid valve, a high-pressure gas cylinder, a gas cylinder fixing bracket, an air bag assembly, a joint, an inflation pipeline, an ejector, a one-way valve, a buffer box, an overpressure protection valve, a gas source pipeline, a connection port, and a pipeline fixing plate;

[0071] The control box is arranged on the road side, and an opening is provided at the upper end of the control box near the road side, and the size of the opening needs to ensure that the airbag assembly can be ejected;

[0072] The airbag group is arranged on the upper part of the control box and is directly opposite to the opening of the control box; when the road surface has not collapsed, the airbag group is in a compressed state and is stored in the control box as a whole; after collapse, the airbag group is inflated and popped out of the control box;

[0073] A high-pressure gas cylinder is used to inflate the airbag assembly. The high-pressure gas cylinder is placed at the bottom of the control box and fixed by a gas cylinder fixing bracket;

[0074] One end of the inflation pipe is sealed and connected to the gas outlet of the high-pressure gas cylinder through a joint, and the other end of the inflation pipe is sealed and connected to the nozzle of the ejector;

[0075] The ejector and the one-way valve are arranged at the connection between the inflation pipe and the buffer box; the ejector accelerates the gas flow by using the Venturi effect, the one-way valve is used to control the external air to flow into the airbag group, and the buffer box is located at the outlet of the ejector so as to realize the flow diversion for different inflation amounts of different airbags; the buffer box and the gas source pipe are connected through the connection port, and the whole is fixed in the control box through the pipe fixing plate;

[0076] The solenoid valve is arranged at the air outlet of the high-pressure gas cylinder and is connected to the PLC control module to control the on and off of the high-pressure gas cylinder to inflate the airbag group as a whole; wherein, the solenoid valve is in a closed state when there is no road collapse, and in an open state when collapse occurs.

[0077] Furthermore, the airbag group includes a plurality of individual airbags, and each individual airbag is connected to the air source pipeline in sequence through a diversion hose, a buffer, an independent solenoid valve, and an inflation interface.

[0078] Furthermore, airbag fixing parts are installed on one side of the control box facing the opening and on the airbag assembly, and the airbag fixing parts are used to fix the airbag assembly and the control box, as well as to quickly disassemble and assemble them.

[0079] Furthermore, a spring-loaded safety valve and a bursting disc are provided near the bottle mouth of the high-pressure gas cylinder.

[0080] Specifically, in this embodiment, Figure 1 As shown, the blocking device includes a solenoid valve 1; a high-pressure gas cylinder 2; a gas cylinder fixing bracket 3; a spring-loaded safety valve 4; a bursting disc 5; an airbag group 6 (including single airbags 601, 602, 603, 604, and 605); an airbag fixing part 1 7; an airbag fixing part 2 8; a joint 9; an inflation pipeline 10; an ejector 11; a one-way valve 12; a buffer box 13; an overpressure protection valve 14; an air source pipeline 15; a connecting port 16; and an inflation interface group 17 (1701, 1702, and 1703). , 1704, 1705); solenoid valve group 18 (1801, 1802, 1803, 1804, 1805); buffer group 19 (1901, 1902, 1903, 1904, 1905); diverter hose group 20 (2001, 2002, 2003, 2004, 2005); control box 21; high-definition camera 22; lidar sensor 23; pipeline fixing plate 24; connecting rod 25; power supply system 26 and collapse identification circuit.

[0081] Among them, the control box 21 is arranged on the road side, and an opening is provided at the upper end of the control box 21 near the road side, and the size of the opening needs to ensure that the airbag group 6 can be smoothly ejected after inflation; the high-pressure gas cylinder 2 is placed in the control box 21 and fixed by the gas cylinder fixing bracket 3; the airbag group 6 is installed on the upper part of the control box 21 and is directly opposite to the opening of the control box 21. When the road surface has not collapsed, the airbag group 6 is in a compressed state and is stored in the control box 21 as a whole. After collapse, it is quickly inflated and ejected from the control box 21; one end of the inflation pipe 10 is sealed and connected to the air outlet of the high-pressure gas cylinder 2 through the joint 9, and the other end of the inflation pipe 10 is sealed and connected to the nozzle of the ejector 11; the solenoid valve 1 is arranged at the air outlet of the high-pressure gas cylinder 2, and is connected to the collapse recognition In a separate circuit, it is used to control the on and off of the overall inflation of the airbag group 6 by the high-pressure gas cylinder 2. The solenoid valve 1 is in a closed state when the road surface has not collapsed, and is in an open state when a collapse occurs; the ejector 11 and the one-way valve 12 are arranged at the connection between the inflation pipe 10 and the buffer box 13, and the two are used in conjunction with each other. The ejector 11 utilizes the Venturi effect to accelerate the gas flow, and the one-way valve 12 is used to control the external air to flow into the airbag group 6 to ensure that the airbag group 6 can be quickly inflated and maintained in an inflated state. The buffer box 13 is located at the outlet of the ejector 11 to achieve diversion of different inflation amounts of different airbags; the buffer box 13 and the gas source pipe 15 are connected through the connecting port 16, and are fixed as a whole in the control box 21 through the pipe fixing plate 24. The collapse identification circuit is used for road collapse identification. When road collapse is identified, the solenoid valve 1 is controlled to open, and the single airbag of the airbag group 6 is quickly inflated through the high-pressure gas cylinder 2, the inflation pipe 10, the buffer box 13, the gas source pipe 15, and the diversion hose group, so that the airbag group 6 pops out from the control box 21 to block road traffic.

[0082] The gas in the high-pressure gas cylinder 2 first enters the buffer box 13 through the inflation pipe 10 , and then is transported to the airbag assembly 6 through the gas source pipe 15 .

[0083] The airbag group 6 is composed of single airbags 601, 602, 603, 604, and 605, which are connected to the gas source pipeline 15 through separate inflation interfaces 1701, 1702, 1703, 1704, and 1705 in turn, and inflation is controlled by solenoid valves 1801, 1802, 1803, 1804, and 1805 respectively. The inflation volume of the single airbags is independently controlled by the corresponding solenoid valves but they are tightly connected to ensure that a continuous and stable blocking barrier is formed after inflation.

[0084] Airbag group inflation and blocking, when the control unit confirms that a vehicle is about to pass through a lane, the relevant airbags are quickly inflated. The inflation time of each airbag should be controlled within a few seconds to ensure that the blocking barrier can be formed quickly. The airbag design should have sufficient strength to withstand the impact of high-speed vehicles and form a stable blocking barrier after inflation.

[0085] The distance between the control box 21 and the road is 10cm-20cm, and it is located about 30cm upstream of the target section. It is necessary to ensure that after the airbag group 6 is inflated and popped out, a blocking barrier located upstream of the collapsed section is formed to prevent vehicles from continuing to drive towards the collapsed section. A detachable movable baffle is provided on the far side of the control box 21 to facilitate the installation, inspection, replacement and maintenance of the equipment in the control box 21. An airbag fixing part 2 8 is provided on the side of the control box 21 facing the opening, and an airbag fixing part 1 7 is installed on the airbag group 6. The airbag group 6 and the control box 21 are fixed by snapping the airbag fixing part 1 7 with the airbag fixing part 2 8. The snapping also facilitates the rapid disassembly and assembly of the airbag group 6.

[0086] A spring-loaded safety valve 4 and a bursting disc 5 are provided near the mouth of the high-pressure gas cylinder 2 to prevent equipment damage or accidents caused by excessive pressure.

[0087] Furthermore, the system also includes: a vehicle identification module and a status monitoring module;

[0088] The vehicle identification module and the status monitoring module are respectively connected to the PLC control module;

[0089] Vehicle identification module, used to monitor vehicle dynamic information;

[0090] The status monitoring module is used to detect the operating status of the system in real time, including the airbag inflation status, the solenoid valve working status, the cylinder pressure status and the system communication status, and provide alarm and feedback functions.

[0091] Further, the vehicle identification module includes: an image acquisition device, a vehicle detection device, a data processing unit and a communication unit;

[0092] The image acquisition device and the vehicle detection device are both attached to the control box. The image acquisition device is used to acquire the vehicle appearance image, and the vehicle detection device is used to detect the real-time position, speed and distance of the vehicle.

[0093] A data processing unit is used to analyze the data collected by the image acquisition device and the vehicle detection device to obtain key vehicle parameters; wherein the key vehicle parameters include: vehicle speed, lane, vehicle model and license plate information;

[0094] The communication unit is used to transmit key vehicle parameters to the PLC control module.

[0095] Further, the state monitoring module includes: an air pressure sensor, a flow sensor, a pressure switch sensor and a position sensor;

[0096] Air pressure sensor, installed near the air inlet of each airbag, used to monitor the inflation pressure in real time;

[0097] A flow sensor is installed at the connection between the main inflation pipe and the branch pipe to detect the rate at which the gas flows through the inflation pipe;

[0098] The pressure switch sensor is installed on the outlet of the high-pressure gas cylinder to monitor the pressure inside the high-pressure gas cylinder in real time;

[0099] The position sensor is installed near the moving parts of each solenoid valve and is used to detect the working status of the solenoid valve in real time.

[0100] Further, the PLC control module includes: an input interface unit, a central processing unit, an output interface unit and a communication interface unit;

[0101] An input interface unit, used for receiving the collapse signal output by the collapse recognition module and the output signal of the vehicle recognition module;

[0102] The central processing unit is used to comprehensively analyze the incoming data through preset control logic; according to the analysis results, the position of the airbag to be inflated, the amount of inflation, and the switch state of the solenoid valve are determined;

[0103] The output interface unit is used to control the solenoid valve required for airbag inflation, and start or close the corresponding solenoid valve according to the control logic;

[0104] The communication interface unit is used to support data communication between the collapse identification module, the blocking device, the vehicle identification module, and the status monitoring module.

[0105] Furthermore, the preset control logic in the central processing unit includes:

[0106] In the set time interval t0 to t0+δ after receiving the road fracture signal, if no vehicle passes through the upstream section, the airbag group is inflated according to the preset minimum inflation volume, can be deployed normally and can maintain an upright working state after being deployed; where t0 is the time when the road collapse signal appears, and δ is the maximum time required for the vehicle identification module to obtain information;

[0107] In the set time interval t0 to t0+δ after receiving the road fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l>l tAt this time, the inflation strategy of the airbag group adopts the intelligent blocking mode, which is adjusted according to the speed and lane of the vehicle. The split airbag of the lane corresponding to the vehicle is used as the force airbag, and different inflation controls are performed according to different vehicle models; Among them, s t is the braking distance of the vehicle, l is the safe distance between the vehicle and the blocking device, l t is the distance between the vehicle and the detection device;

[0108] In the set time interval t0 to t0+δ after receiving the road surface fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l≤l t ; The airbag group is inflated according to the preset maximum inflation volume.

[0109] Specifically, in this embodiment, Figure 3 As shown, the system also includes a vehicle identification module, a PLC control module, a status monitoring module, a data transmission module, a communication management module and an intelligent monitoring terminal.

[0110] The vehicle identification module is the core unit in the system for monitoring vehicle dynamic information and providing key parameters to the intelligent airbag control system. The module consists of a high-definition camera, a laser radar (or infrared sensor), a data processing unit, and a communication interface. The high-definition camera and the laser radar (or infrared sensor) are attached to the control box together. If the detection section (point) itself is already equipped with a camera or a laser radar and can meet the needs here, the original camera or sensor can be borrowed. The viewing angle should be able to cover all lanes in the detection direction, and is used to collect vehicle appearance images, vehicle information, and the position of the vehicle in the lane. The equipment needs to support high-resolution video acquisition, automatic optical zoom, and night imaging capabilities to ensure all-weather operation. The laser radar detects the real-time position, speed, and distance of the vehicle by emitting laser or infrared signals, and constructs the three-dimensional contour information of the vehicle. It has high ranging accuracy and is suitable for high-speed vehicles and complex environments.

[0111] The data processing unit includes an embedded processor, built-in memory and data analysis algorithm module. It receives data collected by the camera and laser radar, processes and analyzes the vehicle information in combination with the multi-sensor fusion algorithm, and outputs the key parameters of the vehicle (vehicle speed, lane, vehicle model and license plate information). The communication interface should be a high-speed interface that supports RS485, CAN bus or Ethernet, and is responsible for transmitting the data processed by the vehicle identification module to the system control center (PLC) in real time. The workflow is divided into four steps: data acquisition, data preprocessing, multi-sensor fusion and data transmission. 1. Data acquisition uses a high-definition camera to collect images of the vehicle shape and license plate, and the laser radar obtains the vehicle's speed, size and distance information in real time. 2. Homogeneous data preprocessing denoises the camera's image data, extracts edge, color and shape features, filters and models the laser radar's point cloud data, and forms vehicle three-dimensional information. 3. Multi-sensor fusion uses the Kalman filter algorithm to calibrate the image information of the camera and the point cloud data of the laser radar in time and space; uses a deep learning model to further analyze the fused data and output the comprehensive parameters of the vehicle, including speed, lane position, vehicle model classification and license plate number. Data transmission is to send the recognition results to PLC in the form of structured data, including lane number, vehicle speed, vehicle model and other information; PLC controls the inflation strategy of the intelligent airbag system based on the received data.

[0112] The PLC control module is the core control unit of the system. It is used to receive data transmitted by the vehicle identification module and the road collapse detection module, and control the inflation start and stop operation of the airbag after comprehensive analysis. The composition and functions of the PLC module include: (1) Input interface module: used to receive signals from the road collapse detection module to determine whether the road has collapsed; receive output data from the vehicle identification module, including vehicle speed, lane position, and vehicle model. (2) Central processing unit (CPU): responsible for data integration and logic processing, and conducts comprehensive analysis of the incoming data through preset control logic; determines the position of the airbag to be inflated, the inflation volume, and the switch status of the solenoid valve based on the analysis results. (3) Output interface module: controls the solenoid valve required for airbag inflation, accurately starts or closes the corresponding solenoid valve according to the control logic; outputs status signals to the intelligent monitoring terminal for real-time feedback of the airbag working status. (4) Communication interface: supports two-way data communication with the vehicle identification module and other control units, using common industrial communication protocols (such as Modbus, CAN bus or Ethernet).

[0113] Specifically, Figure 7 As shown, the PLC control module sets three states for the opening of the airbag according to the possible vehicle arrival conditions. The following is the detailed naming and control logic:

[0114] Assume that the collapse / fracture signal appears at t0, and set the time interval (t0,, t0+δ,), where δ is the maximum time required for the vehicle identification module to obtain information. i , detect the vehicle closest to the collapse / fracture point (segment) on the upstream road segment i , the speed is v0, and the distance between the vehicle and the detection device is l t

[0115] The vehicle at time t s , start taking braking measures, t s , the braking acceleration at the moment is a t ,, braking is completed at time T, if the braking distance of the vehicle is s t ,, the instantaneous speed of the vehicle during braking is v t , then the braking distance of the vehicle can be expressed as However, in the process of the blocking system, the first thing to do is to activate the airbag (that is, open the inflation system to allow other gases to enter), so it is impossible to wait until the vehicle brakes and then follow the formula , so the braking distance is expressed as The safe distance between the vehicle and the blocking device is l.

[0116] Basic mode: within the set time interval (t0,,t0+δ) after receiving the road surface fracture signal, if no vehicle passes through the upstream section, the airbag will be inflated according to the minimum inflation volume C0, and can be ejected normally and can maintain an upright working state after ejection, playing a basic warning function. At the same time, since the alarm module has been activated, an alarm message is sent to the intelligent control terminal to prompt the staff to take appropriate measures to intervene in time. Before manual intervention, the vehicle detection module continuously monitors the status of vehicles upstream of the road. If a vehicle appears, it determines whether it is necessary to switch to the intelligent adjustment mode or the full-power mode based on relevant parameters.

[0117] Intelligent adjustment mode: Within the set time interval (t0, t0+δ,) when the road surface fracture signal is received, there are vehicles passing by, but the number is small and the speed is slow. After measurement, s t +l>l t At this time, the airbag inflation strategy adopts the intelligent blocking mode, and makes appropriate adjustments according to the vehicle's speed and lane, taking refined control. Taking a two-way four-lane vehicle as an example, the detection range is two lanes in one direction, such as Figure 6The split airbags shown should be set to 5, and the 5 single airbags are numbered ①, ②, ③, ④, and ⑤ in sequence from the end close to the air source. Assuming that the lane closest to the edge of the roadside lane is the first lane, when only a vehicle is detected on the first lane, the split airbags ①, ②, and ③ are used as force-bearing airbags. The next step is to perform inflation control according to the vehicle model. When a small passenger car appears, the inflation volume is When a large truck or bus appears, the maximum inflation volume C is used. max ,,Separate airbags ④ and ⑤ serve as support airbags to maintain basic functions, and their inflation volume is C0.

[0118] Full-force mode: Within the set time interval (t0,,t0+δ) after receiving the road surface fracture signal, there are vehicles passing through both lanes or any lane, and the speed is fast and predicted, s t +l≤l t When the airbag is max , inflate it to ensure that it plays its maximum role in blocking road traffic, blocking traffic before rescue workers arrive, and avoiding or reducing personal and property losses caused by secondary accidents.

[0119] The status monitoring module is used to detect the operating status of the system in real time, including the airbag inflation status, the solenoid valve working status, the cylinder pressure status and the system communication status, and provide alarm and feedback functions. The components and functions of this module include: (1) Sensor unit: air pressure sensor, using Honeywell MPR series or Bosch BMP388, installed near the air inlet of each airbag, at the shunt interface connected to the inflation hose, and the wiring uses high-voltage shielded cables. It is used to monitor the inflation pressure in real time to ensure that the inflation meets the preset value; flow sensor, using Honeywell Zephyr series or Dwyer RMC series, installed at the connection between the main inflation pipeline and the branch pipeline, and the wiring uses high-voltage shielded cables. It is used to monitor the flow of gas from the pressure buffer container to the shunt interface, detect the rate of gas flowing through the inflation pipeline, and ensure stable gas supply. Pressure switch sensor, using Schneider XML series or SMC ISE series, is directly installed on the outlet of the high-pressure gas cylinder or the nearby pipeline, and is connected to the acquisition module with a high-pressure connector. It is used to monitor the pressure in the gas cylinder in real time and indicate whether the cylinder pressure is at a safe threshold. Position sensor, using Omron E2E series proximity switch sensor or IFM Efector series, is installed near the moving parts of each solenoid valve, protected by a protective cover from external interference, and used to provide real-time feedback on the working status of the solenoid valve. Detect whether the solenoid valve is in the open or closed state, detect the switch state of the solenoid valve, and confirm whether it is executed according to the PLC instruction.

[0120] Data transmission module The data transmission module is one of the core components of this system, which is used to realize efficient data interaction and logical coordination between various functional modules. It transfers the data generated by the road collapse detection module, vehicle identification module and status monitoring module to the PLC module to complete data collection, transmission and processing. The road collapse detection module determines whether a collapse occurs by detecting the wire break signal. After the detection signal is delayed by the circuit, it is output by the MOS tube as a high and low level signal and transmitted to the digital input end of the PLC module. The vehicle identification module uses a camera, lidar or infrared sensor to obtain vehicle information in real time, and extracts the vehicle's speed, model, lane and other parameters through the data processing unit. The processed data is transmitted through a serial communication protocol (such as UART, CAN or I 2 C) Transmitted to the communication interface of the PLC module. The status monitoring module collects data such as cylinder pressure, airbag pressure and airflow rate through sensors, and after A / D conversion, transmits the digital signal to the monitoring port of the PLC module.

[0121] The communication management module is the core part of data processing and feedback in the system. It is responsible for coordinating the operation logic of the entire system and realizing remote monitoring and control through communication with external devices. The communication management module realizes two-way interaction with external devices through wireless or wired communication for real-time monitoring and system management.

[0122] The intelligent monitoring terminal is used to receive accident alarm information and abnormal internal pressure of high-pressure gas cylinders. Accident alarm information facilitates the staff to take the next step in time when the road collapses, and abnormal internal pressure of high-pressure gas cylinders facilitates timely detection and handling of abnormal situations, and maintains the stable operation of equipment and systems. At the same time, the intelligent monitoring terminal should reserve a video data transmission interface, and in key monitoring sections where surveillance cameras are deployed, the uploaded accident alarm information and video data will be combined to facilitate the staff to make a more accurate judgment on the accident situation.

[0123] The wireless communication module can use Wi-Fi, Bluetooth, NB-IoT or LoRaWan, etc. The application scenario of this embodiment is road and bridge fracture detection. There are two types of signals transmitted to the terminal, namely, a road fracture signal triggered when the wire is broken and an abnormal pressure signal when the pressure of the high-pressure gas cylinder is reduced. According to the triggering of these two signals, there are 4 states, including two abnormal working states; as shown in Table 1 below.

[0124] Table 1

[0125] Road break signal Abnormal air pressure signal Working status none none Normal untouched state none trigger Abnormal air pressure in the bottle trigger none Abnormal wire damage or road damage Airbag deployment abnormality trigger trigger Road rupture airbags deploy normally

[0126] Taking the case where a road rupture signal is triggered and there is no abnormal air pressure signal as an example, the working principle and workflow of the patent of this invention are as follows:

[0127] When a collapse accident occurs in the target road section, the detection wire breaks along with the road surface, causing the resistor R2 of the collapse identification circuit to be turned on, and the MOS tube Q1 is turned on. The source of the MOS tube Q1 is connected to the PLC module through a signal output interface. The high-pressure gas in the high-pressure gas cylinder 2 enters the inflation pipe 10 through the ejector 11, and the buffer box is rapidly inflated under the action of the Venturi effect. At the same time, it is transmitted to the inflation interface group 17 of the airbag group 6 through the gas source pipe 15. Under the control of the pre-set solenoid valve group 18, the single airbags 601, 602, 603, 604, and 605 are inflated through the diversion hose group 20. The air pressure sensor in the buffer box 13 monitors the internal pressure of the airbag and uploads the pressure data to the PLC. When the internal pressure of the airbag reaches the preset threshold, the solenoid valve 1 is closed and the inflation stops; the ejected airbag group 6 forms an obstruction barrier upstream of the collapsed road section, thereby blocking the vehicle from continuing to drive to the collapsed road section. At the same time, alarm information such as road cracks and collapses is uploaded to the intelligent monitoring terminal through the remote signal sending module, prompting the staff to confirm in time and mobilize relevant resources to intervene and deal with the subsequent accidents.

[0128] Figure 4 This is a flowchart for the system implementation scenario. Figure 5 This is the appearance diagram of the implementation scenario.

[0129] The flow sensor is installed in the inflation pipeline between the gas cylinder and the buffer box, and is connected to the status monitoring module to detect whether the gas flow is stable; if the gas flow is abnormal, the system sends an alarm signal through the PLC module and stops the inflation operation. The air pressure sensor is respectively set at the outlet of the high-pressure gas cylinder and the air inlet of each airbag. The air pressure sensor is used to detect the internal pressure of the high-pressure gas cylinder in real time, and the air pressure data is uploaded to the PLC. The PLC determines whether the air pressure data is within the normal range. If the air pressure data is abnormal, the abnormal data is uploaded to the intelligent monitoring terminal through the data transmission module to prompt the staff to check and replace it. The air pressure sensor at the airbag inlet is used to detect the current pressure of the airbag to ensure that the inflation reaches the preset target; if the air pressure is insufficient or too high, the system adjusts the opening and closing state of the solenoid valve through the PLC module to increase or stop the gas supply. The position sensor is installed on the solenoid valve that controls the inflation of each airbag, and is connected to the PLC module to detect whether the opening state of the solenoid valve is normal; if it is detected that the solenoid valve is not opened or closed correctly, the system will issue a fault alarm or readjust the working state of the solenoid valve through the PLC module to ensure that the system operates as expected.

[0130] For internal pressure detection of high-pressure gas cylinders, use a smart gas cylinder wireless pressure sensor, such as FST100-1105-LN, which can send gas cylinder pressure data to the smart monitoring terminal via wireless transmission and push alarm information when a gas cylinder leaks.

[0131] This embodiment integrates the functions of road collapse and fracture detection and rapid blocking of passing vehicles. The detection wire buried under the road surface senses road collapse and fracture. When the collapse identification circuit detects road collapse and fracture, the solenoid valve is controlled to open and the airbag is inflated, so that the airbag pops out from the control box and forms a blocking barrier upstream of the collapsed section, blocking passing vehicles from continuing to drive to the collapsed section, thereby preventing secondary accidents. The system realizes the normalized monitoring of road collapse and fracture, and responds quickly to collapse accidents to interrupt and avoid passing vehicles, shortening the time difference between the occurrence of road collapse and fracture accidents and the interruption of vehicle traffic. At the same time, the intelligent control of the airbag according to the actual arrival of the vehicle can significantly improve the response efficiency and resource utilization of the system, ensure that the blocking device is accurately inflated for different vehicles, effectively reduce gas waste, and avoid interference with vehicles in irrelevant lanes, thereby improving overall safety and adaptability.

[0132] Accident information is sent to the intelligent monitoring terminal in a timely manner through the remote signal sending module, achieving rapid response and safety warning for road collapse accidents, and improving the intelligence and data management capabilities of the system.

[0133] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A road collapse identification and rapid disconnection integrated system, characterized in that: include: Collapse identification module, blocking device, PLC control module; The collapse identification module is used to monitor whether the target road section collapses and transmit the collapse signal to the PLC control module; The blocking device is used to block the collapsed road section; The PLC control module is used to control the opening of the blocking device.

2. The integrated road collapse identification and rapid disconnection system according to claim 1 is characterized in that: The collapse identification module includes: a DC power supply, a detection wire, a resistor R1, an operational amplifier, a resistor R3, a capacitor C1 and a MOS tube Q1; The detection wire is used to sense whether the road surface has collapsed. The detection wire is buried under the road surface of the target road section and close to the center line of the lane; One end of the DC power supply and the detection wire are both grounded, the positive electrode of the DC power supply is connected to one end of the resistor R1, the other end of the resistor R1 and the detection wire is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to the reference voltage, the output end of the operational amplifier is connected to one end of the resistor R3, the other end of the resistor R3 and one end of the capacitor C1 are connected to the gate of the MOS tube Q1, the other end of the capacitor C1 and the drain of the MOS tube Q1 are grounded, and the source of the MOS tube Q1 is connected to the PLC module through a signal output interface.

3. The integrated road collapse identification and rapid disconnection system according to claim 1 is characterized in that: The blocking device includes: a control box, a solenoid valve, a high-pressure gas cylinder, a gas cylinder fixing bracket, an air bag assembly, a joint, an inflation pipeline, an ejector, a one-way valve, a buffer box, an overpressure protection valve, a gas source pipeline, a connection port, and a pipeline fixing plate; The control box is arranged on the road side, and an opening is provided at the upper end of the control box near the road side, and the size of the opening needs to ensure that the airbag assembly can be ejected; The airbag group is arranged on the upper part of the control box and faces the opening of the control box; when the road surface does not collapse, the airbag group is in a compressed state and is stored in the control box as a whole; after collapse, the airbag group is inflated and pops out from the control box; The high-pressure gas cylinder is used to inflate the airbag assembly, and the high-pressure gas cylinder is placed at the bottom of the control box and fixed by a gas cylinder fixing bracket; One end of the inflation pipe is sealed and connected to the gas outlet of the high-pressure gas cylinder through the joint, and the other end of the inflation pipe is sealed and connected to the nozzle of the ejector; The ejector and the one-way valve are arranged at the connection between the inflation pipe and the buffer box; the ejector accelerates the gas flow by using the Venturi effect, the one-way valve is used to control the external air to flow into the airbag group, and the buffer box is located at the outlet of the ejector so as to realize flow diversion for different inflation amounts of different airbags; the buffer box and the gas source pipe are connected through the connecting port, and the whole is fixed in the control box through the pipe fixing plate; The overpressure protection valve is installed at the inlet of the buffer tank; The solenoid valve is arranged at the air outlet of the high-pressure gas cylinder and connected to the PLC control module, and is used to control the on and off of the high-pressure gas cylinder to inflate the airbag group as a whole; wherein, the solenoid valve is in a closed state when there is no road collapse, and is in an open state when collapse occurs.

4. The integrated road collapse identification and rapid disconnection system according to claim 3 is characterized in that: The airbag group includes a plurality of single airbags, and each single airbag is connected to the air source pipeline in sequence through a diversion hose, a buffer, an independent solenoid valve, and an inflation interface.

5. The integrated road collapse identification and rapid disconnection system according to claim 3 is characterized in that: An airbag fixing part is installed on one side of the control box facing the opening and on the airbag group. The airbag fixing part is used to fix the airbag group and the control box, and to quickly disassemble and assemble them.

6. The integrated road collapse identification and rapid disconnection system according to claim 3 is characterized in that: A spring-loaded safety valve and a bursting disc are provided near the bottle mouth of the high-pressure gas cylinder.

7. The integrated road collapse identification and rapid disconnection system according to claim 3 is characterized in that: The system also includes: a vehicle identification module and a status monitoring module; The vehicle identification module and the status monitoring module are respectively connected to the PLC control module; The vehicle identification module is used to monitor vehicle dynamic information; The state monitoring module is used to detect the operating state of the system in real time, including the airbag inflation state, the solenoid valve working state, the gas cylinder pressure state and the system communication state, and provide alarm and feedback functions.

8. The integrated road collapse identification and rapid disconnection system according to claim 7 is characterized in that: The vehicle identification module includes: an image acquisition device, a vehicle detection device, a data processing unit and a communication unit; The image acquisition device and the vehicle detection device are both attached to the control box, the image acquisition device is used to acquire the vehicle appearance image, and the vehicle detection device is used to detect the real-time position, speed and distance of the vehicle; The data processing unit is used to analyze the data collected by the image acquisition device and the vehicle detection device to obtain key vehicle parameters; wherein the key vehicle parameters include: vehicle speed, lane, vehicle model and license plate information; The communication unit is used to transmit the key parameters of the vehicle to the PLC control module; The state monitoring module includes: an air pressure sensor, a flow sensor, a pressure switch sensor and a position sensor; The air pressure sensor is installed near the air inlet of each airbag and is used to monitor the inflation pressure in real time; The flow sensor is installed at the connection between the main inflation pipe and the branch pipe, and is used to detect the rate at which the gas flows through the inflation pipe; The pressure switch sensor is installed on the outlet of the high-pressure gas cylinder and is used to monitor the pressure inside the high-pressure gas cylinder in real time; The position sensor is installed near the moving parts of each solenoid valve and is used to detect the working state of the solenoid valve in real time.

9. The integrated road collapse identification and rapid disconnection system according to claim 7, characterized in that: The PLC control module includes: an input interface unit, a central processing unit, an output interface unit and a communication interface unit; The input interface unit is used to receive the collapse signal output by the collapse recognition module and the output signal of the vehicle recognition module; The central processing unit is used to perform comprehensive analysis on the incoming data through preset control logic; and determine the position of the airbag to be inflated, the amount of inflation, and the switch state of the solenoid valve according to the analysis results; The output interface unit is used to control the solenoid valve required for airbag inflation, and start or close the corresponding solenoid valve according to the control logic; The communication interface unit is used to support data communication among the collapse identification module, the blocking device, the vehicle identification module, and the status monitoring module.

10. The integrated road collapse identification and rapid disconnection system according to claim 9, characterized in that: The preset control logic in the central processing unit includes: In the set time interval t0 to t0+δ after receiving the road fracture signal, if no vehicle passes through the upstream section, the airbag group is inflated according to the preset minimum inflation volume, can be deployed normally and can maintain an upright working state after being deployed; where t0 is the time when the road collapse signal appears, and δ is the maximum time required for the vehicle identification module to obtain information; In the set time interval t0 to t0+δ after receiving the road surface fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l>l t At this time, the inflation strategy of the airbag group adopts the intelligent blocking mode, which is adjusted according to the speed and lane of the vehicle. The split airbag of the lane corresponding to the vehicle is used as the force airbag, and different inflation controls are performed according to different vehicle models; Among them, s t is the braking distance of the vehicle, l is the safe distance between the vehicle and the blocking device, l t is the distance between the vehicle and the detection device; In the set time interval t0 to t0+δ after receiving the road surface fracture signal, a vehicle is detected passing through the upstream section, and the vehicle satisfies s t +l≤l t ; The airbag group is inflated according to the preset maximum inflation volume.

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