CN114049777A - Tunnel vehicle driving early warning device and method based on distributed optical fiber sensing - Google Patents
Tunnel vehicle driving early warning device and method based on distributed optical fiber sensing Download PDFInfo
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- CN114049777A CN114049777A CN202111145933.6A CN202111145933A CN114049777A CN 114049777 A CN114049777 A CN 114049777A CN 202111145933 A CN202111145933 A CN 202111145933A CN 114049777 A CN114049777 A CN 114049777A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a road tunnel vehicle driving early warning device and a method based on distributed optical fiber sensing.A license plate recognition system locks and marks vehicles driving into a tunnel to realize the dynamic monitoring of the whole process of the vehicle tunnel, an optical fiber data acquisition system, an optical transceiver, an optical fiber and a data switch mainly finish the acquisition of real-time optical fiber data, the driving state of the vehicle is restored with high precision according to the acquired associated data information, a storage server carries out targeted storage on the real-time acquired data according to the acquisition precision and the identification event type, and road tunnel vehicle driving early warning equipment mainly carries out early warning in time on abnormal conditions of the vehicle in the driving process of the tunnel. The invention has the advantages of simple structure, low cost, high efficiency, stable performance and no blind area, realizes the full coverage of intelligent monitoring of the running state of the tunnel vehicle, analyzes the vehicle state and ensures that the early warning system has stronger reliability.
Description
Technical Field
The invention relates to the technical field of tunnel traffic, in particular to a tunnel vehicle driving early warning device and method based on distributed optical fiber sensing.
Background
With the high-speed development of highway construction in China, the number of tunnels in the highway is also rapidly advanced, the tunnels are used as a special structure, which plays a great promoting role in the development of traffic industry in China, and the great environmental difference is generated between the interior of a tunnel body and the outside due to the particularity of 'mountain crossing and mountain crossing', the information mainly comprises illumination, visibility, traffic flow and the like, and the difference is larger as the length of the tunnel is longer, in order to ensure that various environment, road surface condition and accident information in the tunnel can be timely fed back to a vehicle driver and a tunnel management station, a safety early warning system is formed by arranging acquisition instruments such as an information board, a vehicle detector, a high-definition camera, a video event detector and the like in the tunnel, the information in the tunnel can be timely collected and published through various collection devices, and the safety of tunnel driving is greatly improved.
A safety early warning system composed of data acquisition equipment such as an information board, a vehicle detector, a high-definition camera, a video event detector and the like arranged in a tunnel at present has many problems in the operation and management process, mainly embodied in the aspects of complex system structure, poor linkage performance, acquisition blind areas, high cost and the like, and the vehicle detector is generally arranged at the entrance and exit of the tunnel and cannot judge the actual vehicle running track in the tunnel; the video event detector is realized through a high-definition camera and a rear-end algorithm, but the coverage rate is insufficient, and the video event detector cannot work normally when the visibility of a tunnel is low; the information board is used as an information publishing device, and is mainly used for publishing the plan in time after acquiring the traffic condition, so that the tunnel passing efficiency and the tunnel passing safety are improved.
Disclosure of Invention
In order to solve the limitations and defects of the prior art, the invention provides a road tunnel vehicle driving early warning device based on distributed optical fiber sensing, which comprises a license plate recognition system, an optical fiber data acquisition system, an optical transmitter and receiver, optical fibers, a data exchanger, a storage server and road tunnel vehicle driving early warning equipment, wherein the license plate recognition system is arranged at the entrance of a tunnel, the optical fiber data acquisition system is arranged at the entrance of the tunnel, and the optical fibers are laid on the road surface in the tunnel according to the arrangement mode of a preset rule;
the license plate recognition system is used for locking and marking vehicles entering the tunnel, synchronously triggering tracking operation and realizing dynamic monitoring of the whole process of the vehicle tunnel;
the optical fiber is used for generating corresponding associated data information when a vehicle passes by, wherein the associated data information comprises stress, vibration, data generation time and data generation position;
the optical fiber data acquisition system is used for acquiring real-time optical fiber data, and the real-time optical fiber data comprises associated data information;
the optical transceiver is used for transmitting the real-time optical fiber data to the data switch;
the data switch is used for enabling the associated data information in the real-time optical fiber data to correspond to an early warning scene through data scene fitting, restoring the running state of the vehicle and finally restoring the dynamic track of the vehicle in the tunnel, wherein the early warning scene comprises the running speed of the vehicle, the running track of the vehicle, lane changing, line pressing, tunnel blockage and traffic accidents in the vehicle tunnel;
the storage server is used for storing real-time optical fiber data and storing the real-time optical fiber data in a targeted manner according to preset acquisition precision and identification event types;
the highway tunnel vehicle driving early warning device is used for setting corresponding threshold values in advance according to various scene plans, and when abnormal conditions of vehicles in the tunnel driving process exceed the corresponding threshold values, early warning actions are triggered.
Optionally, the optical fiber includes a multimode sensing optical fiber and a data transmission optical fiber, and the multimode sensing optical fiber arranged at the tunnel entrance, the tunnel exit and the road surface in the tunnel are provided with high-precision fiber grating sensors at intervals of 200 m.
Optionally, the multimode sensing fiber L1The multimode sensing optical fiber is arranged in a lane in a tunnel, the multimode sensing optical fiber comprises vertical optical fibers and parallel optical fibers which are alternately arranged at intervals, the vertical optical fibers are vertical to the tunnel direction, the parallel optical fibers are parallel to the tunnel direction, the lengths of all sections of the vertical optical fibers are equal, and the lengths of all sections of the vertical optical fibers are lane widthsLmThe lengths of the parallel optical fibers are equal and are 10 m.
Optionally, the multimode sensing fiber L2The multimode sensing optical fiber is arranged in a lane in a tunnel, the multimode sensing optical fiber comprises vertical optical fibers and parallel optical fibers which are alternately arranged at intervals, the vertical optical fibers are vertical to the tunnel direction, the parallel optical fibers are parallel to the tunnel direction, the lengths of all sections of the vertical optical fibers are equal, and the lengths of all sections of the vertical optical fibers are lane widths LmThe lengths of the parallel optical fibers are equal and are 10 m.
Optionally, when the length of the tunnel is greater than 3km, the number of the optical fiber data acquisition systems and the number of the optical fibers are increased according to a preset ratio.
The invention also provides a road tunnel vehicle running early warning method based on distributed optical fiber sensing, which uses the road tunnel vehicle running early warning device and comprises the following steps:
the method comprises the following steps that dynamic intelligent monitoring is carried out on vehicles running in a tunnel in the whole process, the vehicles entering the tunnel are all independent early warning threads, and when the vehicles enter the tunnel, the license plate recognition system and the optical fiber data acquisition system carry out uniqueness locking and marking on the vehicles through license plate information and strain value information;
the method comprises the steps that multimode sensing optical fibers and data transmission optical fibers which are distributed in a tunnel according to an identification area are used for collecting driving information of a marked vehicle entering the tunnel in real time;
according to the acquired associated data information, performing comprehensive calculation analysis by using the position distance and the data generation time among the acquisition areas, wherein the associated data information comprises stress, vibration, data generation time and data generation position;
simulating various early warning scenes after a vehicle enters a tunnel through data, wherein the early warning scenes comprise the running speed of the vehicle, the running track of the vehicle, lane changing in the vehicle tunnel, line pressing, tunnel blockage and traffic accidents, and restoring the whole process of the running state of the vehicle in the tunnel;
when the vehicle is overspeed, the vehicle is parked in the tunnel, the lane is changed in the tunnel, the line is pressed in the tunnel, the vehicle runs slowly, the tunnel is blocked or a traffic accident occurs, early warning is timely carried out according to an emergency plan compiled in advance, and corresponding measures are triggered simultaneously.
Optionally, the method further includes:
when a vehicle M passes through the first vertical optical fiber, stress action is generated on the high-precision fiber bragg grating sensor, and stress generation time T is recorded1And (3) responding to the stress information, simultaneously identifying the license plate and locking the vehicle, starting an early warning thread aiming at the vehicle information, generating stress action on a high-precision fiber bragg grating sensor at a tunnel outlet when the vehicle M normally runs to the tunnel outlet, and recording stress generation time TnAfter the stress information is checked to be consistent with the stress information, the vehicle M is determined to normally pass through the tunnel, and the early warning thread is released;
recording the trigger time T when the vehicle M passes the first vertical fibre1Recording the trigger time T as it passes through the second vertical fiber2Calculating the vehicle M in the zone Z11Inner running speed V11＝10/(T2-T1) Calculating the running speed of the vehicle M in the whole tunnel running process in real time, and performing early warning when the running speed exceeds the speed limit;
when the vehicle M passes through the zone Z11From the region Z11Into zone Z21When the optical fiber is in a line pressing state, the multimode sensing optical fiber L1Stress change occurs at corresponding time, and then the vehicle M acts on the multimode sensing optical fiber L simultaneously1And the multimode sensing fiber L2According to the data generation time and the return normal operation time, the vehicle M is determined to be in a line pressing state, and meanwhile early warning is carried out;
when the vehicle M passes through the zone Z11From the region Z11Lane change entry zone Z21While, the multimode sensing fiber L1Stress change occurs in corresponding time, and then the vehicle M continuously acts on the multimode sensing optical fiber L2According to the position and the generation time of the stress change, the vertical optical fiber determines that the vehicle M is in a lane change state, and simultaneously performs early warning;
counting the vehicle bearing capacity of passing vehicles every 200m, if the vehicle bearing capacity exceeds a preset threshold value, indicating that the number of the vehicles entering the area is far larger than that of the vehicles leaving the area, determining that a road section in the tunnel is in a traffic jam state, and simultaneously carrying out early warning;
when the position and time of the stress generation of the vehicle in the tunnel are abnormal, the number of action points in the same area is larger than 8, and the action force is kept unchanged continuously, the camera in the area is switched to confirm the event, if the traffic accident is confirmed, other vehicles are warned, and an emergency plan is started at the same time.
The invention has the following beneficial effects:
the invention provides a road tunnel vehicle driving early warning device and a method thereof based on distributed optical fiber sensing, which comprises a license plate recognition system, an optical fiber data acquisition system, an optical transceiver, an optical fiber, a data exchanger, a storage server and road tunnel vehicle driving early warning equipment, wherein the license plate recognition system locks and marks vehicles driving into a tunnel, synchronously triggers tracking operation, realizes dynamic monitoring of the whole process of the vehicle tunnel, finishes monitoring operation after the vehicles drive out of the tunnel, mainly finishes the acquisition of real-time optical fiber data by the optical fiber data acquisition system, the optical transceiver, the optical fiber and the data exchanger, and carries out high-precision reduction on the vehicle driving state according to the acquired relevant data information such as stress, vibration, data generation time, data generation position and the like; the storage server carries out targeted storage on the real-time collected data according to the collection precision and the identification event type, and the highway tunnel vehicle driving early warning equipment mainly carries out early warning on abnormal conditions of vehicles in the tunnel driving process in time and executes a plan at the same time. Compared with the prior art, the technical scheme provided by the invention combines the distributed optical fiber sensing technology and the license plate recognition technology, has the advantages of simple structure, low cost, high efficiency, stable performance and no blind area, really realizes the intelligent monitoring and full coverage of the running state of the tunnel vehicle, can still normally acquire information and analyze the vehicle state under extreme conditions of low visibility, power failure in the tunnel and the like, and ensures that the early warning system has stronger reliability and is more applicable. The technical scheme provided by the invention combines a distributed optical fiber sensing technology and a license plate recognition technology, constructs a plurality of detection models through real-time data acquisition and analysis, judges the vehicle running condition and the tunnel running state in the tunnel, and carries out early warning and disposal in a targeted manner, so that the tunnel running is safer and more efficient through intelligent monitoring with lower cost.
Drawings
Fig. 1 is a block diagram of a road tunnel vehicle driving early warning device based on distributed optical fiber sensing according to an embodiment of the present invention.
Fig. 2 is an equipment layout diagram of a road tunnel vehicle driving early warning device based on distributed optical fiber sensing according to an embodiment of the present invention.
Fig. 3 is a top view of a region layout of an optical fiber sensing system according to an embodiment of the present invention.
Wherein the reference numerals are: a license plate recognition system-1; an optical fiber data acquisition system-2; an optical transceiver-3; a data switch-4; a storage server-5; a road tunnel vehicle driving early warning device-6.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail the distributed optical fiber sensing-based tunnel vehicle driving early warning apparatus and the method thereof provided by the present invention with reference to the accompanying drawings.
Example one
The embodiment provides a vehicle driving early warning device suitable for a highway tunnel, which mainly comprises a license plate recognition system, an optical fiber data acquisition system, an optical transmitter and receiver, an optical fiber, a data switch, a storage server and highway tunnel vehicle driving early warning equipment, wherein the license plate recognition system is arranged at a tunnel entrance and mainly used for locking and marking vehicles driving into the tunnel, synchronously triggering a tracking program and realizing the dynamic monitoring of the whole process of the vehicle tunnel; the optical fiber data acquisition system host is arranged at a tunnel portal, receives real-time optical fiber sensing information and transmits the information back to the data switch through the optical transceiver; the sensing optical fibers of the road surface in the tunnel are laid according to a regular arrangement mode, when a vehicle passes through, relevant data information such as corresponding stress, vibration, data generation time and data generation position generated by the optical fibers can correspond to various early warning scenes such as vehicle running speed, vehicle running track, lane change in the vehicle tunnel, line pressing, tunnel blockage, traffic accidents and the like through data scene fitting; the data switch mainly calculates the data acquired by the optical fiber data acquisition system, and the dynamic track of the vehicle in the tunnel is restored with high precision through the acquired and calculated data; the storage server is mainly used for storing massive optical fiber sensing data, and performing targeted storage on massive real-time data through the acquisition precision and the identification event type set by the system; the highway tunnel vehicle driving early warning device is mainly used for carrying out threshold value setting on a scene preset plan which is set in advance, and when abnormal conditions occur in the driving process of a vehicle in a tunnel, an early warning device can be triggered.
The road tunnel vehicle driving early warning device based on distributed optical fiber sensing provided by the embodiment mainly comprises a license plate recognition system, an optical fiber data acquisition system, an optical transceiver, an optical fiber, a data switch, a storage server and road tunnel vehicle driving early warning equipment, wherein the license plate recognition system is used for locking and marking vehicles driving into a tunnel, a tracking program is synchronously triggered, the dynamic monitoring of the whole process of the vehicle tunnel is realized, and the monitoring program is ended after the vehicles are driven out of the tunnel; the optical fiber data acquisition system, the optical transceiver, the optical fiber and the data switch mainly complete the acquisition of real-time optical fiber data, and perform high-precision restoration on the vehicle driving state according to the acquired relevant data information such as stress, vibration, data generation time, data generation position and the like; the storage server is used for pertinently storing the real-time acquired data according to the data acquisition precision and the identification event type, and the highway tunnel vehicle driving early warning software is mainly used for early warning in time on abnormal conditions of vehicles in the tunnel driving process and executing a plan.
Fig. 1 is a block diagram of a road tunnel vehicle driving early warning device based on distributed optical fiber sensing according to an embodiment of the present invention. As shown in fig. 1, the whole device mainly comprises a license plate recognition system, an optical fiber data acquisition system, an optical transceiver, an optical fiber, a data switch, a storage server and a road tunnel vehicle driving early warning device. The technical scheme that this embodiment provided combines distributed optical fiber sensing technique and license plate recognition technology, through real-time data analysis, constructs multiple detection model, judges vehicle driving condition and tunnel running state in the tunnel, and the while is pertinence carries out early warning and deals with, through the intelligent monitoring of lower cost for the tunnel operation is safe high-efficient more.
The license plate recognition system provided by the embodiment is mainly arranged at the entrance of a tunnel, mainly locks and marks vehicles entering the tunnel, synchronously triggers a tracking program, realizes the dynamic monitoring of the whole process of the tunnel of the vehicle, and mainly comprises an optical fiber data processing host and distributed multimode sensing optical fibers arranged in a test area according to technical requirements, wherein the optical fiber data processing host is mainly used for processing real-time data information collected by the sensing optical fiber, the distributed multimode sensing optical fiber is laid mainly according to a regular arrangement mode, when a vehicle passes by, relevant data information such as stress, vibration, data generation time, data generation position and the like corresponding to the optical fiber can be generated, through data scene fitting, the method can be corresponding to various early warning scenes such as vehicle running speed, vehicle running track, lane change in a vehicle tunnel, line pressing, tunnel blockage, traffic accidents and the like. The optical transceiver and the transmission optical fiber are mainly used for transmitting tunnel field data information to the tunnel management station, the data switch is mainly used for processing data acquired by the optical fiber data acquisition system for calculation, and dynamic tracks of vehicles in the tunnel are restored with high precision through the acquired and calculated data. The storage server is mainly used for storing massive optical fiber sensing data, and performing targeted storage on massive real-time data through the acquisition precision and the event type identification set by the system. The highway tunnel vehicle driving early warning device is mainly used for carrying out threshold value setting on a scene preset plan which is set in advance, and when abnormal conditions occur in the driving process of a vehicle in a tunnel, an early warning device can be triggered.
Fig. 2 is an equipment layout diagram of a road tunnel vehicle driving early warning device based on distributed optical fiber sensing according to an embodiment of the present invention. As shown in FIG. 2, M1For a license plate recognition system, M2For optical fibre data acquisition systems, M3And M4Is an optical transmitter and receiver, M5Being a data switch, M6Early warning software for road tunnel vehicle running, M7As a storage server, L1、L2Being multimode sensing fibres, L3、L4Is a data transmission fiber. The embodiment combines the distributed optical fiber sensing technology and the license plate recognition technology, has the advantages of simple structure, low cost, high efficiency, stable performance and no blind area, really realizes the full coverage of intelligent monitoring of the running state of the tunnel vehicle, can still normally acquire information under extreme conditions of low visibility, power failure in the tunnel and the like, analyzes the vehicle state, and ensures that the early warning system has stronger reliability and is more applicable.
License plate recognition system M provided by the embodiment1For recognizing information of vehicles entering the tunnel while covering the entrance of the tunnel with L1、L2The vehicle information (vehicle weight) collected by the sensing optical fiber uniquely marks the entering vehicle. Optical fiber data acquisition system host M2The method is mainly used for collecting the optical fiber sensing data in real time. M3And M4Is an optical transmitter and receiver, L3、L4The optical fiber is used for data transmission, and is mainly used for data transfer and transmission. Data exchange M5The method is mainly used for calculation and analysis of sensing data and early warning equipment M for vehicle running in highway tunnel6Mainly based on the analysis and calculation results of the data switch, determining the processing scheme of the thread, and storing the server M7The method is mainly used for storing massive optical fiber sensing data, and storing a large amount of real-time data in a targeted manner through the acquisition precision and the event type identification set by the system.
Fig. 3 is a top view of a region layout of an optical fiber sensing system according to an embodiment of the present invention. As shown in FIG. 3, M is a vehicle simulating passage through a tunnel, L1、L2Is a multimode sensing fiber. FIG. 3 shows the arrangement of the sensing fibers in the tunnel, in which the sensing area is mainly composed of two sensing fibers L1、L2The system is respectively responsible for data acquisition of one lane, and when the length L of the tunnel is more than 3km, the number of the optical fiber sensing host and the number of the sensing optical fibers need to be increased in proportion.
Comprises A11、A22The oval shaded area is vehicle informationIdentifying an area other than a coverage area for license plate identification at L1Optical fiber A11Area extent and L2Optical fiber A224 groups of high-precision fiber grating sensors are uniformly distributed in the area range and used for measuring the vehicle weight information entering the tunnel in real time, the acquired information and the actual vehicle weight are in a linear relation, and the high-precision fiber grating sensors are additionally arranged at the entrance and the exit of the tunnel and the sensing fibers at every 200 m.
The multimode sensing fiber L provided by the embodiment1Laid in a passing lane in the tunnel in a manner shown in FIG. 3, from A11Segment and B11Segment composition region Z11From A to A12Segment and B12Segment composition region Z12And so on. Wherein A is11Segment A12Segment and A1nThe lengths of the segments are equal and are the lane width Lm，B11Segment, B12Segment and B1nThe segments are of equal length, all 10 m.
The multimode sensing fiber L provided by the embodiment2Laid on the inner lane of the tunnel in the way shown in the figure, from A21Segment and B21Segment composition region Z21From A to A21Segment and B21Segment composition region Z21And so on. Wherein A is21Segment A22Segment and A2nThe lengths of the segments are equal and are the lane width Lm，B21Segment, B22Segment and B2nThe segments are of equal length, all 10 m.
The embodiment provides a road tunnel vehicle driving early warning device based on distributed optical fiber sensing, which comprises a license plate recognition system, an optical fiber data acquisition system, an optical transceiver, an optical fiber, a data exchanger, a storage server and road tunnel vehicle driving early warning equipment, wherein the license plate recognition system locks and marks vehicles driving into a tunnel, synchronously triggers tracking operation, realizes dynamic monitoring of the whole process of the vehicle tunnel, finishes monitoring operation after the vehicles drive out of the tunnel, mainly finishes the acquisition of real-time optical fiber data by the optical fiber data acquisition system, the optical transceiver, the optical fiber and the data exchanger, and carries out high-precision restoration on the driving state of the vehicles according to the acquired relevant data information such as stress, vibration, data generation time, data generation position and the like; the storage server carries out targeted storage on the real-time collected data according to the collection precision and the identification event type, and the highway tunnel vehicle driving early warning equipment mainly carries out early warning on abnormal conditions of vehicles in the tunnel driving process in time and executes a plan at the same time. Compared with the prior art, the technical scheme provided by the embodiment combines the distributed optical fiber sensing technology and the license plate recognition technology, has the advantages of simple structure, low cost, high efficiency, stable performance and no blind area, really realizes the intelligent monitoring and full coverage of the running state of the tunnel vehicle, can still normally acquire information and analyze the vehicle state under extreme conditions of low visibility, power failure in the tunnel and the like, and is more suitable for the early warning system with stronger reliability. The technical scheme that this embodiment provided combines distributed optical fiber sensing technique and license plate recognition technology, through real-time data analysis, constructs multiple detection model, judges vehicle driving condition and tunnel running state in the tunnel, and the while is pertinence carries out early warning and deals with, through the intelligent monitoring of lower cost for the tunnel operation is safe high-efficient more.
Example two
The highway tunnel vehicle driving early warning method provided by the embodiment is mainly used for carrying out dynamic intelligent monitoring on vehicles driving in a tunnel in the whole process, each vehicle entering the tunnel is an independent early warning thread, when the vehicle enters the tunnel, a license plate recognition system and an entrance optical fiber sensing acquisition system carry out unique locking and marking on the vehicle through license plate information and strain value information (vehicle weight), the marked vehicle driving information entering the tunnel is acquired in real time through a multimode optical fiber sensing system arranged in the tunnel according to recognition areas, the collected stress, vibration, data generation time, data generation position and other associated data are used, the position distance and the data generation time among the acquisition areas are used for carrying out comprehensive calculation and analysis, and after the vehicle enters the tunnel, the vehicle driving speed, the vehicle driving track, the lane change in the vehicle tunnel, the lane change, The whole process of the running state of the vehicle in the tunnel can be accurately restored by a series of characteristic phenomena such as line pressing, tunnel blockage, traffic accidents and the like. When the conditions of vehicle overspeed, parking in the tunnel, lane change in the tunnel, line pressing in the tunnel, slow vehicle running, tunnel blockage, traffic accidents and the like occur, early warning is timely carried out and corresponding measures are triggered according to an emergency plan compiled in advance, so that the response speed and the accuracy are improved.
The following conditions mainly exist in the tunnel:
(1) normal running
Referring to FIG. 3, the vehicle M travels normally in the traffic lane when passing L1Optical fiber A11When the area is in the range, the stress effect is generated on the high-precision fiber grating sensor arranged in the area, and the stress generation time T is recorded1And stress information (vehicle weight) is responded, license plate recognition and locking are triggered at the same time, an early warning thread aiming at the vehicle information is started, and when the vehicle stably and normally runs to an exit in the tunnel, an exit A is controlled1nThe high-precision fiber grating sensor arranged in the segment generates stress action and records stress generation time TnAnd after the stress information (vehicle weight) is matched, the vehicle M is indicated to be at T1～TnAnd in a time period, the early warning thread is released through the tunnel.
(2) Speed of vehicle
Referring to FIG. 3, a vehicle M passes A11When the area is within range, recording trigger time T1Through A12When the area is within range, recording trigger time T2Then the vehicle M is in zone Z11Inner running speed V11＝10/(T2-T1) And when the vehicle speed exceeds the speed limit, the vehicle can be warned by means of a variable information board, broadcast and the like to give an early warning.
(3) Pressing line
Referring to FIG. 3, as the vehicle M passes Z11Region and consisting of Z11Zone entry Z21When the region is in the line-pressing state, L1Optical fiber B11The region range has stress change corresponding to time, and then the vehicle M acts on A respectively12Region A and22the region acts on L twice and simultaneously1Optical fiber and L2The optical fiber can represent the vehicle line pressing state according to the data generation time and the normal operation time, and can give an early warning in time by means of warning, broadcasting and the like of the variable information board.
(4) Lane changing device
Referring to FIG. 3, as the vehicle M passes Z11Region and consisting of Z11Zone lane change entry Z21Region of time, L1Optical fiber B11The region has stress change corresponding to time, and then the vehicle M can change from L1Optical fiber Z11The region completely enters Z by two points twice21Region, then sustained action A22Segment and A2nIn the zones such as the sections, according to the stress change position and the generation time, the lane change state of the vehicle can be represented, and early warning is carried out in time by means of warning, broadcasting and the like of a variable information board.
(5) Traffic jam
Referring to fig. 3, every 200M of the tunnel is used as a tunnel running state monitoring unit, a high-precision fiber bragg grating sensor is additionally arranged on a sensing optical fiber at the entrance and exit of each monitoring unit, and when a vehicle M enters a monitoring unit N1In addition to the locking of the marking of the vehicle, the monitoring unit N is also locked1Vehicle load capacity gauge number N1sPerforming a plus 1 operation when the vehicle M leaves the monitoring unit N1Namely the entering monitoring unit N2In addition to the vehicle marking confirmation, the monitoring unit N is also checked1Vehicle load capacity gauge number N1sPerforming a subtract 1 operation on the monitoring unit N2Vehicle load capacity gauge number N2sAnd adding 1, and so on, and finishing the bearing capacity counting work of the vehicle after the vehicle leaves the tunnel. Therefore, when the number of the vehicle bearing capacity counts in a certain tunnel running state monitoring unit exceeds a threshold value, the vehicles entering the area are far larger than the vehicles leaving the area, the road section in the tunnel can be represented to be in a traffic jam state, and early warning is carried out in time by means of warning, broadcasting and the like of a variable information board.
(6) Traffic accident
Referring to fig. 3, when the vehicle driving state in the tunnel, i.e. the stress generating position and time are abnormal, the number of action points is greater than 8 in the same area, and the action force is kept constant, the area camera should be automatically switched to confirm the event, if a traffic accident happens, other vehicles should be warned in time by means of a variable information board, broadcasting and the like, and an emergency plan should be started at the same time, so that the search and rescue efficiency is improved, and the loss is reduced to the maximum extent.
The embodiment provides a road tunnel vehicle running early warning method based on distributed optical fiber sensing, wherein a vehicle running early warning device comprises a license plate recognition system, an optical fiber data acquisition system, an optical transceiver, an optical fiber, a data exchanger, a storage server and road tunnel vehicle running early warning equipment, wherein the license plate recognition system locks and marks vehicles running into a tunnel, synchronously triggers tracking operation, realizes dynamic monitoring of the whole process of the vehicle tunnel, finishes monitoring operation after the vehicles run out of the tunnel, mainly finishes the acquisition of real-time optical fiber data by the optical fiber data acquisition system, the optical transceiver, the optical fiber and the data exchanger, and carries out high-precision reduction on the vehicle running state according to the acquired relevant data information such as stress, vibration, data generation time, data generation position and the like; the storage server carries out targeted storage on the real-time collected data according to the collection precision and the identification event type, and the highway tunnel vehicle driving early warning equipment mainly carries out early warning on abnormal conditions of vehicles in the tunnel driving process in time and executes a plan at the same time. Compared with the prior art, the technical scheme provided by the embodiment combines the distributed optical fiber sensing technology and the license plate recognition technology, has the advantages of simple structure, low cost, high efficiency, stable performance and no blind area, really realizes the intelligent monitoring and full coverage of the running state of the tunnel vehicle, can still normally acquire information and analyze the vehicle state under extreme conditions of low visibility, power failure in the tunnel and the like, and is more suitable for the early warning system with stronger reliability. The technical scheme that this embodiment provided combines distributed optical fiber sensing technique and license plate recognition technology, through real-time data analysis, constructs multiple detection model, judges vehicle driving condition and tunnel running state in the tunnel, and the while is pertinence carries out early warning and deals with, through the intelligent monitoring of lower cost for the tunnel operation is safe high-efficient more.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A road tunnel vehicle driving early warning device based on distributed optical fiber sensing is characterized by comprising a license plate recognition system, an optical fiber data acquisition system, an optical transmitter and receiver, an optical fiber, a data exchanger, a storage server and road tunnel vehicle driving early warning equipment, wherein the license plate recognition system is arranged at a tunnel entrance;
the license plate recognition system is used for locking and marking vehicles entering the tunnel, synchronously triggering tracking operation and realizing dynamic monitoring of the whole process of the vehicle tunnel;
the optical fiber is used for generating corresponding associated data information when a vehicle passes by, wherein the associated data information comprises stress, vibration, data generation time and data generation position;
the optical fiber data acquisition system is used for acquiring real-time optical fiber data, and the real-time optical fiber data comprises associated data information;
the optical transceiver is used for transmitting the real-time optical fiber data to the data switch;
the data switch is used for enabling the associated data information in the real-time optical fiber data to correspond to an early warning scene through data scene fitting, restoring the running state of the vehicle and finally restoring the dynamic track of the vehicle in the tunnel, wherein the early warning scene comprises the running speed of the vehicle, the running track of the vehicle, lane changing, line pressing, tunnel blockage and traffic accidents in the vehicle tunnel;
the storage server is used for storing real-time optical fiber data and storing the real-time optical fiber data in a targeted manner according to preset acquisition precision and identification event types;
the highway tunnel vehicle driving early warning device is used for setting corresponding threshold values in advance according to various scene plans, and when abnormal conditions of vehicles in the tunnel driving process exceed the corresponding threshold values, early warning actions are triggered.
2. The distributed optical fiber sensing-based road tunnel vehicle driving early warning device as claimed in claim 1, wherein the optical fiber comprises a multimode sensing optical fiber and a data transmission optical fiber, and the multimode sensing optical fiber arranged at the entrance of the tunnel, the exit of the tunnel and the road surface in the tunnel are provided with high-precision fiber bragg grating sensors at intervals of 200 m.
3. The distributed optical fiber sensing-based road tunnel vehicle driving early warning device as claimed in claim 2, wherein the multimode sensing optical fiber L is1The multimode sensing optical fiber is arranged in a lane passing in the tunnel, the multimode sensing optical fiber comprises vertical optical fibers and parallel optical fibers which are alternately arranged at intervals, the vertical optical fibers are vertical to the tunnel direction, the parallel optical fibers are parallel to the tunnel direction, the lengths of all sections of the vertical optical fibers are equal, and the lengths of all sections of the vertical optical fibers are lane widths LmThe lengths of the parallel optical fibers are equal and are 10 m.
4. The distributed optical fiber sensing-based road tunnel vehicle driving early warning device as claimed in claim 2, wherein the multimode sensing optical fiber L is2The multimode sensing optical fiber is arranged in a lane in a tunnel, the multimode sensing optical fiber comprises vertical optical fibers and parallel optical fibers which are alternately arranged at intervals, the vertical optical fibers are vertical to the tunnel direction, the parallel optical fibers are parallel to the tunnel direction, the lengths of all sections of the vertical optical fibers are equal, and the lengths of all sections of the vertical optical fibers are lane widths LmThe lengths of the parallel optical fibers are equal and are 10 m.
5. The distributed optical fiber sensing-based highway tunnel vehicle driving early warning device according to claim 1, wherein when the tunnel length is greater than 3km, the number of the optical fiber data acquisition systems and the optical fibers is increased according to a preset proportion.
6. A road tunnel vehicle driving early-warning method based on distributed optical fiber sensing, which is characterized in that the road tunnel vehicle driving early-warning method uses the road tunnel vehicle driving early-warning device of any one of claims 1-5, and the road tunnel vehicle driving early-warning method comprises the following steps:
the method comprises the following steps that dynamic intelligent monitoring is carried out on vehicles running in a tunnel in the whole process, the vehicles entering the tunnel are all independent early warning threads, and when the vehicles enter the tunnel, the license plate recognition system and the optical fiber data acquisition system carry out uniqueness locking and marking on the vehicles through license plate information and strain value information;
the method comprises the steps that multimode sensing optical fibers and data transmission optical fibers which are distributed in a tunnel according to an identification area are used for collecting driving information of a marked vehicle entering the tunnel in real time;
according to the acquired associated data information, performing comprehensive calculation analysis by using the position distance and the data generation time among the acquisition areas, wherein the associated data information comprises stress, vibration, data generation time and data generation position;
simulating various early warning scenes after a vehicle enters a tunnel through data, wherein the early warning scenes comprise the running speed of the vehicle, the running track of the vehicle, lane changing in the vehicle tunnel, line pressing, tunnel blockage and traffic accidents, and restoring the whole process of the running state of the vehicle in the tunnel;
when the vehicle is overspeed, the vehicle is parked in the tunnel, the lane is changed in the tunnel, the line is pressed in the tunnel, the vehicle runs slowly, the tunnel is blocked or a traffic accident occurs, early warning is timely carried out according to an emergency plan compiled in advance, and corresponding measures are triggered simultaneously.
7. The distributed optical fiber sensing-based highway tunnel vehicle driving early warning method according to claim 6, further comprising:
when a vehicle M passes through the first vertical optical fiber, stress action is generated on the high-precision fiber bragg grating sensor, and stress generation time T is recorded1And stressInformation, license plate recognition and vehicle locking are simultaneously carried out, an early warning thread aiming at the vehicle information is started, when the vehicle M normally runs to a tunnel outlet, a stress effect is generated on a high-precision fiber grating sensor at the tunnel outlet, and stress generation time T is recordednAfter the stress information is checked to be consistent with the stress information, the vehicle M is determined to normally pass through the tunnel, and the early warning thread is released;
recording the trigger time T when the vehicle M passes the first vertical fibre1Recording the trigger time T as it passes through the second vertical fiber2Calculating the vehicle M in the zone Z11Inner running speed V11＝10/(T2-T1) Calculating the running speed of the vehicle M in the whole tunnel running process in real time, and performing early warning when the running speed exceeds the speed limit;
when the vehicle M passes through the zone Z11From the region Z11Into zone Z21When the optical fiber is in a line pressing state, the multimode sensing optical fiber L1Stress change occurs at corresponding time, and then the vehicle M acts on the multimode sensing optical fiber L simultaneously1And the multimode sensing fiber L2According to the data generation time and the return normal operation time, the vehicle M is determined to be in a line pressing state, and meanwhile early warning is carried out;
when the vehicle M passes through the zone Z11From the region Z11Lane change entry zone Z21While, the multimode sensing fiber L1Stress change occurs in corresponding time, and then the vehicle M continuously acts on the multimode sensing optical fiber L2According to the position and the generation time of the stress change, the vertical optical fiber determines that the vehicle M is in a lane change state, and simultaneously performs early warning;
counting the vehicle bearing capacity of passing vehicles every 200m, if the vehicle bearing capacity exceeds a preset threshold value, indicating that the number of the vehicles entering the area is far larger than that of the vehicles leaving the area, determining that a road section in the tunnel is in a traffic jam state, and simultaneously carrying out early warning;
when the position and time of the stress generation of the vehicle in the tunnel are abnormal, the number of action points in the same area is larger than 8, and the action force is kept unchanged continuously, the camera in the area is switched to confirm the event, if the traffic accident is confirmed, other vehicles are warned, and an emergency plan is started at the same time.
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