CN1870070A - Traffic information single-coil field detection method - Google Patents
Traffic information single-coil field detection method Download PDFInfo
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Abstract
An on-site detecting method of traffic information by single coil includes detecting vehicle type as comparing time-varying drawing of coil inductance value at time of passing vehicle on coil buried underground with preset time-varying drawing model for various vehicle then using drawing match method to defect out type of vehicle, detecting vehicle speed as adding said coil width B on typical length L of this type of vehicle then dividing obtained figure by time P of said vehicle on said coil for obtaining vehicle speed V.
Description
Technical field
The invention belongs to the intelligent transportation system field, the detection method that only relates to the transport information of road, be particularly related to a kind of detection method that adopts single coil to gather transport information in the primary scene, related transport information only comprises the traffic and the traffic events of flow, vehicle, speed and the automobile traffic stream of motor vehicles.
Background technology
The practice of developed country's recent two decades intelligent transportation system shows, building intelligent transportation system (ITS) is the only way of alleviating traffic congestion, reducing traffic hazard, restrain traffic pollution, and complete, in time, transport information is the precondition of building modern intelligent transportation system accurately.Transport information can be divided into static and dynamic two classes by different demands.So-called static information is the traffic study data by the period statistics, mainly comprises the period natural flow by the type of vehicle statistics, by the period normal flow (pcu/h) of vehicle conversion and the period average velocity of vehicle etc.The main application of static information is to provide the traffic study data for traffic programme, design, road network transformation and roadupkeep.So-called multidate information is the real-time information of road traffic flow, mainly comprises traffic and traffic event information, travel information and traffic image information etc.The main application of multidate information is to provide real-time telecommunication flow information for intelligent transportation systems such as traffic monitoring, transport information issue, public's vehicle guidance, traffic signals controls.
But the automatic detection of transport information, the especially automatic detection of dynamic information becomes two technical barriers that whole world intelligent transportation industry faces unexpectedly.Go out at the transportation modernization ten big gordian technique middle fingers that proposed as national departments concerned, " acquisition of road traffic information and issue gordian technique " and " the road traffic emergency reaction technology of accident " are two bottlenecks in world's intelligent transportation system technology.
The automatic testing method of Traffic Information is numerous, and detection methods such as toroid winding, ultrasound wave, infrared, laser, microwave and image are arranged.The practice of over half a century shows, is called for short many advantages such as coil is round-the-clock because of having, hidden as the traffic information detection method of contactless sensing element, environmental protection with toroid winding, remains the most reliable flow rate testing methods so far.Because traditional twin coil speed of a motor vehicle, the clumsy performance of vehicle detection method under abominable traffic, the whole world is all in the ceaselessly various new materials of exploratory development, new technology and new method during the last ten years, try hard to replace the twin coil detection method of outmoded backwardness, but do not obtain gratifying result so far, the ultimate challenge that runs into is to be difficult to adapt to all weather operations condition.
Fig. 1 has showed the twin coil detection method of a kind of known speed of a motor vehicle, vehicle, and it is the classic method of always using till today decades in the world.The principle that detects the magnitude of traffic flow with coil is: the inductance value of coil can change when vehicle sails coil into, and wagon detector detects this variation, and to export a logic immediately be genuine signal, and the expression vehicle has just sailed coil into, and term claims vehicle to occupy; The inductance value of coil can return to the numerical value of no car when occupying when vehicle sails out of coil, wagon detector detects this variation and exports the signal of a logic for vacation immediately, the expression vehicle has just sailed out of coil, the vehicle of wagon detector output is occupied signal transport to counter, the result that counter obtains crosses the vehicle flowrate of this coil.Obvious this unicoil flow rate testing methods can not detect the speed of a motor vehicle, vehicle.For detecting the speed of a motor vehicle, vehicle, people have invented the twin coil detection method of burying a pair of coil in track central vehicle travel direction center distance D (European standard is 4.5m) underground very early.The principle that twin coil detects the speed of a motor vehicle is: measure vehicle earlier from sailing out of coil 1 to the time T of sailing out of coil 2 (perhaps from sailing coil 1 into to sailing coil 2 into), press formula V=D/T then and calculate the travel speed V that obtains vehicle.The principle that twin coil detects vehicle is: measure the holding time P (promptly from vehicle sail to the time of sailing out of coil) of vehicle on any one coil earlier, the width of known coil is B and the vehicle velocity V that just recorded, calculate the vehicle length L by formula L=V*P-B, and then divide large, medium and small three kinds of vehicles by vehicle length.
From top introduction as can be known, the twin coil detection method is for detecting the travel speed and the vehicle of vehicle, must keep not having other vehicles in the certain distance before and after the tested vehicle, that is the clear distance between tested vehicle and the adjacent vehicle must be greater than sensing range 6.5m (D+B), otherwise just can't detect the speed of a motor vehicle, vehicle, measuring ability almost exhausts.Under the abominable traffic intensive in wagon flow, that speed slow even start-stop stops, the spacing of most of vehicle can not aggravated the deterioration of traffic otherwise will jump the queue because of vehicle less than 6.5m.Need most in intelligent transportation system provide in time, moment of information of vehicles accurately, the twin coil detection method is done nothing too greatly because of sensing range, Here it is causes one of low major reason of world's intelligent transportation system technical merit.
The intelligent transportation system crucial effects is, in time, detect, report traffic and traffic events exactly automatically, artificial rapidly place, the character of determining incident is rescued personnel, property at top speed, dredges as early as possible and resumes traffic.Because traffic behavior and traffic events at random, bursty nature, in existing intelligent transportation system, also do not seen traffic events and detected warning at first automatically by system.The level of traffic and traffic events Automatic Measurement Technique is low, slow in reacting, false drop rate is big, has to continue to rely on manpower to carry out video monitor, is " high-quality precision and sophisticated technology that does not have practical value " Nan Gua transport information Automatic Measurement Technique is now ridiculed by the self-examination person of intelligent transportation system.Research, exploitation traffic and traffic events Automatic Measurement Technique are not in order to save manpower, but seek partly to substitute even to surmount the intelligence machine of manpower.
Cause world's traffic and the low reason of traffic events Automatic Measurement Technique level, except the twin coil detection method introduced above can not provide in time when the abominable traffic, accurately the information of vehicles, another major reason is the system architecture method of " separation two places ".The system architecture method that detects of whole world traffic and traffic events is up to now: the traffic data of the magnanimity that on-the-spot twin coil wagon detector is collected, by cycle regular hour (being generally 60) average packet of the cycle that is compressed into to 300s, the teletransmission of fixed cycle ground is to information center, by the traffic of information center and concentrated detection of computer program of traffic events detection then.The fatal shortcoming of the system architecture method of this computer program separation two places with on-the-spot vehicle detection hardware and information center is: in order to alleviate the pressure of mass traffic information real-time Transmission to communication network and central computer, have to adopt the data compression method of cycle mean value, this just average data compression method of cycle has ruined a large amount of transient exceedingly useful on-the-spot information of vehicles.
In sum, cause two main causes of whole world transport information detection technique stagnation to be:
One, the sensing range because of the twin coil detection method is too big, and the speed of a motor vehicle, vehicle information can't be provided in time, exactly.
Two, on-the-spot because of the computer program of traffic and traffic events detection away from detecting, can't in time obtain intact information of vehicles.
Summary of the invention
At the existing many shortcomings of above-mentioned transport information detection technique, task of the present invention provides a kind of traffic information single-coil field detection method, it has solved above-mentioned twin coil detection method can't provide the speed of a motor vehicle, vehicle information in time, exactly, and the problem that can't in time obtain intact information of vehicles.
Technical solution of the present invention is as follows:
A kind of traffic information single-coil field detection method detects vehicle, the speed of motor vehicles on the road, only buries a coil on every track underground, follows these steps to detect earlier detect the speed of a motor vehicle after the vehicle:
Wherein the vehicle detection method is: when crossing a coil according to vehicle winding inductance quantity the time become the closely-related feature of shape of figure and vehicle bottom metal member, by the comparison tested vehicle when crossing a coil winding inductance quantity the time become figure and the various vehicles of setting up in advance the time become graph model, detect vehicle with the method for figure coupling;
Wherein method for detecting vehicle speed is: measure the holding time of tested vehicle on coil earlier, receiving that vehicle that wagon detector is sent occupies signal is that true time starts timer, when receiving that vehicle that wagon detector is sent occupies signal is that fictitious time stops timer, the value of timer is exactly the holding time P of tested vehicle on coil, the typical length L of this vehicle that the pairing statistics in advance of the above-mentioned vehicle that has recorded is definite adds known coil width B, divided by the holding time P of above-mentioned tested vehicle on coil, promptly record the travel speed V of vehicle again.
The system architecture method that adopts a kind of traffic and traffic events to detect, computer program with traffic in the intelligent transportation system and traffic events detection, from the computing machine of traffic information center, transfer among the industrial microcomputer IPC that detects in the on-the-spot roadside cabinet, the wagon detector of living together in the cabinet of roadside is directly linked to each other with the data communication port of IPC, so that directly receive wagon detector give with vehicle occupy signal and coil inductance data, and detecting the on-the-spot detection of traffic and traffic events of carrying out.
Two lead-in wires that are embedded in a coil on the shallow top layer of track central authorities are inserted wagon detector in the cabinets of roadside, the output signal of wagon detector is received industrial microcomputer IPC, IPC is connected with information center by communication line.
The width of a described coil is 0.7m.
Described comparison tested vehicle the time become figure and vehicle time change graph model be that the crest of these two and quantity, order and the amplitude difference of trough are discerned.
Detection method of the present invention and traditional detection method have following difference on composition form:
1, owing to bigger, therefore normally used digital signal processor (DSP) among Fig. 1 is changed into industrial microcomputer (IPC) by detection method of the present invention calculation process amount at the scene.
2, classic method only needs wagon detector output vehicle to occupy signal, in addition also needs wagon detector outputting inductance delta data by method of the present invention.Most of coil type wagon detector can both provide vehicle to occupy signal and inductance delta data simultaneously.
3, the method for uploading of the testing result of DSP is regularly to send to information center after (being generally 60 to 300s) cycle mean value compression packing with testing result in the classic method, though the cycle average data is also arranged by method of the present invention, but they just are kept at this locality as the traffic study data of mood, just be uploaded to information center when computing machine is idle, the information of uploading in real time has only traffic and traffic event information.
4, classic method is installed in information center with the computer program of traffic and traffic events, by method of the present invention computer program is installed among the on-the-spot IPC, by on-the-spot IPC the automatic detection of traffic and traffic events is carried out in the linchpin track, changed or find just report information center immediately of traffic generation ANOMALOUS VARIATIONS (traffic events promptly takes place) in case find traffic.
By detection method of the present invention, twin coil is reduced to unicoil, and use IPC at the scene, and gather transport information in the primary scene, the transport information of being gathered comprises the traffic and the traffic events of flow, vehicle, speed and the automobile traffic stream of motor vehicles.Therefore the present invention has solved the technical barrier in world's intelligent transportation system preferably owing to taked the above-mentioned simple technical measures that seem, and has promoted the traffic information collection development of technology.
Description of drawings
Fig. 1 is the schematic block diagram of traditional twin coil detection method.
Fig. 2 is the schematic block diagram of traffic information single-coil field detection method of the present invention.
When Fig. 3 has represented that heavy towed vehicle crosses unicoil inductance value the time become figure.
When Fig. 4 has represented that buggy crosses unicoil inductance value the time become figure.
When Fig. 5 has represented that minibus crosses unicoil inductance value the time become figure.
Embodiment
Introduce the embodiment and the implementation result of two detection methods of the present invention in detail below in conjunction with Fig. 2.
One, the detection method of monocoil flow, vehicle, speed
Two lead-in wires that are embedded in a coil on the shallow top layer of track central authorities are inserted wagon detector in the cabinets of roadside, the output signal of wagon detector is received IPC, IPC is connected with information center by communication line.
No matter with unicoil or twin coil, flow detection all only needs a coil, and the width B of coil is generally 2m, just can detect flow exactly as long as the clear distance of adjacent vehicle is not less than coil width, and the flow detection precision is better than 90% generally speaking.In order further to improve the flow detection precision, the width of the coil that the present invention selects only is 0.7m, therefore just can exactly they be separated as long as the clear distance of adjacent vehicle is not less than 1m.By a large amount of experiment statisticses, flow detection precision of the present invention is better than 99.9%.
The detection method of unicoil vehicle, speed and traditional twin coil detection method in the form, the difference of the two only is the consumption difference of coil, but it is completely different to detect principle.Though the insider knows that the principle of work of coil type wagon detector is judged by the magnetic test coil variation inductance and has or not automobile storage to exist, but people only pay close attention to the logical consequence that has or not vehicle for a long time, and what special relationship Changing Pattern and the type of vehicle of not knowing inductance value have.By detection method of the present invention, the shape that becomes figure and vehicle bottom metal member when vehicle crosses coil during winding inductance quantity is closely related, and the two has following must the relation theoretically:
(1) vehicle that type is different has different figures;
(2) the similar vehicle of type has similar figure;
(3) vehicle that type is identical has identical figure.
Referring to Fig. 3, Fig. 4 and Fig. 5, the comparison tested vehicle the time become figure and vehicle time change graph model be that the crest of these two and quantity, order and the amplitude difference of trough are discerned.Two wheel shafts are arranged at the back bottom of heavier towed vehicle and buggy, the back axle of heavy towed vehicle, and time becomes the figure rear portion two troughs are also arranged, and the back axle of buggy has only a wheel shaft, and time becomes the figure rear portion and also has only a trough.Smaller passenger vehicle and heavy towed vehicle or buggy, the difference of change figure medium wave peak, trough quantity when their obvious difference is.Heavier towed vehicle and buggy the time become figure, both remarkable differences are that maximum crest is different with the ratio of maximum trough, and so on.As long as vehicle be not down to travel, the identification even start-stop stops also being not difficult.Such as 5 tons of load-carrying vehicles of east wind 140 types of a standard configuration, when and where anybody car appears at, no matter also load what thing, loading what, as long as repacking is implemented in vehicle bottom, always the inductance value delta data the time to become figure identical.
With to detect vehicle after traditional double coil detection method detects earlier the speed of a motor vehicle different, unicoil detection side rule of the present invention is to detect the speed of a motor vehicle after detecting vehicle earlier, and concrete steps are as follows:
1, set up various vehicles the time become the graph model database.According to the various type of vehicle of national Specification such as minibus, motor bus, buggy, middle lorry, truck, towed vehicle etc., detect collection in worksite and set up corresponding with various vehicles time change graph model database.
2, determine the typical length of various vehicles.At the vehicle length value that detects a large amount of similar vehicles of collection in worksite, obtain the typical length of various vehicles according to the various type of vehicle of national Specification then with the arithmetic mean method.Also should define the typical length of " unknown vehicle " in addition, so that in the time can not discerning, also can estimate the speed of a motor vehicle.
3, the unicoil vehicle detects.In the tested vehicle occupancy, constantly receive the inductance delta data that wagon detector is sent, obtain thus the tested vehicle inductance value the time become figure, when tested vehicle just sails out of toroid winding immediately from the time become to become when seeking the graph model database and become graph model when figure is complementary with tested vehicle, if become graph model when finding this, be exactly the model vehicle with regard to the type of judging tested vehicle; If become graph model when can not find this, then as unknown vehicle.That is to say, when crossing a coil according to vehicle winding inductance quantity the time become the closely-related feature of shape of figure and vehicle bottom metal member, by the comparison tested vehicle when crossing a coil winding inductance quantity the time become figure and the various vehicles of setting up in advance the time become graph model, detect vehicle with the method for figure coupling.By detection method of the present invention, can discern following ten surplus kind of type of vehicle: minibus, motor bus, articulated coach, buggy, middle lorry, truck, heavy goods vehicle, towed vehicle, heavy towed vehicle, flat-bed trailer, tractor, motorcycle etc.As required, vehicle can increase and decrease.By a large amount of experiment statisticses, generally the accuracy of detection of type of vehicle is better than 90%.
4, the unicoil speed of a motor vehicle detects.Measure the holding time of tested vehicle on coil earlier, receiving that vehicle that wagon detector is sent occupies signal is that true time starts timer, when receiving that vehicle that wagon detector is sent occupies signal is that fictitious time stops timer, the value of timer is exactly the holding time P of tested vehicle on coil, the typical length L of this vehicle that the pairing statistics in advance of the above-mentioned vehicle that has recorded is definite adds known coil width B, divided by the holding time P of above-mentioned tested vehicle on coil, promptly record the travel speed V of vehicle again.Just can obtain the travel speed V of vehicle by formula V=(L+B)/P.By a large amount of experiment statisticses, generally the accuracy of detection of speed is better than 85%, and the slow more precision of speed is high more.
Unicoil vehicle of the present invention, method for detecting vehicle speed for the contribution of traffic information collection technology are: when traffic congestion even traffic hazard take place, that is when intelligent transportation system presses for transport information most, still can detect the transport information of traffic flow and even each car accurately.
Two, the system architecture method of traffic and traffic events detection
Causing traffic and the low first cause of traffic events detection technique level is wagon detector hardware and computer program separation two places, even adopt the high precision information of vehicles that the unicoil detection method obtains still can't the present traffic of radical change and the backward situation of traffic events detection technique.Because the fatal problem of the system architecture method of separation two places is that vehicle information such as the flow that information center's computer program is received, the speed of a motor vehicle, vehicle can not be that each car sails and sail out of real-time information constantly into.It is reported that the ability of accepting commission of domestic state-of-the-art security exchange platform maximum is per second 1300 times, if intelligent transportation system has 200 collection points, each collection point has 8 to detect the track, average every 2s crosses a car, require the ability of receiving information in real time of intelligent transportation system to be about so 1600 times, obviously this is unpractical.Whole world intelligent transportation system that Here it is has to adopt the odjective cause of period average according to compression method.
In order thoroughly to solve the bottleneck problem of real-time data communication, the specific embodiment of the present invention is: computer program is removed to the IPC that detects in the cabinet of on-the-spot roadside from traffic information center, the wagon detector of living together in the cabinet of roadside is directly linked to each other with the data communication port of IPC, so that directly receive wagon detector give with vehicle occupy signal and coil inductance data, and detecting the on-the-spot detection of traffic and traffic events of carrying out.This system architecture method that detects traffic and civilian interpreter's part in the primary scene has not only greatly alleviated the burden of communication network and central computer, more of historical significance is the transport condition that computer program can obtain each car on coil in the very first time, in case the unusual vehicle of Discovery Status just can be made reflection immediately, has been buried by the cycle averaging method never again.
By experimental results demonstrate, after adopting system architecture method of the present invention, detect performance and obtained unprecedented raising: at blocked road, as highway, urban express way, the detection speed of traffic and traffic events is not more than 100s/km usually, crossing being subjected to traffic signals control is not more than 3 times of traffic signals cycles detection time usually, and rate of false alarm is zero.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention variation, the modification of the foregoing description.
Claims (5)
1. traffic information single-coil field detection method detects vehicle, the speed of motor vehicles on the road, it is characterized in that, only buries a coil on every track underground, follows these steps to detect earlier detect the speed of a motor vehicle after the vehicle:
Wherein the vehicle detection method is: when crossing a coil according to vehicle winding inductance quantity the time become the closely-related feature of shape of figure and vehicle bottom metal member, by the comparison tested vehicle when crossing a coil winding inductance quantity the time become figure and the various vehicles of setting up in advance the time become graph model, detect vehicle with the method for figure coupling;
Wherein method for detecting vehicle speed is: measure the holding time of tested vehicle on coil earlier, receiving that vehicle that wagon detector is sent occupies signal is that true time starts timer, when receiving that vehicle that wagon detector is sent occupies signal is that fictitious time stops timer, the value of timer is exactly the holding time P of tested vehicle on coil, the typical length L of this vehicle that the pairing statistics in advance of the above-mentioned vehicle that has recorded is definite adds known coil width B, divided by the holding time P of above-mentioned tested vehicle on coil, promptly record the travel speed V of vehicle again.
2. according to the described traffic information single-coil field detection method of claim 1, it is characterized in that, the system architecture method that adopts a kind of traffic and traffic events to detect, computer program with traffic in the intelligent transportation system and traffic events detection, from the computing machine of traffic information center, transfer among the industrial microcomputer IPC that detects in the on-the-spot roadside cabinet, the wagon detector of living together in the cabinet of roadside is directly linked to each other with the data communication port of IPC, so that directly receive wagon detector give with vehicle occupy signal and coil inductance data, and detecting the on-the-spot detection of traffic and traffic events of carrying out.
3. according to claim 1 or 2 described traffic information single-coil field detection methods, it is characterized in that, two lead-in wires that are embedded in a coil on the shallow top layer of track central authorities are inserted wagon detector in the cabinets of roadside, the output signal of wagon detector is received industrial microcomputer IPC, and IPC is connected with information center by communication line.
4. according to the described traffic information single-coil field detection method of claim 1, it is characterized in that the width of a described coil is 0.7m.
5. according to the described traffic information single-coil field detection method of claim 1, it is characterized in that, described comparison tested vehicle the time become figure and vehicle time change graph model be that the crest of these two and quantity, order and the amplitude difference of trough are discerned.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433072C (en) * | 2007-03-01 | 2008-11-12 | 上海三全科技有限公司 | The single-loop and single-section onsite detection method for traffic situation and traffic accident |
| CN101311728B (en) * | 2007-05-22 | 2010-12-08 | 深圳市哈工大交通电子技术有限公司 | Vehicle speed checking device and method |
| CN102426787A (en) * | 2011-11-11 | 2012-04-25 | 北京交通发展研究中心 | Method and system for measuring speed of vehicle by using single magnetic induction strength sensor |
| CN101311982B (en) * | 2007-05-22 | 2012-05-23 | 深圳市哈工大交通电子技术有限公司 | Vehicle assorted check detection device and method |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN102760360A (en) * | 2012-07-26 | 2012-10-31 | 南京洛普股份有限公司 | Traffic intersection vehicle flow single detector detection method based on decision theory |
| CN104167096A (en) * | 2014-08-29 | 2014-11-26 | 南京理工大学 | Urban traffic congestion early warning method, device and system |
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2006
- 2006-06-20 CN CNB200610027885XA patent/CN100511322C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433072C (en) * | 2007-03-01 | 2008-11-12 | 上海三全科技有限公司 | The single-loop and single-section onsite detection method for traffic situation and traffic accident |
| CN101311728B (en) * | 2007-05-22 | 2010-12-08 | 深圳市哈工大交通电子技术有限公司 | Vehicle speed checking device and method |
| CN101311982B (en) * | 2007-05-22 | 2012-05-23 | 深圳市哈工大交通电子技术有限公司 | Vehicle assorted check detection device and method |
| CN102426787A (en) * | 2011-11-11 | 2012-04-25 | 北京交通发展研究中心 | Method and system for measuring speed of vehicle by using single magnetic induction strength sensor |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN102760360A (en) * | 2012-07-26 | 2012-10-31 | 南京洛普股份有限公司 | Traffic intersection vehicle flow single detector detection method based on decision theory |
| CN102760360B (en) * | 2012-07-26 | 2014-07-09 | 南京洛普股份有限公司 | Traffic intersection vehicle flow single detector detection method based on decision theory |
| CN104167096A (en) * | 2014-08-29 | 2014-11-26 | 南京理工大学 | Urban traffic congestion early warning method, device and system |
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Effective date of registration: 20230619 Address after: Room 803, Building 2, No. 7198 Hangnan Road, Fengxian District, Shanghai, January 2014 Patentee after: Shanghai pingfeasible Intelligent Technology Co.,Ltd. Address before: 200129 room 19, No. 2511, Lane 903, Pudong Avenue, Shanghai Patentee before: SHANGHAI SANQUAN SCIENTIFIC Corp. |
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