CN103871233B - Based on the traffic event information dissemination method of floating car data - Google Patents
Based on the traffic event information dissemination method of floating car data Download PDFInfo
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Abstract
The invention discloses a kind of traffic event information dissemination method based on floating car data, belong to intelligent transportation field, the method comprises: detect traffic incident road chain, detects traffic events actual influence scope according to described traffic incident road chain; Determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly.The present invention is directed to the deficiency that current traffic event information scope of release is determined, traffic event information dissemination method based on floating car data is proposed, in conjunction with floating car data own characteristic, propose the detection method of traffic events actual influence scope and the computing method of traffic event information issue spreading range, and then determine the traffic event information scope of release in each cycle.Traffic event information scope of release is according to the situation of change of traffic flow, and each cycle real-time update once.
Description
Technical field
The present invention relates to intelligent transportation field, particularly a kind of traffic event information dissemination method based on floating car data.
Background technology
Along with the develop rapidly in city, the sharply increase of road traffic demand, traffic congestion becomes the serious problems that each big city faces, and all kinds of traffic events brings larger pressure to limited road infrastructure.Reasonably traffic event information is distributed to the driver sailing for love scene, driver can be made to avoid love scene, or the traffic congestion region that event of avoiding is brought, thus effectively reduce the transport need at traffic events scene, improve love scene treatment effeciency, avoid second accident, alleviate traffic congestion, make the minimization of loss that traffic events causes.
Adopt advanced transportation information service systems, real time traffic data is obtained by data acquisition system (DAS), through overall treatment, predicting traffic flow, and issue real-time road condition information by network, broadcast, mobile phone, variable message board or on-vehicle navigation apparatus etc., guide driver's choose reasonable path, avoid traffic events coverage, become current study hotspot problem.In addition, Floating Car is the advanced technology means of the acquisition real-time road traffic information adopted in traffic information system in recent years, as compared to the point of fixity acquisition means such as traditional Road Detection technology and Video Supervision Technique, Floating Car has the advantages such as low cost, easily installation, easy care, measurement range are wide.Therefore, study based on the traffic event information dissemination method of floating car data and system significance great.
For traffic events coverage defining method, the application for a patent for invention of Chinese Patent Application No. 201110225774.0, " a kind of method for predicting grades of spatial effect ranges of traffic event effects on city expressways " by name provides a kind of method for predicting grades of spatial effect ranges of traffic event effects on city expressways.The method obtains a large amount of urban expressway traffic anomalous event case, subsequently case is divided at least two classes according to event space coverage, again using event space coverage as categorical attribute, all the other attributes are classified as judgement attribute, generate decision tree, subsequently, calculate the cluster centre value of each leaf node of decision tree, maximal value or minimum value, when traffic events occurs, judge that the data of attribute find corresponding leaf node in decision tree according to it, read the cluster centre value of this leaf node, maximal value or minimum value, the predicted value of spatial dimension grade is affected as traffic events.The attribute data that in this application for a patent for invention, each event case comprises is event type, weather conditions, events affecting number of track-lines, venue location bottleneck type, event lateral attitude occur, the need of towed vehicle, the need of ambulance, whether relate to oversize vehicle, event Location background traffic behavior, whether be in peak period and event space coverage.
The application for a patent for invention of Chinese Patent Application No. 201110358727.3, " a kind of defining method of highway emergent traffic incident coverage " by name provides a kind of defining method of highway emergent traffic incident coverage, relates to and is controlling completely accident occurs the basic freeway sections of coming in and going out.The method is based on the volume of traffic of detector acquisition upstream row track and incident point and density; Shock wave theory is utilized to calculate the velocity of wave of crowded ripple and affect length; What judge to draw affects length and whether exceeds the length of incident point to current upstream gateway ring road; Finally determine the coverage of accident.
Current traffic events coverage basis for forecasting several factors, as whether basis has oversize vehicle, the need of towed vehicle, ambulance, fire truck etc., event classified.But these factors cannot be obtained by floating vehicle data acquisition system and traffic event information text description, are very difficult specific, concrete at short notice, implement difficulty.In addition, the scope that traffic events affects the prediction of spatial dimension grade prediction technique is maximum effect scope, can not reflect the Spatial-Temporal Change Trend of the lower traffic flow of traffic events impact in real time.
In addition, the existing method utilizing traffic flow wave theory determination events affecting scope, the volume of traffic based on track, detector acquisition upstream and incident point and density, but take Floating Car as the information such as speed and quantity that the transportation information service systems of Data Source can only obtain Floating Car, cannot obtain the volume of traffic and the density of track, upstream and incident point, current events affecting range determining method cannot effectively be applied in the transportation information service systems based on floating car data.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of traffic event information dissemination method based on floating car data, for the coverage based on floating car data determination traffic events.
The invention provides a kind of traffic event information dissemination method based on floating car data, comprising:
Detect traffic incident road chain, detect traffic events actual influence scope according to described traffic incident road chain; Determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly.
The present invention is directed to the deficiency that current traffic event information scope of release is determined, traffic event information dissemination method based on floating car data is proposed, in conjunction with floating car data own characteristic, propose the detection method of traffic events actual influence scope and the computing method of traffic event information issue spreading range, and then determine the traffic event information scope of release in each cycle.Traffic event information scope of release is according to the situation of change of traffic flow, and each cycle real-time update once.
Accompanying drawing explanation
The dissemination method process flow diagram of the traffic event information based on floating car data that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the method flow diagram detecting traffic events actual influence scope in the embodiment of the present invention;
Fig. 3 is the schematic diagram of traffic event information scope of release in the embodiment of the present invention;
The traffic event information dissemination method that Fig. 4 provides for the embodiment of the present invention realize schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
The deficiency that the embodiment of the present invention is determined for current traffic event information scope of release, traffic event information dissemination method based on floating car data is proposed, in conjunction with floating car data own characteristic, propose the detection method of traffic events actual influence scope and the computing method of traffic event information issue spreading range, and then determine the traffic event information scope of release in each cycle.Traffic event information scope of release is according to the situation of change of traffic flow, and each cycle real-time update once.
Based on the traffic event information of floating car data dissemination method as shown in Figure 1, comprise the following steps:
Step 101, according to traffic event information text description and in real time floating car data, in combination diagram data, detect traffic incident road chain.Traffic incident road chain detection method is: in conjunction with traffic events character description information and floating car data, according to the velocity variations difference determination traffic incident road chain of upstream and downstream road chain.
Step 102, detect traffic events actual influence scope according to described traffic incident road chain.
Whether driver is concerned about whether road becomes and blocks up or slowly, can have an impact to his driving process; If the section of the event of generation, traffic is still unblocked, and driver can ignore this event.So the target of the embodiment of the present invention is not tell that traffic events occurs in driver front, but detect that traffic events produces block up and whether have an impact to driver, then tell driver, driver's selection that has ample time is detoured path.The standard of reflection events affecting is traffic congestion or slow.Category of roads is different, and the velocity range of blocking up is different.Definition traffic behavior: unimpeded, walk or drive slowly, block up, grade is respectively 1,2,3, as shown in the table:
Table 1
In table, FC represents category of roads, and v is travel speed.Represent the different directions that can lead to traffic incident road chain with m, represent the upstream road chain centered by traffic incident road chain with n, the concrete steps detecting traffic events actual influence scope as shown in Figure 2, comprising:
Step 1021, judge whether traffic incident road chain speed is unimpeded, if it is process ends; Otherwise continue to perform following steps.
Step 1022, initialization m=1, n=1.
Step 1023, obtaining can n-th article, upstream, m the direction road chain of exterior traffic event road chain.
Step 1024, judge the traffic behavior of the n-th article of road chain in described m direction, if traffic behavior is not less than the traffic behavior of event road chain, then n=n+1, performs step 1023; If traffic behavior is less than the traffic behavior of event road chain, then judge the traffic behavior of the (n+1)th article of road chain in m direction, if this traffic behavior is not less than the traffic behavior of event road chain, then n=n+1, performs step 1023; Otherwise, determine that (n-1)th article of road chain is that m direction affects border road chain in the most upstream in this cycle.
Step 1025, to judge whether each direction judges complete, if not then m=m+1, n=1; Otherwise this cycle traffic events actual influence range detection terminates.
Step 103, determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly.
Be defined into till obtaining traffic events character description information, the time that event has continued is t
0, occurring to from traffic events the duration that traffic events is disposed is t
last.Due to when obtaining traffic event information, the end time of traffic events can not be calculated from limited data, but As time goes on, system can detect the traffic events end time automatically, and then obtain the traffic events duration, therefore occur to from traffic events the duration t that traffic events is disposed
lastcomputing formula be:
t
last=t
0+α·T
Wherein α is integer, and T represents the floating car data sampling period.The traffic events end time is in (α-1) T the cycle after obtaining traffic events character description information and the some moment between the α T cycle: when (α-1) T cycle, systems axiol-ogy traffic events does not terminate; During α T cycle, systems axiol-ogy event terminates, then t
last=t
0+ α T.But data acquisition system (DAS) can not export the data of half period, judging whether traffic events terminates used data is complete cycles, so α is integer.
Definition
for vehicle drives to time needed for events affecting region with 75% bit rate, because incident duration directly reflects the size of event, determine the coverage of event, therefore,
value relevant with the time that event has continued, according to t
lastsize determine
value, specific as follows:
Wherein, t
1, t
2, t
3, t
4determine according to the empirical value that a large amount of historical data analysis obtains.
By the historical data of at least one month, the 75% bit rate v of road chain j at moment i can be obtained
75%(i, j) (all speed sorted from small to large, the speed come on the 75%th position is 75% bit rate.Calculating 75% bit rate is to obtain the speed larger than history average on the one hand, makes traffic event information issue spreading range and covers wider; On the other hand that the speed value that causes in order to avoid velocity perturbation is excessive).
Definition Length (j) represents the length of road chain j, Φ represents the most upstream road chain label of traffic events actual influence scope, Ω represents that the spreading range most upstream that traffic event information is issued affects border road chain label, and road chain label is from upstream to downstream and increases successively, as shown in Figure 3.
The spreading range L that traffic event information is issued
ei the computing formula of () is:
The spreading range that traffic event information is issued is obtained by the length sum of Duo Tiao road chain, and length meets condition below:
Wherein, s.t.(subjectto) be mathematic sign, the affined meaning, inequality below represents constraint condition.S.t. formula is below formula
qualifications, be used for judging the condition of spreading range demand fulfillment:
represent from the chain Ω of road with 75% bit rate traveling
time one arrives adjacent road, the upstream chain Φ-1 of road chain Φ surely;
represent from adjacent road, the upstream chain Ω-1 of road chain Ω with 75% bit rate traveling
time can not arrive adjacent road, the upstream chain Φ-1 of road chain Φ.Qualifications is mainly in order to find this border of chain Ω, road.
Determine that the method for the spreading range that traffic event information is issued specifically comprises the following steps:
Step 1031, judge whether traffic affects by traffic events, if do not had, then terminate; Otherwise the time t continued is detected according to floating car data
0, and be t
lastinitialize, t
last=t
0.
The extension length L that step 1032, calculating traffic event information are issued
e(i).
Step 1033, judge extension length L
ewhether there is the outlet arriving replaceable path in (i), if had, then determine that spreading range is L
e(i); If no, then upstream extend, until there are two outlets, and determine that the spreading range that current period traffic event information is issued is exit, upstream two.
Step 1034, renewal one-period, judge whether influenced traffic recovers normal, if recover normal, then terminates; If do not recovered, then whether decision event is disposed, if so, then and incident duration t
last=t
last-T; If event is not disposed, then t
last=t
last+ T, performs step 1032.
Wherein, determine that be disposed time and traffic of traffic events recovers the method for normal time and be:
One, traffic events is disposed, and traffic starts the determination methods recovered:
Definition of T S(i, j) for road chain j is at the traffic behavior of moment i, there is the road chain label of traffic events in link_incident, works as TS(i, j) meet below one of condition time, decision event is disposed, and influenced traffic starts to recover:
1, TS (i-1, link_incident) <TS (i-2, link_incident) and TS (i, link_incident) <TS(i-2, link_incident);
2, TS(i, link_incident-1) <TS(i-1, link_incident-1), and TS(i, link_incident) <TS(i-1, link_incident).
Two, traffic events affects the determination methods terminated completely: definition N
impi () is i moment event actual influenced road chain number, work as N
impduring (i)=0, judge that traffic events impact terminates completely.
Fig. 4 be the embodiment of the present invention realize schematic diagram, traffic event information scope of release is according to each cycle real-time update of the situation of change of traffic flow once.
The traffic event information dissemination method that the embodiment of the present invention proposes, floating car data and event information text description can be utilized, obtain the influenced scope of reality of traffic events, and the spreading range that estimated information is issued, solve the limitation that Floating Car cannot gather the data such as flow, density, expand the range of application of floating car data in traffic information issue field, for the application of Floating Car in traffic information issue field provides solid theoretical foundation and Technical Reference.In addition, consider the spreading range that traffic event information is issued, ensure that vehicle is when receiving event information, have ample time selection alternative route, reaches the effect of paths chosen.
In a word, the foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (4)
1., based on a traffic event information dissemination method for floating car data, it is characterized in that, comprising:
Detect traffic incident road chain, detect traffic events actual influence scope according to described traffic incident road chain; Determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly;
The step of described detection traffic incident road chain specifically comprises:
In conjunction with traffic events character description information and floating car data, according to the velocity variations difference determination traffic incident road chain of upstream and downstream road chain;
The step of described detection traffic events actual influence scope specifically comprises:
Arrange traffic behavior be unimpeded, walk or drive slowly, block up, grade is respectively 1,2,3; Represent the different directions that can lead to traffic incident road chain with m, represent the upstream road chain centered by traffic incident road chain with n, if traffic incident road chain speed is not smooth, then
A, initialization m=1, n=1;
B, obtaining can n-th article, upstream, m the direction road chain of exterior traffic event road chain;
C, judge the traffic behavior of the n-th article of road chain in described m direction, if traffic behavior is not less than the traffic behavior of event road chain, then n=n+1, performs step B; If traffic behavior is less than the traffic behavior of event road chain, then judge the traffic behavior of the (n+1)th article of road chain in m direction, if this traffic behavior is not less than the traffic behavior of event road chain, then n=n+1, performs step B; Otherwise, determine that (n-1)th article of road chain is that m direction affects border road chain in the most upstream in this cycle;
D, to judge whether each direction judges complete, if not then m=m+1, n=1; Otherwise this cycle traffic events actual influence range detection terminates;
Describedly determine that the step of the spreading range that traffic event information is issued specifically comprises:
A, be defined into and obtain traffic events character description information till, the time that traffic events has continued is t
0, occurring to from traffic events the duration that traffic events is disposed is t
last, then t
last=t
0+ α T, wherein α is integer, and T represents the floating car data sampling period;
B, to affect by traffic events when traffic, then detect t according to floating car data
0, and be t
lastinitialize, t
last=t
0;
The extension length L that c, acquisition traffic event information are issued
e(i);
D, judge described extension length L
ewhether there is the outlet arriving replaceable path in (i), if had, then determine that the spreading range that traffic event information is issued is L
e(i); Otherwise upstream extend, until there are two outlets, and determine that the spreading range that current period traffic event information is issued is exit, upstream two;
E, renewal one-period, judge whether influenced traffic recovers normal, if recover normal, then terminates; Otherwise judge whether traffic events is disposed, if so, then traffic events duration t
last=t
last-T; If traffic events is not disposed, then t
last=t
last+ T, performs step c.
2. the traffic event information dissemination method based on floating car data according to claim 1, is characterized in that, the extension length L that described acquisition traffic event information is issued
ei the step of () specifically comprises:
Definition
for vehicle drives to time needed for traffic events range of influence with 75% bit rate,
value be:
Wherein, t
1, t
2, t
3, t
4determine according to the empirical value that historical data analysis obtains; By the historical data of at least one month, obtain the 75% bit rate v of road chain j at moment i
75%(i, j);
Definition Length (j) represents the length of road chain j, Φ represents the most upstream road chain label of traffic events actual influence scope, Ω represents that the spreading range most upstream that traffic event information is issued affects border road chain label, and road chain label is from upstream to downstream and increases successively;
Then,
Length meets condition below:
3. the traffic event information dissemination method based on floating car data according to claim 2, is characterized in that, describedly judges whether influenced traffic recovers normal step and specifically comprise:
Definition N
impi () is i moment traffic events actual influenced road chain number, work as N
impduring (i)=0, judge that influenced traffic recovers normal.
4. the traffic event information dissemination method based on floating car data according to claim 2, is characterized in that, the described method judging whether traffic events is disposed specifically comprises:
Definition of T S (i, j) is for road chain j is at the traffic behavior of moment i, and the road chain label of traffic events occurs link_incident, when below TS (i, j) meets during one of condition, judges that traffic events is disposed:
TS (i-1, link_incident) <TS (i-2, link_incident), and TS (i, link_incident) <TS (i-2, link_incident);
TS (i, link_incident-1) <TS (i-1, link_incident-1), and TS (i, link_incident) <TS (i-1, link_incident).
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| CN1976296A (en) * | 2006-12-25 | 2007-06-06 | 北京世纪高通科技有限公司 | Method and system for real-time dynamic traffic information collecting, handling, and issuing |
| CN102289933A (en) * | 2011-08-08 | 2011-12-21 | 上海电科智能系统股份有限公司 | Method for predicting grades of spatial effect ranges of traffic event effects on city expressways |
| CN102496264A (en) * | 2011-11-11 | 2012-06-13 | 东南大学 | Method capable of determining influence scope of highway emergent traffic incident |
| CN102622885A (en) * | 2012-03-22 | 2012-08-01 | 北京世纪高通科技有限公司 | Method and device for detecting traffic incidents |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006023886A (en) * | 2004-07-07 | 2006-01-26 | Nissan Motor Co Ltd | Traffic information system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1976296A (en) * | 2006-12-25 | 2007-06-06 | 北京世纪高通科技有限公司 | Method and system for real-time dynamic traffic information collecting, handling, and issuing |
| CN102289933A (en) * | 2011-08-08 | 2011-12-21 | 上海电科智能系统股份有限公司 | Method for predicting grades of spatial effect ranges of traffic event effects on city expressways |
| CN102496264A (en) * | 2011-11-11 | 2012-06-13 | 东南大学 | Method capable of determining influence scope of highway emergent traffic incident |
| CN102622885A (en) * | 2012-03-22 | 2012-08-01 | 北京世纪高通科技有限公司 | Method and device for detecting traffic incidents |
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