CN105096592B - Highway congestion event detecting method and early warning system - Google Patents
Highway congestion event detecting method and early warning system Download PDFInfo
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- CN105096592B CN105096592B CN201510079698.5A CN201510079698A CN105096592B CN 105096592 B CN105096592 B CN 105096592B CN 201510079698 A CN201510079698 A CN 201510079698A CN 105096592 B CN105096592 B CN 105096592B
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Abstract
The invention discloses a kind of highway congestion event detection and early warning system, and it can quickly realize the differentiation and early warning of traffic congestion, alarm is sent in the very first time.Present invention also offers a kind of highway congestion event detecting method, when by vehicle, it is embedded in signal caused by two induction installations of certain intervals before and after highway section by obtaining the cross sectional area jam situation is judged, the detection efficiency of congestion event can be improved by using this method, to obtain more rapidly accurate testing result.This case includes following beneficial effect：1) the brand-new highway congestion event method for early warning of innovative design；2) early warning can be carried out incessantly, improve the promptness and continuity of early warning；3) improve accuracy of detection and do sth. in advance congestion event discovery time.
Description
Technical field
Vehicle is gathered around the present invention relates to a kind of detection method used under highway jam situation and using the detection method
Stifled situation carries out pre-warning system.
Background technology
After highway is built up, with being continuously increased for vehicle flowrate, traffic congestion event occurs often, and thus exist and trigger system
The hidden danger of row traffic accident.And as vehicle number explosive growth in recent years, traffic jam issue are brought to highway administration person
Huge pressure.
Detection roadway congestion event methods are single both at home and abroad at present, and early warning dynamics is weaker, and single method often has spy
The problem of different situation can't detect, causes early warning not in time.Therefore how to utilize rational means progress highway congestion event detection
With early warning there is highly important Research Significance and practice to be worth.
The research of many highway congestion events outside Current Domestic rests on theoretic, opposite with practical application request
From the requirement of detection of the highway administration person to congestion event can not be well adapted for.
Therefore, how to design it is a kind of can fast reaction Current traffic congestion status and cost it is low traffic congestion it is pre-
Alert technology is the key issue of urban traffic blocking research instantly.
The content of the invention
It is an object of the invention to solve at least the above and/or defect, and provide at least will be described later it is excellent
Point.
A further object of the invention is that the efficiency of detection is improved by highway congestion event detecting method, to obtain
More rapidly accurate testing result.
It is a still further object of the present invention to provide a kind of highway congestion event early warning system, and it can quickly realize that traffic is gathered around
Stifled differentiation and early warning, alarm is sent in the very first time.
In order to realize according to object of the present invention and further advantage, there is provided a kind of highway congestion event detection side
Method, (when by vehicle, signal pair caused by two induction installations of certain intervals is embedded in before and after highway section by obtaining
The cross sectional area jam situation is judged), comprise the following steps：
Step 1: the first induction installation before the track section of highway one and after section described in the track
Two induction installations produce signal to the vehicle of process successively, and first induction installation is with second induction installation at intervals of l；
It is connected Step 2: carrying out wired or wireless communication respectively with first induction installation and second induction installation
Signal processing module handled by the signal launched first induction installation and second induction installation, obtain
First induction installation described in when vehicle enters the first induction installation induction range produces the time t of signala, vehicle leave institute
First induction installation described in when stating the first induction installation induction range produces the time t of signalb, vehicle enter described second sensing
Second induction installation described in during device induction range produces the time t of signalcAnd leave the second induction installation induction range
Second induction installation of Shi Suoshu produces the time t of signald；And
Step 3: determination module is connected for institute with the signal processing module by wired or wireless communication mode
State ta、tb、tcAnd tdHandled, draw decision content, the determination module is compared the decision content and the given threshold
Compared with judgement starts warning device or repeats step 1.
Preferably, wherein, l is 1~50m.
Preferably, wherein, the determination module is to the ta、tb、tcAnd tdHandled, drawn according to formula group one
Unit period T0It is interior, average running speed when vehicle is run between first induction installation and second induction installationAnd signal averaging time occupancy
The formula group one includes：
1) average running speedProcessing procedure：One car passes through the time difference of two sensorses
Speed vi=li/Δti、
2) signal averaging time occupancyProcessing procedure：Unit period T0Interior, n car is in the described first sensing dress
Put and second induction installation between run when single sensor signal continue total time
For：
Then signal time occupation rate(T0For the unit time), so as to draw signal averaging time occupancy
The determination module is by the unit period T after processing0Interior, vehicle is in first induction installation and the described second sense
Answer average running speed during operation between deviceAnd signal averaging time occupancyCompared with given threshold：
Work as the speed of serviceLess than the threshold speedAnd signal averaging time occupancyMore than the threshold value of settingThen judge traffic congestion be present；
Work as the speed of serviceMore than the threshold speed of settingAnd/or signal averaging time occupancyLess than setting
Threshold valueWhen, then judge traffic congestion is not present.
Preferably, wherein, when evaluation congestion number of track-lines M reach given threshold mα(1≤mα≤ m) when, then judge section
Congestion anomalous event be present, and send alarm, otherwise re-execute step 1；Wherein, the unidirectional section runway number of highway is m.
Preferably, wherein, the determination module passes through to the ta、tb、tcAnd tdHandled, draw the section
Locate the average speed in i-th of cycleI-th of cycle and the absolute value of the average speed difference in preceding n (n=1,2,3...) individual cycleAnd the absolute value of signal averaging time occupancy differenceThe determination module is by i-th of cycle after processing
Average speedThe absolute value of signal averaging time occupancy differenceAnd the absolute value of average speed differenceWith setting
Threshold value is compared：
When the average speed in i-th of cycleLess than given threshold Bβ, average speed difference absolute valueMore than setting
Threshold value Δ VβAnd the absolute value of signal averaging time occupancy differenceMore than given thresholdWhen, judge that road conditions occur
Congestion has anomalous event, and starts warning device.
The decision method of above two determination module both can be used alone in a system, can also be used in conjunction with one
In individual system.
The purpose of the present invention can also be gathered around further by a kind of more sections using above-mentioned highway congestion event detecting method
Stifled detection method realization, wherein, when by vehicle, it is embedded in two sections of certain intervals on highway respectively by obtaining
Signal is judged two cross sectional area jam situation caused by two inductive components, is comprised the following steps：
Step 1, the first inductive component located at the first section of highway j and the second sensing located at the second section of highway j-1
Component produces signal to the vehicle of process successively, and the first section j and the second section j-1 spacing are LJ, j-1, LJ, j-1For 200
~3000m；
Step 2, wired or wireless communication is carried out respectively with first inductive component and second inductive component is connected
Signal processing module handled by the signal obtained to first inductive component and second inductive component, obtain
Vehicle passes through time parameter when first inductive component and second inductive component；And
The time parameter is sent to determination module and handled by step 3, the signal processing module, with described in acquisition
The absolute value delta V of first section j and the second section j-1 speed differenceJ, j-1, occupation rate difference absolute valueAnd difference in flow
Absolute value delta NJ, j-1, the determination module is absolute by the first section j after processing and the second section j-1 speed difference
It is worth Δ VJ, j-1, occupation rate difference absolute valueAnd the absolute value delta N of difference in flowJ, j-1Compared with given threshold：
As highway the first section j and highway the second section j-1 speed difference Δs VJ, j-1More than given threshold Δ Vχ, absolute value accounts for
There is rate poorMore than given threshold Δ OccχAnd difference in flow Δ NJ, j-1More than given threshold Δ NχWhen, then judge that road conditions are present
Congestion or anomaly, start warning device.
In order to realize objectives and other advantages of the present invention, additionally provide a kind of using above-mentioned highway congestion event detection side
The highway congestion event early warning system of method, including,
Sensing unit, including at least two groups of inductive components, each inductive component include the first induction installation and second
Induction installation, it is 1~50m that first induction installation and second induction installation, which set spacing, two adjacent groups inductive component
Spacing is 200~3000m；
Signal processing module, it is connected with the sensing unit using wired or wireless communication mode, to obtain the sense
Answer time parameter caused by unit transmission signal；
Determination module system, the determination module system are included with the signal processing module respectively by wired or wireless
Determination module one, determination module two and the determination module three of communication mode connection, the determination module one, determination module two and sentence
Cover half block three is handled the time parameter to obtain different decision value, the determination module one, determination module two and judgement
Module three determines whether to send pre-warning signal respectively by the decision content compared with given threshold；And
Warning device, with the determination module one, determination module two and determination module three respectively by wired or wireless logical
Letter mode connects, and the warning device reception determination module one, determination module two or the determination module three send described pre-
Alert signal simultaneously makes alarm response.
Preferably, wherein, described a pair of speeds of service of determination moduleAnd signal averaging time occupancySentenced
It is fixed；Average speed of the determination module two to i-th of cycleThe absolute value of signal averaging time occupancy difference
And the absolute value of average speed differenceJudged；The determination module three is to the first section j and the second section j-1
Speed difference absolute value delta VJ, j-1, occupation rate difference absolute valueAnd the absolute value delta N of difference in flowJ, j-1Judged.
Preferably, wherein, the induction installation is wireless senser, coil, laser or video.
Preferably, wherein, the induction installation is type wireless geomagnetic sensor.
The present invention comprises at least following beneficial effect：1) the brand-new highway congestion event method for early warning of innovative design, base
Compared in the speed of service and time occupancy of vehicle, and with relevant national standard, early warning is carried out according to comparative result；2)
In the solution of the present invention, each parameter, quantity of state continuous updating, early warning can be carried out incessantly, improve promptness and the company of early warning
Continuous property；3) highway congestion event early warning system provided by the invention is found congestion within the very first time, passed through by Comprehensive Evaluation
Single detection profile data combines comprehensive distinguishing with adjacent detection profile data contrast, improves accuracy of detection and has done sth. in advance congestion thing
Part discovery time.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is highway congestion event early warning system workflow schematic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
Fig. 1 shows a kind of way of realization according to the present invention, shows the highway congestion event early warning system course of work.
Including：
(1) sensing unit, including at least two groups of inductive components, each inductive component include the first induction installation and the
Two induction installations, it is 1~20m that first induction installation and second induction installation, which set spacing, two adjacent groups sense group
Part spacing is 200~3000m, wherein before the first induction installation is located at highway section, and the second induction installation is located at described disconnected
Behind face, first induction installation produces signal to the vehicle of process successively with second induction installation；
The induction installation can be wireless senser, coil, laser or video or with wireless senser, line
Enclose, the sensing device that laser or video principle are similar, however it is not limited to above-mentioned four kinds of induction installations.
Highway referred to herein can be common road or urban express way or highway, and be not limited to
Several highways listed herein.
Preferably a kind of mode is：Traffic congestion data can be adopted by the type wireless geomagnetic sensor in highway
Collection.The such scheme of the present embodiment, when applying on a highway, existing camera supervised column can also be utilized to provide equipment
Power supply and communications, it is cost-effective without extra laying.
(2) signal processing module, it is connected with the sensing unit using wired or wireless communication mode, it is described to obtain
Time parameter caused by sensing unit transmission signal；Carried out respectively with first induction installation and second induction installation
The signal processing module of wired or wireless communication connection is by launching first induction installation and second induction installation
Signal handled, obtain the first induction installation generation signal described in when vehicle enters the first induction installation induction range
Time ta, vehicle first induction installation described in when leaving the first induction installation induction range produce the time t of signalb, car
Second induction installation described in during entrance the second induction installation induction range produces the time t of signalaAnd leave described
Second induction installation produces the time t of signal described in during two induction installation induction rangesd；
(3) determination module system, the determination module system include with the signal processing module respectively by wired or
Determination module one, determination module two and the determination module three of communication connection, the determination module one, determination module two
And determination module three is handled to obtain different decision value to the time parameter, the determination module one, determination module two and
Determination module three determines whether to send pre-warning signal, specific embodiment party respectively by the decision content compared with given threshold
Method is as follows：
Determination module system is connected for described with the signal processing module by wired or wireless communication mode
ta、tb、tcAnd tdHandled, draw decision content, the determination module system carries out the decision content and the given threshold
Compare, determine whether congestion；
1. determination module one：To the ta、tb、tcAnd tdHandled according to formula group one, draw unit period T0It is interior, car
Average running speed when running between first induction installation and second induction installationAnd the signal averaging time
Occupation rate
The formula group one includes：
1) average running speedProcessing procedure：One car passes through the time difference of two sensorses
Speed vi=li/Δti、
2) signal averaging time occupancyProcessing procedure：Unit period T0Interior, n car is in the described first sensing dress
Put and second induction installation between run when single sensor signal continue total time
For：
Then signal time occupation rate(T0For the unit time), so as to draw signal averaging time occupancy
The determination module one is by the unit period T after processing0Interior, vehicle is in first induction installation and described second
Average running speed when being run between induction installationAnd signal averaging time occupancyCompared with given threshold：
Work as the speed of serviceLess than the threshold speedAnd signal averaging time occupancyMore than the threshold value of settingThen judge traffic congestion be present；
Work as the speed of serviceMore than the threshold speed of settingAnd/or signal averaging time occupancyLess than setting
Threshold valueWhen, then judge traffic congestion is not present.
2. determination module two：By to the ta、tb、tcAnd tdHandled, draw i-th cycle of the section part
Average speedI-th of cycle and the absolute value of the average speed difference in preceding n (n=1,2,3...) individual cycleAnd signal is put down
The absolute value of equal time occupancy differenceThe determination module is by the average speed in i-th of cycle after processingLetter
The absolute value of number average time occupation rate differenceAnd the absolute value of average speed differenceCompared with given threshold：
When the average speed in i-th of cycleLess than given threshold Vβ, average speed difference absolute valueMore than setting
Threshold value Δ VβAnd the absolute value of signal averaging time occupancy differenceMore than given thresholdWhen, judge that road conditions occur
Congestion has anomalous event.
3. determination module three at a distance of the jam situation of two section parts for 200~3000m to judging：
Step 1, the first inductive component located at the first section of highway j and the second sensing located at the second section of highway j-1
Component produces signal to the vehicle of process successively, and the first section j and the second section j-1 spacing are LJ, j-1, LJ, j-1For 200
~3000m；
Step 2, wired or wireless communication is carried out respectively with first inductive component and second inductive component is connected
Signal processing module handled by the signal obtained to first inductive component and second inductive component, obtain
Vehicle passes through time parameter when first inductive component and second inductive component；
The time parameter is sent to determination module three and handled by step 3, the signal processing module, to obtain
State the absolute value delta V of the first section j and the second section j-1 speed differenceJ, j-1, occupation rate difference absolute valueAnd flow
The absolute value delta N of differenceJ, j-1, the determination module three is by the first section j after processing and the second section j-1 speed difference
Absolute value delta VJ, j-1, occupation rate difference absolute valueAnd the absolute value delta N of difference in flowJ, j-1Compared with given threshold：
As highway the first section j and highway the second section j-1 speed difference Δs VJ, j-1More than given threshold Δ Vχ, absolute value accounts for
There is rate poorMore than given threshold Δ OccχAnd difference in flow Δ NJ, j-1More than given threshold Δ NχWhen, then judge that road conditions are present
Congestion or anomaly.
And
(4) warning device, with the determination module one, determination module two and determination module three respectively by wired or wireless
Communication mode connects, and the warning device reception determination module one, determination module two or the determination module three send described
Pre-warning signal simultaneously makes alarm response, is gathered around when the determination module one, determination module two or determination module three judge that road conditions are present
During stifled or anomaly, warning device automatic start is alarmed.
Wherein, determination module one, determination module two and determination module three can individually be implemented also side by side to implement, when independent real
Determination module is applied for the moment, when the number of track-lines M of evaluation congestion reaches given threshold mα(1≤mα≤ m) when, then judge that section is present and gather around
Stifled anomalous event, and alarm is sent, otherwise re-execute step 1；Wherein, the unidirectional section runway number of highway is m.
And determination module one, determination module two or determination module three can enter row major judgement, example in varied situations respectively
Such as：
Situation one：When rear crash event, which occurs, for unidirectional three-lane highway causes that wherein a track can not pass through, vehicle congestion
More slight, the change of the congestion order of severity is slow, congestion upstream and downstream information of vehicles difference also unobvious, now using trend discrimination
Determination module two and the determination module three of upstream and downstream data comparison be all not easy detection accidents happened, the corresponding ginseng of determination module one
The differentiation of number threshold value can detect congestion event well.
Situation two：When highway congestion variation tendency is larger, the method for discrimination of determination module two easily reaches threshold value.For example,
50km/h is dropped to by 100km/h in the section of expressway speed short time.A kind of situation then be present, speed 50km/h does not reach
To the given threshold of determination module one, but velocity variations difference 50km/h has reached the given threshold of determination module two, and the time is occupied
Rate parameter etc. is similarly, then when determination module one, determination module three also do not determine congestion, determination module two just can be to congestion
Anomalous event carries out detecting differentiation and sends alarm.
Situation three：When two detection section spacing are larger, such as the detection section intermediate point at a distance of 2km occurs more serious
Lorry rollover event, cause unidirectional track all impassable, jam situation is serious and degradating trend is larger, but detect section
Point occurs farther out (about 1km) from accident, it is determined that module one, determination module two can not detect congestion exception thing in time
Part.Upstream detection section still has vehicle to drive towards accident to occur point, and (or few without vehicle in the detected downstream section short time
Vehicle) by the way that the parameter such as time occupancy, speed is similarly analyzed.So after certain parameter threshold value is met, determination module three can
Full out detect congestion anomalous event.
In order to allow highway administration person's very first time to find congestion event, three determination module paired runnings, and any one sentence
Cover half block sends early warning after being determined as congestion or anomalous event, and the valuable emergency management and rescue time is saved for manager.
Induction installation quantity described herein and treatment scale are the explanations for simplifying the present invention.To the public affairs of the present invention
The application of road congestion event early warning system, modifications and variations will be readily apparent to persons skilled in the art.
, can present invention aims at a kind of highway traffic congestion event method of discrimination, device and early warning system is provided
The quick differentiation and early warning for realizing traffic congestion, alarm is sent in the very first time.
The above-mentioned purpose of the present invention realized by the technical characteristics of independent claims, and dependent claims are with alternative or have
The mode of profit develops the technical characteristic of independent claims.
To reach above-mentioned purpose, the present invention uses embodiments below：
A kind of highway traffic congestion method for early warning, comprises the following steps：
Determination module one：Step 1, acquisition are embedded in two ground of certain intervals l before and after a certain track of section of expressway
Magnetic Sensor caused pulse signal when vehicle passes through；
When step 2, first sensor into/out based on vehicle acquired in step 1 during changes of magnetic field pulse signal
Between ta/tbAnd time pulse signal t is produced during into/out second sensorc/td；
Step 3, based on steps 1 and 2, calculate each car is by the time difference of two sensorsesCar
Fast vi=li/ΔtiWith vehicle by the time shared by sensor(vehicle i enters and leaves sensor
Triggered time it is poor)；
Step 4, electric pulse quantity n (vehicle number for passing through sensor) according to caused by magnetic field in the default time cycle,
Unit of account time T0The average running speed of the interior track vehicleContinue total time T with signal, (vehicle take sensor is total
Time) wherein：
Step 5, according to signal continue calculate the track vehicle total time T in unit period T0Interior time occupancy
occ：
Then unit period T0Interior signal averaging time occupancy：
Step 6, the average speed according to the vehicle for detecting section trackWith signal averaging time occupancyIt is whether same
When reach threshold value to judge whether the highway track is congestion.
If the track speed of serviceMore than the threshold speed of settingOr signal averaging time occupancyIt is less than
The threshold value of settingThen judge that the track is unobstructed；
If the track speed of serviceLess than the threshold speed of foregoing settingAnd signal averaging time occupancyGreatly
In the threshold value of settingThen judge the track congestion.
Step 7: according to the unidirectional section runway number m of highway, setting section congestion decision threshold mα(1≤mα≤ m),
When the number of track-lines m of evaluation congestion reaches threshold value mαWhen, that is, judge that section has congestion anomalous event, and alarm is sent, otherwise return
Return step 1.
Determination module two：
Step 1, according to unit period T0Signal averaging time occupancyCalculate current period i signal averaging
Time occupancyWith the individual cycle i-n signal averaging time occupancies of preceding n (n=1,2,3 ...)Absolute value occupation rate
Difference
Step 2, according to current section cycle i and the i-n of preceding n section average speed Calculate detection section
The absolute value speed difference of period velocity
Step 3, when i-th cycle of section meet that absolute value occupation rate is poor simultaneouslyMore than given threshold
Absolute value speed differenceMore than given threshold Δ Vβ, cycle i average speedLess than given threshold VβWhen, judge that road conditions go out
Existing congestion has anomalous event.
Determination module three：
Step 1, two spacing are LJ, j-1Detection section j and j-1, wherein section j current periods average speed is
Signal averaging time occupancy isVehicle flowrate is nj, section j-1 current period average speeds areThe signal averaging time
Occupation rate isVehicle flowrate is nj-1, calculate two detection section absolute value speed difference Δ VJ, j-1, absolute value occupation rate it is poorAbsolute value difference in flow Δ NJ, j-1；
Step 2, when two detect section speed difference Δ VJ, j-1More than given threshold Δ Vχ, absolute value occupation rate it is poorMore than given threshold Δ Occχ, difference in flow Δ NJ, j-1More than given threshold Δ NχWhen, then judge road conditions exist congestion or
Anomaly.
In order to allow freeway management person's very first time to find congestion event, three determination modules be arbitrarily determined as congestion or
Early warning is sent after anomalous event, the valuable emergency management and rescue time is saved for manager.
In order to know more about the technology contents of the present invention, especially exemplified by specific embodiment and institute's accompanying drawings are coordinated to be described as follows.
As shown in figure 1, according to the preferred embodiment of the present invention, a kind of highway traffic congestion method for early warning, it is realized
Comprise the following steps：
Determination module one：Step 1, obtain the number collected by geomagnetic sensor when vehicle passes through i-th of section of highway
According to wherein front and rear certain intervals l two wireless sensers caused pulse signal when vehicle passes through；
When step 2, first sensor into/out based on vehicle acquired in step 1 during changes of magnetic field pulse signal
Between ta/tbAnd time pulse signal t is produced during into/out second sensorc/td；
Step 3, based on steps 1 and 2, calculate each car is by the time difference of two sensorsesCar
Fast vi=li/ΔtiWith vehicle by the time shared by sensor(vehicle i enters and leaves sensor
Triggered time it is poor)；
Step 4, electric pulse quantity n (vehicle number for passing through sensor) according to caused by magnetic field in the default time cycle,
Unit of account time T0The average running speed of interior vehicleContinue total time T with signal, (vehicle take sensor total time)
Wherein：
Step 5, according to signal continue calculate vehicle total time T in unit period T0Interior time occupancy occ：
Then unit period T0Interior signal averaging time occupancy：
Step 6, the average speed according to detection section vehicleWith signal averaging time occupancyWhether reach simultaneously
Threshold value judges whether highway gets congestion.
If the speed of serviceMore than the threshold speed of settingOr signal averaging time occupancyLess than setting
Threshold value Occα, then judge traffic congestion is not present, return to abovementioned steps 1；
If the speed of serviceLess than the threshold speed of foregoing settingAnd signal averaging time occupancyIt is more than
The threshold value Occ of settingα, then judge traffic congestion be present.
Determination module two：
Step 1, according to unit period T0Signal averaging time occupancyThenCalculate current
Cycle i time occupancyWith upper cycle i-1 time occupancyDifference
Step 2, step 2, the average speed according to section adjacent periods i, i-1 Calculate detection section cycle speed
The difference of degree
Step 3, when occupation rate differenceMore than given threshold Δ Oβ, speed differenceMore than given threshold Δ
Vβ, current period average speedLess than given threshold VβWhen, judge that road conditions congestion occur or have anomalous event.
Determination module three：
Step 1, two spacing are LJ, j-1Detection section j and j-1, wherein section j current periods average speed is
Signal averaging time occupancy isVehicle flowrate is nj, section j-1 current period average speeds areThe signal averaging time
Occupation rate isVehicle flowrate is nj-1, calculate two detection section absolute value speed difference Δ VJ, j-1, absolute value occupation rate it is poor
ΔOccJ, j-1, absolute value difference in flow Δ NJ, j-1；
Step 2, when two detect section speed difference Δ VJ, j-1More than given threshold Δ Vχ, occupation rate difference Δ OccJ, j-1It is more than
Given threshold Δ Occχ, difference in flow Δ NJ, j-1More than given threshold Δ NχWhen, then judge that road conditions have congestion or anomaly.
In three kinds of determination modules, because the type of all kinds of congestion events is different, influence when congestion occurs to traffic is poor
It is other also very big.Such as：
(1) when rear crash event, which occurs, for unidirectional three lanes highway causes that wherein a track can not pass through, vehicle congestion
More slight, the change of the congestion order of severity is slow, congestion upstream and downstream information of vehicles difference also unobvious, now using trend discrimination
Determination module two and the determination module three of upstream and downstream data comparison be all not easy detection accidents happened, the corresponding ginseng of determination module one
The differentiation of number threshold value can detect congestion event well.
(2) when highway congestion variation tendency is larger, the method for discrimination of determination module two easily reaches threshold value.For example,
50km/h is dropped to by 100km/h in the section of expressway speed short time.A kind of situation then be present, speed 50km/h does not reach
To the given threshold of determination module one, but velocity variations difference 50km/h has reached the given threshold of determination module two, and the time is occupied
Rate parameter etc. is similarly, then when determination module one, determination module three also do not determine congestion, determination module two just can be to congestion
Anomalous event carries out detecting differentiation and sends alarm.
(3) when two detection section spacing are larger, such as more serious goods occurs for the detection section intermediate point at a distance of 2km
Car rollover event, cause unidirectional track all impassable, jam situation is serious and degradating trend is larger, but detects thing in section
Therefore point occurs farther out (about 1km), it is determined that module one, determination module two can not detect congestion anomalous event in time.On
Trip detection section still has vehicle to drive towards accident generation point, and without vehicle (or few vehicle) in the detected downstream section short time
By the way that the parameter such as time occupancy, speed is similarly analyzed.So after certain parameter threshold value is met, determination module three can be most fast
Ground detects congestion anomalous event.
In order to allow freeway management person's very first time to find congestion event, three determination modules be arbitrarily determined as congestion or
Early warning is sent after anomalous event, the valuable emergency management and rescue time is saved for manager.
With reference to shown in Fig. 1, the method for early warning that is used in the present embodiment, the speed of service and time occupancy based on vehicle,
Section vehicle flowrate difference, adjacent periods speed difference, adjacent periods occupation rate difference, adjacent sections speed difference, adjacent sections
The information such as occupation rate difference, and (such as can be embodied with relevant national standard by the appropriate threshold value of setting, different high speeds is public
There is different standards on road, therefore can be directed to different situations and set different threshold values) compare, carried out according to comparative result pre-
It is alert, on the one hand by parameters comprehensive distinguishing, calculate and accuracy of judgement degree is high, can reach the business promotion application of pinpoint accuracy
Standard, on the other hand, by continuous acquisition and real-time judge, it can reach the effect of real-time early warning.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With.It can be applied to various suitable the field of the invention completely., can be easily for those skilled in the art
Realize other modification.Therefore it is of the invention and unlimited under the universal limited without departing substantially from claim and equivalency range
In specific details and shown here as the legend with description.
Claims (7)
1. a kind of highway congestion event detecting method, when by vehicle, it is embedded in by obtaining before and after highway section necessarily
Signal caused by the induction installation at interval is judged the cross sectional area jam situation, is comprised the following steps：
Step 1: the first induction installation before the track section of highway one and the second sense after section described in the track
Device is answered to produce signal to the vehicle of process successively, first induction installation is with second induction installation at intervals of l；
Step 2: the letter that wired or wireless communication is connected is carried out respectively with first induction installation and second induction installation
Number processing module is handled by the signal launched first induction installation and second induction installation, obtains vehicle
The time t of signal is produced into the first induction installation described in during the first induction installation induction rangea, vehicle leave described
First induction installation described in during one induction installation induction range produces the time t of signalb, vehicle enter second induction installation
Second induction installation described in during induction range produces the time t of signalcAnd leave the second induction installation induction range when institute
State the time t that the second induction installation produces signald；And
Step 3: determination module is connected for the t with the signal processing module by wired or wireless communication modea、
tb、tcAnd tdHandled, draw decision content, the decision content compared with given threshold, is judged to open by the determination module
Dynamic warning device repeats step 1；
The determination module is to the ta、tb、tcAnd tdHandled according to formula group one, draw unit period T0Interior, vehicle exists
Average running speed when being run between first induction installation and second induction installationAnd the signal averaging time is occupied
Rate
The formula group one includes：
1) average running speedProcessing procedure：I-th car passes through the time difference of two sensorsesSpeed
vi=li/△ti、Wherein n represents vehicle fleet amount；
2) signal averaging time occupancyProcessing procedure：Unit period T0Interior, n car is in first induction installation and institute
The signal of single sensor continues total time and is when stating operation between the second induction installation：
<mfenced open = "" close = "">
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<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
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<mover>
<mi>t</mi>
<mo>&OverBar;</mo>
</mover>
<mi>i</mi>
</msub>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
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<mover>
<mi>t</mi>
<mo>&OverBar;</mo>
</mover>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>t</mi>
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</msub>
<mo>-</mo>
<msub>
<mi>t</mi>
<mi>a</mi>
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<msub>
<mi>t</mi>
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<msub>
<mi>t</mi>
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</mrow>
<mn>2</mn>
</mfrac>
<mo>,</mo>
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</mtr>
</mtable>
</mfenced>
Then signal time occupation rateWherein, T0For the unit time,Represent i-th car in first induction installation
And the signal of single sensor continues average time when being run between second induction installation, so as to draw the signal averaging time
Occupation rate
The determination module is by the unit period T after processing0Interior, vehicle fills in first induction installation and the described second sensing
Average running speed when being run between puttingAnd signal averaging time occupancyCompared with given threshold：
Work as the speed of serviceLess than the threshold speed of settingAnd signal averaging time occupancyMore than the threshold value of setting
Then judge that the track has traffic congestion；
Work as the speed of serviceMore than the threshold speed of settingAnd/or signal averaging time occupancyLess than the threshold value of settingWhen, then judge traffic congestion is not present；
When the number of track-lines M of evaluation congestion reaches given threshold mαWhen, wherein, 1≤mα≤ m, then judge that section has congestion exception thing
Part, and alarm is sent, otherwise re-execute step 1；Wherein, the unidirectional section runway number of highway is m；
The determination module passes through to the ta、tb、tcAnd tdHandled, draw the average speed in i-th of cycle of section part
DegreeI-th of cycle and the absolute value of the average speed difference in preceding n cycleAnd signal averaging time occupancy difference is exhausted
To valueWherein, n=1,2,3 ..., the determination module is by the average speed in i-th of cycle after processingSignal
The absolute value of average time occupation rate differenceAnd the absolute value of average speed differenceCompared with given threshold：
When the average speed in i-th of cycleLess than given threshold Vβ, average speed difference absolute valueMore than given threshold
△VβAnd the absolute value of signal averaging time occupancy differenceMore than given thresholdWhen, judge that congestion occur in road conditions
Or have anomalous event, and start warning device.
2. highway congestion event detecting method as claimed in claim 1, wherein, l is 1~50m.
3. a kind of more section congestion detection methods of highway congestion event detecting method using described in claim 1, wherein, when
During by vehicle, by obtaining signal caused by two inductive components of two sections for being embedded in certain intervals on highway respectively
Two cross sectional area jam situation is judged, comprised the following steps：
Step 1, the first inductive component located at the first section of highway j and the second inductive component located at the second section of highway j-1
Signal is produced to the vehicle of process successively, the first section j and the second section j-1 spacing are Lj,j-1, Lj,j-1For 200~
3000m；
Step 2, carry out the letter that wired or wireless communication is connected respectively with first inductive component and second inductive component
Number processing module is handled by the signal obtained to first inductive component and second inductive component, obtains vehicle
By time parameter when first inductive component and second inductive component；And
The time parameter is sent to determination module and handled by step 3, the signal processing module, to obtain described first
The absolute value △ V of section j and the second section j-1 speed differencej,j-1, occupation rate difference absolute valueAnd difference in flow is exhausted
To value △ Nj.j-1, the determination module is by the first section j and the absolute value △ of the second section j-1 speed difference after processing
Vj,j-1, occupation rate difference absolute valueAnd the absolute value △ N of difference in flowj.j-1Compared with given threshold：
As highway the first section j and highway the second section j-1 speed difference △ Vj,j-1More than given threshold △ Vχ, absolute value occupation rate
DifferenceMore than given threshold △ OccχAnd difference in flow △ Nj.j-1More than given threshold △ NχWhen, then judge that road conditions are present and gather around
Stifled or anomaly, start warning device.
4. a kind of highway congestion event early warning system of highway congestion event detecting method using described in claim 3, including,
Sensing unit, including at least two groups of inductive components, each inductive component include the first induction installation and the second sensing
Device, it is 1~50m that first induction installation and second induction installation, which set spacing, two adjacent groups inductive component spacing
For 200~3000m；
Signal processing module, it is connected with the sensing unit using wired or wireless communication mode, it is single to obtain the sensing
Time parameter caused by first transmission signal；
Determination module system, the determination module system include passing through wired or wireless communication respectively with the signal processing module
Determination module one, determination module two and the determination module three that mode connects, the determination module one, determination module two and judgement mould
Block three is handled the time parameter to obtain different decision value, the determination module one, determination module two and determination module
Three, respectively by the decision content compared with given threshold, determine whether to send pre-warning signal；And
Warning device, with the determination module one, determination module two and determination module three respectively by wired or wireless communication side
Formula connects, and the warning device receives the early warning letter that determination module one, determination module two or the determination module three are sent
Number and make alarm response.
5. highway congestion event early warning system according to claim 4, wherein, described a pair of speeds of service of determination module
And signal averaging time occupancyJudged；Average speed of the determination module two to i-th of cycleSignal is put down
The absolute value of equal time occupancy differenceAnd the absolute value of average speed differenceJudged；The determination module three
To the first section j and the absolute value △ V of the second section j-1 speed differencej,j-1, occupation rate difference absolute valueAnd
The absolute value △ N of difference in flowj.j-1Judged.
6. the highway congestion event early warning system according to claim 4 or 5, wherein, the induction installation is wireless sensing
Device, coil, laser or video.
7. highway congestion event early warning system according to claim 6, wherein, the induction installation senses for wireless geomagnetism
Device.
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| CN106408937A (en) * | 2016-08-29 | 2017-02-15 | 迈锐数据（北京）有限公司 | Distributed road condition detection system and and distributed road condition detection method |
| CN107025789B (en) * | 2017-05-27 | 2021-07-23 | 青岛海信网络科技股份有限公司 | Traffic incident detection method and device |
| CN111311928A (en) * | 2020-03-20 | 2020-06-19 | 西安电子科技大学 | Speed measuring system and speed measuring method of double geomagnetic sensors |
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