CN107730921A - Urban area traffic oversaturation traffic strategy control method - Google Patents
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Abstract
The invention provides a control method of an urban traffic oversaturation traffic strategy, which directly or indirectly relieves the oversaturation condition of a traffic intersection through setting different detectors. The detector comprises a relative detector and an absolute detector, the queuing length of the vehicles is calculated through the detection of the number of the vehicles, the green time is controlled according to the queuing length of the vehicles, the effective green time required by the vehicles to pass through the next intersection is calculated through the data detected by the detector of the upstream intersection through the associated relation at the downstream intersection, and the green time at the downstream intersection is optimized. By way of example in one direction, other directions are measured and calculated according to detectors in all directions, the green light time of the whole intersection is determined and optimized by the same method, and finally the oversaturation state of the whole intersection is relieved, so that the intersection plays a greater role, the road utilization rate is increased, and the effect of relieving traffic pressure is achieved.
Description
Technical field
The present invention relates to intelligent traffic signal control technology field.
Background technology
At present, as China's economic grows continuously and fast, particularly speed of the city automobile owning amount just to be exceedingly fast in recent years
Degree increases, and the sharp increase of car ownership makes urban road more congestion, and the intersection of particularly big city center is big
It is in saturation or over-saturation state more.Congested in traffic aggravation, not only result in huge economic loss, energy waste, pollution
Environment, if development is serious, it may result in the paralysis of city function.Traffic congestion can also aggravate increasing for traffic accident, and
The generation of traffic accident can aggravate traffic congestion again, form vicious circle, and traffic congestion has become the bottle for restricting economic development
Neck, the research to city supersaturation traffic are very necessary.
Current operating traffic control system is coordinating control aspect in addition to single-point controls, main including following several
Class：It is time-based to coordinate control；Control system of online；Traffic regulation and control system；Traffic response control system；Traffic is adaptive
Answer control system.It is typical represent system such as SCOOT, SCATS, OPAC, RHODES, SPOT/UTOPIA, VS-PLUS, MOVA,
SMART NETS/TUC etc..China city is newly-increased every year and the urban traffic signal of renewal control crossing is all in ten thousand semaphores
Scale, meanwhile, the business circles in China have also gradually formed some representational traffic signal control systems, such as Nanjing Lai Sicheng
City's traffic control system, Hisense's Hicon traffic signal control systems, relaxing for Shanghai Communications University reach urban traffic adaptive control system
Deng playing more and more important effect in the urban traffic management in China.And all there is supersaturation and hand in above-mentioned technology
The deficiency of logical policy control.
Present invention employs opposing detectors and absolute detector, and by controlling rule and control method to control accordingly
System, in the case of double control, to improve the utilization rate of road, and then to alleviate traffic congestion.
The content of the invention
In order to solve the above technical problems, disclosing a kind of supersaturated Transportation Strategies control method, this method is by installing two
Opposing detectors and an absolute detector, by controlling regular and corresponding control method to prevent crossing overflow accordingly
Produce.Wherein crossing one is used by corresponding control method and associates control with upstream crossing to reach to supersaturated road
The optimization of mouth and control effect.Crossing two passes through two opposing detectors and an absolute detector, two opposing detectors bags
Straight trip detector a and left turn detector b is included, determines the trigger condition of detector, each detector needs green with respective minimum
Saturation volume rate reaches vehicle queue length to calculate.Absolute detector c is placed on outlet most nearby.Specifically use following technical side
Case：
This method comprises the following steps：
(1) two adjacent crossroads are chosen, are designated as crossing one and crossing two, the west exit at crossing two installs detection
Device, detector include two opposing detectors and an absolute detector；
(2) position of opposing detectors is determined, opposing detectors include straight trip detector a and left turn detector b, by using
The product of minimum green time and saturation volume rate seeks the maximum vehicle number C that can allow to pass throughn, accordingly and with reference to Vehicle length l
Admissible maximum vehicle queue length L is calculated with following distance cmaxn, required maximum vehicle queue length is detector
Length L' away from crossingn。
Then the determination formula of opposing detectors position is
Cn=Sn*gmin n
Lmax n=Cn*(l+c)
L′n=Lmax n
Wherein CnFor the maximum vehicle number passed through, S can be allowednFor saturation volume rate, gmin nFor minimum green time, Lmax n
For the admissible maximum vehicle queue length in crossing two, l-be Vehicle length, c-it is following distance；L′nFor the reality of detector
Length of the installation site away from crossing two.
1) straight trip detector a positions are determined, now n=1.
Wherein C1The maximum vehicle number that can allow to pass through for two eastern import of crossing straight trip, S1It is full for two eastern import of crossing straight trip
And flow rate, gmin 1For the minimum green time of two eastern import of crossing straight trip, Lmax 1For the eastern import straight trip of the admissible maximum in crossing two
Vehicle queue length, l-be Vehicle length, c-it is following distance；Finally give the installation site L ' for the detector a that then keeps straight on1To be straight
Distance of the row detector away from crossing two.
2) left turn detector b positions are determined, now n=2.
Wherein C2Respectively the southing mouth of crossing two turns left to allow the maximum vehicle number passed through, S2It is left for the southing mouth of crossing two
Turn saturation volume rate, gmin 2For the minimum green time of the southing mouth of crossing two left-hand rotation, Lmax 2For the admissible maximum southing mouth in crossing two
Left turning vehicle queue length, l-be Vehicle length, c-it is following distance；Finally give left turn detector b installation site L '2For
Distance of the left turn detector away from crossing two.
(3) position of absolute detector is determined, absolute detector c riding position is the exit of crossing two；
(4) control strategy and the optimization of local controller are determined, when detector is occupied, then shows the reality detected
Queue length is more than the maximum queue length allowed；Optimization is realized by calculating effective green time, when calculating Effective Green Time
Between formula be：
Ln=cn*(l+c)
ge n=Ln/uw
Wherein ge n- the effective green time needed for detector queue length, Ln- the reality detected for detector
Queue length, cn- actual vehicle the number detected for detector, uw- it is the eastern import evanescent wave velocity of wave in crossing one, uf- it is smooth
Scanning frequency degree, u-be one eastern import of crossing the speed of service；L-be Vehicle length, c-it is following distance；
1) when straight trip detector a, when tri- detectors of left turn detector b, absolute detector c are not occupied
Control strategy is：Crossing two eastern imports straight trip, southing mouth turn left, and the vehicle that northing mouth is turned right puts green light, continues
It is current；Continue to maintain the original state current in crossing one；Without optimization.
2) when only straight trip detector a is occupied, now n=1.
Control strategy is：Red light is put in crossing two eastern imports straight trip, and no through traffic, and southing mouth turns left, the car that northing mouth is turned right
Green light is put, continue to pass through.Optimization Steps are：The actual vehicle number c that crossing one detects according to straight trip detector a1To count
Calculate actual queue length L1, then pass through actual queue length L1With evanescent wave velocity of wave uwIt is effective green needed for crossing one to calculate
Lamp time ge1To optimize.
3) when keep straight on detector and left turn detector are occupied, now n=2.
Control strategy is：The eastern import straight trip in crossing two and southing mouth turn left to put red light, and no through traffic, the car that northing mouth is turned right
Green light is put, continuing current Optimization Steps is：The actual vehicle number c that crossing one detects according to left turn detector b2To count
Calculate actual queue length L2, then pass through actual queue length L2With evanescent wave velocity of wave uwIt is effective green needed for crossing one to calculate
Lamp time ge2To optimize.
4) when three detectors are occupied, now n=3.
Control strategy is：Crossing two eastern imports straight trip, southing mouth turns left and northing mouth is turned right and puts red light, and no through traffic.
Optimization Steps are：The actual vehicle number c that crossing one detects according to absolute detector c3To calculate actual queue length L3, then
Pass through actual queue length L3With evanescent wave velocity of wave uwTo calculate the effective green time g needed for crossing onee3To optimize.
The present invention has following beneficial technique effect：
1st, invention is applied to the adjacent right-angled intersection of any two, and crossing is not limited specifically, suitable for appointing
The adjacent crossroad of what adjacent two, can be applied to the crossing of different cities.
2nd, by the setting of opposing detectors and absolute detector, the testing number of opposing detectors and absolute detector is passed through
According to, to carry out the control to signal lamp, and then to control the current of vehicle, the operation of vehicle most can be efficiently controlled, can be with
The generation of overflow is prevented, the control problem for effectively solving supersaturated traffic.
3rd, crossing one is with upstream by associating control, can optimization of road joints control effect.
Brief description of the drawings
Fig. 1 is technical scheme figure.
Fig. 2 is crossing and detector distribution map.
Fig. 3 is opposing detectors particular location schematic diagram.
Fig. 4 is absolute detector particular location schematic diagram.
Fig. 5 is control strategy flow chart.
Embodiment
Technical scheme is described in detail used by being directed to Summary below in conjunction with the accompanying drawings, and key step is such as
Under：
Step 1：Two adjacent crossroads are chosen first, crossing one and crossing two are named as, with exporting to the west for crossing two
Studied exemplified by mouthful, and the west exit at crossing two installs detector.Wherein detector includes two opposing detectors and one exhausted
To detector.
Step 2：Determine the position of opposing detectors.By setting detector, trigger condition is determined, opposing detectors can
Including the detector a and left turn detector b that keeps straight on.It can allow to pass through to ask by using the product of minimum green time and saturation volume rate
Maximum vehicle number Cn, accordingly and Vehicle length l and following distance c is combined to calculate admissible maximum vehicle queue length Lmaxn,
Required maximum vehicle queue length is length L' of the detector away from crossingn。
The determination formula of opposing detectors position is
Cn=Sn*gmin n
Lmax n=Cn*(l+c)
L′n=Lmax n
Wherein Cn--- the maximum vehicle number passed through can be allowed,
Sn--- saturation volume rate,
gmin n--- minimum green time,
Lmax n--- the admissible maximum vehicle queue length in crossing two,
L --- Vehicle length,
C --- following distance,
L′n--- length of the actual installation position far from crossing two of detector.
1) straight trip detector a positions are determined, now n=1.
Wherein C1The maximum vehicle number that can allow to pass through for two eastern import of crossing straight trip, S1It is full for two eastern import of crossing straight trip
And flow rate, gmin 1For the minimum green time of two eastern import of crossing straight trip, Lmax 1For the eastern import straight trip of the admissible maximum in crossing two
Vehicle queue length, l-be Vehicle length, c-it is following distance；Finally give the installation site L ' for the detector a that then keeps straight on1To be straight
Distance of the row detector away from crossing two.
2) left turn detector b positions are determined, now n=2.
Wherein C2Respectively the southing mouth of crossing two turns left to allow the maximum vehicle number passed through, S2It is left for the southing mouth of crossing two
Turn saturation volume rate, gmin 2For the minimum green time of the southing mouth of crossing two left-hand rotation, Lmax 2For the admissible maximum southing mouth in crossing two
Left turning vehicle queue length, l-be Vehicle length, c-it is following distance；Finally give left turn detector b installation site L '2For
Distance of the left turn detector away from crossing two.
Step 3：Determine the position of absolute detector, absolute detector c riding position be placed on outlet most nearby.
Why absolute detector c is placed on going out recently for outlet, is because such absolute detector c can be detected simultaneously by eastern import
Straight trip, southing mouth turn left, and all vehicles that northing mouth is turned right, can integrate the supersaturation ensured by the vehicle of crossing two.
Be advantageous to total vehicle data being sent to semaphore, be easy to the totality to the vehicle of remittance west exit to signal lamp
Control, prevent from causing the overflow phenomena of vehicle because the vehicle for entering crossing is excessive.Also opposing detectors are served simultaneously
The effect being further ensured that, make opposing detectors safer.
Step 4：Determine control strategy and the optimization of local controller.
Assuming that if 1. detectors are occupied as 1, detector is not occupied or not i.e. a=for 0. such as straight trip detector
1, left turn detector is not occupied i.e. b=0, and absolute detector is occupied i.e. c=1.
Assuming that 2. when detector is occupied, then show the actual queue length L detectednMaximum more than permission is lined up
Length Lmax n.For example, straight trip detector is occupied, then show the actual queuing for the vehicle that the straight trip detector a of crossing two is detected
Length reaches the maximum queue length for allowing eastern import through vehicles to enter.
Assuming that 3. actual queue length LnL is calculated according to formulan=C 'n* (l+c) is calculated.
Control strategy and the optimization of local controller are determined, when detector is occupied, then shows the actual row detected
Team leader's degree is more than the maximum queue length allowed；Optimization is realized by calculating effective green time, calculates effective green time
Formula be：
Ln=cn*(l+c)
ge n=Ln/uw
Wherein ge n- the effective green time needed for detector queue length, Ln- the reality detected for detector
Queue length, cn- actual vehicle the number detected for detector, uw- it is the eastern import evanescent wave velocity of wave in crossing one, uf- it is smooth
Scanning frequency degree, u-be one eastern import of crossing the speed of service；L-be Vehicle length, c-it is following distance.
(1) as straight trip detector a, when tri- detectors of left turn detector b, absolute detector c are not occupied, i.e. a=
When 0, b=0, c=0, now, two eastern import of crossing straight trip, southing mouth turns left, and northing mouth is turned right and may continue to clearance vehicle.
Work as a=0, when b=0, c=0, crossing two allows eastern import to keep straight on, and southing mouth turns left, and northing mouth right-turning vehicles enter
Enter, and eastern import is kept straight on, southing mouth turns left, the maximum that the queue length that northing mouth is turned right not up to allows.
Control strategy：
Crossing two：Eastern import straight trip, southing mouth turn left, and the vehicle that northing mouth is turned right can put green light, continue to pass through.
Crossing one：Continue to maintain the original state and pass through, without special optimization.
Optimization：Now crossing one does not have to special optimization, will not congestion, continue to keep current.
(2) when the i.e. a=1 when only straight trip detector a is occupied, b=0, c=0, now, two eastern import of crossing straight trip
Red light is set, and no through traffic；Southing mouth turns left, and northing mouth is turned right and may continue to put green light, continues clearance vehicle.
Work as a=1, when b=0, c=0, the actual queue length that crossing two allows eastern import through vehicles to enter reaches permission
The maximum of entrance, then allow eastern import straight trip to become red light, forbid the vehicle of crossing two eastern imports straight trip to enter.Now southing mouth
Turn left and the queue length of the vehicle of northing mouth right-hand rotation is also not up to the maximum allowed.Southing mouth can be allowed to turn left, northing
The vehicle that mouth is turned right enters.
Control strategy：
Crossing two：Red light is put in eastern import straight trip, and no through traffic, and southing mouth turns left, and the vehicle that northing mouth is turned right can be put green
Lamp, continue to pass through.
Crossing one：The actual queue length L that can be detected according to straight trip detector1During calculating the Effective Green Time at crossing one
Between optimize, specific Optimization Steps are shown in optimization 1.
Optimization 1：The actual queue length L detected according to straight trip detector a1To determine having needed for one eastern import of crossing
Imitate green time；
L1=c1*(l+c)
ge 1=L1/uw
Wherein ge1--- the effective green time needed for the queue length of straight trip detector,
L1--- the actual queue length detected for straight trip detector a,
c1--- the actual vehicle number detected for straight trip detector a,
uw--- it is the eastern import evanescent wave velocity of wave in crossing one,
uf--- it is the speed that passes unimpeded,
U --- it is the speed of service of one eastern import of crossing,
L --- it is Vehicle length,
C --- it is following distance；
The actual queue length L detected according to straight trip detector a1With the eastern import evanescent wave velocity of wave u in crossing onew, to calculate
Effective green time g required for the one eastern import straight trip detector queue length of crossinge1.And then the queuing for carrying out optimization of road joints one is entered
And to alleviate the influence that the supersaturation of crossing one is brought, crossing one is become unobstructed.And then to optimize the control to crossing one,
The clearance pattern at final optimization pass crossing one.
(3) when the i.e. a=1 when straight trip detector and left turn detector are occupied, b=1, c=0, now, the east of crossing two
Import is kept straight on, and southing mouth turns left to be respectively provided with red light, and no through traffic；, northing mouth, which is turned right, can continue to put green light, continue clearance car
.
Work as a=1, when b=1, c=0, crossing two allows eastern import straight trip and southing mouth left turning vehicle enters actual queuing
Length reaches the maximum allowed access into, then allows eastern import straight trip and southing mouth to turn left to become red light, forbids the east of crossing two
The vehicle that import straight trip and southing mouth turn left enters.The now queue length for the vehicle that northing mouth is turned right also not up to allows most
Big value.Southing mouth can be allowed to turn left, the vehicle that northing mouth is turned right enters.
Control strategy：
Crossing two：Eastern import straight trip and southing mouth turn left to put red light, and no through traffic, and the vehicle that northing mouth is turned right can be put green
Lamp, continue to pass through.
Crossing one：The actual queue length L that crossing one can detect according to left turn detector2To calculate the effective of crossing one
Green time optimizes, and specific Optimization Steps are shown in optimization 2.
Optimization 2：The actual queue length L detected according to left turn detector b2To determine having needed for one eastern import of crossing
Imitate green time；
L2=c2*(l+c)
ge 2=L2/uw
Wherein ge2--- the effective green time needed for left turn detector b queue lengths,
L2--- the actual queue length detected for left turn detector b,
c2--- the actual vehicle number detected for left turn detector b,
uw--- it is the eastern import evanescent wave velocity of wave in crossing one,
uf--- it is the speed that passes unimpeded,
U --- it is the speed of service of one eastern import of crossing；
L --- it is Vehicle length,
C --- it is following distance；
The actual queue length L detected according to left turn detector b2With the eastern import evanescent wave velocity of wave in crossing one, to calculate
Effective green time g required for the one eastern import straight trip detector queue length of crossinge2.And then the queuing for carrying out optimization of road joints one is entered
And to alleviate the influence that the supersaturation of crossing one is brought, crossing one is become unobstructed.And then to optimize the control to crossing one,
The clearance pattern at final optimization pass crossing one.
(4) when the i.e. a=1 when three detectors are occupied, b=1, c=1, now, eastern import straight trip, a southing mouth left side
Turn, three directions of northing mouth right-hand rotation all become red light, and all no through traffic.
Work as a=1, when b=1, c=1, crossing two allows eastern import to keep straight on, southing mouth turns left and northing mouth is turned right three sides
The actual queue length entered to vehicle reaches the maximum allowed access into, then allows three directions to become red light, road closed to passage
The vehicle in two or three directions of mouth enters.
Control strategy：
Crossing two：Eastern import straight trip, southing mouth turns left and northing mouth is turned right and puts red light, and no through traffic.
Crossing one：The actual queue length L that crossing one can detect according to absolute detector3To calculate the effective of crossing one
Green time optimizes, and specific Optimization Steps are shown in optimization 3.
Optimization 3：The actual queue length L detected according to absolute detector c3To determine having needed for one eastern import of crossing
Imitate green time；
L3=c3*(l+c)
ge 3=L3/uw
Wherein ge3--- the effective green time needed for absolute detector c queue lengths,
L3--- the actual queue length detected for absolute detector c,
c3--- the actual vehicle number detected for absolute detector c,
uw--- it is the eastern import evanescent wave velocity of wave in crossing one,
uf--- it is the speed that passes unimpeded,
U --- it is the speed of service of one eastern import of crossing；
L --- it is Vehicle length,
C --- it is following distance；
The actual queue length L detected according to absolute detector c3With the eastern import evanescent wave velocity of wave u in crossing onewTo calculate
Effective green time g required for the one eastern import straight trip detector queue length of crossinge3.And then the queuing for carrying out optimization of road joints one is entered
And to alleviate the influence that the supersaturation of crossing one is brought, crossing one is become unobstructed.And then to optimize the control to crossing one,
The clearance pattern at final optimization pass crossing one.
Claims (1)
1. a kind of city area-traffic supersaturation Transportation Strategies control method, it is characterised in that comprise the following steps：
(1) two adjacent crossroads to be chosen, are designated as crossing one and crossing two, the west exit at crossing two installs detector,
Detector includes two opposing detectors and an absolute detector；
(2) position of opposing detectors is determined, opposing detectors include straight trip detector a and left turn detector b, by using minimum
The product of green time and saturation volume rate seeks the maximum vehicle number C that can allow to pass throughn, accordingly and with reference to Vehicle length l and car
Spacing c calculates admissible maximum vehicle queue length Lmaxn, required maximum vehicle queue length is detector away from road
The length L' of mouthn；
The determination formula of opposing detectors position is
Cn=Sn*gmin n
Lmax n=Cn*(l+c)
L′n=Lmax n
Wherein CnFor the maximum vehicle number passed through, S can be allowednFor saturation volume rate, gmin nFor minimum green time, Lmax nFor crossing
Two admissible maximum vehicle queue lengths, l-be Vehicle length, c-it is following distance；L′nFor the actual installation position of detector
Put the length away from crossing two；
1) straight trip detector a positions, n=1 are determined
Wherein C1The maximum vehicle number that can allow to pass through for two eastern import of crossing straight trip, S1For two eastern import of crossing straight trip saturated flow
Rate, gmin 1For the minimum green time of two eastern import of crossing straight trip, Lmax1For the eastern import through vehicles of the admissible maximum in crossing two
Queue length, l-be Vehicle length, c-it is following distance；Finally give the installation site L ' for the detector a that then keeps straight on1Examined for straight trip
Survey distance of the device away from crossing two；
2) left turn detector b positions, n=2 are determined
Wherein C2Respectively the southing mouth of crossing two turns left to allow the maximum vehicle number passed through, S2Turn left for the southing mouth of crossing two full
And flow rate, gmin 2For the minimum green time of the southing mouth of crossing two left-hand rotation, Lmax2Turn left for the admissible maximum southing mouth in crossing two
Vehicle queue length, l-be Vehicle length, c-it is following distance；Finally give left turn detector b installation site L '2To turn left
Distance of the detector away from crossing two.
(3) position of absolute detector is determined, absolute detector c riding position is the exit of crossing two；
(4) control strategy and the optimization of local controller are determined, when detector is occupied, then shows the actual queuing detected
Length is more than the maximum queue length allowed；Optimization is realized by calculating effective green time, calculates effective green time
Formula is：
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<mi>u</mi>
<mi>w</mi>
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<mo>=</mo>
<mo>-</mo>
<msub>
<mi>u</mi>
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<mo>(</mo>
<mn>1</mn>
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Ln=Cn*(l+c)
gen=Ln/uw
Wherein genThe effective green time needed for detector queue length, LnThe actual queue length detected for detector, cn
The actual vehicle number detected for detector, uwFor the eastern import evanescent wave velocity of wave in crossing one, ufFor the speed that passes unimpeded, u is the east of crossing one
The speed of service of import；L is Vehicle length, and c is following distance；
1) when straight trip detector a, when tri- detectors of left turn detector b, absolute detector c are not occupied
Control strategy is：Crossing two eastern imports straight trip, southing mouth turn left, and the vehicle that northing mouth is turned right puts green light, continues to pass through；
Continue to maintain the original state current in crossing one；
2) when only straight trip detector a is occupied, n=1
Control strategy is：Red light is put in crossing two eastern imports straight trip, and no through traffic, and southing mouth turns left, and the vehicle that northing mouth is turned right is equal
Green light is put, continues to pass through.Optimization Steps are：The actual vehicle number c that crossing one detects according to straight trip detector a1To calculate reality
The queue length L on border1, then pass through actual queue length L1With evanescent wave velocity of wave uwDuring calculating the Effective Green Time needed for crossing one
Between ge1To optimize；
3) when straight trip detector and left turn detector are occupied, n=2
Control strategy is：The eastern import straight trip in crossing two and southing mouth turn left to put red light, and no through traffic, and the vehicle that northing mouth is turned right is equal
Green light is put, continuing current Optimization Steps is：The actual vehicle number c that crossing one detects according to left turn detector b2To calculate reality
The queue length L on border2, then pass through actual queue length L2With evanescent wave velocity of wave uwDuring calculating the Effective Green Time needed for crossing one
Between ge2To optimize；
4) when three detectors are occupied, n=3
Control strategy is：Crossing two eastern imports straight trip, southing mouth turns left and northing mouth is turned right and puts red light, and no through traffic.Optimization
Step is：The actual vehicle number c that crossing one detects according to absolute detector c3To calculate actual queue length L3, then pass through
Actual queue length L3With evanescent wave velocity of wave uwTo calculate the effective green time g needed for crossing onee3To optimize.
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| CN201710811125.6A CN107730921B (en) | 2017-09-11 | 2017-09-11 | Urban area traffic oversaturation traffic strategy control method |
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| CN107730921B CN107730921B (en) | 2019-07-23 |
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| CN201710811125.6A Active CN107730921B (en) | 2017-09-11 | 2017-09-11 | Urban area traffic oversaturation traffic strategy control method |
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