CN106297329A - A kind of signal timing dial adaptive optimization method of networking signals machine - Google Patents
A kind of signal timing dial adaptive optimization method of networking signals machine Download PDFInfo
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Abstract
The invention discloses the signal timing dial adaptive optimization method of a kind of networking signals machine, the method includes that traffic flow acquisition module gathers crossing each lane traffic flow information；Pass to timing designing processing module and carry out timing designing process, find each phase place key track group, optimize timing scheme according to track saturation；And the timing scheme feeding semaphore signal control module after optimizing, and then control signal display module, complete the optimization to intersection signal timing.This programme can obtain intersection traffic flow information in time, signal lights also can be made can to adjust according to current intersection state self-adaption, thus reach reasonable distribution traffic resource, reduces the purpose of traffic congestion.
Description
Technical field
The invention belongs to traffic signalization field, be specifically related to the signal timing dial adaptive optimization of a kind of networking signals machine
Method.
Background technology
Road is mankind's flow of personnel, the basis transporting goods and materials, and its existence constitutes modern society and constantly advances
Foundation stone.Along with the lasting propelling of Urbanization in China, traffic flow, also growing, therefore creates a series of friendship
Corresponding topic, as traffic congestion happens occasionally, people's travel time extends, and the phenomenon such as traffic pollution is the most serious.
Research finds, setting up City ITS (Intelligent Traffic System, ITS) can be effective
Utilize existing means of transportation, reduce traffic congestion and environmental pollution, guarantee traffic safety, raising road utilization rate.Intelligence is handed over
Way system belongs to comprehensive system, wherein sets up the traffic control system of advanced person, improves the signal time distributing conception of crossing so that it is
It is more suitable for crossing practical situation to can be described as alleviating one of maximally efficient means of traffic jam issue.
As the important component part of urban highway traffic, crossing is the important node of city road network.Urban intersection
The signal management control level at place decides the height of its traffic efficiency.At present, the control mode signal that China is the most frequently used belongs to
Multi-period fixing timing controls, and semaphore can only run according to pre-set timing scheme, it is impossible to according to crossing wagon flow
The change of amount is made and being adjusted in time；And the method can being optimized timing scheme is divided into two kinds, one is according to going through
History data or predetermined one or more sets timing schemes good of experience, obtain data by wagon detector, input computation model
Calculate, and select in scheme set in advance according to result of calculation.The Typical Representative of this method is Sydney self adaptation
Traffic control system SCATS system, shortcoming is that intersection situation is complicated, and timing scheme Limited Number, limit it excellent
The effect changed.Another is then the method setting up traffic flow mathematical model, introduces intelligent algorithm and solves, and obtains optimizing timing
Scheme.Shortcoming is that mathematical model is complex, computationally intensive, it is difficult to meet requirement of real-time, the highest to hardware requirement, this
Method is generally used for school or scientific research institution etc., less in actual application.
Such as application number 201510419441.X, the patent of entitled " adaptive congestion control algorithm system based on semaphore ",
The method uses saturation as the basis of timing designing, when obtaining the vehicle flowrate data in each track, first calculates it saturated
Degree, calculates the green time of each phase place, compared with this patent, only considered the green time of this phase place, do not have further according to formula
Considering this phase place and other phase time restricting relation to each other, effect of optimization is subject to certain restrictions.
Such as application number 201610067404.1, entitled " a kind of crossing dynamic adjusting method and device, system " special
Profit.The method is after obtaining according to current demand signal timing scheme and traffic flow data optimization optimizing timing scheme, in addition it is also necessary to carry out
Traffic simulation, and both results are compared, final output optimizes timing scheme, considerably increases the complexity of calculating, firmly
Part cost also to promote accordingly.
Such as application number 201510150649.6, entitled " a kind of traffic lights based on the fuzzy control improved optimize timing
Method " patent, the method use particle cluster algorithm, solve in conjunction with fuzzy controller, the timing scheme after being optimized.This
Method solves computationally intensive, and complexity is high, is generally placed upon background server and runs, and real-time is affected.
Summary of the invention
Fix to solve current crossing timing scheme, it is impossible to carry out self-adaptative adjustment according to intersection traffic situation
Shortcoming；Meanwhile, for improving scheme Limited Number in existing self adaptation timing method, effect of optimization is restricted, or mathematical model
Handing over complexity, real-time is bad, the shortcoming higher to hardware requirement, the invention provides the signal timing dial of a kind of networking signals machine certainly
Adapting to optimization method, this programme relates to following module: traffic flow acquisition module, timing designing processes and signal controls
Module, and traffic signal display module, the signal timing dial adaptive optimal system of a kind of networking signals machine, particularly as follows:
Traffic flow acquisition module: traffic flow acquisition module can use multiple wagon detector, as radar vehicle checker,
Video vehicle checker, earth magnetism vehicle checker ... gather each branch lane traffic flow information in the range of crossing, and by RS485 or
Ethernet passes to timing designing and processes and signal control module；
Timing designing processes and signal control module: timing designing processes and signal control module is positioned at semaphore.Connect
Receive the traffic flow data collected and carry out timing designing process, and according to optimizing timing scheme by corresponding information (signal lights shape
State, countdown etc.) give signal display module by lamp panel signal, complete the control to traffic flow.Additionally, signal control module
Also the timing scheme of optimization and signal lights state etc. can be sent to command centre through fiber optical transceiver, join for traffic administration person
Examine.
Traffic signal display module: include traffic light and countdown.Process according to timing designing and signal controls mould
The signal condition that block sends shows accordingly, the light color of display current demand signal lamp lamp group and the count down information of countdown board
Deng.
Above-mentioned several module and command centre together form whole system, and traffic flow acquisition module gathers crossing car
Flow information；Timing designing processes and signal control module processes information of vehicle flowrate, optimizes timing scheme, and is passed by traffic behavior
Pass command centre for traffic administration person's reference；The light color of traffic signal display module displaing lamp and the time of countdown；
This intersection state can be checked by command centre, and decides whether to get involved and adjust timing scheme.
Wherein, the method for signal timing dial adaptive optimization is specifically comprised the following steps that
Step 1), specified the vehicle flowrate in crossing all directions branch cycle time track to believe by wagon detector collection
Breath, mainly includes number of vehicles and occupation rate.
Step 2), according to the difference of crossing situation, each for crossing entrance driveway is divided into some by left-hand rotation craspedodrome right-hand rotation
Individual track group, and calculate the traffic capacity of each track group respectively.The traffic capacity of crossing equal to each track group traffic capacity it
With, formula is as follows:
Qi=Si·λi=Si·gi/C
Si=S0NfWfHVfRTfLT
In formula: Qi: the traffic capacity (pcu/h) of the i-th phase place track group；
Si: the saturation volume (pcu/h) of the i-th phase place track group；
λi: the split of the i-th phase place track group；
gi: the effective green time (s) of the i-th phase place；
C: crossing cycle time (s)；
S0: entrance driveway track group saturation volume (pcu/h) under ideal conditions；
N: the number of lanes that entrance driveway track group is comprised；
fW: the width calibration coefficient in track, crossing；
fHV: heavy goods vehicles correction coefficient；
fRT: right-hand rotation wagon flow correction coefficient；
fLT: left turn traffic correction coefficient.
Step 3), calculate the track flow-rate ratio of each track group, find out the crucial car of each phase place according to crossing phase condition
Road group, and calculate cycle flow-rate ratio, formula is as follows:
yi=qi/Si
In formula: yi: the i-th phase place track group flow-rate ratio；
qi: by the actual vehicle flowrate (pcu) in this track；
Y: crossing cycle flow-rate ratio；
Step 4), determine this crossing constraints: green time retrain, cycle constraint and saturation constraint.These are about
Bundle is to ensure that motor vehicles, bicycle and pedestrian can cross safely street, and wherein, green time constraint is typically no less than 12s,
Big no more than 100s；Signal period duration is the shortest takes 30～40s, maximum no more than 180s；Saturation constraint is according to not
Same intensity value size chooses different prioritization schemes.
Step 5), carry out the calculating of effective green time, specific as follows:
5-1) when intersection saturation degree is less than 0.3, it is believed that this crossing vehicle flowrate is less, now wagon flow is unstable, adopts
By former fixing timing scheme；
5-2) when intersection saturation degree is between 0.3 to 1.0, utilize formula below to calculate, and will not meet
The g of constraintsiMin/max when taking eligible, obtains green time gi。
gi=C yi/Y
When saturation is little, the cycle after optimization can be made according to historical traffic flow data by control predetermined period C
Length is a little bit smaller；And when saturation is bigger, optimization can also be made according to historical traffic flow data by increasing predetermined period C
After Cycle Length the biggest；
5-3) when intersection saturation degree is more than 1.0, it is believed that this crossing tends to blocking up, and now should not frequently change the cycle
Length, therefore use former fixing timing scheme；
5-4) in order to make the green time of each phase place of signal lights adjacent periods seamlessly transit, there is not violent change, will
The green time g that this calculation optimization obtainsiTake weighted mean with the time of above 5-10 time use, obtain final green light
Time gi。
Beneficial effect
Traffic flow acquisition, optimization timing calculating and Signalized control and display are organically combined by the present invention, four
Each performs its own functions for part, indispensable, completes the optimization to Intersections timing scheme.The present invention is not presupposed solution,
The number not having timing scheme limits, and does not limit effect of optimization；Relative size according to each phase place key track group flow-rate ratio
Determining the green time in next cycle, computational methods are simple and effective.The present invention to the optimization of timing scheme with the past one
Or the vehicle flowrate data in several cycle are core, with historical traffic flow data for auxiliary, complete intersection traffic flow
Self-adaptative adjustment, reach improve traffic resource utilization rate, improve people go on a journey experience purpose.
Accompanying drawing explanation
Fig. 1 is the graph of a relation between each module of the present invention；
Fig. 2 is detail flowchart of the present invention.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
The present embodiment uses Single Intersection, the scene of four multiphase traffic time allocation schemes, and the timing to Intersections carries out excellent
Change.Four phase places are respectively north and south and keep straight on (30s), and turning left (12s) in north and south, thing is kept straight on (20s), and thing turns left (15s), does not examines
Consider right-turning vehicles.Crossing inlet road vehicle flowrate is as shown in table 1:
Table 1
Step 1) traffic flow in each track of different directions, wagon detector Real-time Collection crossing: include number of track-lines and account for
There is rate；
Step 2) according to the difference of crossing situation, crossing is divided into eight track groups, each direction can be drawn
It is divided into left turn lane group and Through Lane group, the number of vehicles in the group of same track is merged, and calculates each track group respectively
The traffic capacity.The traffic capacity of crossing is equal to each track group traffic capacity sum, and formula is as follows:
Qi=Si·λi=Si·gi/C
Si=S0NfWfHVfRTfLT
In formula: Qi: the traffic capacity (pcu/h) of the i-th phase place track group；
Si: the saturation volume (pcu/h) of the i-th phase place track group；
λi: the split of the i-th phase place track group；
gi: the effective green time (s) of the i-th phase place；
C: crossing cycle time (s)；
S0: entrance driveway track group saturation volume (pcu/h) under ideal conditions；
N: the number of lanes that entrance driveway track group is comprised；
fW: the width calibration coefficient in track, crossing；
fHV: heavy goods vehicles correction coefficient；
fRT: right-hand rotation wagon flow correction coefficient；
fLT: left turn traffic correction coefficient.
The parameter of above-mentioned formula determines according to crossing practical situation, can obtain eastern left-hand rotation S1=1659；East craspedodrome S2=
3384；Western left-hand rotation S3=1625；Western craspedodrome S4=1728；South left-hand rotation S5=1711；South craspedodrome S6=2946；North left-hand rotation S7=
1676；North craspedodrome S8=3146.
Step 3) calculate the track flow-rate ratio of each track group, the crucial track of each phase place is found out according to crossing phase condition
Group, and calculate cycle flow-rate ratio, formula is as follows:
yi=qi/Si
In formula: yi: the i-th phase place track group flow-rate ratio；
qi: by the actual vehicle flowrate (pcu) in this track；
Y: crossing cycle flow-rate ratio；
Crucial track group can be obtained and flow-rate ratio is respectively as follows: north craspedodrome S8=0.2378；South left-hand rotation S5=0.1783；Keep straight in east
S2=0.1735；East left-hand rotation S1=0.1754；Cycle flow-rate ratio Y=0.765；
Step 4) determine this crossing constraints: green time retrains, cycle constraint and saturation constraint.These constraints
Being to ensure that motor vehicles, bicycle and pedestrian can cross safely street, wherein, green time constraint is typically no less than 12s, maximum
It is not more than 100s；Signal period duration is the shortest takes 30～40s, maximum no more than 180s；Saturation constraint is according to difference
Intensity value size choose different prioritization schemes.The minimum 12s of green time herein, maximum no more than 40s, it is Central-South
North craspedodrome green time is not less than 24s not less than 30s, thing craspedodrome green time.The signal period the shortest 40s that takes, maximum little
In 110s.
Step 5) carry out the calculating of effective green time, specific as follows:
5-1) because crossing flow-rate ratio is 0.765, between 0.3 to 1.0, formula below is utilized to calculate, and
The g of constraints will not metiMin/max when taking eligible, obtains green time gi。
gi=C yi/Y
Calculate g0=28s；g1=21s；g2=20s；g3=20s；C=89s；
G is obtained after adjustment0=30s；g1=21s；g2=24s；g3=20s；C=95s；
5-2) in order to make the green time of each phase place of signal lights adjacent periods seamlessly transit, there is not violent change, will
The green time g that this calculation optimization obtainsiWeighted mean is taken, this calculated knot with the time of above 10 uses
Really weight is 0.4, and remaining green time weight is 0.06, thus obtains final green time gi。
g0=30s；g1=16s；g2=24s；g3=18s；C=95s.
Claims (1)
1. the signal timing dial adaptive optimization method of a networking signals machine, it is characterised in that comprise the steps:
Step 1), specified the information of vehicle flowrate in crossing all directions branch cycle time track by wagon detector collection, main
Number of vehicles to be included and occupation rate；
Step 2), according to the difference of crossing situation, each for crossing entrance driveway is divided into several cars by left-hand rotation craspedodrome right-hand rotation
Road group, and calculate the traffic capacity of each track group respectively；The traffic capacity of crossing is equal to each track group traffic capacity sum, public
Formula is as follows:
Qi=Si·λi=Si·gi/C
Si=S0NfWfHVfRTfLT
In formula: Qi: the traffic capacity (pcu/h) of the i-th phase place track group；
Si: the saturation volume (pcu/h) of the i-th phase place track group；
λi: the split of the i-th phase place track group；
gi: the effective green time (s) of the i-th phase place；
C: crossing cycle time (s)；
S0: entrance driveway track group saturation volume (pcu/h) under ideal conditions；
N: the number of lanes that entrance driveway track group is comprised；
fW: the width calibration coefficient in track, crossing；
fHV: heavy goods vehicles correction coefficient；
fRT: right-hand rotation wagon flow correction coefficient；
fLT: left turn traffic correction coefficient；
Step 3), calculate the track flow-rate ratio of each track group, find out the crucial track group of each phase place according to crossing phase condition,
And calculate cycle flow-rate ratio, formula is as follows:
yi=qi/Si
In formula: yi: the i-th phase place track group flow-rate ratio；
qi: by the actual vehicle flowrate (pcu) in this track；
Y: crossing cycle flow-rate ratio；
Step 4), determine this crossing constraints: green time retrain, cycle constraint and saturation constraint；These constraints are
In order to ensure that motor vehicles, bicycle and pedestrian can cross safely street, wherein, green time constraint is typically no less than 12s, the most very much not
More than 100s；Signal period duration is the shortest takes 30～40s, maximum no more than 180s；Saturation retrains according to different
Intensity value size chooses different prioritization schemes；
Step 5), carry out the calculating of effective green time, specific as follows:
5-1) when intersection saturation degree is less than 0.3, it is believed that this crossing vehicle flowrate is less, now wagon flow is unstable, uses former
Fixing timing scheme；
5-2) when intersection saturation degree is between 0.3 to 1.0, utilize formula below to calculate, and constraint will not met
The g of conditioniMin/max when taking eligible, obtains green time gi；
gi=C yi/Y
When saturation is little, the Cycle Length after optimization can be made according to historical traffic flow data by control predetermined period C
A little bit smaller；And when saturation is bigger, can also be according to historical traffic flow data, after making optimization by increase predetermined period C
Cycle Length is a little big；
5-3) when intersection saturation degree is more than 1.0, it is believed that this crossing tends to blocking up, and now should not frequently change the cycle long
Degree, therefore use former fixing timing scheme；
5-4) in order to make the green time of each phase place of signal lights adjacent periods seamlessly transit, there is not violent change, by this
The green time g that calculation optimization obtainsiTake weighted mean with the time of above 5-10 time use, obtain final green time
gi。
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| CN107730928A (en) * | 2017-11-29 | 2018-02-23 | 天津易华录信息技术有限公司 | For ensureing that the signal of crossing primary phase time optimizes system |
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| CN111429714A (en) * | 2018-12-24 | 2020-07-17 | 北京嘀嘀无限科技发展有限公司 | Traffic signal optimization method and device, and computer-readable storage medium |
| CN111429714B (en) * | 2018-12-24 | 2022-04-12 | 北京嘀嘀无限科技发展有限公司 | Traffic signal optimization method and device, and computer-readable storage medium |
| CN109903570A (en) * | 2019-04-22 | 2019-06-18 | 吉林大学 | Intersection signal timing scheme smooth transient method under multi-period timing controlled |
| CN111081039A (en) * | 2019-12-31 | 2020-04-28 | 同济大学 | Real-time dynamic intersection signal control design method and system |
| CN112365713A (en) * | 2020-11-09 | 2021-02-12 | 武汉工程大学 | Main branch intersection signal timing optimization method |
| CN112365714A (en) * | 2020-11-11 | 2021-02-12 | 武汉工程大学 | Traffic signal control method for intersection of intelligent rail passing main branch road |
| CN112365714B (en) * | 2020-11-11 | 2022-05-10 | 武汉工程大学 | Traffic signal control method for intersection of intelligent rail passing main branch road |
| CN112863205A (en) * | 2021-03-01 | 2021-05-28 | 武汉纵横智慧城市股份有限公司 | Signal lamp timing method, device, equipment and storage medium based on big data |
| CN114360264A (en) * | 2022-01-18 | 2022-04-15 | 重庆大学 | Intelligent city traffic management method based on traffic flow regulation |
| CN114822023A (en) * | 2022-04-15 | 2022-07-29 | 安徽科力信息产业有限责任公司 | Method for rapidly generating intersection signal timing scheme tending to target saturation |
| CN114822023B (en) * | 2022-04-15 | 2024-02-27 | 安徽科力信息产业有限责任公司 | Intersection signal timing scheme rapid generation method tending to target saturation |
| CN115206105A (en) * | 2022-07-27 | 2022-10-18 | 北京英泰智科技股份有限公司 | Regional traffic signal cooperative control system and method |
| WO2024140312A1 (en) * | 2022-12-26 | 2024-07-04 | 北京东土正创科技有限公司 | Intersection stage green light time optimization method, apparatus, device and storage medium |
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