CN103208191B - The optimization method of signal coordinated control under a kind of urban road intersection supersaturated condition - Google Patents
The optimization method of signal coordinated control under a kind of urban road intersection supersaturated condition Download PDFInfo
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Abstract
It is an object of the invention to disclose the optimization method of signal coordinated control under a kind of urban road intersection supersaturated condition, compared with prior art, based on the analysis to adjacent intersection upstream and downstream wagon flow state, use for reference wave theory, by the standing wave at contrast crossing, upstream and the size starting ripple of downstream road junction and direction, arterial highway, crossing, upstream vehicle queue situation, determine the state value of this signal controlled junctions, show that signal coordinated control reliability is interval (phase contrast) under different conditions, can be by the queuing overflow control at supersaturation crossing in certain scope, it is substantially reduced supersaturation crossing and the probability of deadlock occurs, the most also allow queuing overflow and become a kind of useful self regulation of intersection under supersaturated condition, realize the purpose of the present invention.
Description
Technical field
The present invention relates to the optimization method of a kind of signal coordinated control, particularly to a kind of intelligent transportation field for road
Intersection signal coordinates the optimization method of signal coordinated control under the urban road intersection supersaturated condition controlled.
Background technology
Urban road intersection signal coordination control system plays the most important effect, city in urban transportation
Traffic administration person attempts by urban traffic signal coordinated control system to alleviate urban transport problems.Fast due to motor vehicles
Speed increases, and a lot of cities all occur in that road traffic the most oversaturated saturated situation, under supersaturated condition, and current energy between crossing
Power is not mated, and can cause queuing clustering phenomena, and easily producing queues up overflows.
Urban road intersection signal coordination control system has that installation cost is low, it is simple to safeguard, efficiently, in real time and automatically
Change horizontal advantages of higher, obtain large-scale popularization application.At present, a lot of cities all establish intelligent transportation system ITS platform also
It is configured with urban road intersection signal coordination control system, is used for reducing vehicle and is delayed, improve going through ability.
The typically collection and analysis, traffic model by information of vehicles of coordinating control of traffic signals system (is used for calculating delay
Time and queue length etc.), timing strategy parameter optimize and revise, the execution of signal timing plan, scheme works feedback etc. five
Individual subsystem forms, and 5 subsystems cooperate, co-ordination, jointly complete traffic control task.
Traffic model is to utilize specific algorithm by the traffic state data at crossing through calculating the traffic shape at crossing
State parameter, then draws crossing signals Coordinated Control Scheme by analysis；Traffic model is the core of coordinating control of traffic signals
Sport technique segment.
Under supersaturated condition, the queuing overflow technique at crossing is the important content of coordinating control of traffic signals, but at present
The various systems applied there is a lot of deficiency about the queuing overflow control technology under supersaturated condition.
It is accordingly required in particular to the optimization method of signal coordinated control under a kind of urban road intersection supersaturated condition,
The problem solving above-mentioned existing existence.
Summary of the invention
It is an object of the invention to provide the optimization of signal coordinated control under a kind of urban road intersection supersaturated condition
Method, for the deficiencies in the prior art, based on to the analysis of crossing vehicle queue characteristic under supersaturated condition, runs ripple from wagon flow
Dynamic theory is set out, and makes crossing not deadlock under being in hypersaturated state.
Technical problem solved by the invention can realize by the following technical solutions:
As depicted in figs. 1 and 2, the optimization side of signal coordinated control under the urban road intersection supersaturated condition of the present invention
Method, it comprises the steps:
(1) on the basis of collecting road section traffic volume flow data, evanescent wave w is calculated respectively1With obstruction ripple w2；
(2) if w1≥w2, terminate；
(3) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall on two sections in the middle of crossings, then it represents that
There is not spillover in direction, arterial highway, the phase contrast coordinating to control by general signal processes；
(4) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall the upper of or i-th crossing internal at the i-th crossing
Trip, then it represents that direction, arterial highway has occurred and that spilling；
(5) formula is passed through: xB≤gi+ Δ Τ and yA≤ 0, calculate reliability interval Δ Τ:
Wherein, L is junction spacing, and q is queue length, xBFor traveling to the i-th crossing from timing start time to starting ripple
Time；giFor the time terminated to the i-th crossing red light from timing start time；yAFor evanescent wave and the intersection point of obstruction ripple.
In one embodiment of the invention, the induction coil at the i-th crossing every produced at the green light initial stage saturated
Time headway tijAnd speed vijData obtain:
The average saturation headway at the i-th crossing:
The saturation volume at the i-th crossing:
The vehicle average overall travel speed at the i-th crossing:
I-th crossing vehicle enters the vehicle density at crossing:
Wherein, n is the number of the valid data obtained, and can obtain the saturation volume Q at i+1 crossing the most according to thisi+1, i-th
The vehicle average overall travel speed v at+1 crossingi+1Vehicle density k with i+1 crossingi+1, thus obtain:
Evanescent wave:
Obstruction ripple:
In one embodiment of the invention, between the i-th crossing and i+1 crossing, the signal control cycle is equal, it is achieved phase
Coordination between adjacent two crossings controls.
In one embodiment of the invention, the i-th crossing and the i+1 crossing split in direction, arterial highway is the most current
Time is gi, it is ensured that capacity matching.
The optimization method of signal coordinated control under the urban road intersection supersaturated condition of the present invention, with prior art phase
Ratio, based on the analysis to adjacent intersection upstream and downstream wagon flow state, uses for reference wave theory, by the standing wave at contrast crossing, upstream and
The size starting ripple of downstream road junction and direction, arterial highway, crossing, upstream vehicle queue situation, determine the state of this signal controlled junctions
Value, show that signal coordinated control reliability is interval (phase contrast) under different conditions, it is possible to the queuing at supersaturation crossing overflowed
Control in certain scope, be substantially reduced supersaturation crossing and the probability of deadlock occurs, also allow queuing spilling become in mistake simultaneously
A kind of useful self regulation of intersection under saturation conditions, it is achieved the purpose of the present invention.
The feature of the present invention see graphic and the most preferably embodiment the detailed description of this case and obtains clearly
Solve.
Accompanying drawing explanation
Fig. 1 is the space-time trajectory diagram of the section vehicle of the present invention；
Fig. 2 be the present invention urban road intersection supersaturated condition under the flow process of optimization method of signal coordinated control show
It is intended to.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below knot
Conjunction is specifically illustrating, and the present invention is expanded on further.
The optimization method of signal coordinated control under the urban road intersection supersaturated condition of the present invention, believes at crossing single-point
Number control on the basis of, using the signal phase difference at upstream and downstream crossing as important parameter, carry out the queuing overflow control at crossing,
Symbol is defined as follows:
(1) distance of junction spacing L: two adjacent intersection, takes during calculating and stops from crossing, upstream stop line to downstream road junction
The distance of line.
(2) queue length q: the queue that downstream road junction green light start time queuing vehicle upstream extends from stop line is long
Degree.
(3) phase difference Τ: the minimum interval of upstream and downstream crossing green light start time.
(4) effectively transit time gi: effective transit time at crossing is green time and yellow time sum.
(5) flow Q is sailed at crossing, upstream intoi: roll the vehicle fleet of crossing, upstream stop line in the unit interval away from.
(6) speed v is sailed at crossing, upstream intoi: speed when wagon flow sails crossing, upstream into.
(7) crossing, upstream vehicle density ki: wagon flow rolls crossing, upstream stop line unit length road vehicle number away from.
(8) downstream road junction rolls flow Q away fromi+1: roll the vehicle fleet of downstream road junction stop line in the unit interval away from.
(9) downstream road junction rolls speed v away fromi+1: vehicle rolls spot spe J during downstream road junction stop line away from.
(10) vehicle density k is rolled in downstream away fromi+1: wagon flow rolls downstream road junction stop line unit length road vehicle number away from.
(11) jam density kj: it is unit length road vehicle number that wagon flow is queued up slack.
(12) evanescent wave w1: the speed that wagon flow is propagated from the static state becoming startup optimization of queuing up to fleet rear.
(13) ripple w is blocked2: wagon flow is become, from operation, the static state speed to fleet's rear propagation of queuing up.
As depicted in figs. 1 and 2, the optimization side of signal coordinated control under the urban road intersection supersaturated condition of the present invention
Method, it comprises the steps:
(1) on the basis of collecting road section traffic volume flow data, evanescent wave w is calculated respectively1With obstruction ripple w2；
(2) if w1≥w2, terminate；
(3) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall on two sections in the middle of crossings, then it represents that
There is not spillover in direction, arterial highway, the phase contrast coordinating to control by general signal processes；
(4) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall the upper of or i-th crossing internal at the i-th crossing
Trip, then it represents that direction, arterial highway has occurred and that spilling；
(5) formula is passed through: xB≤gi+ Δ Τ and yA≤ 0, calculate reliability interval Δ Τ:
Wherein, L is junction spacing, and q is queue length, xBFor traveling to the i-th crossing from timing start time to starting ripple
Time；giFor the time terminated to the i-th crossing red light from timing start time；yAFor evanescent wave and the intersection point of obstruction ripple.
In the present invention, the induction coil at the i-th crossing every the saturation headway t produced at the green light initial stageijAnd
Speed vijData obtain:
The average saturation headway at the i-th crossing:
The saturation volume at the i-th crossing:
The vehicle average overall travel speed at the i-th crossing:
I-th crossing vehicle enters the vehicle density at crossing:
Wherein, n is the number of the valid data obtained, and can obtain the saturation volume Q at i+1 crossing the most according to thisi+1, i-th
The vehicle average overall travel speed v at+1 crossingi+1Vehicle density k with i+1 crossingi+1, thus obtain:
Evanescent wave:
Obstruction ripple:
In the present invention, between the i-th crossing and i+1 crossing, the signal control cycle is equal, it is achieved between adjacent two crossings
Coordination control.
In the present invention, effective transit time of the i-th crossing and the i+1 crossing split in direction, arterial highway is gi, protect
Card capacity matching.
The optimization method of signal coordinated control under the urban road intersection supersaturated condition of the present invention, believes at crossing single-point
Number control on the basis of, using the signal phase difference at upstream and downstream crossing as important parameter, carry out the queuing overflow control at crossing,
Symbol is defined as follows:
(1) distance of junction spacing L: two adjacent intersection, takes during calculating and stops from crossing, upstream stop line to downstream road junction
The distance of line.
(2) queue length q: the queue that downstream road junction green light start time queuing vehicle upstream extends from stop line is long
Degree.
(3) phase difference Τ: the minimum interval of upstream and downstream crossing green light start time.
(4) effectively transit time gi: effective transit time at crossing is green time and yellow time sum.
(5) flow Q is sailed at crossing, upstream intoi: roll the vehicle fleet of crossing, upstream stop line in the unit interval away from.
(6) speed v is sailed at crossing, upstream intoi: speed when wagon flow sails crossing, upstream into.
(7) crossing, upstream vehicle density ki: wagon flow rolls crossing, upstream stop line unit length road vehicle number away from.
(8) downstream road junction rolls flow Q away fromi+1: roll the vehicle fleet of downstream road junction stop line in the unit interval away from.
(9) downstream road junction rolls speed v away fromi+1: vehicle rolls spot spe J during downstream road junction stop line away from.
(10) vehicle density k is rolled in downstream away fromi+1: wagon flow rolls downstream road junction stop line unit length road vehicle number away from.
(11) jam density kj: it is unit length road vehicle number that wagon flow is queued up slack.
(12) evanescent wave w1: the speed that wagon flow is propagated from the static state becoming startup optimization of queuing up to fleet rear.
(13) ripple w is blocked2: wagon flow is become, from operation, the static state speed to fleet's rear propagation of queuing up.
The optimization method of signal coordinated control under the urban road intersection supersaturated condition of the present invention, operating procedure is such as
Under: (seeing Fig. 2)
1, road section traffic volume status data collection processes:
Function: be calculated the vehicle flowrate at crossing, travel speed and traffic density data
Input: saturation headway and car speed；
Output: saturation volume, vehicle average overall travel speed and vehicle density.
2, crossing condition discrimination
Function: the data obtained in processing according to road section traffic volume status data collection, it is judged that whether reliability interval exists
Input: saturation volume, vehicle average overall travel speed and vehicle density；
Output: traffic state at road cross, it is determined that whether reliability interval exists.
3, reliability interval computation
Function: the reliability obtaining phase contrast is interval
Input: dissipation velocity of wave, obstruction velocity of wave, long green light time, junction spacing and section vehicle average overall travel speed；
Output: reliability is interval.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both fall within scope of the claimed invention, claimed scope by appending claims and
Equivalent defines.
Claims (3)
1. the optimization method of signal coordinated control under a urban road intersection supersaturated condition, it is characterised in that it includes
Following steps:
(1) on the basis of collecting road section traffic volume flow data, evanescent wave w is calculated respectively1With obstruction ripple w2；
(2) if w1≥w2, terminate；
(3) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall on two sections in the middle of crossings, then it represents that arterial highway side
To spillover does not occur, the phase contrast coordinating to control by general signal processes；
(4) if w1＜ w2If, evanescent wave w1With obstruction ripple w2Intersection point fall or the upstream at i-th crossing, then table internal at the i-th crossing
Show that direction, arterial highway has occurred and that spilling；
(5) formula is passed through: xB≤gi+ Δ T and yA≤ 0, calculate reliability interval Δ T:
Wherein, evanescent wave w1The speed propagated from the static state becoming startup optimization of queuing up to fleet rear for wagon flow；Block ripple
w2Become, from operation, the static state speed to fleet's rear propagation of queuing up for wagon flow；viSpeed is sailed into for crossing, upstream；L is
Junction spacing, q is queue length, xBFor traveling to time at the i-th crossing from timing start time to starting ripple；giFor from timing
The time that start time terminates to the i-th crossing red light；yAFor evanescent wave and the intersection point of obstruction ripple.
2. the optimization method of signal coordinated control under urban road intersection supersaturated condition as claimed in claim 1, it is special
Levy and be, the induction coil at the i-th crossing every the saturation headway t produced at the green light initial stageijAnd speed vijData obtain
Arrive:
The average saturation headway at the i-th crossing:
The saturation volume at the i-th crossing:
The vehicle average overall travel speed at the i-th crossing:
I-th crossing vehicle enters the vehicle density at crossing:
Wherein, n is the number of the valid data obtained, and can obtain the saturation volume Q at i+1 crossing the most according to thisi+1, i+1
The vehicle average overall travel speed v at crossingi+1Vehicle density k with i+1 crossingi+1, thus obtain:
Evanescent wave:
Obstruction ripple:
3. the optimization method of signal coordinated control under urban road intersection supersaturated condition as claimed in claim 1, it is special
Levying and be, between the i-th crossing and i+1 crossing, the signal control cycle is equal, it is achieved the coordination between adjacent two crossings controls.
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Effective date of registration: 20180601 Address after: 200092 room 102-4, Tongji Science and Technology Park, 65 Chifeng Road, Yangpu District, Shanghai. Patentee after: Shanghai Ji'an Traffic Engineering Consultation Co., Ltd. Address before: 200092 room 118, 2 building, Tongji Science and Technology Park, 65 Chifeng Road, Yangpu District, Shanghai. Patentee before: Shanghai Jixiang Intelligent Transportation Technology Co., Ltd. |
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