CN108961783A - A kind of indirect optimal control method of rotary island based on the control of upstream intersection - Google Patents

A kind of indirect optimal control method of rotary island based on the control of upstream intersection Download PDF

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CN108961783A
CN108961783A CN201811028446.XA CN201811028446A CN108961783A CN 108961783 A CN108961783 A CN 108961783A CN 201811028446 A CN201811028446 A CN 201811028446A CN 108961783 A CN108961783 A CN 108961783A
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China
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rotary island
traffic
congestion
intersection
upstream intersection
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CN201811028446.XA
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CN108961783B (en
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杨庆芳
赵小辉
林赐云
龚勃文
方云峰
栾思良
张帆
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吉林大学
林赐云
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    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/07Controlling traffic signals
    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/07Controlling traffic signals
    • G08G1/08Controlling traffic signals according to detected number or speed of vehicles
    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/07Controlling traffic signals
    • G08G1/081Plural intersections under common control

Abstract

The present invention relates to urban traffic signal control fields, and in particular to a kind of indirect optimal control method of rotary island based on the control of upstream intersection.A kind of indirect optimal control method of rotary island based on the control of upstream intersection proposed by the present invention, it is intended to from the angle of demand control, optimize the operation of traffic circle indirectly, provide a kind of new thinking for the traffic control of traffic circle.The present invention includes three modules: information acquisition module, condition discrimination module, coordinating control module.Three modules cooperate according to control flow, demand control is carried out to the traffic flow for flowing to rotary island from source, and dissipation environment is established in the traffic flow for outflow rotary island, the coordination optimization for realizing traffic circle and ambient signal intersection indirectly, provides optimisation strategy for the traffic circle under high demand condition.

Description

A kind of indirect optimal control method of rotary island based on the control of upstream intersection
Technical field
The present invention relates to urban traffic signal control fields, and in particular to it is a kind of based on upstream intersection control rotary island between Connect optimal control method.
Background technique
Traffic circle is a kind of common traffic organization form, when vehicle is run herein, converts intertexture for conflict point Area, thus extremely excellent performance is shown in terms of traffic safety and exhaust emissions.However, with traffic circle entrance The increase of flow, is easily in the presence of local congestion in this traffic organization, if cannot evacuate in time, it will get congestion Diffusion, can break out the regional traffic congestion of large area when serious.When facing this problem, part traffic administration person advocates to tear open Except rotary island, reconstruct into signalized intersection, this method is not only expending a large amount of economic cost, but also is not suitable for more The complicated traffic circle on road.Therefore, when traffic circle is in high need state, the operation of rotary island is optimized Inexorable trend as traffic circle.
The running optimizatin of rotary island, mainstream research mostly concentrates in terms of being directly controlled to rotary island, but this method, Either the acquisition of signal set-up mode or timing method is all more single, and do not account for rotary island and its upstream other Regional traffic is isolated the balance that the whole wagon flow operation in region is had ignored for single intersection by the linkage of signalized intersections Property.
In order to while optimizing rotary island traffic efficiency, guarantee that the overall operation of local traffic network is normal, by adjusting The signal time distributing conception and signal timing dial parameter of traffic circle upstream intersection, from the angle of demand control, indirectly Optimize rotary island traffic circulation strategy, the invention proposes it is a kind of based on upstream intersection control rotary island optimal control method, On the basis of studying rotary island and upstream intersection regional relation, coordinated control is carried out to rotary island upstream intersection, is guaranteeing area Under the premise of domain network operates normally, demand control is carried out to the traffic flow for flowing to rotary island from source, and be outflow rotary island Dissipation environment is established in traffic flow, realizes the coordination optimization of traffic circle and ambient signal intersection indirectly, is high demand condition Under traffic circle provide optimisation strategy.
Summary of the invention
The present invention is that traffic circle traffic circulation to be provides indirect Optimal Control Strategy, and solves existing controlling party Method ignores the problem of linkage of the rotary island with its other signalized intersections of upstream, guarantees that the overall operation of local traffic network is normal And a kind of indirect optimal control method of rotary island based on the control of upstream intersection provided.Such as Fig. 1, one kind being based on upstream intersection The indirect optimal control method of the rotary island of control, it is divided into three modules: information acquisition module, condition discrimination module, coordinated control Module.
Information acquisition module acquires rotary island traffic flow parameter, carries out the congestion status of rotary island by coil checker is laid Differentiate.The data packet for needing to acquire includes, the traffic amount of reach q of entrance area ii, detector time occupancy Oi, traffic circle The queue length L of each entrance of mouth, based on the above-mentioned requirement to information acquisition module, the laying of detector is as shown in Fig. 2, import Maximum queue length L of the road Loop detector layout in permissionmaxPlace, exit ramp detector are then laid in rotary island exit;
Condition discrimination module needs to be differentiated according to the congestion status of rotary island as a result, triggering the coordinated control of coordinating control module System, coordinated control mechanism is not when rotary island shows, enters ring jam situation, in a dormant state, goes out, enters once rotary island occurs Ring congestion then needs to start coordinated control mode, and condition discrimination module is divided into two steps: firstly the need of sentence into ring congestion Not, that is, the queue length L for judging the detection of entrance driveway detector, if L > Lmax, then meet trigger condition, in addition also need to carry out out ring Congestion differentiates, that is, the traffic congestion state in exit is judged, if traffic intensity Ii>IIt is critical, then meet trigger condition, it is above-mentioned two Trigger condition meets wherein any one i.e. triggerable coordinated control mode.
Coordinating control module needs to complete three tasks, firstly, being associated with rotary island as a result, filtering out according to condition discrimination One or more upstream intersections for being adjusted of needs, and the regional relation of upstream intersection is analyzed, then, according to coordination Rule calculates the signal time distributing conception of upstream intersection.Complete upstream intersection signal timing scheme is finally output to traffic In signal controlling machine.
Compared with prior art, the beneficial effects of the present invention are: having formulated the coordination of traffic circle Yu upstream intersection Trigger differentiation mechanism, by the coordination optimization of upstream intersection traffic parameter, establish the period, long green light time, phase difference tune Adjusting method optimizes the operation of traffic circle from the angle of demand control indirectly, provides for the traffic control of traffic circle A kind of new thinking.
Detailed description of the invention
Fig. 1: the indirect optimal control method functional module structure figure of rotary island;
Fig. 2: information acquisition module traffic circle induction coil Loop detector layout method figure;
Fig. 3: figure is arranged in the optimization phase of traffic circle upstream intersection;
Fig. 4: the indirect optimal control logical flow chart of rotary island based on the control of upstream intersection.
Specific embodiment
A kind of multiple branch circuit traffic circle self-adapting traffic signal control method of present embodiment, it is real according to the following steps It is existing:
Step 1: in traffic circle, each entrance lays coil checker, and a typical shape intersection includes m and enters Mouth, m outlet, in the maximum queue length L that each entrance of multichannel traffic circle, outlet and entrance driveway allowmaxLocate cloth If induction coil detector, the length and width of detector are 2.0m.Wherein at the entrance and exit of traffic circle, detector cloth It is located at the position of 0.5m after the stop line of lane, and the maximum queue length L allowed in entrance drivewaymaxPlace, Loop detector layout is in road On center line.As shown in Fig. 2, the present invention specifically illustrates detection by taking the traffic circle of typical five branch as an example The laying mode of device, after laying, defining entry number indicates that exit numbers are indicated with i with m;
Step 2: judging whether each entry and exit of traffic circle occur traffic congestion, so that it is determined that coordinated control is No triggering.The step in, changed to any one entrance and be determined as congestion, then triggered this entrance upstream intersection Coordinated control.
Step 2.1: the queue length L of the detection each entrance m in traffic circlemIf Lm≥Lmax, then it is denoted as traffic circle Entrance m traffic behavior is congestion Cm=1, if Lm<Lmax, show entrance m not congestion, then traffic behavior is expressed as Cm=0.
Step 2.2: the congestion status of rotary island outlet being differentiated, using traffic intensity IiThe traffic shape of judgement outlet i State, IiCalculation method it is as follows:
Wherein: IiThe traffic intensity of region i, dimensionless;qiThe traffic amount of reach of region i, veh/h;SiThe region upstream i Saturation release rate, veh/h;OiThe detector time occupancy of region i, dimensionless;OsiThe detection of region i under saturation state Device time occupancy, dimensionless;θ-weight coefficient, dimensionless;
Differentiated by calculated result, if Ii≥IIt is critical, then being denoted as traffic circle outlet i traffic behavior is congestion Cm= 1, if Ii<IIt is critical, show to export i not congestion, then traffic behavior is expressed as Cm=0.All differentiation results are summarized, if any one There is the congestion status of C=1 in a entry and exit, then trigger coordinated control mechanism, enter step 3.Otherwise, process terminates, without into The coordinated control of row upstream intersection.
Step 3: filter out each entry and exit that traffic circle is determined as congestion, find these entry and exit it is corresponding on Intersection is swum, these stream signal intersections are the optimization object of coordinated control.
Step 4: the signal time distributing conception for the upstream intersection for needing to carry out coordinated control being optimized, here includes letter Number phase, the optimization in period, crucial long green light time, phase difference, specific Optimizing Flow are as follows:
Step 4.1: the signal phase of the corresponding upstream intersection in optimization congestion entry and exit, congestion entrance upstream intersect Mouth preferably uses Four-phase control mode, and as shown in Fig. 3, general there are two types of setting methods, when same rotary island for signal phase setting Entrance when single entrance driveway jam situation only occurs, preferably uses the first control program in Fig. 3 to subtract in this case Small upstream intersection flows into the key flow long green light time of rotary island, can certainly will also reduce the resolution time of the wagon flow of rotary island outflow, According to this phase mode, it should be noted that the corresponding outlet of rotary island entrance driveway is avoided to generate congestion.
And when working as same rotary island entrance, when inlet and outlet lane gets congestion simultaneously, then need using second in Fig. 3 Control mode.This phase control schemes flow out the key flow that upstream intersection flows into rotary island with from rotary island, into the friendship The key flow of prong is divided in two different phases, so adjustment simultaneously includes the green of the phase of this two strands of key flows Lamp duration can reach the inflow flow for not only having reduced rotary island import, but also increase the purpose of the outflow flow of rotary island outlet, to allow The traffic congestion of rotary island inlet and outlet quickly and effectively dissipates.
Step 4.2: the signal period of the corresponding upstream intersection in optimization congestion entry and exit, if obtained by condition discrimination It is only to need to carry out coordinated control to the upstream intersection of rotary island to result, original signal cycle duration can be kept, but It is if necessary to carry out coordinated control to multiple upstream intersections, then the upstream intersection for needing to optimize will take unified The solution of common period, common period takes the maximum cycle of each signalized intersections as the common period of coordinated control, as follows:
Cnew=max { C1,C2,L,CiI=2,3,4L n
Wherein: CnewCommon signal period after coordination, s;CiThe stream signal intersection that-i-th needs adjust is original Cycle duration, s;
Step 4.3: the key signal phase long green light time of the corresponding upstream intersection in optimization congestion entry and exit, key here Phase refers to that the corresponding phase of key flow of flow rotary island entrance or rotary island outlet are lined up wagon flow and dissipate in downstream intersection Signal phase.
When rotary island enters ring congestion, need the demand by reducing upstream intersection come the rotary island entrance driveway that dissipates Queuing vehicle, that is, the flow for flowing into straight trip, left-hand rotation, right-turning vehicles the inflow rotary island of rotary island by reducing upstream intersection, The queuing vehicle of dissipation entrance overrun is not considering that there is the case where Shared Lane of left-hand rotation, straight trip, right-hand rotation in upstream intersection Under, it is as follows to the resolution time modeling of entrance driveway queuing vehicle:
Wherein:
TeThe resolution time of-entrance driveway queuing vehicle, s;
Le,maxThe maximum queue length that-import lane congestion is traced back, m;
Le,a- enter the acceptable queue length of ring, m;
- be averaged space headway, m;
Ne- enter the number of track-lines of ring, it is a;
C-upstream intersection signal cycle duration, s;
qe- average traffic dissipation rate when entering ring, dimensionless;
- upstream intersection enters the left-turning traffic flow of rotary island, pcu/h;
- upstream intersection enters the corresponding long green light time of left turn traffic of rotary island, s;
- upstream intersection enters the straight-going traffic flow of rotary island, pcu/h;
- upstream intersection enters the corresponding long green light time of straight traffic of rotary island, s;
- upstream intersection enters the right-hand rotation magnitude of traffic flow of rotary island, pcu/h;
When generation rotary island goes out ring congestion, need the supply amount by increasing outlet downstream intersection come rotary island import of dissipating The queuing vehicle in road, that is, the transit time of downstream intersection flow corresponding phase is flowed to by increasing rotary island come outlet of dissipating The vehicle flowrate in lane arranges exit ramp in the case where not considering that there is the Shared Lane of left-hand rotation, straight trip, right-hand rotation in upstream intersection The resolution time modeling of team's vehicle is as follows:
Wherein:
TexThe resolution time of-exit ramp queuing vehicle, s;
Lex,maxThe maximum queue length that the congestion of-exit lane is traced back, m;
Lex,a- go out the acceptable queue length of ring, m;
Nex- go out ring number of track-lines, it is a;
qex- go out ring when average traffic dissipation rate, dimensionless;
The saturation of left turning vehicle discharges flow rate, pcu/h at-exit ramp stop line;
The saturation of through vehicles discharges flow rate, pcu/h at-exit ramp stop line;
The saturation of right-turning vehicles discharges flow rate, pcu/h at-exit ramp stop line;
It is anticipated that resolution time, calculate upstream intersection and correspond to the vehicle flowrate of key flow in one cycle, According to the Webster theorem of signal timing dial, half step distance adjustment, new green light adjusted are carried out to the signal duration in each period Duration calculation method is as follows:
Wherein:
The long green light time of i entrance driveway j phase, s after-coordination
CnewCommon period after-coordination, s
The flow-rate ratio of-i entrance driveway j phase, dimensionless;
Step 4.4: setting upstream intersection key signal phase green light gradual change principle.Between rotary island based on the control of upstream intersection Connect optimal control method, fundamentally from the point of view of, be a kind of coordination approach based on demand control, but centered on rotary island During coordination optimization, although the traffic efficiency of the upstream intersection of fraction can be sacrificed, it is also required to guarantee that these are flat Face intersection can normally pass through, that is, adjusting cannot be unlimited, needs to meet certain limit value.Otherwise, only will The congestion of rotary island is upstream shifted, rather than congestion of really dissipating.Will lead to congestion in this way, upstream intersection carries out Lasting diffusion, also can initiation area congestion.
In order to meet above-mentioned requirement, that is, guarantee reduction demand and increase supply amount to limit in range, we The key signal phase green light gradual change principle of multistep and half step distance, each signal period, the adjustment amount of long green light time can be taken Calculation method is as follows:
△ g=min { △ gmax,|gNew-g|}
Wherein:
Mono- signal period of △ g-, the coordination value of long green light time, s;
△gmax- one signal period, long green light time allow the maximum value adjusted, s;
gNewThe new key signal phase long green light time solved according to resolution time, s;
The original long green light time of the g- key signal phase, s;
After the adjustment in N number of period, the queuing vehicle of rotary island entrance gradually dissipates, in this process, single week The long green light time of phase needs to meet following condition:
Wherein:
The long green light time in k-th of period of g (k)-, s;
G (k-1)--1 period of kth long green light time, s;
gmaxAfter-adjustment, the maximum long green light time of permission, s;
Step 4.4: solving the phase difference of upstream intersection and rotary island coordination optimization.For reaching the multiply of same inlet and outlet It for wagon flow, needs that phase difference is adjusted, multiply wagon flow is made to have interval and orderly arrival rotary island.Here phase difference Different in processing method with the phase difference in traditional Trunk Road Coordination and regional coordination, it is two intersection distances, Long green light time reaches obtained by the multiple parameters collective effect of flow, and calculation method is as follows:
Wherein:
φaThe corresponding phase difference of-a import, s
laThe distance between the intersection-a and rotary island, m;
- vehicle reaches the average speed of rotary island, m/s from upstream intersection;
Step 5: establishing objective function, using the throughput of traffic circle as objective function, solve the optimal feelings of objective function The optimal solution of each control parameter under condition, traffic circle throughput can be obtained approximately using the sum of flow of each outlet It arrives:
Wherein:
MaxQRThe maximum throughput of-traffic circle, veh;
Qex,iThe outlet-rotary island i goes out the ring volume of traffic, veh;
Step 6: the signal timing dial parameter after obtained upstream intersection optimizes will be solved and inputted in control system, to rotary island Operation optimize after, return step 2, circulation execute.

Claims (1)

1. a kind of indirect optimal control method of rotary island based on the control of upstream intersection, it is characterised in that:
Step 1: in traffic circle, each entrance lays coil checker, and a typical shape intersection includes m entrance, m A outlet, in the maximum queue length L that each entrance of multichannel traffic circle, outlet and entrance driveway allowmaxLay sense in place Coil checker is answered, the length and width of detector are 2.0m;Wherein at the entrance and exit of traffic circle, Loop detector layout exists The position of 0.5m after the stop line of lane, and the maximum queue length L allowed in entrance drivewaymaxPlace, the Loop detector layout heart in the road On line;Defining traffic circle entry number indicates that exit numbers are indicated with i with m;
Step 2: judging whether each entry and exit of traffic circle occur traffic congestion, so that it is determined that whether coordinated control touches Hair;The step in, changed to any one entrance and be determined as congestion, then triggered the coordination of this entrance upstream intersection Control;
Step 2.1: the queue length L of the detection each entrance m in traffic circlemIf Lm≥Lmax, then it is denoted as traffic circle entrance M traffic behavior is congestion Cm=1, if Lm<Lmax, show entrance m not congestion, then traffic behavior is expressed as Cm=0;
Step 2.2: the congestion status of rotary island outlet being differentiated, using traffic intensity IiThe traffic behavior of judgement outlet i, Ii Calculation method it is as follows:
Wherein: IiThe traffic intensity of region i, dimensionless;qiThe traffic amount of reach of region i, veh/h;SiSatisfy the region upstream i And release rate, veh/h;OiThe detector time occupancy of region i, dimensionless;OsiUnder saturation state when the detector of region i Between occupation rate, dimensionless;θ-weight coefficient, dimensionless;
Differentiated by calculated result, if Ii≥IIt is critical, then being denoted as traffic circle outlet i traffic behavior is congestion Cm=1, if Ii<IIt is critical, show to export i not congestion, then traffic behavior is expressed as Cm=0;All differentiation results are summarized, if any one There is the congestion status of C=1 in entry and exit, then trigger coordinated control mechanism, enter step 3;Otherwise, process terminates, without carrying out The coordinated control of upstream intersection;
Step 3: filtering out each entry and exit that traffic circle is determined as congestion, find the corresponding upstream in these entry and exit and hand over Prong, these stream signal intersections are the optimization object of coordinated control;
Step 4: the signal time distributing conception for the upstream intersection for needing to carry out coordinated control being optimized, here includes signal phase Position, the optimization in period, crucial long green light time, phase difference, specific Optimizing Flow are as follows:
Step 4.1: the signal phase of the corresponding upstream intersection in optimization congestion entry and exit, congestion entrance upstream intersection are suitable Using Four-phase control mode, generally there are two types of setting methods only occurs single entrance driveway congestion when same rotary island entrance When situation, reduce the key flow long green light time that upstream intersection flows into rotary island, can certainly will also reduce the wagon flow of rotary island outflow Resolution time, according to this phase mode, it should be noted that the corresponding outlet of rotary island entrance driveway is avoided to generate congestion;
And work as same rotary island entrance, when inlet and outlet lane gets congestion simultaneously, upstream intersection is flowed into the crucial vehicle of rotary island Stream is flowed out with from rotary island, and the key flow into the intersection is divided in two different phases, so adjustment includes simultaneously The long green light time of the phase of this two strands of key flows can reach the inflow flow for not only having reduced rotary island import, but also increase rotary island and go out The purpose of the outflow flow of mouth, so that the traffic congestion for allowing rotary island to import and export quickly and effectively dissipates;
Step 4.2: the signal period of the corresponding upstream intersection in optimization congestion entry and exit, if tied by condition discrimination Fruit is only to need to carry out coordinated control to the upstream intersection of rotary island, can keep original signal cycle duration, but such as Fruit needs to carry out multiple upstream intersections coordinated control, then the upstream intersection for needing to optimize will take the public of unification The solution in period, common period takes the maximum cycle of each signalized intersections as the common period of coordinated control, as follows:
Cnew=max { C1,C2,L,CiI=2,3,4Ln
Wherein: CnewCommon signal period after coordination, s;Ci- i-th stream signal intersection original period for needing to adjust Duration, s;
Step 4.3: the key signal phase long green light time of the corresponding upstream intersection in optimization congestion entry and exit, key signal phase here The corresponding phase of key flow or rotary island outlet for referring to flow rotary island entrance are lined up the letter that wagon flow dissipates in downstream intersection Number phase;
When rotary island enters ring congestion, need the demand by reducing upstream intersection come the queuing for the rotary island entrance driveway that dissipates Vehicle, that is, the flow for flowing into straight trip, left-hand rotation, right-turning vehicles the inflow rotary island of rotary island by reducing upstream intersection, dissipate The queuing vehicle of entrance overrun, in the case where not considering that there is the Shared Lane of left-hand rotation, straight trip, right-hand rotation in upstream intersection, It is as follows to the resolution time modeling of entrance driveway queuing vehicle:
Wherein:
TeThe resolution time of-entrance driveway queuing vehicle, s;
Le,maxThe maximum queue length that-import lane congestion is traced back, m;
Le,a- enter the acceptable queue length of ring, m;
- be averaged space headway, m;
Ne- enter the number of track-lines of ring, it is a;
C-upstream intersection signal cycle duration, s;
qe- average traffic dissipation rate when entering ring, dimensionless;
- upstream intersection enters the left-turning traffic flow of rotary island, pcu/h;
- upstream intersection enters the corresponding long green light time of left turn traffic of rotary island, s;
- upstream intersection enters the straight-going traffic flow of rotary island, pcu/h;
- upstream intersection enters the corresponding long green light time of straight traffic of rotary island, s;
- upstream intersection enters the right-hand rotation magnitude of traffic flow of rotary island, pcu/h;
When generation rotary island goes out ring congestion, need the supply amount by increasing outlet downstream intersection come the rotary island entrance driveway that dissipates Queuing vehicle, that is, the transit time of downstream intersection flow corresponding phase is flowed to by increasing rotary island come the exit lane that dissipates Vehicle flowrate, in the case where not considering that there is the Shared Lane of left-hand rotation, straight trip, right-hand rotation in upstream intersection, to exit ramp be lined up vehicle Resolution time modeling it is as follows:
Wherein:
TexThe resolution time of-exit ramp queuing vehicle, s;
Lex,maxThe maximum queue length that the congestion of-exit lane is traced back, m;
Lex,a- go out the acceptable queue length of ring, m;
Nex- go out ring number of track-lines, it is a;
qex- go out ring when average traffic dissipation rate, dimensionless;
The saturation of left turning vehicle discharges flow rate, pcu/h at-exit ramp stop line;
The saturation of through vehicles discharges flow rate, pcu/h at-exit ramp stop line;
The saturation of right-turning vehicles discharges flow rate, pcu/h at-exit ramp stop line;
It is anticipated that resolution time, calculate upstream intersection and correspond to the vehicle flowrate of key flow in one cycle, according to The Webster theorem of signal timing dial carries out half step distance adjustment, new long green light time adjusted to the signal duration in each period Calculation method is as follows:
Wherein:
The long green light time of i entrance driveway j phase, s after-coordination
CnewCommon period after-coordination, s
The flow-rate ratio of-i entrance driveway j phase, dimensionless;
Step 4.4: setting upstream intersection key signal phase green light gradual change principle;Rotary island based on the control of upstream intersection is indirectly excellent Change control method, fundamentally from the point of view of, be a kind of coordination approach based on demand control, but in the coordination centered on rotary island In optimization process, although the traffic efficiency of the upstream intersection of fraction can be sacrificed, it is also required to guarantee that these planes are handed over Prong can normally pass through, that is, adjusting cannot be unlimited, needs to meet certain limit value;Otherwise, only by rotary island Congestion upstream shifted, rather than congestion of really dissipating;Will lead to congestion in this way, upstream intersection is continued Diffusion, also can initiation area congestion;
In order to meet above-mentioned requirement, that is, guarantee reduction demand and increase supply amount to limit in range, we can be with The key signal phase green light gradual change principle of multistep and half step distance is taken, the adjustment amount of each signal period, long green light time calculate Method is as follows:
△ g=min { △ gmax,|gNew-g|}
Wherein:
Mono- signal period of △ g-, the coordination value of long green light time, s;
△gmax- one signal period, long green light time allow the maximum value adjusted, s;
gNewThe new key signal phase long green light time solved according to resolution time, s;
The original long green light time of the g- key signal phase, s;
After the adjustment in N number of period, the queuing vehicle of rotary island entrance gradually dissipates, in this process, signal period Long green light time needs to meet following condition:
Wherein:
The long green light time in k-th of period of g (k)-, s;
G (k-1)--1 period of kth long green light time, s;
gmaxAfter-adjustment, the maximum long green light time of permission, s;
Step 4.4: solving the phase difference of upstream intersection and rotary island coordination optimization;For reaching the multiply wagon flow of same inlet and outlet For, it needs that phase difference is adjusted, multiply wagon flow is made to have interval and orderly arrival rotary island;Here phase difference and biography Phase difference in the Trunk Road Coordination and regional coordination of system is different in processing method, it is two intersection distances, green light Duration reaches obtained by the multiple parameters collective effect of flow, and calculation method is as follows:
Wherein:
φaThe corresponding phase difference of-a import, s
laThe distance between the intersection-a and rotary island, m;
- vehicle reaches the average speed of rotary island, m/s from upstream intersection;
Step 5: establishing objective function, using the throughput of traffic circle as objective function, solve under objective function optimal situation The optimal solution of each control parameter, traffic circle throughput can be obtained approximately using the sum of the flow of each outlet:
Wherein:
MaxQRThe maximum throughput of-traffic circle, veh;
Qex,iThe outlet-rotary island i goes out the ring volume of traffic, veh;
Step 6: the signal timing dial parameter after obtained upstream intersection optimizes will be solved and inputted in control system, to the fortune of rotary island After row optimizes, return step 2, circulation is executed.
CN201811028446.XA 2018-09-05 2018-09-05 Roundabout indirect optimization control method based on upstream intersection control CN108961783B (en)

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