CN109377753B - Trunk line coordination optimization method for repeatedly releasing in coordination direction - Google Patents
Trunk line coordination optimization method for repeatedly releasing in coordination direction Download PDFInfo
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Abstract
The invention provides a trunk line coordination optimization method for coordinating direction repeated release, which is characterized in that a time distance graph is drawn on the basis of an intersection signal control scheme, repeated release conditions in an intersection common period are identified, each condition is solved based on a trunk line coordination model, and finally a trunk line coordination optimal scheme is obtained through comparison; the trunk line coordination optimization method for coordinating direction repeated release aims at the current situation that trunk line coordination in double periods and large and small periods at the current stage is manually judged and tested, the period research of the trunk line coordination on a coordinated intersection is considered by a common period, multiple coordination release phase stages existing in the common period are respectively taken as coordination stages to be solved, an optimal trunk line coordination scheme is obtained circularly, the trunk line coordination efficiency is greatly improved, and meanwhile, the efficient trunk line coordination optimization method is provided in the face of complex conditions that repeated release, overlapping phases and the like exist at the intersection originally.
Description
Technical Field
The invention relates to a trunk line coordination optimization method for repeatedly releasing in a coordination direction.
Background
Urban traffic signal control is an important component of urban traffic, and with the development of urbanization progress, the problem of traffic congestion becomes more and more serious, and trunk and regional signal coordination control becomes one of main research contents in recent years due to the advantages of the coordination control. In particular, the main line coordination control has obtained a well-known effective way for reducing intersection delay in all countries in the world due to the advantages of improving the main line traffic speed, reducing the number of times of parking, reducing the red light running phenomenon and the probability of rear-end accidents.
"repeat pass" refers to the case where a pass phase can pass at multiple stages within a signal cycle. At the present stage, trunk line coordination optimization is carried out by a traffic communication control engineer through trunk line current situation investigation and optimized adjustment by using methods such as a maximum green wave band MAXBAND model and a multi-green wave bandwidth MULTIBAND model, wherein the public cycle duration of a trunk line and the signal cycle duration of each road junction are configured by the traffic communication control engineer through experience. The method for optimizing configuration by taking experience as the leading part is low in efficiency and consumes a large amount of manpower, communication control engineers need to be tested and adjusted continuously according to experience, if the signal control scheme of a certain intersection has the condition of 'multiple release', the 'repeated release' in the period of the trunk line coordination public signal provides a greater difficulty requirement for trunk line coordination optimization, and the selection of which green light duration is taken as the coordination stage becomes a big problem. Aiming at the situation of repeated release of the coordination direction in a common period, how to realize automatic optimization of trunk coordination is one of important researches on improving the trunk coordination efficiency.
Disclosure of Invention
The invention aims to provide a trunk line coordination optimization method for repeatedly releasing coordination direction, which aims at the situation of repeatedly releasing coordination direction in a public period, improves the efficiency of trunk line coordination optimization in the repeated direction, reduces the workload of communication control personnel, and solves the problem that the trunk line coordination requires multiple times of adjustment and test optimization by personnel according to experience under the complex situation of the current stage in the prior art.
The technical solution of the invention is as follows:
a trunk line coordination optimization method for coordinating direction repeated release is characterized by drawing a time distance graph on the basis of collecting an intersection signal control scheme, identifying repeated release conditions in an intersection common period, solving each condition based on a trunk line coordination model respectively, and finally comparing to obtain a trunk line coordination optimal scheme; comprises the following steps of (a) carrying out,
s1, a traffic signal control system is docked, basic information and a signal control scheme of the intersections are collected, and a coordination trunk line and the coordination direction of each intersection are determined;
s2, determining a common period and the period duration of each intersection based on the signal control scheme of each intersection of the coordinated trunk line, and optimizing the signal control timing scheme of each coordinated intersection;
s3, identifying repeated passing of the road junction coordination direction based on drawing of the coordination trunk line time distance graph, and determining the passing times N of the coordination direction in the trunk line positive direction public period;
s4, solving parameter indexes related to signal timing of each signal control intersection under the condition that the green light duration of a certain section in the public period is set as the coordination phase respectively based on the passing times N in the public period of the forward and reverse coordination direction determined in the step S3;
and S5, circularly solving the optimal solution of the bandwidth and the phase difference between the intersections based on the public period coordination passing times, namely the optimal trunk line coordination scheme.
Further, in step S2, specifically,
s21, integrating the signal control schemes of each coordinated intersection to determine the cycle duration of each intersection, specifically, determining the common cycle duration C, and determining the cycle duration C of the existing intersection signal control schemeiCompared with the common period C, determining the intersection which can be configured to be double periods or big periods and the period duration C'i；
And S22, optimizing the configuration scheme of each intersection based on the maximum green light duration/the minimum green time duration of the phase stage in the signal control scheme in the step S1 and the period duration obtained in the step S21.
Further, in step S22, specifically,
s221, optimizing the adjusted intersection period c 'according to the step S21'iPeriod c of crossing with originaliPhase green time ratio alpha ofiThe green light time length g 'of the phase stage is obtained through proportion adjustment'ij；
S222, controlling the maximum green light time length of each phase stage based on the signal
And minimum green light duration
Phase stage green light duration g 'obtained by solving step S221'ijAnd (6) adjusting.
Further, in step S221, the green duration of each phase stage is:
g′ij＝αi*gij
in formula (II), g'ijThe adjusted green light duration g of j phase stage at i intersectionijFor the initial green duration, alpha, of the j phase stage at the i intersectioniIs green time proportion of phase at intersection i'iFor adjusted cycle duration, ciIs the initial cycle duration; meanwhile, if the intersection traffic signal control scheme has a locked phase, the phase green-time ratio value alphaiGreen light time length g of needing to eliminate locking phase during solvingI lockNamely:
further, in step S222, specifically,
s2221, if the adjusted green duration of the phase stage is optimized
The green time of the j phase at the i intersection is reduced to the maximum green time
Reduced green light duration by green time ratio betaijThe phase of the phase-unadjusted stage is expanded to within the period, namely the green light duration of the intersections except the coordination intersection on the coordination trunk line is as follows:
in the formula, betaijThe green time proportion of j phase stage at i intersection; gijThe initial green light duration of the j phase stage of the i intersection; c. CiIs the initial cycle duration; (g'ij) The green light duration of j stages in the cycle range of the i intersection after the locking phase is removed; meanwhile, if all the phase stages are greater than the maximum green light time, the intersection period time length is adjusted to be a public period;
s2222, if the green duration of the crossing phase stage is optimized and adjusted
The green time of j phase at i intersection is extended to the minimum green time
Increased green light duration by green time proportion betaijReducing the phases except the coordination phase in the period range, and meanwhile, if all the optimized phases are smaller than the minimum green light time, adjusting the period time of the intersection into a public period;
s2223, if the green duration of the crossing phase is adjusted preferentially
The flow goes directly to step S3 without adjustment.
Further, in step S3, specifically,
s31, summarizing the signal control schemes after the optimization adjustment of each trunk line at the intersection, drawing a time distance graph by taking the common period C as the period time length, the phase stage of the coordinated direction as the green light time length and the phase stage of the uncoordinated direction as the red light time length, thereby determining the red light time length T in the common period C of the forward and reverse directionsredRed light time period [ TOpening device，TKnot]And the red light time t in the red light time periodred(ii) a Wherein, the red light period [ T ]Opening device，TKnot]Refers to the time from the start of the red light to the arrival of the most recent phase-coordinated direction phase within the common period, where TOpening deviceAt the start of a red light, TKnotIs the starting time of the green light, and the red light time length t in the red light time periodred＝TOpening device—TKnot；
S32, comparing the red light time length t in the red light time periodredWith the duration T of the red light in the common period CredAnd determining the passing times N in the common period of the forward and reverse coordination directions.
Further, in step S32, specifically,
if the forward and reverse red light periods are equal to the red light duration in the common cycle C, i.e. tred＝TredIf the intersection is in the normal direction, the intersection can only pass once in no period, the passing frequency N is 1, and the red light center time T of the red light starting and ending time pair is storedInGo directly to step S4;
otherwise, marking the intersection to have repeated release flow direction, determining all red light starting and ending time pairs in the public cycle, namely the number of passing times N in the public cycle of forward and reverse coordination directions, and simultaneously respectively storing the red light center time in each group of red light time period
And proceeds to step S4.
Further, step S4 is specifically to find the number of passes N in the common period based on the forward and reverse coordination directionsForward and reverse red light time rate delta of intersection under each conditioninAnd the time rate delta from the center time of the forward red light to its approximate center time of the reverse red lightin(ii) a When the number of passing times N in the public period is more than or equal to 2, the green light time of a certain section in the public period is set as a coordination phase, and other green light times are set as red light times for solving, namely:
in the formula,. DELTA.inThe time rate of red light under the nth condition of the i intersection comprises the time rate of forward red light
And reverse red light time rate
The red light time length in the i-intersection common period C determined based on step S3; c is the duration of the public period; deltainThe time rate of the forward and reverse red light center time under the nth condition of the i intersection is obtained;
the center time of the forward red light under the nth condition of the i intersection;
the center time of the similar reverse red light under the nth condition of the i intersection.
Further, in step S4, for the intersection where the number of passes N in the common period is greater than or equal to 2, the green light duration of a certain segment in the common period is set as the coordination phase condition, and an intersection condition parameter index table is established, which includes the intersection number, the coordination direction, the condition number, the forward and reverse directions, the common period duration, the coordination time segment, the forward red light time rate, the reverse red light time rate, and the forward and reverse red light center time rate.
Further, in step S5, specifically,
s51, solving forward and reverse travel time according to the set forward and reverse speed, namely:
in the formula, LiIs the distance from intersection i to the next intersection, viFor forward and reverse vehicle speeds, TiIs the forward and reverse travel time;
s52, inputting the forward and reverse forming time of the step S51 and the parameter value solved in the step S4 into a trunk line coordination model, and circularly solving the bandwidth and the phase difference between intersections, wherein the circulating times are the passing times N in the common period of the forward and reverse coordination directions;
s53, solutions with the green light time length of a certain section in each public period as a coordination phase are summarized, the inter-intersection bandwidth and the phase difference with the maximum objective function are ranked, and the optimal solution is selected as a trunk coordination scheme.
The invention has the beneficial effects that: the trunk line coordination optimization method for coordinating direction repeated release aims at the current situation that trunk line coordination in double periods and large and small periods at the current stage is manually judged and tested, the period research of the trunk line coordination on a coordinated intersection is considered by a common period, multiple coordination release phase stages existing in the common period are respectively taken as coordination stages to be solved, an optimal trunk line coordination scheme is obtained circularly, the trunk line coordination efficiency is greatly improved, and meanwhile, the efficient trunk line coordination optimization method is provided in the face of complex conditions that repeated release, overlapping phases and the like exist at the intersection originally.
Drawings
Fig. 1 is a flowchart illustrating a trunk coordination optimization method for coordinating repeated release in a direction according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
Aiming at the problem of how to reasonably and efficiently optimize a trunk line coordination signal scheme by selecting a section of a coordination direction repeated release in a public period as a coordination stage, the embodiment provides a trunk line coordination optimization method for the coordination direction repeated release, which collects intersection basic information and scheme information, determines the period type of an intersection and optimizes an intersection traffic signal control scheme, identifies the repeated release stage in the public period on the basis, and respectively defaults each stage as the coordination stage to solve model parameters, thereby obtaining the optimal solution by depending on the circulation of a trunk line coordination model.
A trunk line coordination optimization method for coordinating direction repeated release is characterized in that a time distance graph is drawn on the basis of an intersection signal control scheme, repeated release conditions in an intersection common period are identified, all conditions are solved respectively on the basis of a trunk line coordination model, and finally a trunk line coordination optimal scheme is obtained through comparison. As shown in fig. 1, the method specifically comprises the following steps:
s1, a traffic signal control system is connected in a butt joint mode, basic information and a signal control scheme of intersections are collected, and a coordination trunk line and coordination directions of all the intersections are determined.
S11, collecting basic information and a signal control scheme of each intersection in a road network. Specifically, the basic information includes channelized characteristic information, detection device information, lamp group information, and a conventional traffic phase, and the signal control scheme specifically includes a scheduling plan, time interval division, and reference green light duration/maximum green light duration and minimum green light duration of each phase stage.
And S12, configuring the main line with the coordinated signals. Specifically, the coordinated signal control intersection and the coordinated direction of each intersection are determined, the distance between the coordinated intersections is solved, the forward/backward speed between the coordinated intersections is set, and then a specific signal control scheme is determined based on step S11.
S2, determining the time length of a common period and each intersection period based on the signal control scheme of each intersection of the coordinated trunk line, and optimizing the signal control timing scheme of each coordinated intersection.
S21, integrating the signal control schemes of all the coordinated intersections to determine the period duration of each intersection, wherein the traffic demand value is determined byAnd determining the traffic flow collected by the intersection detection equipment. Specifically, a common cycle duration C is determined, and the cycle duration C of the existing intersection signal control scheme is comparediCompared with the common period C, determining the intersection which can be configured to be double periods or big periods and the period duration C'i。
Generally speaking, according to the common knowledge of trunk line coordination optimization, the maximum period in the existing signal control scheme of each coordination intersection is taken as a common period C, and the intersection where the maximum period is located is defaulted as a key intersection for trunk line coordination. According to the ratio of the periods
Determining the cycle type of the intersection according to the size, wherein:
in the formula (I), the compound is shown in the specification,
is a period ratio; c. CiControlling the period duration of the scheme for the existing signal at the i intersection; c is the common period duration. Ratio of simultaneous periods
The corresponding cycle types are as follows.
And S22, optimizing the configuration scheme of each intersection based on the maximum green light time length/the minimum green time length of the phase stage in the signal control scheme in the step S1 and the period time length obtained in the step S21.
S221, optimizing the adjusted intersection period c 'according to the step S21'iPeriod c of crossing with originaliPhase green time ratio alpha ofiThe green light time length g 'of the phase stage is obtained through proportion adjustment'ij. Specifically, the green duration of each phase stage is:
g′ij＝ai*gij
in formula (II), g'ijThe adjusted green light duration g of j phase stage at i intersectionijFor the initial green duration, alpha, of the j phase stage at the i intersectioniIs green time proportion of phase at intersection i'iFor adjusted cycle duration, ciIs the initial cycle duration. Meanwhile, if the intersection traffic signal control scheme has a locked phase, the phase green-time ratio value alphaiGreen light time length g of needing to eliminate locking phase during solvingI lockI.e. by
S222, controlling the maximum green light duration of each phase stage of the scheme based on the signal
And minimum green light duration
Phase stage green light duration g 'obtained by solving step S221'ijAnd (6) adjusting.
Specifically, 1) if the adjusted phase stage green duration is optimized
The green time of the j phase at the i intersection is reduced to the maximum green time
Reduced green light duration by green time ratio betaijThe phase of the phase-unadjusted stage is expanded to within the period, namely the green light duration of the intersections except the coordination intersection on the coordination trunk line is as follows:
in the formula, betaijThe green time proportion of j phase stage at i intersection; gijThe initial green light duration of the j phase stage of the i intersection; c. CiIs the initial cycle duration; (g'ij) The green light duration of j stages in the cycle range of the i intersection after the locking phase is removed; meanwhile, if all the phase stages are greater than the maximum green light time, the intersection period time length is adjusted to be a public period;
2) if the green time length of the intersection phase stage is optimally adjusted
The green time of j phase at i intersection is extended to the minimum green time
Increased green light duration by green time proportion betaijReducing the phases except the coordination phase in the period range, and meanwhile, if all the optimized phases are smaller than the minimum green light time, adjusting the period time of the intersection into a public period;
3) if the green time length of the intersection phase stage is adjusted preferentially
The flow goes directly to step S3 without adjustment.
And S3, identifying repeated clearance of the road junction coordination direction based on the drawn coordination main line time distance graph, and determining the passing times N of the coordination direction in the main line positive direction public period.
S31, summarizing signal control schemes after optimization adjustment of each trunk line of the intersection, drawing a time distance graph by taking the common period C as period time, taking the phase stage of the coordinated direction as green light time, and taking the phase stage of the uncoordinated direction as red light time, and accordingly determining the red light time T in the common period C of the forward direction and the backward directionredRed light time period [ TOpening device，TKnot]And the red light time t in the red light time periodred. Specifically, the red light period [ TOpening device，TKnot]Refers to the time from the start of the red light to the arrival of the most recent phase-coordinated direction phase within the common period, where TOpening deviceAt the start of a red light, TKnotIs the starting time of the green light, and the red light time length t in the red light time periodred＝TOpening device—TKnot. Typically for repetitive directional conditions, there are multiple red light periods within the intersection common cycle.
If a timing scheme with a period of 100 seconds is adopted, the two common periods are 200s, the coordination direction in the forward direction is 50s, the red light starting and ending time pair is 50,100 and 150,200, and the red light duration of the red light starting and ending time pair is 50 s.
S32, comparing the red light time length t in the red light time periodredWith the duration T of the red light in the common period CredAnd determining the passing times N in the common period of the forward and reverse coordination directions.
Specifically, if the forward and reverse red periods are equal to the red period in the common cycle C, i.e., tred＝TredIf the intersection is in the normal direction, the intersection can only pass once in no period, the passing frequency N is 1, and the red light center time T of the red light starting and ending time pair is storedInGo directly to step S4.
Otherwise, marking the intersection to have repeated release flow direction, determining all red light starting and ending time pairs in the public cycle, namely the number of passing times N in the public cycle of forward and reverse coordination directions, and simultaneously respectively storing the red light center time in each group of red light time period
And goes to step S4; in general, at intersections released repeatedly in double periods, large and small periods and in coordination directions, coordination direction repetition conditions exist, that is, the number of passing times N in a public period is more than or equal to 2.
And S4, respectively solving the road direction mode based on the number N of the passes in the public period of the forward and reverse coordination directions determined in the previous step, and determining parameter indexes of each signal control road junction related to signal timing under different conditions that the green light time length of a certain section in the public period is set as a coordination phase.
Specifically, forward and reverse red light time rate delta of the intersection under each condition is solved based on the number of passing times N in the common cycle of the forward and reverse coordination directionsinAnd the time rate delta from the center time of the forward red light to its approximate center time of the reverse red lightin：
When the number of passing times N in the public period is more than or equal to 2, the green light time of a certain section in the public period is set as a coordination phase, and other green light times are set as red light times for solving, namely:
in the formula,. DELTA.inThe time rate of red light under the nth condition of the i intersection comprises the time rate of forward red light
And reverse red light time rate
The red light duration in the i-intersection common period C determined based on the step of S3; c is the duration of the public period; deltainThe time rate of the forward and reverse red light center time under the nth condition of the i intersection is obtained;
the center time of the forward red light under the nth condition of the i intersection;
the center time of the similar reverse red light under the nth condition of the i intersection.
Further aiming at the intersection under multiple conditions, an intersection condition parameter index table is established, and the table content comprises: crossing number, coordination direction, situation serial number, forward and reverse directions, public cycle duration, coordination time segment, forward red light time rate, reverse red light time rate, and forward and reverse red light center time rate.
If a certain intersection A of the coordinated trunk lines is in a common cycle of 100s, the coordination direction is the south-north straight line, the south straight line is the forward direction, and the repeated passing condition exists, the phase phases are as follows:
| straight-going north-south | Left turn from north to south | South passage | East-west straight going | East-west left turn |
| 25 | 15 | 15 | 16 | 12 |
Wherein two release stages exist in the south straight line, namely [0,25], [46,61], and the two release stages are respectively used as coordination stages to solve, and the obtained intersection condition parameter index table is as follows:
and S5, circularly solving the optimal solution of the bandwidth and the phase difference between the intersections based on the public period coordination passing times, namely the optimal trunk line coordination scheme.
S51, solving forward and reverse travel time according to the set forward and reverse speed, namely:
in the formula, LiIs the distance from intersection i to the next intersection, viFor forward and reverse vehicle speeds, TiIs the forward and reverse travel time.
And S52, inputting the forward and reverse forming time of the step S51 and the parameter value solved in the step S4 into a trunk line coordination model, and circularly solving the bandwidth and the phase difference between intersections, wherein the circulating times are the passing times N in the common period of the forward and reverse coordination directions. In general, alternative trunk coordination models include MAXBAND and MULTIBAND.
And S53, summarizing solutions with a certain section of green light time in a public period as a coordination phase, ranking the inter-intersection bandwidth and the phase difference with the maximum objective function, and selecting the optimal solution as a trunk coordination scheme.
Aiming at intersections with repeated coordination release stages in a common period, the trunk coordination optimization method innovatively provides a concept of pairing the coordination release time and the red light starting and ending time in the common period, one section of the concept is used as a coordination phase stage, the red light time rate and the time rate from the forward red light center time to the similar reverse red light center time are solved, the red light time rate and the time rate are used as parameters and are substituted into a trunk coordination model, and a trunk coordination scheme is obtained through cyclic solution.
The trunk line coordination optimization method for repeatedly releasing in the coordination direction puts forward that the maximum/minimum green light time length of each phase stage in a crossing signal scheme is used as a limiting condition, and if conflicts exist in the time lengths of each phase stage in the signal scheme optimized according to the configured cycle time length, the maximum/minimum green light time length is taken as the main time length, so that the rationality of trunk line coordination configuration is improved.
Claims (9)
1. A trunk line coordination optimization method for coordinating repeated release in direction is characterized in that: drawing a time distance graph on the basis of acquiring an intersection signal control scheme, identifying repeated passing conditions in an intersection common period, respectively solving each condition based on a trunk line coordination model, and finally comparing to obtain a trunk line coordination optimal scheme; comprises the following steps of (a) carrying out,
s1, a traffic signal control system is docked, basic information and a signal control scheme of the intersections are collected, and a coordination trunk line and the coordination direction of each intersection are determined;
s2, determining a common period and the period duration of each intersection based on the signal control scheme of each intersection of the coordinated trunk line, and optimizing the signal control timing scheme of each coordinated intersection;
s3, identifying repeated passing of the road junction coordination direction based on drawing of the coordination trunk line time distance graph, and determining the passing times N of the coordination direction in the trunk line positive direction public period; in step S3, specifically, the step,
s31, summarizing the signal control schemes after the optimization adjustment of each trunk line at the intersection, drawing a time distance graph by taking the common period C as the period time length, the phase stage of the coordinated direction as the green light time length and the phase stage of the uncoordinated direction as the red light time length, thereby determining the red light time length T in the common period C of the forward and reverse directionsredRed light time period [ TOpening device，TKnot]And the red light time t in the red light time periodred(ii) a Wherein, the red light period [ T ]Opening device，TKnot]Refers to the time from the start of the red light to the arrival of the most recent phase-coordinated direction phase within the common period, where TOpening deviceAt the start of a red light, TKnotIs the starting time of the green light, and the red light time length t in the red light time periodred＝TOpening device-TKnot；
S32, comparing the red light time length t in the red light time periodredWith the duration T of the red light in the common period CredDetermining the passing times N in the common period of the forward and reverse coordination directions;
s4, solving parameter indexes related to signal timing of each signal control intersection under the condition that the green light duration of a certain section in the public period is set as the coordination phase respectively based on the passing times N in the public period of the forward and reverse coordination direction determined in the step S3;
and S5, circularly solving the optimal solution of the bandwidth and the phase difference between the intersections based on the public period coordination passing times, namely the optimal trunk line coordination scheme.
2. The trunk coordination optimization method for coordinating repeated release of directions according to claim 1, wherein: in step S2, specifically, the step,
s21, integrating the signal control schemes of each coordinated intersection to determine the cycle duration of each intersection, specifically, determining the common cycle duration C, and determining the cycle duration C of the existing intersection signal control schemeiCompared with the common period C, determining the intersection which can be configured to be double periods or big periods and the period duration C'i；
And S22, optimizing the configuration scheme of each intersection based on the maximum green light duration/the minimum green time duration of the phase stage in the signal control scheme in the step S1 and the period duration obtained in the step S21.
3. The trunk coordination optimization method for coordinating repeated release of directions according to claim 2, wherein: in step S22, specifically, the step,
s221, optimizing the adjusted intersection period c 'according to the step S21'iPeriod c of crossing with originaliPhase green time ratio alpha ofiThe green light time length g 'of the phase stage is obtained through proportion adjustment'ij；
S222, controlling the maximum green light time length of each phase stage based on the signal
And minimum green light duration
Phase stage green light duration g 'obtained by solving step S221'ijAnd (6) adjusting.
4. The trunk coordination optimization method for repeatedly passing through coordination directions according to claim 3, wherein: in step S221, the green duration of each phase stage is:
g′ij＝αi*gij
in formula (II), g'ijThe adjusted green light duration g of j phase stage at i intersectionijFor the initial green duration, alpha, of the j phase stage at the i intersectioniIs green time proportion of phase at intersection i'iFor adjusted cycle duration, ciIs the initial cycle duration; meanwhile, if the intersection traffic signal control scheme has a locked phase, the phase green-time ratio value alphaiGreen light time length g of needing to eliminate locking phase during solvingI lockNamely:
5. the trunk coordination optimization method for repeatedly passing through coordination directions according to claim 3, wherein: in the step S222, specifically,
s2221, if the adjusted green duration of the phase stage is optimized
The green time of the j phase at the i intersection is reduced to the maximum green time
Reduced green light duration by green time ratio betaijThe phase of the phase-unadjusted stage is expanded to within the period, namely the green light duration of the intersections except the coordination intersection on the coordination trunk line is as follows:
in the formula, betaijThe green time proportion of j phase stage at i intersection; gijThe initial green light duration of the j phase stage of the i intersection; c. CiIs the initial cycle duration; (g'ij) The green light duration of j stages in the cycle range of the i intersection after the locking phase is removed; meanwhile, if all the phase stages are greater than the maximum green light time, the intersection period time length is adjusted to be a public period;
s2222, if the green duration of the crossing phase stage is optimized and adjusted
The green time of j phase at i intersection is extended to the minimum green time
Increased green light duration by green time proportion betaijReducing the phases except the coordination phase in the period range, and meanwhile, if all the optimized phases are smaller than the minimum green light time, adjusting the period time of the intersection into a public period;
s2223, if the green duration of the crossing phase is adjusted preferentially
The flow goes directly to step S3 without adjustment.
6. The trunk coordination optimization method for coordination direction repeat release according to any one of claims 1 to 5, characterized in that: in step S32, specifically, the step,
if the forward and reverse red light periods are equal to the red light duration in the common cycle C, i.e. tred＝TredIf the intersection is in the normal direction, the intersection can only pass once in no period, the passing frequency N is 1, and the red light center time T of the red light starting and ending time pair is storedInGo directly to step S4;
otherwise, marking the intersection with repeated release flow direction, and determining the start and end of all red lights in the common periodChecking, i.e. the number of passing times N in the common cycle of the forward and reverse coordination directions, and simultaneously respectively storing the red light center time in each group of red light time periods
And proceeds to step S4.
7. The trunk coordination optimization method for coordination direction repeat release according to any one of claims 1 to 5, characterized in that: step S4 is specifically to find out the forward and reverse red light time rate delta of the intersection under each condition based on the number of times N of passing in the common cycle of the forward and reverse coordination directioninAnd the time rate delta from the center time of the forward red light to its approximate center time of the reverse red lightin(ii) a When the number of passing times N in the public period is more than or equal to 2, the green light time of a certain section in the public period is set as a coordination phase, and other green light times are set as red light times for solving, namely:
in the formula,. DELTA.inThe time rate of red light under the nth condition of the i intersection comprises the time rate of forward red light
And reverse red light time rate
The red light time length in the i-intersection common period C determined based on step S3; c is the duration of the public period; deltainThe time rate of the forward and reverse red light center time under the nth condition of the i intersection is obtained;
is positive red in the nth case of the i-junctionLamp center time;
the center time of the similar reverse red light under the nth condition of the i intersection.
8. The trunk coordination optimization method for coordination direction repeat release according to any one of claims 1 to 5, characterized in that: in step S4, for the intersection where the number of passes N in the public period is greater than or equal to 2, the green light duration of a certain segment in the public period is set as the coordination phase condition, and an intersection condition parameter index table is established, including the intersection number, the coordination direction, the condition number, the forward and reverse directions, the public period duration, the coordination time segment, the forward red light time rate, the reverse red light time rate, and the forward and reverse red light center time rate.
9. The trunk coordination optimization method for coordination direction repeat release according to any one of claims 1 to 5, characterized in that: in step S5, specifically, the step,
s51, solving forward and reverse travel time according to the set forward and reverse speed, namely:
in the formula, LiIs the distance from intersection i to the next intersection, viFor forward and reverse vehicle speeds, TiIs the forward and reverse travel time;
s52, inputting the forward and reverse forming time of the step S51 and the parameter value solved in the step S4 into a trunk line coordination model, and circularly solving the bandwidth and the phase difference between intersections, wherein the circulating times are the passing times N in the common period of the forward and reverse coordination directions;
s53, solutions with the green light time length of a certain section in each public period as a coordination phase are summarized, the inter-intersection bandwidth and the phase difference with the maximum objective function are ranked, and the optimal solution is selected as a trunk coordination scheme.
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| CN113205695B (en) * | 2021-04-13 | 2022-02-18 | 东南大学 | Multi-period length bidirectional trunk line green wave control method |
| CN114613164B (en) * | 2022-02-21 | 2023-06-06 | 华南理工大学 | Arterial road green wave coordination design method facing dual-period control requirement |
| CN114267187B (en) * | 2022-02-28 | 2022-07-12 | 深圳市城市交通规划设计研究中心股份有限公司 | Signal lamp control method and device, computer equipment and storage medium |
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