CN104616507A - Coordination control method and system for signal period of traffic sub-area - Google Patents
Coordination control method and system for signal period of traffic sub-area Download PDFInfo
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Abstract
The invention provides a coordination control method and a system for signal periods of a traffic sub-area, wherein the system and the method are used for carrying out node importance sequencing on intersections in the traffic sub-area, finding out the most important node, taking the signal period as a public signal period, and further carrying out signal period calculation on all nodes in the sub-area according to flow and the existing signal period to form a common period state of all intersections in the whole traffic sub-area, thereby realizing basic coordination control optimization and simultaneously providing a basis for further realizing more optimized coordination control of the traffic sub-area.
Description
Technical Field
The invention relates to the field of urban road traffic signal control, in particular to a method and a system for controlling public signal periods and intersection signal periods of a traffic sub-area.
Background
Traffic signals are one of the main means for realizing road traffic state control, the control methods of single intersections and main roads are mature day by day, but an effective method is still lacked in the aspect of coordination control of a larger-range traffic subarea; the existing public period calculation method lacks consideration on the traffic characteristics of the whole road network; the basic characteristic of the coordination control is the common period, namely, a plurality of intersections adopt the same signal period length; the method for obtaining the public signal period of the traffic subarea and the signal period of each intersection according to the traffic flow monitoring data is not solved in the world.
Disclosure of Invention
The invention provides a method and a system for coordinately controlling public signal periods and node signal periods of traffic sub-areas in order to overcome the defect of the current ubiquitous urban road traffic signal area coordinately controlling method in practical application. The method fully considers the overall traffic characteristics of the traffic subareas on one hand, and considers the characteristic that the traffic conditions of single intersections form a common period on the other hand, thereby realizing the basic coordination control method of the traffic subareas and providing support for more complex coordination control.
The invention specifically adopts the following technical scheme: the system comprises a dynamic road network modeling module, a node importance calculation module and a public signal period and node signal period calculation module; the dynamic road network modeling module is used for establishing a dynamic road network model which takes intersections as points, roads as edges and average travel time as a weight according to road network topological data and real-time dynamic traffic flow data of the traffic subareas; the node importance calculating module is used for establishing a calculating method for evaluating the network performance and further calculating and sequencing the importance of all nodes; and the common signal period and node signal period calculation module is used for obtaining the common signal period according to the node importance sequence and calculating the signal period of each node by traversing all the nodes.
The dynamic network model is described as follows: any one of the urban road traffic networks may be described in the form of:
TN＝(N,E,W),
where TN is the traffic network to be modeled, N ═ N1,n2,…,npThe node is a node set in the traffic network, and p is the number of nodes; e ═ E1,e2,…,eqThe q is a road section set in the traffic network, and the q is the number of roads; w ═ W1,w2,…,wqThe set of edges in the traffic network (q is the number of roads), and the weight w is defined as the travel time on the road segment, which is described as follows:
wherein l is road mileage; s is the average speed of vehicles traveling on the road over a certain period of time, from real-time road traffic monitoring data.
The road network node importance calculation method is described as follows: for the dynamic traffic network at any moment, the network performance is defined as follows:
wherein, p is the node number for the performance of the whole network at a certain time; i. j is two different nodes;ijthe performance value of an edge between two nodes at a certain moment is calculated according to the following formula:
wherein,is the average travel time value under the saturation critical state between two points; omegaijThe shortest travel time value in the road network at a certain time.
The calculation formula of the importance of the network node is as follows:
wherein I (n) is the importance of node n; (TN-n) indicates a network after deleting the node n and the edges adjacent thereto.
The common signal period and node signal period calculation method is described as follows:
the common period is defined asI.e. the signal period of the node of highest importance. By traversing all nodes in the road network and combining node flow and the existing signal period, the intersection period in the traffic subarea is set as
1) Judging the current flow of the intersectionWhether the traffic is more than or equal to the traffic of the intersection with the highest importanceIf yes, maintaining the original signal period of the intersectionThe change is not changed; if not, entering step 2);
2) judgment ofWhether or not it is greater than or equal toIf yes, the original signal period of the intersection is determinedConversion to common signal periodsIf not, entering step 3);
3) judgment ofWhether or not it is greater than or equal toAnd is less thanIf so, if the original signal period of the intersection is the same as the original signal period of the intersectionIs greater than or equal toThen the original signal period of the intersection will beIs transformed intoIf the original signal period of the intersection isIs less thanThen the original signal period of the intersection will beIs transformed intoIf not, entering step 4);
4) if the original signal period of the intersection isIs greater than or equal toThen the original signal period of the intersection will beIs transformed intoIf the original signal period of the intersection isIs less thanThen the original signal period of the intersection will beIs transformed into
The invention has the following beneficial effects:
(1) the method has good real-time characteristic and can meet the requirement of adjusting the signal timing of the online network; the real-time road monitoring data is taken as the basis, and the calculability is realized;
(2) the dynamic characteristics of a traffic network are fully considered, and the dynamic network model taking travel time as a side weight can accurately reflect the dynamic characteristics of the traffic network;
(3) the network performance calculation method fully considers the structural characteristics of the whole road network, rather than only considering a single intersection or adjacent intersections;
(4) the network importance calculation can effectively and accurately reflect the influence degree of the intersection on the traffic state of the whole traffic subarea;
(5) the selection of the public period fully considers the traffic characteristics of the whole traffic subarea;
(6) the calculation of the intersection signal period combines the traffic condition of the intersection and meets the requirement of the common period characteristic.
Description of the drawings:
FIG. 1 is a main flow chart of the method of the present invention.
Fig. 2 is a flow chart of node importance calculation.
FIG. 3 is a flow chart of intersection signal cycle calculation.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a public cycle and intersection cycle calculation method for traffic subarea coordination control mainly includes three levels: the system comprises a dynamic traffic network modeling module 103, a road network node importance calculating and sequencing module 102 and a traffic sub-area public signal period and intersection signal period calculating module 101. The three parts have a step-by-step support relationship, namely, the dynamic road network model provides a platform for road network performance calculation and importance calculation, and importance sequencing provides a basis for selecting a public period.
Referring to fig. 2, road network topology data and traffic flow monitoring data 204 provide data support for dynamic road network modeling 203; on the dynamic road network model 203, road network performance calculation 202 at any time is realized; and further realizes intersection importance calculation and sorting 201.
Referring to fig. 3, 301 is to adjust the signal period for a certain intersection in the traffic subarea; 302 is the flow rate of the intersection in a specific time period303 represents the flow of the current intersection in a specific time periodTraffic of intersection with the highest importance304 represents the current intersection trafficIs less than heavyTraffic of intersection with highest importance305 denotes the current intersection trafficTraffic of intersection with highest importance greater than two-thirds306 represents the current intersection trafficIntersection traffic with the highest importance greater than or equal toOne third of (a), less than two thirds of (a), and there are two cases, respectively, of the current intersection signal periodPeriod greater than or equal to intersection with highest importanceTwo thirds, less than two thirds; 307 denotes the current intersection trafficLess than the most important crossingOne third, there are two cases simultaneously, which are the current intersection period respectivelyAt intersections of greater than or equal to the highest importanceOne third, less than one third; 308 denotes the new signal period at the intersectionIs similar to the originalThe same; 309 denotes new signal period of current crossingBy using310 denotes the intersection new signal periodBy usingReference numeral 311 denotes a new signal period at the intersectionBy using312 denotes the intersection New Signal periodBy using313 denotes the intersection New Signal periodBy using314 denotes the resulting new signal period at the intersection315 represents entering the next intersection signal period calculation.
Calculating a public signal period and an intersection signal period of a traffic subarea, traversing each intersection 301, dividing according to intersection flow 302, and when the intersection flow is more than or equal to the intersection flow with the highest importance 303, keeping intersection signal timing unchanged 308; when the flow rate is smaller than 304, further subdividing the flow rate; when the intersection flow is more than or equal to two thirds of the intersection flow with the highest importance 305, selecting a common period 309 in the signal period; when the intersection period is more than or equal to one third and less than two thirds, the relationship 306 between the existing period and the public period is further considered, and the intersection period is set as a public period 310 and a half period 311 respectively; when the intersection flow is less than one third of the intersection flow with the highest importance, the relation 307 of the existing cycle and the public cycle is also considered, and finally the intersection cycle is set to be a three-component cycle and a four-component cycle 313; finally outputting a new intersection signal cycle 314; and proceeds to the next cycle 315.
The public period and intersection signal period calculation of the traffic sub-area is realized by selecting the intersection with the highest importance as the public period and traversing all intersections to calculate the signal period, so that the internal common period characteristic of the traffic sub-area is finally formed, the basic coordination control of the traffic sub-area is realized, and method support is provided for realizing the macroscopic control of the traffic sub-area and the optimization of the traffic state of a road network.
Claims (3)
1. A coordination control method for signal periods of traffic subareas is characterized in that: the method sequentially comprises the following steps:
the method comprises the following steps of (I) carrying out dynamic road network modeling based on real-time road monitoring data, and establishing the following model by taking intersections in a road network as nodes of the network, roads as edges of the network and average travel time as weights of the edges in the network:
TN＝(N,E,W),
where TN is the traffic network to be modeled, N ═ N1,n2,…,npIs a node set in a traffic networkP is the number of nodes; e ═ E1,e2,…,eqThe q is a road section set in the traffic network, and the q is the number of roads; w ═ W1,w2,…,wqThe q is the set of edges in the traffic network and the number of roads; the weight w is defined as the travel time on the link, and is described as follows:
wherein l is road mileage; s is the average speed of a vehicle traveling on the road over a period of time, from real-time road traffic monitoring data;
(II) carrying out importance calculation on the traffic network nodes:
for the dynamic traffic network at any moment, the network performance is defined as follows:
wherein, p is the node number for the performance of the whole network at a certain time; i. j is two different nodes;ijthe performance value of an edge between two nodes at a certain moment is calculated according to the following formula:
wherein,is the average travel time value under the saturation critical state between two points; omegaijThe shortest travel time value in the road network at a certain time is obtained;
the calculation formula of the importance of the network node is as follows:
wherein I (n) is the importance of node n; (TN) represents the overall network performance, (TN-n) represents the network performance after the deletion of node n and its adjacent edges;
and (III) calculating the public signal period and the node signal period of the traffic subarea: determining the signal period of the node with the highest importance of the network nodes as the common signal periodAnd calculating to obtain the signal period of each node by traversing all nodes in the traffic subarea and combining the intersection flow and the existing signal period.
2. The method of claim 1, wherein the method comprises the following steps:
the method for calculating the node signal period in the step (three) specifically comprises the following steps:
1) judging the current flow of the intersectionWhether the traffic is more than or equal to the traffic of the intersection with the highest importanceIf yes, maintaining the original signal period of the intersectionThe change is not changed; if not, entering step 2);
2) judgment ofWhether or not it is greater than or equal toIf yes, the original signal period of the intersection is determinedConversion to common signal periodsIf not, entering step 3);
3) judgment ofWhether or not it is greater than or equal toAnd is less thanIf so, if the original signal period of the intersection is the same as the original signal period of the intersectionIs greater than or equal toThen the original signal period of the intersection will beIs transformed intoIf the original signal period of the intersection isIs less thanThen the original signal period of the intersection will beIs transformed intoIf not, entering step 4);
4) if the original signal period of the intersection isIs greater than or equal toThen the original signal period of the intersection will beIs transformed intoIf the original signal period of the intersection isIs less thanThen will cross the roadPeriod of original signalIs transformed into
3. A system for the coordinated control of traffic subarea signal cycles using the method according to claims 1 and 2, characterized in that: the system comprises a dynamic road network modeling module, a node importance calculation module and a public signal period and node signal period calculation module;
the dynamic road network modeling module is used for establishing a dynamic road network model which takes intersections as points, roads as edges and average travel time as a weight according to road network topological data and real-time dynamic traffic flow data of the traffic subareas;
the node importance calculating module is used for establishing a calculating method for evaluating the network performance and further calculating and sequencing the importance of all nodes;
and the common signal period and node signal period calculation module is used for obtaining the common signal period according to the node importance sequence and calculating the signal period of each node by traversing all the nodes.
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