CN-121982911-A - Traffic signal control method based on generalized TUC and maximum voltage strategy of cv data

CN121982911ACN 121982911 ACN121982911 ACN 121982911ACN-121982911-A

Abstract

The invention discloses a traffic signal control method based on a generalized TUC and maximum pressure strategy of cv data, which takes a 'groined' -shaped road network as a control area to periodically execute traffic signal control, adopts the maximum pressure strategy to control all intersections in the control area in a first period, firstly determines supersaturated intersections based on video data acquired in a previous period of cv equipment respectively arranged at each inlet of each intersection in the control area from a second period, and determines associated intersections thereof, then adopts the associated intersections of all supersaturated intersections in the current period, adopts the TUC strategy to control traffic signals of all supersaturated intersections and the associated intersections thereof, and maintains the maximum pressure strategy to control traffic signals of other intersections.

Inventors

LI PEIQI
HUANG ZHENGFENG
ZHENG PENGJUN

Assignees

宁波大学

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (8)

1. A traffic signal control method based on a generalization TUC and a maximum pressure strategy of cv data is characterized by taking a preset 'groined' road network as a control area and periodically executing traffic signal control, and specifically comprises the steps of adopting the maximum pressure strategy to conduct traffic signal control on all intersections in the control area in a first period, firstly judging whether all intersections are in a supersaturated state in the current period based on video data collected in a period before cv equipment respectively arranged at inlets of all intersections in the control area in a second period, then determining relevant intersections of each intersection in the supersaturated state in the current period based on a road network topological relation and a preset screening rule, adopting the relevant intersections of all supersaturated intersections in the current period to form an intersection set of the current period, adopting the TUC strategy to conduct traffic signal control on all intersections in the intersection set in the current period, and maintaining the maximum pressure strategy to conduct traffic signal control on other intersections in the control area.
2. The traffic signal control method based on the generalized TUC and maximum voltage strategy of cv data according to claim 1, wherein the specific mode of judging whether each intersection is in a supersaturated state in the current period is to determine each type of steering flow of each inlet of each intersection according to the video data, calculate to obtain the traffic capacity of each steering of each inlet of each intersection, and judge that each intersection is in a supersaturated state in the current period if the steering flow of any steering of each inlet of a certain intersection is greater than the traffic capacity.
3. The traffic signal control method based on the generalized TUC and the maximum pressure strategy of cv data according to claim 2, wherein the specific process of determining various steering flows of an entrance of an intersection according to the video data is to count the number of left-turn vehicles, the number of straight-run vehicles and the number of right-turn vehicles in the video data, convert the number of left-turn vehicles into the left-turn flow of the current period of the entrance of the intersection according to unit hour, convert the number of right-turn vehicles into the right-turn flow of the current period of the entrance of the intersection according to unit hour, convert the number of straight-run vehicles into the straight-run flow of the current period of the entrance of the intersection according to unit hour, and convert the number of straight-run vehicles into the straight-run flow of the current period of the entrance of the intersection according to unit hour.
4. The traffic signal control method based on the generalized TUC and maximum pressure strategy of cv data according to claim 3, wherein the traffic capacity of a certain entrance of a certain intersection for a certain turn is determined according to the number of lanes of the turn, the traffic saturation flow, the effective green time of the intersection, and the signal period.
5. The traffic signal control method based on the generalized TUC and maximum pressure strategy of cv data according to claim 4, wherein the specific process of calculating the traffic capacity of a certain entrance and a certain turn at a certain intersection is as follows: Counting the total number of lanes of the entrance turning j of the intersection i, namely Q ij , namely j=1, 2 and 3, and referring to the number of lanes of the entrance turning j of the intersection i as 1 to Q ij , referring to the number of the lanes of the entrance turning j of the intersection i as the Q-th lane of the entrance turning j of the intersection i, referring to the width of the lanes as theta ijq , namely m, the saturation flow as S ijq , and referring to S ijq =900 per hour if theta ijq is less than or equal to 3.5m, and S ijq =1200 per hour if theta ijq is greater than 3.5 m; step A2, calculating to obtain the traffic capacity C ij of the steering j of the entrance of the intersection i by adopting a formula (1), wherein the unit is that vehicles are per hour: (1) Where L i is the signal period of the intersection i in seconds, g ij is the effective green time of the intersection i for the entrance turn j in seconds.
6. The traffic signal control method based on the generalized TUC and the maximum voltage strategy of cv data according to claim 1, wherein for each intersection in which the current period is in a supersaturated state, the specific mode of determining the associated intersection is that firstly, an adjacent matrix of the supersaturated intersection in the current period is constructed based on the road network topological relation, and then the adjacent matrix is combined, and the associated intersection of the supersaturated intersection in the current period is determined according to a preset path length threshold value and an associated intensity threshold value.
7. The traffic signal control method based on the generalized TUC and maximum voltage policy of cv data according to claim 6, wherein the specific manner of constructing the adjacency matrix of the oversaturated intersection of the current period based on the road network topology relationship is as follows: Step B1, counting the number and the direction of all intersections in the control area, and nodizing all the intersections in the control area, wherein each intersection is represented by one node, every two adjacent nodes are connected by a double-directional arrow formed by two opposite unidirectional arrows, and the double-directional arrow represents a double-directional road section connected with the two adjacent intersections to obtain an original road network of the control area; Step B2, setting effective road section rules in two adjacent intersections, namely respectively called a first intersection and a second intersection, wherein if the topological distance from the first intersection to the oversaturated intersection is greater than that from the second intersection to the oversaturated intersection, the road section in the direction from the first intersection to the second intersection is an effective road section, otherwise, the road section is an ineffective road section; Step B3, retaining unidirectional arrows of all effective road sections in the original road network, and deleting unidirectional arrows of all ineffective road sections to obtain an effective road network; Step B4, marking the total number of all intersections in the control area as Y, randomly numbering the Y intersections according to 1 to Y, and calling the intersection with the number Y as a Y-th intersection, wherein y=1, 2, & gt, Y; and B5, constructing an adjacent matrix M of the supersaturated intersection in the current period based on the effective road network, wherein the expression of M is shown in a formula (2): (2) In the formula (2), M tr is an element of the t th row and the r th column in the adjacency matrix M, t=1, 2..y, r=1, 2..y, M tr represents a positional relationship between the t th intersection and the r th intersection, if the t th intersection is an adjacent intersection of the r th intersection and a unidirectional arrow points from the t th intersection to the r th intersection, M tr =1, otherwise, M tr =0.
8. The traffic signal control method based on the generalized TUC and maximum voltage policy of cv data according to claim 7, wherein the specific process of determining an associated intersection of a supersaturated intersection according to a preset path length threshold and an associated intensity threshold is: step C1, marking a path length threshold as u, marking an association strength threshold as v, wherein u is an integer which is more than or equal to 1 and less than or equal to 10, and v is more than or equal to 0 and less than or equal to 1; Step C2, constructing u intermediate matrices, and recording a kth intermediate matrix as Mk, k=1, 2, & gt, wherein the expression of the kth intermediate matrix Mk is shown as a formula (3): (3) in the formula (3), mk tr is an element of the t th row and the r th column in the kth intermediate matrix Mk; step C3, constructing a relevance matrix P, wherein the relevance matrix P is expressed as shown in a formula (4): (4) In the formula (4), P tr is an element of the t th row and the r th column in the association matrix P, and P tr is calculated by adopting the formula (5): (5) in the formula (5), max (Mk) represents the maximum value of all elements in the kth intermediate matrix Mk; And C4, marking the number of the supersaturated intersection as W, W E [1, Y ], respectively judging whether the Y-1 elements except P WW in the W-th column of the association degree matrix P are larger than an association strength threshold v, if so, the intersection with the number equal to the number of lines where the element is positioned is the association intersection of the W-th intersection, otherwise, the intersection is not the association intersection of the W-th intersection.

Description

Traffic signal control method based on generalized TUC and maximum voltage strategy of cv data Technical Field The invention relates to a traffic signal control method, in particular to a traffic signal control method based on a generalized TUC and maximum voltage strategy of cv data. Background Along with the acceleration of the urban process in China, the urban road density is larger and larger, the distance between adjacent intersections is smaller and the road network is more complex. Under the background, the urban road intersection is used as a core key node for urban road traffic operation, and the management organization efficiency of the urban road intersection determines the operation condition of the urban road network to a great extent. How to control by reasonable traffic signals, the running efficiency and the traffic capacity of a traffic system are improved, the congestion phenomenon of a road network is relieved, and the total travel time of pedestrians and vehicles is reduced, so that the traffic system becomes an important problem of current urban traffic management. At present, in the urban area road network layout of China, many roads are crisscrossed vertically and horizontally to form a grid-like road network, which is also called as a 'well' -shaped road network, and the road network layout rules are suitable for developing regional coordination control. Most of the existing 'well' -shaped road networks adopt a single intersection timing control method, the period of the existing 'well' -shaped road networks is fixed, historical flow data is relied on, the signal duration is difficult to dynamically adjust according to real-time traffic, the efficiency reaches the upper limit, and the existing 'well' -shaped road networks cannot adapt to increasingly variable urban traffic complex environments. Therefore, various Traffic signal Control methods such as TUC (Traffic-Responsive Urban Control) and maximum Pressure Control (Max-Pressure Control) are proposed in the academy, wherein TUC is an urban area self-adaptive signal Control method developed by Diakaki, papageorgiou and the like, the queuing length and the running time of the whole area are minimized by uniformly adjusting the green time of each intersection in a road network, the Traffic signal Control method has higher Control performance under supersaturated Traffic conditions, but has slower calculation speed and poorer Control instantaneity, and the maximum Pressure Control is a Traffic signal Control method developed by Varaiya, and the core idea is to always give priority to the green light to the direction with the maximum Pressure, realize self-adaptive optimal Control on the complex road network by using simple rules, and have higher calculation speed and stronger Control instantaneity, but has limited Control performance and low Control accuracy under supersaturated Traffic conditions. Disclosure of Invention The invention aims to solve the technical problem of providing a traffic signal control method based on a generalized TUC and maximum pressure strategy of cv data, which has the advantages of high calculation speed, strong real-time performance, high control performance and high control precision under supersaturated traffic conditions. The technical scheme includes that a traffic signal control method based on a generalized TUC and maximum pressure strategy of cv data is adopted, a preset 'groined' road network is used as a control area, traffic signal control is periodically carried out, specifically, in a first period, traffic signal control is carried out on all intersections in the control area by adopting the maximum pressure strategy, from a second period, whether all intersections in the control area are in a supersaturated state or not is judged based on video data collected by a previous period of cv (video shooting) equipment respectively arranged at each entrance of each intersection in the control area, then, for each intersection in the supersaturated state in the current period, namely, each supersaturated intersection is determined based on a road network topological relation and a preset screening rule, then, all the associated intersections of the supersaturated intersections in the current period are formed into an intersection set requiring TUC coordination control, in the current period, traffic signal control is carried out on all the intersections in the intersection set by adopting the C strategy, and the traffic signal control strategy is maintained in the control area for the rest intersections. The method has the advantages that the maximum pressure strategy with smaller calculation amount is uniformly adopted for the full control area in the first period through the mixed control strategy of stages and areas, the supersaturated intersections are identified based on video data collected by the cv equipment in the previous period from the second period, and the associated intersections are d