Study On The Theories And Technologies In Large-Scale Traffic Coordinated Control Systems Based On Network Equilibrium

As the expansion of cities, new emergent intersections are constantly added to. The boundary of controlling region is pushed further out. As the characteristics of the traffic flow are closely related to the geographical situation, which under the control of the performance of controller, all intersections could not --and should not -be incorporated into one traffic control system. It is necessary to coordinate each area traffic signal control systems, so as to implement the large-scale network traffic flow control.The volume and speed of the traffic flow on the different segments and intersections are different, which indicate the characteristics of the traffic flow are closely related with space. And the travel have inequable time characteristic, which result in the traffic flow has put the dissimilar rule even if they were in the same position. Therefore, the urban traffic flow has different characteristics of space-time. In order to control them reasonably, it should be carried on a combined action of space and time. The essence of large-scale traffic coordinated control systems are correspond the traffic flow among the different districts by means of traffic signal control and traffic flow guidance, and take a more active role in coordinating network traffic flow among the area in space.This paper is based on complexity network theory, network equilibrium theory and DTA. First, it defined the functions of the large-scale traffic coordinated control systems. On the basis of it, the disadvantages of Area Traffic Control System applied in China are Analysised. And the logical and structural frameworks are built, which emphasized the important role of large-scale coordinated traffic control systems.After described the definition, the characteristic, statistical parameter and the state of complex network, it is concluded that the traffic network is a non-sclaed network. And it demonstrated the resemblance between the communication network and traffic network, by applying two simulation tools: the CA model and NS2. Five resemblances are proposed. Then on the basis of recognizing the complex network, it analyzed the influence of topological structure to the networking dynamics behavior, and proposed Algorithm of Dynamic Management of Node Traffic Flow in Large-scale Traffic Network.To gain the network equilibrium in large-scale traffic coordinated control system is the necessary measure to avoid or mitigate large-scale congestion. Thus, this paper based on the deeply analysis of the network equilibrium theory, by means of traffic signal control and traffic flow guidance, developed the traffic flow dynamic balance methods of large-scale traffic network. By annotationing the theory of DTA again, in order to look for the smallest weight and the most volume traffic flow. The whole procedure can assign the real-time traffic flow in large-scale traffic coordinated control system.In order to solve the problem of collection the traffic volume in the non-detector intersections, this paper developed traffic information prediction technology based on the node relevance in complexity network. Due to the quality of the input data for model effectiveness can not be ignored, in order to satisfy the request of the quality of the input data, time-space data fusion repair method was be proposed. After analysising the principal component analysis, this paper pointed out the disadvantages of it and mended it. In the experimentation, nine intersections were simulated , a lot of experimental data are given birth to. The result proved that there are a great deal of decrease in the number of independent variable and precision of prediction was improved greatly, by inducing the principal component analysis the. That demonstrated the algorithms can ensure the implementing the system.The difficult problem for implementing the large-scale coordinated traffic control systems is how to efficiently solve optimal path of on the large-scale network. Based on DTA, this paper employed itself studying the solve the network equilibrium optimal path algorithm, trying to reduce the computing time, in order to provide technological support to implement the large-scale traffic coordinated control systems.Based on the technologied before-mentioned, the system requirement was analysised. Then the design of system was completed.