Research On Perimeter Control And Guidance Collaboration Method Based On MFD

With the development of urbanization and motorization,traffic congestion has become a thorny problem for many cities.In macro traffic network,although many complex algorithms have been applied to solve the problem of road network traffic control,due to the difficulty for obtaining accurate OD data,making it difficult to apply those methods in real-time control environment.However,the Macroscopic Fundamental Diagram(MFD)of road network can avoid this problem,and the existence is proved providing an opportunity for the popularization and application in the field of traffic control.The traditional results showed that traffic guidance and signal control were two effective means to solve traffic congestion.Supported by the National Natural Science Foundation of china " Study on the feature extraction and fast evacuation algorithm of congestion network based on spatio temporal detection(No.61304195)" and Anhui Provincial Natural Science Foundation of China "study on the mechanism of space situation transition and the rapid evacuation of traffic congestion network(No.1408085QF111)",this paper proposes a cooperative method of traffic guidance and perimeter control based on MFD to solve the problem of traffic congestion of large network which are verified by case analysis.The main contents of this paper are as follows:(1)According to the factor “traffic density” that affects the MFD curve,the macro road network is divided into MFD sub-regions.Moreover,according to the relationship between the adjacency relation among multiple MFD sub-regions and the inflow and outflow rate,the equilibrium equation of road network is established;(2)Based on the spatial and temporal data,this paper analyzes the road nodes and road congestion,and establishes the bottleneck identification and classification model of urban traffic network.Then,according to the relationship between key road network congestion and the MFD curve of sub-region,this paper makes a decision on the timing of traffic guidance and perimeter control;(3)According to the driver's route selection method,the logistic model of driver's route compliance rate is established by SP investigation,and the traffic guidance method of MFD sub-region is put forward;Using the perimeter signal control intersection as the control object,a perimeter control method is proposed to adjust the spilt of signalized intersections.Then obtain cooperative method of traffic guidance and perimeter control for multiple MFD sub-region.Eventually,a multi-objective perimeter coordination optimization model is established,which is based on the maximum flow rate,the average travel time and the average delay,and the adaptive genetic algorithm is used to solve multi-objective function.Taking the road network of the city as an example,the macroscopic road network with MFD is divided into 4-MFD sub-region system.Then,comparing the three methods including the coordination of traffic guidance and perimeter control,the only perimeter control,and the no induction and control.The results show that the macroscopic cooperative method of traffic guidance and control method is more effective than the methods of only using perimeter control or no perimeter control.Moreover,the cooperative method of traffic guidance and perimeter control can better solve the congestion problem of MFD sub-region,and effectively improve the efficiency of macro traffic network.