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Research On The Foundational Theory And Key Techniques Of Coordinate Signal Control In Urban Traffic Network

Posted on:2011-10-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:K LuFull Text:PDF
GTID:1102360308963662Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
Under the influence of increasing traffic volume and density of road network, correlation among intersections has become increasingly evident. How to design traffic signal coordinated control efficiently from a system point of view, has become a new requirement for the development of traffic control. Considering the defects in existing theory and method of traffic signal coordinated control, combining with development needs and technical characteristics in modern urban traffic control, this dissertation has researched and discussed in the following areas, including dynamic division theory of traffic control subareas, green wave coordinated control models, stop and delay coordinated control models, and implementation of key technologies in traffic signal coordinated control. The main scientific research and research results in this dissertation include:1. Analyzing the influences of distance and traffic volume between neighboring intersections, and signal timing parameters of connected intersections, neighboring intersection correlation degree, as a new traffic parameter, is put forward to quantitatively describe the degree of correlation between two neighboring intersections. The corresponding calculation method and scientific rationality are proposed. Then, the definition and calculation formula of multi-intersection combinatorial correlation degree are presented. The intersection correlation degree realizes an effective integration of influencing factors. After that, by translating division scheme into corresponding character solution, setting constraint conditions and evaluation criteria of division scheme, a division model of traffic control subareas based on the theory of correlation degree is established. The whole division process which is used to get the optimal scheme is proposed. Under this condition, the subarea division schemes are analyzed and evaluated with the layer diffusion algorithm. An example is presented to test and verify the division method of traffic control subareas based on the theory of correlation degree.2. First of all, the algebraic method of bidirectional green wave coordinated control for symmetry phase design has been improved. The value range of ideal intersection distance is determined by allowable value range of common signal cycle, a new calculation method for green wave bandwidth based on bias-split is presented, and a new selection rule of minimizing the maximum bias-split for optimal ideal intersection distance is established. Then, an algebraic method of bidirectional green wave is presented which can be used for arterial road coordinate control in the signal design mode of one-phase-one-approach. This method can optimize common signal cycle, phase sequence of each intersection, and signal offsets. Analysis in theory and applications have demonstrated that the character of application scope and effectiveness of the method. Finally, a general coordinated control model of bidirectional green wave for different traffic released mode is proposed. Signal timing optimization process based on the control model is designed. The control model can be solved by the method of mixed-integer linear programming, and a general object function of bidirectional green wave coordinated control for different bandwidth needs is established. It is a widely used, practical and accurate method for arterial road coordinate control.3. The effect of upstream intersection signal setting on platoon's stop and delay at downstream intersection has been analyzed. With the different time that platoon reaches downstream intersection and the cumulative arrival-departure diagrams, this dissertation proposes corresponding stop and delay coordinated control models for under-saturated and over-saturated traffic conditions. The functional relationship between platoon's stop and delay and neighboring intersections'offset is obtained. Signal timing optimization process based on the coordinated control model is designed, and the optimization methods for split and offset are also given. Then, uniform stop and delay models for under-saturated and over-saturated traffic conditions are proved to be consistent and accurate by formula derivation and simulation. This dissertation analyses the stop and delay at intersection approach for different control modes and different traffic conditions from uniform and stochastic resistance.4. Initially, the dynamic hierarchical structure, physical architecture, and logical framework for area traffic signal control system are developed by contrast to all existing systems. Hardware components and function modules are described. Besides, database of network real-time information for traffic signal control system is established. The fast dynamic division process of control subareas is proposed. Relationship between intersection correlation degree and coordinated control style is discussed. Basis for the selection of optimal signal timing scheme is presented. A signal timing scheme transition algorithm which can transfer from one scheme to another quickly and smoothly is given. Eventually, take traffic signal coordinated control systems on Liansheng Road, Humen Town, Dongguan City, as an example, signal timing for each intersection, division process for control subareas, and the process to calculate optimal signal timing scheme are introduced. Scientific rationality of the division theory of control subareas and the method of coordinated control are verified by traffic simulation and practice.
Keywords/Search Tags:Intersection Correlation Degree, Control Subarea Division, Green Wave Coordinated Control, Stop and Delay Coordinated Control, Dynamic Hierarchical Control Structure
PDF Full Text Request
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