Abstract

It’s often hard for existing mathematical models to unify and optimize all control variables including phase time, signal phase sequence, offset and signal cycle at the same time. An optimization model for regional green wave coordinated control based on Ring-and-Barrier structure under unsaturated signalized network is proposed in this study. The constraints of signal timing parameters, such as signal cycle, signal phase sequence and phase time, are explored for the intersections based on Ring-and-Barrier structure. It is proved that the comprehensive optimization of phase time and signal cycle, signal phase sequence and offset can be achieved. And a three-dimensional time-space diagram is innovatively proposed to display the regional green wave coordinated control effect. The coordination effect of the model proposed in this paper is compared with the coordination effect of Synchro via a case study. It demonstrates that the regional signal timing scheme obtained by this model can lead to a better result in all aspects of each intersection, each artery and the whole control area. In the meanwhile, the proportion of bandwidth at each intersection is wider than 79% while satisfying the minimum demand of traffic flow at each intersection. To sum up, this model can improve the overall optimization effect of regional signal coordination control by optimizing the phase time, and achieve the comprehensive optimization of signal cycle, signal phase sequence, offset and phase time.

摘要

现有的数学模型通常很难同时统一和优化所有控制变量，包括相时间，信号相序，偏移和信号周期。提出了一种基于环障结构的非饱和信号网络区域绿波协调控制的优化模型。针对基于环形屏障结构的交叉路口，探索了信号时序参数的约束条件，如信号周期，信号相位序列和相位时间。实践证明，可以实现相位时间和信号周期，信号相位序列和偏移的综合优化。并创新地提出了三维时空图，以显示区域绿波协调控制效果。通过案例研究，将本文提出的模型的协调效果与Synchro的协调效果进行了比较。它表明，通过该模型获得的区域信号定时方案可以在每个交叉点，每个动脉和整个控制区域的各个方面带来更好的结果。同时，每个交叉口的带宽比例均大于79％，同时满足了每个交叉口的最小流量需求。综上所述，该模型可以通过优化相位时间来提高区域信号协调控制的整体优化效果，实现信号周期，信号相位序列，偏移和相位时间的综合优化。它表明，通过该模型获得的区域信号定时方案可以在每个交叉点，每个动脉和整个控制区域的各个方面带来更好的结果。同时，每个交叉口的带宽比例均大于79％，同时满足了每个交叉口的最小流量需求。综上所述，该模型可以通过优化相位时间来提高区域信号协调控制的整体优化效果，实现信号周期，信号相位序列，偏移和相位时间的综合优化。它表明，通过该模型获得的区域信号定时方案可以在每个交叉点，每个动脉和整个控制区域的各个方面带来更好的结果。同时，每个交叉口的带宽比例均大于79％，同时满足了每个交叉口的最小流量需求。综上所述，该模型可以通过优化相位时间来提高区域信号协调控制的整体优化效果，实现信号周期，信号相位序列，偏移和相位时间的综合优化。