两相位信号交叉口反馈控制方法研究

Research on signal feedback control method for two-phase intersection

交叉口交通流运行状况很大程度上决定城市道路网是否顺畅。为解决交叉口的拥堵问题,本文以两相位信号控制交叉口为研究对象,建立了不同状态下的车辆排队长度模型,并根据排队长度实测值与期望值之间的偏差,制定了相对应的反馈控制规则。利用Matlab接入Vissim-COM接口来动态访问和操控Vissim对象。通过调节信号周期时长来改变交叉口单位时间吞吐量及排队长度。进行了不同流量状态下的仿真模拟,分析优化前后交叉口的通行性能和运行状态。实验证明,所建立的信号反馈控制模型可较好适应交通流的动态变化,提高交叉口的运行效率。

The operation status of the intersection’s traffic flow largely determines whether the urban road network works well.To solve the problem of congestion at the intersection,the two-phase signal control intersection is used as the research object,and the vehicle queuing length model in different states is established.The deviation between the measured value of the length and the expected value establishes the corresponding feedback control rule.We use Matlab to access the Vissim-COM interface to dynamically access and manipulate Vissim objects,change the unit time throughput and queue length of the intersection by adjusting the signal cycle duration,and then perform simulations under different traffic conditions to analyze and optimize the traffic of the intersection before and after performance and operating status.Experiments show that the established signal feedback control model can better adapt to the dynamic changes of traffic flow and improve the operation efficiency of intersections.