随机条件下公交优先信号控制方法研究

发布时间：2018-05-21 17:09

本文选题：信号交叉口 + 公交优先　；参考：《兰州交通大学》2016年硕士论文

【摘要】：交叉口是车辆通行的节点,直接关系着交通路网的运行效率。交叉口通过信号指示灯对车辆进行控制,使冲突交通流得到渠化,提高了交通车辆通行的安全性。但是保障安全性的同时也造成了同一相位流向的车辆按一定的时间进行周期的停止与运动,引起了车辆的延误。因而,进行城市信号控制方法的探索,有助于降低车辆延误,优化道路通行效率。现阶段,着力进行城市公共交通进一步发展以及道路信号的优化设置,成为解决城市交通拥堵现象的合理方法。然而,我国绝大多数城市的公共交通对其城市的交通承担量较小,道路信号交叉口控制方法的实际运用程度不高,这些都影响了公交车量的数量及运行时间。因此,探求更合理的公交优先信号配时方法,对于提高公交车运行速度,保障交叉口通行能力,发挥公共交通对城市交通状况的整体提高作用有着很重要的现实意义。本文在已有公交优先信号控制研究的基础上,对单点交叉口公交优先信号控制问题进行了研究,针对城市交叉口建立了优化控制模型,并求解了信号控制参数,最后对信号交叉口进行微观仿真,验证模型求解结果。主要内容如下:1.通过交通调查,以兰州市某些路口为对象,根据对应公交线路数量情况,对交叉口交通数据进行抽样统计,并对获得的样本进行研究,以此获知单个交叉口公交车延误时间的随机特性,得到延误时间的随机分布函数。2.为了弥补已有信号配时方法的不足,根据公交车随机特性结合社会车辆随机分布特征,考虑有公交专用车道条件下的交通流运行特征,建立了以交叉口周期人均延误为控制目标的信号配时模型,并设计了模型求解算法,提高了交叉口通行效率。3.借助MATLAB对已建立的模型进行求解,并用VISSIM软件对文中提出的模型的求解结果进行验证,以延误为基准设立评价指标,通过对定时控制方式下的传统信号控制方案与本文信号控制方案进行对比分析,验证了所设立的参数优化方案的可行性与准确性,为公交优先信号控制提供了一个优化方法。
[Abstract]:Intersection is the node of vehicle, which is directly related to the efficiency of traffic network. The traffic is controlled by signal indicator at intersections, which makes the conflict traffic flow sealer and improves the safety of traffic vehicles. But at the same time, it also causes the vehicle with the same phase flow to stop and move in a certain period of time, which causes the delay of the vehicle. Therefore, the exploration of urban signal control method is helpful to reduce vehicle delay and optimize road traffic efficiency. At present, it is a reasonable method to solve the problem of urban traffic congestion by making further development of urban public transport and optimizing the setting of road signals. However, the public traffic of most cities in our country bears little on the traffic of their cities, and the actual application degree of the road signal intersection control method is not high, all of these influence the quantity of buses and the running time. Therefore, it is of great practical significance to explore a more reasonable method of bus priority signal timing for improving the speed of bus operation, ensuring the traffic capacity at intersections and giving full play to the public transport to improve the overall traffic situation of the city. Based on the existing research on bus priority signal control, this paper studies the problem of bus priority signal control at single intersection, establishes the optimal control model for urban intersection, and solves the signal control parameters. Finally, micro simulation of signalized intersection is carried out to verify the solution of the model. The main content is as follows: 1. Through traffic investigation, taking some intersections in Lanzhou city as the object, according to the quantity of corresponding bus lines, the traffic data of intersection are sampled and statistics, and the samples obtained are studied. The random characteristic of bus delay time at a single intersection is obtained, and the random distribution function of delay time is obtained. 2. In order to make up for the deficiency of the existing signal timing methods, according to the random characteristics of buses and the random distribution characteristics of social vehicles, the traffic flow characteristics under the condition of special bus lanes are considered. In this paper, a signal timing model with the average delay of intersections period as the control target is established, and an algorithm for solving the model is designed to improve the traffic efficiency of intersection. The established model is solved by MATLAB, and the solution results of the proposed model are verified by VISSIM software, and the evaluation index is established based on delay. By comparing and analyzing the traditional signal control scheme under the timing control mode and the signal control scheme in this paper, the feasibility and accuracy of the parameter optimization scheme are verified, which provides an optimization method for the bus priority signal control.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U491.54

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