过饱和状态下的单交叉口最小延误信号周期模型
Signal cycle model for minimum delay at oversaturated isolated intersection
摘要点击 1042  全文点击 736  投稿时间:2014-02-23  修订日期:2015-01-13
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DOI编号  10.7641/CTA.2015.40127
  2015,32(4):521-526
中文关键词  交通控制  过饱和  定数理论  信号周期  延误时间  单交叉口
英文关键词  traffic control  oversaturation  deterministic theory  signal cycle  delay  isolated intersection
基金项目  国家自然科学基金项目(61203164, 61174184), 广东省自然科学基金项目(S2012040007998), 广州市珠江科技新星专项(2013J2200066), 广东高校优秀青年创新人才培养计划项目(2012LYM_0014), 同济大学道路与交通工程教育部重点实验室开放基金项目(K201304)资助.
学科分类代码  
作者单位E-mail
徐建闽 华南理工大学 土木与交通学院
华南理工大学 自主系统与网络控制教育部重点实验室 
 
荆彬彬 华南理工大学 土木与交通学院 jingbin19@126.com 
卢凯 华南理工大学 土木与交通学院
华南理工大学 自主系统与网络控制教育部重点实验室 
 
中文摘要
      由于现有单交叉口信号配时方法主要适用于低饱和交通状态, 本文以过饱和交通状态作为研究对象, 利用定数理论分析了信号交叉口进口道的车辆到达与驶离规律, 建立了信号周期与延误时间之间的数学模型, 推导了单交叉口最小延误的信号周期计算公式. 以某个四相位交叉口为例, 针对3组不同流量比的过饱和交通状态, 分别获取了延误时间与信号周期之间的变化曲线, 计算了最小延误所对应的最佳信号周期, 并利用VISSIM微观交通仿真软件, 仿真得到了3组不同流量比情况下的延误时间. 仿真结果表明: 在各组流量比设置下, 延误时间的理论计算值与仿真实验值相一致, 有效验证了该模型的准确合理性, 为解决过饱和状态下的交叉口信号配时优化问题提供了理论指导依据.
英文摘要
      The existing signal timing methods for isolated intersection are mainly suitable for low saturation traffic state. Taking oversaturated traffic state as the research object, we develop a mathematical model between the signal cycle and the delay by analyzing the arrival-departure rule of vehicles at signalized intersection entrance with the deterministic theory. Then, the signal cycle formula at isolated intersection is deduced for minimal delay. Taking a four-phase intersection for example, we plot the changing curves between the signal cycle and delay; and the optimal signal cycles are found respectively for the three oversaturated traffic conditions that have different flow ratios. Finally, the delay under each traffic flow ratios was obtained by using VISSIM micro-simulation software. The simulated result shows that the delay from theoretical calculation coincides well with that of simulation under different flow ratios, validating the accuracy and rationality of the model. This provides a theoretical basis for solving signal timing problem at oversaturated intersection.