流量差异下的环形交叉口信号控制研究

发布时间：2018-03-18 18:03

本文选题：交通工程　切入点：信号控制　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在交通需求较小的情况下,环形交叉口可以使车辆连续顺畅的通过,不仅消除了冲突点而且还提高了行车的安全性。但是近些年来,连续增长的交通流量使单纯的无控制环形交叉口已经不再适用。针对环形交叉口的左转车流二次停车控制方法由同济大学的杨晓光等提出,该方法不仅能扩大环形交叉口的容量瓶颈,使左转车流能在环道空间上二次排队停车,还能提高环形交叉口的通行能力,降低行车延误。但是左转二次控制方法一般采用对称放行的两相位信号控制,实际运用中环形交叉口的各个进口方向流量完全相同的概率较小。当对向两个进口道方向流量存在差异性的情况时,仍使用对称放行的控制方案,会使得同一相位中对向进口方向环形交叉口内部环道利用不均,进口道方向信号相位中的绿灯时间利用率不均。所以,需要在环形交叉口左转二次控制的研究内容中,面向大型环形交叉口在对向存在流量差异情况下的信号控制进行深一步的研究。论文主要通过介绍现存针对于大型环形交叉口左转二次信号控制中的对称放行控制方案,并对其在现实对向存在流量差异性情况下存在着有效绿灯时间利用率不足和环道空间利用有效性缺失的问题进行了分析和总结。为了后续对比分析的方便,对常规的对称放行左转二次信号控制方案的具体适用条件,信号控制方案参数的具体标定过程进行了详细叙述。论文的主要创新之处在于,根据对称方向控制方案中对环道空间利用不足的情况,提出了一种利用剩余环道空间,提前放行高流量进口方向车流的控制方法。并详细分析了该提前放行控制方案的控制策略的具体思路与优化步骤。针对流量差异性在控制方案的实施过程中,对相关进口道的各个相位时间的总体状况进行分析,对相应进口道流量进行修正。最后,结合常规的对称放行左转二次信号控制方案中的对应参数标定过程对提前放行控制方案中的环形交叉口的信号周期,左转绿灯时间,第二停车线绿灯时间;各个相位中的绿灯时间,黄灯时间,全红时间等相关参数进行分析和确定,完成了对相应的信号控制参数进行了最终模型标定和后续优化,进而完成了整个提前放行控制方案的提出和确定过程。最后,通过建立优化控制方案的评价体系。利用VISSIM仿真技术,针对曲靖市区现实存在的环形交叉口流量数据进行调查与合理预测。将提前放行控制方案与对称放行控制方案进行对比,表明提前放行控制方案可以缩短信号周期。在不同流量差异性存在的情况下,按照两种不同的信号控制方案分别进行仿真分析,经过对称控制放行控制方法和优化控制方法两种方案对实例交叉口的仿真结果比较分析,表明了优化控制方案具有优越性和适用性。
[Abstract]:In the case of low traffic demand, circular intersections can make vehicles flow smoothly, not only eliminate conflict points, but also improve the safety of traffic. But in recent years, With the continuous increase of traffic flow, the simple uncontrolled roundabout is no longer applicable. The second stop control method for the left turn flow at the circular intersection was put forward by Yang Xiaoguang and others of Tongji University. This method can not only enlarge the capacity bottleneck of the annular intersection, but also increase the capacity of the annular intersection. But the second control method of left turn is usually controlled by symmetrical two phase signal. In practical use, the probability of flow in each direction of the annular intersection is quite small. When there is a difference in the flow in the direction of two entry channels, the control scheme of symmetrical release is still used. In the same phase, the utilization of the inner loop in the inlet direction intersection is uneven, and the green light time utilization in the phase of the inlet direction signal is uneven. Therefore, it is necessary to study the secondary control of the left turn in the circular intersection. This paper mainly introduces the existing symmetrical release control scheme for the left turn secondary signal control of large circular intersection. This paper also analyzes and summarizes the problems of the lack of effective green light time utilization rate and the lack of efficiency of ring space utilization under the condition of traffic flow difference in reality. The specific conditions of the conventional symmetrical left turn secondary signal control scheme and the specific calibration process of the parameters of the signal control scheme are described in detail. The main innovation of this paper lies in the fact that, According to the underutilization of the loop space in the symmetrical direction control scheme, a new method of utilizing the residual loop space is proposed. The control method of the traffic flow in the direction of high flow inlet in advance is analyzed in detail. The detailed thinking and optimization steps of the control strategy of the control scheme are analyzed in detail. In view of the flow difference in the implementation process of the control scheme, The overall situation of each phase time of the relevant inlet channel is analyzed, and the flow rate of the relevant inlet channel is corrected. Finally, Combined with the corresponding parameter calibration process of the conventional symmetrical left turn secondary signal control scheme, the signal period, the left turn green time and the second stop line green time of the circular intersection in the early release control scheme are studied. The green time, yellow light time, all red time and other related parameters in each phase are analyzed and determined, and the final model calibration and subsequent optimization of the corresponding signal control parameters are completed. Finally, through the establishment of the evaluation system of the optimal control scheme and the use of VISSIM simulation technology, Based on the investigation and reasonable prediction of the actual flow data of circular intersection in Qujing city, this paper compares the advance release control scheme with the symmetrical release control scheme. The results show that the early release control scheme can shorten the signal cycle. Under the condition of different flow difference, the simulation analysis is carried out according to two different signal control schemes. The comparison and analysis of the simulation results between symmetric control release control method and optimal control method show that the optimal control scheme has advantages and applicability.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491.54

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