基于匝道排队长度约束的高速公路启发式控制方法
发布时间：2018-11-04 19:56
【摘要】：随着高速公路运输量稳定增长,交通拥挤不断发生。为了解决主线拥挤和入口匝道排队溢出问题,提出了基于匝道排队长度约束的改进启发式控制方法,以实时确定协调匝道个数,准确预测动态临界占有率,为高速公路匝道调节提供有效方法。根据主线的交通状态和匝道的排队长度设计协调匝道确定规则,从而实时确定协调匝道组的匝道个数,以扩大协调匝道组的空间容量,缓解主线交通拥挤压力。利用实时检测的入口匝道下游合流区的交通通过量和占有率数据设计动态临界占有率预测算法,将动态临界占有率嵌入控制方法中,以适应交通状态发生变化时主线临界占有率的变化,实现主线交通通过量最大化。应用VISSIM微观仿真软件,以沿江高速公路为仿真背景,从路网性能、入口匝道下游合流区交通状态和入口匝道公平性三方面对控制效果进行评价。相比其它匝道排队长度约束控制方法,本文提出的改进控制方法,使路网总行程时间(TTS)减少约3.4%;使入口匝道下游合流区的占有率维持在动态临界占有率附近,使合流区的交通通过量在交通状态发生突变时增加1680veh/h;使各个匝道之间的平均延误时间和排队长度相均衡,保证了匝道公平性。本文提出的改进启发式控制方法,在保证主线通过量优化的前提下,还能防止入口匝道排队溢出,比较适合拥挤条件下的入口匝道协调控制。
[Abstract]:With the steady growth of highway traffic, traffic congestion occurs constantly. In order to solve the problem of main line congestion and queue overflow of on-ramp, an improved heuristic control method based on queue length constraint of ramp is proposed to determine the number of coordinated ramps in real time and accurately predict the dynamic critical occupancy rate. It provides an effective method for highway ramp adjustment. According to the traffic state of the main line and the queue length of the ramp, the coordinated ramp determination rules are designed to determine the number of the ramp of the coordinated ramp group in real time, in order to expand the space capacity of the coordinated ramp group and relieve the traffic congestion pressure of the main line. The dynamic critical occupancy prediction algorithm is designed by using the traffic throughput and occupancy rate data of the downstream confluence area of the on-ramp, and the dynamic critical occupancy rate is embedded in the control method. In order to adapt to the change of the critical occupancy of the main line when the traffic state changes, the traffic volume of the main line can be maximized. Based on the simulation of the highway along the Yangtze River, the control effect is evaluated from three aspects: the road network performance, the traffic condition in the downstream confluence area of the on-ramp and the fairness of the on-ramp by using the VISSIM microcosmic simulation software. Compared with other ramp queue length constraint control methods, this paper proposes an improved control method to reduce the total travel time (TTS) of the road network by about 3.4 points. The occupation rate of the downstream confluence zone of the on-ramp is kept near the dynamic critical occupation rate, and the traffic throughput in the confluence zone increases by 1680veh-1 / h when the traffic state changes. The average delay time and queue length of each ramp are balanced to ensure the fairness of the ramp. The improved heuristic control method proposed in this paper not only ensures the optimization of the main line throughput, but also prevents the queue overflow of the on-ramp, which is more suitable for the coordinated control of the on-ramp under crowded conditions.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U491
本文编号：2310980
[Abstract]:With the steady growth of highway traffic, traffic congestion occurs constantly. In order to solve the problem of main line congestion and queue overflow of on-ramp, an improved heuristic control method based on queue length constraint of ramp is proposed to determine the number of coordinated ramps in real time and accurately predict the dynamic critical occupancy rate. It provides an effective method for highway ramp adjustment. According to the traffic state of the main line and the queue length of the ramp, the coordinated ramp determination rules are designed to determine the number of the ramp of the coordinated ramp group in real time, in order to expand the space capacity of the coordinated ramp group and relieve the traffic congestion pressure of the main line. The dynamic critical occupancy prediction algorithm is designed by using the traffic throughput and occupancy rate data of the downstream confluence area of the on-ramp, and the dynamic critical occupancy rate is embedded in the control method. In order to adapt to the change of the critical occupancy of the main line when the traffic state changes, the traffic volume of the main line can be maximized. Based on the simulation of the highway along the Yangtze River, the control effect is evaluated from three aspects: the road network performance, the traffic condition in the downstream confluence area of the on-ramp and the fairness of the on-ramp by using the VISSIM microcosmic simulation software. Compared with other ramp queue length constraint control methods, this paper proposes an improved control method to reduce the total travel time (TTS) of the road network by about 3.4 points. The occupation rate of the downstream confluence zone of the on-ramp is kept near the dynamic critical occupation rate, and the traffic throughput in the confluence zone increases by 1680veh-1 / h when the traffic state changes. The average delay time and queue length of each ramp are balanced to ensure the fairness of the ramp. The improved heuristic control method proposed in this paper not only ensures the optimization of the main line throughput, but also prevents the queue overflow of the on-ramp, which is more suitable for the coordinated control of the on-ramp under crowded conditions.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U491
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