考虑边界交叉口交通拥堵的反馈阀门控制

基于路网宏观基本图(macroscopic fundamental diagram, MFD)实施城市区域交通控制时,为了防止边界交叉口受阻方向的车辆排队长度过长,同时提高路网内车辆完成率,提出了考虑受控区域边界交叉口交通拥堵状况的交通流反馈阀门控制方法,通过对边界控制阀门处路段存放车辆富余空间的分析,提出了阀门交叉口位置和数量选择模型;针对可能造成的阀门交叉口交通拥堵,提出了受控区域边界拥堵交通流分配算法,也即通过提前调节阀门上游交叉口的绿灯时间,把部分交通流提前控制在其它相邻上游交叉口.通过实际路网仿真,结果表明该方法可以有效控制阀门交叉口的车辆排队长度,降低阀门交叉口车辆平均延误时间和平均停车次数.

Feedback gating control considering the congestion at the perimeter intersection

The present study is dedicated to exploring how actualizing the perimeter control on basis of the macroscopic fundamental diagram (MFD) of road network. In order to prevent the over-long queue at blocked direction of perimeter intersection and improve the vehicle completion rate in the network, a feedback gating control method considering the congestion at the perimeter intersection was proposed. A selecting model for intersection location and quantity was proposed after analyzing the surplus volume at the perimeter control gating section. Then, a congestion flow assignment algorithm was put forwarded to deal with the possible traffic congestion at the gating intersection. The assignment algorithm was appliedto control part of the traffic at adjacent upstream intersections in advance by regulating the signal timing (green light time) of gating upstream intersection. The simulation results showed that the proposed method could effectively control the queue length, reduce the average delay and the average number of stops at the gating intersection.