潮汐干线交通信号协调控制模型

Signal coordination control model for tidal arterial intersections

为缓解城市布局等问题导致的潮汐交通拥堵现象,提出了一种潮汐交通状态下的干线信号协调控制策略.依据交通供需关系及交通量进出平衡,构建了以干线吞吐量最大化为优化目标的混合整数线性规划模型.基于冲击波理论,构建了以过饱和方向车均延误最小化为优化目标的二次规划模型.通过引入松弛变量实现可变带宽绿波的分段优化,构建了以非饱和方向带宽最大化为目标的混合整数线性规划模型.采用三阶段优化方法求解模型,获得潮汐干线的最优控制方案.算例结果表明,本文提出的模型能优化干线吞吐量,控制过饱和方向的延误,并为非饱和方向提供可变带宽绿波,从而满足潮汐交通需求.

This paper proposes an arterial coordinated control strategy for tidal traffic to alleviate the tide traffic congestion caused by the urban layout problems.According to the relationship between traffic supply and demand as well as the balance between inflow and outflow,a mixed integer linear programming model was built to maximize the throughput.A quadratic programming model was built to minimize the average vehicle delay in the oversaturated direction based on shockwave theory.By introducing the relaxation variable,a mixed integer linear programming model was built to maximize the variable bandwidth by segments in unsaturated direction.The three-stage optimization method was used to solve the model and obtain the optimal arterial control scheme.The numerical example results indicate that the proposed model can optimize the throughput of arterial and delay in oversaturated directions,and obtain the variable bandwidth green wave in the unsaturated direction,thereby meeting the tidal traffic demand.