进出口道综合效率最优的交叉口配时参数优化方法

Optimization method of signal timing parameters considering comprehensive efficiency of all approach lanes

针对分时段定周期控制的单点交叉口,从进口路段和出口路段的整体效益出发,提出一种以优化时段内交叉口所有路段的周期平均车辆数之和最小为控制目标的优化思想。基于目标路段及相应出口路段的剩余容纳能力限制,确定了路段每周期的最大输入量和输出量,提出路段实时容纳车辆数的计算方法;考虑相位最大绿灯时长及最小绿灯时长等因素的约束,建立进、出口路段综合效益最优的相位绿灯时长优化模型。最后,设计相关实例并通过遗传算法进行求解。结果表明:本文模型可同时适用于过饱及低饱和状态下的信号参数优化,并能有效防止排队上溯现象的发生,可为包含短连线路段交叉口的信号参数优化提供一种新的理论参考。

Aimed at some isolated intersections with fixed time strategy,the optimization idea of minimizing the number of vehicles in all approach lanes within the optimization horizon was proposed taking the comprehensive efficiency of all approaches lanes as the optimization objective.The maximum output and input per cycle were determined based on the residual capacity of objective lane and corresponding downstream lanes,and then the calculation method of the number of vehicles in one special lane at the beginning of one cycle was advanced.On this basis,the optimization model of signal timing parameters considering the comprehensive efficiency of all approach lanes was established with the restrictions of the minimum and maximum durations of one phase.Finally,two cases were finished by GA algorithm.The results show that the new method can be applicable both under oversaturated and low-saturated conditions,and meanwhile,it can also prevent the occurring of queue spillover effectively.This research may provide a new theory reference for determining the signal timing parameters especially when the intersection includes bottlenecks.