考虑远端停靠站的交叉口公交优先控制方法

Bus Signal Priority Strategy for Isolated Intersection with Far-side Bus Stop

建立了考虑交叉口端停靠站排队的公交到站时间计算模型.在此基础上,提出以交叉口和停靠站构成的系统为对象的信号优先控制总体逻辑和优化模型.模型以公交车辆在出口道停靠站时刻表偏差最小和社会车流延误最小为优化目标,能够响应公交车辆"早到"和"晚点"两种情形,同时考虑了相位长度约束、优先策略适用条件约束、公交停靠站排队长度约束和相位饱和度约束.算例针对不同停靠车辆数下信号优先进行了分析,结果表明,不考虑远端停靠站排队和公交运行状态无条件提供优先,可能导致更大的公交运行时刻表偏移值;缺乏对远端停靠站排队的考虑,可能导致交叉口的信号优先策略失效.而本模型能够较好地解决上述问题,取得信号优先的满意解.

A model to calculate bus delay at intersection with far-side bus stop was first built,then a new bus signal priority control strategy was proposed.The system composed by intersection and far-side bus stop was adopted as control object.A multi-objective model,composed by minimization schedule deviation and minimization average delay of other motor vehicles,was built.Two kinds of buses,＂early bus＂ and ＂late bus＂ were considered in the optimization process of the model.Constrains including phase length,queue length,strategy adaptability and degree of saturation of every movements were also considered in the model.The results of a case study show that the efficiency of bus signal priority is affected evidently by the queue at far-side bus stop.It may lead to a larger bus schedule deviation and priority invalidation if the queue at far-side bus stop and bus status are neglected in the signal optimization process.With the proposed model,the above problems can be solved and the pareto-optimal solution can be obtained.