【作者】 罗湘武；

【导师】 龙科军；

【作者基本信息】 长沙理工大学 ， 交通信息工程及控制工程， 2009， 硕士

【摘要】 本文针对“近交叉口公交站点”这一特殊情况,即公交站点位于交叉口上游,且离交叉口距离较近,研究交叉口公交优先控制方法及其控制方案。论文针对近交叉口公交站点的公交车优先需求和公交车运行特点,设计了公交信号优先控制的系统结构。考虑到近交叉口公交站点的特殊情况,将检入检测器设置在公交站点的上游。采用最小二乘法建立了公交车车头时距与公交车在站点停靠时间的线性函数,预测公交车辆到达停车线的时间。考虑到公交车辆到达交叉口停车线时间的不确定性,提出了“优先窗口”的概念,即公交车到达停车线的时间区间。通过对优先窗口的边界时刻进行分析,系统决策是否为公交车辆提供优先信号以及选择何种优先控制策略,同时对实施公交优先控制的信号各相位绿灯时间进行调整,以保证信号周期的长度保持不变,当前周期结束后,系统恢复原有的配时方案。针对我国公交车辆线数多、发车频率高的实际情况,本文提出了多辆公交车在同一时间段内先后驶入交叉口情况下的控制方案。论文对该控制方案进行了案例仿真试验研究,通过模拟四相位十字形交叉口的交通运行情况,分别采用定时控制和公交优先控制方式进行仿真实验。实验结果表明:公交优先控制方式能有效地减少公交乘客在交叉口的平均等待时间,实现公交车辆在交叉口时间通行权上的优先。更多还原

【Abstract】 In view of the special condition of“bus stops near intersections”, i.e., bus stops at the upper reach of and near intersections, the thesis studies bus priority control at intersections and its control schemes.In accordance with the bus priority demand at bus stops near intersections and bus running features, the thesis designs a systematic structure of bus priority signal priority control. Owing to the special location of the bus stop near the intersection, check-in detector should be set at the upper reach of the bus stop. Establishing the linear function of headway and the stop time at the stop by adopting least square method, the thesis predicts the time when the bus reaches the stopping line at the intersection. Given that the stopping time of the bus at the stop is uncertain, the thesis puts forward the concept of“priority window”, i.e. the time interval when the bus arrives at the stop line. After analyzing the boundary time of the priority window, the system decides on whether to provide priority control for the bus and which priority control strategy should be employed. Meanwhile, each phase’s green time of the signal period under bus priority control is adjusted to ensure that the length of the signal period is unchanged and the timing plan is recovered after the period. In view of the large number of bus lines and the frequent departure time of buses in China, the thesis puts forward the control strategy used when several buses enter the intersection simultaneously.The thesis researches the simulation experiment of the system; it simulates the traffic running situation at a four-phase cross-type intersection. The fixed-time control mode and the bus priority control mode are employed respectively to carry on the simulation experiment. The experiment result shows that the bus priority control mode can effectively reduce the passengers’average waiting time at the intersection, and achieve the bus priority of the time right of way at the intersection.更多还原