Dynamic signal timing algorithm at single-point intersection based on queuing condition
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摘要: 以绿灯末尾排队状态为目标, 研究了二相位控制单点交叉口的动态信号配时。根据排队形成和消散过程建立了排队模型, 分析了信号周期、绿信比和到达率对排队状态的影响。以两相位排队均处在弱欠饱和状态为控制目标, 提出了随到达率变化的简便信号配时算法, 根据总流量比计算信号周期, 根据较大的流量比调节主相位绿信比。仿真结果表明: 信号周期缓慢地同向改变两相排队状态, 绿信比反向改变两相排队状态, 到达率仅改变相应相位的排队状态。当交叉口饱和流率为0.50 pcu·s-1, 黄灯和绿灯前损时间为4 s, 到达率在0.10~0.26 pcu·s-1之间变化时, 两相排队始终都在弱欠饱和状态, 说明配时算法是有效的。Abstract: The queuing states in the green end were taken as objective, the dynamic signal timing at single-point intersection under the control of two-phase signal was studied, a queuing model was built according to the queuing and discharging process, and the effects of signal cycle, split and arrival ratio on the queuing states were analysed.A signal timing simple algorithm following the fluctuation of arrival ratio was put forward when two phases were in little under-saturation queuing states, the cycle was calculated according to the total ratio of flow volume, and the split of main phase was adjusted depending on the higher ratio of flow volume.Simulation result indicates that the cycle slowly changes both phases queuing conditions in the same direction, the split changes them in the reverse direction, and the arrival ratio only alters the queuing conditions of corresponding phases.When saturation flow rates are 0.50 pcu·s-1, the times of yellow and green former losses are 4 s, and the arrival ratio varies from 0.10 to 0.26 pcu·s-1, two phases are in little under-saturation queuing states, so the algorithm is effective.
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表 1 信号周期与主、次相位绿信比计算结果
Table 1. Computation result of signal cycles, splits of primary and secondary phases
到达率/(pcu·s-1) q1=0.21q2=0.16 q1=0.25q2=0.14 q1=0.14q2=0.27 q1=0.18q2=0.24 周期/s 87 113 164 211 主相位绿信比 0.49 0.56 0.59 0.52 次相位绿信比 0.42 0.37 0.36 0.44 
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