交叉口流线动态控制的优化配时模型研究

Research of Optimal Timing Model Based on Dynamic Control of Traffic Flow at Intersection

针对城市交叉口信号控制仍以单点固定相位方式为主,且配时优化方法不能随交通流线的状态变化而优化的问题,以交通流线相容且绿灯损失最小为原则,根据交叉口进口流线流量动态生成了最优流线组合的相位。在确定周期相位组合的情况下,考虑周期结束流线是否有车滞留,对应分析了流线车辆平均延误。将延误模型组合,建立了适应交叉口流线流量动态变化的优化配时模型,计算了各相位的最优配时,以实现交叉口流线动态优化控制效果。实例计算分析表明:采用流线动态控制配时优化模型延误更小,对改善交叉口运行状况更为有效。

Aiming at the problem that the signal control of urban intersections still mainly using single-point fixed phase and the optimal timing methods cannot optimize traffic along with the alterable state of traffic flow, with the principle of traffic flow line compatibility and the minimum loss of green light, and according to the intersection entrance traffic flow, the phase of optimal flow line combination is dynamically generated. After ascertain the combination of periodic phase, the vehicles＇ average delay of the traffic flow lines is analyzed respectively when the vehicles are detained in the traffic flow line or not at the end of the period. Combining with the delay model, the timing optimal model which can adapt to the dynamic changes of intersection traffic flow is established, and the optimal timing of phases are calculated to achieve the dynamic optimization control of the intersection traffic line. .The calculation example shows that the delay is smaller and the improvement of intersection running state is more effective when using the optimal timing model based on dynamic control of traffic flow.