大周期内的相位差优化方法

Offset Optimization Method in Large-Cycle Control Period

以往干道信号协调的研究只能解决周期时长相同的交叉口的协调问题。为了满足实际交通信号控制系统的需求,解决同一干道上不同周期子区间的协调控制问题,将现有的干道绿波协调控制方法扩展以实现路网内不同周期干道间的协调控制显得尤为重要。本文考虑不同周期交叉口间的相位差周期性变化导致车流到达分布的周期性波动现象,定义了大周期控制时段,绘制了大周期时段内上下游交叉口间的时距图;提出了大周期内的相位差优化方法;通过分析不同控制方案的过渡原理,提出了相位差动态调整方法。本文提出的方法突破了原有协调模型要求交叉口信号周期长度必须相同的限制,可推广应用到不同周期干道的信号协调中,真正实现由干线扩展到整个区域,对于改善区域路网的交通运行具有重大实际意义。

The previous research about arterial signal coordination could only solve the problem of coordination of intersections with the same signal cycle length. In order to meet the needs of the actual traffic signal control system and solve the coordinated control problem of zones with different cycles on the same trunk road,it is particularly important to extend the existing trunk green wave coordinated control method to realize coordinated control between different cycle trunk roads in the road network. This paper considers the periodic variation of the phase difference between different periodic intersections and the arrival and distribution of traffic flow exhibiting periodic fluctuations. The period of large-cycle control is defined and the time-distance map between the upstream and downstream intersections within the period of large cycle is plotted. Then the method of offset optimization in the large period is proposed. By analyzing the principle of the transition about different control schemes,the dynamic offset adjustment method is proposed accordingly. The offset optimization method proposed in this paper can break through the limitation that the original coordination model requires that the signal cycle length of the intersection must be the same. It can be applied to signal coordination of trunk roads of different periods. It has great practical significance for improving the traffic operation of the regional road network for extending from the arterial to the entire area.