城市交通信号自组织控制规则的邻域重构

为解决城市交通信号自组织控制中,交通流相变频繁及路网拓扑结构复杂等时空条件带来的固定局部规则控制精度的问题,提出一种城市交通信号自组织控制规则邻域的重构方法. 首先,定义邻域为当前路口自组织控制规则构造的关联相邻路口组合；然后,面向当前路口的相邻路口集合空间,应用综合因子分析法及互相关性等方法,构建当前路口与其任意相邻路口在位置上的相对空间表达、在交通流量传递上的相对时间表达,以此实现当前路口与其所有相邻路口的时空量化表达；最后,基于流体力学方程建立信号切换规则,以所构建的时空量化表达为依据,在关联相邻路口集合中重构当前路口自组织控制规则邻域. 仿真结果表明:当前路口最大通行能力、整体通行能力均随邻域的扩大而提升. 邻域重构可以解决固定规则邻域造成的控制精度问题,邻域的扩大也会影响交通流量释放的平稳性.

Neighborhood reconstruction of urban traffic signal self-organizing control rules

To solve the problem of fixed local rule control precision caused by frequent traffic flow phase transition and complex road network topology in self-organizing control of urban traffic signals, this paper proposes a reconstruction method of urban traffic signal self-organizing control rule neighborhood. First, neighborhood was defined as the associated adjacent intersections combination which is constructed by the current intersection with its self-organizing control rules. Next, based on the set of the adjacent intersections of the current intersection, with the combination of the methods such as factor analysis and cross-correlation, the relative spatial expression of location as well as the relative temporal expression of traffic flow transmission between current intersection and any adjacent intersection was constructed so as to realize the time-space quantitative expression between the current intersection and all of its adjacent intersections. In the end, the signal switching rules for the current intersection were established based on the fluid dynamic equation. With the established quantitative relationship, the self-organizing control rule neighborhood of the current intersection was reconstructed in its associated adjacent intersection set. Simulation results show that the maximum capacity and the overall capacity of the current intersection increased with the expansion of the neighborhood. Neighborhood reconstruction can solve the problem of control precision caused by fixed rule neighborhood, and the expansion of the neighborhood can affect the stability of traffic flow release.