一种新的基于细胞模型车流模拟方法

A Novel Traffic Flow Simulation Method Based on Cell Transmission Model

考虑到原始细胞传输模型(CTM)在处理多细胞汇合、分岔以及多对细胞流线间交叉等情形时存在明显的局限性,通过分析细胞间车流流线关系来反映多种不同细胞连接结构,提出一种新的基于细胞阶段传输车流量累计模拟方法 (简记ASCF-TS),不仅满足了细胞内车流的FIFO规则和细胞输送车流能力约束,同时也能满足流线交叉点的车流输送能力约束,有效处理车流流线交叉产生的优先权问题,增强了CTM模型的适用性。最后的数值算例结果表明,所提出的ASCF-TS车流模拟方法能有效处理多细胞汇合、分岔情形,且相比较于原始CTM模型,能模拟出车流在交叉口流线交叉的滞后影响,方法具有较强的时间有效性。

In view of the original cell transmission model （CTM） is obvious insufficient in the treatment of such case just like multi-cellular merge, diverge and multiple-twin intercellular streamlines cross, a new traffic flow simulation method based on the accumulative staged cell transmission flow （ASCF-TS） is put forward, which indicates different types of cell connection structure by analyzing the relation of intercellular traffic streamlines. The proposed method not only can meet the intraeellular traffic flow FIFO criterion and intercellular transmission capacity constraints, but also can satisfy the transmission capacity constraints of traffic streamlines intersection, meanwhile it can effectively deal with the priority problem among the crossed traffic streamlines, enhance the CTM model applicability. The final numerical calculation example result indicates that （ 1 ） the proposed ASCF-TS method can effectively accomplish multi-cellular merge and diverge conditions; （2） compared to the original CTM, it can simulate the delay impact suffered from the crossed traffic streamlines at intersection. Time effectiveness of this method is guaranteed.