单路口交通信号多相位实时控制模型及其算法

Multiphase traffic signal real-time controlling model of isolated intersection and its algorithm

针对城市道路交叉口的交通流特性,对单路口交通信号多相位实时控制的模型和算法进行研究.首先提出一种改进的单路口交通信号多相位实时配时模型,该模型可反映交叉口交通状况的实际需求.同时,采用能随交通需求的变化而实时变化的加权系数,将交叉口3个优化目标函数转化为单目标函数优化的问题.为提高模型的计算速度以及降低交叉口信号机的单机计算量,采用蚂蚁算法中的精英蚂蚁寻优策略求解模型.最后,以伪代码的形式设计了求解该问题的程序流程,并通过一个实例验证了模型及其求解算法是合理的和有效的.

<Abstrcat> Based on urban traffic flow characteristic,a multiphase traffic signal real-time timing model and its algorithm were studied.First,a modified multiphase traffic signal real-time timing model in isolated intersection was proposed,which could reflect traffic demands of different periods.At the same time,the weighted coefficient,changing with traffic request,can transform the multi-optimization problem into a single optimization problem.Then,in order to increase the convergence speed and reduce the calculation quantity of single signal computer,super excellent ant colony optimization strategy of ant algorithm was put forward to solve the model.Finally,the algorithm's procedure concrete realization steps were designed and an example was provided to verify the rationalities and efficiencies of the model and its algorithm.