基于Petri网的单点信号优化感应控制

基于连续Petri网,建立交通流混合控制模型,通过分析离散化的交通信号控制混合Petri网模型,研究单交叉口交通信号感应控制问题.基于混合Petri网模型参数的分析,建立了各相位车辆总停留时间的计算方法;从库所标识与变迁使能程度间的复杂关系出发,研究了库所标识的变化规律;以车辆总停留时间最短为目标优化感应控制模型,仿真计算各相位绿灯时间.结果表明:基于混合Petri网的优化感应控制方法,4个相位的车辆平均延误显著缩短,可以较好地实现单点信号控制.

Traffic Signal Actuated Control at Isolated Intersection Based on Petri Net

A hybrid control model of traffic flow was established based on continuous Petri net,and the traffic signal actuated control at isolated intersection was studied by analyzing the discretized hybrid Petri net model of traffic signal control.Based on the analysis of parameters of hybrid Petri net model,the calculation method of total vehicle residence time was presented.According to the complex relationship between the marking of places and the enable degree of transitions,the marking change law of places was studied.By taking minimal average vehicle residence time as the objective,a mathematical model for the optimization of actuated control was established and a simulation was carried out to calculate the green time of each phase.Calculation result indicates that average delay of four phases is shortened significantly and traffic signal actuated control at isolated intersection is better realized by using the optimization method based on hybrid Petri net.