城市交通网络的混杂Petri网建模

针对城市交通网络中的动态车流具有连续时间特性而动态信号灯具有离散事件特性的情况, 采用混杂Petri网建立了一个四相位信号交叉口模型，该模型包含了城市交通网络中的连续车流动态和离散信号灯动态.在此基础上分析了交叉口各个方向的输入、输出车流动态，并与四相位信号交叉口的物理模型相对比，结果表明该混杂Petri网模型能够较好地描述城市交通网络的混杂特性.仿真结果表明了混杂Petri网模型的有效性.

Hybrid Petri net modeling for urban traffic network

For the case that vehicle flow shows continuous behavior and traffic lights exhibit discrete event behavior, a hybrid Petri net model of a four-phase signalized intersection was given, in which the continuous time sub-model represented the vehicle flow behavior of urban traffic network and the discrete event part represented the traffic light behavior. Compared with the physical model of a four-phase signalized intersection, all directional vehicle flows of the crossing were analyzed. Analysis of the flow and the traffic light of the model showed that the Petri net model could perfectly represent the hybrid character of the traffic network. Simulation showed the validity of the method.