基于Petri网的城市交通控制混合系统模型

城市道路交通信号控制是典型的混合动态系统,既包含连续状态变量又包含离散状态变量.本文归纳研究了信号控制交叉口群的主要构成元素：交通信号控制、交叉口与道路路段,其中交通信号控制与交叉口两个元素属于离散事件动态系统（DEDS）,而道路路段交通流属于连续时间动态系统（CVDS）.然后,应用混合系统建模理论,分别构筑了交通信号控制的petri网模型、交叉口的petri网模型、道路路段交通流的连续系统模型,以及交叉口petri网模型与路段交通流模型之间的接口.该模型具有既能够进行交通控制信号优化与交通阻塞机理解析应用,又便于计算机软件实现的优点.

A Model of Urban Traffic Control Hybrid Dynamic System Based on Petri Net

Urban Traffic Control System is a typical Hybrid Dynamic System(HDS),since it includes both continue variances and discrete variances.This paper concludes the urban signalized intersections into three components: traffic signal control,intersections and the road segments,among which,traffic signal control and intersections are Discrete Event Dynamic Systems(DEDS),while the road segment is the Continuous Variance Dynamic System(CVDS).Then,with the application of HDS modeling theory,the traffic signal control Petri net model,the road intersection Petri net model,the road segments section traffic flowed model,and the interface between road intersection Petri net model and the road section model are constructed.Thess models have advantages to carry on the traffic control signal optimization and the traffic jam mechanism analysis.Furthermore,it is easily for the computer software realization.