中文摘要：

为了准确表征无信号交叉口的车流通行状况，提出了基于混杂Petri网的车流通行模型。该模型将交叉口车流分成不同的优先级别，分别计算每个级别通过交叉口的车流量和排队车辆数，以此表征它们在交叉口的通行状况，其中车流通行优先级别用离散Petri网表示，车流在交叉口的连续通行状况用时延Petri网表示。仿真结果表明：该模型能够比较有效地描述无信号交叉口车流通行的基本特性，满足城市路网建模的需要。

英文摘要：

In order to represent passing conditions of traffic flow at non signalized intersections, a passing model of traffic flow based on hybrid Petri nets （HPN） was proposed. In the model, the traffic flow were classified into different priority levels, and the indexes of traffic flow at each priority level, such as the volume of traffic flow passing through intersections, the number of queuing vehicles could be obtained respectively, so the passing conditions of traffic flow were represented. The priority levels of passing conditions of traffic flow at intersections were represented by discrete Petri net, whereas the passing conditions of consecutive traffic flow were represented by timed Petri net. The simulation results show that the model can depict the characteristics of passing conditions of traffic flow at non-signalized intersections effectively, so it can meet the requirements of modeling of the urban traffic networks.