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为优化交叉口绿灯时间,根据交叉口交通流的动态属性和交通信号的离散属性,建立了城市交通网络中单交叉口信号控制的混合Petri网模型。用连续Petri网描述交叉口容量和交通流变化,用离散时延Petri网控制交叉口各个相位的交通信号,每个相位都有控制绿灯延长时间的Petri网模型。在执行了最短绿灯时间后,根据当前等待通过的车辆数,通过禁止弧对绿灯延长时间加以控制,以确定最佳绿灯时间。最后对该模型进行计算机仿真,仿真结果表明该方案对单一交叉口实现了更有效的控制。
In order to optimize the green light time of the intersection, a hybrid Petri nets model of single intersection signal control in urban traffic network is established according to the dynamic properties of traffic flow and the discrete attributes of traffic signals. The continuous Petri nets are used to describe the capacity of intersections and traffic flow changes. Discrete-time Petri nets are used to control the traffic signals at each phase of the intersections. Each phase has a Petri net model that controls the green light extension time. After the shortest green light time has been executed, the optimal green light time is determined by prohibiting the arc from controlling the green light extension time based on the number of vehicles currently waiting to pass. Finally, the model is simulated by computer. The simulation results show that this scheme can achieve more effective control on a single intersection.