摘要
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。
To optimize green time of isolated intersection, a hybrid Petri net model （HPN） in urban traffic network was given in terms of the dynamics of traffic flow and the discrete characteristic of traffic light. In this model, a continuous Petri net was adopted to de- scribe capacity of intersection and reflect the variation of traffic flow, while the traffic light control of each phase was represented by a timed Petri net. Besides, each phase had its own Petri net to control the green time extension. After the execution of minimal green time, to obtain the optimal green time, the green time extension was decided by inhibit arc according to the number of vehicle waiting to pass through the intersection. Finally, a computer simulation was given by using this model. The simulation result indicates that the scheme can realize a more effective control of isolated intersection.
出处
《控制工程》
CSCD
北大核心
2012年第5期771-774,共4页
Control Engineering of China
基金
甘肃省自然科学研究基金计划项目(0803RJZA020)
