摘要
针对城市交通系统特性,建立了反映交通流动态属性的赋时连续Petri网模型和交叉口信号控制的离散时延Petri网模型。设计专门的Petri网模型控制每个相位的红灯时间,一旦等待时间达到最长允许红灯时间,该相位信号灯强制转为绿灯,可避免相位红灯时间过长导致的驾驶员违规问题。为优化交叉口绿灯时间,根据单个因素的隶属度,通过模糊Petri网按照模糊规则综合确定当前相位绿灯延长时间。仿真结果表明,该方案对单一交叉口实现了较有效的控制。
Taking into account the properties of urban traffic system, a timed continuous Petri net model and a discrete timed Petri net model are given to reflect the dynamic attribute of traffic flow and the discrete attribute of traffic signal. A special Petri net model, which can insure that the traffic light will be changed to green compulsively as soon as the duration of red light is equal to the maximal red light time, is designed to control the red light time, so as to avoid the violation of traffic regulations for drivers because of too long red time. To optimize green time of isolated intersection, according to the degree of membership of single factor, the green time extension of current phase is calculated comprehensively by adopting fuzzy Petri net and some fuzzy rules. The simulation results indicate that this scheme can realize a more effective control of isolated intersection.
出处
《控制工程》
CSCD
北大核心
2013年第3期544-548,共5页
Control Engineering of China
基金
国家自然科学基金项目(71161016)
兰州交通大学青年基金(2011023)
