单路口多相位交通信号模糊控制系统的设计

Fuzzy Control System Design of Multi-phase Traffic Signals in Isolated Intersection

模糊控制不需建立被控对象的精确数学模型,特别适用于具有较大随机性的城市交通控制。此文同时考虑多相位和倒计时问题,讨论用模糊控制方法对单路口多相位的交通信号进行控制,提出以当前相、后继相的车辆等待长度决定相位信号配时。文中重点讨论该二维模糊控制器的设计,并给出该模糊控制系统的总体设计方案。利用Mcs96提供的Watch Dog,结合软件设计保证系统的稳定性,提高系统的抗干扰能力。由于每一相位的配时是根据路口实时数据经模糊推理一次确定,该系统可用于安装倒计时器的路口,具有良好的实用性。

It is not necessary for fuzzy control to built exact mathematic model about the controlled object, so fuzzy control is applicable especially to control urban traffic with great random characteristic. Having the problems of multi-phase and time backwards be considered, the traffic signal control employing fuzzy control method in isolated intersection is discussed, and a fuzzy control method is proposed which uses current phase and next phase vehicles waiting queue to determine each phase time. With the emphasis on design of the two-dimensional fuzzy controller, the fuzzy control system design scheme is given. Watch Dog in Mcs96 is exploited to ensure the system stability and to raise resisting interference capability of the system. Because each phase time is determined once according to the result of fuzzy inference about real time data of crossing, this system can be used at intersection with time backwards equipment, and it has favorable practicability.