【作者】 易俊华；

【导师】 阳春华；

【作者基本信息】 中南大学 ， 控制工程， 2010， 硕士

【摘要】 随着我国经济的快速发展以及城市化进程的加快,近年各大城市机动车数量急剧增加,交通问题已成为亟待解决的民生问题之一。城市交通系统的道路车辆流量具有较大的时变性和随机性,传统交叉口信号灯控制方法已难以满足交叉路口的通行量、疏导时间等需求。针对这一问题,引入模糊逻辑算法,设计了一种实时的智能交通信号控制系统。该系统利用车辆计数传感器获得各路口的车流量,根据交叉路口现状设计了一个单变量二维模糊逻辑控制器。该控制器以等待车辆数量和交叉方向等待车辆数量之差作为输入,绿灯延时作为输出。其中,模糊控制规则表在离线状态下转化为查询表,并存储于计算机中以供系统在线查询。实际应用时,系统通过查表根据路口等待车辆数量变化自动调节绿灯时间。本文提出了该智能交通信号控制系统的软硬件设计方案。系统以AT89S52单片机为核心,利用Intel8279芯片为键盘及显示器接口电路,采用C语言开发了具有交通灯控制、功率驱动、绿切等功能的交通灯模糊逻辑控制器。采用路口交通实例,对两种不同信号控制方式进行仿真实验和现场测量比较。试验结果表明感应控制方式优于多时段定周期控制,在交叉口流量较小的情况下表现得更突出。虽然实时交通数据和状况的不断地更新,但实时模糊控制系统仍能保证最优的交叉路口利用率,缩短了车辆平均等待延误时间。更多还原

【Abstract】 With the rapid economic development and the speeding up urbanization process, the number of motor vehicles has been increasing sharply resent years, which leads the traffic problem to one of the urgent livelihood problems in China. Due to the time variation and randomness of the intersection vehicle flow in the modern urban transport system, the conventional control method of intersection traffic light has become difficult to meet the demands of traffic intersection such as the traffic capacity, traffic dispersion and so on.According to the problems, a real time intelligent traffic signal control system is projected based on fuzzy logic algorithm. The traffic flow of each intersection is acquired through the vehicle counting sensors in the system. And a single variable fuzzy logic controller with two dimensions inputs is designed aimed, the inputs of which are the number of waiting vehicles under the green light phase and the difference between and the number under the red light phase, while the output of which is the delay time of the green light. The fuzzy control rules table is translated into a query table off-time, and then the query table is stored in the memory for querying online. In practice, the green light time is adjust automatically based on the waiting cars in the cross road.The software and hardware of the intelligent traffic signal control system are proposed in the paper. The intelligent traffic signal control system based on fuzzy logic algorithm could control the traffic light, drive power and so on using C language. It adopts AT89S52 microcontroller as the core chip, and Intel8279 as input/output device.Two different ways of signal control are compared with the intersection traffic data. The results show that the vehicle actuated control is better than the multiple interval fixed-time control, and the advantage of the former is distinguished when there is not many vehicles in the cross road. Although the real data and status of the intersection traffic are update continuously, the real fuzzy logic control system can guarantee the optimal adaptability of the intersection, and reduce the vehicle’s average waiting delay time.更多还原