With the rapid development of the urbanization, the problem of city transportation has been becoming the same issue to each big city in China. As the converge points of urban traffic, the branch junctions are playing an important role in the road net and traffic flow. It is true that traditional PID control algorithm is widely used in various control systems, because its principle is simple, the algrithm is easy to build and has no error in the steady state, etc. However, it does not have good adaptability towards the change of parameters, and is inferior towards interference, etc. According to the above mentioned situation, a self-adaptive Fuzzy-PID control algorithm which retains the characters of conventional PID control algorithm is proposed. The fuzzy control algorithm is used to realize the on-line adjustment of relative PID parameters and signal control of branch lines by adjusting the green time of branch lines. The simulation analysis indicates that the presented method is effective to improve the trunk road efficiency.%随着城市化进程的逐步加快.城市道路交通问题已成为中国各大城市共同面对的难题.而支路口作为城市道路的交汇点之一,在道路网和交通流中起着十分重要的作用.传统的PID控制算法因其具有原理简单,易于实现,稳态qu无静差等优点而被广泛的应用到各类控制系统中,但存在不适应参数变化,超调大,抗干扰性能差等问题.针对支路口q信号这种情况提出模糊自整定PID控制算法.该算法保留了传统PID算法的优点,同时引入模糊控制对支路信号在线整定PID参数调节支路口灯时控制支路车流量,从而提高主干道的交通运行效率,最后通过仿真对控制算法法进行了模拟和研究.
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