论文标题:基于PLC的交通十字路口模糊控制
论文作者
论文导师 吴国忠,论文学位 硕士,论文专业 电力电子与电力传动
论文单位 浙江大学,点击次数 194,论文页数 66页File Size3799K
2006-07-01论文网 http://www.lw23.com/lunwen_47585412/
Traffic control signals;; Ladder;; Fuzzy control;; PLC;; Hardware realize
城市交通信号控制是通过对交通流的调节、警告和诱导以达到改善人和货物的安全运输，提高运营效率。目前，就我国大多数城市而言，已经建立了多种交通信号控制系统，与此同时，交叉口单点信号控制仍是主要的信号控制方式，其中定时控制所占的比例较大，在一些交通流量波动较大的交叉口，实现信号模糊控制已迫在眉睫。 交通系统是一个具有随机性、模糊性和不确定性的复杂系统，建立数学模型非常困难，有时甚至无法用现有的数学方法加以描述。早期采用的定时信号控制正在淘汰过程中，目前大多采用的是自适应信号控制，它需要数学建模，且不考虑交通延误、停车次数等。所以经典控制法很难得到满意的效果。而模糊控制是一种无须数学模型的控制方法，它能模仿有经验的交警指挥交通时的思路，达到很好的控制效果。近些年来我国的许多学者也都以不同的思路对单个交叉口、交通干线的模糊控制进行了研究，但因局限与学者的理论研究，实际应用的寥寥无几，本文实现了基于PLC的交通信号的模糊控制系统。 根据前后相流量来决定信号灯配时的模糊控制系统的理论研究成果，用PLC实现单个十字路口交通信号灯模糊控制的方法，以单个十字路口4相位交通灯为例，把PLC作为一个模糊控制器，采用梯形图编程。 通过实验保证了系统运行稳定可靠，能根据不同的交通流量进行模糊控制决策，优化信号灯的配时，从而可以有效的解决交通流量不均衡、不稳定带来的问题。
The municipal transportation signal control is through the adjustment, the warning and the induction which flows to the transportation achieved improves the person and the cargo safe transportation, enhancing the operation efficiency. At present, our country majority cities have already established the many kinds of traffic signal control system, at the same time, the road intersection simple point signal control was still the main signal control way, timed control occupies proportion bigger, undulates a bigger road intersection in some traffic flows, to realize the signal fuzzy control to be imminent. Transport system is a random nature, ambiguity and uncertainty of complex systems, the establishment of mathematical models very difficult and sometimes impossible to use existing mathematical methods described. Early signals control is regularly used by the process of elimination, the most adaptive signal control is used, it needs mathematical model, without considering traffic delays, number of stops. Therefore, it is difficult to be satisfied with the classical control law results. And vague control is a mathematical model to control methods, it can imitate experienced police directing traffic, ideas, achieve good control results. In recent years many of our scholars have different ideas of individual junction, traffic control Route vague studied, but the limitations of the theory and research scholars, the few practical applications, based on this achievement traffic signals vague PLC control system. According to determine signal distribution and flow of the control system vague theoretical research results, the achievement of individual intersections with traffic lights blur PLC control methods for individual crossroads 4 phase of traffic lights, for example, the PLC as an ambiguous signal controllers using Ladder programming. Through experiments that the reliable operation of the system to a vague under different traffic control decision-making, optimize signal distribution, which can effectively solve traffic imbalance, instability brought.
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