Fuzzy Control, The Plc-based Traffic Intersection

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.