基于PLC控制的十字路口交通灯信号系统

The Design of the Traffic Lights Controlled by PLC

根据十字路口交通灯的控制要求,采用PLC设计实现正常交通的时序控制,通过传感器完成对交通异常状况的智能判别及处理。在系统的设计中,主要使用了PLC可编程序控制器和传感器相结合的一种智能控制方法,使用压轴式传感器采集车辆脉冲,用PLC高速计数器对脉冲进行计数,根据取得的数据运用一定的智能控制原则自动调节红绿灯的时间长度,最大限度地减少车辆滞留现象,较好地解决了车流量不均衡、不稳定问题。理论结果表明,该系统设计方案可以达到预期目标。

According to the. requirements of the crossroads traffic lights control, the PLC design is used to achieve the sequential control of the normal transportation, through the sensor to complete the intelligent distinction and processing of the abnormal traffic conditions. In the design of the system, one method of intelligent control is used which combines the Programmable Logical Controller and the Sensor, uses the shaft-type sensor to gather vehicles pulse and the high speed counter of the PLC to count the number of the pulse, uses certain principles of intelligent control to adjust the length of traffic lights automatically according to the data obtained, reduces the phenomenon of the vehicles stranded in a large scale, solves the problems of not equilibrium and unstable traffic flow magnitude well. The theoretical results shows that the system designed can achieve the anticipated target.