【摘要】 设计的城市道路区域交通信号控制系统采用P89LPC952单片机作为各路口控制器,通过RS-485总线与上位机进行通信,I2C总线接收由车辆检测装置检测到的实时车流量信号。上位机根据实时车流量信号进行分析计算,得到优化的信号配时方案,传送给各路口控制器,控制各路口交通信号灯的变化,实现各路口通行、禁行时间的倒计时显示。各路口控制器可工作在单机控制和通信控制2种模式下,既可根据上位机指令进行路口控制,又可独立控制路口,实现区域内多路口的交通信号控制。更多还原

【Abstract】 The traffic signal control system in urban road area uses P89LPC952 MCU as local intersection controller units,which can communicate with a master control unit PC by RS-485 bus,and can receive the real time traffic flow data measured by the measuring and testing equipment through I2C bus.At the same time,the master PC can analyze and calculate the received data,achieve the optimized signal time schemes,then transmit them to local control unit to control the change of traffic lights,and achieve the display of the time of passing and waiting.The local controller unit can work in double modes;it can work by the instruction of the master PC and also can work independently to control the traffic signal in the intersections of the urban road area.更多还原