2070软件手册(一)课件.ppt

Operations Manual forNEMA TS2 and 2070 Controllers （一） 一、基本操作 相位基本参数 Ring, sequence Overlap 相位基本参数 The purpose of a traffic signal controller is to service demand for right-of-way from vehicles and pedestrians phases competing for green and walk time. A phase is a composite of vehicle and pedestrian intervals assigned to each traffic movement at an intersection. 检测器 两种，Vehicle detectors and pedestrian detectors (push-buttons) 作用，call and extend. 三种感应模式 车辆感应模式 流量密度感应模式 行人感应模式 感应控制 在一个给定的最小绿灯时间内，绿灯无条件地开通。该时间过后，若位于停车线前方一定距离外的检测器检测到一辆车到达，则追加一小段绿灯时间。若一直检测 有车到达，则绿灯时间一直被延长，直到最大绿灯时间到了为止。若在追加的一段绿灯时间内没有车到达，则信号灯被切换到下一相位，放行下一方向的车辆。 车辆感应模式 工作原理 Vehicle actuated mode guarantees a minimum green period to service vehicle calls received during the red interval. Vehicle detectors may extend the minimum green up to a Max1 or Max2 limit unless a Gap,extension timer expires. Vehicle actuated mode applies a fixed Gap,extension timer to limit the extension of phase green. 实现 两个计数器 相位时间（Vehicle Extentions） Gap,extension Red rest and red revert A phase will dwell (or rest) in the green interval in the absence of a conflicting call unless Red Rest is programmed for that phase. Red Revert restricts how quickly a phase may be reserviced once it has entered red rest and another call is received for that phase. 总结 保证最小绿灯时间 通过车辆间隔限制绿灯时间 在收到冲突相位请求后，限制最大绿灯时间。 流量密度模式（volume density mode) 工作原理 Extending Minimum Green based on the number of vehicle calls during the yellow and red intervals Reducing Gap, extension over a specified period to a specified minimum gap setting 实现 The variable initial time is essentially the sum of the Minimum Green and the accumulated Added Initial time. The Added Initial parameter specifies the number of seconds accumulated per actuation during the yellow and red interval of the phase. Variable initial time may not be increased beyond the limits of the Max Initial parameter. The accumulated Added Initial time is reset after the phase green has be