软件手册（一）ppt课件

Operations Manual for NEMA TS2 and 2070 Controllers （一） 一、基本操作 n 相位基本参数 n Ring, sequence n Overlap 相位基本参数 n 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. n A phase is a composite of vehicle and pedestrian intervals assigned to each traffic movement at an intersection. n 检测器 n 两种， Vehicle detectors and pedestrian detectors (push-buttons) n 作用， call and extend. n 三种感应模式 n 车辆感应模式 n 流量密度感应模式 n 行人感应模式 n 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 n 工作原理 n Vehicle actuated mode guarantees a minimum green period to service vehicle calls received during the red interval. n Vehicle detectors may extend the minimum green up to a Max1 or Max2 limit unless a Gap,extension timer expires. n Vehicle actuated mode applies a fixed Gap,extension timer to limit the extension of phase green. n 实现 n 两个计数器 n 相位时间（ Vehicle Extentions） n Gap,extension n Red rest and red revert n 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. n 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 n 保证最小绿灯时间 n 通过车辆间隔限制绿灯时间 n 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) n 工作原理 n Extending Minimum Green based on the number of vehicle calls during the yellow and red intervals n Reducing Gap, extension over a specified period to a specified minimum gap setting n 实现 n The variable initial time is essentially the sum of the Minimum Green and the accumulated Added Initial time. n The Added Initial parameter specifies the number of seconds accumulated per actuation during the yellow and red interval of the phase. n Variable initial time may not be increased beyond the limits of the Max Initial parameter. n The accumulated Added Initial time is reset after the phase green has been serviced. n Added Initial is set to 1” . n “times per actuation” (T/Ac) is set initially to the Minimum Green. n T/Ac is extended by 2 vehicle calls each adding 1” of Added Initial to the T/Ac timer. n Time Before Reduction (TBR), Cars Before Reduction (CBR) n After the TBR or CBR delay expires, the initial Gap,extension will be reduced to the Min Gap value over the Time to Reduce (TTR) period specified. The n The Dynamic Max Limit and Max1 or Max2 provide an upper and lower limit to the phase max time. If a phase gaps out twice in succession, the max time will be reduced by the dynamic step value until the max time reaches the lower limit. If a phase maxesout twice in a row, the max time will increase by the dynamic step value until the upper limit is reached. A gap-out followed by a max-out condition, will not effect the max time. 行人感应模式 （ Pedestrian Actuated Mode） n 工作原理 n A phase may be serviced by a pedestrian call (push- button) with or without a vehicle call on the same phase. Vehicle displays always time concurrently with the pedestrian displays of the phase. n If a pedestrian call is being serviced and no vehicle calls are present to extend phase green, then the pedestrian clearance interval will end at the onset of yellow prior to servicing a conflicting phase n Pedclr-Thru-Yellow n Rest-In-Walk n Green Delay and Ped Delay 相位基本参数 Ring, sequence, and concurrency n 环（ Ring） n 最多四个环 n 一个环中最多 16个相位。 STD-8 n Signal Phasing Signal phasing is largely dependent on the treatment of left turn movements. n protected left-turnsleft turn has exclusive right-of- way, no conflict with through movement, or n permissive (permitted) left turnsleft turns are made in the presence of conflicting trac (finding gaps), need to find sufficient gap to make a turn, potential conflict. Use dashed lines for permissive left turns. n STD8 requires that: n 1-2-3-4 operate in ring 1 n 5-6-7-8 operate in ring 2 n 1-2 are concurrent with 5-6 n 3-4 are concurrent with 7-8 n thick lines act as barriers which can only be moved left or right altogether, but one can slide thin lines in row 1 or row 2 to left or right independently. Different sliding will generate different phasing sequences. STD8例 1 2相位 STD8例 2 4相位 STD8例 2 4相位 STD8的相位顺序 例子：感应控制在 STD8上的应用 n Call phase VS extend phase n Pass barrier VS not Pass barrier. n It is important to note that a phase cannot cross a barrier until the phases in the other ring are also ready to cross the barrier. 用户模式 n 最多四个环 n 一个环中最多 16个相位。 Overlap n 定义 n Overlaps are customized channel outputs (red-yellow-green indication) driven by one or more included phases that are typically defined by consecutive included phases in the same ring as shown below. n 几个相位组合的组合。 Overlap例子 Overlap的参数 n Included phases n Modifier phases Overlap Type: Normal n 工作原理 n The overlap is green when an included phase is green, or an included phase is timing yellow/red clearance and an included phase is next n The overlap is yellow when an included phase is yellow and an included phase is not next n The overlap is red when the overlap green and yellow are not on n The overlap is dark (all outputs off) when a modifier phase is on during its green, yellow or all-red interval Overlap Type: Left Turn Permissive n 工作原理 n overlap turns green when an included phase, that is not a modifier phase, turns green (this is true even if a modifier phase is already displaying a green indication). n The overlap remains green as long as one of the included phases remain green. n The overlap is yellow when an included phase is yellow and an included phase is not on or next. n The overlap is red