【正文】 氣及 PLC 控制技術(shù) 》 . 北京：機(jī)械工業(yè)出版社 ， 20xx. [17] 李建新 .《 可編程序控制器及其應(yīng)用 》 . 北京：機(jī)械工業(yè)出版社 ， 20xx [18] 陳立定，吳玉香，蘇開(kāi)才 .《電氣控制與可編程控制器》 .廣州：華南理工大學(xué)出版社 ,200l. [19] 黃繼昌 .《傳感器工作原理及應(yīng)用實(shí)例》 .北京 :人民郵電出版社 ,20xx. 4 摘 要 ： 在當(dāng)今高速發(fā)展的社會(huì)里，交通問(wèn)題成為大家關(guān)注的社會(huì)問(wèn)題，目前國(guó)內(nèi)十字路口的交通燈控制一般是定時(shí)切換控制的。系統(tǒng) 采用 PLC 實(shí)現(xiàn)正常交通的時(shí)序控制，通過(guò)傳感器 自動(dòng)獲取車(chē)輛數(shù)據(jù)， 完成對(duì)交通異常狀況的 檢測(cè)， PLC 根據(jù)取得的數(shù)據(jù)運(yùn)用一定的智能控制原則自動(dòng)調(diào)節(jié)紅綠燈的時(shí)間長(zhǎng)度 。s principle of work, the paper puts forward a simple and practical city traffic light control system hardware circuit design. The system uses PLC to realize sequential control of the normal transportation, through the sensor automatic access to vehicle data, performed on abnormal traffic detection, PLC according to the data obtained by using certain intelligent control principle of automatic adjusting light time length Compared with the traditional control of the timing of traffic lights and traffic lights control, minimize the vehicles stranded, solved the problem of traffic imbalance, instability, improved highway traffic rate, higher than the global positioning system to lower the cost, so as to make full use of the limited manpower and material resources. At the same time to reduce vehicle exhaust emissions, reduce environmental pollution has played a role should not be underestimated. Keywords: PLC control system Traffic lights Intelligent control 6 目 錄 1 引言 ........................................................................................................................... 7 交通燈的發(fā)展史 ................................................................................................. 7 我國(guó)城市交通的發(fā)展現(xiàn)狀 ................................................................................... 9 2 智能交通燈方案設(shè)計(jì) ................................................................................................. 10 系統(tǒng)構(gòu)建 .......................................................................................................... 10 智能交通信號(hào)燈正?？刂品绞? ...........................................................................11 急車(chē)強(qiáng)通控制方式 ............................................................................................ 12 ３ 智能交通燈系統(tǒng)的硬件設(shè)計(jì) ..................................................................................... 13 PLC 的用途與特 點(diǎn) ............................................................................................ 14 PLC 的用途 .............................................................................................. 14 PLC 的特點(diǎn) .............................................................................................. 15 的選型 .......................................................................................................... 15 FX2NPLC 的結(jié)構(gòu) ................................................................................... 16 PLC 的工作原理 ....................................................................................... 17 傳感器的選擇 .................................................................................................... 18 I/O 分配表 ......................................................................................................... 19 I/O 分配點(diǎn)數(shù)估算 .............................................................................................. 19 PLC 硬件電路圖 ................................................................................................ 19 4 PLC 軟件編程設(shè)計(jì) ................................................................................................... 21 程序流程圖 ...................................................................................................... 21 plc 梯形圖 ......................................................................................................... 23 程序語(yǔ)句表 ....................................................................................................... 26 5 系統(tǒng)評(píng)價(jià) ..................................................................................................................... 28 系統(tǒng)的優(yōu)點(diǎn) ....................................................................................................... 28 系統(tǒng)需改進(jìn)的地方 ............................................................................................. 28 7 總結(jié) ........................................................................................................................... 29 8 致謝 ........................................................................................................................... 30 參考文獻(xiàn) ........................................................................................................................ 31 7 1 引言 隨著我國(guó)社會(huì)經(jīng)濟(jì)的發(fā)展，城市交通問(wèn)題越來(lái)越引起人們的關(guān)注，交通問(wèn)題成為制約我國(guó)社會(huì)經(jīng)濟(jì)發(fā)展的一個(gè)大問(wèn)題，我國(guó)的人口眾多，現(xiàn)在大多數(shù)城市都經(jīng)常會(huì)出現(xiàn)交通擁堵現(xiàn)象，人、車(chē)、路三者關(guān)系的協(xié)調(diào)，已成為交通管理部門(mén)需要解決的重要問(wèn)題之一。 如何采用合適的控制方法，最大限度利用好耗費(fèi)巨資修建的城市高速道路，緩解主干道與匝道、城區(qū)同周邊地區(qū)的交通擁堵?tīng)顩r，越來(lái)越成為交通運(yùn)輸管理和城市規(guī)劃部門(mén)亟待解決的主要問(wèn)題。而且，近年來(lái)隨著科技的 飛速發(fā)展，PLC 的應(yīng)用正在不斷地走向深入，同時(shí)帶動(dòng)傳統(tǒng)控制檢測(cè)日新月益更新。 早在 1850 年，城市交叉口處不斷增長(zhǎng)的交通就引發(fā)了人們