【正文】 ot be unstable the question which brings. This article in has analyzed in the traffic control domestic present situation foundation, explained the key job which present paper39。 課題設(shè)計(jì)的相關(guān)技術(shù)的現(xiàn)狀 ................................................................................... 1 本文的主要工作 ....................................................................................................... 2 2 十字路口信號燈控制的基本理論和方法 .......................................................................... 3 車輛的存在與通過的檢測 ....................................................................................... 3 感應(yīng)線圈 ......................................................................................................... 3 傳感器的鋪設(shè) ................................................................................................. 3 課題選用的 PLC 介紹 .............................................................................................. 4 硬件特點(diǎn) ......................................................................................................... 5 編程軟件與接口電纜 ..................................................................................... 6 交通燈控制方式 ....................................................................................................... 7 控制系統(tǒng)的組成 ............................................................................................. 7 車流量的計(jì)量 ............................................................................................... 9 交通信號的控制方式 ................................................................................... 9 3 交通信號燈的模糊控制 .................................................................................................... 13 控制理論的發(fā)展與模糊控制理論的提出 ............................................................. 13 概念 ............................................................................................................... 13 變量選擇與論域分割 ..................................................... 錯誤 !未定義書簽。 模糊規(guī)則的設(shè)計(jì) ............................................................. 錯誤 !未定義書簽。 交通信號燈控制策略 ............................................................................................. 20 5 結(jié)論與展望 ........................................................................................................................ 23 致 謝 ................................................................................................................................ 25 參考文獻(xiàn) ................................................................................................................................ 27 附 錄 ................................................................................................................................ 29 聲明 CONTENTS VII CONTENTS 1 Preface ................................................................................................................................. 1 Topic background and significance ................................................................................. 1 Topic design correlation technique present situation ...................................................... 1 This article prime task ..................................................................................................... 2 2 The intersection signal light controls elementary theory and method................................. 3 Vehicles39。 fuzzy control.......................................................................... 13 Control theory development and fuzzy control theory statement ................................. 13 Concept................................................................................................................... 13 Variable choice and universe of discourse division................................................ 14 Fuzzy control rule................................................................................................... 14 Fuzzy method choice and determination ....................................................................... 15 Street intersection number of vehicles fuzzy.......................................................... 15 Fuzzy rule design.................................................................................................... 16 The fuzzy reasoning algorithm and the solution are fuzzy..................................... 16 4 Realizes based on the PLC fuzzy control system39。而城鎮(zhèn)道路建設(shè)和交通管理相對滯后， 人車爭路、 道路擁擠、阻塞現(xiàn)象、交通事故等時常發(fā)生。 課題設(shè)計(jì)的相關(guān)技術(shù)的現(xiàn)狀 城市交通控制系統(tǒng)是用于城市交通數(shù)據(jù)監(jiān)測、交通信號燈控制與交通疏導(dǎo)的計(jì)算機(jī)綜合管理系統(tǒng)。 通常是事先經(jīng)過交通流量的調(diào)查，運(yùn)用統(tǒng)計(jì)的方法將兩個方向紅綠燈的延時預(yù)先設(shè)置好。 智能控制交通系統(tǒng)是目前研究的方向，也已經(jīng)取得不少成果，在少數(shù)幾個先進(jìn)國家已采用智能方式來控制交通信號，其中主要運(yùn)用 GPS 全球定位系統(tǒng)等。 采用 PLC 是基于以下四個原因： 1） PLC 具有很高的可靠性，通常的平均無故障時間都在 30 萬小時以上； 2）編程能力強(qiáng)，可以將模糊化、模糊決策和解模糊都方便地用軟件來實(shí)現(xiàn)；