【正文】 ation is the conventional PID controller and fuzzy PID controller control performance. Through the Siemens SIMATIC S7300 PLC programming system and the force control configuration software design of the Siemens PLC conventional PID systems and fuzzy PID control algorithm. Through the configuration software force charged with realtime monitoring level changes, Will design good level control system was simulated. Experiments show that the fuzzy controller has good dynamic and static control effect. Key Words: Process control, PID control, Fuzzy control, PLC, Force contro 東北大學(xué)秦皇島分校畢業(yè)設(shè)計(jì)（論文） 第 III 頁 目 錄 1 緒論 ...................................................................................................................................... 1 過程控制概述 ............................................................................................................... 1 模糊控制理論的產(chǎn)生和發(fā)展?fàn)顩r ............................................................................... 2 PLC 的特點(diǎn)及發(fā)展?fàn)顩r ............................................................................................... 3 PLC 的特點(diǎn) .......................................................................................................... 3 PLC 技術(shù)發(fā)展動(dòng)向 .............................................................................................. 5 可編程控制器的硬件組成 .................................................................................. 6 課題研究的主要內(nèi)容與論文結(jié)構(gòu) ............................................................................... 7 課題研究內(nèi)容 ...................................................................................................... 7 論文結(jié)構(gòu) .............................................................................................................. 7 2 水箱液位控制系統(tǒng)設(shè)計(jì) 及模型分析 .................................................................................. 8 水箱液位串級控制系統(tǒng)設(shè)計(jì) ....................................................................................... 8 水箱液位控制系統(tǒng)組成及工作原理 ........................................................................... 9 雙容水箱數(shù)學(xué)模型建立與分析 ................................................................................. 10 3 PID 控制和模糊控制 ......................................................................................................... 14 PID 控制 ...................................................................................................................... 14 PID 簡述 ............................................................................................................. 14 數(shù)字式 PID 控制算法 ........................................................................................ 16 模糊控制 ..................................................................................................................... 18 模糊控制器的基本結(jié)構(gòu) .................................................................................... 18 模糊集合 ............................................................................................................ 20 隸屬度函數(shù)及其確定 ........................................................................................ 22 模糊推理 ............................................................................................................ 25 液位模糊控制器的設(shè)計(jì) ............................................................................................. 25 4 系統(tǒng)硬件設(shè)計(jì) .................................................................................................................... 31 西門子 S7300PLC ..................................................................................................... 31 液位控制系統(tǒng)組成 ..................................................................................................... 32 5 PLC 編程實(shí)現(xiàn) .................................................................................................................... 35 西門子 S7300 編程基礎(chǔ) ........................................................................................... 35 東北大學(xué)秦皇島分校畢業(yè)設(shè)計(jì)（論文） 第 IV 頁 STEP 7 編程 ................................................................................................................ 37 控制算法的實(shí)現(xiàn) ......................................................................................................... 38 程序流程圖 ........................................................................................................ 39 梯形圖程序 ........................................................................................................ 40 組態(tài)軟件力控 ....................................................................................................... 43 常規(guī) PID 與模糊 PID 控制器性能比較 .................................................................... 44 用 MATLAB 模糊邏輯工具箱設(shè)計(jì)模糊控制器 .............................................. 44 SIMULINK 仿真 ................................................................................................ 46 結(jié)論 .......................................................................................................................................... 48 致 謝 .................................................................................................................................. 49 參考 文獻(xiàn) .................................................................................................................................. 50 附 錄 .................................................................................................................................. 52 東北大學(xué)秦皇島分校畢業(yè)設(shè)計(jì)（論文） 第 1 頁 1 緒論 過程控制概述 過程控制技術(shù)是利用測量儀表、 控制儀表、計(jì)算機(jī)、通信網(wǎng)絡(luò)等技術(shù)工具，自動(dòng)獲得各種變量的信息，并對影響過程狀況的變量進(jìn)行自動(dòng)調(diào)節(jié)和操作，以達(dá)到控制要求等目的的技術(shù)。根據(jù)液位系統(tǒng)的特征，選取合適的模糊控制規(guī)則和隸屬度函數(shù)，建立模糊控制規(guī)則查詢表，設(shè)計(jì) PID 控制器和模糊控制器，將設(shè)計(jì)好的 串級 系統(tǒng)在 Simulink 軟件上 進(jìn)行仿真，比較常規(guī) PID控制器和模糊 PID 控制器的控制性能。