【正文】 .................................... 4 執(zhí)行器的選擇 ...................................................................................................... 6 本章小結(jié) ............................................................................................................... 6 第 2 章 系統(tǒng)硬件設(shè)計 ....................................................................................................... 7 鍵盤輸入電路的設(shè)計 ......................................................................................... 7 LCD1602 顯示電路的設(shè)計 ................................................................................. 7 DS1302 時鐘電路的設(shè)計 .................................................................................... 8 溫度采集電路的設(shè)計 ......................................................................................... 9 DS18B20 簡介 .......................................................................................... 9 DS18B20 電路的設(shè)計 .............................................................................. 9 水流檢測電路的設(shè)計 ....................................................................................... 10 加熱驅(qū)動電路的設(shè)計 ....................................................................................... 10 大功率光耦 MOC3042.......................................................................... 10 驅(qū)動電路的工作原理 ............................................................................ 11 驅(qū)動電路的設(shè)計 .................................................................................... 12 漏電保護技術(shù) .................................................................................................... 12 本章小結(jié) ............................................................................................................ 13 第 3 章 控制算法設(shè)計 ..................................................................................................... 14 PID 控制算法 ..................................................................................................... 14 被控對象模型的建立 ....................................................................................... 14 參數(shù)整定及 MATLAB 仿真 .............................................................................. 15 PID 參數(shù)整定 .......................................................................................... 15 II MATLAB 仿真 ........................................................................................ 16 本章小結(jié) ............................................................................................................ 17 第 4 章 系統(tǒng)軟件設(shè)計 ..................................................................................................... 18 軟件系統(tǒng)總體設(shè)計 ........................................................................................... 18 鍵盤輸入 ............................................................................................................ 19 DS18B20 測溫 .................................................................................................... 20 DS18B20 初始化 .................................................................................... 20 DS18B20 寫數(shù)據(jù) .................................................................................... 21 DS18B20 讀數(shù)據(jù) .................................................................................... 22 DS18B20 溫度讀取 ................................................................................ 22 LCD1602 顯示 .................................................................................................... 23 LCD1602 時序介紹 ................................................................................ 23 LCD1602 初始化 .................................................................................... 24 PID 算法的軟件設(shè)計 ......................................................................................... 24 PWM 輸出 .......................................................................................................... 25 本章小結(jié) ............................................................................................................ 26 第 5 章 模擬仿真與結(jié)果分析 ........................................................................................ 27 顯示模擬仿真 .................................................................................................... 27 加熱模擬仿真 .................................................................................................... 28 結(jié)果分析 ............................................................................................................ 28 第 6 章 結(jié)論 ..................................................................................................................... 29 致謝 .................................................................................................................................... 30 參考文獻 ........................................................................................................................... 31 附錄 .................................................................................................................................... 32 附錄 A 系統(tǒng)整體電路圖 ......................................................................................... 32 附錄 B 部分源程序 ................................................................................................. 33 太原科技大學(xué)畢業(yè) 設(shè)計 I 摘要 本文完成了即熱式電熱水器控制系統(tǒng)的設(shè)計。通過 PID 控制算法控制熱水器的出水溫度，利用 C 語言完成電熱水器控制系統(tǒng)的軟件設(shè)計；另外，采用“隔電墻”技術(shù)做漏電保護，保證洗浴過程中的安全。 關(guān)鍵詞 ： AT89C52，電熱水器， PID 太原科技大學(xué)畢業(yè) 設(shè)計 II ABSTRACT The design of electric water heater control system is introduced in this paper. AT89C52 was selected, which is regarded as the main controller, and bines with the keyboard module, display module, clock module, temperature acquisition module, water flow detection module and drive module to plete the hardware circuit design. The water temperature is controlled through the PID, and the software design of electric water heater control system is pleted