19142字
摘要
本設(shè)計(jì)是控制加熱爐的溫度保持在設(shè)定區(qū)間內(nèi)，溫度低于下限自動(dòng)加熱，溫度高于上限自動(dòng)降溫，用數(shù)字顯示加熱爐實(shí)際溫度。由數(shù)據(jù)采集電路的溫度傳感器（熱電偶），檢測加熱爐的實(shí)際溫度，經(jīng)模/數(shù)轉(zhuǎn)換后送入單片機(jī)中與設(shè)定溫度值進(jìn)行比較。控制方法采用增量型 控制方法，溫度信號經(jīng)比較后，由單片機(jī)輸出控制觸發(fā)電平，控制繼電器的開合。本設(shè)計(jì)采用數(shù)字 控制器，不但節(jié)省了硬件，而且具有控制精度高，可靠性高，操作方便，自動(dòng)化高等特點(diǎn)。

關(guān)鍵詞：數(shù)據(jù)采集 信號調(diào)理 鍵盤與顯示 輸出控制

ABSTRACT
The system in this article was designed to keep the temperature of furnace，which will heat itself automatically if the temperature is lower to the minimum and cold itself when the temperature is higher than the maximum then display the temperature，in an special area. The real temperature will be checkout through the data sample circuit and be sent after converting by A/D converter to MCU, where the data will be compared with the value defined before. The algorithm of incremental PID was adopted in this design. The on-off state of the relay is controlled by the electrical level output by the MCU after the temperature signal was compared. Because the digital PID controller was adopted in this system, the hardware circuit was cut down and it was perfect on control precise, more reliable, operated conveniently |and automatically.

Keywords: Data Acquisition Signal Conditionting Keyboard and Display Output Control

目錄
摘要 I
ABSTRACT II
前言 IV
緒論 1
1 數(shù)據(jù)采集部分 2
1.1數(shù)據(jù)采集方式 2
1.2傳感器的選用 4
2 信號調(diào)理電路的參數(shù)設(shè)計(jì)和選擇 9
2.1前置放大器 9
2.2濾波器 11
3 轉(zhuǎn)換電路的參數(shù)設(shè)計(jì)和選擇 12
3.1 A/D轉(zhuǎn)換器的選擇 12
3.2 采樣保持器 16
4 鍵盤與顯示部分設(shè)計(jì) 16
4.1 鍵盤部分 16
4.2 顯示部分 17
5 輸出控制部分設(shè)計(jì) 19
5.1 80C51單片機(jī)的引腳定義及功能 19
5.2 開關(guān)量輸出通道 21
6 軟件部分設(shè)計(jì) 23
結(jié)論 26
參考文獻(xiàn) 27
致謝 28
附錄 29

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