【正文】 150m）傳送后不影響測量精度。該溫度一方面送LED顯示供值班人員觀察和送溫度記錄儀打印，另一方面與設定溫度值比較運算，CPU根據(jù)比較結(jié)果對相應庫房發(fā)出制冷、強制冷、停電或通電，從而開啟或關閉電磁閥，進行制冷、強制冷、停止制冷等相關操作，并根據(jù)所需功率調(diào)節(jié)壓縮機開啟的臺數(shù)，即達到了庫溫精確控制的目的，又達到了節(jié)約能源的效果。系統(tǒng)由8031單片機最小系統(tǒng)、人機對話系統(tǒng)、溫度檢測控制系統(tǒng)、執(zhí)行單元組成。本系統(tǒng)考慮到冷庫系統(tǒng)的工作環(huán)境對單片機的特殊要求，在此采用了MCS—51系列8031單片機。溫度傳感器采用對—30~+40℃線性良好的半導體集成溫度傳感器，將溫度轉(zhuǎn)換為電流，長距離傳送到兩級運算放大器，8路模擬開關4051，經(jīng)12位模數(shù)轉(zhuǎn)換器ADC7153轉(zhuǎn)換成數(shù)字信號供單片機處理控制。 the display precision of temperature: 177。關鍵詞： 單片機、 冷庫、 自動化、 改造AbstractAlong with the gradual modern industrial devejopment,in industrial production, temperature, pressure, flow and level four is the most mon process variables. Within this total, the temperature is a very important process variables. For example: in the metallurgical industry, chemical industry, power industry, machinery processing, and food processing and many other areas, the need for various furnace, heat treatment furnace, furnace and boiler temperature control. However, the use of the conventional control methods, the potential is limited, to meet higher performances.Using singlechip8031 to carry on automational reform for the moderate model coldstoreroom, which improves the level of controlsystem’s automation, also the precision of temperatural control,save on the resouce, enhance the quantity of product in the storeroom, boost the workcondition and decrease the labor strength of the watch.The control system of coldstoreroom singlechip, which use singlechip by way of the principal controller in the system, to measure the temperatural feedback signal, after which via A/D converser carry on tackle in singlechip, pass definite arithmetic and pare operation, make the result of singlechip’s export to control the act of the relay, thereby control the execute element to realize the drival control of the resistance valve and pressor, consequently realize the control of the coldstoreroom.The requirements of technique index of coldstoreroom singlechip are:The control range of the temperature: during cold store: 5177?！?；溫度顯示精度：177。利用單片機8031對中型冷庫進行自動化改造，使得控制系統(tǒng)自動化程度大大提高，溫度控制精確，節(jié)約了能源，提高了庫存產(chǎn)品質(zhì)量，降低了值班人員的工作強度。課程設計題目：冷庫單片機控制系統(tǒng) 學校：昆明理工大學學院：機電工程學院專業(yè)：機械工程及自動化年級：2005級學生：李亞松指導老師： 單位：昆明理工大學 姓名：馬武興 職位：講師 摘要隨著現(xiàn)代工業(yè)的逐步發(fā)展，在工業(yè)生產(chǎn)中，溫度、壓力、流量和液位是種最常見的過程變量。然而，用常規(guī)的控制方法，潛力是有限的，難以滿足較高的性能要求。℃；冷凍間：－１８177。軟件設計須能進行人機對話和結(jié)果輪流顯示?！?。 control mode: drop in temperature, quick drop in temperature, constant temperature, spontaneous rise in temperature. The design of software must could carry on personputer dialog and turn to show the result.Keywords: singlechip coldstoreroom automation reform冷庫單片機控制系統(tǒng)的設計系統(tǒng)總體設計根據(jù)所要實現(xiàn)的功能特點，本系統(tǒng)選用了MCS—51系列8031單片機，擴展一片74LS373地址鎖存器，擴8kb的EEPROM2864A?！?。以下淺析了冷庫單片機控制系統(tǒng)設計過程及實現(xiàn)方法。庫溫T經(jīng)傳感器變成電流，經(jīng)傳送轉(zhuǎn)化成電壓并放大、濾波，再經(jīng)A/D轉(zhuǎn)換、軟件濾波，得到與庫溫T相應的溫度數(shù)字信號。本設定運用MCS—51系列單片機中的8031單片機為主控制器，對冷庫的溫度進行自動化控制，最終通過軟件設計來實現(xiàn)人機對話功能，實現(xiàn)對冷庫溫度的控制。由于模擬開關有一定的內(nèi)阻，而溫度傳感器的溫度電壓非常小，如先經(jīng)過模擬開關再