控制系統(tǒng)有幾種分類方法
1、按控制原理的不同，自動控制系統(tǒng)分為開環(huán)控制系統(tǒng)和閉環(huán)控制系統(tǒng)。
開環(huán)控制系統(tǒng)
在開環(huán)控制系統(tǒng)中，系統(tǒng)輸出只受輸入的控制，控制精度和抑制干擾的特性都比較差。開環(huán)控制系統(tǒng)中，基于按時序進(jìn)行邏輯控制的稱為順序控制系統(tǒng)；由順序控制裝置、檢測元件、執(zhí)行機(jī)構(gòu)和被控工業(yè)對象所組成。主要應(yīng)用于機(jī)械、化工、物料裝卸運(yùn)輸?shù)冗^程的控制以及機(jī)械手和生產(chǎn)自動線。
閉環(huán)控制系統(tǒng)
閉環(huán)控制系統(tǒng)是建立在反饋原理基礎(chǔ)之上的，利用輸出量同期望值的偏差對系統(tǒng)進(jìn)行控制，可獲得比較好的控制性能。閉環(huán)控制系統(tǒng)又稱反饋控制系統(tǒng)。
2、按給定信號分類，自動控制系統(tǒng)可分為恒值控制系統(tǒng)、隨動控制系統(tǒng)和程序控制系統(tǒng)。
恒值控制系統(tǒng)
給定值不變，要求系統(tǒng)輸出量以一定的精度接近給定希望值的系統(tǒng)。如生產(chǎn)過程中的溫度、壓力、流量、液位高度、電動機(jī)轉(zhuǎn)速等自動控制系統(tǒng)屬于恒值系統(tǒng)。
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