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氣動(dòng)控制系統(tǒng)中使用動(dòng)作頻率較低的開關(guān)式（ON-OFF）的換向閥來控制氣路的通斷。靠減壓閥來調(diào)節(jié)所需要的壓力，靠節(jié)流閥來調(diào)節(jié)所需要的流量。這種傳統(tǒng)的氣動(dòng)控制系統(tǒng)要想要有多個(gè)輸出力和多個(gè)運(yùn)動(dòng)速度，就需要多個(gè)減壓閥、節(jié)流閥及換向閥。這樣，不僅元件需要多，成本高，構(gòu)成系統(tǒng)復(fù)雜，且許多元件都需要預(yù)先進(jìn)行人工調(diào)節(jié)。而電氣比例閥控制屬于連續(xù)控制，其特點(diǎn)是輸出量隨輸入量（電流值或電壓值）的變化而變化，輸出量與輸入量之間存在一定的比例關(guān)系。比例控制有開環(huán)控制和閉環(huán)控制之分。閉環(huán)控制有信號(hào)的反饋系統(tǒng)。
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