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調(diào)節(jié)器

比例積分控制規(guī)律(PI調(diào)節(jié)器)

發(fā)布日期:2022-08-22 點(diǎn)擊率:96


    如圖所示,在同樣的階躍輸入作用之下,比例調(diào)節(jié)器的輸出可以立即響應(yīng),而積分調(diào)節(jié)器的輸出卻只能逐漸地變
    問(wèn)題:如果既要穩(wěn)態(tài)精度高,又要?jiǎng)討B(tài)響應(yīng)快,該怎么辦呢?
    只要把比例和積分兩種控制結(jié)合,這便是比例積分控制。
    1. PI調(diào)節(jié)器
    在模擬電子控制技術(shù)中,可用運(yùn)算放大器來(lái)實(shí)現(xiàn)PI調(diào)節(jié)器,其線路如下圖所示。



      
    3. PI調(diào)節(jié)器輸出時(shí)間特性
    ◎分析結(jié)果



    由此可見(jiàn),比例積分調(diào)節(jié)器綜合了比例控制和積分控制兩種規(guī)律的優(yōu)點(diǎn),又克服了各自的缺點(diǎn),揚(yáng)長(zhǎng)避短,互相補(bǔ)充。比例部分能迅速響應(yīng)控制作用,積分部分則最終消除穩(wěn)態(tài)偏差。因而PI調(diào)節(jié)器得到了廣泛的應(yīng)用。


       

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