德(de)國(guo)E+H空(kong)氣(qi)流(liu)量(liang)計(ji)主(zhu)要(yao)功(gong)能及工(gong)作原理(li)
·空(kong)氣(qi)供(gong)給(gei)系(xi)統功用:供(gong)給(gei)與(yu)發(fa)動(dong)機負(fu)荷相適(shi)應(ying)的清潔空(kong)氣(qi),直接和(he)間(jian)接計量(liang)空(kong)氣(qi)質量(liang),與(yu)噴(pen)油(you)器(qi)噴出(chu)的汽(qi)油(you)形成*混(hun)合(he)氣(qi)。
翼片(pian)式空(kong)氣(qi)流(liu)量(liang)計(ji)
(1)主(zhu)要(yao)件(jian)功能(neng)
·緩沖片:緩(huan)沖室內(nei)空(kong)氣(qi)對緩(huan)沖片的阻尼(ni)作(zuo)用,使(shi)翼片(pian)轉動平穩
·旁(pang)通(tong)空(kong)氣(qi)調節螺釘:調節怠速時旁(pang)通(tong)空(kong)氣(qi)量(liang)的大(da)小,從而(er)調節怠速混(hun)合(he)氣(qi)的成分(fen)
·電位計(ji):將翼片(pian)轉動的角度(du)轉換為(wei)電信(xin)號
(2)工(gong)作(zuo)原理(li)
·翼片(pian)全關(guan)時(shi),沒(mei)有進氣(qi)量(liang),產(chan)生(sheng)電壓(ya)信號zui強
·翼片(pian)打開(kai)時(shi),進(jin)氣(qi)量(liang)由小變大(da),產(chan)生(sheng)電壓(ya)信號有(you)強變(bian)弱
·翼片(pian)全開(kai)時(shi),進氣(qi)量(liang)zui大(da),產(chan)生(sheng)電壓(ya)信號zui弱
(3)控(kong)制電(dian)路(lu)
·下(xia)圖(tu)為(wei)早期(qi)淩誌ES300發動機翼片(pian)式空(kong)氣(qi)流(liu)量(liang)計(ji),集成有(you)三(san)個(ge)元(yuan)件(jian)
·空(kong)氣(qi)流(liu)量(liang)計(ji):VC(電源)、VS(空(kong)氣(qi)流(liu)量(liang)信(xin)號)、E2(接地)
·進(jin)氣(qi)溫(wen)度(du)傳(chuan)感器(qi):THA(溫度(du)信號)、E1(接地)
真(zhen)空(kong)膜盒(he)型
(1)結構(gou)
·歧(qi)管(guan)真空(kong)度(du)低(di)
·歧管(guan)真空(kong)度(du)高(gao)
(2)工(gong)作原理(li)
·電(dian)感(gan)式傳(chuan)感器(qi)(線性(xing)變(bian)化(hua)壓(ya)差(cha)變(bian)壓(ya)器(qi)):進氣(qi)歧(qi)管(guan)壓力變化→鐵芯移動→輸出(chu)信(xin)號電(dian)壓(ya)變化(hua)→輸送(song)給(gei)發(fa)動(dong)機
)特點(dian)
·怠速時,節氣(qi)門(men)*關(guan)閉(bi),怠速進氣(qi)量(liang)由怠速控(kong)制閥(fa)控(kong)制的旁(pang)通(tong)空(kong)氣(qi)道提供
)怠速控(kong)制閥(fa)的類(lei)型
·步進(jin)電(dian)機型
·旋轉電磁閥型
·占空(kong)比(bi)控(kong)制電(dian)磁閥型
·開關(guan)控(kong)制電(dian)磁閥型
(2)節氣(qi)門(men)直動(dong)式
·怠速進氣(qi)量(liang)由節氣(qi)門(men)較(jiao)小的開度(du)提供,不(bu)設(she)旁(pang)通(tong)空(kong)氣(qi)道。節氣(qi)門(men)在(zai)怠速狀(zhuang)態(tai)的開度(du)大(da)小由發(fa)動(dong)機ECU通過(guo)怠速電機控(kong)制
步(bu)進(jin)電機型怠速控(kong)制閥(fa)
(1)組成(cheng)
(2)步(bu)進工(gong)作原理(li)
·定(ding)子(zi)相線(xian)按(an)1-2-3-4順(shun)序(xu)搭(da)鐵,定子(zi)N極逆時(shi)針移動(dong),轉子(zi)逆時(shi)針步進(jin)
·定(ding)子(zi)相線(xian)按(an)1-4-3-2順(shun)序(xu)搭(da)鐵,定子(zi)N極順(shun)時針移動(dong),轉子(zi)順(shun)時針步進(jin)
·轉子(zi)轉動壹(yi)圈(quan)分(fen)為(wei)4個(ge)步(bu)級進行(xing),每(mei)級(ji)步(bu)進(jin)90°
(3)工(gong)作過(guo)程
·轉子(zi)八對磁極
·定子(zi)A、B各16個(ge)爪(zhao)極,定子(zi)線圈(quan)A的兩組線(xian)圈(quan)與(yu)定(ding)子(zi)線圈(quan)B的兩組線(xian)圈(quan)反(fan)極性(xing),定(ding)子(zi)共分(fen)為(wei)32個(ge)磁極爪
·步(bu)進壹(yi)個(ge)爪(zhao)極轉角11.25°,步進32步轉子(zi)轉壹(yi)圈(quan),豐(feng)田(tian)車(che)系(xi)步(bu)進(jin)電機0~125步
(4)定子(zi)繞組控(kong)制電(dian)路(lu)
·定子(zi)輸入脈沖:
(5)步進(jin)電(dian)機怠速控(kong)制閥(fa)控(kong)制電(dian)路(lu)
占空(kong)比(bi)控(kong)制電(dian)磁閥型
(1)工作(zuo)原理(li)
·是(shi)壹(yi)個(ge)比(bi)例(li)電磁閥:占空(kong)比(bi)大(da),驅(qu)動電流大(da),電(dian)磁吸(xi)力大(da),怠速控(kong)制閥(fa)開(kai)度(du)大(da)
(2)占空(kong)比(bi)控(kong)制電(dian)磁閥型怠速控(kong)制閥(fa)控(kong)制電(dian)路(lu)
·提高(gao)冷(leng)起動怠速,加快(kuai)暖機預熱(re)過(guo)程,增(zeng)加暖(nuan)機過(guo)程中(zhong)所需(xu)的空(kong)氣(qi)量(liang),也(ye)稱(cheng)高(gao)怠速控(kong)制
·發(fa)動(dong)機完成暖(nuan)機後(hou),通(tong)過(guo)輔(fu)助(zhu)空(kong)氣(qi)閥(fa)的空(kong)氣(qi)被(bei)自動切(qie)斷,恢復正(zheng)常怠速
·現代發(fa)動機集中(zhong)管(guan)理系(xi)統,高(gao)怠速控(kong)制由怠速控(kong)制閥(fa)完(wan)成
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