一、點火器組成部分

點火器的組成主要由電源、點火線圈、分電器、點火開關、火花塞、附加(jia)電阻及其(qi)短(duan)接裝置(zhi)、高低壓(ya)導(dao)線等(deng)組成。

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1、電源：由(you)蓄電池和發(fa)電機(ji)(ji)組成(cheng)。啟動(dong)時(shi)，點火(huo)系由(you)蓄電池提供(gong)低壓(ya)電能(neng)；啟動(dong)后，當發(fa)電機(ji)(ji)電壓(ya)高于蓄電池電壓(ya)時(shi)，點火(huo)系由(you)發(fa)電機(ji)(ji)提供(gong)低壓(ya)電能(neng)。

2、點火(huo)線(xian)圈：將汽車電(dian)(dian)源提(ti)供(gong)的(de)12V低(di)壓(ya)電(dian)(dian)轉(zhuan)變成能擊穿(chuan)火(huo)花塞電(dian)(dian)極間隙(xi)的(de)高壓(ya)電(dian)(dian)。

3、分電(dian)(dian)器(qi)：在發電(dian)(dian)機(ji)凸輪軸驅動下，準時接通(tong)和(he)切斷點(dian)火(huo)(huo)線(xian)圈初級電(dian)(dian)流(liu)，使點(dian)火(huo)(huo)線(xian)圈及時產(chan)生(sheng)高(gao)(gao)壓(ya)(ya)電(dian)(dian)，并按點(dian)火(huo)(huo)順序將高(gao)(gao)壓(ya)(ya)電(dian)(dian)傳(chuan)送至各(ge)缸(gang)火(huo)(huo)花塞；同時能(neng)自動和(he)人為(wei)地(di)實現對點(dian)火(huo)(huo)時間的(de)調整。其中(zhong)電(dian)(dian)容(rong)器(qi)的(de)作用是(shi)減小斷電(dian)(dian)器(qi)觸點(dian)火(huo)(huo)花，提高(gao)(gao)點(dian)火(huo)(huo)線(xian)圈次級電(dian)(dian)壓(ya)(ya)。

4、點(dian)火開關：控制點(dian)火系低壓電路的通(tong)斷，控制發電機的啟動和熄(xi)火。

5、火(huo)花塞：將(jiang)高壓電引入燃燒室(shi)，產(chan)生(sheng)電火(huo)花點燃混合氣。

6、附加電(dian)阻(zu)短接裝置(zhi)：起動時將附加電(dian)阻(zu)短接，增(zeng)大點火(huo)線(xian)圈初級電(dian)流，增(zeng)強(qiang)起動時火(huo)花塞的跳火(huo)能量(liang)。

二、點火器的種類

1、電子式脈沖(chong)式點(dian)(dian)(dian)(dian)火(huo)器(qi)(qi)：脈沖(chong)式因(yin)功率(lv)小所以點(dian)(dian)(dian)(dian)火(huo)的能量小，產(chan)生的火(huo)花溫度低，對有(you)(you)部分燃(ran)點(dian)(dian)(dian)(dian)高可遴(lin)性氣體和濃(nong)度較低的混合(he)氣體，有(you)(you)鼓風的燃(ran)燒器(qi)(qi)點(dian)(dian)(dian)(dian)火(huo)時點(dian)(dian)(dian)(dian)燃(ran)率(lv)較低，經常(chang)會出現點(dian)(dian)(dian)(dian)不著或爆燃(ran)等(deng)安全(quan)事故，長時間且(qie)不能連(lian)續點(dian)(dian)(dian)(dian)火(huo)容(rong)易燒壞于燃(ran)油的燃(ran)燒器(qi)(qi)。

2、電子(zi)式(shi)高(gao)頻(pin)高(gao)壓點(dian)火(huo)(huo)器：功率(lv)大(da)，點(dian)火(huo)(huo)能量高(gao)產生火(huo)(huo)花溫度高(gao)，但點(dian)火(huo)(huo)時間普遍不超5分(fen)鐘，否則容易發熱(re)，燒壞，而(er)(er)體積大(da)而(er)(er)重，安裝(zhuang)運輸難。

3、線圈矽鋼片(pian)式點(dian)(dian)火(huo)器：功率(lv)大，能(neng)量(liang)高產(chan)生火(huo)花(hua)溫度高，點(dian)(dian)火(huo)時間10分鐘左(zuo)右，否則發熱燒壞，體(ti)積(ji)較小而輕，但(dan)國產(chan)普遍質量(liang)不好被進(jin)口占領90%市場。

三、點火器質量如何鑒別

1、將點火器的(de)(de)(de)(de)接線(xian)(xian)(xian)都插接上(shang)時，先不要接電(dian)(dian)源線(xian)(xian)(xian)（交流點火器(qi)的(de)(de)(de)(de)充電(dian)(dian)端(duan)），或是預先就將(jiang)磁電(dian)(dian)機的(de)(de)(de)(de)高壓輸(shu)出線(xian)(xian)(xian)頭拔開。在確(que)定點火器(qi)的(de)(de)(de)(de)地線(xian)(xian)(xian)與車上(shang)電(dian)(dian)路(lu)的(de)(de)(de)(de)地線(xian)(xian)(xian)連接良好后，再將(jiang)高壓帽從火花塞上(shang)拔出，插一備份的(de)(de)(de)(de)火花塞搭在車體上(shang)。最后是將(jiang)摩托車上(shang)的(de)(de)(de)(de)直流電(dian)(dian)路(lu)（火線(xian)(xian)(xian)是接電(dian)(dian)瓶+極(ji)。）去連接點火器(qi)的(de)(de)(de)(de)充電(dian)(dian)端(duan)。

2、將(jiang)點(dian)火(huo)(huo)器(qi)(qi)按(an)上述連接(jie)好電(dian)(dian)路后，轉(zhuan)動磁電(dian)(dian)機使(shi)觸發傳感器(qi)(qi)給點(dian)火(huo)(huo)器(qi)(qi)送去點(dian)火(huo)(huo)信號，看火(huo)(huo)花(hua)塞是(shi)不是(shi)打(da)火(huo)(huo)。如(ru)果火(huo)(huo)花(hua)塞打(da)火(huo)(huo)，這就是(shi)直流點(dian)火(huo)(huo)器(qi)(qi)。（交流點(dian)火(huo)(huo)器(qi)(qi)的(de)充電(dian)(dian)端通常接(jie)受上百伏電(dian)(dian)壓，對電(dian)(dian)瓶的(de)12V無動于(yu)衷。）如(ru)果暫(zan)時不打(da)火(huo)(huo)，也要仔細認真地檢查原因，或(huo)是(shi)用電(dian)(dian)表測量法確定點(dian)火(huo)(huo)器(qi)(qi)性質，不可(ke)輕(qing)易誤判(pan)為交流點(dian)火(huo)(huo)器(qi)(qi)。

3、比較保險的(de)(de)辦(ban)法是(shi)使用低(di)(di)壓電(dian)(dian)(dian)源做對(dui)點(dian)(dian)火(huo)(huo)(huo)器(qi)做反復測(ce)試(shi)，多次確定不是(shi)使用低(di)(di)壓電(dian)(dian)(dian)的(de)(de)直(zhi)流(liu)(liu)點(dian)(dian)火(huo)(huo)(huo)器(qi)了(le)，才(cai)可以(yi)(yi)判定為交(jiao)流(liu)(liu)點(dian)(dian)火(huo)(huo)(huo)器(qi)。有條件的(de)(de)車友，可以(yi)(yi)使用小(xiao)(xiao)電(dian)(dian)(dian)流(liu)(liu)的(de)(de)高(gao)壓電(dian)(dian)(dian)源，如(ru)果萬一(yi)是(shi)直(zhi)流(liu)(liu)點(dian)(dian)火(huo)(huo)(huo)器(qi)，也可以(yi)(yi)因電(dian)(dian)(dian)流(liu)(liu)小(xiao)(xiao)=電(dian)(dian)(dian)壓降低(di)(di)而不傷害點(dian)(dian)火(huo)(huo)(huo)器(qi)。但(dan)小(xiao)(xiao)電(dian)(dian)(dian)流(liu)(liu)的(de)(de)高(gao)壓，還是(shi)會對(dui)交(jiao)流(liu)(liu)點(dian)(dian)火(huo)(huo)(huo)器(qi)實現充電(dian)(dian)(dian)的(de)(de)，在測(ce)試(shi)中要小(xiao)(xiao)心放(fang)電(dian)(dian)(dian)麻手(shou)。

4、對(dui)于特殊情況(kuang)，例如(ru)電(dian)感高(gao)壓(ya)包(bao)就不適合配套CDI點火器(qi)；有(you)的(de)是點火器(qi)與高(gao)壓(ya)包(bao)合并的(de)點火器(qi)，例如(ru)XH90四(si)沖(chong)一體(ti)化點火器(qi)。還有(you)的(de)是自觸(chu)發的(de)二(er)沖(chong)交流點火器(qi)，是使用磁電(dian)機高(gao)壓(ya)電(dian)源的(de)，正向充電(dian)蓄(xu)能(neng)/反向觸(chu)發放(fang)電(dian)。