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(dian)阻及其短接裝置、高低壓導線(xian)等組成。
1、電(dian)(dian)(dian)(dian)源(yuan):由蓄(xu)電(dian)(dian)(dian)(dian)池(chi)(chi)和發電(dian)(dian)(dian)(dian)機組成。啟動時(shi),點火(huo)系由蓄(xu)電(dian)(dian)(dian)(dian)池(chi)(chi)提供(gong)低壓(ya)電(dian)(dian)(dian)(dian)能;啟動后,當發電(dian)(dian)(dian)(dian)機電(dian)(dian)(dian)(dian)壓(ya)高于蓄(xu)電(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)壓(ya)時(shi),點火(huo)系由發電(dian)(dian)(dian)(dian)機提供(gong)低壓(ya)電(dian)(dian)(dian)(dian)能。
2、點火(huo)線圈(quan):將汽車電(dian)源(yuan)提供的12V低壓(ya)電(dian)轉變成能擊穿火(huo)花塞電(dian)極間隙的高(gao)壓(ya)電(dian)。
3、分電器:在(zai)發電機凸輪軸(zhou)驅(qu)動下,準時(shi)接通和切(qie)斷(duan)點(dian)火線圈(quan)初級電流,使點(dian)火線圈(quan)及時(shi)產生高(gao)壓(ya)電,并按(an)點(dian)火順序將高(gao)壓(ya)電傳送至(zhi)各缸火花塞(sai);同時(shi)能自動和人為(wei)地實(shi)現對點(dian)火時(shi)間的(de)調整。其(qi)中電容器的(de)作用是減小斷(duan)電器觸點(dian)火花,提高(gao)點(dian)火線圈(quan)次級電壓(ya)。
4、點火開關:控(kong)制點火系低壓電路(lu)的通(tong)斷,控(kong)制發電機的啟(qi)動和熄火。
5、火花塞:將高(gao)壓電引入(ru)燃燒室,產生電火花點(dian)燃混(hun)合(he)氣(qi)。
6、附加電阻(zu)短接裝置:起動時(shi)將附加電阻(zu)短接,增大(da)點火(huo)線圈初級電流(liu),增強起動時(shi)火(huo)花(hua)塞的跳(tiao)火(huo)能量。
二、點火器的種類
1、電子式脈(mo)沖(chong)式點(dian)(dian)(dian)火(huo)器:脈(mo)沖(chong)式因(yin)功率小所以點(dian)(dian)(dian)火(huo)的(de)能量小,產生的(de)火(huo)花溫(wen)度低(di)(di),對有(you)部(bu)分(fen)燃(ran)點(dian)(dian)(dian)高可遴性(xing)氣(qi)體和濃(nong)度較(jiao)低(di)(di)的(de)混合氣(qi)體,有(you)鼓風(feng)的(de)燃(ran)燒器點(dian)(dian)(dian)火(huo)時點(dian)(dian)(dian)燃(ran)率較(jiao)低(di)(di),經常會出(chu)現點(dian)(dian)(dian)不(bu)著或爆燃(ran)等安全事(shi)故,長時間且不(bu)能連續點(dian)(dian)(dian)火(huo)容易(yi)燒壞于燃(ran)油的(de)燃(ran)燒器。
2、電子式高頻(pin)高壓點(dian)火器:功率(lv)大,點(dian)火能量高產生火花溫(wen)度高,但(dan)點(dian)火時(shi)間普(pu)遍不超5分(fen)鐘,否則容(rong)易發(fa)熱,燒壞,而體積(ji)大而重,安(an)裝運輸難(nan)。
3、線(xian)圈矽鋼片式點(dian)火(huo)器:功率大,能量高(gao)產生火(huo)花溫(wen)度(du)高(gao),點(dian)火(huo)時間(jian)10分鐘左右,否則(ze)發熱燒(shao)壞(huai),體積較小而輕,但國(guo)產普遍質(zhi)量不好被進口占(zhan)領90%市場。
三、點火器質量如何鑒別
1、將點火器的(de)(de)(de)接(jie)線(xian)(xian)都插(cha)接(jie)上(shang)時,先不要接(jie)電(dian)(dian)(dian)源(yuan)線(xian)(xian)(交(jiao)流(liu)點(dian)(dian)火器的(de)(de)(de)充電(dian)(dian)(dian)端),或是(shi)預先就(jiu)將磁(ci)電(dian)(dian)(dian)機的(de)(de)(de)高壓輸出線(xian)(xian)頭拔(ba)開。在確定點(dian)(dian)火器的(de)(de)(de)地線(xian)(xian)與車(che)(che)上(shang)電(dian)(dian)(dian)路(lu)的(de)(de)(de)地線(xian)(xian)連接(jie)良好后,再(zai)將高壓帽從(cong)火花(hua)塞上(shang)拔(ba)出,插(cha)一(yi)備份的(de)(de)(de)火花(hua)塞搭在車(che)(che)體上(shang)。最后是(shi)將摩托(tuo)車(che)(che)上(shang)的(de)(de)(de)直流(liu)電(dian)(dian)(dian)路(lu)(火線(xian)(xian)是(shi)接(jie)電(dian)(dian)(dian)瓶(ping)+極(ji)。)去連接(jie)點(dian)(dian)火器的(de)(de)(de)充電(dian)(dian)(dian)端。
2、將點火(huo)(huo)(huo)器(qi)按上述連接好電(dian)路后,轉動(dong)磁電(dian)機使觸(chu)發傳感器(qi)給點火(huo)(huo)(huo)器(qi)送(song)去(qu)點火(huo)(huo)(huo)信號,看(kan)火(huo)(huo)(huo)花塞是(shi)(shi)不(bu)是(shi)(shi)打火(huo)(huo)(huo)。如(ru)果火(huo)(huo)(huo)花塞打火(huo)(huo)(huo),這就(jiu)是(shi)(shi)直流(liu)點火(huo)(huo)(huo)器(qi)。(交流(liu)點火(huo)(huo)(huo)器(qi)的充電(dian)端通常接受上百伏電(dian)壓,對(dui)電(dian)瓶的12V無動(dong)于衷(zhong)。)如(ru)果暫時不(bu)打火(huo)(huo)(huo),也(ye)要仔(zi)細認真地檢查(cha)原因(yin),或是(shi)(shi)用電(dian)表測量法確定點火(huo)(huo)(huo)器(qi)性(xing)質(zhi),不(bu)可輕易誤(wu)判為交流(liu)點火(huo)(huo)(huo)器(qi)。
3、比(bi)較保險的(de)(de)辦法是使用低壓電(dian)源(yuan)做對點(dian)火器(qi)(qi)做反復測試,多次確定不(bu)是使用低壓電(dian)的(de)(de)直流(liu)點(dian)火器(qi)(qi)了(le),才可(ke)以判定為交(jiao)流(liu)點(dian)火器(qi)(qi)。有條件的(de)(de)車友,可(ke)以使用小電(dian)流(liu)的(de)(de)高壓電(dian)源(yuan),如果萬一是直流(liu)點(dian)火器(qi)(qi),也可(ke)以因電(dian)流(liu)小=電(dian)壓降低而不(bu)傷(shang)害點(dian)火器(qi)(qi)。但小電(dian)流(liu)的(de)(de)高壓,還是會對交(jiao)流(liu)點(dian)火器(qi)(qi)實(shi)現充(chong)電(dian)的(de)(de),在測試中(zhong)要小心(xin)放電(dian)麻手。
4、對(dui)于特殊情(qing)況,例如電(dian)感高壓包(bao)就不(bu)適合配套(tao)CDI點(dian)火(huo)器(qi)(qi);有的(de)是(shi)點(dian)火(huo)器(qi)(qi)與高壓包(bao)合并的(de)點(dian)火(huo)器(qi)(qi),例如XH90四(si)沖一體化點(dian)火(huo)器(qi)(qi)。還(huan)有的(de)是(shi)自觸發的(de)二沖交流(liu)點(dian)火(huo)器(qi)(qi),是(shi)使(shi)用(yong)磁電(dian)機高壓電(dian)源的(de),正向(xiang)充(chong)電(dian)蓄(xu)能/反向(xiang)觸發放電(dian)。
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