資源描述：
《點火系統(tǒng)畢業(yè)課程設計外文文獻翻譯、中英文翻譯、外文翻譯》由會員上傳分享，免費在線閱讀，更多相關內容在學術論文-天天文庫。
1、IgnitionSystemThepurposeoftheignitionsystemistocreateasparkthatwillignitethefuel-airmixtureinthecylinderofanengine.Itmustdothisatexactlytherightinstantanddoitattherateofuptoseveralthousandtimesperminuteforeachcylinderintheengine.Ifthetimingofthatsparkisoffbya
2、smallfractionofasecond,theenginewillrunpoorlyornotrunatall.Theignitionsystemsendsanextremelyhighvoltagetothesparkplugineachcylinderwhenthepistonisatthetopofitscompressionstroke.Thetipofeachsparkplugcontainsagapthatthevoltagemustjumpacrossinordertoreachground.
3、Thatiswherethesparkoccurs.Thevoltagethatisavailabletothesparkplugissomewherebetween20,000voltsand50,000voltsorbetter.Thejoboftheignitionsystemistoproducethathighvoltagefroma12voltsourceandgetittoeachcylinderinaspecificorder,atexactlytherighttime.Theignitionsy
4、stemhastwotaskstoperform.First,itmustcreateavoltagehighenough(20,000+)toacrossthegapofasparkplug,thuscreatingasparkstrongenoughtoignitetheair/fuelmixtureforcombustioflSecond,itmustcontrolthetimingofthatthesparksoitoccursattheexactrighttimeandsendittothecorrec
5、tcylinder.Theignitionsystemisdividedintotwosections,theprimarycircuitandthesecondarycircuit.Thelowvoltageprimarycircuitoperatesatbatteryvoltage(12to14.5volts)andisresponsibleforgeneratingthesignaltofirethesparkplugattheexactrighttimeandsendingthatsignaltothei
6、gnitioncoil.Theignitioncoilisthecomponentthatconvertsthe12voltsignalintothehigh20,000+voltcharge.Oncethevoltageissteppedup,itgoestothesecondarycircuitwhichthendirectsthechargetothecorrectsparkplugattherighttime.TheBasicsBeforewebeginthisdiscussion,let'stalkab
7、itaboutelectricityingeneral.Iknowthatthisisbasicstuff,buttherewasatimethatyoudidn^tknowaboutthisandtherearepeoplewhoneedtoknowthebasicssothattheycouldmakesenseofwhatfollows.AllautomobilesworkonDC(DirectCurrent).Thismeansthatcurrentmoveinonedirection,formthepo
8、sitivebatteryterminaltothenegativebatteryterminal.Inthecaseoftheautomobile,thenegativebatteryterminalisconnectedbyaheavycabledirectlytothebodyandtheengineblockofthevehicle.Thebodyandanyme
