点火系统毕业课程设计外文文献翻译、中英文翻译、外文翻译

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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