汽车专业外语04ppt课件.ppt

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1、EngineIgnitionSystemandStartingSystem发动机点火和启动系统Unit4PassageAWhat’sitsfunction?TosupplyasparkacrossthesparkplugelectrodeatthecorrecttimeunderalloperatingconditionsPassageAIgnitionSystem点火系统PassageAIgnitionSystem点火系统PassageAThreefunctionsoftheignitionsys

2、temToconvertlowvoltagedirectcurrent(DC)tohighvoltagepulsesTodirectthehighvoltagepulsestoeachsparkplugtoignitetheairfuelmixtureToproperlytimethehighvoltagepulsesforefficientengineoperationPassageAIgnitionSystem点火系统PassageATwotypesofignitionsystemConvent

3、ionalignitionsystem(CI)Electronicignitionsystem(EI)orDirectignitionsystem(DI)PassageAConventionalignitionsystem(CI)传统点火系统PassageATwobasicelectricalcircuits:Primary(Lowvoltage)circuitSecondary(Highvoltage)circuitPrimary(Lowvoltage)circuitincludes:Batter

4、y,Ignitionswitch,Resistancewire,Coilprimarywinding,Distributorcontactpoint,andConnectingwireSecondary(Highvoltage)circuitincludes:Coilsecondarywinding,Distributorcap,Distributorrotor,SparkplugsandSparkplugwiresPassageAConventionalignitionsystem(CI)传统点火

5、系统PassageABatterySourceofelectricalenergyfortheignitionsystemIsittheonlysourceofelectricalenergy?Aftertheengineisstarted,currentissuppliedbythealternatororthealternatorandbatteryworkingtogether.aant.au/Membership/BenefitsofMembership/tabid/62/Default.a

6、spxPassageAConventionalignitionsystem(CI)传统点火系统PassageAIgnitionswitchOpenandclosethecircuitbetweentheelectricalenergysourceandtheotherignitioncomponentsFourpositions:OFF(LOCK)ACCESSORYONSTARTdiymyride/starting-a-flooded-engine-1823/ignition-switch/Pass

7、ageAConventionalignitionsystem(CI)传统点火系统PassageAIgnitioncoilThevoltagedevelopedbybatteryoralternatorisnothighenoughStepup,ortransform,thelowvoltagetothe35kVormorerequiredforignitionpenguinslab/ignitioncoil.htmPassageAConventionalignitionsystem(CI)传统点火系

8、统PassageADistributorThreejobs:OpenandclosealowvoltagecircuitbetweenthesourceofelectricalenergyandtheignitioncoilbyintermittentsurgesdevelopedbyitTimethesurges,whichisaccomplishedwithcentrifugalorvacuumadvancemechanismDirectthehighvoltag