汽车专业毕业设计-翻译-中英文(全)automobile-engine-injection-ignition--.doc
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汽车专业毕业设计-翻译-中英文(全)automobile-engine-injection-ignition--.doc

汽车专业毕业设计-翻译-中英文(全)automobile-engine-injection-ignition--.doc

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InjectionandIgnition--AutomobileEngineInjectionandIgnitionUsingtheMotorolaMPC555MicrocontrollerRickWagonerInformationEducationandTechnology645,Section001ProfessorDr.YudiGondokaryonoMay2,2006AutomobileEngineInjectionandIgnitionIntroductionAutomobileenginesandpowertrainshavebecomeamajorgrowthareaformicrocontrolleruse.Thisgrowthisalsoexpectedtocontinue.Asmanynewregulationsconcerningtheexhaustemissionsandfuelefficiencymustbemetthenmoreandmoremicrocontrollersonautomobileswillberequired.Oneareathatcurrentlymakesuseofamicrocontrolleristhatoffuelinjectionandengineignition.Thesetwoareascanbothbecontrolledinamannerthatcangreatlyincreasefuelefficiency,lowerexhaustemissions,andalsoimproveenginepowerperformance.Let’sbeginbylookingatfuelinjection.Injectingtheproperamountoffuelintotheengineatthepropertimeallowstheenginetooperateapeakperformancelevels.Thisprocesscanbeaccomplishedwithouttheuseofamicrocontroller.However,duetothemanyfactorsaffectingwhatconstitutestheproperamountandpropertimemakestheuseofamicrocontrollermuchmoreappealing.Themicrocontrollercangatherthereadingsfromsensorsconnectedtomanycomponentsontheenginetoperformcalculationsdeterminingtheproperamountandpropertimefortheinjectionprocesstooccur.Thehigherthetemperatureontheenginethebetterthefuelburns.Asthefuelburnsmoreefficientlylessfuelisrequiredtogeneratethesameamountofenergy.Havingatemperaturesensoronthemotorprovidinginputtothemicrocontrollerallowsforadjustmentoftheamountoffuelbeinginjectedintothemotortoprovidethesameamountofengineoutputenergy.Thesecalculationsarequitecomplexandthuswouldtakesometimeforapersontoperform.Themicrocontrollercangatherthedata,performthecalculations,andmakethenecessaryadjustmentsinafractionofasecond.Thegatheringandadjustmentprocesscanthusbeperformedmanytimespersecondallowforcontinuouslevelsofhigherengineperformance.Likewise,theignitionprocesscanalsobecontrolledinasimilarprocess.Ignitionneedstooccuratatimethatwillallowtheenginetoprovidethem