汽车专业英语 教学课件 作者 宋进桂汽车专业英语课件-section 1Chapter 2-6.ppt

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1、Chapter2InternalCombustionEngine2.6GasolineElectronicFuelInjectionSystemNewWordsassembly[ə'sembli]n.组合，安装，装配，总成entrance['entrəns]n.入口（处），进入，登场deliver[di'livə]v.输送，传送，投递，交付port[pɔ:t]n.港口，机场，孔，气道subsystem['sʌbsistim]n.子系统section['sek∫ən]n.部分，片，段NewWordsdelivery[di'livəri]n.输送，传送，投递，交付receiv

2、e[ri'si:v]v.接收，得到evaluate[i'væljueit]v.估算，评价，求值indicate['indikeit]v.表明，象征，暗示coolant['ku:lənt]n.冷却液Chapter2InternalCombustionEngine2.6GasolineElectronicFuelInjectionSystemChapter2InternalCombustionEngine2.6GasolineElectronicFuelInjectionSystem2.6.1TypesofPulseFuelInjectionSystemsIntheele

3、ctronicfuelinjectionsystem,theinjectormaybeopenedandclosedbyelectricalsignals.Thisisapulsefuelinjectionsystem.Thepulseinjectionsystemisusuallyelectronicallycontrolled.Althoughthereareanumberofdesigndifferencesbetweenvariouspulsefuelinjectionsystems,theoperatingprinciplesareverysimilar.The

4、throttlebodyinjectionsystem(Fig.2-9leftside)usesanassemblycontainingoneortwofuelinjectors.Theassemblyismountedattheentrancetotheintakemanifoldandinjectsfuelaheadofthethrottlevalve.Thesesystemsarealsocalledsingle-pointinjection（SPI）orcentralfuelinjection.Multi-pointinjectionsystems(Fig.2-9

5、rightside),alsocalledmulti-portinjection（MPI）systems,deliverfuelattheengineintakeportsneartheintakevalves.Chapter2InternalCombustionEngine2.6GasolineElectronicFuelInjectionSystem2.6.2PulseFuelInjectionSystemComponentsThetypicalpulseinjectionsystem(Fig.2-10)canbebrokenintothreesubsystems:

6、Airinductionsystem.Thesystemconsistsofanaircleanerassembly,throttlebody,andintakemanifold(Fig.2-10).Thethrottlebodysectioncontainsthethrottlevalve,whichisopenedandclosedbythedrivertocontroltheamountofairenteringtheintakemanifold.Fueldeliverysystem.Thefueldeliverysystem(Fig.2-10）providesth

7、efuelwhichmixeswiththeair.ThemainpartsofthesystemareshowninFig.2-11andFig.2-12.Pressureisprovidedbyanelectricfuelpump.Chapter2InternalCombustionEngine2.6GasolineElectronicFuelInjectionSystemFig.2-9Single-pointinjection(left)andmulti-pointinjectionsystem(right)Chapt