汽车专业英语2-8（课堂PPT）.ppt

1Specialized English for Automobile单击此处编辑母版标题样式单击此处编辑母版副标题样式vUnit 2-8Electronic Fuel Injection SystemContentsI. Pre-questionsII. Text ExplanationIII. Exercises2vWhatistheEFIsystemconsistof?vthefueldeliverysystemvairinductionsystemvtheelectroniccontrolsystem.I. Pre-questions3vWhatisthefueldeliverysystemcomposedof?vthefueltank,fuelpump,fuelfilter,vfueldeliverypipe(fuelrail),fuelinjector,fuelpressureregulator,andfuelreturnpipe.vSomeenginesalsohavepulsationdamper.I. Pre-questions4thefueldeliverysystem输油管冷起动喷油器油压调节器喷油器油压脉动衰减器燃油滤清器油箱fueltankfuelpumppulsationdamperfuelinjectorfuelpressureregulatorFuelpressureregulatorfueldeliverypipe5vWhatdoestheairinductionsystemconsistof ?vtheaircleaner,airflowmeter,throttlevalve,airintakechamber,intakemanifoldrunner,andintakevalve. I. Pre-questions6Air supply systemAir cleanerAir flow meterthrottleECUIdle speed control valve7vHowdoesEFIsystemoperate?I. Pre-questionsFuel pressure regulatorFuel tankFuel pumpCoolant Temperature sensorThrottle position sensorECUinjectorInput pipeIntake Air Temperature Sensor Engine speed sensorAir flow sensorFilter8vTheairinductionsystemconsistsoftheaircleaner,airflowmeter,throttlevalve,airintakechamber,intakemanifoldrunner,andintakevalve.vTheairinductionsystem进气系统vairflowmeter空气流量计vthrottlevalve节气门vintakemanifold进气歧管v译文：进气系统由空气滤清器、空气流量计、节气门、空气进气室、进气歧管管道和进气门组成。

II. Text Explanation9vTheactuatorscontainsfuelpumprelay,injector,MalfunctionIndicatorLight(MIL),EVAPcanisterpurgesolenoidvalve,airconditionerrelay,coolingfanrelays,idlecontrolvalve,etc.vTheactuators执行器vfuelpumprelay燃油泵继电器vMalfunctionIndicatorLight故障指示灯II. Text Explanation10vEVAPcanisterpurgesolenoidvalvev燃油蒸发炭罐净化电磁阀vidlecontrolvalve怠速控制阀v译文：执行器包括燃油泵继电器，故障指示灯，燃油蒸发炭罐净化电磁阀，空调继电器，冷却风扇继电器，怠速控制阀等II. Text Explanation11v Whentheinjectoristurnedon,itopens,sprayingatomizedfuelatthebacksideoftheintakevalve.v atomize tmaiz v.将喷成雾状v turnedon被闭合v 译文：当喷油器线路闭合，喷口打开，将雾状的燃油喷射到进气门的后方。

II. Text Explanation12v TheECUsignalstheinjectortodeliverjustenoughfueltoachieveanidealair/fuelratioof14.7:1,oftenreferredtoasstoichiometry.v anidealair/fuelratio空燃比v referredto查阅,提到,谈到,打听v stoichiometry 7stCiki5Cmitri n.化学计量法v 译文：ECU常常参照化学计量法向喷油器发出信号输送足够的燃油以达到14.7的空燃比II. Text Explanation13vThebasicfunctionoftheECUistocontrolthepulsewidthoftheinjector.vthepulsewidth脉冲宽度v译文：发动机控制单元的基本功能是控制喷油器的脉冲宽度II. Text Explanation14v TheECUmonitorsvariablessuchascoolanttemperature,enginespeed,throttleangleandexhaustoxygencontentandmakesinjectioncorrectionswhichdeterminefinalinjectionquantity.v monitor5mCnitEv n.班长,监听器,监视器,监控器vt.监控v coolanttemperaturev 冷却液温度II. Text Explanation15vthrottle5WrCtln.节气门voxygen5CksidVEnn.氧气v译文：ECU监控的变量有冷却液温度，发动机转速，节气门开度，废气中的含氧量，根据这些，ECU可对喷射的燃油做出修正以确定最终的喷油量。

II. Text Explanation16v mass airflow sensorv throttle position sensorv intake air temperature sensorv crankshaft position sensorv exhaust gas oxygen sensorv fuel pressure regulatorv air/fuel ratiov L type EFI systemv pulsation damperv idle control valveIII. ExercisesTranslate the following expressions into Chinese. 空气流量传感器 节气门位置传感器 进气温度传感器 曲轴位置传感器 氧传感器 油压调节器 空燃比 L型电喷系统 脉动衰减器 怠速控制阀17v1- theaircleanerv2- airflowmeterv3- throttlevalvev4-idlespeedcontrolvalvev5- intakemanifoldv6-intakevalvev7- injectorv8- airintakechamberIII. Exercises18v A-cold start injector, B- pulsation damper; C-fuel filter; D-fuel tank; E-fuel pump; F- fuel pressure regulator ;G- injectorIII. Exercises19vTheengineintakeairfirstpasses through anaircleanerandisthenmeasured forquantitybyanairflowmeter.Thisincorporatesaspring-returnedrotatableflapinitsairpassage.Astheairflowsthroughthemeteritdeflectstheflap,untilaconditionofequilibriumismaintainedbetweentheairpressureandtheclosingtorqueontheflap.III. Exercises20vTheanglethroughwhichtheflapisrotatediselectronicallymonitored,sothattheEFIcontrolunitcancompute thequantityoffueltobeinjected.Astheflapoftheairflowmeterisrotatedacomplementarydamperplate,workingwithinaclose-clearanceairchamber,ensuresthattheflapisnotdisturbedbypulsationsintheintakemanifold.III. Exercises21vI.TranslatethefollowingsentencesintoChinese.v1the engine ECU calculates the optimum fuel injection volume, and causes the injectors to inject the fuel.v发动机ECU计算出最适宜的燃油喷射量，然后使喷油器喷射燃油。

v（见TextExplanation）III. Exercises22vII.TranslatethefollowingsentencesintoEnglish.v 1ECU可根据传感器信号计算最佳喷油持续期v TheECUcalculatestheoptimumfuelinjectionvolumeinaccordancewiththesignalsfromthesesensors.v 2曲轴位置传感器用于检测曲轴转角和发动机速度v Thecrankshaftpositionsensorisusedtodetectthecrankshaftangleandenginespeed.v 3发动机怠速运转所需要的空气可以来自怠速控制阀v Theairneededforaengineidlecancomefromanidlecontrolvalve.III. Exercises2324Specialized English for Automobile单击此处编辑母版标题样式单击此处编辑母版副标题样式。