教学课件·汽车专业英语(第二版)1.ppt

1、Automobile Professional English汽车专业英语汽车专业英语SVocabulary StudySTranslation SkillsSExercisesChapter One EngineUnit 1Unit 1 Engine Mechanical Engine MechanicalUnit 2 Unit 2 EFI System EFI System Unit 3Unit 3 Engine Cooling and Lubrication Engine Cooling and Lubrication System System Unit 4Unit 4 Engine

2、Ignition,Starting and Engine Ignition,Starting and Charging System Charging System Unit 5Unit 5 Engine Diagnosis System Engine Diagnosis System Unit 1 Unit 1 Engine Mechanical Engine Mechanical 1.Cylinder Block1.Cylinder Block The The engine blockengine block is the main supporting is the main suppo

3、rting structure to which all other engine parts are structure to which all other engine parts are attached.Fig.1-1-1 shows a attached.Fig.1-1-1 shows a cylindercylinder block.block.It has two main sections:the cylinder It has two main sections:the cylinder section and the section and the crankcasecr

4、ankcase section.The section.The crankcase section is used to crankcase section is used to househouse the the crankshaftcrankshaft,oiloil pan.pan.Cooling passageways are Cooling passageways are built within the block.These passageways,built within the block.These passageways,also known as also known

5、as water socketswater sockets,surround the,surround the cylinders.They allow cylinders.They allow coolantcoolant to circulate to circulate throughout the cylinder area to keep the throughout the cylinder area to keep the engine cool.There is also a drilled engine cool.There is also a drilled passage

6、way within some blocks for the passageway within some blocks for the camshaftcamshaft.Many oil holes are drilled.Many oil holes are drilled internallyinternally so that engine parts can be so that engine parts can be adequatelyadequately lubricatedlubricated.engine engine 发动机发动机 block block 气缸体气缸体cy

7、linder cylinder 气缸气缸crankcase crankcase 曲轴箱曲轴箱house house 安装安装crankshaft crankshaft 曲轴曲轴camshaft camshaft 凸轮轴凸轮轴coolant coolant 冷却液冷却液oil pan oil pan 机油盘机油盘water socket water socket 水套水套internally internally 内部地内部地adequatelyadequately 充分地充分地lubricate lubricate 润滑润滑 Four-Cylinder Engine Cylinder Bloc

8、k Four-Cylinder Engine Cylinder Block (四缸发动机气缸体四缸发动机气缸体)Fig.1-1-1Fig.1-1-1 1-cylinder block 1-cylinder block (气缸体气缸体)2-cylinder 2-cylinder (气缸气缸)3-crankcase area 3-crankcase area （曲轴箱部分）（曲轴箱部分）2.Cylinder Liners2.Cylinder LinersThe purpose of using a The purpose of using a linerliner is that,if is th

9、at,if the cylinder is damaged,the liner can be the cylinder is damaged,the liner can be removeremoved and d and replacereplaced rather easily.There d rather easily.There are two types of sleevesare two types of sleeveswet and dry.wet and dry.SealSeals must be used on the top and bottom s must be use

10、d on the top and bottom of the wet sleeve in order to keep the of the wet sleeve in order to keep the coolant from coolant from leakleaking out of the cooling ing out of the cooling system.system.3.Cylinder Head3.Cylinder HeadThe Cylinder head is used to hold the The Cylinder head is used to hold th

11、e valvevalves,and it has s,and it has portports to allow air,s to allow air,fuel and fuel and exhaustexhaust to move through the to move through the engine.engine.In additionIn addition,it has coolant,it has coolant passages.Fig.1-1-2 shows a cylinder head.passages.Fig.1-1-2 shows a cylinder head.Af

12、ter the cylinder head has been cast,After the cylinder head has been cast,some areas must be machined so that some areas must be machined so that intakeintake and exhaust and exhaust manifoldmanifolds can be s can be attached,valves can be seated,attached,valves can be seated,sparkspark plugplugs an

13、d s and injectorinjectors can be s can be installinstalled,and ed,and a good seal can be provided to the block.a good seal can be provided to the block.linerliner（发动机)气缸套remove remove 拆下replace replace 取代seal seal 密封，封条leak leak 使渗漏valve valve 气门；阀port port 孔管道exhaust exhaust 排气in addition in additi

14、on 另外intake intake 进气，吸入manifold manifold 歧管spark spark 火花plug plug 塞子injector injector 喷油器install install 安装 Cylinder HeadCylinder Head（气缸盖）（气缸盖）Fig.1-1-2Fig.1-1-21-cap(1-cap(盖盖)2-cylinder head)2-cylinder head boltbolt（气缸盖螺栓）（气缸盖螺栓）3-exhaust manifold gasket3-exhaust manifold gasket（排气歧管垫）（排气歧管垫）4-c

15、ylinder head gasket4-cylinder head gasket（气缸（气缸盖垫片）盖垫片）5-intake manifold 5-intake manifold gasket(gasket(进气歧管垫进气歧管垫)6-cylinder head(6-cylinder head(气缸盖气缸盖)7-cylinder head cover gasket 7-cylinder head cover gasket (气缸盖罩垫片气缸盖罩垫片)8-cylinder)8-cylinder head cover(head cover(气缸盖罩）气缸盖罩）4.Piston and Connec

16、ting Rod Assembly4.Piston and Connecting Rod AssemblyThe The pistonpiston and and connecting rodconnecting rod assembly assembly transmits the power from transmits the power from combustioncombustion to to the crankshaft.Shown in Fig.1-1-3,it the crankshaft.Shown in Fig.1-1-3,it mainlymainly consist

17、s ofconsists of piston,piston,compressioncompression rings,rings,oil control rings,piston oil control rings,piston pin pin and and connecting rod.(1)piston:Piston connecting rod.(1)piston:Piston fitfits s closelyclosely within the engine cylinder or within the engine cylinder or liner and is able to

18、 move liner and is able to move alternatelyalternately up up and downand down in the cylinder.(2)piston rings:in the cylinder.(2)piston rings:There are two types of piston ringsThere are two types of piston rings：compression and oil control rings.The compression and oil control rings.The compression

19、 ringscompression rings are used to seal the are used to seal the pressures of compression and power.The pressures of compression and power.The oil control rings are employed to oil control rings are employed to scrapescrape oil from the cylinder walls.(3)oil from the cylinder walls.(3)piston piston

20、 pinpin:It is used to connect piston to:It is used to connect piston to connecting rod.(4)connecting rod:it is connecting rod.(4)connecting rod:it is used to connect piston to crankshaft and used to connect piston to crankshaft and changes the changes the reciprocatingreciprocating motionmotion to t

21、he to the rotaryrotary motion.motion.piston piston 活塞connecting rod connecting rod 连杆combustion combustion 燃烧consists ofconsists of 由.组成compression compression 压缩pin pin 销fit fit 使配合closely closely 紧密地alternately alternately 交替地up and down up and down 上上下下compression ring compression ring 气环scrape s

22、crape 把.刮除piston pinpiston pin 活塞销reciprocating motionreciprocating motion 往复运动rotary rotary 旋转的 Piston and Rod Assembly Piston and Rod Assembly （活塞和连杆总成）（活塞和连杆总成）Fig.1-1-3Fig.1-1-3 1-piston(1-piston(活塞活塞)2-piston rings(2-piston rings(活塞环活塞环)3-piston pin(3-piston pin(活塞销活塞销)4-connecting rod(4-connec

23、ting rod(连杆连杆)5-connecting rod bolts 5-connecting rod bolts(连杆螺栓连杆螺栓)6-connecting rod cap 6-connecting rod cap(连杆盖连杆盖)7-connecting rod 7-connecting rod bearing(bearing(连杆轴瓦连杆轴瓦)5.Crankshaft Assembly5.Crankshaft AssemblyIt is bolted to the bottom of theIt is bolted to the bottom of thecylinder block.

24、The crankshaftcylinder block.The crankshaftassembly includes the crankshaft,assembly includes the crankshaft,bearings,flywheel,bearings,flywheel,harmonicharmonicbalancerbalancer,timingtiming geargear,and front,and front and rear seals.Fig.1-1-4 shows and rear seals.Fig.1-1-4 shows crankshaft assembl

25、y.crankshaft assembly.6.Camshaft Assembly6.Camshaft AssemblyThe camshaft is driven by the The camshaft is driven by the crankshaft and used to open and crankshaft and used to open and close the valves.The camshaft close the valves.The camshaft assembly includes the camshaft,assembly includes the cam

26、shaft,camshaft timing gear,camshaft camshaft timing gear,camshaft bearing,and timing bearing,and timing chain,beltchain,belt（if usedif used）.harmonicharmonicbalancerbalancer 扭转减震器timingtiming gear gear 正时齿轮chain beltchain belt 链(条)传动带7.Valve Drive Mechanism7.Valve Drive MechanismIt is used to transf

27、er the camshaft lift It is used to transfer the camshaft lift The valve drive mechanism consists of theThe valve drive mechanism consists of thelifterlifters,the s,the pushrodpushrods and the s and the rocker armsrocker armsLifters change the rotary motion of the Lifters change the rotary motion of

28、the camshaft to reciprocating motion to open camshaft to reciprocating motion to open and close the valve.and close the valve.HydraulicHydraulic lifters lifters are used to reduce noise and control are used to reduce noise and control the valve clearance on many engines.Theythe valve clearance on ma

29、ny engines.Theyabsorb the valve train absorb the valve train clearanceclearance by using by usingoil pressure inside the lifter body.oil pressure inside the lifter body.Pushrods are used only on engines thatPushrods are used only on engines thathave the camshaft placed within the block.have the cams

30、haft placed within the block.Overhead camshafts do not need pushrods.Overhead camshafts do not need pushrods.Rocker arms are designed to change the Rocker arms are designed to change the direction of the cam direction of the cam lifting forcelifting force.lifter n.lifter n.挺柱pushrod n.pushrod n.推杆ro

31、cker armrocker arm 摇臂hydraulic hydraulic adj.adj.液压的clearance clearance n.n.间隙lifting lifting forceforce 举升力 Crankshaft AssemblyCrankshaft Assembly（曲轴总成）（曲轴总成）Fig.1-1-4Fig.1-1-4 1-front(1-front(前端前端)2-main bearing)2-main bearing（主轴颈）（主轴颈）3-connecting rod bearing 3-connecting rod bearing（连杆轴颈）（连杆轴颈）4

32、-crank4-crank（曲柄）（曲柄）5-counterweight5-counterweight（平衡重）（平衡重）6-rear flange6-rear flange（后端法兰）（后端法兰）7-camshaft assembly 7-camshaft assembly（凸轮轴总成）（凸轮轴总成）8.Valve Assembly8.Valve AssemblyThe valve assembly,shown in Fig.1-1-5,The valve assembly,shown in Fig.1-1-5,includes the valves,includes the valves,

33、valve guidesvalve guides,valvevalveseatsseats,valve springs,valve springs,spring retainersspring retainers and and seals.seals.(1)valves:The intake valves and the(1)valves:The intake valves and the exhaust valves are located within the cylinder exhaust valves are located within the cylinder head on

34、most engines today.The exhaust valves head on most engines today.The exhaust valves are usually smaller in are usually smaller in diameterdiameter than the than the intake ones,because on the exhaust stroke the intake ones,because on the exhaust stroke the gases move more easily for the pressure of

35、the gases move more easily for the pressure of the piston forcing them out.(2)valve guides:The piston forcing them out.(2)valve guides:The valve guides support the valve in the cylinder valve guides support the valve in the cylinder head.(3)valve seats:The seats provide a head.(3)valve seats:The sea

36、ts provide a surface for the intake and exhaust valves to surface for the intake and exhaust valves to seal the seal the combustion chambercombustion chamber.They are pressed.They are pressed into the cylinder head and into the cylinder head and ground ground to the to the correct angle.(4)valve spr

37、ings,correct angle.(4)valve springs,keeperkeepers and s and retainers:The valve springs keep the valves retainers:The valve springs keep the valves closed when the camshaft is not lifting the closed when the camshaft is not lifting the valves.Keepers and retainers are designed to valves.Keepers and

38、retainers are designed to keep the valve spring keep the valve spring securesecured to the valve d to the valve stemstem.valve guide valve guide 气门导管valve seatvalve seat 气门座spring spring retainer retainer 弹簧座圈diameter diameter 直径combustion combustion chamberchamber 燃烧室ground.ground.与水平面成keeper keepe

39、r 锁片secure secure 紧固stem stem 杆，柄Translation Skill(1)Translation Skill(1)科技英语翻译的标准与方法科技英语翻译的标准与方法一、翻译的标准一、翻译的标准科技英语的翻译标准可概括为科技英语的翻译标准可概括为“忠实、通顺忠实、通顺”四个字。四个字。忠实，指忠实于原文内容。忠实，指忠实于原文内容。通顺，指译文语言必须通俗易懂，符合规范。通顺，指译文语言必须通俗易懂，符合规范。例如：例如：1.The electric resistance is measured in ohms.误译：电的反抗是用欧姆测量的。误译：电的反抗是用欧姆测

40、量的。正译：电阻的测量单位是欧姆。正译：电阻的测量单位是欧姆。2.The moment the circuit is completed,a current will start flowing the coil.误译：电路被完成的片刻，一个电流将开始流向这个线误译：电路被完成的片刻，一个电流将开始流向这个线 圈。圈。正译：电路一旦接通，电流开始流向线圈。正译：电路一旦接通，电流开始流向线圈。二、翻译的方法二、翻译的方法翻译的方法一般来说有直译（翻译的方法一般来说有直译（literal translation）和异译（）和异译（free translation）两种。）两种。直译，指直译，指“

41、既忠实于原文内容，又忠实于原文的形式既忠实于原文内容，又忠实于原文的形式”的翻译。的翻译。异译，指忠实于原文的内容，但不拘泥原文的形式。异译，指忠实于原文的内容，但不拘泥原文的形式。例如：例如：Many oil holes are drilled internally so that engine parts can be adequately lubricated.直译：有许多油孔在内部被钻出，以使发动机能够被充分的直译：有许多油孔在内部被钻出，以使发动机能够被充分的 润滑。润滑。异译：发动机内部钻有许多油道，可使其得到充分的润滑。异译：发动机内部钻有许多油道，可使其得到充分的润滑。Unit

42、 2 Unit 2 EFI System EFI SystemEFI system is composed of 3 basic subEFI system is composed of 3 basic sub systems:Fuel,systems:Fuel,Air Air InductionInduction and Electronic Control Systems.An EFI and Electronic Control Systems.An EFI system is shown in Fig.1-2-1 system is shown in Fig.1-2-1 1.Elect

43、ronic Control System1.Electronic Control SystemThe Engine Electronic Control System consists of The Engine Electronic Control System consists of various sensors,switches and various sensors,switches and actuatoractuators.The various s.The various sensors detect the intake air pressure,engine speed,s

44、ensors detect the intake air pressure,engine speed,oxygenoxygen densitydensity in the exhaust gas,engine coolant in the exhaust gas,engine coolant temperature,intake air temperature and temperature,intake air temperature and atmosphericatmospheric pressure etc,and convert the information into an pre

45、ssure etc,and convert the information into an electrical signal,which is sent to the ECM.Based electrical signal,which is sent to the ECM.Based on these signals,the ECM on these signals,the ECM determinedetermines the s the injectioninjection volume(timing)and calculates the volume(timing)and calcul

46、ates the optimumoptimum ignitionignition timing for the timing for the currentcurrent conditions.conditions.The ECM not only controls the fuel injection timing,The ECM not only controls the fuel injection timing,but also the self but also the self diagnosticdiagnostic function which records function

47、 which records the the occurrenceoccurrence of a of a malfunctionmalfunction,ignition timing,ignition timing control,idle speed control and EGR control.control,idle speed control and EGR control.inductioninduction (发动机发动机)进气进气actuator actuator 执行器执行器density density 浓度浓度oxygen oxygen 化化 氧氧atmospheric

48、 atmospheric 大气大气的的determine determine 决定决定injection injection 喷射喷射optimum optimum 最适宜的最适宜的ignition ignition 点火点火current current 当前的当前的diagnostic diagnostic 诊断诊断occurrence occurrence 发生发生malfunction malfunction 故障故障 Fig.1-2-1Fig.1-2-1 A EFI System A EFI System（燃油系统）（燃油系统）1-ignition switch 2-EFImain

49、1-ignition switch 2-EFImain replay 3-vehicle speed sensor replay 3-vehicle speed sensor 4-terminal TE1 5.PNP switch 6-4-terminal TE1 5.PNP switch 6-A/C compressor 7-starter 8-A/C compressor 7-starter 8-headlight switch 9-defogger headlight switch 9-defogger switch 10-MAP sensor 11-intake switch 10-M

50、AP sensor 11-intake air temp.sensor 12-IAC valve air temp.sensor 12-IAC valve 13-throttle position sensor 13-throttle position sensor 14-engine coolant temperature 14-engine coolant temperature sensor 15-knock sensor 16-EGR sensor 15-knock sensor 16-EGR valve 17-VSV for EGR 18-valve 17-VSV for EGR 1