汽車專業(yè)英語Unit-5-PPT課件

1、Unit5Automobile electrical system汽車電氣系統(tǒng)授課教師：Lesson 1 The overview of automobile electrical system汽車電器系統(tǒng)概述Learning Objectives（學習目標）Learn about the constitution and characteristic of vehicles electrical system.Learn about the functioning of the cars electrical system.Grasp the new words and useful exp

2、ressions.Part one：Stimulate students interest（激發(fā)興趣）There are many electrical components in the car. Look at the following picture carefully and try to introduce it to your classmates.Part Two-Study Preparation（學習準備）1.New Words to learn（單詞學習）Battery btrin.電池generator den reit n. 發(fā)電機horn h:n n.喇叭illum

3、ination ilju:mnein n.照明supply splaiv.提供cooperation kupren n.合作，協(xié)作，協(xié)助，配合circuits:kt n.電路，線路;materialmtiril n.材料，原料;constitution knsttju:n n.建立，組成;summarizesmrazvt.總結(jié)，概述;categorizektgraz把歸類Phrase learning （短語學習）2.Proper Names(專有名詞)FUSE 保險絲或精熔斷器；DOME 室內(nèi)燈系統(tǒng)；STOP 停車燈系統(tǒng)；HORN 揚聲器；ST 起動機；A/C 空調(diào)系統(tǒng)；EFI 電子控制燃油

4、噴射系統(tǒng)；AIRSUS 空氣懸架系統(tǒng)；ABS 制動防抱死系統(tǒng)；Part Two-Study Preparation（學習準備）ECU 電子控制單元保險絲；POWER 電動車窗控制系統(tǒng)；CBDOOR 電動門鎖控制系統(tǒng)；FL RAD FAN 散熱器風扇；HTR 加熱器系統(tǒng)；HEADRHLWR：右前照燈近光；HEADLHLWR：左前照燈近光；HEADRHUPR：右前照燈遠光；Part Two-Study Preparation（學習準備）3.Phrase learning （短語學習）content of 內(nèi)容be the symbol of 是的象征according to 根據(jù)a variety

5、 of 大量的、各種the most important 最重要的refers to 指的是and so on 等等such as 例如be made up of 由組成transform into 將轉(zhuǎn)換成Part Two-Study Preparation（學習準備）Part Three-Text(閱讀資料)The constitution and characteristic of vehicles electrical systemAutomotive electrical system is an important part of the car, whose performanc

6、e directly affects the dynamic quality, economical efficiency, reliability, safety, and comfort and emission performance. Automotive electrical system is an important symbol of the development level of modern vehicles and, scientific and technological content of vehicles has become one of the import

7、ant indicators to measure the grade level of the modern automobiles. With the development of technology, integrated circuits and micro computers are widely used in automobiles. The number of electrical appliances is increasing, the power is increasing and the quality of products and performance are

8、improving, the structure tends to be more perfect. Its necessary that vehicle maintenance workers should understand and master the structure of materials, the identification of the spare parts and their principles, and that receive, dispatch and keep the parts correctly.Part Three-Text(閱讀資料)I .The c

9、onstitution of the vehicles electrical systemIn terms of the electrical system in modern vehicles, it can be summarized and categorized into the following four parts: （1）Power systemThe power supply system includes a battery, a generator and regulator. The first two parts are parallel. The main powe

10、r is generator and battery is an auxiliary power supply. Generator with a regulator automatically adjusts the output voltage of the generator when the generator speed increases, so that it remains stable.Part Three-Text(閱讀資料)（2） Power consumption systemThe power consumption system can roughly be cat

11、egorized into the following genres: 1）Starter System: the main part is the starter, whose task is to start the engine. 2） Ignition system: it is part of the gasoline engine, including all components of an electronic ignition system or conventional ignition system. Its mission is to produce high-volt

12、age spark, according to the working order of the engine ignited combustible mixture within the cylinder.Part Three-Text(閱讀資料) 3）Lighting system: it includes a variety of lights inside and outside the vehicle and ensures the inevitable lighting for safe driving at night, among which head lighting is

13、the most important. Military vehicles add the anti-aircraft lighting.4）Signal system: it includes electric horn, buzzer, flasher lights and other various signal lamps, which are the necessary signals mainly used to ensure safe driving.Part Three-Text(閱讀資料)5）Electronic control system: it mainly refer

14、s to the computer-controlled apparatus, comprising of an electronic ignition control device, electronically controlled fuel injection device, the electronic control anti-lock brakes, electronically controlled automatic transmission, etc, which are respectively used to improve vehicles dynamic qualit

15、y, economical efficiency, security, handle the exhaust purification, automation and so on.Part Three-Text(閱讀資料) 6）Auxiliary equipment: this part includes electric wipers, cold starting preheating device, air conditioners, tape recorders, cigarette lighter, anti-theft devices, window glass lifter, se

16、at adjuster and the like. Auxiliary electrical appliances have a tendency to increase and move mainly towards the development of comfort, entertainment, safety protection.Part Three-Text(閱讀資料)(3)Detection SystemIt includes a variety of instrumentation such as voltmeter, ammeter, water temperature ga

17、uge, oil pressure gauge, fuel gauge, speedometer, engine tachometer and various warning lights for monitoring the work of the engine and other devices.Part Three-Text(閱讀資料)(4) Power Distribution SystemPower distribution system is made up of central junction box, circuit switches, safety device, conn

18、ector clip and wire, so as to ensure the reliability and safety of the line work.Part Three-Text(閱讀資料)2.The types of battery(1)FunctionBattery is a kind of reversible low-voltage DC power supply, an important part of the car. Battery can transform chemical energy into electrical energy and electric

19、energy can also be converted to chemical energy. Its role is to:Part Three-Text(閱讀資料)1) When starting the engine, starter supplies a large current, so it is called starter-typed battery.2) Provide power for the electrical equipment under the conditions that generator does not generate electricity or

20、 generate low voltage.3) When electrical equipment consumes more than generator can afford in a short time, it assists the generator to supply power to electrical equipment. 4) When battery power is low and the load of generator is small, it can transform the electrical energy into chemical energy a

21、nd store the electricity (ie, charge).Part Three-Text(閱讀資料)In addition, the battery is equivalent to a large capacitor, it can absorb the over-voltage generator at any time, protecting the transistor and prolonging its lifespan.TypesAccording toits external structure, the battery can be divided into

22、 rubber and plastic groove battery. And according to its property, the battery can be categorized into drained-charged battery, dry-charged battery and maintenance-free battery, etc. At present, lead-acid battery which is dry-charged and maintenance-free is widely used in the vehicles.Part Three-Tex

23、t(閱讀資料)Part Four-Dialogue exercise（對話練習）Situation: The following dialogue is between a customer, Cherry, and a repairman, Mr.Liu. Read it aloud and try to act it out.Customer:Hello!Repairman:Hi!Customer:My speedometer does not work.Repairman:When did you lubricate the speedometer-head last time?Cust

24、omer:I can not remember that. About one year ago.Repairman:Speedometers need periodic maintenance. We should lubricate the head once a year.Customer:How to do that?Repairman:Pull the cluster out, disconnect the cable, and feed modest doses of lubricant into the head.Customer:Oh, is it difficult?Repa

25、irman:No, I will get somebody to repair that at once.Customer:Ok, thank you.Repairman:Not at all.Part Four-Dialogue exercise（對話練習）Part Five-Notes to the text (難點解析)1.Automotive electrical system is an important symbol of the development level of modern vehicles and, scientific and technological cont

26、ent of vehicles has become one of the important indicators to measure the grade level of the modern automobiles.汽車電氣系統(tǒng)是衡量現(xiàn)代汽車發(fā)展水平的一個重要標志，其科技含量已成為衡量現(xiàn)代汽車檔次的重要指標之一的標志。2.Its necessary that vehicle maintenance workers should understand and master the structure of materials, the identification of the spar

27、e parts and their principles, and that receive, dispatch and keep the parts correctly.汽車維修工應了解和掌握電氣系統(tǒng)的構(gòu)造、配件識別方法及原理，對其進行正確收發(fā)與保管是十分必要的。3.The power supply system includes a battery, a generator and regulator.電源系統(tǒng)包括蓄電池、發(fā)電機及其調(diào)節(jié)器。4. Its mission is to produce high-voltage spark, according to the working or

28、der of the engine ignited combustible mixture within the cylinder.其任務是產(chǎn)生高壓電火花，按發(fā)動機的工作順序點燃氣缸內(nèi)的可燃混合氣。5. Battery is a kind of reversible low-voltage DC power supply, an important part of the car. Battery can transform chemical energy into electrical energy and electric energy can also be converted to c

29、hemical energy.蓄電池是一種可逆的低壓直流電源，是汽車電源的重要組成部分。蓄電池既能將化學能轉(zhuǎn)換為電能，也能將電能轉(zhuǎn)換為化學能。Part Five-Notes to the text (難點解析)6.When starting the engine, starter supplies a large current, so it is called starter-typed battery.起動發(fā)動機時，供給起動機大電流，故稱為起動型蓄電池。7.When battery power is low and the load of generator is small, it ca

30、n transform the electrical energy into chemical energy and store the electricity (ie, charge).蓄電池存電不足，而發(fā)電機負載又較小時，它可將發(fā)電機的電能轉(zhuǎn)變?yōu)榛瘜W能儲存起來(即充電)。Part Five-Notes to the text (難點解析)Lesson2Electronicfuelinjectionsystem電控燃油噴射系統(tǒng)Learning Objectives (學習目標)Learn about the definition of Automobile EFI.Learn about t

31、he operating conditions of Automobile EFI .Learn about the structure and the components of the electronic fuel injection system.Learn about the three main systems of the electronic fuel injection system.Grasp the main terms about the electronic fuel injection system.Part one stimulate students inter

32、est (激發(fā)興趣)The electronic fuel injection system has many components. They include fuel delivery system，air induction system，and electronic control system Look at the following picture and guess their English names.Part Two-Study Preparation（學習準備）1.New words to learn actuatorktjueitn.激勵者;電腦執(zhí)行機構(gòu);descri

33、ptiondskripnn.描述;形容;種類;類型;flowfluvi.流;垂;流出;harnessh:nsn.電線束，導線束metermi:tn.計量器;計量儀;modulemdju:ln.模塊;組件;speedspi:dn.速度;快速;wiringwarin.配線，布線;logistics ludistiks n.后勤，邏輯學detection dteknn.偵查;察覺;發(fā)覺;檢查;manifold mnfuldn.具有多種形式的東西;多支管;歧管（汽車引擎用于進氣或排氣）;mass msn.大量，大多;injection ndeknn.注射;注射劑;2.Phrase learning （

34、短語學習）air-fuel mixture 可燃混合器ECU=electronic control unit 電控單元（模塊）high-load 高負荷，大負荷operating condition 工作狀況，工況theoretical air-fuel ratio 理論空燃比warm-up 熱車，暖車Part Two-Study Preparation（學習準備）Part Three-Text(閱讀資料)The electronic fuel injection system can be divided into three basic subsystemsThey are the fue

35、l delivery system，air induction system，and the electronic control system1.Fuel Delivery System The fuel delivery system (Fig.5-1) consists of the fuel tank，fuel pump，fuel filter, fuel delivery pipe(fuel rail)，fuel injector, fuel pressure regulator, and fuel return pipe Fuel is delivered from the tan

36、k to the injector by means of an electric fuel pumpThe pump is typically located in or near the fuel tankContaminants are filtered out by a high capacity inline fuel filterFuel is maintained at a constant pressure by means of a fuel pressure regulatorAny fuel which is not delivered to the intake man

37、ifold by the injector is returned to the tank through a fuel return pipePart Three-Text(閱讀資料)2.Air Induction SystemThe air induction system (Fig.5-2) consists of the air cleaner，air flow meter, throttle valve，air intake chamber, intake manifold runner，and intake valveWhen the throttle valve is opene

38、d，air flows through the air cleaner, through the air flow meter(to L type systems)，past the throttle valve，and through a well tuned intake manifold runner to the intake valveAir delivered to the engine is a function of driver demandAs the throttle valve is opened further, more air is allowed to ente

39、r the engine cylinder Part Three-Text(閱讀資料)Part Three-Text(閱讀資料)3.Electronic Control SystemThe electronic control system (Fig.5-3) consists of various engine sensors，ECU，fuel injector assemblies，and related wiring Part Three-Text(閱讀資料)The EFI system uses various sensors to detect the operating condi

40、tions of the engine and the vehicle. In accordance with the signals from these sensors, the ECU calculates the optimal fuel injection volume and operates the injectors in order to inject the proper volume of fuel.Part Three-Text(閱讀資料)The ECU determines precisely how much fuel needs to be delivered b

41、y the injector through monitoring the engine sensorsThe ECU turns the injectors on for a precise amount of time，which is reffered to as injection pulse width or injection duration，to deliver the proper air-fuel ratio to the engineAt other times, such as during warm-up, acceleration, deceleration, or

42、 high-load driving conditions, the engine ECU detects those conditions with the various sensors and then corrects the fuel injection volume in order to ensure an optimal air-fuel mixture at all time.Part Three-Text(閱讀資料)There are two types of EFI system classified by the intake air detection method

43、. L-EFI (Air-flow control type)This type uses an air-flow meter to detect the amount of the air flowing in the intake manifold . There are two types of detection methods: One directly measures the intake air mass , and one makes corrections based on the air volume.Part Three-Text(閱讀資料)D-EFI ( Manifold pressure control type )This type measures the pressure in the intake manifold to detect the amount of the intake air using the intake air density . Part Three-Text(閱讀資料)Part Four-Dialogue exercise（對話練習）Situation: The following dialogue is between Tom, a car