汽车专业英语(幻灯片)chapter 6 electrical system.ppt

electrical and electronic system seaspecial english for automobile chapter 6 electrical and electronic system question 1: list the major parts of a car electrical system. battery starter charging system ignition lighting auxiliary electronic device seaspecial english for automobile chapter 6 electrical and electronic system the purpose of the battery is to store electrical energy. it does this by converting the electrical energy supplied to it into chemical energy so that when an electrical current is required the energy change is reversed. 蓄电池用于储存电能，它将电能转变为化学 能储存，在用电时再将化学能转变为电能。 seaspecial english for automobile chapter 6 electrical and electronic system in making the battery, several similar plates are properly spaced and welded to form a plate group. plates of two types are used, one for the positive plate group, the other for the negative plate group. a positive plate is nested with a negative plate group, with separators placed between the plates to form an element. separators are designed to hold the plates apart so that they do not touch, and at the same time they must be porous enough to permit electrolyte to circulate between the plates. 在制造蓄电池时，几块相似的极板以适当的间隔焊在一起组成极 板组极板组分为两种，阳极板组和阴极板组一块阳极板被一 组阴极板所包围，隔板放在两组极板之间形成一个单元隔板又 必须具有多孔性，使电解液能够在各极板间流动 seaspecial english for automobile chapter 6 electrical and electronic system question 2: list the types of battery. positive plate 正极板 negative plate electrolyte inlet 电解液入口 dilute h2so4 稀释的h2so4 lead-acid battery 铅酸电池 nickel-hydrogen battery 镍氢 电池 绝缘层 seaspecial english for automobile chapter 6 electrical and electronic system hydrogen fuel cell 氢燃料电池 lithium-ion battery 锂离子 positive plate negative plate electrolyte water water acid acid can 金属 容器 anode 阳极 cathode 阴极 seaspecial english for automobile chapter 6 electrical and electronic system the charging system provides the electrical energy a car needs once its engine starts. the charging system does two jobs. first, it provides electrical power for the ignition system and the cars electrical accessories. second, it replaces the power used by the battery in starting the car. in other words, the charging system maintains the batterys state of charge. 一旦开始发动，充电系统就给汽车提供电能。充电 系统有两个任务：首先，给点火系和电力附件提供 电能；其次，给电池补充在起步时消耗的电能，换 句话说，就是维持电池的电荷状态。 seaspecial english for automobile chapter 6 electrical and electronic system question : whats the operation theory of alternator? electricity can be produced by moving a conductor through a magnetic field, the opposite also holds true. by moving the magnetic field and holding the conductor, electricity can be generated in the conductor. this current is called an induced current. this is the basic principle of the alternator, an electromechanical device that changes mechanical energy into electrical energy. 导体在磁场中移动会产生电流，反之也成立。保持 导体固定不动，移动磁场，导体中就会产生电流， 该电流称为感应电流。发电机的基本原理就是这样 的，通过机电装置把机械能转变为电能。 seaspecial english for automobile chapter 6 electrical and electronic system let us imagine that the wire loop is rotated between the north and south poles of the magnetic field. if the ends of the loop are now connected via collector rings and carbon brushes to a voltmeter, it will be possible to read off an alternating voltage owing to the constantly changing position of the loop with respect to the poles. 假设线圈在磁场中的南极和北极间转动如果线圈 的一端通过集电环和电刷与伏特计相连，将能够读 取由于线圈相对于磁极不停的改变位置而产生的交 流电压 seaspecial english for automobile chapter 6 electrical and electronic system the starter must crank the engine at a specified minimum speed (starting speed) in order to generate the air-fuel mixture necessary for self-sustained operation of spark-ignition engines, even under adverse conditions, and must support the engine as it runs up to minimum self-sustained speed after initial ignition. 为了保证点燃式发动机持续工作所需的可燃混合气，起动机 必须在某一确定的最低转速（起动转速）起动发动机，甚至 在不利工况下也是这样。点火后，起动机还要维持发动机在 最低的稳定转速下转动。 seaspecial english for automobile chapter 6 electrical and electronic system electric motors (dc, ac and three-phase), as well as hydraulic and pneumatic motors are used as starting motors for internal-combustion engines. 直流电机、交流电机和三相交流电机，以及液压和 气压电机都可用作内燃机的起动机。 seaspecial english for automobile chapter 6 electrical and electronic system question : whats the starting conditions of starter? starting limit temperature cranking be required to conquer resistance minimum crank speed seaspecial english for automobile chapter 6 electrical and electronic system seaspecial english for automobile chapter 6 electrical and electronic system when current from the battery is passed through the wire, the steel core becomes a strong magnet. the magnetic force of the core pulls in the plunger. the shift lever is attached to one end of the plunger. then the movement of the plunger causes the shift lever to move outward. this lever, in turn, moves the pinion gear into mesh with the ring gear. the solenoid uses magnetic force to do the mechanical work of moving the shift lever that engages the two gears. 蓄电池电流流过线圈时，铁芯成为强磁铁。铁芯的磁 力推动柱塞，推杆同柱塞一端接触，柱塞的运动使推 杆向外移动，从而推杆移动小齿轮与飞轮齿圈啮合。 电磁线圈利用磁力移动推杆使两齿轮接合。 seaspecial english for automobile chapter 6 electrical and electronic system the solenoid also does another important job. there is a contact disc on the other end of the plunger. when current flows through the coil of wire, the contact disc attached to the plunger moves and makes contact with two terminals. 电磁线圈也完成另一个重要任务。在柱塞的另一端 有一个触盘。电流流过线圈时，与柱塞接触的触盘 移动，同两个接线端相连接。 seaspecial english for automobile chapter 6 electrical and electronic system current flows from the battery to the starter motor, and the crankshaft begins to rotate. when current stops flowing to the solenoid, the bottom of the shift lever moves back. this disengages the pinion gear from the ring gear. 电流从蓄电池流向起动机，曲轴开始旋转。线 圈中的电流停止时，推杆底端向后移动，小齿 轮与齿圈分离. seaspecial english for automobile chapter 6 electrical and electronic system the design of the ignition system in the spark-ignition engine depends upon how ignition is triggered, ignition timing adjustment and how the high tension is distributed and conveyed. the following table shows a classification of various ignition systems. 点火式发动机点火系统的设计取决于点火触发，点 火正时调整以及高压电的分配和输送下表说明各 种类型的点火系统 seaspecial english for automobile chapter 6 electrical and electronic system question : list the types of ignition system. coil ignition (ci) transistorized ignition (ti) semiconductor ignition (si) distributorless semiconductor ignition(dsi) ignition triggering (pulse generator) mechanicalelectronicelectronicelectronic determining the ignition angle on the basis of the speed and load condition of the engine mechanicalmechanicalelectronicelectronic high-tension generationinductiveinductiveinductiveinductive distribution and assignment of the ignition spark to the correct cylinder mechanicalmechanicalmechanicalelectronic power sectionmechanicalelectronicelectronicelectronic seaspecial english for automobile chapter 6 electrical and electronic system question : list the main parts of coil ignition system. seaspecial english for automobile chapter 6 electrical and electronic system question 10: list the actions of coil ignition system. contact oncontact off seaspecial english for automobile chapter 6 electrical and electronic system when the ignition is switched “on”, the primary circuit delivers low-voltage current from the battery through ignition switch to the primary coil, then to ground. current flows in the circuit long enough to build up a strong magnetic field in the primary coil windings. at the moment when a cylinder is ready to begin the power stroke, the circuit is opened by the contact-breaker. 点火开关为“on”时，蓄电池的低压电流通过点火开关由初级 回路输送给初级线圈，再接地。电流流经初级回路的时间足够 长以使在初级线圈的绕组中建立强磁场。当某一气缸作功冲程 开始时，触点式断电器断开初级回路。 seaspecial english for automobile chapter 6 electrical and electronic system when the primary circuit is opened, the breakdown in the coils magnetic field creates high voltage in the secondary wiring. this high voltage is delivered to the center terminal of the distributor cap. this terminal then feeds the electricity through a rotor inside the distributor. the rotor turns continuously, aligning itself with terminals that deliver electricity to the spark plugs. as the rotor turns, the high-voltage electricity flows to each spark plug in turn and causes a spark to arc at the tip of each plug. this spark ignites the air/fuel mixture and keeps the engine running. 当初级回路断开时，点火线圈磁场衰减，在副线圈中产生高压电 高压电输送给分电器的中心电极，中心电极通过分火头分配高 压电。分火头连续旋转，同火花塞接线端对准，依次向每个火花 塞分配高压电，在火花塞末端产生火花，形成电弧。火花点燃可 燃混合气，维持发动机的运转。 seaspecial english for automobile chapter 6 electrical and electronic system the ignition distributor of the breaker-triggered transistorized ignition system (ti-b) is identical to the ignition distributor of the breaker- triggered coil ignition system (si). however, since the contact operates in conjunction with a transistorized ignition system, the contact breaker no longer needs to switch the primary current but only the control current for the transistorized ignition system. the transistorized ignition system itself plays the role of a current amplifier and switches the primary current via an ignition transistor. 断电器触发晶体管点火系统（tib）的分电器同断电器触发线 圈点火系统是一样的。只是由于触点配合晶体管工作，断电器 不再控制初级电流，而是控制晶体管点火系的控制电流。晶体 管点火系统起电流放大器的作用，通过晶体管控制初级电流。 seaspecial english for automobile chapter 6 electrical and electronic system the operating principle is based upon the fact that the air gap between the