1-unit_4_ignition_starting_and_charging_system1.ppt

Unit 4 Engine Ignition ,Starting and Charging System Engine Ignition System （发动机点火系统） Parts of The Distributor（分电器部件） The Electrical Circuit of Starting System（起动系统电路） Starter Performance Test （起动机性能测试） Translation Skill (4)词类的转译 Exercises（练习）1.Translate the following into Chinese 2.Translate the following into English 3.Translate the following sentences into English （1）spark plug gap （2）primary current （3）neutral start switch （4）cranking motor （5）distributor housing （6）TDC （7）high–tension cord （8）hold–down bolt （9）clutch mechanisms （10）Armature shaft （1）火花塞间隙 （2）初级电流 （3）空挡起动开关 （4）起动机 （5）分电器壳体 （6）下止点 （7）高压线 （8）压紧螺栓 （9）离合机构 （10）电枢轴 （1）空气滤清器盖 （2）信号转子 （3）分电器插接器 （4）点火顺序 （5）励磁线圈 （6）电压调节器 （7）充电指示灯 （8）易熔线 （1）Air cleaner cap （2）Signal rotor （3）Distributor connector （4）Firing order （5）Field coils （6）Voltage regulator （7）Charge indicator （8）Fusible link * * 1. Engine Ignition System The ignition system is used to ignite the air and fuel in the cylinder. In order to do this a very high voltage is needed to force the electrical current to jump across the spark plug gap and cause an electrical spark. However, there is only 12-volt battery within the automobile. The ignition system is designed to increase the voltage to the necessary amount at the right time for the spark to occur. In addition, the time of spark must be altered as speed and load increase or decrease. voltage 电压，伏特数 electrical current 电流 jump across 击穿 spark plug gap 火花塞间隙 automobile 汽车 alter 变化 The ignition system may be classified as follows: (1) Conventional ignition system with contact breaker (2) Electronic ignition system using semiconductors or transistors (3) Computer-controlled ignition system The computer-controlled ignition system is composed of Electronic Control Module (ECM), various sensors, battery, the ignition switch, igniter, ignition coil, distributor and the spark plugs. Fig.1-4-1 shows a ignition system. as follows