专业英语准论文The engine Ignition-system ).doc

成 绩 评阅人 The engine Ignition-system Service and Maintenance 学院： 学期：2010-2011第二学期 课程： 专 业 英 语 专业： 车辆工程 班级： 学号： 姓名： The engine Ignition-system Service and Maintenance The gasoline engine in the compression on the check point, close to the mixture is the spark plug ignites, thus burning to do work, for this, the foreign gasoline engine in the combustion chamber are equipped with the spark plug. The spark plug has a central electrode and a side electrode, two of the insulation between electrodes is. When two electrodes in the spark plugs and dc voltage is the voltage between and increase to a certain value, the spark plug the gap between two electrodes will be breakdown and produce electric spark, can spark plug in the generation between two electrodes to minimum voltage electric spark of called breakdown voltage; Can spark plug the generation between two electrodes in all the equipment of electric spark called engine ignition system. Composition: The ignition system mainly by the power supply, the ignition switch, ignition coil, cut-out relay, with electrical appliances, capacitor, spark plug, high voltage wires, additional resistance etc Traditional ignition system by batteries, generators, ignition coil, cut-out relay, spark plug etc. Common type and traditional ignition system is similar to use electronic components to replace break electrical appliances. Electronic ignition type are all full electronic ignition system, completely cancelled a mechanical device, electronic ignition control system by time, including batteries, generators, ignition coil, spark plugs and electronic control system, etc. Function: The automotive ignition system has two basic functions: it must control the spark and timing of the spark plug firing to match varying engine requirements, and it must increase battery voltage to a point where it will overcome the resistance offered by the spark plug gap and fire the plug. Principle of work: The pow