汽车专业英语课件与汽车专业英语读译教程2版配套11U6TB.pptVIP

 UNIT 6ENGINE ELECTRICAL SYSTEMSTEXT BDirect Ignition Systems and Electronic Triggering Devices   UNIT 6  ENGINE ELECTRICAL SYSTEMS TEXT BDirect Ignition Systems and Electronic Triggering Devices ? Direct Ignition System  ? Electronic Triggering Devices  本次课学习目标 掌握直接点火系统的组成 掌握主要部件的型式及原理 掌握有关的专业名词与术语 了解翻译技巧—增词 NEW WORDS wafer [weif?] n.晶片, 圆片, 薄饼 tab [t?b] n.标签, 制表符, 短小突出部 shutter [∫?t?] n.关闭者, 百叶窗, 快门 slit [slit] n.裂缝, 狭长切口；v.切开, 撕裂 incidence [‘insid?ns] n.发生，影响，发生率 auto shut down relay 自动关闭继电器 life expectancy 预期寿命，预计使用期限 magnetic pickup 电磁式传感器 trigger wheel 磁阻轮 air gap 气隙 reluctor wheel 磁阻轮 Hall-effect switch 霍尔效应开关 optical sensor 光电式传感器 rotor plate 遮光板 light emitting diode 发光二极管(LED) photo sensitive diode 光电二极管，光敏二极管 photo diode 光电二极管 Independent Ignition System (Coil-On-Plug or Coil-Near-Plug) The independent ignition system is also known as a coil-on-plug system or coil-near-plug and uses one coil for each cylinder. The independent ignition system mounts an ignition coil as an assembly directly to a spark plug or near the spark plug with a very short secondary ignition wire. The coil on plug design allows for increased coil saturation time between cylinder firing. Coil saturation time is the period when current flows through the primary windings, increasing the magnetic field generated, and thereby increasing the secondary voltage when required [1]. Misfires are more likely to occur under higher engine speeds and increased load conditions. The ability to increase firing voltage when required lowers the risk of intermittent misfires. The coil on plug independent ignition system either uses one ignition module to control the primary circuit of all coils (Fig. 6-5) or integrates the ignition module into each coil assembly (Fig.6-6) or integrates the ignition module into the PCM (CHRYSLER). The