PROFESSIONAL ENGLISH UNIT 6 ENGINE ELECTRICAL SYSTEMS TEXT B Direct Ignition Systems and Electronic Triggering Devices
UNIT 6 ENGINE ELECTRICAL SYSTEMS TEXT B Direct Ignition Systems and Electronic Triggering Devices PROFESSIONAL ENGLISH
本次课学习内容 UNIT 6 ENGINE ELECTRICAL SYSTEMS TEXT B Direct lgnition Systems and Electronic Triggering Devices o Direct Ignition System o Electronic Triggering Devices
UNIT 6 ENGINE ELECTRICAL SYSTEMS TEXT B Direct Ignition Systems and Electronic Triggering Devices • Direct Ignition System • Electronic Triggering Devices 本次课学习内容
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
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 coil- on-plug a点火线圈在火花塞上的 saturation[ set fa'reifen]n饱和(状态)浸润浸透,饱和 度 intermittent[inta() mitent]a间歇的,断断续续的 misfire[ mis ' faia]v不发火,缺火 confirmation[ konfa'meifan]n证实,确认,批准 verify[ verifi]v检验,校验,查证,核实 command[ko' ma:nd] n命令,掌握,司令部;ⅴ命令,指挥, 支配 recommend[ rekea'mend]vt推荐,介绍,劝告,使受欢迎 swap[sWp]v交换;n交换 expectancy[ ik'spektensi]n期待,期望
NEW WORDS coil-on-plug a.点火线圈在火花塞上的 saturation [ֽsæ t∫ə'rei∫ən] n.饱和(状态), 浸润, 浸透，饱和 度 intermittent [ֽintə (:) 'mitənt] a.间歇的, 断断续续的 misfire ['mis'faiə] v.不发火，缺火 confirmation [ֽkɔnfə'mei∫ən] n.证实, 确认, 批准 verify ['verifai] v.检验, 校验, 查证, 核实 command [kə'mɑ:nd] n.命令, 掌握, 司令部；v.命令, 指挥， 支配 recommend [rekə'mend] vt.推荐, 介绍, 劝告, 使受欢迎 swap [swɔp] v.交换；n.交换 expectancy [ik'spektənsi] n.期待, 期望
wafer[weif]n晶片,圆片,薄饼 tab[teb]n标签,制表符,短小突出部 shutter[JAt]n关闭者,百叶窗,快门 slit[sitn裂缝,狭长切口;v切开,撕裂 incidence [insides]n发生,影响,发生率
wafer ['weifə] n.晶片, 圆片, 薄饼 tab [tæ b] n.标签, 制表符, 短小突出部 shutter ['∫ʌtə] n.关闭者, 百叶窗, 快门 slit [slit] n.裂缝, 狭长切口；v.切开, 撕裂 incidence [‘insidəns] n.发生，影响，发生率
PHRASES AND EXPRESSIONS heat shield 隔热板挡热板 mounting plate 安装板 Jumper wire 跨接线 transmission clutch变速器换档离合器 independent ignition独立点火系统 system saturation time (磁)饱和时间 intermittent misfire断续性缺火 firing order 点火顺序 compare m to N 将M与N比较 crank position sensor曲轴位置传感器
PHRASES AND EXPRESSIONS crank position sensor 曲轴位置传感器 compare M to N 将M与N比较 firing order 点火顺序 intermittent misfire 断续性缺火 saturation time （磁）饱和时间 independent ignition 独立点火系统 system transmission clutch 变速器换档离合器 jumper wire 跨接线 mounting plate 安装板 heat shield 隔热板,挡热板
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 reductor 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
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
Direct ignition Systems and electronic Triggering Devices Direct Ignition System Some engines use a distributorless ignition system that eliminates the need for spark plug wires. The direct ignition system( DIS)utilizes a coil tower that is installed onto a cover plate and plug boots that fit directly onto the spark plugs. The ignition module and coils are installed under the coil tower The spark is transmitted to the plug boots through secondary conductors located in the tower This system operates using the same principles as the distributorless ignition system Electronic Ignition Systems with Coils Connected Directly to the Spark Plugs These El systems have the same reluctor ring and magnetic sensor as other electronic injection(ED) systems. However, on these El systems, the spark plug wires are eliminated and the coil secondary terminals are connected directly to the spark plugs
Direct Ignition Systems and Electronic Triggering Devices Direct Ignition System Some engines use a distributorless ignition system that eliminates the need for spark plug wires. The direct ignition system (DIS) utilizes a coil tower that is installed onto a cover plate and plug boots that fit directly onto the spark plugs. The ignition module and coils are installed under the coil tower. The spark is transmitted to the plug boots through secondary conductors located in the tower. This system operates using the same principles as the distributorless ignition system. Electronic Ignition Systems with Coils Connected Directly to the Spark Plugs These EI systems have the same reluctor ring and magnetic sensor as other electronic injection (EI) systems. However, on these EI systems, the spark plug wires are eliminated and the coil secondary terminals are connected directly to the spark plugs
Since the spark plug wires are eliminated, the chance of high-voltage leaks is reduced. The coil module and coils are mounted under a plate that is positioned between the cam covers on top of the engine(Fig. 6-3). Each coil is connected to a pair of spark plugs, and the spark plug pairs are 1-4 and 2-3. Since the coil module contacts the mounting plate, this plate acts as a heat shield. The mounting plate must be grounded to the engine to provide ignition operation. Remote spark plug wires may be connected between the spark plugs and the coil secondary terminals for test purposes, but the coil mounting cover must be grounded with a jumper wire during this test procedure The operation and electrical connections(Fig. 6-4)for these El systems are similar to the El system explained previously. The PCM reduces the spark advance for a few milliseconds during transmission shifting to lower the engine torque load on the transmission clutches
Since the spark plug wires are eliminated, the chance of high-voltage leaks is reduced. The coil module and coils are mounted under a plate that is positioned between the cam covers on top of the engine (Fig.6-3). Each coil is connected to a pair of spark plugs, and the spark plug pairs are 1-4 and 2-3. Since the coil module contacts the mounting plate, this plate acts as a heat shield. The mounting plate must be grounded to the engine to provide ignition operation. Remote spark plug wires may be connected between the spark plugs and the coil secondary terminals for test purposes, but the coil mounting cover must be grounded with a jumper wire during this test procedure. The operation and electrical connections (Fig.6-4) for these EI systems are similar to the EI system explained previously. The PCM reduces the spark advance for a few milliseconds during transmission shifting to lower the engine torque load on the transmission clutches
Cover Ignition coils Electronic ignition module Connector. Boot =t Retainer Camshaft housing cover Fig 6-3 Ignition systems with coils connected directly to the spark plugs
Fig. 6-3 Ignition systems with coils connected directly to the spark plugs