《汽车专业英语》课程教学资源（PPT课件讲稿，英文版）UNIT 7 EMISSION CONTROL SYSTEMS

PROFESSIONAL ENGLISH UNIT 7 EMISSION CONTROL SYSTEMS TEXTA Overview of Emission Control Systems

UNIT 7 EMISSION CONTROL SYSTEMS TEXT A Overview of Emission Control Systems PROFESSIONAL ENGLISH

PROFESSIONAL ENGLISH UNIT 7 EMISSION CONTROL SYSTEMS TEXTA Overview of Emission Control Systems PCV System o EGR System Evaporative Control System Air Iniection ● Catalytic Converter

UNIT 7 EMISSION CONTROL SYSTEMS TEXT A Overview of Emission Control Systems • PCV System • EGR System • Evaporative Control System • Air Injection • Catalytic Converter PROFESSIONAL ENGLISH

本次课学习目标 ●掌握排放控制系统的组成 ●掌握排放控制系统的原理 ●掌握有关的英文专业术语 了解翻译技巧一重复

本次课学习目标 ⚫ 掌握排放控制系统的组成 ⚫ 掌握排放控制系统的原理 ⚫ 掌握有关的英文专业术语 ⚫ 了解翻译技巧—重复

NEW WORDS dilute daiju:tV冲淡,变淡,变弱,稀释 crossover " krosouv]n转线路,天桥,交叉 channel ∫aenl n海峡,水道,信道,频道,通道 route lru:t n路线,路程,通道;ⅴ发送 lean (out) V贫化,变瘦 thermal rθ:m。a.热的,热量的 transducer traenz'dju:sn传感器,变频器,变换器 orifice trifid n孔,口,节流孔

NEW WORDS dilute [dai'lju:t] v.冲淡, 变淡, 变弱, 稀释 crossover ['krɔs ֽ ouvə] n.转线路, 天桥, 交叉 channel ['t∫ænl] n.海峡，水道，信道，频道，通道 route [ru:t] n.路线, 路程, 通道；v.发送 lean （out） [li:n] v.贫化，变瘦 thermal ['θə:məl] a.热的, 热量的 transducer [trænz'dju:sə] n.传感器，变频器，变换器 orifice ['ɔrifis] n.孔，口，节流孔

linear nla a线的,直线的线性的 potentiometer poten∫imin.电位计,电势计 ume Ifju:m]n(浓烈或难闻的)烟,气体;v用烟熏, 冒烟,发怒 prohibit Prohibit] v.禁止,阻止 adhere Id'hi]ⅴ粘附,胶着,坚持 pop Iapl n砰的一声,爆裂声,流行乐曲,流行 艺术 a.流行的,热门的,通俗的 ⅴ发出爆裂声,爆开,射击,突然出现 diverter Idai'v:t3]n分流器,换向器,分流阀 divert di'vs:tv转移,转向 catalvtic L kaeta'litik a.催化的 muffler mAl]n消声器

linear ['liniə] a.线的, 直线的, 线性的 potentiometer [pə ֽ ten∫i'ɔmi tə] n.电位计, 电势计 fume [fju:m] n.(浓烈或难闻的)烟, 气体；v.用烟熏, 冒烟, 发怒 prohibit [prə'hibit] v.禁止, 阻止 adhere [əd'hiə] v.粘附, 胶着, 坚持 pop [pɔp] n.砰的一声, 爆裂声, 流行乐曲, 流行 艺术 a.流行的, 热门的, 通俗的 v.发出爆裂声, 爆开, 射击, 突然出现 diverter [dai'və:tə] n.分流器，换向器，分流阀 divert [di'və:t] v.转移, 转向 catalytic [ֽ kætə'litik] a.催化的 muffler ['mʌflə] n.消声器

pellet Split n小球 honeycomb[" hAnikoumn蜂房,蜂巢 platinum' platinum]n白金,铂 palladium [pa'leidiam] n tU catalyst " kaetalist!n催化剂 render I' renda致使,表演,实施

pellet ['pelit] n.小球 honeycomb ['hʌnikoum] n.蜂房，蜂巢 platinum ['plætinəm] n.白金, 铂 palladium [pə'leidiəm] n.钯 catalyst ['kætəlist] n.催化剂 render ['rendə] v.致使，表演，实施

PHRASES AND EXPRESSIONS at worst 在最坏的情况下 throttle opening 节气门开度 EGR valve 废气再循环阀 wide-open throttle大节气门开度(简写为WoT) back pressure 背压 bleed port 通气孔 tapered tip 锥形端 EGR valve position EGR阀位置(EvP)传感器 (EVP)sensor pulse width 脉宽调制 modulation

PHRASES AND EXPRESSIONS pulse width 脉宽调制 modulation EGR valve position EGR阀位置（EVP）传感器 (EVP) sensor tapered tip 锥形端 bleed port 通气孔 back pressure 背压 wide-open throttle 大节气门开度（简写为WOT） EGR valve 废气再循环阀 throttle opening 节气门开度 at worst 在最坏的情况下

charcoal canister 活性炭罐 along with 与.一道(同时),以及,除.之 外(还) purge valve 清污阀 diverter valve 分流阀 air pump 空气泵 catalytic converter催化转换器 air injection 空气喷射

air injection 空气喷射 catalytic converter 催化转换器 air pump 空气泵 diverter valve 分流阀 purge valve 清污阀 与…一道（同时），以及，除…之 外（还） along with charcoal canister 活性炭罐

Overview of Emission Control Systems To minimize pollution of the atmosphere from incompletely burned and evaporating gases and to maintain good driveability and fuel economy, a number of emission control systems are used on all vehicles. They include positive crankcase ventilation(PCV) system, evaporative emission control(EVAP) system, exhaust gas recirculation(EGR system, air injection(AIR) system and three-way catalytic converter(Twc) system PCV System The purpose of the positive crankcase ventilation(PCv system is to take the vapors produced in the crankcase and piston blow-by, and redirect them into the air/fuel intake system to be burned during combustion. These vapors dilute the air/fuel mixture, they have to be carefully controlled and metered so as not to affect the performance of the engine. This is the job of the positive crankcase ventilation(PCv) valve

Overview of Emission Control Systems To minimize pollution of the atmosphere from incompletely burned and evaporating gases and to maintain good driveability and fuel economy, a number of emission control systems are used on all vehicles. They include positive crankcase ventilation (PCV) system，evaporative emission control (EVAP) system，exhaust gas recirculation (EGR) system，air injection (AIR) system and three-way catalytic converter (TWC) system. PCV System The purpose of the positive crankcase ventilation (PCV) system is to take the vapors produced in the crankcase and piston blow-by, and redirect them into the air/fuel intake system to be burned during combustion. These vapors dilute the air/fuel mixture, they have to be carefully controlled and metered so as not to affect the performance of the engine. This is the job of the positive crankcase ventilation (PCV) valve

At idle, when the air/fuel mixture is very critical, just a little of the vapors are allowed in to the intake system at high speed when the mixture is less critical and the pressures in the engine are greater, more of the vapors are allowed in to the intake system [1]. When the valve or the system is clogged, vapors will back up into the air filter housing or at worst, the excess pressure will push past seals and create engine oil leaks [2]. If the wrong valve is used or the system has air leaks, the engine will idle rough, or at worst engine oil will be sucked out of the engine EGR System Exhaust gas recirculation(EGR) systems reduce the amount of oxides of nitrogen produced during the combustion process. The EGR system dilutes the air/fuel mixture with controlled amounts of exhaust gas. Since exhaust gas does not burn, this reduces the peak combustion temperatures

At idle, when the air/fuel mixture is very critical, just a little of the vapors are allowed in to the intake system. At high speed when the mixture is less critical and the pressures in the engine are greater, more of the vapors are allowed in to the intake system [1]. When the valve or the system is clogged, vapors will back up into the air filter housing or at worst, the excess pressure will push past seals and create engine oil leaks [2]. If the wrong valve is used or the system has air leaks, the engine will idle rough, or at worst engine oil will be sucked out of the engine. EGR System Exhaust gas recirculation (EGR) systems reduce the amount of oxides of nitrogen produced during the combustion process. The EGR system dilutes the air/fuel mixture with controlled amounts of exhaust gas. Since exhaust gas does not burn, this reduces the peak combustion temperatures