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UNIT 3 FUEL SYSTEM

UNIT 3 FUEL SYSTEM. 蒋 芳 吴喜骊. Basic Content. Aims and Requirements New Words Phrases and Expressions Notes to the Text Specialized Knowledge Exercises. Aims and Requirements. List five different circuits of carburetor Explain how an injector works

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UNIT 3 FUEL SYSTEM

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  1. UNIT 3 FUEL SYSTEM 蒋 芳 吴喜骊

  2. Basic Content Aims and Requirements New Words Phrases and Expressions Notes to the Text Specialized Knowledge Exercises

  3. Aims and Requirements List five different circuits of carburetor Explain how an injector works List the sensors of engine control unit Describe the function of fuel delivery system List the components of fuel delivery system

  4. New Words emission [i5miFEn] n. 散发，发射，排放 injection [in5dVekFEn] n. 注射，喷射 existence [i^5zistEns] n. 存在，存在物 evolve [i5vClv] v.（使）进展 requirement [ri5kwaiEmEnt] n. 需求，要求 circuit [5sE:kit] n. 电路，一圈 burst [bE:st] v.爆发；n.爆发，脉冲 hesitation [7hezi5teiFEn] n. 犹豫，踌躇 enrichment [in5ritFmEnt] n. 丰富，浓缩 trailer [5treilE] n. 追踪者，拖车

  5. New Words choke [tFEuk] n. 窒息，阻气门 oxygen [5CksidVEn] n. 氧 feasible [5fi:zEbl] adj. 可行的 carb [ka:b] n. 化油器 throttle [5WrCtl] n. 节流阀；v. 扼杀 port [pC:t] n. 港口，舱门，端口 sequential [si5kwinFEl] adj. 连续的，顺序的 spray [sprei] n. 喷雾；vt. 喷射，喷溅 component [kEm5pEunEnt] n. 成分 anticipation [7Antisi5peiFEn] n. 预期，预料

  6. New Words mass [mAs] n. 块，质量，大量 electromagnet[ilektrEu5mA^nit] n. 电磁石 squirt [skwE:t] v. 喷出 nozzle [5nCzl] n. 管口，喷嘴 atomize [5AtEmaiz] vt. 将…喷成雾状 accordingly [E5kC:diNli] adv. 因此，从而 algorithm [5Al^EriTEm] n. 运算法则 equation [i5kweiFEn] n. 相等，平衡，因素 multiply [5mQltipli] v. 繁殖，乘，增加 simplify [5simplifai] vt. 单一化，简单化

  7. New Words intersection [7intE(:)5sekFEn] n. 交叉点 millisecond [5mili7sekEnd] n. 毫秒 compensate [5kCmpEnseit] v. 偿还，补偿

  8. Phrases and Expressions fuel injection system 燃油喷射系统 main circuit 主供油系统 idle circuit 怠速系统 accelerator pump 加速泵 power enrichment circuit 加浓系统 catalytic converter 催化转换器 oxygen sensor 氧传感器 engine control unit 发动机控制单元 closed loop control 闭环控制 took over 接替

  9. Phrases and Expressions throttle body 节气门体 gas pedal 油门踏板 throttle valve 节气门阀 mass airflow sensor 空气流量传感器 oxygen sensor 氧传感器 throttle position sensor 节气门位置传感器 coolant temperature sensor 冷却液温度传感器 voltage sensor 电压传感器 engine speed sensor 发动机转速传感器 manifold absolute pressure sensor歧管压力传感器

  10. Notes to the Text [1] Very careful control of the air-to-fuel ratio was required for the catalytic converter to be effective. 为提高催化转换器的效率，必需精确控制空燃比。 [2] These systems have a fuel injector for each cylinder, usually located so that they spray right at the intake valve. 多点燃油喷射系统每个气缸都有一个喷油器，安装在进气门旁，实施喷射。

  11. Notes to the Text [3] The nozzle is designed to atomize the fuel -- to make as fine a mist as possible so that it can burn easily. 喷嘴的设计可以使燃油喷成雾状，并尽可能的细小，从而容易燃烧。 [4] The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open. 发动机的供油量取决于喷油器的开启时间。

  12. Notes to the Text [5] Some of the parameters even change over time in order to compensate for changes in the performance of engine components like the catalytic converter. 一些参数甚至随着时间在变化，用于补偿发动机附属装置性能的变化，比如催化转换器。

  13. Specialized Knowledge Fig.3-1 A partially open throttle valve Fig.3-2 A fuel injector

  14. Specialized Knowledge Fig.3-3 Fuel injectors mounted in the intake manifold of the engine Fig.3-4 Fuel delivery system

  15. Specialized Knowledge Fig.3-5 Fuel tank Fig.3-6 Fuel filter

  16. Exercises (1) Which was the last car sold in the United States to have a carburetor? (2) How many different circuits does the carburetor have? (3) What is the closed loop control? (4) Where are the injectors mounted in the multi-point fuel injection system? (5) How many sensors are there in the fuel injection system?

  17. Exercises (6) There are two main types of control for multi-port systems. What are they? (7) What is the function of the mass airflow sensor? (8) What is the function of the throttle position sensor? (9) How does the engine control unit determine the pulse width for given operating conditions? (10) Why do some of the parameters even change over time?

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