汽车专业英语project3_Engine_components教材教学课件.pptVIP

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * 改革创新示范教材 * Valve operating mechanism 任务 实施 As for the camshaft drive, there are three ways such as belt drive, chain drive and gear drive (shown in figure 3.2.6). Generally speaking, the mechanism with both the beneath camshaft and the mid camshaft is mostly adopted the cylindrical timing gear drive. It usually needs just a pair of timing gears from crankshaft to camshaft. If the gear diameter is too large, an intermediate gear may be added. The chain drive is suitable for the overhead camshaft, but the reliability and the durability of the drive is not as good as that of the gear drive. In recent years, the toothed belt with low noise and low cost is widely used in high-speed car engine instead of the drive chain. 改革创新示范教材 * 改革创新示范教材 * Task 3 Electronic Fuel Injection system 1.New words and expressions carburetor [kɑ:bj?ret?] n. 汽化器, 化油器 sensor ?[?sens?] n. 传感器,灵敏元件 appropriate ?[??pr?upri-it, ??pr?uprieit] a. (适)恰当的 pressurize [pre??,ra?z] vt. 对…施加压力、给…增压 nozzle [n?z?l] n. 管嘴、喷嘴 injector [ind?ekt?] n. 喷油器 discharge [dist?ɑ:d?] vt. 执行、履行 spray [sprei] vt. vi. 喷 n. 浪花、飞沫、喷雾 ?circuit ?[?s?:kit] n. 电路，线路； vibration ?[vai?brei??n] n. 颤动；振动 atomize [?t?maiz] v. 使分裂为原子、将…喷成雾状 知 识 准 备 改革创新示范教材 * degree of richness 浓度 air-fuel ratio 空燃比 integrate with 与…结合在一起 fuel consumption 燃料消耗（量），耗油率 wiring harness 线束 electronic fuel injection(EFI)　 电子燃油喷射 throttle body　 节气门体 intake manifold 进气歧管 知 识 准 备 改革创新示范教材 * Electronic fuel Injection system 任务 实施 On old cars, it is a carburetor that sends the correct air-fuel mixture to the engine. The carburetor is a mixing device which mixes liquid gasoline with air. The mixture must vary degree of richness continually to suit engine operation conditions. Therefore, the electric fuel injection system has replaced the function of the carburetor in modern car engines. Fuel injection system prov