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所在平台: Udemy |
课程主页: https://www.udemy.com/course/gasoline-direct-injection-fundamentals/
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**课程名称：** 汽车工程 - 汽油直喷概述 **课程内容总结：** 本课程旨在介绍汽油直喷（GDI）发动机技术，重点关注其在降低燃油消耗率（BSFC）和满足更严格排放标准方面的应用。 GDI发动机结合了传统汽油（SI）发动机的功率特性和柴油发动机的燃油经济性，特别是在部分负荷工况下。 课程将深入探讨以下关键领域： * **GDI发动机的优势：** 与传统汽油喷射（PFI）发动机相比，GDI发动机的潜在优势。 * **燃油系统要求：** GDI发动机燃油系统的关键组成部分及其特性。 * **燃油喷油器特性：** 满足不同工况下燃油喷射需求的喷油器设计与性能。 * **燃油喷雾特性：** 影响燃烧效率的燃油喷雾的雾化和传播特性。 * **GDI燃油系统与缸内流动场的匹配：** 如何优化燃油喷射系统以在发动机整个运行范围内实现理想的混合气形成。 * **缸内流动结构：** 影响混合气形成和燃烧的缸内气流模式。 * **燃油-空气混合：** 优化混合气形成以提高燃烧效率。 * **燃烧室几何形状：** 不同燃烧室设计对GDI发动机性能的影响。 * **发动机运行模式与燃油喷射策略：** 针对不同工况（例如，低负荷、高负荷）制定的多模式燃油喷射策略。 * **燃烧室类型：** 介绍GDI发动机常用的几种燃烧室类型。 总而言之，本课程将全面介绍汽油直喷发动机的核心技术，包括其工作原理、关键组件、设计挑战以及在现代汽车工程中的重要作用。
IntroductionIn the recent years, heavy emphasis on reducing the BSFC while meeting the stringent emission normsOver the past two decades, attempts have been made to develop an internal combustion engine for automotive applications that combines the best features of the SI and the diesel engines.The objective has been to combine the specific power of the gasoline engine with the efficiency of the diesel engine at part load.Research has indicated that a promising candidate for achieving this goal is a direct-injection, four-stroke, sparkignition engine that does not throttle the inlet mixture to control the load.In this engine, a fuel spray plume is injected directly into the cylinder, generating a fuel-air mixture with an ignitable composition at the spark gap at the time of ignition.This class of engine is designated as a direct-injection, stratified-charge (DISC) enginePotential benefits of GDI over PFIFuel System requirementsFuel injector characteristicsFuel spray characteristicsThe fuel injection system in a GDI engine is a key component that must be carefully matched with the specific in cylinder flow field to provide the desired mixture cloud over the entire operating range of the engineA well-atomized fuel spray must be produced for all operating conditionsA GDI fuel system needs to provide for at least two, and possibly three or more distinct operating modes.Flow structureFuel air mixingCombustion chamber geometryEngine operating modes and fuel injection strategiesTypes of combustion chambers
