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首页> 外文会议>Global Powertrain Congress on Advanced Engine Design amp; Performance vol.36; 20060919-21; Novi,MI(US) >The Future of Gasoline Direct Injection
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The Future of Gasoline Direct Injection

机译：汽油直喷的未来

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摘要

The gasoline direct injection (DI) engine plays an important role in today's and future Powertrain concepts. Its potential to enhance fuel economy and at the same time fulfill demands for higher specific power output is an essential feature for success in the automotive marketplace. Especially against other competing novel concepts such as modern Diesel engines or Hybrid Powertrain, the DI technology is able to meet existing and future market demands at a reasonable add-on cost.rnThe introduction of Gasoline DI technology requires maximum applicability to various engine families, like smaller displacement high value 4 cylinder engines for compact class vehicles. But systems can be fitted to yield best performance and fuel economy also and especially for the high feature or premium class with its 6- and 8-cylinder Powertrain DI.rnThis contribution outlines various strategies for installation and operation of DI systems on SI engines.rn1. Multi-hole type injection technology allows flexible and optimized spray patterns for a wide variety of existing engine designs. A demand-controlled high-pressure pump provides precise fuel delivery to the common fuel rail.rn2. Results for stochiometric and lean stratified operation are presented. Moreover, the principles of downsizing using DI and turbo-chargers are demonstrated on 4-cylinder applications representative for the US market.rn3. The DI low emission concept proposes a reliable and efficient catalyst-heating strategy, known as "Homogeneous-Split Injection". Further improvements using a cold-start strategy calledrn"High-Pressure Stratified Start" are demonstrated. Fuel is injected by means of increased fuel pressure during compression stroke and greatly enhances mixture preparation.rn4. An unconventional yet efficient approach to further reduction of fuel-consumption with an excellent cost-benefit ratio represents the direct-start with starter-assistance as part of a future start-stop-system. This presentation gives insight about reliability, reproduc-ibility, noise and emissions, which are considered to be key requirements for customer acceptance of start-stop systems.
机译：汽油直喷（DI）发动机在当今和未来的动力总成概念中扮演着重要角色。它具有增强燃油经济性并同时满足对更高比功率输出的需求的潜力，是在汽车市场上取得成功的基本特征。尤其是与其他竞争性新概念（例如现代柴油发动机或混合动力总成）相比，DI技术能够以合理的附加成本满足现有和未来的市场需求。rn引入汽油DI技术要求最大程度地适用于各种发动机系列，例如紧凑型车辆的小排量高价值4缸发动机。但是系统也可以安装以达到最佳性能和燃油经济性，特别是对于具有6缸和8缸动力总成DI的高性能或高级级别。rn该贡献概述了在SI发动机上安装和操作DI系统的各种策略。 。多孔型喷射技术可为多种现有发动机设计提供灵活优化的喷射方式。按需控制的高压泵可将燃油精确地输送到公用燃油轨。给出了化学计量和稀薄分层操作的结果。此外，在美国市场具有代表性的4缸应用中证明了使用DI和涡轮增压器进行小型化的原则。 DI低排放概念提出了一种可靠而有效的催化剂加热策略，称为“均相分流喷射”。演示了使用称为“高压分层启动”的冷启动策略的进一步改进。在压缩冲程期间，通过增加燃料压力来喷射燃料，并大大增强了混合气的制备。一种非常规而又有效的方法，以极佳的成本效益比进一步降低了燃油消耗，它代表了未来启动-停止-系统中启动器的直接启动。此演示文稿提供了有关可靠性，可再现性，噪声和排放的见解，这些被认为是客户接受启停系统的关键要求。

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