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Compression pressurized direct fuel injection to reduce emissions from existing small two-stroke transports.

机译:压缩加压直接燃料喷射以减少现有的小型二冲程运输工具的排放。

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The two-stroke engines commonly used in transports in developing countries suffer from exceedingly high emissions of hydrocarbons (HC) and carbon monoxide (CO). The problem of emissions from two-stroke engines will be largely addressed via emissions regulations on new vehicles typically resulting in their replacement with four-stroke engines. The existing fleet of two-stroke vehicles, however, is liable to be a major source of air pollution for the next few decades. Technologies, such as direct fuel injection (DI) and catalytic after-treatments, exist which are capable of being retrofitted to existing two-stroke engines to resolve their emissions problems. However, they are generally prohibitively expensive for applications in developing countries. A review of existing technologies indicates that direct fuel injection is the most promising and mature technology readily applicable to existing two-stroke machines. A cost reduced design modification using compression pressurization of an Air Blast DI (ABDI) system is proposed and modeled. A compression pressurized DI engine retrofit is designed and fabricated. Finally, emissions and power output measurements are taken on the compression pressurized direct fuel injection system showing similar power production to the carbureted engine, an 86% reduction in HC emissions, and an 83% reduction in CO at a cost of approximately two thirds of the ABDI system.
机译:在发展中国家的运输中通常使用的二冲程发动机遭受碳氢化合物(HC)和一氧化碳(CO)的极高排放。二冲程发动机的排放问题将通过新车辆的排放法规得到解决,通常会导致其被四冲程发动机替代。但是,现有的两冲程车辆车队很可能在未来几十年成为空气污染的主要来源。存在诸如直接燃料喷射(DI)和催化后处理之类的技术,其能够被改装至现有的二冲程发动机以解决其排放问题。但是,对于发展中国家的应用而言,它们通常过于昂贵。对现有技术的回顾表明,直接燃油喷射是最有希望且最成熟的技术,可轻松应用于现有的二冲程机器。提出并建模了使用Air Blast DI(ABDI)系统的压缩加压来降低成本的设计修改。设计并制造了一种压缩增压的DI发动机。最后,在压缩加压直接燃油喷射系统上进行了排放和功率输出测量,显示出与化油器发动机相似的功率产生,HC排放量减少了86%,CO减少了83%,而成本大约是三分之二。 ABDI系统。

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