Ongoing work with methanol- and ethanol-fueled engines has demonstrated improved brake thermal efficiencies over the baseline diesel engine and low steady state NOx, HC and CO, along with inherently low PM emissions. In addition, the engine is expected to have significant system cost advantages compared with a similar diesel, mainly by virtue of its low-pressure port fuel injection (PFI) System. While recognizing the considerable challenge associated with cold start, the alcohol-fueled engine nonetheless offers the advantages of being a more efficient, cleaner alternative to gasoline and diesel engines. The unique engine used for this work is a turbocharged. The engine operates unthrottled using stoichiometric fueling from full power to near idle conditions, using exhaust gas recirculation (EGR) and intake manifold pressure to modulate engine load. These characteristics make the engine attractive for hybrid vehicle applications, for which it was initially developed, yet the significant expansion of the high-efficiency islands suggest that it may have broader appeal to conventional powertrain systems. With further refinement, this clean, more efficient and less expensive alternative to today's petroleum-based IC engines should be considered as a bridging technology to the possible future of hydrogen as a transportation fuel.
High efficiency and low emissions from a port-injected engine with neat alcohol fuels
2002
7 Seiten, 7 Bilder, 26 Quellen
Conference paper
English
High efficiency and low emissions from a port-injected engine with neat alcohol fuels
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