NDLI: NOx and Fuel Economy Challenges With EMD Two-Stroke Engines: Variable Injection and Valve Timing

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Michael, B. Riley John, C. Hedrick
Copyright Year	2009
Abstract	NOx emissions are a major cause of ozone formation. Several technologies to mitigate NOx in internal combustion engines have been developed, both in-cylinder and aftertreatment. Some of these newer technologies are being implemented on new engines, but older engines, especially large diesel engines, have few options to reduce these emissions substantially. The most common method of NOx reduction is retarding the start of injection timing but this has a penalty in fuel economy. A program has been undertaken on an EMD 645E two-stroke diesel engine to combine a simple mechanical system with both retarded and variable start of injection — to mitigate NOx — with variable valve timing to offset the fuel economy penalty. Simulation modeling and on-engine experimentation have been carried out to quantify the extent of the NOx reduction with the impact on fuel economy.
Sponsorship	Internal Combustion Engine Division
Starting Page	9
Ending Page	17
Page Count	9
File Format	PDF
ISBN	9780791843635
DOI	10.1115/ICEF2009-14024
e-ISBN	9780791838587
Conference Proceedings	ASME 2009 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2009-09-27
Publisher Place	Lucerne, Switzerland
Access Restriction	Subscribed
Subject Keyword	Fuel efficiency Two-stroke engines Diesel engines Computer simulation Internal combustion engines Nitrogen oxides Valves Corporate average fuel economy Engines Emissions Cylinders
Content Type	Text
Resource Type	Article

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