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Study of Di Diesel Combustion Improvement With Low Compression Ratio And/Or High Egr Ratio Using Bottom-Viewed, Single-Cylinder Diesel Engine
Published May 21, 2003 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The fuel economy at very low load is improved by lowering compression ratio due to reduced friction loss without combustion deterioration. This approach also much improves smoke emission, but it reduces the tolerance for accepting EGR. The high EGR ratio under the base compression ratio significantly improves indicated thermal efficiency because of reduced cooling loss resulting from lowered flame temperature. Further increase of EGR ratio drastically reduces smoke level. These causes were investigated by indicated pressure analysis, flame temperature measurement, combustion observation and radical components detection.