Browse Publications Technical Papers 2010-01-0866

Improvements to Premixed Diesel Combustion with Ignition Inhibitor Effects of Premixed Ethanol by Intake Port Injection 2010-01-0866

Premixed diesel combustion modes including low temperature combustion and MK combustion are expected to realize smokeless and low NOx emissions. As ignition must be delayed until after the end of fuel injection to establish these combustion modes, methods for active ignition control are being actively pursued. It is reported that alcohols including methanol and ethanol strongly inhibit low temperature oxidation in HCCI combustion offering the possibility to control ignition with alcohol induction. In this research improvement of diesel combustion and emissions by ethanol intake port injection for the promotion of premixing of the in-cylinder injected diesel fuel, and by increased EGR for the reduction of combustion temperature. The smoke emission was reduced with promotion of premixing due to longer ignition delay and shorter injection period of diesel fuel with ethanol port injection, and the NOx was reduced with decreases in intake oxygen content by EGR regardless of ethanol quantity. When ethanol quantity was set to 20% of the total energy supply and intake oxygen was reduced to 15% with EGR, smokeless and low NOx operation was established over a wide load range. It was revealed that the compression ratio should be reduced to promote premixing of the diesel fuel with ethanol as long as misfiring and knocking do not occur. The combination of premixed ethanol and EGR can achieve smokeless and ultra low NOx combustion even with the fuel injection pressure of 60 MPa. Although a high concentration of acetaldehyde is emitted with the ethanol port injection, an oxidation catalyst in the exhaust system can remove the emissions for all but extremely light engine load conditions.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

New Concept for Overcoming the Trade-Off between Thermal Efficiency, Each Loss and Exhaust Emissions in a Heavy Duty Diesel Engine


View Details


Combustion Characteristics of Dual-Fuel Diesel Engine Using Emulsified Bio-Fuel for Pilot Ignition


View Details


Different Hydrous Ethanol-Gasoline Blends - FTIR Emissions of a Flex-Fuel Engine and Chemical Properties of the Fuels


View Details