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The technical possibilities of an engine system (combustion and exhaust aftertreatment) which made good use of the properties of FTD fuel (zero sulfur, zero aroma and a high cetane number) were examined. Cleaner diesel operation with considerably lower exhaust emissions than current levels was achieved by making a small change to the combustion and exhaust aftertreatment system. For the research, a commercial 2L class small diesel engine was used, and this experimental mechanism was described in detail. [ABSTRACT FROM AUTHOR]

The correlation between diesel injector hydraulic nozzle flow rate and HC emissions under light load conditions was investigated using two injection nozzles with different hole diameters. Experimental results showed that (1) a reduced hydraulic nozzle flow rate (by reducing the nozzle hole diameter) is accompanied by stronger spray tip penetration when the fuel injection quantity is limited to the level of pilot injection, (2) the strong penetration accelerates fuel spray diffusion, creating an over-lean area in the fuel-air mixture, which causes an increase in HC emissions under light load conditions. [ABSTRACT FROM AUTHOR]

For the reduction of exhaust emissions of diesel engines, an improvement of a DI diesel engine system was carried out by using GTL fuel, which is expected as an alternative fuel. In this study, the combustion chamber, injection pattern and EGR calibration were modified utilizing combustion characteristics of GTL fuel. In addition, the after-treatment system for zero sulfur fuel was studied to realize a high conversion efficiency of NOx catalyst. As a result, the modified vehicle for GTL fuel realized J-SULEV regulation level emissions in vehicle test. [ABSTRACT FROM AUTHOR]