Several methods to reduce ignition delay period were tested in combination with a high pressure injection and effects on combustion improvement were examined.It was found that the reduction of ignition delay does not give so much improvement at the usual injection timing before TDC, but when the injection timing is considerably retarded or when the original ignition delay is relatively long, shortening of the ignition delay is effective to reduce pre-mixed combustion and NOx emission.Further, assuming the combustion system which conforms to the 1983 Japanese regulation as the reference system, it was found that the combination of pilot injection and high injection pressure, simultaneously reduces NOx by approximately 35% and smoke by 60-80% without worsening the fuel economy.
NOx Reduction from Diesel Combustion Using Pilot Injection with High Pressure Fuel Injection
Sae Technical Papers
International Congress & Exposition ; 1992
1992-02-01
Conference paper
English
NOx reduction from diesel combustion using pilot injection with high pressure fuel injection
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