Research of High Compression Ratio Combustion in a DI Diesel Engine

-Combustion Chamber under After Injection-

Abstract

In order to reduce exhaust emissions and increase the brake thermal efficiency in a direct injection (DI) diesel engine, we pursued the combustion chamber and the fuel injection characteristics under the common rail fuel injection system and the high compression ratio. As a result, we could find the combustion chamber improving NOx, smoke emission and the brake thermal efficiency. And the relations between the combustion chamber and the fuel injection characteristics, gas flow and combustion characteristics were clarified.