Abstract
Keywords
Common Rail Diesel Engine, Combustion Stability, Pilot injection
Abstract
This paper describes the effect of the split injection on combustion stability and emission characteristics in a common rail diesel engine at various operating conditions. In this experiment, the combustion pressures and exhaust emissions such as NOx and soot were measured at various split injection timings and fuel quantities injected per a cycle. The experimental apparatus of this study is composed of 4 cylinder engine installed with piezoelectric pressure sensor, EC dynamometer, exhaust gas analyzer for the measurement of NOx, CO, HC and soot emissions. The experimental results of this study show that the pressure is increased smoothly near the TDC and the noise is reduced by the effect of pilot injection. Also NOx emission is dramatically decreased as the ratio of pilot injection is increased because the combustion temperature is decreased.