Study of Improvement for Combustion Stability under Cold Start Condition of DI Diesel Engine (First Report)

-Study for Improvement of Combustion Stability by Multiple Injection-

Abstract

For diesel engine, more lower compression ratio has been demanded to improve fuel consumption, output power and emission recently. However, low compression ratio engine may have some issues in combustion instability under cold start condition. In this study, the validity of the multi pilot injection which was combustion instability improvement methods of diesel engine was considered using the combustion analysis by cylinder pressure sensor with glow plug function and CFD simulation which was improved to apply under cold start condition. As a result, it was found that controlling the equivalence ratio and temperature surrounding glow plug appropriately by multi pilot injection was contributing to the improvement of combustion stability under cold start condition.