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Study on Combustion Control in PCCI Diesel Engine Using a Combustion Mode Based on Stochastic Approach
Technical Paper
2007-08-0401
Sector:
Event:
JSAE Autumn Conference
Language:
Japanese
Abstract
To obtain a strategy for combustion control to achieve low NOx emission with high thermal efficiency in DI-PCCI operation of diesel engines, numerical study was conducted using a combustion model including a stochastic-PDF mixing model with a reduced chemical kinetic scheme. Effects of injection timing and rate on heat release and NOx formation processes were investigated under late-injection PCCI conditions. The results indicate that the combustion model successfully describe the trends of NOx, maximum pressure rise rate and thermal efficiency. The mechanisms which control heat release and NOx formation were discussed paying attention to the effects of fuel-air mixing.