Abstract
Abstract
Purpose of this research is to investigate the effects of oil diluted by post injected fuel for CDPF regeneration on engine wear and to find out the characteristic variation of diluted oil according to operating condition. An experiment was performed on 2700cc, 5 cylinder, "XDi 270 engine with after-treatment system" of Ssangyong Motor Company. Fuel content in oil was increased as the duration of post injection is increased. Fuel dilution chart was made to predict the existing fuel content in used oil. Oil analysis method using this chart was validated through the comparison with the result analyzed by GC. The oil contamination by post injected fuel caused the quantity of blow-by gas and engine wear to increase and main gallery pressure to decrease.