Improvement of exhaust emissions of premixed compression ignition engine with fuel injection near top dead center

摘要

Premixed lean diesel combustion was performed with fuel injection timing near top dead center. As a result, the lean and uniform fuel-air mixture can form with low cetane fuel (CN=19) in order to take a longer ignition period even the fuel injection timing was at 26°ATDC, low NO{sub}x combustion was realized. Furthermore HC was reduced because the fuel-air mixture that dispersed to a squish area decreased. This combustion could be possible when a conventional diesel fuel and EGR was combined. However ignition timing could not be adjusted to top dead center.