EXHAUST PURIFICATION DEVICE FOR INTRACYLINDRICAL INJECTION-TYPE SPARK-IGNITION INTERNAL COMBUSTION ENGINE

摘要

When an internal combustion engine is in a cold state (S12), fuel is injected in the compression stroke such that the combustion air fuel ratio is equal to a theoretical air fuel ratio or a somewhat leaner air fuel ratio than the theoretical air fuel ratio (compression S/L operation) (S14), while suppressing the exhaust flow (S16).