Combustion state control system of internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 2003
Grant Date -
Mar 7, 2002
app pub date -
Jul 16, 2001
filing date -
Jul 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a direct injection spark ignition engine which is operable in lean-burn operation modes including a pre-mixture combustion mode and a stratified combustion operation mode and a stoichiometric air/fuel ratio operation mode, which are different in the desired air/fuel ratio. The degradation of combustion state is detected through misfire detection and if it is determined to be degraded, the desired air/fuel ratio, the EGR flow rate and the ignition timing are changed when the engine is operated in the stratified combustion operation mode, while the desired air/fuel ratio, the EGR flow rate and the purge flow rate are changed when the engine is operated in the pre-mixture combustion operation mode, thereby ensuring to suppress the combustion state degradation effectively.
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