| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress production of an exhaust odor in a spark ignition type internal combustion engine including a variable compression ratio mechanism and a variable valve timing mechanism. <P>SOLUTION: The spark ignition type internal combustion engine includes the variable compression ratio mechanism A which can change a mechanical compression ratio, a variable valve timing mechanism B which can control the valve closing time of a gas intake valve, and an exhaust cleaning catalyst 20 provided in an engine exhaust passage. An expansion ratio is heightened upon engine low load operation as compared with one upon engine high load operation and fuel cut control stopping supply of fuel to the inner part of a combustion chamber 5 can be performed. The expansion ratio is heightened when the temperature of the exhaust cleaning catalyst is a prescribed temperature or higher as compared with the case that the temperature is lower than the prescribed temperature during a period after the execution condition of fuel cut control is established until supply of fuel into the combustion chamber is stopped. <P>COPYRIGHT: (C)2012,JPO&INPIT |
