| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device of an internal combustion engine preventing emission from being deteriorated or of preventing driveability from being deteriorated during the cold start of the engine. <P>SOLUTION: When an air-fuel ratio upon the completion of the warm-up of an air fuel ratio sensor is separated from a target air-fuel ratio by an open control performed during the warm-up of the air-fuel ratio sensor, a combustion stability FB control is performed to set a rate at which an actual air-fuel ratio approaches the target air-fuel ratio based on the stability of the combustion state of the internal combustion engine. Since the actual air-fuel ratio gradually approaches the target air-fuel ratio, the combustion state is prevented from being abruptly changed. Consequently, the emission is prevented from being deteriorated and also the driveability is prevented from being deteriorated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
