| 摘要 |
PROBLEM TO BE SOLVED: To rapidly converge an air-fuel ratio to a stoichiometric point when an engine is operated at a rich air-fuel ratio after starting and then performs an air-fuel ratio feedback control. SOLUTION: After the activity of an air-fuel ratio sensor is detected based on the output of the air-fuel ratio sensor and a time passed after the starting, the reducing speed of a stability increasing value KSTB of a target air-fuel ratio correcting factor TFBYA is increased more than a case before the activity is detected while maintaining an air-fuel ratio feedback correction factor ALPHA at a reference value 1. Then, when the output of the air-fuel ratio sensor reaches a stoichiometric equivalent value SST#, the air-fuel ratio feedback control is started. COPYRIGHT: (C)2006,JPO&NCIPI
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