| 摘要 |
PROBLEM TO BE SOLVED: To accurately control an air-fuel ratio by correcting delay of feedback correction amount due to fuel supply delay and detection delay of the air-fuel ratio. SOLUTION: Basic fuel injection time at a point of time retroactively by time corresponding to fuel supply delay and detection delay of an air-fuel ratio and present basic fuel injection time are compared and delay correction amount FAFFIX for correcting delay till a change in fuel injection quantity appears in an air-fuel ratio detection value is calculated. Basic feedback correction amount FAFCAL calculated from the air-fuel ratio detection value is corrected by delay correction amount FAFFIX and final feedback correction amount FAF for present basic fuel injection quantity is determined. Thus, when basic fuel injection time is increased, delay correction amount FAFFIX is immediately reduced, feedback correction amount FAF is increased and delay of feedback correction amount FAF for a change in basic fuel injection time is eliminated.
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