| 摘要 |
PROBLEM TO BE SOLVED: To prevent a trouble, that vapor or the like in fuel piping is mixed into injection fuel and an air-fuel ratio becomes lean if an engine is restarted when the cooling water temperature is high. SOLUTION: In this transient air-fuel ratio correction method, a basic fuel injection amount is calculated, based on at least the number of revolutions of an internal combustion engine cooled by cooling water, to conduct enrichment correction of the basic fuel injection amount by a transient enrichment value depending on a transient state where the internal combustion engine is transient, and then a cooling water temperature in a transient state is detected. When the detected cooling water temperature is higher than a determination temperature in advance which is higher than the cooling water temperature at least at the time of finishing warming up, the enrichment correction of the basic fuel injection amount is conducted by the transient enrichment value more than a transient enrichment value when the cooling water temperature is lower than the determination temperature.
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