| 摘要 |
An air-fuel ratio control apparatus for an internal combustion engine includes an operative state detection unit for detecting an operative state of the internal combustion engine, a purge quantity calculation unit for calculating a quantity of purge air and a purge rate calculation unit for calculating a purge rate from the purge air quantity calculated by the purge quantity calculation unit and from the operative state detected by the operative state detection unit. A purge air concentration calculation unit calaulates a purge air concentration from the purge rate and the air-fuel ratio feedback correction coefficient. A purge air concentration correction unit calculates a purge air concentration correction coefficient based on the purge rate and the purge air concentration, and a fuel injection quantity calculation unit calculates an injection quantity of fuel, based on the air-fuel ratio feedback correction coefficient and the purge air concentration correction coefficient.
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