| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device for internal combustion engine capable of more reducing the discharge quantity of NOx after completing cut processing. SOLUTION: This air-fuel ratio control device for internal combustion engine determines whether running condition of a vehicle is in an accelerating condition or a non-accelerating condition after completing cut processing for cutting supply of fuel to a vehicular internal combustion engine (step S210), and performs rich processing for making an air-fuel ratio of fuel-air mixture rich so as to discharge oxygen stored in a three-dimensional catalyst from the three-dimensional catalyst when any of the accelerating condition and non-accelerating condition is determined. This air-fuel ratio control device sets a degree of richness in the accelerating condition of the vehicle larger than a degree of richness in the non-accelerating condition of the vehicle (step S220). COPYRIGHT: (C)2009,JPO&INPIT
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