| 摘要 |
A method of controlling an air-fuel ratio in an internal combustion engine provided across a catalyst converter thereof with first and second air-fuel ratio sensors respectively or in a system therefor, wherein such an arrangement is adopted that a learning correction value is set and stored while learning an air-fuel ratio correction value obtained by the second air-fuel ratio sensor through averaging processing and the like, the progress degree of learning is stored for each learning, and the learning correction value is corrected in accordance with a correction rate commensurate to the progress degree of the learning. With this arrangement, facilitation of learning and improvement of learning accuracy are compatible with each other, and this compatibility leads to elimination of the initial deviation in air-fuel ratio as much as possible when a transfer is made from non-feedback control state to feedback control state of the air-fuel ratio, or, when the operation region is changed, thereby improving the exhaust gas purifying performance. |
