| 摘要 |
PURPOSE: A method for learning the fuel feedback gain for a vehicle is provided to prevent the sensibility of the exhaust gas from being degraded by learning and adjusting the fuel feedback gain even though an oxygen sensor is aged. CONSTITUTION: A method checks the rich condition or the lean condition by whether the present output of an oxygen sensor is more than a reference value when the RPM and load are in the aged determining region. If the run condition is checked, the previous output is checked whether it is the rich condition or run condition. If the lean condition is checked, the fuel feedback gain is adjusted with the conversion to the rich condition of the previous oxygen output by increasing the number of the rich/lean inversion in the oxygen sensor by one. If the rich condition is checked, the previous output is checked whether it is the rich condition or lean condition. If the lean condition is checked, the fuel feedback gain is adjusted with the conversion to the rich condition of the previous oxygen output by increasing the number of the rich/lean inversion in the oxygen sensor by one.
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