| 摘要 |
PURPOSE:To improve accuracy by making a greater correction as the throttle opening is smaller in a range where the degree of learning progress is low, when a deviation of a feedback correction factor from a reference value in the operating range is learnt for each operating range divided by the throttle opening. CONSTITUTION:A learning correction factor memory means E stores a learning correction factor which is used to correct a basic fuel injection quantity for each operating range divided by a throttle opening. A learning correction factor retouching means J learns a deviation of an air-fuel ratio for each operating range from a reference value in that range for retouching the learning correction factor of the memory means in decreasing so as to renew the value. The frequency of retouching for the learning correction factor is stored in a learning progress degree means, and in a range where the frequency of retouching is less, a learning correction factor estimating means L replaces the learning correction factor with the sum of a reference value and a deviation of the learning correction factor from the reference value multiplied by a correction factor which is set at a value smaller as the throttle opening is smaller.
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