| 摘要 |
In an air-fuel ratio control system, a gain Kh is adaptively determined on the basis of a value z obtained by multiplying a target fuel amount difference value Deltaym (derivative value of a target fuel amount) by an error e between a target excess fuel ratio (target phi) and an actual excess fuel ratio (actual phi) detected by an air-fuel ratio sensor. A value obtained by multiplying the target fuel amount difference value Deltaym by the gain Kh is determined as an F/F corrected value ucmp. In this case, when the error e between the target phi and the actual phi is determined in consideration of the fact that a controlled system has dead time d, a target phid at the point in time going back in the past by the amount of the dead time d is used to obtain error e=target phid-actual phi.
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