Fuel control system for internal combustion engine

Claim 1

A fuel control system for an internal combustion engine in which a quantity of fuel injected from a fuel injection means is determined on the basis of a quantity of a direct delivery part of fuel directly delivered to a combustion chamber from a fuel injector and a quantity of a drawn part of fuel delivered from an intake-manifold wetting fuel adhered to a wall surface of an intake-manifold, wherein a quantity of the intake-manifold wetting fuel, on the basis of which the quantity of said drawn part fuel is calculated, is calculated on the basis of a quantity of an adhering apart of the fuel which was injected through a preceding injection by the fuel injection means and a quantity of a residual part of a preceding intake-manifold wetting fuel and wherein the quantity of said intake-manifold wetting fuel is calculated according to formula τm=(1-α)·τe.sub.(i-1) +(1-β)·τm.sub.(i-31) where τm represents the quantity of the intake-manifold wetting fuel, α represents the proportion of the direct delivery part fuel which is empirically determined, β represents the proportion of the drawn part fuel which is empirically determined, τe.sub.(i-1) represents the quantity of fuel which was injected through the preceding injection and τm.sub.(i-1) represents the quantity of the preceding intake-manifold wetting fuel.