Patent ID: 7761220

Claim:
A fuel control system of an internal combustion engine, comprising: a fuel adhesion rate computing means computing a fuel adhesion rate at which an injection fuel is adhered to an air intake pipe on the basis of a representative temperature at a position at which the injection fuel is adhered; a fuel evaporation rate computing means computing a fuel evaporation rate of the air intake pipe adhered fuel on the basis of the representative temperature of the position at which the injection fuel is adhered; a fuel adhesion amount computing means computing a fuel adhesion amount on the basis of the fuel injection amount and the fuel adhesion rate computed by said fuel adhesion rate computing means; a fuel film amount computing means computing a fuel film amount of the air intake pipe on the basis of the fuel adhesion amount computed by the fuel adhesion amount computing means and the fuel evaporation rate computed by said fuel evaporation rate computing means; a means for computing an applied heat quantity applied to the fuel adhered to the air intake pipe; a means for computing an absorbed heat quantity absorbed from the fuel adhered to the air intake pipe; a heat quantity balance computing means computing a balance of the applied heat quantity given to said fuel and the absorbed heat quantity absorbed from said fuel; an air intake manifold wall temperature estimating means estimating the representative temperature of the position to which said injection fuel is adhered, on the basis of the heat quantity balance computed by said heat quantity balance computing means; a fuel film correction coefficient computing means computing a fuel film correction coefficient on the basis of the fuel film amount computed by said fuel film amount computing means; and a fuel injection amount correcting means correcting the fuel injection amount on the basis of the fuel film correction coefficient computed by said fuel film correction coefficient computing means.