Fuel supply amount control apparatus for internal combustion engine

A fuel supply amount control apparatus for internal combustion engine, comprising:

• a fuel injection valve for injecting fuel into an intake system of the internal combustion engine;
• required fuel amount computing means for computing a required fuel amount according to operating conditions of the internal combustion engine;
• evaporation time constant computing means for computing an evaporation time constant indicating changes over time of a fuel amount introduced into a cylinder from the intake system after injection of fuel by the fuel injection valve based on a reference evaporation time constant relative to a predetermined reference engine rotational speed and a reference engine load and on engine rotational speed and engine load at a time of evaporation time constant computing;
• residual fuel amount computing means for computing a fuel amount remaining in the intake system using the evaporation time constant computed by the evaporation time constant computing means;
• and
• fuel injection amount computing means for computing a fuel amount injected from the fuel injection valve, based on a required fuel amount computed by required fuel amount computing means and the residual fuel amount computed by the residual fuel amount computing means.