Cylinder intake air amount calculating apparatus for internal combustion engine

A cylinder intake air amount calculating apparatus for an internal combustion engine is provided. The cylinder intake air amount calculating apparatus calculates a cylinder intake air amount which is an amount of fresh air sucked in a cylinder of the engine using an intake air pipe model equation which is obtained by modeling an intake pipe of the engine. An intake air flow rate which is a flow rate of fresh air passing through the intake pipe of the engine is obtained. The cylinder intake air amount is calculated by applying the intake air flow rate and a preceding value of the cylinder intake air amount to the intake pipe model equation. A predicted intake air flow rate which is a predicted value of the intake air flow rate is calculated. A predicted cylinder intake air amount which is a predicted value of the cylinder intake air amount is calculated by applying the predicted intake air flow rate and the cylinder intake air amount to the intake pipe model equation.