Intake air control apparatus and intake air control method for internal-combustion engine

An intake air control apparatus for an internal-combustion engine in which an air-fuel ratio of an air-fuel mixture of fuel injected from a fuel injection valve and air drawn into a cylinder is controlled so as to be a predetermined value, the intake air control apparatus comprising:

• an intake air adjusting device configured to adjust an intake air amount;
• a rotation speed detector configured to detect a rotation speed of the internal-combustion engine;
• an ignition timing acquiring device configured to acquire ignition timing for the internal-combustion engine;
• an operating mode determination device configured to determine whether the internal-combustion engine is in a predetermined high rotation speed and high load operation mode in which cooling is required by increasing an amount of fuel;
• and
• an intake air reduction controller configured to, if the operating mode determination device determines that the internal-combustion engine is in the predetermined high rotation speed and high load operation mode, control the intake air adjusting device so that the intake air amount is reduced in accordance with the rotation speed of the internal-combustion engine detected by the rotation speed detector and the ignition timing acquired by the ignition timing acquiring device in order to restrict a fuel injection quantity to be injected from the fuel injection valve so that the fuel injection quantity does not exceed a maximum fueling rate of the fuel injection valve.