CONTROLLER FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To control operation of a throttle valve and operation of a suction valve so that suction air amount and suction air pressure become target suction air amount and target suction air pressure securely. SOLUTION: This controller is provided with the throttle valve 13 arranged in a suction passage 13, an opening valve characteristic control means 17 for controlling opening valve characteristic of the suction valve 6, and a target value setting means for setting target suction air amount and target suction air pressure. It stores a first model expression for calculating a flow rate of air passing through the throttle valve from a suction air amount and a suction air pressure and a second model expression for calculating the degree of opening of the throttle valve from the flow rate and the suction air pressure of air passing through the throttle valve. The flow rate of air passing through the throttle valve is calculated from the first model expression based on the target suction air amount and the target suction air pressure, and degree of opening of the throttle valve is calculated from the second model expression based on the calculated air flow rate and the target suction air pressure to control the throttle valve in accordance with the calculated degree of opening of the throttle valve. COPYRIGHT: (C)2005,JPO&NCIPI