Intake control system for internal combustion engine

An intake control system for an internal combustion engine, for setting a target intake air amount according to a target torque of the engine and controlling an intake air amount based on the set target intake air amount, comprising:

• maximum intake air amount-calculating means for calculating, based on operating conditions of the engine, a maximum amount of intake air that can be drawn into a combustion chamber, as a maximum intake air amount;
• provisional intake air amount-setting means for setting a plurality of provisional intake air amounts different from each other within a range of the intake air amount, which ranges from 0 to the calculated maximum intake air amount;
• estimated torque-calculating means for calculating, based on the operating conditions of the engine, estimated torques that are estimated to be output from the engine assuming that the set plurality of provisional intake air amounts of intake air are drawn into the combustion chamber, respectively, as a plurality of estimated torques;
• provisional intake air amount-estimated torque relationship-setting means for setting a provisional intake air amount-estimated torque relationship, which is a relationship between the plurality of provisional intake air amounts and the plurality of calculated estimated torques;
• and
• target intake air amount-setting means for setting a minimum provisional intake air amount that makes the estimated torque equal to or close to the target torque, as the target intake air amount, by selecting the minimum provisional intake air amount from the set provisional intake air amount-estimated torque relationship.