Control system and control method for internal combustion engine

摘要

An intake air volume flowing into an intake passage is controlled by a throttle opening. When the engine speed decreases, a valve timing of an intake valve and an exhaust valve is corrected so as to increase the torque of an internal combustion engine. The throttle opening is corrected so as to increase the intake air volume when the engine speed falls below a desired speed while an intake line pressure is equal to, or less than, a predetermined pressure.