Method for controlling internal combustion engine and device for controlling internal combustion engine

A control method for an internal combustion engine including

• a supercharger positioned on an upstream side of a first throttle valve arranged to control an intake air amount,
• a second throttle valve positioned on the upstream side of the supercharger, and arranged to control an intake pressure on the upstream side of the supercharger,
• an EGR passage arranged to recirculate a part of an exhaust gas to a portion between the supercharger and the second throttle valve, and
• an EGR valve arranged to adjust an EGR gas flow rate flowing in the EGR passage,
• the control method comprising:
• setting a target valve opening degree of the first throttle valve in accordance with a load,
• sensing a valve opening degree of the second throttle valve,
• judging whether or not the valve opening degree of the second throttle valve is an opening degree of the second throttle valve on a closing side of the second throttle valve relative to a predetermined set valve opening degree, and
• correcting the valve opening degree of the first throttle valve to an opening degree of the first throttle valve on the closing side of the first throttle valve relative to the target valve opening degree when the valve opening degree of the second throttle valve is judged to be the opening degree of the second throttle valve on the closing side of the second throttle valve relative to the predetermined set valve opening degree,
• upon the valve opening degree of the first throttle valve being corrected to the opening degree of the first throttle valve on the closing side of the first throttle valve relative to the target valve opening degree, a passage opening area of the first throttle valve is controlled to be smaller than a passage opening area of the second throttle valve.