INTERNAL COMBUSTION ENGINE AND CONTROL DEVICE THEREOF

In an internal combustion engine provided with a turbocharger, a throttle valve, and a WGV, if there is a request for switching from stoichiometric combustion to lean combustion and also there is a request for raising a supercharging pressure after the switching of combustion higher than the supercharging pressure before the switching of combustion, the supercharging pressure reserve control for raising the supercharging pressure while a requested intake air amount S required for realizing a requested torque of the internal combustion engine in the stoichiometric combustion is maintained is executed by using the throttle valve and the WGV. After the supercharging pressure reserve control is finished, the switching of combustion is executed. When an actual supercharging pressure reaches the lower of a requested supercharging pressure L and a realizable supercharging pressure, the supercharging pressure reserve control is finished.