Control device for supercharged engine

A control device for a supercharged engine having a waste gate valve, comprising:

• a throttle opening sensor configured to measure a value of a throttle opening;
• a pressure sensor configured to measure a value of a throttle upstream pressure;
• an air flow meter configured to measure a value of an intake flow rate;
• an electronic control unit configured to:
• estimate a value of a waste gate valve opening corresponding to a manipulated variable of the waste gate valve in accordance with a first predefined correspondence relation;
• obtain a first relation which is established between a throttle downstream pressure and an intake valve flow rate based on the estimated value of the waste gate valve opening by using an intake valve model in which a relation that is established between the throttle downstream pressure, the waste gate valve opening, and the intake valve flow rate is modeled;
• obtain a second relation which is established between the throttle downstream pressure and a throttle flow rate based on a measured value of the throttle opening and a measured value of the throttle upstream pressure by using a throttle model in which a relation that is established between the throttle upstream pressure, the throttle downstream pressure, the throttle opening, and the throttle flow rate is modeled;
• estimate a value of the intake valve flow rate in a case in which the intake valve flow rate corresponds to the throttle flow rate based on the first relation and the second relation;
• correct the first predefined correspondence relation based on a first comparison between the estimated value of the intake valve flow rate and a measured value of the intake flow rate;
• and
• operate the waste gate valve to control a turbo rotational speed or regulate a supercharging pressure.