Control device for internal combustion engine

A control device for an internal combustion engine, the control device comprising a processor configured to:

• calculate a change amount of a parameter indicating a combustion state of the internal combustion engine, and
• correct an operation amount of an actuator that adjusts a dilution of an air-fuel mixture according to a difference between the change amount of the parameter indicating the combustion state and a target value of the change amount, and bring the change amount close to the target value, wherein
• the actuator is an EGR valve, and
• the processor is configured to
• increase an opening of the EGR valve as the difference increases in a case where the change amount of the parameter indicating the combustion state is less than the target value,
• decrease the opening of the EGR valve as the difference increases in a case where the change amount of the parameter indicating the combustion state is more than the target value,
• calculate a combustion center position based on the parameter indicating the combustion state,
• advance an ignition timing in a case where an average value of the combustion center positions is out of a predetermined range, and
• increase discharge energy generated in an ignition device in a case where the average value of the combustion center position is within the predetermined range and the change amount of the parameter indicating the combustion state is more than the target value.