Control device for internal combustion engine

A control device for an internal combustion engine, comprising:

• wall temperature parameter acquisition unit for acquiring a cylinder wall temperature of an internal combustion engine or a parameter corresponding to the cylinder wall temperature as a wall temperature parameter;
• cylinder wall temperature varying unit that is capable of changing the cylinder wall temperature;
• pre-ignition temperature region storage unit in which a pre-ignition suppression temperature region in which a pre-ignition occurrence frequency decreases more than in a peripheral temperature region is previously stored, the pre-ignition suppression temperature region being a temperature region that is set based on a relation between a pre-ignition occurrence frequency and the cylinder wall temperature;
• and
• cylinder wall temperature control unit for, in a case where an actual operating region that is a region in which the internal combustion engine is actually operating is within a predetermined pre-ignition susceptibility operating region, performing control using the cylinder wall temperature varying unit so that the wall temperature parameter falls within the pre-ignition suppression temperature region;
• wherein the cylinder wall temperature control unit is configured to raise the wall temperature parameter in a case where the wall temperature parameter is lower than the pre-ignition suppression temperature region, and configured to decrease the wall temperature parameter in a case where the wall temperature parameter is higher than the pre-ignition suppression temperature region.