Control Device

A control device that includes an ignition control unit that supplies a primary voltage to a primary side of an ignition coil provided in an internal combustion engine according to a predetermined ignition operation amount, discharges an ignition plug provided in the internal combustion engine, and controls an ignition of an air-fuel mixture in which a gas sucked into a cylinder of the internal combustion engine and a fuel are mixed, and that controls the internal combustion engine by the ignition control unit, wherein the ignition control unit includes:

• a secondary voltage calculation unit that calculates an average value of a secondary voltage generated on a secondary side of the ignition coil;
• an irregular flow ratio calculation unit that calculates a ratio of a cycle in which the average value of the secondary voltage is equal to or less than a set average value with respect to a cycle of the internal combustion engine in a predetermined period as an irregular flow ratio indicating that a flow of the air-fuel mixture in the cylinder is irregular;
• and
• an ignition operation amount correction unit that corrects the ignition operation amount so that the irregular flow ratio is equal to or less than a set ratio value that is a target to be reached of the irregular flow ratio.