Ignition control system and ignition control device

An ignition control apparatus applied to an engine comprising:

• a spark plug including a cylindrical ground electrode, a cylindrical insulator having a protruding portion held inside the ground electrode and protruding toward a tip side the spark plug relative to the ground electrode, and a center electrode held inside the insulator and exposed from the insulator;
• and
• an ignition coil including a primary coil and a secondary coil, and applying a secondary voltage to the spark plug using the secondary coil,
• wherein the ignition control apparatus includes a primary current control unit performing, in one combustion cycle of the engine, creeping discharge control for generating a creeping discharge along a surface of the insulator by cutting off primary current performed after supplying the primary current through the spark plug, and air discharge transition control for stopping the creeping discharge occurring in the spark plug by supplying the primary current through the primary coil after the creeping discharge control is performed, and for cutting off the primary current after a discharge stop period as a time required for transferring to an air discharge in which a discharge occurs at a position away from the insulator, ends.