Knocking control method for internal combustion engine and knocking control device

A knocking control device of an internal combustion engine comprising:

• a knocking detection sensor provided at the internal combustion engine;
• a knocking judgment unit configured to perform knocking judgment by comparing a signal of the knocking detection sensor with a knock judgment threshold value;
• and
• an ignition timing correction unit configured to, when knocking containing a knocking vibration element that is equal to or greater than the knock judgment threshold value is detected by the knocking judgment unit, retard an ignition timing at a predetermined retardation speed, and while the knocking is not detected, gradually advance the ignition timing at a predetermined advance speed so as to approach a Maximum Brake Torque (MBT) point,
• wherein the ignition timing correction unit is configured to perform an ignition timing correction to target a first trace-knock state, and for a period from a time point when an accelerator opening is a full-open-equivalent opening or more to a time point when a predetermined catalyst protection control that increases a fuel injection amount to lower a catalyst temperature is started, to perform an ignition timing correction to target a second trace-knock state in which the ignition timing is controlled to an advanced side as compared with that in the first trace-knock state.