Knocking control method for internal combustion engine and knocking control device

Abstract

A method of controlling knocking of an internal combustion engine has, when knocking having a knock judgment threshold value or more is detected, retard-correcting an ignition timing at a predetermined retardation speed, while the knocking is not detected, gradually advancing the ignition timing at a predetermined advance speed so as to approach an MBT point, performing an ignition timing correction for aiming for a first trace-knock state, and when an accelerator opening is a full-open-equivalent opening or more and also for a delay period until a predetermined catalyst protection increasing control is started, performing an ignition timing correction for aiming for a second trace-knock state in which the ignition timing is controlled to a relatively advance side as compared with that in the first trace-knock state.