Patent ID: 7653477

Claim:
A device for controlling ignition timing of an internal combustion engine, comprising: means for calculating knock magnitude related to magnitude of vibration due to knocking, based on magnitude of vibration occurring in said internal combustion engine; means for controlling ignition timing of said internal combustion engine, based on a result of comparison between said knock magnitude and a predetermined determination value; detecting means for detecting a magnitude value related to the magnitude of vibration occurring in said internal combustion engine; operation means for performing an operation used for determining a knocking occurrence state, based on said magnitude value, determining means for determining the knocking occurrence state, based on a result of said operation by said operating means, correcting means for correcting said determination value, based on a result of said determination by said determining means; and stopping means for, when a predetermined condition is satisfied, stopping correction of said determination value, wherein said operating means includes means for continuously performing said operation, in a state where correction of said determination value is stopped by said stopping means.