Patent ID: 7624619

Claim:
A knocking detecting device for an internal combustion engine, comprising: a signal processing module for processing a signal attributable to knocking occurring in operation of the internal combustion engine, determining a knocking occurrence intensity, and for outputting a determination result to control a timing at which an ignition coil is actuated based on the knocking occurrence intensity determined by the signal processing module, to thereby control an ignition timing at which a fuel-air mixture within a combustion chamber is ignited so as to suppress the occurrence of knocking, wherein the signal processing module comprises: a signal detecting means for detecting the signal attributable to knocking that occurs in the operation of the internal combustion engine; a frequency intensity calculating means for selecting a plurality of frequencies extracted from an output of the signal detecting means and for calculating a frequency intensity of each of the selected frequencies; and a knocking intensity determining means for determining that knocking occurs only in a case where at least two primary determination results, from among respective primary knocking determination results obtained for each of the selected frequencies, based on outputs of the frequency intensity calculating means, indicate a possibility of knocking occurrence.