Patent ID: 6748922
Filing Date: 2004-06-15
Classification: F02P,G01L,Y02T

Abstract:
A knock control apparatus for an internal combustion engine comprising:ionic current detection means for detecting an ionic current generated in a combustion chamber of the internal combustion engine immediately after ignition of an air fuel mixture therein; frequency magnitude calculation means for extracting the magnitude of a specific frequency from said ionic current; knock determination means for determining based on said specific frequency magnitude whether said internal combustion engine is knocking; and control parameter correction amount setting means for setting an amount of correction for an ignition timing control parameter based on the result of the determination of said knock determination means; wherein said frequency magnitude calculation means comprises: frequency magnitude detection means for detecting said specific frequency magnitude based on an output of said ionic current detection means; ionic current area calculation means for calculating an ionic current area in a prescribed range within the combustion stroke of a cylinder concerned based on the output of said ionic current detection means; and correction means for correcting said detected specific frequency magnitude based on the calculation result of said ionic current area calculation means.