Patent ID: 6561163
Filing Date: 2003-05-13
Classification: F02D,F02P,Y02T

Abstract:
A knock control system for an internal combustion engine, comprising:knock detection means for evaluating an ionic current generated at a time of combustion of an air-fuel mixture in an internal combustion engine to output a knock detection signal; threshold value setting means for setting a threshold value for use in a knock judgement performed on the knock detection signal; knock judgement means for performing the knock judgement based on the threshold value and on the knock detection signal; control parameter correction request amount setting means for setting a control parameter correction request amount that includes at least ignition timing, based on the knock judgement result; control parameter correction means for setting the control parameter correction amount based on the control parameter correction request amount to correct the control parameter; and variation correction means for performing a correction to reduce variation exhibited by a cylinder in a case where at least one of the knock detection results and the control parameter correction amounts exhibits great variation with respect to those of other cylinders.