Patent ID: 6105552
Filing Date: 2000-08-22
Classification: F02D,F02P,G01L,Y02T

Abstract:
An abnormal combustion detection apparatus for an internal combustion engine, comprising:means for detecting knocking that occurs during combustion in the internal combustion engine;means for detecting an air-fuel ratio of a combustion gas;means for delaying an ignition timing when knocking is detected by the vibration detection means;means for determining whether knocking has been decreased by the delaying of the ignition timing performed when knocking is detected;means for comparing an air-fuel ratio detected before the delaying of the ignition timing to an air-fuel ratio detected after the delaying of the ignition timing; andmeans for determining that preignition has occurred when, despite the delaying of the ignition timing, the knocking has not decreased and the air-fuel ratio detected after the delaying of the ignition timing is less than the air-fuel ratio detected before the delaying of the ignition timing.