| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for detecting knocking that detects knocking of an internal combustion engine with high accuracy. SOLUTION: The apparatus includes: a vibration detector for detecting vibration of a cylinder block of the internal combustion engine; a combustion pressure detector for detecting combustion pressure of the internal combustion engine; a first determiner for determining that knocking has occurred, when variations of detection values during a prescribed period of the vibration strength belonging to the frequency range that is particular to knocking, in the vibrations detected by the vibration detector, is larger than a prescribed first threshold; a second determiner for determining whether a vibration strength belonging to the frequency range that is particular to knocking, in the vibrations of combustion pressure detected by the combustion pressure detector, is larger than a prescribed second threshold; and a correction device for performing correction processing of lowering the first threshold, when performing two or more times of determination by the second determiner, and then the ratio of the number of determination result that the vibration strength of the combustion pressure in the two or more times of the determination is larger than the second threshold, is larger than a prescribed third threshold. COPYRIGHT: (C)2011,JPO&INPIT |
