KNOCKING DETERMINATION DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An engine ECU (200) includes a bandpass filter (1) (410) extracting only vibrations at a first frequency band A, a bandpass filter (2) (420) extracting only vibrations at a second frequency band B, a bandpass filter (3) (430) extracting only vibrations at a third frequency band C, and a bandpass filter (4) (440) extracting only vibrations at a fourth frequency band D including the first to third frequency bands A-C. The engine ECU (200) determines whether knocking occurred or not based on a vibration waveform of the fourth frequency band D and a peak value in magnitude of vibrations in a synthesized waveform of the first to third frequency bands. ® KIPO & WIPO 2008