KNOCKING DETERMINATION DEVICE FOR INTERNAL COMBUSTION ENGINE

• Main Authors: YUICHI TAKEMURA, MASATOMO YOSHIHARA, KENJI SENDA, KIYOSHI IWADE, KENJI KASASHIMA, KOJI ASO, SHUHEI OE, RIHITO KANEKO
• Format: Patent
• Language: English
• Published: 15.01.2010
• Subjects: MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; PHYSICS; TESTING

AN ENGINE ECD INCLUDES A BANDPASS FILTER (1) EXTRACTING ONLY VIBRATIONS AT A FIRST FREQUENCY BAND A, A BANDPASS FILTER (2) EXTRACTING ONLY VIBRATIONS AT A SECOND FREQUENCY BAND B, A BANDPASS FILTER (3) EXTRACTING ONLY VIBRATIONS AT A THIRD FREQUENCY BAND C, AND A BANDPASS FILTER (4) EXTRACTING ONLY VIBRATIONS AT A FOURTH FREQUENCY BAND D INCLUDING THE FIRST TO THIRD FREQUENCY BANDS A-C. THE ENGINE ECD 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.