Knock detection device and knock detection system diagnosis device

A knock detection system diagnosis device comprising:

• a knock signal output means for outputting an output signal of which waveform is varied according to a knock vibration caused while the internal combustion engine is operated;
• a multiple-frequency-ranges vibration intensity extraction means for extracting time-varying patterns of vibration intensities in multiple frequency ranges from the output signal of the knock signal output means;
• and
• a diagnosis means for evaluating a correlation between the time-varying patterns of vibration intensities in multiple frequency ranges and a reference model expressing a feature of the knock, the time-varying patterns of vibration intensity being extracted by the multiple-frequency-ranges vibration intensity extraction means during a period in which the internal combustion engine is operated under an operating condition in which knock is caused or during a period in which an ignition timing is advanced to compulsorily cause a knock, the diagnosis means determining whether the knock signal output means is faulty on the basis of the correlation.

A knock detection system diagnosis device comprising:

• a knock signal output means for outputting an output signal of which waveform is varied according to a knock vibration caused while the internal combustion engine is operated;
• a multiple-frequency-ranges vibration intensity extraction means for extracting time-varying patterns of vibration intensities in multiple frequency ranges from the output signal of the knock signal output means;
• and
• a diagnosis means for evaluating a correlation between the time-varying patterns of vibration intensities in multiple frequency ranges and a reference model expressing a feature of the knock, the time-varying patterns of vibration intensities being extracted by the multiple-frequency-ranges vibration intensity extraction means during a period in which a vibration noise is caused or during a period in which a vibration noise is compulsorily caused, the diagnosis means determining whether the knock signal output means is faulty on the basis of the correlation.

A knock detection system diagnosis device comprising:

• a knock signal output means for outputting an output signal of which waveform is varied according to a knock vibration caused while the internal combustion engine is operated;
• a multiple-frequency-ranges vibration intensity extraction means for extracting time-varying patterns of vibration intensities in multiple frequency ranges from the output signal of the knock signal output means;
• and
• a diagnosis means for evaluating a correlation between the time-varying patterns of vibration intensities in multiple frequency ranges and a reference model expressing a feature of an ignition noise, the time-varying patterns of vibration intensities being extracted by the multiple-frequency-ranges vibration intensity extraction means during a period in which the ignition noise is caused or during a period in which the ignition noise is compulsorily caused, the diagnosis means determining whether the knock signal output means is faulty on the basis of the correlation.

A knock detection system diagnosis device comprising:

• a knock signal output means for outputting an output signal of which waveform is varied according to a knock vibration caused while the internal combustion engine is operated;
• a multiple-frequency-ranges vibration intensity extraction means extracting vibration intensities in multiple frequency ranges from an output signal of the knock signal output means;
• and
• a diagnosis means for determining whether the knock signal output means is faulty on the basis of a vibration intensity of at least one frequency range among the vibration intensities in the multiple frequency ranges which are extracted by the multiple-frequency-ranges vibration intensity extraction means during a period in which any one of a knock, a vibration noise, and an ignition noise is caused or during a period in which any one of a knock, a vibration noise, and an ignition noise is compulsorily caused.