Internal combustion engine knock determination device

Details Internal combustion engine knock determination device Internal combustion engine knock determination device

2011-01-25

2011-01-25

Kwok, Helen C. (Department: 2856)

Measuring and testing

Engine detonation

Specific type of detonation sensor

Reexamination Certificate

active

07874200

ABSTRACT:
An engine ECU executes a program including the steps of: detecting a vibration corresponding to a first radial resonance mode by using a band-pass filter, from vibrations sensed by an in-cylinder pressure sensor provided at an upper central portion of the cylinder; calculating knock intensity N based on a result of comparison between the detected waveform and a knock waveform model prepared in advance as a vibration waveform when knocking occurs; determining that knocking occurred when the knock intensity N is larger than a predetermined reference value; and determining that knocking has not occurred when the knock intensity N is not larger than the predetermined reference value.

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