Knocking determination device for internal combustion engine

Details Knocking determination device for internal combustion engine Knocking determination device for internal combustion engine

2006-06-21

2009-11-24

Raevis, Robert R (Department: 2856)

Measuring and testing

Engine detonation

Combustion signal compared to a fixed reference signal or...

Reexamination Certificate

active

07621172

ABSTRACT:
An engine ECU200includes a bandpass filter (1), a bandpass filter (2), and a bandpass filter (3). The bandpass filter (1) extracts only vibrations at a first frequency band A from the vibrations detected by a knock sensor. The bandpass filter (2) extracts only vibrations at a second frequency band B from the vibrations detected by the knock sensor. The bandpass filter (3) extracts only vibrations at a third frequency band C from the vibrations detected by the knock sensor. The first to third frequency bands A-C are identical in bandwidth. The engine ECU calculates a peak value in magnitude of vibrations in a synthesized waveform of these frequency bands, and determines whether knocking occurred or not based on the peak value.

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U.S. Appl. No. 11/475,993, filed Jun. 28, 2006, Yoshihara et al.

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