Knock detecting apparatus for internal combustion engine

Details Knock detecting apparatus for internal combustion engine Knock detecting apparatus for internal combustion engine

2007-07-17

2007-07-17

Williams, Hezron (Department: 2856)

Measuring and testing

Engine detonation

Specific type of detonation sensor

Reexamination Certificate

active

10866248

ABSTRACT:
A waveform knock signal detected by a knock sensor is filtered through a band-pass filter. The detected wave form signal is compared with an ideal reference knock waveform to determine an engine knock. The ideal reference knock waveform is derived on the basis of a factor depending on a crank angle, a factor depending on a real time and a factor depending on an engine construction. The factor depending on the real time is calculated based on an energy loss in a combustion chamber and a time constant of the band-pass filter. The factor depending on the engine construction is calculated based on a knock vibration which is generated in a cylinder, transferred to a cylinder block and detected by the knock sensor.

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