Method and apparatus of detecting engine knocking

Details Method and apparatus of detecting engine knocking Method and apparatus of detecting engine knocking

1982-04-22

1984-06-26

Gill, James J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

G01L 2322

Patent

active

044558627

ABSTRACT:
An engine knocking detection method and apparatus which can accurately separate engine knocking vibration signals from background noise signals on the basis of the waveforms of the detected engine vibration signals. Usually, engine knocking vibration signals have frequency components of from 6 to 9 KHz and envelope time constants of from 1.5 to 50 ms. Therefore, the engine knocking detection apparatus according to the present invention comprises a band-pass filter (6-9 KHz), a first smoothing circuit which outputs only engine vibration signals with envelope time constants of 1.5 ms or more and a second smoothing circuit which outputs only background noise signals with time constants of 50 ms or more, in addition to a vibration sensor, amplifiers, a rectifier, and a comparator.

REFERENCES:
patent: 3247705 (1966-04-01), Wostl
patent: 4111065 (1978-09-01), West
patent: 4279143 (1981-07-01), Guipaud
patent: 4346586 (1982-08-01), Furrey
patent: 4384473 (1983-05-01), Brandt

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