Method of detecting knock in internal combustion engines

Details Method of detecting knock in internal combustion engines Method of detecting knock in internal combustion engines

1991-08-15

1993-06-22

Chapman, John E.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

052208214

ABSTRACT:
To detect knock, a detected signal relating to a combustion property in a cylinder of an engine is generated. The detected signal (I) is filtered to select those portions characteristic of knock. However, the filtered signal (I') is only investigated to determine whether knock has occurred, when the unfiltered detected signal (I) meets at least two, and usually four, preset conditions. One preset condition is that the detected signal (I) must have reached a predetermined threshold value (I.sub.s). Other preset conditions for the detected signal include the following: that the maximum value (I.sub.max) of the detected signal (I) is below a predetermined critical value (I.sub.max crit) and that within a predetermined crank angle difference (.DELTA..alpha..sub.F), after reaching the threshold value (I.sub.s), during a predetermined time interval (.DELTA.t) the detected signal (I) does not decrease by more than a first critical amount (.DELTA.I.sub.AbC) and then does not rise by more than a second critical amount (.DELTA.I.sub.AnC).

REFERENCES:
patent: 3678732 (1972-07-01), Arrigoni et al.
patent: 4565087 (1986-01-01), Damson et al.
patent: 4762106 (1988-08-01), Blauhut

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