Method and apparatus for recognition of knocking in an internal

Details Method and apparatus for recognition of knocking in an internal Method and apparatus for recognition of knocking in an internal

1984-05-23

1986-01-21

Kreitman, Stephen A.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

045650870

ABSTRACT:
Engine knock sensor signals are amplified, band-pass filtered and rectified and then a sequence of integrated signal peak values are compared with reference signals relating to a typical engine knock signal. If the deviation of the integration values or peak values or their sum over a measurement period differs by less than a predetermined amount from the corresponding reference values, a knock indication is produced. The initial integration or peak value may be given less weight than those that follow. The knock sensor may be an engine block sound sensor, or a combustion chamber light, pressure or iron current sensor. Additional criteria, such as the interval between null transitions or signal maxima or the number of them in a measuring period may be used to inhibit a knock indication in case the main processing should occasionally provide an anomalous knock signal, but this precaution is not sufficiently needed to warrant its inclusion in simplified systems.

REFERENCES:
patent: 3942359 (1976-03-01), Arrigoni et al.
patent: 4133475 (1979-01-01), Harned et al.
patent: 4153020 (1979-05-01), King et al.
patent: 4418567 (1983-12-01), Boning et al.
patent: 4492108 (1985-01-01), van Zanten

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