Method and apparatus for detecting knock in a spark ignition eng

Details Method and apparatus for detecting knock in a spark ignition eng Method and apparatus for detecting knock in a spark ignition eng

1983-08-12

1986-04-29

Levy, Stewart J.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

045848696

ABSTRACT:
Transducers 16 detect local vibration of the engine and the signals therefrom can be compared using coherence or correlation functions in the region of the knock frequency to ascertain if the source of the vibrations is the same, indicating knock, or different, indicating random vibration. Two transducers spaced apart can be used, or one can measure cylinder pressure. Alternatively, one sensor could be used, using two signals delayed with respect to each other in time.

REFERENCES:
patent: 4289102 (1981-09-01), Katsumata et al.
patent: 4355534 (1982-10-01), Roger
patent: 4356551 (1982-10-01), Iwase et al.
patent: 4388902 (1983-06-01), Latapie
Patents Abstracts of Japan, vol. 6, No. 112 (p. 124), Jun. 23, 1982 & JP-A-57 42821 (Nissan Jidosha KK) 10-03-1982.
Prof. Dr. Ing. F. H. Lange, "Korrelations Elektronik", 1959, VEB Verlag, Berlin, DE; PP57061, p. 99, FIG. 3.1, p. 189, lines 22-38.
J. Darricau, "Physique et Theorie du Radar", vol. 2, 1973, edited by Sodipe, Paris, FR: pp. 180-183, para. 3.1.
M. J. Crocket et al., "Modeling of Diesel Engine Noise Using Coherence", 1979, pp. 155-165, Soc. of Auto. Engineers, Inc.
Elektronik, vol. 21, No. 8, Aug. 1972, pp. 275-278, L. J. Chamberlain, "Die Zeitreihenanalyse".

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