Spectral misfire detection system and method therefor

Details Spectral misfire detection system and method therefor Spectral misfire detection system and method therefor

1992-12-28

1995-02-07

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

053872533

ABSTRACT:
A system, and corresponding method, for detecting the presence of a misfire condition by interpreting spectral activity of a running engine includes a device (309, 313) for measuring a characteristic, preferably an acceleration characteristic indicative of the running engine's performance, A spectral discrimination device (319), preferably a digital filter, receives a composite signal (317) provided by the measuring device (309, 313). The digital filter (319) provides a normal firing signal (321), corresponding to spectral energy attributable to a portion of the composite signal (317) representative of a normal firing condition in the running engine, and a misfire signal (323), corresponding to spectral energy attributable to another portion of the composite signal (317) representative of a misfiring condition in the running engine. A comparison device (325) provides and indication of a misfire condition (327) when a magnitude of the misfire signal (323) exceeds a magnitude of the normal firing signal (321).

REFERENCES:
patent: 3908366 (1975-09-01), Masaki
patent: 3924457 (1975-12-01), Oshima et al.
patent: 4083234 (1978-04-01), Aono et al.
patent: 4357662 (1982-11-01), Schira et al.
patent: 4372269 (1983-02-01), Coles
patent: 4380800 (1983-04-01), Wilkinson
patent: 4424709 (1984-01-01), Meier, Jr. et al.
patent: 4438647 (1984-03-01), Ozaki et al.
patent: 4697561 (1987-10-01), Citron
patent: 4766863 (1988-08-01), Fujimori
patent: 4932379 (1990-06-01), Tang et al.
patent: 4936277 (1990-06-01), Deutsch et al.
patent: 5044194 (1991-09-01), James et al.
patent: 5044195 (1991-09-01), James et al.
patent: 5076098 (1991-12-01), Miwa
patent: 5088318 (1992-02-01), Osawa
patent: 5095742 (1992-03-01), James et al.
patent: 5105181 (1992-04-01), Ross
patent: 5109695 (1992-05-01), James et al.
patent: 5200899 (1993-04-01), Ribbens et al.
patent: 5239473 (1993-08-01), Ribbens et al.
Methods of On-Board Misfire Detection; Gunther Plapp, Martin Klenk, Winfried Moser, Robert Bosch GmbH, 900232.
Diagnosis of Individual Cylinder Misfires by Signature Analysis of A Pcrankshaft Speed Fluctuations; G. Rizzoni, University of Michigan Vehicular Electronics Lab, Copyright 1989 Society of Automotive Engineers, Inc. 890884.
SAE the Engineering Resource for Advancing Mobility, International Congress and Exposition Detroit, Mich. Feb. 24-28, 1986, 860028.
Digital Filters; Analysis and Design, Copyright 1979 by McGraw-Hill, Inc. Library of Congress Cataloging in Publication Data.

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