Method and apparatus for detecting knock in an internal combusti

Details Method and apparatus for detecting knock in an internal combusti Method and apparatus for detecting knock in an internal combusti

1991-04-24

1993-07-27

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 514

Patent

active

052303160

ABSTRACT:
A method and apparatus of detecting knocking in an internal combustion engine having a crankshaft uses a knock detecting sensor to detect vibration caused by knocking. The signals from the knock detecting sensor are detected between a first and a second moment of time (i.e. a measurement window) and at least one of the first and second moments of time are independently varied in dependence upon a vibration spectrum of frequencies to be detected. In a preferred embodiment a plurality of frequency spectra, each having a different first and second moment of time, are each separately analyzed for determining knock intensity. The moments of time are represented by first and second angles of the crankshaft. A plurality of measurement windows are advantageously used to determine the level of knocking and if the level exceeds a predetermined level the ignition timing for the engine is retarded. The frequency of maximum amplitude is arranged in operation to be the center frequency of a frequency spectrum determined by the measurement window.

REFERENCES:
patent: 4466406 (1984-08-01), Hartung
patent: 5005549 (1991-04-01), Pannpaindras et al.
patent: 5012782 (1991-05-01), Tokuda
patent: 5040510 (1991-08-01), Krabs et al.
patent: 5083278 (1992-01-01), Matsuura
patent: 5088044 (1992-02-01), Matsuura
Patents Abstracts of Japan, vol. 7, No. 117 (P-198)(1262) May 21, 1983 and JP-A-58 037 531 (matsushita) Mar. 4, 1983.
Patents Abstracts of Japan, vol. 8, No. 183 (P-296)(1620) Aug. 23, 1984 and JP-A-59 073 750 (Matsushita) Apr. 26, 1984.

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