Engine-knock detection method and apparatus

Details Engine-knock detection method and apparatus Engine-knock detection method and apparatus

1981-08-20

1984-04-24

Goldberg, Gerald

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

044440421

ABSTRACT:
An amplitude envelope signal is derived from the output of an engine-knock sensor. Either the peak value of the envelope signal or its steepest rate of rise initiates the operation of a delay circuit providing a signal after a delay that is dependent upon the magnitude of the peak value or rate of rise. The envelope signal is also compared with a reference signal responsive to or representing or simulating background noise levels, and a comparison signal is produced when the envelope signal exceeds the reference signal. Engine-knock recognition is determined by the coincidence of the comparison signal and the delayed signal, and may be subjected also to a measurement window criterion which limits the appearance of an engine-knock signal to a particular arc of crankshaft revolution.

REFERENCES:
patent: 3218843 (1965-11-01), Lindsey
patent: 3678732 (1972-07-01), Arrigoni et al.
patent: 4276861 (1981-07-01), Kearney et al.
patent: 4337642 (1982-07-01), Yoshida
patent: 4344318 (1982-08-01), Dudeck et al.
patent: 4346586 (1982-08-01), Furrey

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