Engine knock control with detector and filter

Details Engine knock control with detector and filter Engine knock control with detector and filter

1981-08-24

1983-05-24

Gill, James J.

Measuring and testing

Engine detonation

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

G01L 2322, F02P 504

Patent

active

043844731

ABSTRACT:
A spark ignited internal combustion engine includes apparatus effective to generate a signal from knock-induced and other ringing vibration bursts with amplification over a wide passband around the characteristic knock frequency. The signal is demodulated to obtain the envelope pulses of the knock and other vibration bursts and filtered in a low pass filter having a half power frequency from 60-200 Hertz. The output of this filter, in which other pulses are significantly attenuated with respect to knock pulses, is further processed to obtain a knock control signal which controls spark retard apparatus to limit knock intensity.

REFERENCES:
patent: 2678997 (1954-05-01), Darlington
patent: 3252093 (1966-05-01), Lerner
patent: 4106447 (1978-08-01), West
patent: 4111035 (1978-09-01), West et al.
EPA paper 460-3-78-009 pp. 26, 27, 60, 61, 66-74, 80, 81 Sep. 1978.

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