Engine knock signal generating apparatus with noise channel inhi

Details Engine knock signal generating apparatus with noise channel inhi Engine knock signal generating apparatus with noise channel inhi

1977-11-07

1978-09-05

Gill, James J.

Measuring and testing

Engine detonation

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

G01N 3322, G01L 2322

Patent

active

041110358

ABSTRACT:
A vibration sensor mounted on an internal combustion engine characterized by knock-induced vibrations at a characteristic frequency and by other vibrations is tuned to resonate at substantially the characteristic frequency. A bandpass filter tuned to the characteristic frequency is connected to the vibration sensor output; and the output of the filter is provided to one input of a comparator and to average detector circuitry for generating a unidirectional noise reference signal representing noise at the characteristic frequency, which signal is provided to the other input of the comparator. The knock signal, obtained from the output of the comparator and comprising pulses corresponding to knock-induced peaks of amplitude greater than the unidirectional noise reference signal, is fed back through a low-pass filter to the average detector circuitry in sense to oppose increases in the unidirectional noise reference signal during said knock-induced peaks. The connection of the average detector circuitry to the output of the bandpass filter provides adaptability for mistuned sensors; and the negative feedback to the average detector circuitry reduces the distorting effect, amplified by the bandpass filter, of said knock-induced peaks on the unidirectional noise reference signal, which might otherwise distort the output knock signal.

REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 3950981 (1976-04-01), Arrigoni et al.
patent: 4012942 (1977-03-01), Harned

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