Knock detection system

Details Knock detection system Knock detection system

1988-03-02

1989-11-21

Chapman, John

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

048814016

ABSTRACT:
A knock detection system for an internal combustion engine comprises an input for receiving a signal from a vibration sensing transducer and two bandpass filters and connected to the input. A first bandpass filter passes a band of frequencies containing the characteristic knock frequency, so that it passes the knock-representing component together with noise. The second bandpass filter passes an adjacent band of frequencies having substantially no knock component content but a noise component corresponding to that passed by the first filter. The outputs of the two bandpass filters are referenced to each other (e.g. by rectifying their outputs on opposite polarities and summing) to cancel out the noise and provide a signal which represents the knock component included in the output from the vibration-sensing transducer.

REFERENCES:
patent: 3393557 (1968-07-01), Brown et al.
patent: 4329871 (1982-05-01), Grossner et al.
patent: 4343278 (1982-08-01), Asano
patent: 4467634 (1984-08-01), Rohde et al.
patent: 4523567 (1985-06-01), Iwata
L. J. Weber et al., Electrical Measurement Systems for Biological and Physical Scientists (Addison-Wesley, Reading, Mass.), 1975, pp. 328-330.

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