Engine with knock sensing using product component of knock vibra

Details Engine with knock sensing using product component of knock vibra Engine with knock sensing using product component of knock vibra

1982-05-19

1984-01-10

Gill, James J.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

044247060

ABSTRACT:
An engine subject to knock induced vibrations of at least two characteristic knock frequencies and noise vibrations processes the output of a vibration sensor in, for example, a square law device to generate a product component only when vibrations occur simultaneously at both characteristic knock frequencies. The amplitude of the product component is proportional to the product of the amplitudes of the two characteristic knock frequency components for an improved signal to noise ratio; and the frequency of the product component is equal to the difference of the characteristic knock frequencies. A band pass filter passes the product component to further signal processing apparatus including a comparator which generates a knock signal when the amplitude exceeds a reference. The knock signal may be used in a closed loop system to control knock in the engine.

REFERENCES:
patent: 4290301 (1981-09-01), Yamaguchi et al.
patent: 4345558 (1982-08-01), Yamaguchi et al.
patent: 4364260 (1982-12-01), Chen et al.

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