Borderline spark knock detector

Details Borderline spark knock detector Borderline spark knock detector

1976-05-17

1977-03-22

Gill, James J.

Measuring and testing

Engine detonation

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

123117R, 1231465A, G01L 2322

Patent

active

040129420

ABSTRACT:
Spark knock in an internal combustion engine is detected by an accelerometer attached to the intake manifold which generates electrical signals representing inaudible background engine noise combined with knock. A signal proportional to engine speed is provided and a circuit responsive to the speed signal generates a background noise reference signal which is subtracted from the electrical signal therefore producing a knock intensity signal. That signal is in turn compared with another speed variable reference signal representing borderline knock level so that the resultant output is a signal representing the amount by which the knock intensity exceeds the borderline value. Each reference signal is generated by a diode function generator in response to the speed signal.

REFERENCES:
patent: 3950981 (1976-04-01), Arrigoni et al.

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