Device for judging knocking strength

Details Device for judging knocking strength Device for judging knocking strength

1980-07-17

1982-07-06

Gill, James J.

Measuring and testing

Engine detonation

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

123425, G01L 2322

Patent

active

043376428

ABSTRACT:
A device for judging knocking strength of an engine has a sensor (1) which detects pressure variations in a combustion chamber of the engine. A rectification circuit (3) rectifies the output of the sensor (1), the output of the rectification circuit (3) being smoothed by a smoothing circuit (4) to give the envelope waveform of the output of the sensor (1). The envelope waveform is differentiated by a differentiating circuit (5), the amplitude of the output of the differentiating circuit (5) being used to detect the knocking condition.

REFERENCES:
patent: 2508996 (1950-05-01), Elam
patent: 3576526 (1971-04-01), Arnold et al.
patent: 4153020 (1979-05-01), King et al.

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