Knock detector using optical fiber thermometer

Details Knock detector using optical fiber thermometer Knock detector using optical fiber thermometer

1991-02-19

1992-03-31

Chapman, John E.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

050996819

ABSTRACT:
A knock detector for an internal combustion engine includes a pair of optical fiber thermometers that sense variations in heat flow within an engine cylinder. Each optical fiber thermometer includes a black body emitter disposed inside the cylinder which is heated by combustion gases to provide an optical output. The optical output is converted to an electrical signal which is analyzed to determine the relative time of arrival of a flame front at each thermometer, from which may be determined the speed of travel of the flame front between the thermometers and thereby whether a knock condition exists.

REFERENCES:
patent: 4265206 (1981-05-01), Garcea
patent: 4308519 (1981-12-01), Garcea et al.
patent: 4393687 (1983-07-01), Muller et al.
patent: 4576486 (1986-03-01), Dils
patent: 4750139 (1988-06-01), Dils
R. Dils, "An Introduction to Optical Fiber Thermometer Measurements in Automotive Engines", Accufiber Application Note, No. AN EAS100-A1, Feb. 1988, reprint from Advances in Instrumentation, vol. 41.

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