Knock detector using optical fiber thermometer

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

1989-01-03

1991-10-01

Chapman, John E.

Measuring and testing

Engine detonation

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

36443108, G01L 2322

Patent

active

050522140

ABSTRACT:
A knock detector for an internal combustion engine includes an optical fiber thermometer that senses variations in heat flow within an engine cylinder. The 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 whose fourier components are analyzed to determine whether a knock condition exists.

REFERENCES:
patent: 4364260 (1982-12-01), Chen et al.
patent: 4393687 (1983-07-01), Muller et al.
patent: 4424706 (1984-01-01), Oh
patent: 4437334 (1984-03-01), Laurenz
patent: 4446723 (1984-05-01), Boning et al.
patent: 4576486 (1986-03-01), Dils
patent: 4750139 (1988-06-01), Dils
"Optical Fiber Thermometer Measurements in Automotive Engines," by R. R. Dils and M. P. Moore, Reprint dated Feb. 1988 from Advances in Instrumentation, vol. 41.

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