Engine control system responsive to optical fuel composition sen

Details Engine control system responsive to optical fuel composition sen Engine control system responsive to optical fuel composition sen

1990-01-09

1990-12-04

Argenbright, Tony M.

Internal-combustion engines

Miscellaneous

Fuels, lubricants and additives

73 611R, 123494, 123575, 250343, 250574, F02M 4300, G01N 2100

Patent

active

049745522

ABSTRACT:
An engine control system for operating an internal combustion engine with any mixture of alcohol and gasoline. The control system includes an air/fuel ratio control system providing a desired fuel charge in relation to the alcohol and gasoline content of the fuel which is indicated by an optical sensor. In one embodiment, the optical sensor includes a hemispherical lens having hemispherical recesses formed through the lens base equidistant from the lens plane of symmetry. A light emitting diode positioned in one recess irradiates substantially the entire 2 .pi. steradian outer surface of the hemispherical lens. A portion of the transmitted light is reflected from substantially the entire hemispherical lens and substantially focused on a photodetector positioned in the other recess. Emitter and detector are substantially positioned at conjugate focii of the lens which provides substantially a 2 .pi. steradian collection aperture. The amount of transmitted light reflected is related to the index of refraction of the surrounding fuel mixture thereby providing a measurement of fuel composition.

REFERENCES:
patent: 3639770 (1972-02-01), Zizelmann
patent: 4438749 (1984-03-01), Schwippert
patent: 4594968 (1986-06-01), Degobert et al.
patent: 4706630 (1987-11-01), Wineland et al.
patent: 4770129 (1988-09-01), Miyata et al.

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