Optical shaft position and speed sensor

Details Optical shaft position and speed sensor Optical shaft position and speed sensor

1988-05-19

1989-09-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534, H01J 516

Patent

active

048662690

ABSTRACT:
A fiber optic detector head senses a light reflective or transmissive pattern on an encoder disk rotated by an engine shaft. The pattern results in four different light levels which are translated by a detector into an electrical pulse train having four different voltages including a reference or background voltage. One light level is reserved for an index mark, another level for cylinder position marks and still another level for finer measurement of position and speed between the cylinder marks. Patterns encoded into the single pulse train are decoded by a microprocessor to provide specific engine cylinder position information as well as engine speed information.

REFERENCES:
patent: 3418989 (1968-12-01), Silverman
patent: 3719177 (1973-03-01), Oishi et al.
patent: 3757755 (1973-09-01), Carner
patent: 4146001 (1979-05-01), McCarthy et al.
patent: 4451731 (1984-05-01), Leonard
patent: 4604725 (1986-08-01), Davies et al.
patent: 4668862 (1987-05-01), Waibel

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