Method and apparatus for determining combustion mixture air/fuel

Details Method and apparatus for determining combustion mixture air/fuel Method and apparatus for determining combustion mixture air/fuel

1977-11-21

1978-11-14

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

73 27R, 422 98, G01N 2712

Patent

active

041253744

ABSTRACT:
A wide range combustion mixture air/fuel ratio sensor in which an electrochemical cell supplies hydrogen gas to a palladium sensor element at a rate regulated by the output of a Wheatstone bridge circuit incorporating the sensor element. This generated hydrogen gas combines with any oxygen present in the exhaust gas through catalytic action and also maintains the level of absorbed hydrogen, and therefore the electrical resistance of the palladium sensor element, at a preselected value. The magnitude of the current applied to the electrochemical cell necessary to maintain this balance is a measure of the combustion mixture air/fuel ratio.

REFERENCES:
patent: 3138948 (1964-06-01), Pfefferle
patent: 3149921 (1964-09-01), Warner
patent: 3242717 (1966-03-01), Matle et al.
patent: 3933028 (1976-01-01), Laud et al.
patent: 3948081 (1976-04-01), Wessel et al.
patent: 4025412 (1977-05-01), Laconti

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