Method and apparatus for determining combustion mixture...

Details Method and apparatus for determining combustion mixture... Method and apparatus for determining combustion mixture...

G - Physics

01

N

324/25, 73/69

G01N 27/12 (2006.01) G01M 15/10 (2006.01) G01N 33/00 (2006.01)

Patent

CA 1089670

ABSTRACT OF THE DISCLOSURE 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 electro- chemical cell necessary to maintain this balance is a measure of the combustion mixture air/fuel ratio.

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