Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1993-07-01
1995-02-14
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204426, 204427, 324470, 123438, G01N 2726
Patent
active
053892240
ABSTRACT:
A sensor for determining the stoichiometric air to fuel ratio (A/F) at the intake of an internal combustion engine is based on a capacitive device in the exhaust stream which can be used to measure the change in the workfunction of an appropriate material which occurs at the stoichiometric point and which forms one of the two interacting elements of the capacitor. To measure A/F over an extended range about stoichiometry the material whose workfunction changes is made the working electrode of an oxygen concentration cell using a solid electrolyte. Oxygen pumping to and from that surface can change the magnitude of the workfunction allowing for a feedback control method for keeping the workfunction constant despite changes in the A/F so that the required pump current becomes a measure of the A/F.
REFERENCES:
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patent: 4381224 (1983-04-01), Fate
patent: 4629549 (1986-12-01), Kojima
patent: 4729824 (1988-03-01), Giner
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patent: 5275712 (1994-01-01), Hetrick et al.
SAE Paper 860409 Wide-Range Au-Fuel Ratio Sensor (Feb. 1986).
Abolins Peter
Bell Bruce F.
Ford Motor Company
May Roger L.
Niebling John
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