Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound
Patent
1995-10-27
1996-12-03
Bell, Bruce F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For oxygen or oxygen containing compound
2057845, 205775, 2057825, 204408, 204425, 204426, 204427, 204429, 123672, 123674, 123676, 123677, 123693, 123694, 123510, 123511, 73 2321, 73 2332, 73 3104, G01N 2726
Patent
active
055804403
ABSTRACT:
A method and apparatus are disclosed for measuring atmospheric pressure in conjunction with an air-fuel ratio sensor of the type comprising a concentration cell with atmospheric air and exhaust electrodes on opposite sides of a solid-state electrolyte having oxygen ion conductivity. During an atmospheric pressure measuring cycle, oxygen ions are pumped from the atmospheric air electrode to the exhaust electrode, in a quantity which is either predetermined at a fixed value, or is sufficient to bring the cell to an equilibrium state. Atmospheric pressure is then calculated from measured emf of the cell, using an experimentally derived functional relationship. In a second embodiment, ions are pumped until a predetermined change of the concentration cell emf is achieved, and atmospheric pressure is determined based on the amount of time required to achieve such change. The atmospheric pressure measuring mode is operated on a time shared basis with the air-fuel ration detection mode.
REFERENCES:
patent: 4419211 (1983-12-01), Brauer
patent: 4753209 (1988-06-01), Hibino et al.
patent: 4915814 (1990-04-01), Harada et al.
patent: 5035226 (1991-07-01), Nishikawa et al.
Hasegawa Norio
Minami Naoki
Oouchi Shiro
Sato Kanemasa
Ueno Sadayasu
Bell Bruce F.
Hitachi , Ltd.
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