Chemistry: electrical and wave energy – Processes and products
Patent
1985-02-19
1986-12-16
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204425, 204426, 204427, 204429, G01N 2746
Patent
active
046295356
ABSTRACT:
An air-fuel ratio detector including an oxygen ion conductive solid electrolyte, first and second electrodes provided on respective sides of the solid electrolyte, a porous diffusion resistor covering the first electrode, and a circuit arrangement for supplying a current between the first and second electrodes. In order to enable a detection of a wide range of air-fuel ratios, the current supplied between the first and second electrodes is controlled so as to feed oxygen from the second electrode to the first electrode through the solid electrolyte and then withdraw oxygen from the first electrode to the second electrode through the solid electrolyte. At the time of withdrawal of the oxygen, the mobility or migration of the oxygen is measured, with the mobility of the oxygen being detected in dependence upon a variation rate of a withdrawal current, an average value of the withdrawal current, or a time period from the starting time of the withdrawal to a time when the oxygen content near the first electrode has become nearly zero.
REFERENCES:
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4224113 (1980-09-01), Kimura et al.
patent: 4264425 (1981-04-01), Kimura et al.
patent: 4306957 (1981-12-01), Ishitani et al.
patent: 4440621 (1984-04-01), Kitahara et al.
Osuga Minoru
Oyama Yoshishige
Hitachi , Ltd.
Tung T.
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