Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1993-12-01
1995-04-11
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204406, 204408, 204427, 204429, G01N 2726
Patent
active
054055210
ABSTRACT:
An oxygen concentration measuring device capable of significantly shortening the period of time during which oxygen concentration cannot be measured. When measuring the temperature of a sensor main body, a microcomputer determines the temperature of the sensor main body by estimating a saturation current starting from a current detected by a current detecting circuit in a period of time before current flowing through the sensor main body finishes rising, after the sensor main body has been negatively biased by a bias control circuit. The sensor main body is positively biased by the bias control circuit directly after the period of time has lapsed. The microcomputer determines an air fuel ratio by using current in a period of time before current flowing through the sensor main body due to the positive bias finishes decreasing.
REFERENCES:
patent: 4543176 (1985-09-01), Harada et al.
Isomura Shigenori
Mizoguchi Tomomichi
Nakamori Yasutaka
Suzumura Toshihiro
Bell Bruce F.
Niebling John
Nippondenso Co. Ltd.
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