Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1984-03-02
1985-09-24
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
123489, 204408, 204425, G01N 2758
Patent
active
045431760
ABSTRACT:
An oxygen concentration detector under a temperature control for an internal combustion engine. An oxygen sensor of a critical current type is held between a gas under test and a reference gas, in the vicinity of which a heater is located for heating up the oxygen sensor in a sensor activating temperature range. A first voltage is applied for a positive bias control to the oxygen sensor during a first period, and a second voltage is applied for a negative bias control thereto during a second period. Electric current flowing through the oxygen sensor is detected during the first period in order to detect the oxygen concentration in the gas under test. The current value is also detected during the second period in order to detect and maintain constant the internal electric resistance of the oxygen sensor by controlling the heater heating output.
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patent: 4472262 (1984-09-01), Kondo et al.
Fracis Weston Sears et al., "College Physics", pp. 475-476, (1948).
Fujimoto Masaya
Harada Susumu
Harada Takashi
Honda Masakazu
Kobayashi Akio
Kaplan G. L.
Nippondenxo Co., Ltd.
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