Method and apparatus for measuring the O.sub.2 content of a gas

Details Method and apparatus for measuring the O.sub.2 content of a gas Method and apparatus for measuring the O.sub.2 content of a gas

1979-09-19

1980-11-11

Serwin, R. E.

Chemistry: physical processes

Physical processes

Crystallization

73 27R, 123440, 324 65R, 422 90, 422 98, G01N 2704

Patent

active

042330335

ABSTRACT:
A method and apparatus for obtaining an electrical signal which is a function of the 0.sub.2 content of the exhaust gas of an internal combustion engine. Two resistors (1 and 3) are exposed to the exhaust gas of an internal combustion engine. Both resistors (1 and 3) have a resistance which varies as a function of the temperature of the exhaust gas to which it is exposed. However, the resistance of one of the resistors (1) also varies as a function of the oxygen content in the exhaust gas. Therefore, by applying a voltage to the resistors an electrical signal can be obtained which is a function of the O.sub.2 content of the exhaust gas, with the temperature effect of the exhaust gas on the network output being minimized or eliminated. The resistors (1 and 3) that form the sensing elements (10) are connected in series to other resistors to form a first and second resistor network which is connected together in parallel circuit relationship.

REFERENCES:
patent: 3558280 (1971-01-01), Pansonet al.
patent: 3915135 (1975-10-01), Kushida et al.
patent: 4147513 (1979-04-01), Bienkowski et al.
patent: 4151503 (1979-04-01), Cermak et al.
Esper et al., "Titania Exhaust Gas Sensor for Automotive Applications", SAE/SP-79/441, 1979 Soc. of Auto. Eng., Inc.

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