G - Physics – 01 – N
Patent
G - Physics
01
N
73/63
G01N 27/04 (2006.01)
Patent
CA 1127870
360-79-0300 TEMPERATURE COMPENSATED TITANIA TYPE OXYGEN SENSOR ABSTRACT A method and apparatus for obtaining an electrical signal which is a function of the 02 content of an exhaust gas of an internal combustion engine. The sensing element is comprised of two resistors, one of which is a zirconia resistor (1), the other of which is a titania resistor (2). Both resistors (1 and 2) 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 (2) also varies as a function of the oxygen content in the exhaust gas. The zirconia resistor (1) is in the feedback loop of an operational amplifier (3) while the titania resistor (2) is in the input circuit of the amplifier (3). Since the gain of the amplifier (3) will change as the ratio of the resistances of the titania resistor and zirconia resistor changes, for a given input, the output of the amplifier will be a function of the oxygen content in an exhaust gas and, hence, a function of the air to fuel ratio being supplied to an internal combustion engine.
352575
Bendix Autolite Corporation
Macrae & Co.
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