Electrical resistors – Resistance value responsive to a condition – Gas – vapor – or moisture absorbing or collecting
Patent
1984-03-26
1985-08-13
Envall, Jr., Roy N.
Electrical resistors
Resistance value responsive to a condition
Gas, vapor, or moisture absorbing or collecting
73 23, 73 27R, 422 94, 422 98, G01N 2746, G01N 2712, H01L 700
Patent
active
045353166
ABSTRACT:
A heated resistive type sensor (20) for detecting the oxygen content in an exhaust gas is connected to an electronic control unit (22) for regulating the air/fuel ratio used to operate an internal combustion engine (10). The sensor (20) has a heater (70) which provides a constant thermal energy level to a titania sensing element (76) whose resistance to the flow of electrical current is directly related to the percentage of oxygen in the exhaust gas. The electrical resistance is used as a control signal to maintain the air/fuel ratio within set limits. The resistive portion consists of three resistive elements, one that senses O.sub.2 that is made of titania - TiO.sub.2, the other two resistors are thick film type connected in series thereto. Finally, the gas sensing layer and electrode leads attached thereto are covered by a protective glass layering to prevent contamination of the sensor element.
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Logothetis et al., "TiO.sub.2 Film Oxygen Sensors Made by CVD from Organometallics", Sensors and Actuators, vol. 4, (1983), pp. 333-340.
Becker Paul C.
Libsch Thomas A.
Pfeifer Jerome L.
Wertheimer Harry P.
Allied Corporation
Decker Ken C.
Envall Jr. Roy N.
McCormick Jr. Leo H.
Sears C. N.
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