Electrical resistors – Resistance value responsive to a condition – Gas – vapor – or moisture absorbing or collecting
Patent
1979-01-22
1980-09-09
Albritton, C. L.
Electrical resistors
Resistance value responsive to a condition
Gas, vapor, or moisture absorbing or collecting
73 27R, 324 65P, 338229, H01L 700
Patent
active
042220262
ABSTRACT:
An improved exhaust gas sensor of the type having first and second titania ceramic elements which have electrical resistances varying as a function of both the temperature and the composition of exhaust gases from internal combustion engines to which the elements are exposed. The first and second titania elements are connected in series circuit in the utilization of the sensor and the resistance of the second element over the operating temperature range of the exhaust gas sensor compensates the signal of the first titania element in a manner that produces a desired signal. The desired signal is a result of variation of the second titania element resistance values when exhaust gases cycle between lean-mixture and rich-mixture compositions. The resistance values of the second titania element are intermediate the corresponding resistances of the first titania element over the temperature range.
The second titania element is more dense than the first titania element. It has a density in the range from 3.2 g/cm.sup.3 to 3.8 g/cm.sup.3, i.e., between about 76% and 90% of theoretical density.
REFERENCES:
patent: 3639132 (1972-02-01), Egerton et al.
patent: 3886785 (1975-06-01), Stadler et al.
patent: 3932246 (1976-01-01), Stadler et al.
patent: 4007435 (1977-02-01), Tien
Green Wells L.
Heiney, III Elmer T.
Merchant Stanley R.
Albritton C. L.
Brown Robert W.
Ford Motor Company
Sadler Clifford L.
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