Measuring and testing – Gas analysis – Gas chromatography
Patent
1975-10-03
1977-01-25
Ruehl, Charles A.
Measuring and testing
Gas analysis
Gas chromatography
73 27R, 338 34, G01N 702, G01N 3100
Patent
active
040044521
ABSTRACT:
The present invention provides a sensor which is operative to sense the partial pressure of oxygen in the exhaust gases of combustion processes having air/fuel combustion mixture ratios in excess of the stoichiometric ratio. The sensor according to the present invention relies upon the direct and generally linear change in the logarithm of the resistance of cobalt monoxide ceramic material as a function of the partial pressure of oxygen in the environment of the sensor element at elevated temperatures for partial pressures of oxygen which coincide with the partial pressures of oxygen in the exhaust gases of fuel-lean combustion mixtures. The present invention provides a generally cylindrical cobalt monoxide ceramic sensor element, supported within a housing formed of a compatible ceramic material such as alumina, and arranged so that the change in the electrical resistance between the ends of the cylinder of the sensing element may be measured. When the sensor is situated within the exhaust system of a combustion device such as an internal combustion engine, the change in electrical resistance is a measure of the partial pressure of oxygen within the exhaust system and is also indicative of the air/fuel ratio of the combustion mixture which has produced the exhaust gases of the environment of the sensor. Such indication is usable to maintain the combustion mixture at a desired air/fuel ratio.
REFERENCES:
patent: 3539471 (1970-11-01), Sproul
patent: 3558280 (1971-01-01), Panson et al.
patent: 3611243 (1971-10-01), Hardtl
patent: 3623364 (1971-11-01), Withrow
patent: 3695848 (1972-10-01), Taguchi
patent: 3738341 (1973-06-01), Loos
patent: 3933028 (1976-01-01), Laud et al.
Laud Kamlakar R.
Logothetis Eleftherios M.
Park Kwansuh
Benziger Robert A.
Ford Motor Company
Ruehl Charles A.
Zerschling Keith L.
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