The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 1978
Filed:
Apr. 15, 1977
Applicant:
Inventor:
David S Howarth, Rochester, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
123 / ; 1231 / ; 204 15 ; 2041 / ; 60276 ; 429 33 ;
Abstract
Apparatus and method for controlling internal combustion engine air to fuel ratios that includes a solid oxide electrolyte galvanic-type exhaust gas sensor. The sensor electrolyte is doped to have a significant internal thermally varying electronic conductivity, that materially reduces variation in sensor output voltage with variations in temperature. A dopant such as iron oxide provides substantially complete temperature compensation of the output voltage at sensor operating temperatures above about 450.degree. C.