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:
Apr. 03, 2001
Filed:
Nov. 25, 1998
Akio Mizutani, Nagoya, JP;
Teppei Okawa, Kounan, JP;
Hiroshi Isomura, Komaki, JP;
Hiroshi Kubota, Wako, JP;
Seiichi Hosogai, Wako, JP;
Hiroyuki Fujita, Wako, JP;
Other;
Abstract
There is disclosed an oxygen sensor disposed before an exhaust gas purifying catalyst of an engine which uses a hydrocarbon containing fuel with a H/C ratio of three or more. An oxygen sensor,is provided with a solid electrolytic body,which can generate a difference in oxygen concentration with reference gas and measured gas, a reference electrode,and a detection electrode,formed on inner and outer surfaces of the solid electrolytic body,, and a porous protective layer,for covering the detection electrode,. The detection electrode,is formed only of a metal like Pt which promotes oxidizing reaction of methane to have a thickness of 1 to 2 &mgr;m. In the protective layer,, only a second protective layer,carries Pt catalyst,which promotes oxidizing reaction of hydrogen, and the amount of carried catalyst is in the range of 0.5 to 7 mol % relative to the whole of the second protective layer,. According to the oxygen sensor,, even if a large amount of hydrogen is exhausted, for example, from CNG engine, or even if a large amount of methane is exhausted, an excellent engine control can be realized.