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:
May. 30, 1989
Filed:
Mar. 11, 1988
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An oxygen sensor having a detecting element for detecting the concentration of oxygen contained in a subject gas. The subject gas reaches the detecting element through a carrier carrying a substance which adsorbs or desorbs the oxygen in the subject gas in accordance with the partial pressure of the oxygen. Thus, the detecting element is prevented from being corrupted by O.sub.2 or CO. Even though the oxygen sensor is temporarily exposed to excessive O.sub.2 or CO, therefore, the responsiveness of oxygen concentration detection to be effected thereafter is improved. Cerium oxide or lanthanum oxide may be suitably used as the oxygen adsorbing or desorbing material. The carrier may be pellets surrounding the oxygen detecting element, or a protective layer or a buffer layer formed on the surface of the detecting element. Alternatively, the carrier may be formed independently of the oxygen sensor so as to be disposed in an exhaust passage on the upper-course side of the oxygen sensor. The oxygen sensor of the present invention is adapted for use in an air-fuel ratio control apparatus of an internal combustion engine.