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:
Sep. 20, 1988
Filed:
Mar. 09, 1987
Fumio Yukawa, Yokosuka, JP;
Masayuki Touda, Yokosuka, JP;
Shinji Kimura, Yokosuka, JP;
Fumio Munakata, Yokosuka, JP;
Satoru Ichikawa, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An air/fuel ratio sensor has an oxygen sensor cell including a primary measuring element in direct contact with a gas such as exhaust gases of an automotive engine, and an oxygen pump cell formed by inner and outer electrodes and a cover of an oxygen ion conductive solid electrolyte which confines the primary measuring element within a gas diffusion control space, and which has a small gas diffusion hole. The primary measuring element is formed with a central opening whose center lies right below the gas diffusion hole, in order to reduce a burden imposed on the oxygen pump cell and prevent overshoot in a sensor response characteristic. The oxygen sensor cell may be composed of the primary measuring element of a transition metal oxide connected with a pair of electrodes for measurement of an electrical resistance of the primary element, or may be composed of an oxygen ion conductive solid electrolyte substrate sandwiched between a reference electrode and the primary measuring element which serves as a measuring electrode.