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:
Nov. 23, 2010
Filed:
Oct. 10, 2007
Toshihiro Aono, Abiko, JP;
Takahumi Ohwada, Tokyo, JP;
Akira Kiyomura, Takasaki, JP;
Masanobu Ohsaki, Maebashi, JP;
Seiichi Ohtani, Maebashi, JP;
Shigeo Ohkuma, Isesaki, JP;
Toshihiro Aono, Abiko, JP;
Takahumi Ohwada, Tokyo, JP;
Akira Kiyomura, Takasaki, JP;
Masanobu Ohsaki, Maebashi, JP;
Seiichi Ohtani, Maebashi, JP;
Shigeo Ohkuma, Isesaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A deterioration diagnosis system for an air fuel sensor mounted to an exhaust pipe of an internal combustion engine. The air fuel sensor determines a mixture ratio of air and fuel fed into the internal combustion engine. In the system, an inclination of an output signal of the air-fuel ratio sensor is calculated; variance of the inclination is calculated; deterioration of the air-fuel ratio sensor is determined based on the variance of the inclination.