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. 20, 2005
Filed:
Feb. 20, 2003
Hisashi Kadowaki, Chita-gun, JP;
Syujiro Morinaga, Takahama, JP;
Yukihiro Yamashita, Takahama, JP;
Hideyuki Maeji, Okazaki, JP;
Hisashi Kadowaki, Chita-gun, JP;
Syujiro Morinaga, Takahama, JP;
Yukihiro Yamashita, Takahama, JP;
Hideyuki Maeji, Okazaki, JP;
DENSO Corporation, Kariya, JP;
Abstract
At a time point at which an ignition switch is made OFF and an engine is stopped, an output of a downstream gas sensor is read, thereafter, at a time point at which a predetermined time period has elapsed from stopping the engine, the output of the downstream gas sensor changed by flowing the atmosphere back into an exhaust pipe is read. Thereafter, a change in the output of the downstream gas sensor until the predetermined time period has elapsed from stopping the engine is calculated, the change in the output is compared with an abnormality determinant and when the change in the output is smaller than the abnormality determinant, response of the downstream gas sensor is determined to be abnormal.