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. 25, 2007
Filed:
Jul. 10, 2006
Tsutomu Hayashi, Anjo, JP;
Hajime Nomura, Okazaki, JP;
Yoshitaka Uematsu, Anjo, JP;
Toshiaki Iwashita, Kariya, JP;
Kensuke Mizui, Kariya, JP;
Tsutomu Hayashi, Anjo, JP;
Hajime Nomura, Okazaki, JP;
Yoshitaka Uematsu, Anjo, JP;
Toshiaki Iwashita, Kariya, JP;
Kensuke Mizui, Kariya, JP;
Denso Corporation, Kariya, Aichi-pref., JP;
Abstract
An element crack detecting apparatus for an oxygen sensor detects a sensor output voltage for an abnormality detection period after a fuel cut-off is started during operation of an engine. When the output voltage becomes negative, an abnormality counter is counted up. When the abnormality counter value reaches a determination value, it is determined that the element crack is present. The abnormality detection period is variably set in response to an engine rotational speed, an intake air quantity and the mixture state immediately before the fuel cut-off is effected. The determination value is variably set in response to the oxygen sensor temperature and the mixture state immediately before the fuel cut-off is effected. Further, the determination value is variably set in response to a magnitude of the negative voltage of the oxygen sensor.