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:
Apr. 01, 2014
Filed:
May. 16, 2011
Hirotaka Takahashi, Fujisawa, JP;
Yoshinori Hamaguchi, Fujisawa, JP;
Takanobu Ogawa, Fujisawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A competence diagnosis system for a urea water temperature sensor that can limit a diagnosis during a cold start. The system includes a cold start condition determination unit that obtains a difference between an engine cooling water temperature and an ambient temperature, a difference between an engine cooling water temperature and a fuel temperature, and a difference between an ambient temperature and a fuel temperature by using an engine cooling water temperature, an ambient temperature, and a fuel temperature measured immediately after engine starting, and allows a diagnosis by the competence diagnosis unit when the temperature differences are less than or equal to a predetermined threshold value.