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:
Jul. 30, 2013
Filed:
Jun. 07, 2007
Daisuke Shibata, Numazu, JP;
Hiroshi Sawada, Gotenba, JP;
Keisuke Fukuoka, Shizuoka, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
An object of the present invention is to provide a technology that enables detection of a fault of a PM trapper with improved accuracy. In the present invention, a pressure sensorthat measures a differential pressure across a PM trapperis provided, and a fault of a PM trapper is determined based on an amount of change in the differential pressure across the PM trapperbetween two different operation states of an internal combustion enginein which the ambient temperature around the pressure sensorfalls within a specific temperature range. Since variations in the offset error of the differential pressure sensorcaused by changes in the ambient temperature around the differential pressure sensoris made small, the amount of change in the differential pressure across the PM trappercan be measured more accurately, and a fault of the PM trappercan be detected with improved accuracy.