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:
Sep. 25, 2007
Filed:
Jun. 02, 2005
Yuji Kosaka, Obu, JP;
Yuji Kosaka, Obu, JP;
Denso Corporation, Kariya, JP;
Abstract
A DPF is used in an internal combustion engine for trapping PM discharged from an engine body. Presence and absence of an abnormality in the DPF is evaluated using differential pressure, which is between the front and the rear of the DPF. The differential pressure considerably decreases or considerably increases due to breakage or plugging of the DPF in an exhaust emission control device. The abnormality in the DPF is evaluated when a large deviation arises between a PM amount calculated in accordance with differential pressure, which is between the front and the rear of the DPF, and a PM amount calculated through integration of a PM discharge amount measured in accordance with an engine operating state. Thereby, presence and absence of the abnormality such as plugging and breakage in the DPF can be correctly detected.