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:
Nov. 22, 2005
Filed:
Mar. 03, 2004
Makoto Saito, Okazaki, JP;
Shigeto Yahata, Obu, JP;
Kazuharu Tochikawa, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
An amount ML of particles accumulated in small holes of a particulate filter is calculated in accordance with a pressure drop ΔP detected by a pressure sensor and a characteristic line. The characteristic line is defined by a first characteristic line and a second characteristic line, which is defined after exceeding a transition point TP. When the particles accumulated in the small holes are burned while remaining accumulated particles on the surface, the second characteristic line is shifted in a parallel fashion and compensated. Thus, the characteristic line is corrected so that the accumulation amount ML can be precisely calculated, even if particles accumulated in small holes are burned and the characteristic is changed.