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. 15, 2009
Filed:
Dec. 23, 2005
Takashi Shirakawa, Yokohama, JP;
Yasutaka Ishibashi, Yokohama, JP;
Hikari Todoroki, Fujisawa, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
A diesel particulate filter () which traps particulate matter and a NOx trap catalyst () which traps nitrogen oxides are installed in series in an exhaust passage () of a diesel engine (). A controller () calculates a particulate matter deposition amount in the diesel particulate filter () (S). The controller (), when the particulate matter deposition amount exceeds a first predetermined amount (PM), prevents sharp increase of the particulate matter deposition amount by prohibiting rich spike where the oxygen concentration of the exhaust gas is controlled to a value corresponding to a rich air-fuel ratio in order to regenerate the NOx trap catalyst () (S, S, S), and prevents the particulate matter deposition amount of the diesel particulate filter () from reaching a limit.