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:
Oct. 16, 2007
Filed:
Feb. 24, 2005
Masahiko Emi, Yokosuka, JP;
Manabu Miura, Zushi, JP;
Masahiko Emi, Yokosuka, JP;
Manabu Miura, Zushi, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
A filter () traps particulate matter contained in the exhaust gas of a diesel engine (). The filter () is regenerated by burning the trapped particulate matter through an operation to raise the exhaust gas temperature. An oxidation catalyst which promotes combustion of the particulate matter is coated onto the filter (). The oxygen concentration of the exhaust gas upstream of the filter () and the oxygen concentration of the exhaust gas downstream of the filter () during the regeneration period are detected using universal exhaust gas oxygen sensors (). A controller () determines a substantial regeneration period on the basis of the difference between these oxygen concentrations, and by comparing a maximum value of the difference between the oxygen concentrations during the substantial regeneration period with a predetermined threshold, determines deterioration of the filter () with a high degree of precision.