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:
Mar. 11, 2008
Filed:
Jun. 01, 2005
Applicants:
Johannes Ante, Regensburg, DE;
Christian Birkner, Irlbach, DE;
Wolfgang Östreicher, Regensburg, DE;
Inventors:
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Primary Examiner:
Int. Cl.
CPC ...
F01N 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A particle filter is monitored with a sequence of steps. A pressure loss at the particle filter is measured. The volumetric flow of exhaust gas is acquired and a filter load value is calculated from the pressure loss and the volumetric flow of exhaust gas. The filter load value is recorded as a function of a drive parameter and the filter load value is differentiated with respect to the drive parameter. The differentiation of the filter load allows a particle filter breakdown to be deduced when the differentiation is less than or equal to zero.