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. 13, 2005
Filed:
Dec. 05, 2000
Ekkehard Pott, Gifhorn, DE;
Hermann Hahn, Hannover, DE;
Ulrich Goebel, Hattersheim, DE;
Juergen Hoehne, Hanau, DE;
Ekkehard Pott, Gifhorn, DE;
Hermann Hahn, Hannover, DE;
Ulrich Goebel, Hattersheim, DE;
Juergen Hoehne, Hanau, DE;
Volkwagen AG, Wolfsburg, DE;
OMG AG & Co. KG, Hanau, DE;
Abstract
A method for the desulfurization of an NOstorage catalyst arranged in an exhaust system of an internal combustion engine, whereby, for the desulfurization, the internal combustion engine is alternatingly operated in a lean mode at λ>1 and a rich mode at λ<1. During the desulfurization process, the present invention provides for the progress of the desulfurization being monitored, using a change in a parameter relating to intervals (I), whereby the interval (I) lasts from the beginning of an nrich operating phase (T), until the measured value drops below a predetermined lambda threshold value (S) downstream from the NOstorage catalyst (). Furthermore, the progress of the desulfurization is monitored, using a change in a lambda probe voltage (U) downstream from the NOstorage catalyst (), which is determined at the end of a predetermined interval at the beginning of an nrich operating phase (T).