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. 10, 2009
Filed:
Nov. 14, 2006
Norbert Breuer, Ditzingen, DE;
Andreas Genssle, Musberg, DE;
Frank Ilgner, Stuttgart, DE;
Peter Riegger, Stuttgart, DE;
Markus Gloeckle, Stuttgart, DE;
Ralf Wegst, Gaggenau, DE;
Thorsten Raatz, Schwieberdingen, DE;
Norbert Breuer, Ditzingen, DE;
Andreas Genssle, Musberg, DE;
Frank Ilgner, Stuttgart, DE;
Peter Riegger, Stuttgart, DE;
Markus Gloeckle, Stuttgart, DE;
Ralf Wegst, Gaggenau, DE;
Thorsten Raatz, Schwieberdingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a procedure for controlling the reducing agent in an exhaust gas post-processing system of a combustion machine with an exhaust gas duct, in which an SCR catalytic converter is provided in the direction of flow of the exhaust, wherein a reducing agent generation system has an NOand CO/Hgeneration unit,, an oxidation catalytic converter and a combined NOstorage / ammonia generation unit in the standard gas route of the reducing agent generation system, and, in order to reduce nitrogen oxide, ammonia is added as a reducing agent in front of the SCR catalytic converter by the reducing agent generation system, wherein source materials for the generation of ammonia are at least intermittently added to the NOand CO/Hgeneration unit via a fuel supply line and via an air supply line, wherein during the fat phase the air/fuel composition is changed in front of the oxidation catalytic converter in the form of a lambda modulation for a lambda value. It can thus be achieved that, in pulse mode, a high H/CO yield can be achieved with a simultaneously low HC slip and the higher HC penetrations associated with the natural aging of the catalytic converter and the decreasing H/CO yields are compensated. Influences resulting from the reactor geometry of the oxidation catalytic converter can be influences or compensated with the procedure in terms of its drive-away characteristic.