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. 15, 2011
Filed:
Feb. 07, 2006
Ruben-sebastian Henning, Stuttgart, DE;
Ulrich Pechtold, Schwieberdingen, DE;
Horst Fuhrmann, Grossbottwar, DE;
Guenter Schelkle, Baltmannsweiler, DE;
Seigfried Zerbin, Hinterlintal, DE;
Ruben-Sebastian Henning, Stuttgart, DE;
Ulrich Pechtold, Schwieberdingen, DE;
Horst Fuhrmann, Grossbottwar, DE;
Guenter Schelkle, Baltmannsweiler, DE;
Seigfried Zerbin, Hinterlintal, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for operating an internal combustion engine, in whose exhaust gas system an exhaust gas treatment device is positioned, a reagent, which is possibly mixed with compressed air, being introduced into the exhaust gas system upstream from the exhaust gas treatment device, and a device for performing the method. The reagent is brought to a predefined reagent setpoint pressure using a reagent pump and subsequently metered using a reagent dosing valve. The reagent pressure existing upstream from the reagent dosing valve is detected. In the framework of a diagnosis, a time curve of the reagent setpoint pressure is predefined. The reagent pressure detected during the diagnosis is compared to at least one predefined threshold value. If the threshold value is exceeded, an error signal is provided. The corresponding diagnosis of a compressed air path may be provided alternatively or additionally to the diagnosis of the reagent path.