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:
Jul. 09, 2013
Filed:
Mar. 23, 2010
Georgios Lolas, Stuttgart, DE;
Wolfgang Klenk, Loechgau, DE;
Andreas Wagner, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention provides for a method for operating an SCR catalytic converter for the aftertreatment of exhaust gases of an internal combustion engine, wherein a reducing agent tank () with reducing agent and a reducing agent metering device () are provided. The reducing agent tank () has at least one tank heater () having PTC characteristics. A variable characterizing the heater current is acquired for detecting cavities () in the reducing agent tank () when the reducing agent is frozen. The presence of cavities is suggested from a deviation of the acquired value or values for the variable characterizing the heater current from a predeterminable reference value, which represents a reducing agent tank without cavities.