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. 05, 2013
Filed:
Jun. 07, 2011
Arthur Bastoreala, Remseck Am Neckar, DE;
Alexander Franz, Kornwestheim, DE;
Tobias Pfister, Stuttgart, DE;
Arthur Bastoreala, Remseck Am Neckar, DE;
Alexander Franz, Kornwestheim, DE;
Tobias Pfister, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method is provided for monitoring an SCR catalytic converter (), in which method the NHstorage capacity of the SCR catalytic converter () is monitored. The SCR catalytic converter () is initially filled in an overdosing phase with a superstoichiometric reducing agent dosing up to the maximum NHstorage capacity. The catalytic converter is subsequently acted on in an underdosing phase with a reducing agent dosing which is reduced in relation to a normal dosing or is absent. The NHstorage capacity is indirectly determined during the underdosing phase by determining at least one characteristic value which is dependent on the NOconversion rate. According to the invention, to detect NHslippage (), which indicates the transition from the overdosing phase to the underdosing phase, a variable which is characteristic of the NOx conversion is continuously measured during the overdosing phase, and in the event of a fall in the NOx conversion, it is inferred that NHslippage () is present.