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:
Apr. 19, 2011
Filed:
Dec. 11, 2008
Peter Huebner, Stuttgart, DE;
Peter Huebner, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
Suggested are a procedure for diagnosing a metering valve () of an exhaust gas treatment device (), which doses a reagent () into the exhaust gas area () of a combustion process, whereby the reagent () is brought to a metering pressure (p_Ds) by a pump () and which is dosed by the metering valve (), at which the diagnosis is undertaken by evaluating a pressure drop () of the reagent (), and a device for implementing the procedure. At first the pump () is switched off. Subsequently the metering is continued during a diagnosis metering operation. The reagent quantity (m) that has been dosed is determined during the diagnosis metering operation. Not until reaching a dosing quantity threshold (m_Lim) the evaluation of the pressure drop () is terminated.