Procedure for diagnosis of an emission treatment method and procedures to carry out same said method

US7698934B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Volker Reusing · Stuttgart, DE
• Stefan Stein · Saulheim, DE
• Ralf Scholl · Stuttgart, DE
• Guenter Keusen · Stuttgart, DE
• Carsten Bork · Tamm, DE

Key dates

• Filing date: Feb 2, 2007
• Grant date: Apr 20, 2010
• Expiry date: Jul 12, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A procedure specifically for the execution of a diagnosis of an emission treatment system is being introduced. The pressure of the reagent between the first and second valve and/or between the second valve and the injector valve is measured and the pressure measuring signal are the basis of the diagnosis. The first and second valve, are opened in an alternating cycle, where the opening time, and/or the period duration of the first and second valves are set in such a way that the emerging diagnostic flow volume is smaller than the measuring flow volume. The procedures pursuant to the invention thereby reduce the influence of dynamic precursors of the reagent flow in the reagent line and enables, aside from an increase in reliability of the diagnosis results, a diagnosis possibility of small leakages.