Method for operating an internal combustion engine and device for implementing the method

US7665295B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Andreas Pfaeffle · Löwenstein, DE
• Johannes Schaller · Lambach, DE
• Wolfram Veigel · Hessigheim, DE
• Cord Scharsack · Schenefeld, DE
• Rudi Drefs · Friolzheim, DE
• Viktor Pauli · Stuttgart, DE
• Thomas Walter · Renningen, DE

Key dates

• Filing date: Jan 10, 2006
• Grant date: Feb 23, 2010
• Expiry date: Mar 29, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method is provided for operating an internal combustion engine in whose exhaust-gas region an exhaust-gas treatment device is situated, and in which a reagent is introduced into the exhaust-gas region of the internal combustion engine. in addition, a device is provided for implementing the method. The reagent pressure occurring between a reagent safety valve and a reagent dosing valve, disposed directly in the exhaust-gas region is recorded during different states of the reagent safety valve and/or the reagent dosing valve and compared to at least one threshold value. If the threshold is exceeded, a fault signal is provided. This may offer high safety which may be of particular importance when fuel is used as reagent.