Procedure and device to heat a reducing agent generation system

US7559195B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Riegger · Stuttgart, DE
• Franz-Josef Trompeter · Aachen, DE
• Ralf Wegst · Gaggenau, DE
• Thorsten Raatz · Schwieberdingen, DE

Key dates

• Filing date: Nov 14, 2006
• Grant date: Jul 14, 2009
• Expiry date: Feb 21, 2027

Classification

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

Abstract

The invention concerns a procedure to heat a reducing agent generation system of an exhaust gas aftertreatment system of an internal combustion engine by combustion of fuel, whereby the reducing agent is produced for the selective catalytic reduction of nitrogen oxides in the exhaust gas of the internal combustion engine in the intermittently operated reducing agent generation system, whereby the reducing agent generation system consists of a plasma burner, a mixing chamber located downstream or upstream from the plasma chamber, an oxidation reformation unit as well as a nitrogen oxide storage/ammonia production unit and whereby nitrogen oxide is produced in a plasma in the plasma burner. The invention concerns additionally a corresponding device.The task of the invention concerning the procedure is thereby solved, in that the combustion of the fuel is ignited by the plasma. For this reason, the heating of the catalytic components required at the start of the reducing agent generation system results through the combustion of fuel by means of a burner functionality, which consists of a fuel metering mechanism and the existing plasma burner. A special heating burner as an auxiliary m…