Procedure and device to heat a reducing agent generation system

USRE44753E1 · kind E1 · reissue

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: Mar 11, 2011
• Grant date: Feb 11, 2014
• Expiry date: Mar 11, 2031

Classification

• Technology area (CPC —): General

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…