Regulating strategy for a catalytic converter concept for exhaust-gas aftertreatment having a plurality of nitrogen oxide storage catalytic converters

US9328682B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Ruediger Hoyer · Alzenau, DE
• Stefan Franoschek · Nettetal, DE
• Stephan Eckhoff · Alzenau, DE

Key dates

• Filing date: Sep 21, 2009
• Grant date: May 3, 2016
• Expiry date: Sep 14, 2032

Classification

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

Abstract

The present invention relates to a regulating strategy for a special catalytic converter for exhaust-gas aftertreatment. The catalytic converter concept is distinguished in that at least two nitrogen oxide storage catalytic converters are used in the exhaust section of a vehicle. The first, possibly close-coupled unit is followed by one or more nitrogen oxide storage catalytic converters, which are possibly situated in the underbody of the vehicle. The nitrogen oxide storage catalytic converters are then regenerated as a function of the exceedance of nitrogen oxide threshold vales downstream thereof.