Methods and systems for treating vehicle emissions

US10323594B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Christoph Boerensen · Aachen, DE
• Dirk Roemer · Cologne, DE
• Frank Linzen · Aachen, DE
• Felix Goebel · Aachen, DE
• Brendan Patrick Carberry · Aachen, DE
• Evgeny Smirnov · Aachen, DE

Key dates

• Filing date: Jun 8, 2017
• Grant date: Jun 18, 2019
• Expiry date: Jun 8, 2037

Classification

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

Abstract

A method for controlling exhaust gas aftertreatment in an exhaust gas aftertreatment system having at least one nitrogen oxide storage catalyst and at least one catalyst for selective catalytic reduction is provided, wherein, in phases of a high load, a combustion engine is operated with a substoichiometric fuel/air mixture, and nitrogen oxides in the exhaust gas are reduced in the nitrogen oxide storage catalyst to ammonia, which is stored in the catalyst for selective catalytic reduction, and, when the storage capacity of the catalyst for selective catalytic reduction is exceeded, the combustion engine is operated with a superstoichiometric fuel/air mixture, thus allowing nitrogen oxides in the catalyst for selective catalytic reduction to be reduced by the stored ammonia.