Method for detecting the minimum opening time of a reducing agent feed device in an exhaust gas aftertreatment system comprising an SCR catalyst

US8555618B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Peter Bauer · Siegburg, DE
• Rainer Bentz · Sankt Wendel, DE
• Joris Fokkelman · Tegernheim, DE
• Joachim H. Frank · Lörrach, DE
• Hermann Ketterl · Stephansposching, DE
• Ingo Koops · Regensburg, DE
• Robert Leinfelder · Birkenfeld, DE

Key dates

• Filing date: Sep 18, 2008
• Grant date: Oct 15, 2013
• Expiry date: Feb 25, 2029

Classification

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

Abstract

In a method for adapting the reducing agent feed in an exhaust gas aftertreatment system having an SCR catalyst for removing nitrogen oxides from the exhaust gas of an internal combustion engine and at least one reducing agent feed device, the minimum opening time of the reducing agent feed device is determined during operation and while suspending nitrogen emission, carrying out the following steps: a) the opening time of the reducing agent feed device is gradually prolonged until b) a reducing agent-sensitive sensor in the exhaust gas aftertreatment system detects a reducing agent signal. An exhaust gas aftertreatment system is designed accordingly for carrying out the method and a device is designed for controlling an exhaust gas aftertreatment system.