Exhaust gas catalytic converter system and method for operating an exhaust gas catalytic converter

US8808630B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Paul Rodatz · Landshut, DE
• Michael Nienhoff · Regensburg, DE

Key dates

• Filing date: Jan 5, 2012
• Grant date: Aug 19, 2014
• Expiry date: Jan 5, 2032

Classification

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

Abstract

A method is disclosed for operating an exhaust gas catalytic converter designed to reduce nitrogen oxides in an exhaust gas flow using a solution that contains urea and that reacts to form at least ammonia in the exhaust gas flow. The method may include: introducing an amount of the solution containing urea upstream of the exhaust gas catalytic converter until an ammonia slip through the exhaust gas catalytic converter; determining a first actual value of the loading state of the catalytic converter with ammonia at the time of the slip; determining a first estimated value of the loading state at the time of the slip by means of a dynamic model for the loading; subsequently draining the ammonia from the catalytic converter; determining a second actual value of the loading state of the exhaust gas catalytic converter with the solution containing urea when the catalytic converter is drained as specified.