Method for operating an internal combustion engine and a device for carrying out the method

US7603846B2 · kind B2 · utility

Assignee

• Ronert Bosch GmbH · DE

Inventors

• Hartmut Lueders · Oberstenfeld, DE
• Christian Walz · Durmersheim, DE
• Thorsten Mayer · Worms, DE
• Matthias Loehr · Steinheim, DE

Key dates

• Filing date: Sep 26, 2005
• Grant date: Oct 20, 2009
• Expiry date: Jun 26, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for operating an internal combustion engine whose exhaust area has at least one SCR catalytic converter and a device for carrying out the method are described. The SCR catalytic converter receiving the reagent supports the conversion of the raw NOx emission of the internal combustion engine. At least a measure of the NOx concentration occurring downstream from the SCR catalytic converter is calculated and this value may be used to define a metering signal for the reagent and/or a heating measure for heating the SCR catalytic converter may be initiated. According to a refinement of this arrangement, a difference between the calculated NOx concentration and the sum of the measured NOx concentration and the measured reagent concentration downstream from the SCR catalytic converter is determined, and it is possible to intervene in the determination of the metering signal depending on the difference.