Method for operating an internal combustion engine

US8763366B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Bernd Christner · Altensteig, DE
• Alexander Kaiser · Neutraubling, DE
• Berthold Keppeler · Owen, DE
• Holger Kissling · Bonndorf, DE
• Markus Paule · Bad Marienberg, DE

Key dates

• Filing date: Mar 14, 2013
• Grant date: Jul 1, 2014
• Expiry date: Mar 14, 2033

Classification

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

Abstract

In a method for operating an air-compressing fuel-injection internal combustion engine having an exhaust gas post-treatment system with a particle filter and a nitrogen oxide reduction catalytic converter, a plurality of internal combustion engine operating settings are provided, each having respective predefined values for predefined internal combustion engine operating parameters. A heating operating setting is set when the internal combustion engine is warming up, while a basic operating setting is set in the warmed-up state. When the temperature in the exhaust gas system exceeds a predefinable first value, the heating operating setting is changed over to the basic operating setting. In the warmed-up state, at least one further (third) operating setting, with an exhaust gas recirculation rate that is reduced compared to the basic operating setting, is provided in addition to the basic operating setting.