Method for operating a diesel engine

US7293407B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Holger Adler · Stuttgart, DE
• Klaus Allmendinger · San Juan Capistrano, US
• Dirk Becker · Bad Hersfeld, DE
• Oliver Erlenmayer · Pforzheim, DE
• Andreas Hasert · Winnenden, DE
• Hans-Hubert Hemberger · Notzingen, DE
• Anton Kerckhoff · Stuttgart, DE
• Stefan Kurze · Brunsbüttel, DE
• Michael Lenz · Zorneding, DE
• Thomas Liebscher · Fellbach, DE
• Ulrich Merten · Pittsburgh, US
• Andreas Roll · Eßlingen, DE
• Norbert Ruzicka · Steinenbronn, DE

Key dates

• Filing date: Jun 15, 2001
• Grant date: Nov 13, 2007
• Expiry date: Jun 15, 2021

Classification

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

Abstract

The invention relates to a method for operating a diesel engine in which an air ratio (λ) of the fuel which is to be burnt and of the combustion air supplied is set by a control unit (14) according to predetermined values. When a value (15) which is predetermined as a switching criterion is recorded, the control unit (14) switches to a special operating mode for regeneration of a catalytic converter (22) and sets the fuel/air ratio according to predetermined values for this operating mode.To achieve more effective regeneration of the catalytic converter, according to the invention it is provided that at least one afterinjection, which is separated in time from a main injection, of fuel which is also to be burnt takes place in the special operating mode.