Method for operating a multiple injection internal combustion engine in the starting phase

US6899077B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jens Wagner · Untergruppenbach, DE
• Karsten Kroepke · Ludwigsburg, DE
• Andreas Kufferath · Besigheim, DE

Key dates

• Filing date: Dec 5, 2002
• Grant date: May 31, 2005
• Expiry date: Dec 5, 2022

Classification

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

Abstract

The aim of the invention is to reduce exhaust emission during the staring phase of a direct-injection internal combustion engine. For this purpose, at least one first injection per working cycle takes place when the internal combustion engine is cold, especially during the starting and/or warm-up phase, thereby producing a substantially homogeneous, combustible fuel/air mixture (56) in the combustion chamber (12). In the same working cycle at least one further injection is supposed to take place which produces a substantially rich fuel/air mixture (64) in the zone of the ignition device (34). The lambda value of the fuel/air mixture (64) produced by the second injection in the zone of the ignition device (34) is smaller than the lambda value of the fuel/air mixture (56) present in the remaining combustion chamber.