Method of operating an internal combustion engine with low NOx combustion

US9382834B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Torsten Dieler · Stuttgart, DE
• Dirk Haase · Leutenbach, DE
• Ruediger Herweg · Eßlingen, DE

Key dates

• Filing date: Apr 6, 2013
• Grant date: Jul 5, 2016
• Expiry date: Apr 15, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An operating mode for an internal combustion engine, in particular a directly injected internal combustion engine having a plurality of combustion chambers, in particular for a directly injected gasoline engine, e.g. for a motor vehicle, having low NOx combustion (NAV). During the NAV operating mode that is the subject matter of this invention, at an ignition point (ZZP) a largely homogeneous, lean fuel/exhaust gas/air mixture having a combustion air ratio of λ≧1 in the respective combustion chamber is spark ignited by an ignition device, whereby the flame front combustion initiated by the ignition device (FFV) transitions to a controlled auto-ignition (RZV). The NAV operating mode enables a controlled auto-ignition to be performed in an engine load range in which a pure RZV operating mode is no longer stable enough to be implemented.