US 2013/0276753 A1Published application

METHOD OF OPERATING AN INTERNAL COMBUSTION ENGINE WITH LOW NOx COMBUSTION

AssigneeDaimler AG

InventorsTorsten DIELER, Dirk HAASE, Ruediger HERWEG

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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.

Claims11

Dependent claims

Operating mode for an, in particular direct-injection, internal combustion engine with exhaust gas recirculation, in particular for a direct injection gasoline engine, comprising:

wherein a RZV partial operating mode is implemented in a region of the engine characteristics map having low to medium speed and/or low to medium load, said RZV partial operating mode having a lean fuel/exhaust gas/air mixture that is ignited by compression ignition and combusts by controlled auto-ignition (RZV),
wherein the region of the engine characteristics map with compression ignition is bordered at higher load by another region of the engine characteristics map in which low-NOx combustion (NAV) is performed,
wherein at an ignition point (ZZP) a homogeneous, lean fuel/exhaust gas/air mixture with combustion air ratio λ≧1 in a given combustion chamber of the internal combustion engine is spark ignited by means of an ignition device, wherein a flame front combustion (FFV) initiated by the spark ignition transitions to controlled auto-ignition (RZV).

Dependencies are inferred from the claim text.

Facts

Application: 13/858,015Filed 6 Apr 2013
Priority: DE 10 2010 047 796.67 Oct 2010
Published: 24 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02B 11/00
Engines characterised by both fuel-air mixture compression and air compression, or characterised
F02D 41/3041
A mode being the premixed charge compression-ignition mode: with means for triggering compression ignition, e.g. spark plug
F02D 41/3064
According to or using specific or several modes of combustion: with special control during transition between modes
F02D 41/0057
According to engine operating conditions: specific combustion modes