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Title:
OPERATIONAL METHOD FOR AN INTERNAL COMBUSTION ENGINE HAVING LOW NOX COMBUSTION (NAV)
Document Type and Number:
WIPO Patent Application WO/2012/045460
Kind Code:
A3
Abstract:
The invention relates to an operational method for, in particular, a direct injection internal combustion engine having a plurality of combustion chambers, in particular for a direct- injection spark-ignition engine, for example, a motor vehicle with at least partial low NOx- combustion (NAV) and several operational sub-methods. Said method alternates between a charge compression combustion sub-method with pure charge compression combustion (RZV) and a low NOx operation sub-method. In the event of the low NOx- combustion sub-method being ignited at an ignition time point (ZZP), a predominately homogeneous, lean fuel/exhaust gas/air mixture having a combustion air ratio λ≥ is spark ignited in the respective combustion chamber by means of an ignition device and a flame front combustion (FFV) that has been ignited by the spark ignition, are converted into a charge compression combustion (RZV). By combining the low NOx- sub-method with the charge compression combustion sub-method, the engine load range, in which charge compression combustion (RZV) can be carried out, is increased, and consequently, the fuel consumption and the NOx-emission values are also reduced in said widened engine load range.

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Inventors:
DIELER TORSTEN (DE)
HAASE DIRK (DE)
HERWEG RUEDIGER (DE)
Application Number:
PCT/EP2011/005000
Publication Date:
August 23, 2012
Filing Date:
October 07, 2011
Export Citation:
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Assignee:
DAIMLER AG (DE)
DIELER TORSTEN (DE)
HAASE DIRK (DE)
HERWEG RUEDIGER (DE)
International Classes:
F02D41/30; F02D1/12
Foreign References:
EP2058499A22009-05-13
DE102006044523A12007-03-22
AT5720U12002-10-25
DE102006041467A12007-03-15
Other References:
JARI HYVÖNEN ET AL: ""Operating Conditions Using Spark Assisted HCCI Combustion During Combustion Mode Transfer to SI in a Multi-Cylinder VCR-HCCI Engine", 2005 SAE WORLD CONGRESS, vol. 2005-01-0109, 11 April 2005 (2005-04-11), XP055027560
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