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Title:
OPERATIONAL METHOD FOR AN INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2012/045462
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 engines, in particular, for a direct-injection spark ignition engine of a motor vehicle with at least partial low NOx-combustion (NAV) and several operational sub-methods. Said method alternates between at least one additional operation sub-method and a low NOx operational sub-method. In the event of the of the low NOx sub-method being ignited by means of an ignition device at an ignition time point (ZZP), a predominately homogeneous, lean fuel/exhaust gas/air mixture having a combustion air ratio of λ ≥1 is spark ignited in the respective combustion chamber and a flame front combustion (FFV) that has been ignited by the spark ignition converts into a charge compression combustion (RZV). The operational stability in the respective operational sub-method improves due to the variation of the compression ratios ε.

Inventors:
DIELER TORSTEN (DE)
HAASE DIRK (DE)
HERWEG RUEDIGER (DE)
Application Number:
PCT/EP2011/005002
Publication Date:
August 30, 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; F02B1/12; F02D15/00
Foreign References:
DE10350798A12005-05-25
US7240480B12007-07-10
EP2058499A22009-05-13
AT5720U12002-10-25
DE102006044523A12007-03-22
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
ROBERT M. WAGNER ET AL: "On the Nature of Cyclic Dispersion in Spark Assisted HCCI Combustion", SAE WORLD CONGRESS, vol. 2006-01-0418, 3 April 2006 (2006-04-03), XP055027710
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