The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2008
Filed:
Oct. 13, 2006
Bernd Köhler, Donzdorf, DE;
Christoph Lux, Stuttgart, DE;
Michael Oechsle, Sindelfingen, DE;
Andreas Spieth, Dettingen, DE;
Bernd Köhler, Donzdorf, DE;
Christoph Lux, Stuttgart, DE;
Michael Oechsle, Sindelfingen, DE;
Andreas Spieth, Dettingen, DE;
Daimler AG, Stuttgart, DE;
Abstract
In a method for operating a spark-ignition internal combustion engine with direct fuel injection in the post-start phase at low temperatures, fuel is supplied to the combustion air in a pilot injection (M) of a first fuel quantity during an intake stroke of the internal combustion engine such that the pilot injection (M) forms a homogeneous, lean air/fuel mixture (λ>1) in substantially the entire combustion chamber, and a main injection (M) of a second fuel quantity is subsequently injected into the combustion chamber during a compression stroke directly before the ignition time (ZT), said main injection (M) forming in the region of the spark plug a stratified, rich air/fuel mixture (λ<1), which is then ignited by the spark plug.