Daimler Ag

Andreas Spieth

Christoph Lux

Michael Oechsle

Bernd Köhler

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 (&#x3bb;&#x3e;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 (&#x3bb;&#x3c;1), which is then ignited by the spark plug.

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Dettingen, Germany

Andreas Spieth