Daimler Chrysler Ag

Daimler Ag

Siemens Aktiengesellschaft

Christoph Lux

Michael Oechsle

Gregor Renner

Gunter Karl

Johannes Leweux

Bernd Baur

Rudolf Klein

Stephan Kramer

Klaus Rossler

Peter Lautenschutz

Bernd Köhler

Alexander Anderson

Matthias Werner

Andreas Spieth

Matthias Schumacher

Wolf-Eike Holtschmit

Christoph Eisath

Hans Dieter Heidenfelder

Stefan-Max Weber

In a method for operating a spark-ignition, direct-injection internal combustion engine, wherein fuel is injected into a cylinder of the internal combustion engine and is ignited by a spark plug as a function of at least the load of the internal combustion engine, a crank angle is determined at which a first amount of fuel is injected into the cylinder during the intake stroke whereby a lean mixture is formed in the cylinder, subsequently, as a function of at least the load of the internal combustion engine, a crank angle is determined at which a second amount of fuel is injected, whereby a mixture cloud, which is richer than the lean mixture is formed in the lean mixture and a third amount of fuel is injected in the form of a stratified injection for forming a locally enriched and ignitable fuel/air mixture in the region of the spark plug close to an ignition time which is then ignited by the spark plug causing also combustion of the mixture cloud and the lean mixture.

Method of operating a spark ignition internal combustion engine

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.

Method for operating an internal combustion engine with direct fuel injection during a post-start phase

Method for increasing the safety of motor-vehicle occupants in the event of a crash

A changeover is made between a so-called low-pressure starting with a homogeneous mixture and a so-called high-pressure starting with a stratified mixture as a function of an engine coolant temperature. Since, during the high-pressure starting of the internal combustion engine, injection is released only when a pressure in a high-pressure accumulator exceeds a predetermined threshold value, the injected fuel is better prepared. During such high-pressure starting, injection is predetermined by an injection quantity and an angle of an end of injection. Predetermining the angle of the end of injection, in contrast to predetermining an angle of commencement of injection during conventional low-pressure starting, ensures that there is an ignitable mixture present at the sparkplug, specifically irrespective of a duration of injection.

Method for operating a direct-injection internal combustion engine

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Stuttgart, Germany

Christoph Lux