Daimler-benz Ag

Daimler Chrysler Ag

Stephan Kramer

Klaus Rossler

Christian Enderle

Gunter Karl

Roland Kemmler

Peter Hohner

Gregor Renner

Johannes Leweux

Rudolf Klein

Christoph Lux

Andreas Biemelt

Bernd Baur

Peter Lautenschutz

Alexander Anderson

Matthias Schumacher

Stephan Pischinger

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

Otto internal-combustion engines having one injector respectively per cylinder for the internal mixture formation can be operated at full load or high partial load by fuel injection in the suction stroke of the piston and, at medium or low partial load, with a compression stroke injection. The compression stroke injection, which is advantageous in this load range, because of low average combustion space temperatures and the tendency to form deposits in the combustion space because of residues of liquid fuel and the resulting impaired operating conditions, can partially be carried out only to a limited degree. In order to provide a process for operating an Otto internal-combustion engine of the above-mentioned type which permits an arbitrary operating period in the medium or low load range, it is provided that, in the operation of the internal-combustion engine with a compression stroke injection, as a function of the time or at least of an operating parameter, independently of the momentary load requirement, a change-over takes place to a suction stroke injection while simultaneously reducing the intake air quantity and, after the conclusion of a certain free-burning interval, a switching-back takes place into the operating mode with the compression stroke injection.

Process for operating an Otto internal-combustion engine having an

In a method of operating an internal combustion engine with direct injection of fuel into an engine combustion chamber during a compression stroke of a respective piston wherein first a main fuel volume is injected and subsequently an ignition fuel volume is injected into the combustion chamber, the injection of the main fuel volume is initiated only after about 3/10 of the compression stroke of the piston has been completed.

Method of operating an internal combustion engine

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Leutenbach, Germany

Stephan Kramer