10th Symposium "The Working Process of the Internal Combustion Engine"
Investigation of the Gasoline Direct Start
Authors
Matthias Alt, GM Powertrain Europe, Rüsselsheim, Thomas Blattmann, Janko Bošnjak, Jochen Laubender, Jürgen Gerhard, Robert Bosch GmbH, Stuttgart
Year
2005
Summary
A direct injected gasoline engine can be started quickly without a conventional starter motor by injecting fuel into the closed combustion chamber and igniting it. This so-called direct start is possible in a certain temperature range and with a certain stop position range of the engine. The combustion process of the first 4 individual combustion events in the direct start is described in this paper. The effect of the cam phaser part position is discussed in detail. The engine is stopping in a brought band of geometric position. For a successful direct start the engine has to be in a close proximity of a certain geometric cranktrain position. The overall possibility to start the engine in the direct start mode is not sufficient for a customer application at this point in time. In combination with a conventional starter motor, direct start could be a successful system in the future enabling a quick comfortable start of the engine.
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