Model Based E85 Cold Start Optimization for DISI Engines

The startability of SI engines, especially of DISI engines, is the greatest challenge when using ethanol blended fuels. The development of a suitable injection strategy is therefore the main engineering target when developing an ethanol engine with direct injection. In order to limit the test effort...

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Bibliographic Details
Published in:SAE International Journal of Fuels and Lubricants 2009-01, Vol.2 (1), p.902-910, Article 2009-01-1909
Main Authors: Liebsch, S, Dingel, O, Maass, J, Günther, M, Kratzsch, M, Zwahr, S
Format: Article
Language:English
Subjects:
Cold starts
Cylinder heads
Cylinder liners
Cylinders
Engines
Ethanol
Ethanol fuels
Evaporation
Fuels
Injection
Low temperature
Modeling
Optimization
Simulations
Spark ignition
Surface tension
Temperature ratio
Vaporization
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Summary:The startability of SI engines, especially of DISI engines, is the greatest challenge when using ethanol blended fuels. The development of a suitable injection strategy is therefore the main engineering target when developing an ethanol engine with direct injection. In order to limit the test efforts of such a program, a vaporization model has been created that provides the quantity of vaporized fuel depending on pressure and on start and end, respectively number and split relation of injections. This model takes account of the most relevant fuel properties such as density, surface tension and viscosity. It also considers the interaction of the spray with cylinder liner, cylinder head and piston. A comparison with test results shows the current status and the need for action of this simulation model.
ISSN:1946-3952
1946-3960
1946-3960
DOI:10.4271/2009-01-1909