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, Volume 78, Issue 10, pp 36–41 | Cite as

Variable Turbine Geometry Additional Degree of Freedom for CO2 Reduction

  • Björn FranzkeEmail author
  • Adrian Schloßhauer
  • Dominik Lückmann
  • Matthias Thewes
Development
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In the light of a global trend for the tightening of the CO2 limits, the combination of the Miller process and exhaust gas turbocharging with variable turbine geometry represents a promising concept for efficiency improvements of modern gasoline engines. Using the example of a three- cylinder 1.5-l downsizing concept with 90 kW/l, FEV illustrates the differences between a variant with variable turbine geometry and a wastegate turbine with regards to achievable Miller ratio, fuel consumption and transient behaviour in this publication.

Eq. 1 Miller ratio =
$$\frac{{\mathrm{v}}_{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{p}\mathrm{l}\mathrm{a}\mathrm{c}\mathrm{e}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t},exp\mathrm{a}\mathrm{n}\mathrm{s}\mathrm{i}\mathrm{o}\mathrm{n}}^{}}{{\mathrm{v}}_{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{p}\mathrm{l}\mathrm{a}\mathrm{c}\mathrm{e}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t},\mathrm{I}\mathrm{V}\mathrm{C}}^{}}$$

Copyright information

© Springer Fachmedien Wiesbaden GmbH 2017

Authors and Affiliations

  • Björn Franzke
    • 1
    Email author
  • Adrian Schloßhauer
    • 2
  • Dominik Lückmann
    • 3
  • Matthias Thewes
    • 4
  1. 1.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  2. 2.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  3. 3.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  4. 4.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany

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