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MTZ worldwide

, Volume 73, Issue 5, pp 28–32 | Cite as

Variable Compression Ratio for Gasoline Engines

  • Rolf Weinowski
  • Karsten Wittek
  • Carsten Dieterich
  • Jörg Seibel
Development Compression
  • 133 Downloads

Downsizing in combination with turbocharging enables a sustainable CO2 emission reduction. In order to mitigate knock at higher engine loads the compression ratio has to be diminished with increasing boost pressure levels. To alleviate disadvantages of reduced efficiency at part load FEV developed a two-stage variable compression ratio mechanism.

MOTIVATION

In order to meet the CO2 fleet threshold value of 130 g/km in the vehicle inertia class of 1372 kg introduced by the European Commission, manufacturers already started offering boosted engines with reduced displacement. Lower throttle and friction losses of these smaller turbocharged engines enable a CO2 reduction between 10 and 20 % — depending on vehicle mass and downsizing level.

The application of downsizing in context with boosting presents a disadvantage because of the higher knock sensitivity at higher engine loads, thus the compression ratio (CR) has to be reduced. Despite the fact that the majority of the turbocharged...

References

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    Pischinger, S.; Wittek, K.; Tiemann, C.: Zweistufiges variables Verdichtungsverhältnis durch exzentrische Kolbenbolzenlagerung. In: MTZ 70 (2009), No. 2, pp. 128–136Google Scholar
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    Wittek, K.; Tiemann, C.; Pischinger, S.: Two-stage variable compression ratio with eccentric piston pin and exploitation of cranktrain forces. SAE 09PFL-0468Google Scholar
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    Schwaderlapp, M.; Pischinger, S.; Yapici, K.I.; Habermann, K.; Bollig, C.; Variable Verdichtung — eine konstruktive Lösung für Downsizing-Konzepte. 10. Aachener Kolloquium Fahrzeug- und Motorentechnik, 2001Google Scholar
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    Schwaderlapp, M.; Adomeit, P.; Kolbeck, A.; Thewes, M.: Ethanol und sein Potenzial für Downsizing-Motorenkonzepte. In: MTZ 73 (2012), No. 2, pp. 120–125Google Scholar

Copyright information

© Springer Fachmedien Wiesbaden 2012

Authors and Affiliations

  • Rolf Weinowski
    • 1
  • Karsten Wittek
    • 1
  • Carsten Dieterich
    • 1
  • Jörg Seibel
    • 1
  1. 1.FEV GmbHAachenGermany

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