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, Volume 21, Supplement 1, pp 40–45 | Cite as

Potential of variable intake manifolds to reduce CO2 under partial load

  • Heinz Bühl
  • Matthias Kratzsch
  • Michael Günther
  • Herbert Pietrowski
75 years of MANN+HUMMEL Technology

Since the introduction of turbocharging, the use of variable intake manifolds to boost performance has declined. In addition to influencing the full load characteristic curve, active intake manifolds however offer advantages in partial load operation. MANN+HUMMEL and IAV have studied the fuel consumption potential of variable intake manifolds on two current gasoline engine concepts in the NEDC.

Optimization throughout the entire engine map

Against the background of climate change, the EU Commission plans to limit the maximum CO2 emissions of the fleet average to 95 g CO2/km by 2020. The CO2 reduction can take place in the combustion engine as well as through hybridization or by using an electric drive. If these targets are not achieved, the EU Commission intends to introduce a fine as of 2019 of Euro 95 per gram of excess CO2 for every vehicle sold. The associated, considerable cost burden for the manufacturer is increasing pressure on them to reduce CO2 emissions.

Variable intake...


Full Load Partial Load Intake Manifold Valve Timing Real Driving Emission 
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Copyright information

© Springer Fachmedien Wiesbaden 2016

Authors and Affiliations

  • Heinz Bühl
    • 1
  • Matthias Kratzsch
    • 2
  • Michael Günther
    • 3
  • Herbert Pietrowski
    • 1
  1. 1.IAV GmbHLudwigsburgGermany
  2. 2.IAV GmbHBerlinGermany
  3. 3.IAV GmbHChemnitzGermany

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