Potential of variable intake manifolds to reduce CO2 emissions in part load

Bühl, Heinz; Kratzsch, Matthias; Günther, Michael; Pietrowski, Herbert

doi:10.1007/s38313-013-0111-7

Cited by 4 publications

(2 citation statements)

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“…Pressure wave can also be a solution in the search of fuel consumption reduction for spark-ignition engine at part load [11]. The generated pressure waves at the intake can have the effect of "de-throttling" when the intake is optimized and controlled with a variable length manifold for instance.…”

Section: Runners Lengths Influencementioning

confidence: 99%

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A model based system approach to innovative smart intake products: CO2 savings and specific performance

Migaud¹,

Bühl²,

Raimbault³

et al. 2015

Proceedings

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On modern combustion engines, air induction systems are evermore evolving into more complicated elements with an objective to find the best trade-off between fuel consumption, pollutant emissions and engine performance. This pursuit has led to the emergence of the downsized turbocharged engine. For such an engine, it's necessary to reinforce the low end torque. This is because, at low operating speeds and loads, the lack of enthalpy at the exhaust side causes a poor behavior of the turbocharger which leads to a poor boost pressure and consequently a deficit of engine performance. The proposed idea in this case would be to benefit from an optimized 'smart' air intake system to solve this issue while assuring other interesting functions as well. First, cylinder filling can be enhanced by assuring acoustic resonance conditions at the intake. The result is an increase of air flow leading to a better torque response and vehicle responsiveness. Pressure waves induced boosting can also help to reduce the thermal stress on the turbocharger as well as the size of the charge air cooler. Secondly, pressure waves can help to save energy by 'de-throttling' at part load operation on an SI engine. This has the effect of reducing the pumping loop and thus enhancing specific fuel consumption. Mechatronic integration into smart systems at the intake is necessary to achieve such goals. The Active Charge Air Duct (ACAD) and the active air intake manifold presented in this paper are innovative plastic products that aim to reduce fuel consumption. This is achieved through geometries with a high flexibility of thermoplastic processes.

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Section: Runners Lengths Influencementioning

confidence: 99%

“…Another part of this paper dedicated to 'de-throttling' strategy will help to reduce the fuel consumption of a spark-ignition engine [11] at part loads.…”

Section: Introductionmentioning

confidence: 99%