What is it about?
Swirl flaps are commonly used on diesel engines to reduce soot at light load, but with a penalty in fuel consumption. This paper examines asymmetric inlet valve opening as an alternative to swirl flaps to avoid this fuel consumption penalty at a variety of diesel engine operating conditions.
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Why is it important?
Diesel engine-out emissions reduction is vital as we move towards lower CO2 vehicles. This technology offers potential NOx/Soot reductions while retaining the benefit of lower CO2.
Perspectives
This was a good study neatly comparing the two technologies, and highlighted a "sweet spot" for this offset cam technology
Dr Felix CP Leach
University of Oxford
Read the Original
This page is a summary of: Comparing the Effect of a Swirl Flap and Asymmetric Inlet Valve Opening on a Light Duty Diesel Engine, October 2017, SAE International,
DOI: 10.4271/2017-01-2429.
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