What is it about?
Fully flexible valve trains add a multitude of possibilities to enhance the performance of internal combustion engines - increase of power, increase of torque, reduction of pollutants, increase of efficiency and so on. Here, we discuss the possibility to increase efficiency by adequately setting lift and closing of the intake valves of a spark ignition engine.
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Why is it important?
Literature often reports that early closing of intake valves leads to a dissipation of in-cylinder turbulence and hence to a reduction of the burning velocity - which leads t a reduction of engine efficiency for spark ignited engines. We systematically analyzed this using a fully flexible valve train and found, that the burning velocity is reduced slightly but the overall effects (taking reduction of throttling losses into account) is still very beneficial.
Perspectives
Fully variable valve timing proved to increase engine performance - this technology may be a key for future engines, especially if they are operated flexibly with renewable fuels.
Dr.sc.techn. ETH Patrik Soltic
Empa
Read the Original
This page is a summary of: Effect of the Intake Valve Lift and Closing Angle on Part Load Efficiency of a Spark Ignition Engine, Energies, April 2020, MDPI AG,
DOI: 10.3390/en13071682.
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