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What is Negative Valve Overlap in Gasoline Engines about?

This document summarizes a study on the potential of negative valve overlap (NVO) for improving part load efficiency in gasoline engines. The study investigated three fixed fuel flow rates at indicated mean effective pressures up to 6 bar using NVO. At low load, NVO significantly reduces pumping losses during the gas exchange loop, achieving up to 7% higher indicated efficiency compared to the baseline. Similar gains are achieved with positive valve overlap, but with worse combustion stability due to higher

Author

jlee_296737

Language

EN