Combustion stability improvement with turbulence control by air injection for a lean-burn SI engine

Authors

Takanori Suzuki, SOKEN Inc.;
Bastian Lehrheuer, Tamara Ottenwälder, Max Mally, Stefan Pischinger, Institute for Combustion Engines / RWTH Aachen University

Year

2019

Summary

Minimizing crude oil consumption is one of the major challenges for automotive industry to keep a sustainable society. Especially, transportation is one of the major sectors of energy consumption and therefore improvement of thermal efficiency is one of the important roles for automotive engine systems.
Improvement of thermal efficiency of gasoline engines is necessary as the main propulsion system of passenger cars. Lean combustion diluted with EGR (Exhaust Gas Recirculation) or intake air is one of the evolutional strategies to improve efficiency. Though, one of the issues is an increase of  combustion instability. To address this issue, the stratified combustion concept is being developed using piezoelectric-actuated injectors and corona ignition system. In this paper, an alternative concept was investigated to improve combustion stability by controlling in-cylinder air flow.

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