摘要：AbstractLean combustion in Spark-ignition (SI) engines has long been recognized as an effective way to improve fuel economy and reduce pollutant emissions. However, servere cyclic variation as combustion mixture being leaned out causes cylinder-to-cylinder imbalance, which may further leads to poor engine performance. In this paper, cylinder-to-cylinder imbalance in lean combustion has been analyzed using symbol statistics. The results shows that while determinism in cyclic variation increases as diluted level increases, deterministic features in inter-cylinder imbalance weakens at lean condition.
