This study investigates the cyclic dynamics of cumulative heat release data past the edge of stability in a dilute spark-ignition engine. Emphasis is placed on analyzing the cyclic dynamics near the dilute limit where partial burns and misfires are frequent. These events are often followed by a higher-energy cycle due to the feed-forward mechanism present in the residual gases. These patterns are deterministic and increase the coefficient of variation to undesirable levels. Symbol sequence analysis was used to investigate the cyclic dynamics of these low–high patterns. The heat release was partitioned on an energy basis to give physical meaning to each partition and each sequence created when analyzing the symbol sequence results. This partitioning method provided insight into the differences in the dynamics when operating in the misfire or partial burn regime. These differences could impact the control method used.

中文翻译：

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稀火花点火发动机中失火和部分燃烧的循环动力学

本研究调查了稀释火花点火发动机中超过稳定性边缘的累积放热数据的循环动力学。重点放在分析稀释极限附近的循环动力学，其中局部燃烧和失火频繁发生。由于残留气体中存在的前馈机制，这些事件通常伴随着更高的能量循环。这些模式是确定性的，并将变异系数增加到不希望的水平。符号序列分析用于研究这些低-高模式的循环动态。在分析符号序列结果时，热量释放以能量为基础进行划分，以赋予每个划分和创建的每个序列的物理意义。这种划分方法提供了在失火或部分燃烧状态下运行时动态差异的洞察力。这些差异可能会影响所使用的控制方法。