A Cycle-to-Cycle Method to Predict HCCI Combustion Phasing
A Cycle-to-Cycle Method to Predict HCCI Combustion Phasing
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预测 HCCI 燃烧定相的逐周期方法
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Bohac
中科院分区：
文献类型：
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作者：
A. Vaughan;S. Bohac
均质充量压缩点火（HCCI）是一种低温燃烧策略，其同时提高燃料效率并降低发动机排出的NOx排放。不幸的是，HCCI的广泛使用受到燃烧不稳定性和有限的操作范围的阻碍。为了帮助理解这些局限性，本文将生产四缸发动机中的各个气缸视为动态系统，当发动机在未增压、负气门重叠HCCI燃烧模式下运行时，该动态系统循环地保持CA90（实现90%净放热的曲柄角）。事实证明，这种方法可以提供对稳定极限分叉行为的定性了解，同时还可以在各种瞬态和稳态条件下对燃烧定相进行定量循环预测，直到完全失火。版权所有© 2013 by ASME
Homogeneous Charge Compression Ignition (HCCI) is a low temperature combustion strategy that simultaneously improves fuel efficiency and lowers engine-out NOx emissions. Unfortunately, broad usage of HCCI is hampered by combustion instabilities and a limited operation envelope. To help understand these limitations, this paper treats individual cylinders in a production four-cylinder engine as dynamical systems that iterate CA90 (the crank angle where 90% of net heat release is achieved) cycle-to-cycle as the engine operates in an unboosted, negative valve overlap HCCI combustion mode. This approach is shown to provide qualitative understanding of the stability limit bifurcation behavior, while also enabling quantitative cycle-to-cycle predictions of combustion phasing across a wide variety of transient and steady-state conditions, right up to complete misfire.Copyright © 2013 by ASME