An Investigation into the Operating Mode Transitions of a Homogeneous Charge Compression Ignition Engine Using EGR Trapping
An Investigation into the Operating Mode Transitions of a Homogeneous Charge Compression Ignition Engine Using EGR Trapping
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DOI：
10.4271/2004-01-1911
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发表时间：
2004-06
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通讯作者：
Hongming Xu;Simon Rudolph;Z. Liu;S. Wallace;S. Richardson;M. Wyszyński;A. Megaritis
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文献类型：
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作者：
Hongming Xu;Simon Rudolph;Z. Liu;S. Wallace;S. Richardson;M. Wyszyński;A. Megaritis
虽然均质充量压缩点火（HCCI）是一种有前途的燃烧模式，在改善车辆发动机的燃料经济性和减少排放方面具有显著优势，但它受到许多限制，例如，硬件和控制复杂性，或者在其操作上负荷边界附近NOx和NVH恶化，从而削弱了其优势。传统的火花点火燃烧模式需要更高的负荷和速度，因此，HCCI边界附近的操作条件和它们在S1模式中的相应的替代方案必须仔细研究，以便确定实用的策略，以最小化燃烧模式转换对发动机性能的影响。本文提出了一种燃烧模式之间的转换S1和HCCI的调查结果，使用发动机循环模拟代码与化学动力学的HCCI燃烧代码的组合。对燃烧模式转换及其控制的关键问题进行了研究和探讨。在HCCI发动机气体交换和燃烧的建模中采用了一种新的方法，该方法允许在逐循环的基础上对过渡过程中的瞬态过程进行参数研究，并为发动机硬件及其控制策略的设计提供指导。
While Homogeneous Charge Compression Ignition (HCCI) is a promising combustion mode with significant advantages in fuel economy improvement and emission reductions for vehicle engines, it is subject to a number of limitations, for example, hardware and control complexity, or NOx and NVH deterioration near its operating upper load boundary, diminishing its advantages. Conventional spark-ignition combustion mode is required for higher loads and speeds, thus the operating conditions near the HCCI boundaries and their corresponding alternatives in Sl mode must be studied carefully in order to identify practical strategies to minimise the impact of the combustion mode transition on the performance of the engine. This paper presents the results of an investigation of the combustion mode transitions between Sl and HCCI, using a combination of an engine cycle simulation code with a chemical kinetics based HCCI combustion code. It investigates and discusses the key issues concerning the combustion mode transition and its control. A new approach has been adopted in the modelling of the HCCI engine gas exchange and combustion, which allowed a parametric study of the transient process in the transition on a cycle-by-cycle basis and provided guidelines in the design of the engine hardware and its control strategies.