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首页> 外文会议>ASME Internal Combustion Engine Division fall technical conference 2010 >COMPARISON OF CRANKANGLE BASED IGNITION TIMING METHODS ON AN HCCI ENGINE
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COMPARISON OF CRANKANGLE BASED IGNITION TIMING METHODS ON AN HCCI ENGINE

机译：HCCI发动机中基于Cangkangle的点火时序方法的比较

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摘要

Autoignition timing of a mixture in Homogeneous Charge Compression Ignition (HCCI) is very dependant and sensitive to the engine operating condition. To characterize combustion timing, different crank angle dependant methods are used but these methods can exhibit inaccurate results at some operating conditions. In this paper, a criterion that divides the engine operating condition into two regions, low and high cyclic variations (unstable operation) is defined. Then, different crankangle based methods for determining the start of combustion inside the cylinder for each of the two regions are compared. The start and duration of combustion are compared for wide range of operating conditions and the relative merits of each method discussed. The methods for characterizing the start of combustion are: CA50 based on the total heat release; the start of combustion from the third derivative of the pressure trace with respect to crank angle; the start of combustion from the third derivative of the pressure trace with respect to crank angle with two limits; CAW based on total heat release; CAW based on peak of main stage of combustion. The last method is introduced in this paper and has advantages in terms of accuracy of ignition timing detection and correlation with the start of combustion particularly for high cyclic variation engine operation. A new criterion, defined as the ratio between peak of main stage and the sum of peak of main stageand cool flame stage of heat release, is introduced to more accurately identify the operating region of the engine. This criterion is used to understand the performance of each of those crank angle based methods. The performance of each of those methods is investigated for both the low cyclic variation and the high cyclic variation (unstable) region of the engine.
机译：均质充气压缩点火（HCCI）中混合物的自燃正时非常依赖于发动机，并且对发动机工况敏感。为了表征燃烧正时，使用了不同的曲柄角相关方法，但是这些方法在某些工况下可能显示出不准确的结果。在本文中，定义了将发动机工况分为低周期性变化和高周期性变化（不稳定运行）两个区域的标准。然后，比较了用于确定两个区域中的每个区域的气缸内燃烧开始的基于曲轴的不同方法。比较了燃烧的开始时间和持续时间，以了解各种工况以及所讨论每种方法的相对优点。表征燃烧开始的方法有：CA50，基于总热量释放；从相对于曲柄角的压力曲线的三阶导数开始燃烧；从相对于曲柄角的压力迹线的三阶导数开始燃烧，有两个极限；基于总热量释放的CAW；基于燃烧主要阶段峰值的CAW。本文介绍了最后一种方法，该方法在点火正时检测的准确性以及与燃烧开始的相关性方面具有优势，特别是对于高循环变化的发动机运行而言。为了更准确地识别发动机的工作区域，引入了一个新的标准，即主阶段的峰值与主阶段的峰值与放热的冷焰阶段的总和之比。此标准用于了解每种基于曲柄角的方法的性能。针对发动机的低循环变化和高循环变化（不稳定）区域，研究了每种方法的性能。

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