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首页> 外文会议>2001 Fall Technical Conference of the Asme Internal Combustion Engine Division, 2001, Sep 23-26, 2001, Argonne, Illinois >ENGINE VARIABLES AFFECTING THE SI ENGINE KNOCK
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ENGINE VARIABLES AFFECTING THE SI ENGINE KNOCK

机译：影响SI引擎节点的引擎变量

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To program the automatic performance control loops of the modern cars at the design stage, numerical result of engine variables effecting knock intensity is the most important tool. Although general aspects of the effect of engine operating conditions on knock have been studied in previous investigations, precise numerical results of that, are not available. The procedures proposed in the past to provide the requirements of the models either predicting or measuring knock are complicated and the details are not presented. In the current work, on the basis of the 'sampling frequency theorem' and in regard to the measured frequency of the knocking-pressure fluctuations, a fast on-line data acquisition system was designed and developed. The system was used on a variable compression ratio research engine using two different fuels. Large number of the engine pressure crank angle data were recorded at different operating conditions. Knock intensity measurement was carried out using a developed criteria obtained by a careful analysis of pressure oscillations at 0.25 degree crank angle intervals. This lead to identification of cycles having specified knock intensity over a wide range of operating conditions. Effect of engine variables on knock intensity was therefore measured numerically for both fuels. Using the simple criteria to study the effect of engine operating conditions on the intensity of knock produced the results which agreed with the earlier experimental findings.
机译：为了在设计阶段对现代汽车的自动性能控制回路进行编程，影响爆震强度的发动机变量的数值结果是最重要的工具。尽管在先前的研究中已经研究了发动机工况对爆震的一般影响，但尚无确切的数值结果。过去提出的用于提供模型要求的模型（预测或测量爆震）的过程很复杂，并且未提供细节。在当前的工作中，基于“采样频率定理”，并针对测得的爆震压力波动频率，设计并开发了一种快速的在线数据采集系统。该系统用于使用两种不同燃料的可变压缩比研究发动机。在不同的工况下记录了大量的发动机压力曲轴转角数据。使用发达的标准进行爆震强度测量，该标准是通过仔细分析0.25度曲柄角间隔处的压力振荡获得的。这导致在宽范围的工作条件下识别具有指定爆震强度的循环。因此，对于两种燃料，均通过数值测量了发动机变量对爆震强度的影响。使用简单的标准研究发动机工况对爆震强度的影响，得出的结果与早期的实验结果相符。

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