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Combustion Variation Control of SI Engines via Hypothesis Testing and EGR Step Valve

机译:通过假设检测和EGR步骤阀的Si发动机燃烧变化控制

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In gasoline engines, the variation of the combustion is often evaluated by the coefficient of variance (CoV) of the indicated mean effective pressure (IMEP). Due to the involvement of the mean and the standard deviation in the calculation, a large number of engine cycles are necessary for an accurate estimation of the CoV. However, in the case of realtime engine control, the number of available data is often limited. Thus, statistic-based methods have to be applied to determine whether the CoV is greater or less than a given threshold. In this work, a hypothesis testing based on McKay’s approximation is proposed to statistically evaluate the CoV of IMEP. The results of the proposed testing method are then used to control the EGR valve step to maintain the IMEP CoV at a given threshold. The proposed method was validated on a testbench with a production gasoline engine.
机译:在汽油发动机中,燃烧的变化通常通过所示平均有效压力(IMEP)的方差系数(COV)进行评估。 由于平均值和标准偏差在计算中的累积,大量发动机周期对于COV准确估计是必要的。 然而,在实时引擎控制的情况下,可用数据的数量通常是有限的。 因此,必须应用基于统计的方法以确定COV是否大于或小于给定阈值。 在这项工作中,提出了一种基于Mckay近似的假设测试,以统计评估IMEP的COV。 然后使用所提出的测试方法的结果来控制EGR阀步骤以将IMEP COV保持在给定阈值。 用生产汽油发动机在试验台上验证了所提出的方法。

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