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MODEL-BASED METHODOLOGY FOR ESTIMATING ENGINE CYLINDER PRESSURE IMBALANCE FOR COMBUSTION FEEDBACK CONTROL APPLICATIONS

机译:基于模型的燃烧反馈控制应用估算发动机气缸压力不平衡的方法

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One of the principal issues of alternative combustion modes for Diesel engines (such as HCCI, PCCI and LTC) is related to imbalances in the distribution of air and EGR across the cylinders, which ultimately cause significant differences in the pressure trace and indicated torque for each cylinder. In principle, a cylinder-by-cylinder control approach could compensate for air, residuals, and temperature imbalance. However, in order to fully benefit from closed-loop combustion control, it is necessary to obtain feedback from each engine cylinder to reconstruct the pressure trace. Therefore, cylinder imbalance is an issue that can be detected in a laboratory environment, wherein each engine cylinder is instrumented with a dedicated pressure transducer The objective of the work in this paper is to estimating the individual in-cylinder pressure traces in a multi-cylinder engine, relying on a very restricted sensor set, namely a crankshaft speed sensor, a single production-grade pressure sensor. In doing so, a crankshaft model will be developed and a sliding mode observer will be employed to estimate the cylinder pressure using only crankshaft speed fluctuation measurement. Furthermore, as an added enhancement, the cylinder pressure signal from one cylinder will be utilized to adapt the friction and heat release parameters for more accurate estimation in all cylinders.
机译:一项的用于柴油发动机的替代燃烧模式(例如HCCI,PCCI和LTC)的主要问题是在空气和EGR的分布在整个气缸,这最终导致在压力轨迹和每个显著差异指示扭矩有关的不平衡圆筒。原则上,一个圆筒通过缸控制方法可以弥补空气,残差和温度的不平衡。然而,为了从闭环燃烧控制中充分获益,有必要从每个发动机气缸获得反馈,以重建压力轨迹。因此,汽缸不平衡是其中,每个发动机气缸仪表用专用的压力换能器的目标工作在本文可以在实验室环境中被检测到一个问题,就是在多气缸估计个体缸内压力迹线发动机,依靠非常有限的传感器组,即曲轴速度传感器,单个生产级压力传感器。在这样做时,曲轴模型将被开发和滑模观测将采用仅使用曲轴速度波动测量来估计汽缸内压力。此外,作为额外的增强,从一个气缸的气缸压力信号将被利用在所有汽缸中,以适应用于更精确的估计的摩擦和热释放相关的参数。

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