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Aspects of EGR control on turbocharged light-duty diesel engines
Published May 14, 2002 by Institution of Mechanical Engineers in United Kingdom
This investigation describes an initial exploration of model- based control on EGR systems for DI diesel engines in passenger car application. A CAE model of the engine and EGR valve controller was employed to predict system behavior. Two traditionally used EGR system controllers were assessed by their responses to a step load increase and decrease. A third architecture based on a compressible flow analogy to predict EGR valve mass flow rate is used as an example of model-based control. Model accuracy and practical constraints are highlighted. The appropriate choice of set point for the model- based control during transient engine operation is debated.