Modeling of a Diesel Engine with VGT and EGR including Oxygen Mass Fraction
A mean value model of a diesel engine with VGT and EGR and that
includes oxygen mass fraction is developed and validated. The
intended model applications are system analysis, simulation, and
development of model-based control systems. Model equations and
tuning methods are described for each subsystem in the model. In
order to decrease the amount of tuning parameters, flows and
efficiencies are modeled using physical relationships and parametric
models instead of look-up tables. The static models have mean
relative errors that are equal to or lower than 6.1%. Static and
dynamic validations of the entire model show that the mean relative
errors are less than 12%. The validations also show that the
proposed model captures the essential system properties, i.e. a
non-minimum phase behavior in the transfer function EGR-valve to
intake manifold pressure and a non-minimum phase behavior, an
overshoot, and a sign reversal in the transfer function VGT to
compressor mass flow.
Johan Wahlström and Lars Eriksson
2006

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