A Surge and Choke Capable Compressor Flow Model - Validation and Extrapolation Capability
Increasingly stringent emissions legislation combined with consumer
performance demand has created the need for complex automotive
engines. The control of this complex system relies heavily on control
oriented models. Models capable of describing all operating modes of
the systems are beneficial, and the models should be easily
parametrized and enable extrapolation. A large database of automotive
compressor maps is characterized, and used to develop, validate and
automatically parametrize a compressor flow model capable of
describing reversed flow, normal operation and choke. Measurement data
from both an engine test stand and a surge test stand is used to
parametrize and validate the surge capability of the model. The model
is shown to describe all modes of operation with good performance, and
also to be able to extrapolate to small turbo speeds. The
extrapolation capability is important, since compressor maps are shown
to lack information for low speeds, even though they frequently
operate there in an engine installation.
Oskar Leufvén and Lars Eriksson
Control Engineering Practice,
2013
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