Modeling and validation of a boost pressure actuation system for a series sequentially turbocharged SI engine
An actuation system for flexible control of an advanced turbocharging
system is studied. It incorporates a vacuum pump and tank that are
connected to pulse width modulation controlled vacuum valves. A
methodology for modeling the entire boost pressure actuation system is
developed. Emphasis is placed on developing component models that are
easily identified from measured data, without the need for expensive
measurements. The models have physical interpretations that enable
handling of varying surrounding conditions. The component models and
integrated system are evaluated on a two stage series sequential turbo
system with three actuators having different characteristics. Several
applications of the developed system model are presented, including a
nonlinear compensator for voltage disturbance rejection where the
performance of the compensator is demonstrated on an engine in a test
cell. The applicability of the complete system model for control and
diagnosis of the vacuum system is also discussed.
Andreas Thomasson, Oskar Leufvén, Ivan Criscuolo and Lars Eriksson
Control Engineering Practice,
2013
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