Observer Based Feedforward Air-Fuel Control of Turbocharged SI-Engines
Abstract: Air-fuel control on turbocharged (TC) SI-engines require
precise prediction of the cylinder air-charge (CAC). Using an observer
it is possible to both estimate the necessary system states and to
provide a framework to design the necessary CAC feedforward
controller. Here a mean value engine model of a TC SI-engine is used
to develop an observer. The output of the observer is fed as an
initial condition to a predictor which is used for feedforward of the
CAC for air-fuel control. The resulting controller is experimentally
validated on a SAAB 2.0 dm^3 TC engine using tip-in and tip-out
transients. The results show that the excursions in lambda are less
than 5%.
Per Andersson and Lars Eriksson
IFAC World Congress,
2005
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