A Framework For The Iterative Dynamic
Optimisation Of Diesel Engines: Numerical
Methods, Experimental Setup, And First Results
Author(s)
J. Asprion, G. Mancini, S. Zentner, Ch. H. Onder,
N. Cavina & L. Guzzella
Abstract
Owing to the many degrees of freedom provided by current engine systems and to
the need to consider transient operation, deriving an engine calibration has become
a tedious task. Control trajectories resulting fromthe solution of an optimal-control
problem provide a guideline to the calibration engineer, serve as a benchmark, and
might be used for a partial automation of the calibration procedure. The common
approach to dynamic optimisation consists of solving a single optimal-control
problem. However, this approach requires the availability of models that are valid
throughout the whole engine operating range and actuator ranges. In addition, the
result of the optimisation is meaningful only if the model is very accurate. We
propose a methodology to circumvent those demanding requirements: an iteration
between transient measurements to refine a purpose-built model and a dynamic
optimisation which is constrained to the model-validity region. This paper presents
all numerical methods required to implement this procedure. The crucial steps
are analysed in detail, and the most important caveats are indicated. Finally, an
experimental validation demonstrates the applicability of the method and reveals
the components that require further development.
Keywords: optimal control, engine optimisation, transient operation, mean-value
model, turbocharger, EGR, VGT.
Keywords
optimal control, engine optimisation, transient operation, mean-valuemodel, turbocharger, EGR, VGT.
Related Book
Other papers in this volume
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