2002-01-0237
FEM Approximation of Internal Combustion Chambers for
Knock Investigations
Sönke Carstens-Behrens, Mark Urlaub, and Johann F. Böhme
Ruhr Universität Bochum
Jürgen Förster and Franz Raichle
Robert Bosch GmbH
Copyright © 2002 Society of Automotive Engineers, Inc.
ABSTRACT
The resonances of SI engine combustion chambers are
slightly excited during normal combustion but strongly
excited by knock. In order to avoid knocking combustions
extensive knowledge about knock and its effects is
necessary. In this paper the combustion chamber of a
serial production engine is modeled by finite elements.
Modal analyses are performed in order to gain
information about the resonances, their frequencies, and
their frequency and amplitude modulations. Simulation
results are compared to measured data using a high resolution
time-frequency method. Furthermore, a
connection between knock origin and the excitation of the
resonances is postulated applying transient analyses.
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