This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Simulation Models for Engine Development
Technical Paper
785076
Sector:
Language:
German
Abstract
Digital simulation of engine processes employs mathematical
models comprised of linear, differential equations. Such models
must not unconditionally yield exact, absolute values of processes;
often, only changes in values are required and these can be
provided fairly accurately. For evaluating an actual system,
however, it is necessary to provide as accurate of input values as
possible. Furthermore, different simulation models should be
developed for different tasks; universal models are not well suited
to most applications.
The paper applies a model to three different sets of engine
processes. Optimization of processes in unsupercharged engines with
undivided combustion chambers requires a combustion model with
well-simulated ignition delay. Optimization of supercharged systems
or gas exchange processes requires a general process model with
accurate representation of flow parameters. Engines with
precombustion chambers demand more complicated models and engine
geometry becomes especially important. Each of these systems is
discussed with respect to modeling differences and results.