Trade-Offs in Highly Dynamical Transient Simulation on Engine Test-Benches
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SAE World Congress, April 16-19, 2007, Detroit, Michigan, USA.
The trend to reduced development times represents a strong motivation for an extended use of dynamical engine test benches, which are used to reproduce
driving conditions typically measured in the vehicle. To reproduce the engine load conditions a complex control system is used, which has an inherently different nature
in comparison with the vehicle driving conditions and consequently also limitations. As a consequence, the set
of possible transients is limited by the actuator limitations and the bandwidth of the control loops.
Outside the admissible transients it is necessary to do a trade-off between goals, mainly between the precision of
the reproduction of the engine speed and the precision of the load torque tracking. In this paper we discuss how
to calculate the admissible set and how to do a trade off.
Based on these cognitions we present a feedforward control algorithm which allows best performance transients simulation along the performance limits.
Measurement results of the control of dynamical engine test bench with a BMW M47D diesel engine verify the method.