Controller Tuning based on Transient Selection and Optimization for a Diesel Engine with EGR and VGT
In modern Diesel engines Exhaust Gas Recirculation (EGR) and Variable
Geometry Turbochargers (VGT) have been introduced to meet the new emission
requirements. A control structure that coordinates and handles
emission limits and low fuel consumption has been developed. This
controller has a set of PID controllers with parameters that need to
be tuned. To be able to achieve good performance, an optimization
based tuning method is developed and tested. In the optimization the
control objectives are captured by a cost function. To aid the tuning
a systematic method has been developed for selecting representative
and significant transients that excite different modes in the
controller. The performance is evaluated on the European Transient
Cycle. It is demonstrated how weighting factors in the cost function
influence control behavior, and that the proposed tuning method gives
a significant improvement in control performance compared to
standardized tuning methods for PID controllers. Further, the proposed
tuning method and the control structure are applied and validated on
an engine in a test cell, where it is demonstrated that the control
structure achieves all stated control objectives.
Johan Wahlström, Lars Eriksson and Lars Nielsen
SAE Technical paper series SP-2159,
2008
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