PID controllers and their tuning for EGR and VGT control in diesel engines
A PID structure is proposed and investigated for coordinated control of
EGR-valve and VGT-position in heavy duty diesel engines. Control goals are to
fulfill the legislated emission levels and safe operations of the engine and the
turbocharger. These goals are achieved through regulation of the following
performance variables: normalized air/fuel ratio lambda, intake manifold
EGR-fraction as well as turbocharger speed. A systematic tuning strategy for the
PID controllers is also developed and the tuning rules and their performance is
successfully illustrated on a demanding part of the European Transient Cycle.
Further, it is demonstrated that the VGT-position to turbocharger speed loop
does benefit from a derivative part in order to predict high turbocharger
speeds. This is due to the large time constant in the corresponding open-loop
transfer function.
Johan Wahlström, Lars Eriksson, Lars Nielsen and Magnus Pettersson
IFAC World Congress,
2005
Page responsible: webmaster
Last updated: 2021-11-10