Robust Nonlinear EGR and VGT Control with Integral Action for Diesel Engines
A robust non-linear multivariable control design with integral action
is proposed and investigated for control of EGR valve and VGT position
in heavy duty diesel engines. The main control goal is to regulate
oxygen/fuel ratio and intake manifold EGR-fraction. These are chosen
as main performance variables since they are strongly coupled to the
emissions. A recently developed non-linear control design based on
feedback linearization is extended with integral action. The nonlinear
controller gives an inner loop with good stability and robustness
properties. It is shown that integral action is necessary to handle
model errors so that the controller can track the performance
variables specified in the outer loop. In particular the control
design method utilizes a control Lyapunov function and inverse optimal
control, which results in a control law with robustness properties
interpretable as gain and phase margins. Furthermore, comparisons by
simulation also show that the proposed control design successfully
handles non-linear effects.
Johan Wahlström and Lars Eriksson
IFAC World Congress,
2008
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