Optimal Transient Control of a Heavy Duty Diesel Engine with EGR and VGT
Optimal control of a heavy duty diesel engine with EGR and VGT during transients
is investigated. Minimum time and fuel optimal control problems are de ned for transients from
low to high output torque. A validated diesel engine model is used with minor changes in order
to be suitable for the selected solver. The problem is solved for several feasible minimum EGR
fractions and smoke-limiter values in order to provide comparisons. The optimization results
show that the smoke-limiter has great e ect on the transient duration while the required EGR
fraction in
uences the control signals' shape. The fuel optimal control keeps the control actuators
more closed than the time optimal, however both time and fuel optimal results become very
similar when high EGR fractions and smoke-limiter values are required.
Xavier Llamas and Lars Eriksson
2014
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