Optimal and real-time control potential of a diesel-electric powertrain
Real-time control strategies and their performance related to the optimal control
trajectories for a diesel-electric powertrain in transient operation are studied. The considered
transients are steps from idle to target power. A non-linear four state-three input mean value
engine model, incorporating the important turbocharger dynamics, is used for this study. The
strategies are implemented using the SAE J1939-standard for engine control and evaluated
compared to both the optimal solution and the solution when the engine is restricted to follow its
stationary optimal line. It is shown that with the control parameters tuned for a speci c criteria
both engine control strategies in the SAE J1939-standard, speed control and load control, can
achieve almost optimal results, where engine load controlled shows a better trade-o between
fuel economy and duration. The controllers are then extended and it is shown that it is possible
to control the powertrain in a close to optimal way using the SAE J1939-standard, both with
the engine speed and load controlled. However the mode where the engine is load controlled is
seen to be more robust.
Martin Sivertsson and Lars Eriksson
2014
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Last updated: 2021-11-10
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