Tuning and experimental evaluation of a likelihood-based engine knock controller
A new likelihood-based stochastic knock controller, that achieves a
significantly improved regulatory response relative to conventional
strategies, while also maintaining a rapid transient response is
presented. Up until now it has only been evaluated using simulations
and the main contribution here is the implementation and validation of
the knock controller on a five cylinder engine with variable
compression ratio. Furthermore, an extension of the fast response
strategy and a re-tuning of the controller is shown to improve
performance. The controller is validated with respect to its
robustness to changes in engine operating condition as well as
compression ratio. The likelihood-based controller is demonstrated in
engine tests and compared to a conventional controller and it is shown
that it is able to operate closer to the knock limit with less
variations in control action without increasing the risk of engine
damage.
Andreas Thomasson, Lars Eriksson, Tobias Lindell, James Peyton Jones, Jill Spelina and Jesse Frey
2013
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