Development and Experimental Validation of an Adaptive, Piston-Damage-Based Combustion Control System for SI Engines: Part 1—Evaluating Open-Loop Chain Performance
Alessandro Brusa,Nicolò Cavina,Nahuel Rojo,Jacopo Mecagni,Enrico Corti,Vittorio Ravaglioli,Matteo Cucchi,Nicola Silvestri +7 more
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This work is focused on the development and validation of a spark advance controller, based on a piston “damage” model and a predictive knock model, which represents an integrated and innovative way to manage both the knock intensity and combustion phase.Abstract:
This work is focused on the development and validation of a spark advance controller, based on a piston “damage” model and a predictive knock model. The algorithm represents an integrated and innovative way to manage both the knock intensity and combustion phase. It is characterized by a model-based open-loop algorithm with the capability of calculating with high accuracy the spark timing that achieves the desired piston damage in a certain period, for knock-limited engine operating conditions. Otherwise, it targets the maximum efficiency combustion phase. Such controller is primarily thought to be utilized under conditions in which feedback is not needed. In this paper, the main models and the structure of the open-loop controller are described and validated. The controller is implemented in a rapid control prototyping device and validated reproducing real driving maneuvers at the engine test bench. Results of the online validation process are presented at the end of the paper.read more
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References
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Knocking combustion in spark-ignition engines
Zhi Wang,Hui Liu,Rolf D. Reitz +2 more
TL;DR: In this paper, the authors provided deep insights into the processes occurring during knocking combustion in spark ignition engines, and future research directions, such as turbulence-shock-reaction interaction theory, detonation suppression and utilization, and super-knock solutions, are also discussed, including use of exhaust gas recirculation (EGR), injection strategy, and the integration of a high tumble - high EGR-Atkinson/Miller cycle.
Journal ArticleDOI
In-Cylinder Pressure Reconstruction Based on Instantaneous Engine Speed Signal
TL;DR: In this article, an original methodology for the instantaneous in-cylinder pressure waveform reconstruction in a spark-ignited internal combustion engine is presented, which is based on the existence of a linear correlation, characterized by frequency response functions, between engine speed signals.
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Likelihood-Based Control of Engine Knock
TL;DR: An analysis of experimental data is used to provide further evidence that knock behaves as a cyclically uncorrelated random process and a new likelihood-based stochastic knock controller is presented.
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Characterization of knock intensity distributions: Part 1: statistical independence and scalar measures
TL;DR: In this paper, an extensive statistical analysis is performed on knock intensity data recorded under a broad range of operating conditions, and it is shown that knock intensity closely approximates a cyclically independent random process.