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On-Line Optimization of Dual-Fuel Combustion Operation by Extremum Seeking Techniques
Technical Paper
2021-01-0519
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
Language:
English
Abstract
Dual-fuel combustion engines have shown the potential to extend the operating range of Homogeneous Charge Compression Ignition (HCCI) by using several combustion modes, e.g. Reactivity Controlled Compression Ignition (RCCI) at low/medium load, and Partially Premixed Compression (PPC) at high load. In order to optimize the combustion mode operation, the respective sensitivity to the control inputs must be addressed. To this end, in this work the extremum seeking algorithm has been investigated. By definition, this technique allows to detect the control input authority over the system by perturbing its value by a known periodic signal. By analyzing the system response and calculating its gradient, the control input can be adjusted to reach optimal operation. This method has been applied to a dual-fuel engine under fully, highly and partially premixed conditions where the feedback information was provided by in-cylinder pressure and NOx sensors. The gasoline fraction and the injection timing were selected as control inputs and an extremum seeking controller was designed and verified to optimize brake efficiency by tracking the ideal combustion phasing and to reduce NOx emissions as well.
Authors
Citation
Pla, B., Bares, P., Barbier, A., and Guardiola, C., "On-Line Optimization of Dual-Fuel Combustion Operation by Extremum Seeking Techniques," SAE Technical Paper 2021-01-0519, 2021, https://doi.org/10.4271/2021-01-0519.Data Sets - Support Documents
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