Control of the low-load region in partially premixed combustion

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Partially premixed combustion (PPC) is a low temperature, direct-injection combustion concept that has shown to give promising emission levels and efficiencies over a wide operating range. In this concept, high EGR ratios, high octane-number fuels and early injection timings are used to slow down the auto-ignition reactions and to enhance the fuel and are mixing before the start of combustion. A drawback with this concept is the combustion stability in the low-load region where a high octane-number fuel might cause misfire and low combustion efficiency. This paper investigates the problem of low-load PPC controller design for increased engine efficiency. First, low-load PPC data, obtained from a multi-cylinder heavy- duty engine is presented. The data shows that combustion efficiency could be increased by using a pilot injection and that there is a non-linearity in the relation between injection and combustion timing. Furthermore, intake conditions should be set in order to avoid operating points with unfavourable global equivalence ratio and in-cylinder temperature combinations. Model predictive control simulations were used together with a calibrated engine model to find a gas-system controller that fulfilled this task. The findings are then summarized in a suggested engine controller design. Finally, an experimental performance evaluation of the suggested controller is presented.


Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik
Titel på värdpublikationJournal of Physics: Conference Series
Undertitel på gästpublikationproceedings of 13th International Conference on Motion and Vibration Control (MOVIC 2016)
FörlagIOP Publishing
Antal sidor15
StatusPublished - 2016 okt 3
Peer review utfördJa
EvenemangMovic & Rasd 2016: 13th International Conference on Motion and Vibration Control, 12th International Conference on Recent Advances in Structural Dynamics - Southampton, Storbritannien
Varaktighet: 2016 jul 32016 jul 6


KonferensMovic & Rasd 2016

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