Control of the low-load region in partially premixed combustion

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 th...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-10, Vol.744 (1), p.12106
Main Authors: Ingesson, Gabriel, Yin, Lianhao, Johansson, Rolf, Tunestal, Per
Format: Article
Language:English
Subjects:
Combustion efficiency
Combustion stability
Control systems design
Controllers
Cylinders
Efficiency
Equivalence ratio
Fuels
Low temperature
Octane
Performance evaluation
Physics
Predictive control
Spontaneous combustion
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/744/1/012106