Control of the low-load region in partially premixed combustion

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


title = "Control of the low-load region in partially premixed combustion",
abstract = "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.",
author = "Gabriel Ingesson and Lianhao Yin and Rolf Johansson and Per Tunest{\aa}l",
year = "2016",
month = "10",
day = "3",
doi = "10.1088/1742-6596/744/1/012106",
language = "English",
volume = "744",
booktitle = "Journal of Physics: Conference Series",
publisher = "IOP Publishing",
address = "United Kingdom",
edition = "1",