Fuel economy and emissions are the two central parameters in heavy duty engines. High exhaust gas recirculation rates combined with turbocharging has been identified as a promising way to increase the maximum load and efficiency of heavy duty spark ignition engines. With stoichiometric conditions, a three way catalyst can be used, which keeps the regulated emissions at very low levels. The Lambda window, which results in very low emissions, is very narrow. This issue is more complex with transient operation, resulting in losing brake efficiency and also catalyst converting efficiency. This paper presents different control strategies to maximize the reliability for maintaining efficiency and emissions levels under transient conditions. Different controllers are developed and tested successfully on a heavy duty six-cylinder port injected natural gas engine. Model predictive control was used to control lambda, which was modeled using system identification. Furthermore, a proportional integral regulator combined with a feedforward map for obtaining maximum brake torque timing was applied. The results show that excellent steady-state and transient performance can be achieved.
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September 2010
Research Papers
Transient Control of Combustion Phasing and Lambda in a Six-Cylinder Port-Injected Natural-Gas Engine
Mehrzad Kaiadi,
Mehrzad Kaiadi
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
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Magnus Lewander,
Magnus Lewander
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
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Patrick Borgqvist,
Patrick Borgqvist
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
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Per Tunestal,
Per Tunestal
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
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Bengt Johansson
Bengt Johansson
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
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Mehrzad Kaiadi
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
Magnus Lewander
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
Patrick Borgqvist
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
Per Tunestal
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, Sweden
Bengt Johansson
Division of Combustion Engines, Faculty of Engineering,
Lund University
, Lund 22437, SwedenJ. Eng. Gas Turbines Power. Sep 2010, 132(9): 092805 (6 pages)
Published Online: June 18, 2010
Article history
Received:
May 25, 2009
Revised:
May 27, 2009
Online:
June 18, 2010
Published:
June 18, 2010
Citation
Kaiadi, M., Lewander, M., Borgqvist, P., Tunestal, P., and Johansson, B. (June 18, 2010). "Transient Control of Combustion Phasing and Lambda in a Six-Cylinder Port-Injected Natural-Gas Engine." ASME. J. Eng. Gas Turbines Power. September 2010; 132(9): 092805. https://doi.org/10.1115/1.4000605
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