At a given speed and load, the spark advance (SA) is tuned to reach the maximum brake torque (MBT) timing to maximize efficiency. The use of exhaust gas recirculation (EGR) can further improve fuel economy (FE) at the same speed and load. As EGR increases, MBT moves toward a more advanced timing that can be limited by the high variability in the combustion process, reflected in unacceptable torque fluctuations. This variability is rapidly increased by the random occurrence of partial burns and/or misfires. In order to operate close to the misfire limit, a stochastic misfire controller has been designed to momentarily move from an undesired to an allowable misfire rate, without significantly increasing variability in the combustion process. Control-oriented models for the combustion process and misfire events are discussed. Simulation of the closed-loop system shows that the feedback misfire controller, on average, stays closer to the misfire limit than a more conventional controller designed to react when a misfire is detected.
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October 2018
Research-Article
Cycle-to-Cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit
Bryan P. Maldonado,
Bryan P. Maldonado
Department of Mechanical Engineering,
University of Michigan,
1231 Beal Avenue,
Ann Arbor, MI 48109
e-mail: bryanpm@umich.edu
University of Michigan,
1231 Beal Avenue,
Ann Arbor, MI 48109
e-mail: bryanpm@umich.edu
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Anna G. Stefanopoulou
Anna G. Stefanopoulou
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: annastef@umich.edu
University of Michigan,
1231 Beal Avenue
,Ann Arbor, MI 48109
e-mail: annastef@umich.edu
Search for other works by this author on:
Bryan P. Maldonado
Department of Mechanical Engineering,
University of Michigan,
1231 Beal Avenue,
Ann Arbor, MI 48109
e-mail: bryanpm@umich.edu
University of Michigan,
1231 Beal Avenue,
Ann Arbor, MI 48109
e-mail: bryanpm@umich.edu
Anna G. Stefanopoulou
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: annastef@umich.edu
University of Michigan,
1231 Beal Avenue
,Ann Arbor, MI 48109
e-mail: annastef@umich.edu
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 17, 2018; final manuscript received February 18, 2018; published online July 30, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Oct 2018, 140(10): 102812 (8 pages)
Published Online: July 30, 2018
Article history
Received:
February 17, 2018
Revised:
February 18, 2018
Citation
Maldonado, B. P., and Stefanopoulou, A. G. (July 30, 2018). "Cycle-to-Cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit." ASME. J. Eng. Gas Turbines Power. October 2018; 140(10): 102812. https://doi.org/10.1115/1.4039728
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