At a given speed and load, the spark advance (SA) is tuned to reach the maximum break torque (MBT) timing to maximize efficiency. The use of exhaust gas recirculation (EGR) can further improve fuel economy at the same speed and load. As EGR increases, MBT moves towards 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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ASME 2017 Internal Combustion Engine Division Fall Technical Conference
October 15–18, 2017
Seattle, Washington, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5832-5
PROCEEDINGS PAPER
Cycle-to-Cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit
Bryan P. Maldonado,
Bryan P. Maldonado
University of Michigan, Ann Arbor, MI
Search for other works by this author on:
Anna G. Stefanopoulou
Anna G. Stefanopoulou
University of Michigan, Ann Arbor, MI
Search for other works by this author on:
Bryan P. Maldonado
University of Michigan, Ann Arbor, MI
Anna G. Stefanopoulou
University of Michigan, Ann Arbor, MI
Paper No:
ICEF2017-3679, V002T05A007; 10 pages
Published Online:
November 30, 2017
Citation
Maldonado, BP, & Stefanopoulou, AG. "Cycle-to-Cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit." Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development. Seattle, Washington, USA. October 15–18, 2017. V002T05A007. ASME. https://doi.org/10.1115/ICEF2017-3679
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