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.
Cycle-to-Cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit
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.
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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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