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A Cylinder Pressure-Based Knock Detection Method for Pre-chamber Ignition Gasoline Engine
ISSN: 1946-3936, e-ISSN: 1946-3944
Published February 26, 2021 by SAE International in United States
Citation: Palakunnummal, M., Priyadarshi, S., Ellis, M., and Nazha, M., "A Cylinder Pressure-Based Knock Detection Method for Pre-chamber Ignition Gasoline Engine," SAE Int. J. Engines 14(3):405-417, 2021, https://doi.org/10.4271/03-14-03-0024.
A pre-chamber ignition system has the potential to reduce the burn duration of lean-burn gasoline engine combustion and can achieve a reduced knock occurrence from the distributed ignition sources. Pre-chamber ignition produces high-velocity turbulent jets, and these jets often reach sonic velocity and produce shock waves inside the combustion chamber. These shock waves make knock detection difficult with a conventional surface-mounted acoustic knock sensor. This article discusses how an acoustic knock sensor works with a pre-chamber ignition and evaluates different cylinder pressure-based knock detection strategies and proposes a method that eliminates the influence of jet-induced oscillations on knock detection.