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Investigation into Occurrence of Megaknock and Auto-Ignition in GTDI Engines
Technical Paper
2017-01-0690
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The performance of boosted gasoline engines is limited at high loads by knock, stochastic Low Speed Pre-Ignition, and Megaknock. An investigation has been carried out on the occurrence of abnormal combustion and megaknock in a 1.6 L GTDI engine with the aim to determine the causes of such phenomena. A classification of abnormal combustion events and causes is presented in order to facilitate a consistent terminology. The experiments specifically focus on the effects of exhaust residual gas on occurrence of megaknock in multi-cylinder engines. The results showed that while a misfire will not lead to megaknock, a very late combustion in one cycle, in one cylinder may lead to megaknock in the following cycle in the same or adjacent cylinder. Additionally, a recently developed multi-zone model was used to analyze the role of residual gas on auto-ignition. It was found that residual gas from a late combustion event may in fact lead to auto-ignition in the following cycle; the composition of the residual gas and the presence of partially burned hydrocarbon species were found to be critical.
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Khosravi, M., Ruhland, H., Lorenz, T., and Weber, C., "Investigation into Occurrence of Megaknock and Auto-Ignition in GTDI Engines," SAE Technical Paper 2017-01-0690, 2017, https://doi.org/10.4271/2017-01-0690.Data Sets - Support Documents
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