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Influence of Calcium-Based Additives with Different Properties on Abnormal Combustion in an SI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 08, 2016 by SAE International in United States
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Technologies for further improving vehicle fuel economy have attracted widespread attention in recent years. However, one problem with some approaches is the occurrence of abnormal combustion such as low-speed pre-ignition (LSPI) that occurs under low-speed, high-load operating conditions. One proposed cause of LSPI is that oil droplets diluted by the fuel enter the combustion chamber and become a source of ignition. Another proposed cause is that deposits peel off and become a source of ignition. A four-stroke air-cooled single-cylinder engine was used in this study to investigate the influence of Ca-based additives having different properties on abnormal combustion by means of in-cylinder visualization and absorption spectroscopic measurements. The results obtained for neutral and basic Ca-based additives revealed that the former had an effect on advancing the time of autoignition.
CitationShimizu, K., Takahata, S., Miura, K., Shoji, H. et al., "Influence of Calcium-Based Additives with Different Properties on Abnormal Combustion in an SI Engine," SAE Technical Paper 2016-32-0007, 2016, https://doi.org/10.4271/2016-32-0007.
- Morgan, R., Scullion, P., Nix, L., Kan, C. et al., "Injury Risk Investigation of the Small, Rear-seat Occupant in Side Impact," SAE Int. J. Passeng. Cars - Mech. Syst. 5(1):61-75, 2012, doi:10.4271/2012-01-0092.
- Takeuchi, K., et al., “Investigations of Engine Oil Effect on Abnormal Combustion in Turbocharged Direct Injection-Spark Ignition Engines (Part 1): Preventing or Contributing to Low-Speed Pre-Ignition through Effects of Engine Oil Additives,” Proceedings of JSAE Spring Convention, No. 70-12, pp. 1-4, (2012) (in Japanese).
- Miyasaka, T., Miura, K., Hayakawa, N., Ishino, T. et al., "A Study on the Effect of a Calcium-Based Engine Oil Additive on Abnormal SI Engine Combustion," SAE Int. J. Engines 8(1):206-213, 2015, doi:10.4271/2014-32-0092.
- Hayakawa, N., Miura, K., Miyasaka, T., Ishino, T. et al., "A Study on the Effect of Zn- and Mo-Based Engine Oil Additives on Abnormal SI Engine Combustion using In-Cylinder Combustion Visualization," SAE Int. J. Engines 8(1):214-220, 2015, doi:10.4271/2014-32-0096.
- Miura, K., Shimizu, K., Hayakawa, N., Miyasaka, T. et al., "Influence of Ca-, Mg- and Na-Based Engine Oil Additives on Abnormal Combustion in a Spark-Ignition Engine," SAE Int. J. Engines 9(1):452-457, 2016.
- Gaydon, A. G., The Spectroscopy of Flames, 2nd Edition, London, Chapman and Hall Ltd, p. 371 (1974).