This paper analyzes low-speed pre-ignition (LSPI), a sudden pre-ignition phenomenon that occurs in downsized boosted gasoline engines in low engine speed high-load operation regions.This research visualized the in-cylinder state before the start of LSPI combustion and observed the behavior of particles, which are thought to be the ignition source. The research also analyzed pre-ignition by injecting deposit flakes and other combustible particulate substances into the combustion chamber. The analysis found that these particles require at least two combustion cycles to reach a glowing state that forms an ignition source. As a result, deposits peeling from combustion chamber walls were identified as a new mechanism causing pre-ignition.Additionally, results also suggested that the well-known phenomenon in which the LSPI frequency rises in accordance with greater oil dilution may also be explained by an increase in deposit generation.
Study of Low-Speed Pre-Ignition in Boosted Spark Ignition Engine
Sae Int. J. Engines
SAE 2014 World Congress & Exhibition ; 2014
Sae International Journal of Engines ; 7 , 2 ; 584-594
2014-04-01
11 pages
Aufsatz (Konferenz)
Englisch
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