Engine operating conditions and fuel properties on pre-spark heat release and SPI promotion in SI engines

Paper #:
  • 2017-01-0688

Published:
  • 2017-03-28
Abstract:
This work explores the dependence of fuel ignition delay on stochastic pre-ignition (SPI). Findings are based on bulk gas thermodynamic state, where the effects of pre-spark heat release (PSHR) are correlated to SPI tendency and magnitude. Specifically, residual gas and low temperature chemistry effects and observations are explored, which are found to be indicative of bulk gas conditions required for strong SPI events. Events analyzed range from non-knocking SPI to full detonation SPI events in excess of 325 bar peak cylinder pressure. The work illustrates that singular SPI event count and magnitude are found to be proportional to PSHR of the bulk gas mixture and residual gas fraction. Cycle-to-cycle variability in trapped residual mass and temperature are found to impose variability in singular SPI event count and magnitude. However, clusters and short lived bursts of multiple SPI events are found to better correlate with lubricant properties, specifically lubricant calcium content. The results highlight the interplay of bulk gas thermodynamics on SPI event magnitude and sensitivity to operating conditions, while lubricant properties were found to better correlate to cluster event propensity and cluster magnitude.
Also in:
  • SAE International Journal of Engines - V126-3EJ
  • SAE International Journal of Engines - V126-3
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