A Methodology to Mimic Cycle to Cycle Variations and to Predict Knock Occurrence through Numerical Simulation

2014-01-1070

04/01/2014

Event
SAE 2014 World Congress & Exhibition
Authors Abstract
Content
In this paper a novel approach to mimic through numerical simulation Cycle-to-Cycle Variations (CCV) of the combustion process of Spark Ignition (SI) engines is described. The proposed methodology allows to reproduce the variability in combustion which is responsible for knock occurrence and thus to replicate the stochastic behavior of this abnormal combustion phenomenon.
On the basis of the analysis of a comprehensive database of experimental data collected on a typical European downsized and turbocharged SI engine, the proposed approach was demonstrated to be capable to replicate in the simulation process the same percentage of knocking cycles experimentally measured in light-knock conditions, after a proper calibration of the Kinetics-Fit (KF), a new phenomenological knock model which was recently developed by Gamma Technologies.
Finally, the capability of the proposed methodology, coupled with the usage of the KF knock model, to correctly identify the Knock Limited Spark Advance (KLSA) on the basis both of the CCV-replicating model and of a more traditional average-cycle simulation was assessed over a wide range of different operating conditions, thus confirming its reliability and robustness.
Meta TagsDetails
DOI
https://doi.org/10.4271/2014-01-1070
Pages
14
Citation
Millo, F., Rolando, L., Pautasso, E., and Servetto, E., "A Methodology to Mimic Cycle to Cycle Variations and to Predict Knock Occurrence through Numerical Simulation," SAE Technical Paper 2014-01-1070, 2014, https://doi.org/10.4271/2014-01-1070.
Additional Details
Publisher
Published
Apr 1, 2014
Product Code
2014-01-1070
Content Type
Technical Paper
Language
English