IMPLICATION OF CYCLE-TO-CYCLE VARIABILITY IN SI ENGINES
Keywords:
SI Engine, Cycle-to-Cycle Variability, Adaptive Combustion Model, Spark Timing, Ignition Delay, Variability Factor, Fuel ConsumptionAbstract
The paper deals with utilization of an adaptive combustion model in order to simulate cycle‐to‐cycle combustion variability of SI engines. The used empirical adaptive combustion model consists of two parts: the first part for ignition delay prediction and the second part for in‐cylinder combustion process description. There is proved mutual independence of these two phases and shown their characteristics in terms of cycle‐to‐cycle variability. The practical utilization of the cycle‐to‐cycle variability simulation is demonstrated by computational analysis of various variability levels at different engine operational points in order to assess its impact on engine fuel consumption. The calculation results are generalized for SI gasoline engines independent of both engine load and combustion rate as well.
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