Closed-loop combustion control by extremum seeking in SI engines operating with the passive pre-chamber ignition concept 2020-01-1142
The passive pre-chamber ignition concept has shown the potential of increasing the combustion efficiency at high load by allowing more advanced combustion phasing due to its rapid combustion process. The optimization of the spark advance and the dilution rate is currently a challenging task that would allow these type of engines to maintain spark ignited (SI) engines pollutants with even higher combustion efficiencies than diesel engines.
This paper is focused on the automatic calibration of a SI engine, when using the passive pre-chamber ignition concept. The sensitivity of the combustion efficiency to spark advance and dilution rate has been studied and an extremum seeking approach has been designed to optimize the contol inputs by rejecting disturbances and maintaining certain limitations of knock, cycle-to-cycle variability, and misfires. Results highlight the potential of this concept to improve the combustion efficiency in SI engines, specially at high loads.
Ricardo Novella, Benjamin Pla, Pau Bares, Pablo José Martinez-Hernandiz