A Parametric Model for Ionization Current in a Four Stroke SI Engine
A Parametric Model for Ionization Current in a Four Stroke SI Engine
J. Dyn. Sys., Meas., Control -- March 2009 -- Volume 131, Issue 2, 021001 (11 pages)
doi:10.1115/1.3023119
Author(s):
Ingemar Andersson
Signal Processing Group, Department of Signals and Systems
Chalmers University of Technology, Gothenburg SE-41296, Sweden
Lars Eriksson
Vehicular Systems, Department of Electrical Engineering
Linkoping University, Linkoping SE-58183, Sweden
Abstract:
A model for the thermal part of an ionization signal is presented that
connects the ionization current to cylinder pressure and temperature in a
spark ignited internal combustion engine. One strength of the model is that,
after calibration, it has only two free parameters: burn angle and initial
kernel temperature. By fitting the model to a measured ionization signal, it
is possible to estimate both cylinder pressure and temperature, where the
pressure is estimated with good accuracy. The model approach is validated on
engine data. Cylinder pressure and ionization current data were collected on
a Saab four-cylinder spark ignited engine for a variation in ignition timing
and air-fuel ratio. The main result is that the parametrized ionization
current model can be used to estimating combustion properties as pressure,
temperature, and content of nitric oxides based on measured ionization
currents. The current status of the model is suitable for off-line analysis
of ionization currents and cylinder pressure. This ionization current model
not only describes the connection between the ionization current and the
combustion process, but also offers new possibilities for engine management
system to control the internal combustion engine.
Ingemar Andersson and Lars Eriksson
ASME Journal of Dynamic Systems, Measurement, and Control,
2009
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