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Analysis of SI combustion diagnostics methods using ion-current sensing techniques
conference contribution
posted on 2011-05-25, 13:52 authored by Dimitris Panousakis, Andreas Gazis, Jill Patterson, Rui ChenClosed-loop electronic control is a proven and efficient way
to optimize spark ignition engine performance and to
control pollutant emissions. In-cylinder pressure sensors
provide accurate information on the quality of combustion.
The conductivity of combustion flames can alternatively be
used as a measure of combustion quality through ioncurrent
measurements. In this paper, combustion
diagnostics through ion-current sensing are studied. A
single cylinder research engine was used to investigate the
effects of misfire, ignition timing, air to fuel ratio,
compression ratio, speed and load on the ion-current
signal. The ion-current signal was obtained via one, or
both, of two additional, remote in-cylinder ion sensors
(rather than by via the firing spark plug, as is usually the
case). The ion-current signals obtained from a single
remote sensor, and then the two remote sensors are
compared.
Ion-current signal interpretation was then conducted using
an artificial neural network strategy (using adaptive linear
networks) to interpret the measured signals, and also to
predict the associated cylinder pressures. The combination
of remote sensors with a linear neural network gives a
more accurate and ‘noise’ free signal that can be
processed at greater speed through computationally
inexpensive methods.
The computed results agree well with measured cylinder
pressures under all analyzed conditions. It will be shown
that ion-current signals can be used to directly diagnose
combustion abnormalities (and as such could suitable as
part of a closed loop control strategy), even though the
effects of ignition timing, air to fuel ratio, and compression
ratio on ion-current were more complex.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
PANOUSAKIS, D. ... et al, 2006. Analysis of SI combustion diagnostics methods using ion-current sensing techniques. IN: Proceedings of SAE 2006 World Congress, Detroit, USA, 3rd-6th April.Publisher
© SAE InternationalVersion
- VoR (Version of Record)
Publication date
2006Notes
This is a conference paper [2006 © SAE International]. It was posted on this site with permission from SAE International. Further use and distribution of this paper requires permission from SAE International.ISSN
0148-7191Publisher version
Book series
SAE Technical Papers;2006-01-1345Language
- en