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Abstract



Closed Loop Ignition Control by Ionization Current Interpretation


The main result of this paper is a real-time closed loop demonstration of spark advance control by interpretation of ionization current signals. The advantages of such a system is quantified. The ionization current, obtained by using the spark plug as a sensor, is rich on information, but the signal is also complex. A key step in our method is to use parameterized functions to describe the ionization current \cite{Eriksson:1996}.

The results are validated on a SAAB 2.3 l, normally aspirated, production engine, showing that the placement of the pressure trace relative to TDC is controlled using only the ionization current for feedback.

Lars Eriksson, Lars Nielsen and Mikael Glavenius

1997

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