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Ion-Current Measurement in Small Two-Stroke SI Engines
Technical Paper
2008-32-0037
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The cyclic changes of the cylinder pressure are mainly influenced by the primary inflammation phase, which in turn depends on the local air/fuel ratio and the residual-gas fraction at the spark plug. The ion-current measurement technique is based on the conductivity of the mixture during the internal combustion. It is therefore possible to use the signal for combustion diagnostics when using the spark plug as a sensor.
This article demonstrates the potential of ion sensing at the spark plug and in the combustion chamber to detect sources of interference which prevent an optimal combustion process. Comparing the ion signals of consecutive combustion cycles delivers explanations of phenomena that could not yet be sufficiently characterized by cylinder-pressure indication. The results allow new fundamental approaches to the optimization of the combustion process.
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Authors
- Kai W. Beck - Universität Karlsruhe (TH)
- Sören Bernhardt - Universität Karlsruhe (TH)
- Ulrich Spicher - Universität Karlsruhe (TH)
- Tim Gegg - Andreas STIHL AG & Co. KG
- Armin Kölmel - Andreas STIHL AG & Co. KG
- Andreas Paa - Andreas STIHL AG & Co. KG
- Tycho Weissgerber - Pulse GmbH, NL
- Marc Westecker - Pulse GmbH, NL
Citation
Beck, K., Bernhardt, S., Spicher, U., Gegg, T. et al., "Ion-Current Measurement in Small Two-Stroke SI Engines," SAE Technical Paper 2008-32-0037, 2008, https://doi.org/10.4271/2008-32-0037.Also In
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