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CNR ExploRA
Article . 2009
Data sources: CNR ExploRA
https://doi.org/10.4271/2009-0...
Conference object . 2009 . Peer-reviewed
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Experimental Investigation on the Use of Ion Current on SI Engines for Knock Detection

Authors: Veniero Giglio; Giuseppe Police; Natale Rispoli; Alessandro di Gaeta; Michele Cecere; Livia Della Ragione;

Experimental Investigation on the Use of Ion Current on SI Engines for Knock Detection

Abstract

A system for both ignition and ion current measurement was designed and set up at Istituto Motori. Particular attention was paid to the problem of dissipating the residual energy stored in the ignition coil, reducing the electromagnetic interferences and especially improving the response of the measurement system. In order to assess the capability of the ion current signal to give reliable and accurate information for knock detection, a number of tests were carried out at full load on a commercial PFI four-cylinder engine, at various air/fuel ratios and spark timings. Some knock indices based on the ionization signal, both band pass filtered and non-filtered, were introduced, in particular: the Amplitude of the Second Ionization Peak (ASIP), the Mean not-filtered Ionization Current signal (MIC), the Maximum Amplitude of Ionization Current signal Oscillation (MAICO), the Integral of Modulus of filtered Ionization Current signal Oscillation (IMICO). The thresholds of the MAPO (Maximum Amplitude of Pressure Oscillation) knock index, based on the band pass-filtered pressure signal, were used to classify no-knocking and light-knocking cycles. A criterion based on the Percentage of Knocking Cycles was proposed to evaluate the MAPO-equivalent thresholds of the considered indices to classify the knock type. In particular, thresholds for the MAICO and IMICO indices were found, allowing a fairly good classification of no-knocking and light-knocking cycles based on ion current measurement.

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Italy
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Top 10%
Top 10%
Average