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Closed Loop Ignition Control by Ionization Current Interpretation
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8646-8998
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
Mecel AB.
1998 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 106, no SAE Technical Paper 970854, p. 1216-1223Article in journal (Refereed) Published
Abstract [en]

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. 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.

Place, publisher, year, edition, pages
1998. Vol. 106, no SAE Technical Paper 970854, p. 1216-1223
Keywords [en]
Engine Modelling
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-137245DOI: 10.4271/970854Scopus ID: 2-s2.0-33645709993OAI: oai:DiVA.org:liu-137245DiVA, id: diva2:1094316
Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2021-12-16Bibliographically approved
In thesis
1. Spark Advance Modeling and Control
Open this publication in new window or tab >>Spark Advance Modeling and Control
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The spark advance determines the efficiency of spark-ignited (SI) engines by positioning the combustion in relation to the piston motion. Today's spark-advance controllers are open loopsystems that measure parameters that effect the spark-advance setting and compensate for their effects. Several parameters influence the best spark-advance setting but it would be too expensive to measure and account for all of them. This results in a schedule that is a compromise since it has to guarantee good performance over the range of all the nonmeasured parameters. A closed-loop scheme instead measures the result of the actual spark advance and maintains an optimal spark-advance setting in the presence of disturbances. To cover this area two questions must be addressed: How to determine if the spark advance is optimal and how it can be measured? This is the scope of the present work.

One possible measurement is the in-cylinder pressure, which gives the torque, but also contains important information about the combustion. The cylinder pressure can accurately be modeled using well known single-zone thermodynamic models which include the loss mechanisms of heat transfer and crevice flows. A systematic procedure for identifying heatrelease model parameters is presented.

Three well-known combustion descriptors have been presented in the literature that relate the phasing of the pressure signal to the optimal ignition timing. A parametric study was performed showing how changes in model parameters influence the combustion descriptors at optimum ignition timing.

Another possible measurement is the ionization current that uses the spark plug as a sensor, when it is not used for ignition. This is a direct in-cylinder measurement which is rich in information about the combustion. A novel approach to spark-advance controlis presented, which uses the ionization current as a sensed variable. The feedback control scheme is closely related to schemes based on in-cylinder pressure measurements, that earlier have reported good results. A key idea in this approach is to fit a model to the measured ionization current signal, and extract information about the peak pressure position from the model parameters.

The control strategy is validated on an SI production engine, demonstrating that the spark-advance controller based on ionization current interpretation can control the peak pressure position to desired positions. A new method to increase engine efficiency is presented,by using the closed-loop spark-advance control strategy in combination with active water injection. However, the major result is that the controller maintains an optimal spark advance under various conditions and in the presence of environmental disturbances such as air humidity.

Place, publisher, year, edition, pages
Linköping: Linköping University, 1999. p. 20
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 580
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-181863 (URN)9172194790 (ISBN)
Public defence
1999-05-12, ISY:s seminarierum, B-huset, Linköpings universitet, Linköping, 10:15
Available from: 2021-12-16 Created: 2021-12-16 Last updated: 2021-12-16Bibliographically approved

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Eriksson, LarsNielsen, Lars

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