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A Real-Time Platform for Spark Advance Control
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8646-8998
1997 (English)Report (Other academic)
Abstract [en]

With the aim at spark advance control, a method for estimating the peak pressure position (PPP) from the ionization current has previously been developed and off-line validated. To implement the concept on an engine a real-time platform is needed. A hardware platform, that consists of a PC, an electronic engine control unit (ECU), and a synchronization circuit, is described. The platform synchronizes the data acquisition with the engine and the functionality is validated. Also a refined interpretation algorithm for estimating the PPP is described and validated to give a good estimate. The algorithm is suitable for implementation on the described real-time platform.

Place, publisher, year, edition, pages
Linköping: Department of Electrical Engineering , 1997. , p. 15
Series
LiTH-ISY-R, ISSN 1400-3902 ; 1938
Keywords [en]
In-cylinder pressure, ionization current, peak pressure position
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-139743ISRN: LITH-ISY-R-1938OAI: oai:DiVA.org:liu-139743DiVA, id: diva2:1131586
Available from: 2017-08-15 Created: 2017-08-15 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, Lars

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