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Modeling effects due to varying command signal timing
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
1998 (English)In: IFAC Proceedings Volumes, 1998, Vol. 31, 175-179 p.Conference paper, Published paper (Refereed)
Abstract [en]

Engine models has a basic role in fuel control, and Shafai et al have recently reported excellent results using a first order system with a time delay. The fractional time delay plays a crucial in their work. Given their success, it is interesting to look at some principle issues depending on different engine models and different ways of actuator timing. Experiments on other engines may e.g. give models of second order. In addition there is random component of the time delay, which vary due to the coordination between event based processes and time based processes. A result is that even with no process noise and no measurement noise, the variation in fractional time delay can cause errors in the parameter identification. It is shown that the resulting errors can not be modeled as a moving average of white noise. Further, there is always a zero that drifts towards the unit circle along the negative real axis, and there may also be other zeros and poles drifting if the choice of method with associated parameters are not made properly. In conclusion, such observations are important when designing fuel control for engines.

Place, publisher, year, edition, pages
1998. Vol. 31, 175-179 p.
Keyword [en]
Engine Modelling
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-138187DOI: 10.1016/S1474-6670(17)42196-3OAI: oai:DiVA.org:liu-138187DiVA: diva2:1108455
Conference
IFAC Workshop – Advances in Automotive Control (Preprints)
Available from: 2017-06-12 Created: 2017-06-12 Last updated: 2017-07-25Bibliographically approved

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Henriksson, TomasNielsen, Lars
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Citation style
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