Non-linear observer of laminar flame speed for multi-fuel adaptive spark-ignition engines Online publication date: Sat, 21-Jun-2014
by Baitao Xiao; Robert Prucka
International Journal of Powertrains (IJPT), Vol. 3, No. 2, 2014
Abstract: This research develops a virtual laminar flame speed sensor that can be used for model-based control of multi-fuel adaptive spark-ignition engines. Laminar flame speed is emphasised because it is a primary physical parameter related to ignition timing prediction, and it will change if a different fuel source is used. The observer (virtual sensor) outputs an estimate of laminar flame speed for an arbitrary fuel based on the burn-rate difference to a baseline case, using an inverse quasi-dimensional turbulent flame entrainment model with in-cylinder pressure feedback. A real-time model re-calibration method for laminar flame speed prediction is also proposed. The process is intended to support model-based feed-forward ignition timing control. The method is described in detail and validated experimentally with both E85 and gasoline.
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