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Stefan Jakubek, Nikolaus Keuth, Franz Bamer
Extended Nonlinear-Adaptive Engine Fuel Supply Control for Spark Ignition Engines
This article describes two new methods for improved internal combustion (IC)-engine fuel supply control. The first deals with stationary control errors. This type of error is introduced by incorrect volumetric efficiency information as well as from faulty air flow measurements. The second method reduces transient errors. During acceleration phases liquid fuel film deposits are formed on the intake manifold walls, which leads to a lean mixture. To compensate for this effect an additional acceleration mass was introduced which is computed by a discrete filter. The major problem with this approach was to find a suitable and robust way to adapt the filter parameters based on the available λ-measurements. The capability of the presented approaches together with the adaptation algorithms is demonstrated by means of various simulation results using a physical car engine model. The adaptation produces excellent results in all engine operating points with a maximum λ-deviation of approximately one percent.
at – Automatisierungstechnik, Oldenbourg Wissenschaftsverlag
Print ISSN: 0178-2312
Volume: 52, 03/2004
Pages: 127