Abstract
AbstractThis paper presents the application of higher order Sliding Mode observers (SMO) for state observation and friction estimation of an engine air path actuator. The actuator model incorporates LuGre Friction Model for dynamic friction modeling. The study has two objectives, to observe the system dynamics and the friction dynamics, and to use the equivalent output injection to estimate the parameters of the LuGre model. Cascaded sliding mode observers have been used to observe system and friction dynamics separately. Friction force has been estimated using the Equivalent output injection of the observer, considering friction as an unknown external input. Through this estimation, identification of the LuGre model parameters becomes simplified. Simulation and experimental results show the effectiveness of the proposed observation and identification scheme.
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