Modelling of selective catalytic reduction systems using discrete-time Linear Parameter Varying models

• In this work, a Linear Parameter Varying (LPV) model of the Selective CatalyticReduction (SCR) system, used for NOxreduction placed as after-treatment systems in dieselengines is developed. The LPV model structure is formed utilising the physical properties of thesystem yielding only 7 unknown parameters for a third order model structure of the SCR, whichis a significant reduction in number of parameters in comparison with other nonlinear modelsused in this paper. The states of the model however, do not possess any physical interpretation.The LPV model structure is validated using real measured data from cell tests at Scania ABwith promising results. The proposed model is compared to previous global nonlinear models ofthe system, i.e. a nonlinear state space model and a Hammerstein-Wiener model of the system.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)

Nyckelord

Linear parameter varying systems

non-linear systems

selective catalytic reduction systems

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kon (ämneskategori)

ref (ämneskategori)