A New Approximation of the Storage Efficiency for the Lean NOx Trap Model

Lee, B.; Grepl, R.; Han, Manbae

doi:10.1007/978-3-319-02294-9_14

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“…For the precise control of the LNT regeneration, a control oriented LNT model should be developed by estimating the stored NO x amount or the NO x storage fraction in the catalyst (Canova et al, 2010;Larsson et al, 1999;Midlam-Mohler, 2005;Nauta, 2010;Kim et al, 2003;Sun et al, 2004;Lee et al, 2013;Lee and Han, 2014). The control oriented LNT model would let the ECU (Engine Control Unit) designer determine when the regeneration of the catalyst should be initiated and ended to satisfy both minimal fuel consumption and higher NO x conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Control oriented model of a lean NOx trap for the catalyst regeneration in a 2.2 L direct injection diesel engine

Han

Lee

2015

Int.J Automot. Technol.

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In this study a control oriented lean NO x trap (LNT) model was successfully developed for the LNT regeneration purpose to estimate the NO x storage fraction, NO x concentration out of an LNT catalyst and an LNT catalyst bed temperature. The LNT model consists of storage, reduction and 0-D catalyst bed temperature submodel. The model parameters were estimated by the least square fit method in the environment of MATLAB and Simulink. This model was validated through transient engine data to simulate the NEDC mode. The NO x storage fraction in the LNT catalyst can be used as a mean of the determination of the LNT regeneration timing and duration control. The catalyst bed temperature model monitors the thermal behavior. The LNT model was validated by the NEDC mode data shows less than 7% error of cumulated NO x out amount during the storage phase. In addition the catalyst bed temperature model exhibits quite similarly to the experimental data. Therefore the LNT model developed in this study can be applied to the vehicle application as an LNT regeneration control.

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