Calibration and Validation of a Diesel Oxidation Catalyst Model: from Synthetic Gas Testing to Driving Cycle Applications

Lafossas, Francois; Matsuda, Yoshifumi; Mohammadi, Ali; Morishima, Akinori; Inoue, Mizue; Kalogirou, Maria; Koltsakis, G. C.; Samaras, Zissis

doi:10.4271/2011-01-1244

Cited by 35 publications

(28 citation statements)

References 18 publications

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“…The self‐inhibition term is emphasized as being of relevance for the present hysteresis study, as will be shown later. The experimental evidence of the importance of this inhibition effect in the case of diesel oxidation catalysts has been highlighted in a previous work …”

Section: Theoretical Background and Modellingmentioning

confidence: 84%

Heat‐ and mass‐transfer induced hysteresis effects during catalyst light‐off testing

Koltsakis

2014

Can J Chem Eng

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The physical and chemical phenomena responsible for hysteresis effects met in lab testing of automotive catalysts under transient temperature conditions are investigated. The hysteresis, which is identified by the difference in light-off temperatures between temperature increase/decrease modes, could be important for model calibration purposes and revealing for some of the processes occurring within the reactor. With the help of mathematical modelling, we investigate the main parameters affecting the magnitude of the hysteresis and attempt to derive conclusions of practical relevance. We demonstrate that the hysteresis effect is closely linked to the active reaction zone length. The importance of internal species diffusion resistance in the washcoat, which is sometimes neglected for simplicity, is highlighted as an important factor in this context. On the basis of a sensitivity analysis, we identify the potential pitfalls that may occur during practical model calibration procedures on the basis of light-off tests.

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Section: Theoretical Background and Modellingmentioning

confidence: 84%

Heat‐ and mass‐transfer induced hysteresis effects during catalyst light‐off testing

Koltsakis

2014

Can J Chem Eng

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“…These curves, representing the HC adsorption as a function of the DOC temperature, have been derived from the available literature 7,8,10 and have shown general validity.…”

Section: Doc ''Catalyst'' Modelmentioning

confidence: 99%

Modeling of diesel oxidation catalysts for calibration and control purpose

Mallamo

Longhi

Millo

et al. 2013

International Journal of Engine Research

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An approach to the analysis of the performance of the diesel oxidation catalysts is presented in this article. A modeling methodology is proposed, whose main characteristics are the usage of a limited set of input data for the execution of the simulations, the minimal effort required for the preliminary calibration of the models and the reduced computational time. The developed diesel oxidation catalyst model structure is described, and its predictive capability is shown by means of a comparison with experimental measurements. The model is based on quasi-zero-dimensional and quasisteady-state approaches, which ensure a reasonable compromise between practicality of usage (including faster than real-time computational time) and quality of the results. Thanks to the quick execution and the accuracy of the results, the proposed modeling approach can be used not only for the development of the diesel powertrains but also for the optimization of the related control and calibration strategies. This process is particularly effective when the models for the aftertreatment systems are coupled with models for the prediction of the engine-out quantities and with software tools for the virtual calibration of the main engine and exhaust system control parameters. A specific example of the effectiveness of this kind of analysis is also given in this article, with focus on the assessment of the system robustness.

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“…The simplest kinetic models only describe the oxidation of CO, HC and NO (Voltz et al, 1973;Oh and Cavendish, 1982;Wang et al, 2008) (where HC is represented as one molecular species) but more detailed models with a more complex description of HC Lafossas et al, 2011) and other additional reactions (Ansell et al, 1996;Salomons et al, 2006;Pandya et al, 2009) have also been developed. The kinetic model used in this study is of Langmuir-Hinshelwood type and was originally suggested in the classical work by Voltz et al (1973) and later modified by Oh and Cavendish (1982).…”

Section: Reactor Modelmentioning

confidence: 99%

“…Generally, the kinetics are either described by a microkinetic model (Dumesic et al, 1993;Olsson et al, 2002;Crocoll et al, 2005;Salomons et al, 2006), where every reaction is described by elementary steps, or by more empirical global kinetic models (Voltz et al, 1973;Ansell et al, 1996;Lafossas et al, 2011;Watling et al, 2012). However, the catalyst model is not only defined by the kinetics but the influence of heat and mass transport must also be taken into account.…”

Section: Introductionmentioning

confidence: 98%