Model-based temperature control of a diesel oxidation catalyst

Lepreux, Olivier; Creff, Yann; Petit, Nicolas

doi:10.1016/j.jprocont.2011.10.012

Cited by 34 publications

(44 citation statements)

References 33 publications

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“…On the contrary, increasing CO concentration from 530 ppm to 5780 ppm and flow rate from 24 kg/hr to 93 kg/hr will decrease CO conversion efficiency from 50% to 25%. Trends from these experiments are found to be consistent to the literature found in [5], [7], and [12]. Results from above figures have shown that these 4 factors -exhaust temperature, exhaust flow rate, CO and O2 concentration affect CO conversion efficiency.…”

Section: Fractional Factorial Designsupporting

confidence: 87%

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Optimizing CO Reductions in a Diesel Oxidation Catalyst under Diesel Dual Fuel Exhaust Conditions

Suthiprasert¹,

Limpurimongkol²,

Jirawongnuson³

et al. 2017

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Abstract.A Diesel Dual Fuel (DDF) engine is an adapted diesel engine that uses natural gas and diesel fuel as the energy source at the same time. Natural gas is mixed with air at the intake manifold while diesel fuel is injected into the combustion chamber directly to initiate the combustion process. Based on the past DDF literatures, they are indicated that Carbon Monoxide (CO) emissions were more substantial at low load conditions than those when running in diesel engine modes. The Diesel Oxidation Catalyst (DOC) that is installed to this diesel engine is, therefore, not capable to reduce CO emissions abide by to the emission regulation. Literatures also indicate that the exhaust temperature, mass flow rate, Oxygen (O2) concentration, CO concentration, as well as Propane (C3H8) concentration may affect CO conversion efficiency of the catalytic converter. In the present work, Design of Experiments (DOE) is employed to explore the behavior of various factors that affect CO reductions in the catalytic converter. Once the knowledge is founded, the optimization of CO reductions in the catalytic converter at 90% is studied extensively.Using Fractional Factorial Design for screening factors on CO conversions, it is found that the exhaust temperature, mass flow rate, O2 concentration, and CO concentration affect CO conversions of the catalytic converter significantly. Optimization of these factors, by using Box-Behnken Design, for reducing CO concentration of 6200 ppm which is the maximum CO amount emitted from the tested engine shows that 90% of CO conversion can be reached at the exhaust temperature of 200 0 C, the mass flow rate of 25 kg/h, and the oxygen concentration of 16%.

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Section: Fractional Factorial Designsupporting

confidence: 87%

“…High O2 concentration will increase the efficiency, while high CO concentration will decrease the efficiency [6]. At higher exhaust temperature, pre-CAT temperature, CO will decrease with better efficiency [7]. And lastly, the exhaust flow rate in which lower flow rate leads better efficiency.…”

Section: Introductionmentioning

confidence: 99%

Optimizing CO Reductions in a Diesel Oxidation Catalyst under Diesel Dual Fuel Exhaust Conditions

Suthiprasert¹,

Limpurimongkol²,

Jirawongnuson³

et al. 2017

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“…Following along a study in [14], it can be verified that the reduced model is equivalent, at constant speed v(t) = v and at order 0 in ε = v/k 1 , with…”

Section: Appendix A: Explanation Of Overshoot On a Simple Model A Simmentioning

confidence: 87%

“…This model, actually deduced from the reduced model [14], allows to describe the overshoot phenomena in its simplest form. The analytical study of this model gives the formal expression of the output response to a step change in L c (t), for an arbitrary trajectory, related to the actual control and forced to be uniform over the length L c (t).…”

Section: Compensation Of Overshoot Phenomenonmentioning

confidence: 99%

Practical Achievable Performance in Diesel Oxidation Catalyst Temperature Control

Lepreux

Creff

Petit

2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Performances atteignables en pratique pour la commande de la température d'un catalyseur d'oxydation Diesel -Ce papier propose un modèle simplifié pour la commande d'un catalyseur d'oxydation Diesel (DOC). Ce modèle à paramètres répartis prend en compte la génération de chaleur spatialement répartie liée à l'oxydation des réducteurs. Il vise à être utilisé pour la commande de la température en sortie du DOC. Cette commande est nécessaire lors des phases de régénération du filtre à particules (DPF). Le papier s'intéresse en particulier aux phénomènes impliqués par les variations de débit de gaz dans le DOC. Ces variations ont lieu pendant les changements de points de fonctionnement du moteur liés à la demande du conducteur : elles sont importantes et fréquentes et ne peuvent pas être évitées. Les résultats expérimentaux présentés dans ce papier montrent qu'une augmentation du débit de gaz -à concentration HC constante en entrée du DOC -a tendance à créer un dépassement positif de la température en sortie du DOC. Au contraire, une diminution du débit a tendance à créer un dépassement négatif de la température en sortie du DOC. L'utilisation d'une mesure de température au milieu du pain catalytique permet de montrer que ces perturbations sont inhérentes à la nature répartie du système. La compensation de ces variations de température en sortie est physiquement limitée (par les limites d'actionnement et d'utilisation raisonnable du système), ce qui crée une perturbation retardée de la température en sortie du DOC. En conséquence, il semble qu'il existe une limite pratique pour les performances de commande de la température en sortie du DOC, qui sont, pour le DOC présenté (4 pouces de long et 1,65 L de volume), d'environ +/-15 • C autour de la température de sortie souhaitée. Le modèle proposé, sa validation expérimentale, ainsi que les analyses des performances obtenues sur un banc d'essai constituent les contributions principales de cet article. Abstract -Practical Achievable Performance in Diesel Oxidation Catalyst Temperature ControlThis paper proposes a simple control-oriented model for a Diesel Oxidation Catalyst (DOC

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“…In this paper, following the overture presented in [12], we propose to represent the chemical reactions inside the catalyst as a temperature entering the system at a virtual entry point located downstream of the physical inlet of the monolith. To make this approach compliant with SI engines applications, it is proposed here to use the catalyst efficiency conversion to calculate the gain relating the heat release to the fictitious temperature.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the distributed temperature of a SI engine catalyst for light-off strategy

Bresch‐Pietri

Leroy

Petit

2013

2013 European Control Conference (ECC)

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Model-based temperature control of a diesel oxidation catalyst

Cited by 34 publications

References 33 publications

Optimizing CO Reductions in a Diesel Oxidation Catalyst under Diesel Dual Fuel Exhaust Conditions

Optimizing CO Reductions in a Diesel Oxidation Catalyst under Diesel Dual Fuel Exhaust Conditions

Practical Achievable Performance in Diesel Oxidation Catalyst Temperature Control

Estimation of the distributed temperature of a SI engine catalyst for light-off strategy

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