Practical Achievable Performance in Diesel Oxidation Catalyst Temperature Control

Abstract : This paper proposes a simple control-oriented model for a Diesel Oxidation Catalyst (DOC). This distributed parameter model accounts for spatially distributed heat generation due to oxidation of reductants. It aims at being used in the context of DOC outlet temperature control, which is required during Diesel Particulate Filter (DPF) active regeneration process. The paper focuses particularly on phenomena involved during variations of gas flow rate through the DOC. These variations take place during changes of engine operating points due to driver’s requests: they are large and frequent, and cannot be avoided. Experimental results presented in this paper show that an increase in the gas flow rate, at constant inlet HC concentration, tends to make DOC outlet temperature overshoot. On the contrary, a decrease in the gas flow rate tends to make DOC outlet temperature undershoot. Using an intra-catalyst measurement, it is shown that these disturbances are related to the inherent distributed nature of the system. Compensating for observed outlet temperature variations is physically limited (by actuation limits and reasonable use of the system) and creates a delayed DOC outlet temperature disturbance. As a consequence, it seems that there exists a practical limit for the DOC outlet temperature control performance, which is, for the presented 4-inch long (1.65-L) DOC, approximately  ±15°C around the desired outlet temperature. The proposed simple model, its experimental validation, and the obtained analysis of performance based on testbench results are the main contributions of the article.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-00643456
Contributeur : François Chaplais <>
Soumis le : mercredi 28 novembre 2018 - 10:21:01
Dernière modification le : jeudi 7 février 2019 - 16:29:44

Fichier

ogst110015.pdf
Publication financée par une institution

Identifiants

Citation

Olivier Lepreux, Yann Creff, Nicolas Petit. Practical Achievable Performance in Diesel Oxidation Catalyst Temperature Control. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2011, 66 (4), pp.693-704. ⟨10.2516/ogst/2011115⟩. ⟨hal-00643456⟩

Partager

Métriques

Consultations de la notice

211

Téléchargements de fichiers

128