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Détail de l'auteur
Auteur Wang, Junmin
Documents disponibles écrits par cet auteur
Affiner la rechercheAdaptive and efficient ammonia storage distribution control for a two-catalyst selective catalytic reduction system / Ming-Feng Hsieh in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 1 (Janvier 2012)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 1 (Janvier 2012) . - 11 p.
Titre : Adaptive and efficient ammonia storage distribution control for a two-catalyst selective catalytic reduction system Type de document : texte imprimé Auteurs : Ming-Feng Hsieh, Auteur ; Wang, Junmin, Auteur Année de publication : 2012 Article en page(s) : 11 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Adaptive control Air pollution control Ammonia Chemical sensors Control system synthesis Diesel engines Storage Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : This paper presents an adaptive urea-SCR dosing control design for a two-catalyst SCR system. A novel SCR ammonia storage distribution control (ASDC) approach aiming to simultaneously increase the SCR NOx conversion efficiency and reduce the tailpipe ammonia slip was proposed and experimentally validated. Based on the insight into SCR operational principles, a high ammonia storage level at the upstream part of the catalyst can generally yield a higher NOx reduction efficiency while a low ammonia storage level at the downstream part of the catalyst can reduce the undesired tailpipe ammonia slip. To achieve such an ammonia storage distribution control, a two-catalyst (in series) SCR system with NOx and NH3 sensors was devised. Grounded in a newly developed SCR control-oriented model, an adaptive (with respect to the SCR ammonia storage capacity) controller was designed to control the urea injection rate for achieving different ammonia storages in the two catalysts. Experimental data from a US06 test cycle conducted on a medium-duty Diesel engine system showed that, with the similar total engine-out NOx emissions and NH3 (AdBlue) consumptions, the proposed ASDC strategy simultaneously reduced the tailpipe NOx emissions by 57% and the ammonia slip by 74% in comparison to those from a conventional controller. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000001 [...] [article] Adaptive and efficient ammonia storage distribution control for a two-catalyst selective catalytic reduction system [texte imprimé] / Ming-Feng Hsieh, Auteur ; Wang, Junmin, Auteur . - 2012 . - 11 p.
Dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 1 (Janvier 2012) . - 11 p.
Mots-clés : Adaptive control Air pollution control Ammonia Chemical sensors Control system synthesis Diesel engines Storage Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : This paper presents an adaptive urea-SCR dosing control design for a two-catalyst SCR system. A novel SCR ammonia storage distribution control (ASDC) approach aiming to simultaneously increase the SCR NOx conversion efficiency and reduce the tailpipe ammonia slip was proposed and experimentally validated. Based on the insight into SCR operational principles, a high ammonia storage level at the upstream part of the catalyst can generally yield a higher NOx reduction efficiency while a low ammonia storage level at the downstream part of the catalyst can reduce the undesired tailpipe ammonia slip. To achieve such an ammonia storage distribution control, a two-catalyst (in series) SCR system with NOx and NH3 sensors was devised. Grounded in a newly developed SCR control-oriented model, an adaptive (with respect to the SCR ammonia storage capacity) controller was designed to control the urea injection rate for achieving different ammonia storages in the two catalysts. Experimental data from a US06 test cycle conducted on a medium-duty Diesel engine system showed that, with the similar total engine-out NOx emissions and NH3 (AdBlue) consumptions, the proposed ASDC strategy simultaneously reduced the tailpipe NOx emissions by 57% and the ammonia slip by 74% in comparison to those from a conventional controller. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000001 [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 2 (Juin 2004) . - 265-275 p.
Titre : Friction Estimation on Highway Vehicles Using Longitudinal Measurements Titre original : Évaluation de Frottement sur des Véhicules de Route en Utilisant des Mesures Longitudinales Type de document : texte imprimé Auteurs : Wang, Junmin, Auteur ; Lee, Alexander, Auteur ; Rajamani, Rajesh Article en page(s) : 265-275 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Système en temps réel Frottement Modèle longitudinal non-linéaire Glissade Index. décimale : 629.8 Résumé : This paper develops a real-time tire-road friction coefficient measurement system that can reliably distinguish between different road surface friction levels and quickly detect abrupt changes in friction coefficient. The measurement system relies on the use of differential GPS and utilizes a nonlinear longitudinal tire force model. Compared to previously published results in literature, the advantage of the system developed in this paper is that it is applicable during both vehicle acceleration and braking and works reliably for a wide range of slip ratios, including high slip conditions. The system can be utilized on front/rear-wheel drive as well as all-wheel drive vehicles. Extensive results are presented from experimental results conducted on various surfaces with a winter maintenance vehicle called the "SAFEPLOW." The experimental results show that the system performs reliably and quickly in estimating friction coefficient on different road surfaces during various vehicle maneuvers. The developed friction measurement system has many applications in vehicle safety systems such as ABS, skid control and collision avoidance systems and is also useful for winter maintenance vehicles in which knowledge of the friction coefficient can be used to determine the amount and type of deicing chemicals to be applied to a winter roadway.
Cet article développe un système en temps réel de mesure de coefficient de frottement de route de pneu qui peut sûrement distinguer différents niveaux de frottement de couche de surface et rapidement détecter les changements brusques du coefficient de frottement. Le système de mesure se fonde sur l'utilisation du différentiel GPS et utilise un modèle longitudinal non-linéaire de force de pneu. Comparé aux résultats précédemment édités en littérature, l'avantage du système développé en cet article est que cela est applicable pendant l'accélération de véhicule et freiner et fonctionne sûrement pour un éventail de rapports de glissade, y compris la glissade élevée conditionne. Le système peut être utilisé sur la commande de roue de front/rear comme tous les véhicules d'entraînement de roue. Des résultats étendus sont présentés des résultats expérimentaux conduits sur de diverses surfaces avec un véhicule d'entretien d'hiver appelé l'"SAFEPLOW." Les résultats expérimentaux prouvent que le système exécute sûrement et rapidement en estimant le coefficient de frottement sur différentes couches de surface pendant de diverses manoeuvres de véhicule. Le système développé de mesure de frottement a beaucoup d'applications dans des systèmes de sûreté de véhicule tels que des systèmes d'ABS, de commande de dérapage et d'action d'éviter de collision et est également utile pour les véhicules d'entretien d'hiver en lesquels la connaissance du coefficient de frottement peut être employée pour déterminer la quantité et le type de produits chimiques de dégivrage à appliquer à une chaussée d'hiver.[article] Friction Estimation on Highway Vehicles Using Longitudinal Measurements = Évaluation de Frottement sur des Véhicules de Route en Utilisant des Mesures Longitudinales [texte imprimé] / Wang, Junmin, Auteur ; Lee, Alexander, Auteur ; Rajamani, Rajesh . - 265-275 p.
Génie Mécanique
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 2 (Juin 2004) . - 265-275 p.
Mots-clés : Système en temps réel Frottement Modèle longitudinal non-linéaire Glissade Index. décimale : 629.8 Résumé : This paper develops a real-time tire-road friction coefficient measurement system that can reliably distinguish between different road surface friction levels and quickly detect abrupt changes in friction coefficient. The measurement system relies on the use of differential GPS and utilizes a nonlinear longitudinal tire force model. Compared to previously published results in literature, the advantage of the system developed in this paper is that it is applicable during both vehicle acceleration and braking and works reliably for a wide range of slip ratios, including high slip conditions. The system can be utilized on front/rear-wheel drive as well as all-wheel drive vehicles. Extensive results are presented from experimental results conducted on various surfaces with a winter maintenance vehicle called the "SAFEPLOW." The experimental results show that the system performs reliably and quickly in estimating friction coefficient on different road surfaces during various vehicle maneuvers. The developed friction measurement system has many applications in vehicle safety systems such as ABS, skid control and collision avoidance systems and is also useful for winter maintenance vehicles in which knowledge of the friction coefficient can be used to determine the amount and type of deicing chemicals to be applied to a winter roadway.
Cet article développe un système en temps réel de mesure de coefficient de frottement de route de pneu qui peut sûrement distinguer différents niveaux de frottement de couche de surface et rapidement détecter les changements brusques du coefficient de frottement. Le système de mesure se fonde sur l'utilisation du différentiel GPS et utilise un modèle longitudinal non-linéaire de force de pneu. Comparé aux résultats précédemment édités en littérature, l'avantage du système développé en cet article est que cela est applicable pendant l'accélération de véhicule et freiner et fonctionne sûrement pour un éventail de rapports de glissade, y compris la glissade élevée conditionne. Le système peut être utilisé sur la commande de roue de front/rear comme tous les véhicules d'entraînement de roue. Des résultats étendus sont présentés des résultats expérimentaux conduits sur de diverses surfaces avec un véhicule d'entretien d'hiver appelé l'"SAFEPLOW." Les résultats expérimentaux prouvent que le système exécute sûrement et rapidement en estimant le coefficient de frottement sur différentes couches de surface pendant de diverses manoeuvres de véhicule. Le système développé de mesure de frottement a beaucoup d'applications dans des systèmes de sûreté de véhicule tels que des systèmes d'ABS, de commande de dérapage et d'action d'éviter de collision et est également utile pour les véhicules d'entretien d'hiver en lesquels la connaissance du coefficient de frottement peut être employée pour déterminer la quantité et le type de produits chimiques de dégivrage à appliquer à une chaussée d'hiver.
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 3 (Mai 2012) . - 10 p.
Titre : Oxygen concentration dynamic model and observer-based estimation through a diesel engine aftertreatment system Type de document : texte imprimé Auteurs : Pingen Chen, Auteur ; Wang, Junmin, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Oxygen concentration estimation Control-oriented modeling Diesel engine aftertreatment systems Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Due to the chemical reactions occurring inside the diesel oxidation catalysts (DOCs) and diesel particulate filters (DPFs) that are commonly equipped on diesel engines, the exhaust gas oxygen concentrations considerably vary through the aftertreatment systems. Oxygen concentration in exhaust gas is important for the performance of catalysts such as the NOx conversion efficiencies of the selective catalytic reduction systems and lean NOx traps. Moreover, in the presence of a low-pressure loop exhaust gas recirculation, the exhaust gas oxygen concentration after DPF also influences the in-cylinder combustion. From system control, estimation, and analysis viewpoints, it is thus imperative to have a control-oriented model to describe the oxygen concentration dynamics across the DOC and DPF. In this paper, a physics-based, lumped-parameter, control-oriented DOC–DPF oxygen concentration dynamic model was developed with a multi-objective optimization method and validated with the experimental data obtained on a medium-duty diesel engine equipped with a full suite of aftertreatment systems. Experimental results show that the model can well capture the oxygen dynamics across the diesel engine aftertreatment systems. As an application of the experimentally validated model, an observer was designed to estimate the DOC-out and DPF-out oxygen concentrations in real time. Experimental results show that the estimated states from the proposed observer can converge to the measured signals fastly and accurately. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000003 [...] [article] Oxygen concentration dynamic model and observer-based estimation through a diesel engine aftertreatment system [texte imprimé] / Pingen Chen, Auteur ; Wang, Junmin, Auteur . - 2012 . - 10 p.
Dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 3 (Mai 2012) . - 10 p.
Mots-clés : Oxygen concentration estimation Control-oriented modeling Diesel engine aftertreatment systems Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Due to the chemical reactions occurring inside the diesel oxidation catalysts (DOCs) and diesel particulate filters (DPFs) that are commonly equipped on diesel engines, the exhaust gas oxygen concentrations considerably vary through the aftertreatment systems. Oxygen concentration in exhaust gas is important for the performance of catalysts such as the NOx conversion efficiencies of the selective catalytic reduction systems and lean NOx traps. Moreover, in the presence of a low-pressure loop exhaust gas recirculation, the exhaust gas oxygen concentration after DPF also influences the in-cylinder combustion. From system control, estimation, and analysis viewpoints, it is thus imperative to have a control-oriented model to describe the oxygen concentration dynamics across the DOC and DPF. In this paper, a physics-based, lumped-parameter, control-oriented DOC–DPF oxygen concentration dynamic model was developed with a multi-objective optimization method and validated with the experimental data obtained on a medium-duty diesel engine equipped with a full suite of aftertreatment systems. Experimental results show that the model can well capture the oxygen dynamics across the diesel engine aftertreatment systems. As an application of the experimentally validated model, an observer was designed to estimate the DOC-out and DPF-out oxygen concentrations in real time. Experimental results show that the estimated states from the proposed observer can converge to the measured signals fastly and accurately. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000003 [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 4 (Juillet 2010) . - 13 p.
Titre : Two-level nonlinear model predictive control for lean NOx trap regenerations Type de document : texte imprimé Auteurs : Ming-Feng Hsieh, Auteur ; Wang, Junmin, Auteur ; Canova, Marcello, Auteur Année de publication : 2010 Article en page(s) : 13 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Diesel engines Nitrogen compounds Nonlinear control systems Predictive control Index. décimale : 629.8 Résumé : This paper describes a two-level nonlinear model predictive control (NMPC) scheme for diesel engine lean NOx trap (LNT) regeneration control. Based on the physical insights into the LNT operational characteristics, a two-level NMPC architecture with the higher-level for the regeneration timing control and the lower-level for the regeneration air to fuel ratio profile control is proposed. A physically based and experimentally validated nonlinear LNT dynamic model is employed to construct the NMPC control algorithms. The control objective is to minimize the fuel penalty induced by LNT regenerations while keeping the tailpipe NOx emissions below the regulations. Based on the physical insights into the LNT system dynamics, different choices of cost function were examined in terms of the impacts on fuel penalty and tailpipe NOx slip amount. The designed control system was evaluated on an experimentally validated vehicle simulator, cX-Emissions, with a 1.9 l diesel engine model through the FTP75 driving cycle. Compared with a conventional LNT control strategy, 31.9% of regeneration fuel penalty reduction was observed during a single regeneration. For the entire cold-start FTP75 test cycle, a 28.1% of tailpipe NOx reduction and 40.9% of fuel penalty reduction were achieved. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013 [...] [article] Two-level nonlinear model predictive control for lean NOx trap regenerations [texte imprimé] / Ming-Feng Hsieh, Auteur ; Wang, Junmin, Auteur ; Canova, Marcello, Auteur . - 2010 . - 13 p.
Systèmes dynamiques
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 4 (Juillet 2010) . - 13 p.
Mots-clés : Diesel engines Nitrogen compounds Nonlinear control systems Predictive control Index. décimale : 629.8 Résumé : This paper describes a two-level nonlinear model predictive control (NMPC) scheme for diesel engine lean NOx trap (LNT) regeneration control. Based on the physical insights into the LNT operational characteristics, a two-level NMPC architecture with the higher-level for the regeneration timing control and the lower-level for the regeneration air to fuel ratio profile control is proposed. A physically based and experimentally validated nonlinear LNT dynamic model is employed to construct the NMPC control algorithms. The control objective is to minimize the fuel penalty induced by LNT regenerations while keeping the tailpipe NOx emissions below the regulations. Based on the physical insights into the LNT system dynamics, different choices of cost function were examined in terms of the impacts on fuel penalty and tailpipe NOx slip amount. The designed control system was evaluated on an experimentally validated vehicle simulator, cX-Emissions, with a 1.9 l diesel engine model through the FTP75 driving cycle. Compared with a conventional LNT control strategy, 31.9% of regeneration fuel penalty reduction was observed during a single regeneration. For the entire cold-start FTP75 test cycle, a 28.1% of tailpipe NOx reduction and 40.9% of fuel penalty reduction were achieved. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013 [...]
