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Mean value modeling and analysis of HCCI diesel engines with external mixture formation / Canova, Marcello in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 131 N°1 (Janvier/Février 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 131 N°1 (Janvier/Février 2009) . - 14 p. Titre : Mean value modeling and analysis of HCCI diesel engines with external mixture formation Type de document : texte imprimé Auteurs : Canova, Marcello, Auteur ; Midlam-Mohler, Shawn, Auteur ; Yann Guezennec, Auteur Année de publication : 2009 Article en page(s) : 14 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : pressure;  flow  (dynamics);  temperature;  combustion;  fuels;  engines;  stress;  cylinders;  diesel  engines;  exhaust  systems;  mixtures;  exhaust  gas  recirculation;  homogeneous  charge  compression  ignition  engines Résumé : Homogeneous charge compression ignition (HCCI) is a promising concept for internal combustion engines that can considerably decrease NOx and soot emissions in part-load operations without penalizing fuel consumption. The HCCI combustion can be implemented in direct injection diesel engines without major modifications by introducing a specialized fuel injector in the intake port. This decouples the homogeneous mixture formation from the traditional in-cylinder injection, thus providing two fueling systems that can be used to optimize exhaust emissions and fuel consumption over the engine operating range. However, understanding and controlling the complex mechanisms and interactions driving the HCCI combustion process is still a difficult task. For this reason, it is essential to identify the most important control parameters and understand their influence on the auto-ignition process. The current work analyzes HCCI combustion with external mixture formation through experimental investigation and the definition of a control-oriented model. An extensive testing activity was performed on a passenger car diesel engine equipped with an external fuel atomizer to operate in HCCI mode. This provided an understanding of the process as well as experimental data to identify a mean value model of the system and its parameters. The model includes a thermodynamic combustion calculation that estimates the heat release, cylinder pressure, and the relevant variables for combustion control. The tool developed was then validated and used for analyzing the system behavior in steady state conditions. Finally, a description of the HCCI system behavior in transient operations is presented. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Mean value modeling and analysis of HCCI diesel engines with external mixture formation [texte imprimé] / Canova, Marcello, Auteur ; Midlam-Mohler, Shawn, Auteur ; Yann Guezennec, Auteur . - 2009 . - 14 p. dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 131 N°1 (Janvier/Février 2009) . - 14 p. Mots-clés : pressure;  flow  (dynamics);  temperature;  combustion;  fuels;  engines;  stress;  cylinders;  diesel  engines;  exhaust  systems;  mixtures;  exhaust  gas  recirculation;  homogeneous  charge  compression  ignition  engines Résumé : Homogeneous charge compression ignition (HCCI) is a promising concept for internal combustion engines that can considerably decrease NOx and soot emissions in part-load operations without penalizing fuel consumption. The HCCI combustion can be implemented in direct injection diesel engines without major modifications by introducing a specialized fuel injector in the intake port. This decouples the homogeneous mixture formation from the traditional in-cylinder injection, thus providing two fueling systems that can be used to optimize exhaust emissions and fuel consumption over the engine operating range. However, understanding and controlling the complex mechanisms and interactions driving the HCCI combustion process is still a difficult task. For this reason, it is essential to identify the most important control parameters and understand their influence on the auto-ignition process. The current work analyzes HCCI combustion with external mixture formation through experimental investigation and the definition of a control-oriented model. An extensive testing activity was performed on a passenger car diesel engine equipped with an external fuel atomizer to operate in HCCI mode. This provided an understanding of the process as well as experimental data to identify a mean value model of the system and its parameters. The model includes a thermodynamic combustion calculation that estimates the heat release, cylinder pressure, and the relevant variables for combustion control. The tool developed was then validated and used for analyzing the system behavior in steady state conditions. Finally, a description of the HCCI system behavior in transient operations is presented. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]

A model based estimator for cylinder specific air-to-fuel ratio corrections / Meyer, Jason A. in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 133 N° 3 (Mai 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 3 (Mai 2011) . - 14 p. Titre : A model based estimator for cylinder specific air-to-fuel ratio corrections Type de document : texte imprimé Auteurs : Meyer, Jason A., Auteur ; Yurkovich, Stephen, Auteur ; Midlam-Mohler, Shawn, Auteur Année de publication : 2011 Article en page(s) : 14 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Closed  loop  systems  Engines  Exhaust  systems  Feedback  Feedforward  FIR  filters  Fuel  systems  Mechanical  variables  control  Open  loop  systems Index. décimale : 629.8 Résumé : One of the most overlooked and oversimplified components of an engine model used for model based air-to-fuel ratio (AFR) control and/or diagnostics is the exhaust gas dynamics model. Without a proper model of the exhaust system, the mixing of exhaust gases and the dynamic transport delays are challenging to capture accurately, even with a meticulous experimental calibration. By representing the exhaust system with a finite impulse response (FIR) model whose coefficients are based on physical properties, these effects can be predicted accurately and smoothly across the complete range of operating conditions. Through on-line and off-line techniques, this model can markedly improve the performance of both open loop and closed loop AFR control. Because a FIR model has a linear relationship between the input and the output, the input error trajectory can be identified from a single precatalyst oxygen sensor measurement. This technique can be used to supplement the calibration of either the feed-forward or feedback portion of the AFR controller. Additionally, the FIR model can be used for on-line estimation of cylinder imbalance errors. This model based approach to cylinder imbalance estimation has several advantages over the current empirically based methods including robustness and ease of calibration. DEWEY : 629.8 ISSN : 0022.0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013300 [...] [article] A model based estimator for cylinder specific air-to-fuel ratio corrections [texte imprimé] / Meyer, Jason A., Auteur ; Yurkovich, Stephen, Auteur ; Midlam-Mohler, Shawn, Auteur . - 2011 . - 14 p. Systèmes dynamiques Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 3 (Mai 2011) . - 14 p. Mots-clés : Closed  loop  systems  Engines  Exhaust  systems  Feedback  Feedforward  FIR  filters  Fuel  systems  Mechanical  variables  control  Open  loop  systems Index. décimale : 629.8 Résumé : One of the most overlooked and oversimplified components of an engine model used for model based air-to-fuel ratio (AFR) control and/or diagnostics is the exhaust gas dynamics model. Without a proper model of the exhaust system, the mixing of exhaust gases and the dynamic transport delays are challenging to capture accurately, even with a meticulous experimental calibration. By representing the exhaust system with a finite impulse response (FIR) model whose coefficients are based on physical properties, these effects can be predicted accurately and smoothly across the complete range of operating conditions. Through on-line and off-line techniques, this model can markedly improve the performance of both open loop and closed loop AFR control. Because a FIR model has a linear relationship between the input and the output, the input error trajectory can be identified from a single precatalyst oxygen sensor measurement. This technique can be used to supplement the calibration of either the feed-forward or feedback portion of the AFR controller. Additionally, the FIR model can be used for on-line estimation of cylinder imbalance errors. This model based approach to cylinder imbalance estimation has several advantages over the current empirically based methods including robustness and ease of calibration. DEWEY : 629.8 ISSN : 0022.0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013300 [...]