Publications


Battery Modeling and Control

[16] Xinfan Lin, Hector E. Perez, Jason B. Siegel, Anna G. Stefanopoulou, Yonghua Li, R. Dyche Anderson, Yi Ding, and Matthew P. Castanier. Online parameterization of lumped thermal dynamics in cylindrical lithium ion batteries for core temperature estimation and health monitoring. IEEE Transactions on Control System Technology, Accepted pending minor revisions, 2013. [ bib | pdf ]
[15] Xinfan Lin, Anna G. Stefanopoulou, Hector E. Perez, Jason B. Siegel, Yonghua Li, and R. Dyche Anderson. Quadruple adaptive observer of the core temperature in cylindrical li-ion batteries and their health monitoring. In 2012 American Control Conference (ACC), June 27 - 29 2012, 2012. [ bib | pdf | presentation file ]
[14] Hector E Perez, Jason B Siegel, Xinfan Lin, Yi Ding, and Matthew P Castanier. Parameterization and validation of an integrated electro-thermal lfp battery model. In 2012 ASME Dynamic Systems Control Conference, Oct 2012, 2012. [ bib | pdf | presentation excerpts ]
[13] Jason B. Siegel, Xinfan Lin, and Anna G. Stefanopoulou. On the accuracy and simplifications of battery models using in situ measurements of lithium concentration in operational cells. In in Proceedings of the 2012 American Control Conference, 2012, 2012. [ bib | pdf ]
[12] Anna Stefanopoulou. Neutron imaging for li-ion batteries. 18th Annual Automotive Reseaerch Center Conference, 2012. [ bib | pdf ]
[11] Xinfan Lin, Hector E. Perez, Jason B. Siegel, Anna G. Stefanopoulou, Yi Ding, and Matthew P. Castanier. Parameterization and observability analysis of scalable battery clusters for onboard thermal management. In Les Rencontres Scientifiques d’IFP Energies nouvelles – Int. Scient. Conf. on hybrid and electric vehicles – RHEVE 2011 6-7 December 2011 - Proceedings, 2011. [ bib | http ]
[10] Xinfan Lin, Anna Stefanopoulou, Patricia Laskowsky, Jim Freudenberg, Yonghua Li, and R. Dyche Anderson. State of charge estimation error due to parameter mismatch in a generalized explicit lithium ion battery model. ASME Conference Proceedings, 2011(54754):393-400, 2011. [ bib | DOI | http ]
[9] Jason B. Siegel, Xinfan Lin, Anna G. Stefanopoulou, Daniel S. Hussey, David L. Jacobson, and David Gorsich. Neutron imaging of lithium concentration in lfp pouch cell battery. Journal of The Electrochemical Society, 158(5):A523-A529, 2011. [ bib | DOI | http ]
[8] C. Speltion, A. G. Stefanopoulou, and G. Fiengo. Parameterization and estimation of surrogate critical surface concentration in lithium-ion batteries. In Special Issue on Int’l Journal of Vehicle Dynamics, 01 MAR 2011, 2011. [ bib | http ]
[7] Domenico Di Domenico, Anna Stefanopoulou, and Giovanni Fiengo. Lithium-ion battery state of charge and critical surface charge estimation using an electrochemical model-based extended kalman filter. Journal of Dynamic Systems, Measurement, and Control, 132(6):061302, 2010. [ bib | DOI | http ]
[6] S.J. Moura, J.B. Siegel, D.J. Siegel, H.K. Fathy, and A.G. Stefanopoulou. Education on vehicle electrification: Battery systems, fuel cells, and hydrogen. In Vehicle Power and Propulsion Conference (VPPC), 2010 IEEE, pages 1 -6, sept. 2010. [ bib | DOI ]
[5] Carmelo Speltino, Domenico Di Domenico, Giovanni Fiengo, and Anna G. Stefanopoulou. Cell equalization in battery stacks through state of charge estimation polling. In American Control Conference, 2010. [ bib | pdf ]
[4] Carmelo Speltino, Domenico Di Domenico, Giovanni Fiengo, and Anna G. Stefanopoulou. Comparison of reduced order lithium-ion battery models for control applications. In Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference, October 2009. [ bib | pdf ]
[3] Carmelo Speltino, Domenico Di Domenico, Giovanni Fiengo, and Anna G. Stefanopoulou. Experimental validation of a lithium-ion battery state of charge estimation with an extended kalman filter: Part i. In The European Control Conference, 2009. [ bib | pdf ]
[2] Carmelo Speltino, Domenico Di Domenico, Giovanni Fiengo, and Anna G. Stefanopoulou. On the experimental identification of an electrochemical model of a lithium-ion battery: Part ii. In The European Control Conference, 2009. [ bib | pdf ]
[1] D. Domenico, G. Di Fiengo, and A. Stefanopoulou. Lithium-ion battery state of charge estimation with a kalman filter based on a electrochemical model. In Proc. IEEE International Conference on Control Applications CCA, pages 702-707, Sep 2008. [ bib | DOI | pdf ]

Fuel Cells:

Please visit the laboratory website for downloadable fuel cell models and data including in-situ neutron imaging.

Fuel Cell Water Management

[41] J. Chen, J.B. Siegel, A.G. Stefanopoulou, and J.R. Waldecker. Optimization of purge cycle for dead-ended anode fuel cell operation. International Journal of Hydrogen Energy, 38:5092-5105, 2013. [ bib | DOI | .pdf ]
[40] T. Matsuura, J. Chen, J.B. Siegel, and A.G. Stefanopoulou. Degradation phenomena in pem fuel cell with dead-ended anode. International Journal of Hydrogen Energy, 38:11346-11356, 2013. [ bib | DOI | .pdf ]
[39] Jixin Chen, Jason B. Siegel, and Anna G. Stefanopoulou. Optimization of purging cycle for dead-ended anode fuel cell operation. In Proceedings of the 10th Fuel Cell Science, Engineering and Technology Conference, number ESFuelCell2012-91307, San Diego, California, July 2012. [ bib | .pdf ]
[38] Toyoaki Marsuura, Jason B. Siegel, and Anna G. Stefanopoulou. Experimental investigation of degradation in pemfc with dead-ended anode operation. In ECS Meeting Abstracts, volume 1201, page 315, Seattle, Washington, May 2012. ECS. [ bib | .pdf ]
[37] Serhat Yesilyurt, Jason B. Siegel, and Anna G. Stefanopoulou. Modeling and experiments of voltage transients of polymer electrolyte membrane fuel cells with the Dead-Ended anode. Journal of Fuel Cell Science and Technology, 9(2):021012, April 2012. [ bib | DOI | .pdf ]
[36] Jixin Chen, Jason B. Siegel, and Anna G. Stefanopoulou. Nitrogen blanketing front equilibria in dead end anode fuel cell operation. In Proceedings of the 2011 American Control Conference, pages 1524 - 1529, San Francisco, CA, US, June 2011. [ bib | .pdf ]
[35] Jixin Chen, Jason B. Siegel, Toyoaki Matsuura, and Anna G. Stefanopoulou. Carbon corrosion in pem fuel cell dead-ended anode operations. J. Electrochem. Soc., 158(9):B1164-B1174, 2011. [ bib | DOI | .pdf ]
[34] Toyoaki Matsuura, Jason B. Siegel, Anna G. Stefanopoulou, and Jixin Chen. Multiple degradation phenomena in polymer electrolyte membrane fuel cell with dead-ended anode. In Proceedings of the 9th Fuel Cell Science, Engineering and Technology Conference, number ESFuelCell2011-54344, Washington DC, 2011. ASME. [ bib | DOI | .pdf ]
[33] Denise A. McKay, Anna G. Stefanopoulou, and Jeffrey Cook. A controllable membrane-type humidifier for fuel cell applications-part ii: Controller design, analysis and implementation. Journal of Fuel Cell Science and Technology, 8(1):011004, 2011. [ bib | DOI | http ]
[32] Jason B. Siegel, Anna G. Stefanopoulou, and Serhat Yesilyurt. Modeling and experiments of voltage transients of pem fuel cells with the dead-ended anode. In Proceedings of the 9th Fuel Cell Science, Engineering and Technology Conference, number ESFuelCell2011-54768, Washington DC, 2011. ASME. [ bib | .pdf ]
[31] Jason B. Siegel, Anna G. Stefanopoulou, and Serhat Yesilyurt. Modeling and simulations of pemfcs operating with periodically purged dead-ended anode channels. In Proc. of the 8th International Fuel Cell Science, Engineering and Technology Conference, number FuelCell2010-33341, Brooklyn, New York, USA, June 14-16 2010. [ bib | .pdf ]
[30] Giulio Ripaccioli Jason B. Siegel, Anna G. Stefanopoulou and Stefano Di Cairano. The Control Handbook, Second Edition: Control System Applications, chapter 5. Purge Scheduling for Dead-Ended Anode Operation of PEM Fuel Cells, pages 5-1 - 5-43. CRC Press, second edition, 2010. [ bib ]
[29] Buz A. McCain, Anna G. Stefanopoulou, and Jason B. Siegel. Controllability and observability analysis of the liquid water distribution inside the gas diffusion layer of a unit fuel cell model. Journal of Dynamic Systems, Measurement, and Control, 132(6):061303, 2010. [ bib | DOI | http ]
[28] Eric A. Muller, Florian Kolb, Lino Guzzella, Anna G. Stefanopoulou, and Denise A. McKay. Correlating nitrogen accumulation with temporal fuel cell performance. Journal of Fuel Cell Science and Technology, 7(2):021013, 2010. [ bib | DOI | http ]
[27] Jason B. Siegel, Stanislav V. Bohac, Anna G. Stefanopoulou, and Serhat Yesilyurt. Nitrogen front evolution in purged polymer electrolyte membrane fuel cell with dead-ended anode. J. Electrochem. Soc., 157(7):B1081-B1093, 2010. [ bib | DOI | .pdf ]
[26] Jason B. Siegel and Anna G. Stefanopoulou. Reduced complexity models for water management and anode purge scheduling in dea operation of pemfc. In ECS Meeting Abstracts, volume 1002, pages 766-766. ECS, 2010. [ bib | .pdf ]
[25] Jason B. Siegel and Anna G. Stefanopoulou. Parameterization of gdl liquid water front propagation and channel accumulation for anode purge scheduling in fuel cells. In Proc. of the 2010 American Control Conference, 2010. [ bib | .pdf ]
[24] Giulio Ripaccioli, Jason B. Siegel, Anna G. Stefanopoulou, and Stefano Di Cairano. Derivation and simulation results of a hybrid model predictive control for water purge scheduling in a fuel cell. In Proc. of the 2nd Annual Dynamic Systems and Control Conference, Hollywood, CA, USA, October 12-14 2009. [ bib | .pdf ]
[23] J. B. Siegel and A. G. Stefanopoulou. Through the membrane & along the channel flooding in PEMFCs. In Proc. of the 2009 American Control Conference, pages 2666-2671, June 2009. [ bib | DOI | .pdf ]
[22] A. Y. Karnik, J. Sun, A. G. Stefanopoulou, and J. H. Buckland. Humidity and pressure regulation in a pem fuel cell using a gain-scheduled static feedback controller. IEEE Transactions on Control Systems Technology, 17(2):283-297, March 2009. [ bib | DOI ]
[21] Jason B. Siegel, Serhat Yesilyurt, and Anna G. Stefanopoulou. Extracting model parameters and paradigms from neutron imaging of dead-ended anode operation. In Proc. of the 7th International Fuel Cell Science, Engineering and Technology Conference, 2009. [ bib | .pdf ]
[20] A.G. Stefanopoulou, I.V. Kolmanovsky, and B.A. McCain. A dynamic semi-analytic channel-to-channel model of two-phase water distribution for a unit fuel cell. Control Systems Technology, IEEE Transactions on, 17(5):1055-1068, Sept. 2009. [ bib | DOI ]
[19] Serhat Yesilyurt, Jason Siegel, and Anna Stefanopoulou. Effects of nitrogen and water accumulation in the dead-ended-anode operation of pem fuel cells. In ECS Meeting Abstracts, volume 901, pages 359-359, 2009. [ bib | .pdf ]
[18] J. B. Siegel, D. A. McKay, and A. G. Stefanopoulou. Modeling and validation of fuel cell water dynamics using neutron imaging. In Proc. of the 2008 American Control Conference, pages 2573-2578, June 2008. [ bib | DOI | .pdf ]
[17] B. A. McCain, J. B. Siegel, and A. G. Stefanopoulou. Stack-level validation of a semi-analytic channel-to-channel fuel cell model for two-phase water distribution boundary value control. In Proc. American Control Conference, pages 5098-5103, 11-13 June 2008. [ bib | DOI ]
[16] Buz A. McCain, Anna G. Stefanopoulou, and Kenneth R. Butts. On controllability and observability of linearized liquid water distributions inside a pem fuel cell. volume 2008, pages 385-392. ASME, 2008. [ bib | DOI | http ]
[15] B. A. McCain, A. G. Stefanopoulou, and I. V. Kolmanovsky. Stability analysis for liquid water accumulation in low temperature fuel cells. In Proc. 47th IEEE Conference on Decision and Control CDC 2008, pages 859-864, 9-11 Dec. 2008. [ bib | DOI ]
[14] Buz A. McCain, Anna G. Stefanopoulou, and Ilya V. Kolmanovsky. On the dynamics and control of through-plane water distributions in pem fuel cells. Chemical Engineering Science, 63(17):4418 - 4432, 2008. [ bib | DOI | http ]
[13] Denise A. McKay, Jason B. Siegel, William Ott, and Anna G. Stefanopoulou. Parameterization and prediction of temporal fuel cell voltage behavior during flooding and drying conditions. Journal of Power Sources, 178(1):207 - 222, 2008. [ bib | DOI | pdf | http ]
[12] D. A. McKay, A. G. Stefanopoulou, and J. Cook. Model and experimental validation of a controllable membrane-type humidifier for fuel cell applications. In Proc. American Control Conference, pages 312-317, 11-13 June 2008. [ bib | DOI ]
[11] Denise A. McKay, Anna G. Stefanopoulou, and Jeffrey Cook. A membrane-type humidifier for fuel cell applications: Controller design, analysis and implementation. volume 2008, pages 841-850. ASME, 2008. [ bib | DOI | http ]
[10] Eric A. Muller, Florian Kolb, Lino Guzzella, Denise A. McKay, and Anna G. Stefanopoulou. Correlating nitrogen accumulation with temporal fuel cell performance. volume 2008, pages 393-401. ASME, 2008. [ bib | DOI | http ]
[9] Jason B. Siegel, Denise A. McKay, Anna G. Stefanopoulou, Daniel S. Hussey, and David L. Jacobson. Measurement of liquid water accumulation in a pemfc with dead-ended anode. Journal of The Electrochemical Society, 155(11):B1168-B1178, 2008. [ bib | DOI | pdf ]
[8] Jason B. Siegel, Denise McKay, and Anna Stefanopoulou. Measurement of liquid water accumulation in a proton exchange membrane fuel cell with dead-ended anode. In Proc. of the 6th International Fuel Cell Science Engineering and Technology, 2008. FuelCell2008-65053. [ bib | .pdf ]
[7] Amey Y. Karnik, Anna G. Stefanopoulou, and Jing Sun. Water equilibria and management using a two-volume model of a polymer electrolyte fuel cell. Journal of Power Sources, 164(2):590 - 605, 2007. [ bib | DOI | http ]
[6] B. A. McCain, A. G. Stefanopoulou, and I. V. Kolmanovsky. A multi-component spatially-distributed model of two-phase flow for estimation and control of fuel cell water dynamics. In Proc. 46th IEEE Conference on Decision and Control, pages 584-589, 12-14 Dec. 2007. [ bib | DOI ]
[5] B. A. McCain and A. G. Stefanopoulou. Order reduction for a control-oriented model of the water dynamics in fuel cells. In Proc 4th International Conf on Fuel Cell Science, Engr and Technology. FUELCELL2006-97075., 2006. [ bib | pdf ]
[4] B. A. McCain and A. G. Stefanopoulou. Order reduction for a control-oriented model of the water dynamics in fuel cells. volume 2006, pages 151-159. ASME, 2006. [ bib | DOI | http ]
[3] B. A. McCain, A. G. Stefanopoulou, and K. R. Butts. A study towards minimum spatial discretization of a fuel cell dynamics model. In Proc 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006-14509, 2006. [ bib | pdf ]
[2] D. A. McKay, W. T. Ott, and A. G. Stefanopoulou. Modeling, parameter identification, and validation of reactant and water dynamics for a fuel cell stack. In Proceedings of 2005 ASME International Mechanical Engineering Congress & Exposition, volume 2005, pages 1177-1186. ASME, Nov 2005. [ bib | DOI | pdf | http ]
[1] D. McKay and A. Stefanopoulou. Parameterization and validation of a lumped parameter diffusion model for fuel cell stack membrane humidity estimation. In Proc. American Control Conference the 2004, volume 1, pages 816-821, June 2004. [ bib | pdf ]

Fuel Cell Reactant Flow Control
[14] A. Ingimundarson, A. Stefanopoulou, and D. A. McKay. Model-based detection of hydrogen leaks in a fuel cell stack. IEEE Transactions on Control Systems Technology, 16(5):1004-1012, Sept. 2008. [ bib | DOI ]
[13] Kyung-Won Suh and A. G. Stefanopoulou. Performance limitations of air flow control in power-autonomous fuel cell systems. IEEE Transactions on Control Systems Technology, 15(3):465-473, May 2007. [ bib | DOI ]
[12] Anna G. Stefanopoulou and Kyung-Won Suh. Mechatronics in fuel cell systems. Control Engineering Practice, 15(3):277 - 289, 2007. Selected Papers Presented at the Third IFAC Symposium on Mechatronic Systems (2004), Third IFAC Symposium on Mechatronic Systems. [ bib | DOI | http ]
[11] A. Vahidi, I. Kolmanovsky, and A. Stefanopoulou. Constraint handling in a fuel cell system: A fast reference governor approach. IEEE Transactions on Control Systems Technology, 15(1):86-98, Jan. 2007. [ bib | DOI ]
[10] A. Ingimundarson, A. G. Stefanopoulou, and D. McKay. Model based detection of hydrogen leaks in a fuel cell stack. In Proc. and 2005 European Control Conference Decision and Control CDC-ECC '05. 44th IEEE Conference on, pages 1017-1022, 12-15 Dec. 2005. [ bib ]
[9] A. Ingimundarson, A. G. Stefanopoulou, and D. McKay. Model based detection of hydrogen leaks in a fuel cell stack. In Proceedings of the 44th IEEE Conference on Decision and Control, Seville, Spain, 2005. [ bib | pdf ]
[8] Kyung-Won Suh and A. G. Stefanopoulou. Coordination of converter and fuel cell controllers. In Proc. IEEE International Symposium on Mediterrean Conference on Control and Automation Intelligent Control, pages 563-568, 2005. [ bib | DOI ]
[7] Kyung-Won Suh and A. G. Stefanopoulou. Control and coordination of air compressor and voltage converter in load-following fuel cells. International Journal of Energy Research, 29, 2005. [ bib ]
[6] A. Vahidi, I. Kolmanovsky, and A. Stefanopoulou. Constraint management in fuel cells: a fast reference governor approach. In Proc. American Control Conference the 2005, pages 3865-3870, 8-10 June 2005. [ bib | DOI | pdf ]
[5] J.T. Pukrushpan, H. Peng, and A.G. Stefanopoulou. Modeling and analysis of fuel cell reactant flow for automotive applications. Journal of Dynamic Systems, Measurement and Control, 126(1):14-25, March 2004. [ bib | pdf ]
[4] J. T. Pukrushpan, A. G. Stefanopoulou, and Huei Peng. Control of fuel cell breathing. IEEE Control Systems Magazine, 24(2):30-46, Apr 2004. [ bib | DOI | pdf ]
[3] S. Gelfi, A. G. Stefanopoulou, J. T. Pukrushpan, and Huei Peng. Dynamics of low-pressure and high-pressure fuel cell air supply systems. In Proc. American Control Conference the 2003, volume 3, pages 2049-2054, June 2003. [ bib | DOI | pdf ]
[2] J. T. Pukrushpan, A. G. Stefanopoulou, and Huei Peng. Modeling and control for pem fuel cell stack system. In Proc. American Control Conference the 2002, volume 4, pages 3117-3122, May 8-10 2002. [ bib | DOI ]
[1] Jay Pukrushpan, Anna Stefanopoulou, and Huei Peng. Simulation and analysis of transient fuel cell system performance based on a dynamic reactant flow model. In Proc. of the 2002 IMECE conference, 2002. [ bib | pdf ]

Fuel Cell Vehicle Control
[13] Giovanni Fiengoa Domenico Di Domenicoa and Anna Stefanopoulou. A decoupled controller for fuel cell hybrid electric power split. International Journal of Systems Science, 41(4):447-456, April 2010. [ bib | DOI ]
[12] E. A. Muller, A. G. Stefanopoulou, and L. Guzzella. Optimal power control of hybrid fuel cell systems for an accelerated system warm-up. IEEE Transactions on Control Systems Technology, 15(2):290-305, March 2007. [ bib | DOI ]
[11] Eric A. Muller and Anna G. Stefanopoulou. Analysis, modeling, and validation for the thermal dynamics of a polymer electrolyte membrane fuel cell system. Journal of Fuel Cell Science and Technology, 3(2):99-110, 2006. [ bib | DOI | http ]
[10] Arlette L. Schilter, Denise A. McKay, and Anna G. Stefanopoulou. Parameterization of fuel cell stack voltage: Issues on sensitivity, cell-to cell variation, and transient response. volume 2006, pages 307-317. ASME, 2006. [ bib | DOI | http ]
[9] Kyung-Won Suh and A. G. Stefanopoulou. Inherent performance limitations of power-autonomous fuel cell system. In Proc. American Control Conference, page 6pp., 14-16 June 2006. [ bib | DOI ]
[8] Olle Sundstrom and Anna Stefanopoulou. Optimal power split in fuel cell hybrid electric vehicle with different battery sizes, drive cycles, and objectives. In Proc. IEEE Computer Aided Control System Design IEEE International Conference on Control Applications IEEE International Symposium on Intelligent Control, pages 1681-1688, 4-6 Oct. 2006. [ bib | DOI ]
[7] A. Vahidi, A. Stefanopoulou, and Huei Peng. Current management in a hybrid fuel cell power system: A model-predictive control approach. IEEE Transactions on Control Systems Technology, 14(6):1047-1057, Nov. 2006. [ bib | DOI ]
[6] Eric A. Muller and Anna G. Stefanopoulou. Analysis, modeling, and validation for the thermal dynamics of a polymer electrolyte membrane fuel cell system. In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology (FUELCELL2005), volume 2005, pages 389-404, May 2005. [ bib | DOI | pdf | http ]
[5] A. Vahidi, A. Stefanopoulou, and Huei Peng. Model predictive control for starvation prevention in a hybrid fuel cell system. In Proc. American Control Conference the 2004, volume 1, pages 834-839, June 2004. [ bib | pdf ]
[4] Zoran Filipi, Loucas Louca, Anna Stefanopoulou, Jay Pukrushpan, Burit Kittirungsi, and Huei Peng. Fuel cell apu for silent watch and mild electrification of a medium tactical truck. Technical report, SAE 2004-01-1477, 2004. [ bib | pdf ]
[3] Jay T. Pukrushpan, Huei Peng, and Anna G. Stefanopoulou. Control-oriented modeling and analysis for automotive fuel cell systems. Journal of Dynamic Systems, Measurement, and Control, 126(1):14-25, 2004. [ bib | DOI | http ]
[2] Jay T. Pukrushpan, Anna G. Stefanopoulou, and Huei. Peng. Control Of Fuel Cell Power Systems. Number ISBN: 1-85233-816-4 in Advances in industrial control. Springer, 2004. [ bib ]
[1] Anna G. Stefanopoulou. Mechatronics in fuel cell systems. In Proceedings of the International Federation of Control, Symposium in Mechatronics, Sydney, Sept 2004. [ bib | pdf ]

Fuel Processor Control and Power Generation
[12] V. Tsourapas, Jing Sun, and A. Stefanopoulou. Incremental step reference governor for load conditioning of hybrid fuel cell and gas turbine power plants. Control Systems Technology, IEEE Transactions on, 17(4):756-767, July 2009. [ bib | DOI ]
[11] Vasilis Tsourapas, Jing Sun, and Anna Stefanopoulou. Control oriented analysis of a hybrid solid oxide fuel cell and gas turbine system. Journal of Fuel Cell Science and Technology, 6(4):041008, 2009. [ bib | DOI | http ]
[10] Vasilis Tsourapas, Anna G. Stefanopoulou, and Jing Sun. Model-based control of an integrated fuel cell and fuel processor with exhaust heat recirculation. Control Systems Technology, IEEE Transactions on, 15(2):233-245, March 2007. [ bib | DOI ]
[9] V. Tsourapas, Vasilis Tsourapas, and A. G. Stefanopoulou. Model-based control of an integrated fuel cell and fuel processor with exhaust heat recirculation. IEEE Transactions on Control Systems Technology, 15(2):233-245, March 2007. [ bib | DOI ]
[8] Vasilis Tsourapas, Jing Sun, and Anna Stefanopoulou. Performance evaluation of a thermally integrated fuel cell system in the presence of uncertainties. volume 2006, pages 291-300. ASME, 2006. [ bib | DOI | http ]
[7] J. T. Pukrushpan, A. G. Stefanopoulou, S. Varigonda, L. M. Pedersen, S. Ghosh, and Huei Peng. Control of natural gas catalytic partial oxidation for hydrogen generation in fuel cell applications. IEEE Transactions on Control Systems Technology, 13(1):3-14, Jan. 2005. [ bib | DOI | pdf ]
[6] V. Tsourapas, A. Stefanopoulou, and Jing Sun. Dynamics, optimization and control of a fuel cell based combined heat power (chp) system for shipboard applications. In Proc. American Control Conference the 2005, pages 1993-1998, 8-10 June 2005. [ bib | DOI | pdf ]
[5] Jay Pukrushpan, Anna Stefanopoulou, and Subbarao Varigonda. Control-oriented model of fuel processor for hydrogen generation in fuel cell applications. In IFAC Symposium in Adavnces in Automotive Systems,, Salerno, 2004. [ bib | pdf ]
[5] Jay Pukrushpan, Anna Stefanopoulou, and Subbarao Varigonda. Control-oriented model of fuel processor for hydrogen generation in fuel cell applications. In IFAC Symposium in Adavnces in Automotive Systems,, Salerno, 2004. [ bib | pdf ]
[3] Vasilis Tsourapas, Jing Sun, and Anna Stefanopoulou. Modeling and dynamics of a fuel cell combined heat power system for marine applications. IASME Transactions, 2(1):288-293, 2004. [ bib | pdf ]
[2] J. T. Pukrushpan, A. G. Stefanopoulou, S. Varigonda, L. M. Pedersen, S. Ghosh, and Huei Peng. Control of natural gas catalytic partial oxidation for hydrogen generation in fuel cell applications. In Proc. American Control Conference the 2003, volume 3, pages 2030-2036, June 2003. [ bib | DOI | pdf ]
[1] S. Varigonda, J. Pukrushpan, and A. G. Stefanopoulou. Challenges in fuel cell power plant control: The role of system level models. In AIChE Spring Meeting, 2003. [ bib | pdf ]


Detection and Adaptation in Flex-Fuel Vehicles

[12] E. Hellström, D. Lee, L. Jiang, A. G. Stefanopoulou, and H. Yilmaz. On-board calibration of spark timing by extremum seeking for flex-fuel engines. IEEE Transactions on Control Systems Technology, 2013. To Appear. [ bib | DOI ]
[11] K. Ahn, A.G. Stefanopoulou, and M. Jankovic. Puddle dynamics and air-to-fuel ratio compensation for gasoline-ethanol blends in flex-fuel engines. IEEE Trans. Control Syst. Technol., 2010. [ bib | pdf ]
[10] K. Ahn, A.G. Stefanopoulou, L. Jiang, and H. Yilmaz. Ethanol content estimation in flex fuel direct injection engines using in-cylinder pressure measurements. Technical Report 2010-01-0166, SAE World Congress, 2010. [ bib | pdf ]
[9] L. Jiang, H. Yilmaz, M. Christie, K. Ahn, and A. Stefanopoulou. Optimally controlled flexible fuel vehicle. In 10th Stuttgart International Symposium, 2010. [ bib | pdf ]
[8] D. Lee, L. Jiang, H. Yilmaz, and A.G. Stefanopoulou. Air charge control for turbocharged spark ignition engines with internal exhaust gas recirculation. In 2010 American Control Conference, Baltimore, Maryland, USA, Jun 2010. [ bib | pdf ]
[7] Kyung ho Ahn, A.G. Stefanopoulou, and M. Jankovic. Fuel puddle model and afr compensator for gasoline-ethanol blends in flex-fuel engines. In Vehicle Power and Propulsion Conference, 2009. VPPC '09. IEEE, pages 1148-1155, Sept. 2009. [ bib | DOI | pdf ]
[6] Kyung-ho Ahn, Anna G. Stefanopoulou, and Mrdjan Jankovic. Tolerant ethanol estimation in flex-fuel vehicles during maf sensor drifts. In Proceedings of the ASME 2009 Dynamic Systems and Control Conference, number DSCC2009-2708 in Paper MoAT4.3, Hollywood, California, USA, Oct 2009. [ bib | pdf ]
[5] L. Jiang, J. Vanier, H. Yilmaz, and A. Stefanopoulou. Parameterization and simulation for a turbocharged spark ignition direct injection engine with variable valve timing. Technical Report 2009-01-0680, SAE, 2009. [ bib | pdf ]
[4] Nestor Oliverio, Anna Stefanopoulou, Li Jiang, and Hakan Yilmaz. Ethanol detection in flex-fuel direct injection engines using in-cylinder pressure measurements. Technical Report 2009-01-0657, SAE, 2009. [ bib ]
[3] N. Oliverio, A. Stefanopoulou, L. Jiang, and H. Yilmaz. Ethanol detection in flex-fuel direct injection engines using in-cylinder pressure measurements. SAE International Journal of Fuels and Lubricants, 2(1):229-241, Oct 2009. [ bib | pdf ]
[2] Nestor H. Oliverio, Li Jiang, Hakan Yilmaz, and Anna G. Stefanopoulou. Modeling of fuel ethanol concentration effect on cylinder pressure evolution in direct-injection flex-fuel engines. In Proceedings of the American Control Conference, 2009. [ bib | pdf ]
[1] Kyung-ho Ahn, Anna G. Stefanopoulou, and Mrdjan Jankovic. Estimation of ethanol content in flex-fuel vehicles using an exhaust gas oxygen sensor: Model, tuning and sensitivity. In Proceedings of Dynamic Systems and Control Conference (DSCC08), Paper TuAT5.3, 2008. [ bib | pdf ]

Controlled Autoignition for HCCI Engine

[23] E. Hellström, A. G. Stefanopoulou, and L. Jiang. Cyclic variability and dynamical instabilities in autoignition engines with high residuals. IEEE Transactions on Control Systems Technology, 2013. To Appear. [ bib | DOI | pdf ]
[22] P. Gorzelic, E. Hellström, A. G. Stefanopoulou, and L. Jiang. Model-based feedback control for an automated transfer out of SI operation during SI to HCCI transitions in gasoline engines. In Proc. ASME Dynamic Systems and Control Conference, Fort Lauderdale, FL, USA, 2012. [ bib | pdf ]
[21] P. Gorzelic, E. Hellström, A. G. Stefanopoulou, L. Jiang, and S. Gopinath. A coordinated approach for throttle and wastegate control in turbocharged spark ignition engines. In Proc. 24th Chinese Control and Decision Conference, pages 1524-1529, Taiyuan, China, 2012. [ bib | DOI | pdf ]
[20] E. Hellström, J. Larimore, A. G. Stefanopoulou, J. Sterniak, and L. Jiang. Quantifying cyclic variability in a multi-cylinder HCCI engine with high residuals. Journal of Engineering for Gas Turbines and Power, 134(11):112803, 2012. [ bib | DOI | pdf ]
[19] E. Hellström, J. Larimore, A. G. Stefanopoulou, J. Sterniak, and L. Jiang. Quantifying cyclic variability in a multi-cylinder HCCI engine with high residuals. In ASME Internal Combustion Engine Division Spring Tecnical Conference, Torino, Italy, 2012. ICEF2012-81107. [ bib | pdf ]
[18] E. Hellström, A. G. Stefanopoulou, and L. Jiang. Reducing cyclic dispersion in autoignition combustion by controlling fuel injection timing. In Proc. 51st IEEE Conference on Decision and Control, Maui, HI, USA, 2012. [ bib | pdf ]
[17] E. Hellström, A. G. Stefanopoulou, J. Vávra, A. Babajimopoulos, D. Assanis, L. Jiang, and H. Yilmaz. Understanding the dynamic evolution of cyclic variability at the operating limits of HCCI engines with negative valve overlap. In SAE World Congress, number 2012-01-1106 in SAE Technical Paper Series, Detroit, MI, USA, 2012. [ bib | DOI | pdf ]
[16] E. Hellström, A. G. Stefanopoulou, J. Vávra, A. Babajimopoulos, D. Assanis, L. Jiang, and H. Yilmaz. Understanding the dynamic evolution of cyclic variability at the operating limits of HCCI engines with negative valve overlap. SAE International Journal of Engines, 5(3):995-1008, 2012. Also in SAE World Congress number 2012-01-1106 in SAE Technical Paper Series. [ bib | DOI | pdf ]
[15] S. Jade, E. Hellström, L. Jiang, and A. G. Stefanopoulou. Fuel governor augmented control of recompression HCCI combustion during large load transients. In Proc. American Control Conference, pages 2072-2077, Montréal, Canada, 2012. [ bib | pdf ]
[14] J. Larimore, E. Hellström, J. Sterniak, L. Jiang, and A. G. Stefanopoulou. Experiments and analysis of high cyclic variability at the operational limits of spark-assisted HCCI combustion. In Proc. American Control Conference, pages 2072-2077, Montréal, Canada, 2012. [ bib | pdf ]
[13] E. Hellström and A. G. Stefanopoulou. Modeling cyclic dispersion in autoignition combustion. In Proc. 50th IEEE Conference on Decision and Control, pages 6834-6839, Orlando, FL, USA, 2011. [ bib | DOI | pdf ]
[12] S. Jade, E. Hellström, A. G. Stefanopoulou, and L. Jiang. On the influence of composition on the thermally-dominant recompression HCCI combustion dynamics. In Proc. ASME Dynamic Systems and Control Conference, pages 677-684, Arlington, VA, USA, 2011. [ bib | DOI | pdf ]
[11] Donghoon Lee, Li Jiang, H. Yilmaz, and A.G. Stefanopoulou. Air charge control for turbocharged spark ignition engines with internal exhaust gas recirculation. In American Control Conference (ACC), 2010, pages 1471 -1476, 30 2010-july 2 2010. [ bib ]
[10] Donghoon Lee, A.G. Stefanopoulou, S. Makkapati, and M. Jankovic. Modeling and control of a heated air intake homogeneous charge compression ignition (hcci) engine. In American Control Conference (ACC), 2010, pages 3817 -3823, 30 2010-july 2 2010. [ bib ]
[9] C. J. Chiang and A. G. Stefanopoulou. Sensitivity analysis of combustion timing of homogeneous charge compression ignition gasoline engines. Journal of Dynamic Systems, Measurement and Control, 131(1):014506-014510, 2009. [ bib | pdf ]
[8] Chia-Jui Chiang, A. G. Stefanopoulou, and M. Jankovic. Nonlinear observer-based control of load transitions in homogeneous charge compression ignition engines. IEEE Transactions on Control Systems Technology, 15(3):438-448, May 2007. special issue in Control Applications in Automotive Engineering. [ bib | DOI | pdf ]
[7] Chia-Jui Chiang and A. G. Stefanopoulou. Stability analysis in homogeneous charge compression ignition (hcci) engines with high dilution. IEEE Transactions on Control Systems Technology, 15(2):209-219, March 2007. [ bib | DOI | pdf ]
[6] C. J. Chiang and A. G. Stefanopoulou. Dynamics of homogeneous charge compression ignition (hcci) engines with high dilution. In Proceedings of the American Control Conference, pages 2979-2984, 9-13 July 2007. [ bib | DOI | pdf ]
[5] C. J. Chiang and A. G. Stefanopoulou. Sensitivity analysis of combustion timing and duration of homogeneous charge compression ignition (hcci) engines. In Proc. American Control Conference, pages 1857-1862, 14-16 June 2006. [ bib | DOI | pdf ]
[4] D.J. Rausen, A.G. Stefanopoulou, J.A. Kang, J.-M.And Eng, and T.-W Kuo. A mean-value model for control of homogeneous charge compression ignition (hcci) engines. Transactions of the ASME. Journal of Dynamic Systems, Measurement and Control, 3(3):355-362, September 2005. [ bib | pdf ]
[3] C. J. Chiang and A. G. Stefanopoulou. Control of thermal ignition in gasoline engines. In Proc. American Control Conference the 2005, volume 6, pages 3847-3852, 8-10 June 2005. [ bib | DOI | pdf ]
[2] D. J. Rausen, A. G. Stefanopoulou, J. M. Kang, J. A. Eng, and T. W. Kuo. A mean-value model for control of homogeneous charge compression ignition (hcci) engines. In Proceedings of the American Control Conference, volume 1, pages 125-131, 30 June-2 July 2004. [ bib | pdf ]
[1] C. J. Chiang and A. G. Stefanopoulou. Steady-state multiplicity and stability of thermal equilibria in homogeneous charge compression ignition (hcci) engines. In Proceedings of the 43rd IEEE Conference on Decision and Control, volume 2, pages 1676-1681, 14-17 Dec. 2004. [ bib | pdf ]

Electromechanical Valve Actuator

[11] K.S. Peterson, J.W. Grizzle, and A.G. Stefanopoulou. Nonlinear magnetic levitation of automotive engine valves. In Third IFAC Symposium on Mechatronic Systems, pages 645-650, 2004. [ bib | pdf ]
[10] Katherine S. Peterson and Anna G. Stefanopoulou. Extremum seeking control for soft landing of an electromechanical valve actuator. Automatica, 40(6):1063 - 1069, 2004. [ bib | DOI | pdf | http ]
[9] K.S. Peterson and A.G. Stefanopoulou. Rendering the electromechanical valve actuator globally asymptotically stable. In Decision and Control, 2003. Proceedings. 42nd IEEE Conference on, volume 2, pages 1753-1758, 2003. [ bib | DOI | pdf ]
[8] K. S. Peterson, A. G. Stefanopoulou, and Y Wang. Control of electromechanical actuators: Valves tapping in rhythm. In L. Giarre' and B. Bamieh, editors, Multidisciplinary Research in Control, The Mohammed Dahleh Symposium 2002, volume 289 of Lecture Notes in Control and Information Sciences. Springer-Verlag, 2003. ISBN 3-540-00917-5. [ bib | DOI | pdf ]
[7] K. S. Peterson, A. G. Stefanopoulou, Y. Wang, and T. Megli. Virtual lash adjuster for an electromechanical valve actuator through iterative learning control. In ASME Conference Proceedings, ASME 2003 International Mechanical Engineering Congress and Exposition (IMECE2003), volume 2003, pages 295-301. ASME, 2003. [ bib | DOI | pdf | http ]
[6] K.S. Peterson, W. Hoffman, and A. Stefanopoulou. Experimental results and implementation issues of an iterative learning controller for soft landing of an electromechanical valve actuator. In Proceedings of the 10th Mediterranean Conference on Control and Automation - MED2002, Lisbon, Portugal, July 9-12, 2002., 2002. [ bib | pdf ]
[5] K. Peterson, A. Stefanopoulou, T. Megli, and M. Haghgooie. Output observer based feedback for soft landing of electromechanical camless valvetrain actuator. In American Control Conference, 2002. Proceedings of the 2002, volume 2, pages 1413-1418, 2002. [ bib | DOI | pdf ]
[4] K.S. Peterson, A.G. Stefanopoulou, Y. Wang, and M. Haghgooie. Nonlinear self-tuning control for soft landing of an electromechanical valve actuator. In Mechatronic Systems 2002: A Proceedings Volume from the 2nd IFAC Conference, pages 191-196, 2002. [ bib | pdf ]
[3] Y. Wang, A. Stefanopoulou, K. Peterson, T. Megli, and M. Haghgooie. Modelling and control of electromechanical valve actuator. Technical Report 2002-01-1106, SAE, 2002. [ bib | pdf ]
[2] W. Hoffmann and A.G. Stefanopoulou. Iterative learning control of electromechanical camless valve actuator. In American Control Conference, 2001. Proceedings of the 2001, volume 4, pages 2860-2866, 2001. [ bib | DOI | pdf ]
[1] Y. Wang, A. Stefanopoulou, I. Haghgooie, M.and Kolmanovsky, and M. Hammoud. Modeling of an electromechanical valve actuator for a camless engine. In AVEC '2000: 5th International Symposium on Advanced Vehicle Control, number 93, 2000. [ bib | pdf ]

Control Architectures: Analysis and Design

[3] S. Liu and A.G. Stefanopoulou. Effects of control structure on performance for an automotive powertrain with a continuously variable transmission. Control Systems Technology, IEEE Transactions on, 10(5):701-708, Sep 2002. [ bib | DOI | pdf ]
[2] I.V. Kolmanovsky and A.G. Stefanopoulou. Optimal control techniques for assessing feasibility and defining subsystem level requirements: an automotive case study. Control Systems Technology, IEEE Transactions on, 9(3):524-534, May 2001. [ bib | DOI | pdf ]
[1] A.G. Stefanopoulou, K.R. Butts, J.A. Cook, J.S. Freudenberg, and J.W. Grizzle. Consequences of modular controller development for automotive powertrains: a case study. In Decision and Control, 1995., Proceedings of the 34th IEEE Conference on, volume 1, pages 768-773, Dec 1995. [ bib | DOI | pdf ]

Longitudinal Control of Heavy Duty Vehicles

[10] A. Vahidi, A. Stefanopoulou, and H. Peng. Recursive least squares with forgetting for online estimation of vehicle mass and road grade: theory and experiments. Vehicle System Dynamics, 43(1):31-55(25), 2005. [ bib | DOI | pdf | http ]
[9] M. Druzhinina and A. Stefanopoulou. Speed control experiments for heavy duty vehicles with coordinated friction and engine compression brakes. International Journal of Heavy Vehicle Systems, 11(3-4):237-256, 2004. [ bib | DOI | http ]
[8] Ardalan Vahidi, Anna Stefanopoulou, and Huei Peng. Adaptive model predictive control for vehicle braking assist system design. In ASME Conference Proceedings, volume 2004, pages 181-188. ASME, 2004. [ bib | DOI | http ]
[7] A. Vahidi, A. Stefanopoulou, and H. Peng. Experiments for online estimation of heavy vehicles mass and time-varying road grade. In Proceedings IMECE DSCD 2003_42807, Jan 2003, 2003. [ bib | pdf ]
[6] M. Druzhinina, L. Moklegaard, and A. Stefanopoulou. Speed gradient approach to longitudinal control of heavy -duty vehicles equipped with variable compression brake. IEEE Transactions on Control System Technology, 10(2):209-221, 2002. [ bib | DOI | pdf ]
[5] M. Druzhinina and A.G. Stefanopoulou. Speed control experiments for commercial heavy vehicles with coordinated friction and engine compression brakes. American Control Conference, 2002. Proceedings of the, 3:2546-2551, 2002. [ bib | DOI | pdf ]
[4] Maria Druzhinina, Anna Stefanopoulou, and Lasse Moklegaard. Adaptive continuously variable compression braking control for heavy-duty vehicles. Journal of Dynamic Systems, Measurement, and Control, 124(3):406-414, 2002. [ bib | DOI | pdf | http ]
[3] L. Moklegaard, M. Druzhinina, and A. Stefanopoulou. Brake valve timing and fuel injection: a unified engine torque actuator for heavy-duty vehicles. Journal of Vehicle System Dynamics, 36(2-3):179-201(23), 2001. [ bib | DOI | pdf ]
[2] M. Druzhinina, L. Moklegaard, and A. Stefanopoulou. Speed gradient approach to longitudinal control of heavy -duty vehicles equipped with variable compression brake. In Proceedings of AVEC 2000. 5th Int'l Symposium on Advanced Vehicle Control. August 22-24, 2000, 2000. [ bib | pdf ]
[1] L. Moklegaard, M. Druzhinina, and A. Stefanopoulou. Brake valve timing and fuel injection: a unified engine torque actuator for heavy-duty vehicles. In Proceedings of AVEC 2000. 5th Int'l Symposium on Advanced Vehicle Control. August 22-24, 2000, 2000. [ bib | pdf ]

Control of Turbocharged Diesel Engines

[14] A. G. Stefanopoulou, O. F. Storset, and R. Smith. Pressure and temperature-based adaptive observer of air charge for turbocharged diesel engines. International Journal of Robust and Nonlinear Control, 14(6):543-560, 2004. [ bib | DOI | pdf | http ]
[13] Ove F. Storset, Anna G. Stefanopoulou, and Roy Smith. Adaptive air charge estimation for turbocharged diesel engines without exhaust gas recirculation. Journal of Dynamic Systems, Measurement, and Control, 126(3):633-643, 2004. [ bib | DOI | pdf | http ]
[12] Y. Wang, A. Stefanopoulou, and R. Smith. Inherent limitations and control design for camless engine idle speed dynamics. International Journal of Robust and Nonlinear Control, 11(11):1023-1042, 2001. [ bib | DOI | pdf | http ]
[11] M.J. van Nieuwstadt, I.V. Kolmanovsky, P.E. Moraal, A. Stefanopoulou, and M. Jankovic. Egr-vgt control schemes: experimental comparison for a high-speed diesel engine. IEEE Control Systems Magazine, 20(3):63-79, June 2000. [ bib | pdf ]
[10] M. Druzhinina, L. Moklegaard, and A.G. Stefanopoulou. Compression braking control for heavy-duty vehicles. In Proceedings of the 2000 American Control Conference, volume 4, pages 2543-2547, 2000. [ bib | DOI | pdf ]
[9] I. Kolmanovsky and A.G. Stefanopoulou. Evaluation of turbocharger power a assist system using optimal control techniques. Technical Report 2000-01-0519, SAE, 2000. [ bib | pdf ]
[8] L. Moklegaard, A.G. Stefanopoulou, and J.H. Schmidt. Transition from combustion to variable compression braking. Technical Report 2000-01-1228, SAE, 2000. [ bib | pdf ]
[7] A.G. Stefanopoulou, I. Kolmanovsky, and J.S. Freudenberg. Control of variable geometry turbocharged diesel engines for reduced emissions. Control Systems Technology, IEEE Transactions on, 8(4):733-745, Jul 2000. [ bib | DOI | pdf ]
[6] A. Stefanopoulou and R. Smith. Maneuverability and smoke emission constraints in marine diesel propulsion. Control Engineering Practice, 8(9):1023 - 1031, 2000. [ bib | DOI | pdf | http ]
[5] O.F. Storset, A. Stefanopoulou, and R. Smith. Air charge estimation for turbocharged diesel engines. In Proceedings of the 2000 American Control Conference, volume 1, pages 39-44, Sep 2000. [ bib | DOI | pdf ]
[4] I. Kolmanovsky, A.G. Stefanopoulous, and B.K. Powell. Improving turbocharged diesel engine operation with turbo power assist system. In Proceedings of the 1999 IEEE International Conference on Control Applications, 1999., volume 1, pages 454-459, 1999. [ bib | DOI | pdf ]
[3] M. van Nieuwstadt, P.E. Moraal, I.V. Kolmanovsky, A. Stefanopoulou, P. Wood, and M. Criddle. Decentralized and multivariable designs for egr-vgt control of a diesel engines. In Advances in automotive control 1998 : a proceedings volume from the 2nd IFAC workshop, 1998. [ bib | pdf ]
[2] A.G. Stefanopoulou and R. Smith. Emissions and performance tradeoffs for advanced marine diesel propulsion. In IFAC Workshop on Advances in Automotive Control, 1998. [ bib | pdf ]
[1] I. Kolmanovsky, P. Moraal, M. van Nieuwstadt, , and A. Stefanopoulou. Issues in modeling and control of intake flow in variable geometry turbocharged engines. In Proceedings of the 18th IFIP conference on system modeling and optimization, page 436, 1997. [ bib | pdf ]


Control of Engines with Variable Valve Timing

[18] Hakan Yilmaz and Anna Stefanopoulou. Control of charge dilution in turbocharged diesel engines via exhaust valve timing. Journal of Dynamic Systems, Measurement, and Control, 127(3):363-373, 2005. [ bib | DOI | pdf | http ]
[17] H. Yilmaz and A. Stefanopoulou. Control of charge dilution in turbocharged diesel engines via exhaust valve timing. In American Control Conference, 2003. Proceedings of the, volume 1, pages 761-766 vol.1, June 2003. [ bib | pdf ]
[16] M.-S. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. B. Levin. Control-oriented model for camless intake process-part i. Journal of Dynamic Systems, Measurement, and Control, 122(1):122-130, 2000. [ bib | DOI | pdf | http ]
[15] M.-S. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. B. Levin. Control of camless intake process-part ii. Journal of Dynamic Systems, Measurement, and Control, 122(1):131-139, 2000. [ bib | DOI | pdf | http ]
[14] A.G. Stefanopoulou, J.S. Freudenberg, and J.W. Grizzle. Variable camshaft timing engine control. Control Systems Technology, IEEE Transactions on, 8(1):23-34, Jan 2000. [ bib | DOI | pdf ]
[13] M.-S. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. B. Levin. Control-oriented model for camless intake process-part i. In International Mechanical Engineering Congress & Exposition (!MECE), Dynamic Systems & Control Division (DSCD) 1999,Proceedings of, pages 179-186, 1999. [ bib | pdf ]
[12] M.-S. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. B. Levin. Control of camless intake process-part ii. In International Mechanical Engineering Congress & Exposition (!MECE), Dynamic Systems & Control Division (DSCD) 1999,Proceedings of, pages 187-194,, 1999. [ bib | pdf ]
[11] S.C. Hsieh, J.S. Freudenberg, and A.G. Stefanopoulou. Multivariable controller structure in a variable cam timing engine with electronic throttle and torque feedback. In Control Applications, 1999. Proceedings of the 1999 IEEE International Conference on, volume 1, pages 465-470 vol. 1, 1999. [ bib | DOI | pdf ]
[10] A.G. Stefanopoulou and I. Kolmanovsky. Analysis and control of transient torque response in engines with internal exhaust gas recirculation. Control Systems Technology, IEEE Transactions on, 7(5):555-566, Sep 1999. [ bib | DOI | pdf ]
[9] A. G. Stefanopoulou, J. A. Cook, J. W. Grizzle, and J. S. Freudenberg. Joint air-fuel ratio and torque regulation using secondary cylinder air flow actuators. Journal of Dynamic Systems, Measurement, and Control, 121(4):638-647, 1999. [ bib | DOI | pdf | http ]
[8] Yan Wang, A. Stefanopoulou, and M. Levin. Idle speed control: an old problem in a new engine design. In American Control Conference, 1999. Proceedings of the 1999, volume 2, pages 1217-1221 vol.2, Jun 1999. [ bib | DOI | pdf ]
[7] M. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. Levin. Camless engine cotrol for robust unthrottled operation. In Society of Automotive Engineers Special Publication Series SP-1346 SAE981031, 1998. [ bib | pdf ]
[6] M. Jankovic, F. Frischmuth, A. Stefanopoulou, and J.A. Cook. Torque management of engines with variable cam timing. Control Systems Magazine, IEEE, 18(5):34-42, Oct 1998. [ bib | DOI ]
[5] A. G. Stefanopoulou, J. A. Cook, J. W. Grizzle, and J. S. Freudenberg. Control-oriented model of a dual equal variable cam timing spark ignition engine. Journal of Dynamic Systems, Measurement, and Control, 120(2):257-266, 1998. [ bib | DOI | pdf | http ]
[4] S.C. Hsieh, A.G. Stefanopoulou, J.S. Freudenberg, and K.R. Butts. Emission and drivability tradeoffs in a variable cam timing si engine with electronic throttle. In American Control Conference, 1997. Proceedings of the 1997, volume 1, pages 284-288 vol.1, Jun 1997. [ bib | DOI | pdf ]
[3] A.G. Stefanopoulou and I. Kolmanovsky. Dynamic scheduling of internal exhaust gas recirculation systems. In IMECE 1997, Sixth ASME Symposium on Advanced Automotive Technologies, Proceedings of, volume 61, pages 671-678, 1997. [ bib | pdf ]
[2] A.G. Stefanopoulou, J.A. Cook, J.S. Freudenberg, J.W. Grizzle, M. Haghgooie, and P.S. Szpak. Modeling and control of a spark ignition engine with variable cam timing. In American Control Conference, 1995. Proceedings of the, volume 4, pages 2576-2581 vol.4, Jun 1995. [ bib | pdf ]
[1] A.G. Stefanopoulou, J.W. Grizzle, and J.S. Freudenberg. Engine air-fuel ratio and torque control using secondary throttles. In Decision and Control, 1994., Proceedings of the 33rd IEEE Conference on, volume 3, pages 2748-2753 vol.3, Dec 1994. [ bib | DOI | pdf ]

[3] A. G. Stefanopoulou. Modeling and Control of Advanced Technology Engines. PhD thesis, University of Michigan, Feb. 1996. [ bib | pdf ]
[2] S. Diop, J.W. Grizzle, P.E. Moraal, and A. Stefanopoulou. Interpolation and numerical differentiation for observer design. In American Control Conference, 1994, volume 2, pages 1329-1333 vol.2, June-1 July 1994. [ bib | DOI | pdf ]
[1] M.G. Parsons, A.C. Chubb, Yusong Cao, and A.G. Stefanopoulou. An initial assessment of fuzzy logic vessel path control. In Autonomous Underwater Vehicle Technology, 1994. AUV '94., Proceedings of the 1994 Symposium on, pages 225-232, Jul 1994. [ bib | DOI ]

Patents

8. US 6,681,728 Method for controlling an electromechanical actuator for Fuel Air Charge Valve,  K.S. Peterson, A.G. Stefanopoulou, T. Megli, Y Wang, M. Haggooie, Jan 2004< o:p>
7. US 6,579,206 “Coordinated control for a powertrain with a continuously variable transmission,” Sharon Liu, Anna Stefanopoulou, June 2003
6.    US 6,568,173 B1 “Control method for turbocharged diesel engine aftertreatment system”, Ilya Kolmanovsky, Anna Stefanopoulou, June 2003
5.    U.S. 6,186,124 “System and Method For Controlling Camshaft Timing, Air/Fuel Ratio, and Throttle Position in an Automotive Internal Combustion Engine”, A.G.  Stefanopoulou and M. Jankovic. This application is a divisional of Ser. No.  09/005,571, now U.S.  Pat. No. 6,006,725, Feb  2001.
4.    U.S. 6,076,353 “A Method for Coordination and Calibration of Variable Geometry Turbocharger and Exhaust Gas Recirculation in Diesel Engines”, J. S. Freudenberg, I. V. Kolmanovsky, A. G. Stefanopoulou, Jan 1999.
3.    U.S. 6,006,725 “System and Method For Controlling Camshaft Timing, Air/Fuel Ratio, and Throttle Position in an Automotive Internal Combustion Engine”, M. Jankovic, A.G.  Stefanopoulou, Jan 1998.
2.    U.S. 5,787,848  “A Method of System for Operating An Internal Combustion Engine Having Variable Valve Timing”, A. G.  Stefanopoulou, I. V. Kolmanovsky, Dec 1997.
1.    U.S. 5,755,202 “A Method for Reducing Feedgas Emissions”, A. G. Stefanopoulou, K.R. Butts, Oct 1996.


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