Publications

 

Detection and Adaptation in Flex-Fuel Vehicles:

[1] Hakan Yilmaz Anna G. Stefanopoulou Nestor H. Oliverio, Li Jiang. 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 ]
[2] Mrdjan Jankovic Kyung-ho Ahn, Anna G. Stefanopoulou. 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 ]
[3] Li Jiang Hakan Yilmaz Nestor Oliverio, Anna Stefanopoulou. Ethanol detection in flex-fuel direct injection engines using in-cylinder pressure measurements. In SAE 2009-01-0657. [ bib ]

Controlled Autoignition for HCCI Engine:

[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] 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 ]
[3] A.G.; Kang J.-M.; Eng J.A.; Kuo T.-W Rausen, D.J. Stefanopoulou. 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 ]
[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 ]

Hybrid Battery Power: Estimation and Control:

[6] 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 ]
[5] Carmelo Speltino, Domenico Di Domenico, Giovanni Fiengo, and Anna G. Stefanopoulou. Comparison of reduced order lithium-ion battery models for automotive applications. In Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference, October 2009. [ bib | pdf ]
[4] 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 ]
[3] 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 ]
[2] G. Domenico, D. 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 ]
[1] Stefanopoulou A. Domenico, D. and G. Di Fiengo. Psm: Lithium-ion battery state of charge (soc) and critical surface charge (csc) estimation using an electrochemical model-driven extended kalman filter. In submitted to a special issue of ASME Dynamic System Measurements and Control. [ bib | pdf ]

Fuel Cells:

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

[65] 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 2nd Annual Dynamic Systems and Control Conference, Hollywood, CA, USA, October 12-14 2009. [ bib ]
[64] 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 ]
[63] J. B. Siegel and A. G. Stefanopoulou. Through the membrane & along the channel flooding in PEMFCs. In American Control Conference, 2009. ACC '09., pages 2666-2671, June 2009. [ bib | DOI ]
[62] J.B. Yesilyurt, S.and Siegel and A.G. Stefanopoulou. Effects of nitrogen and water accumulation in the dead-ended-anode operation of pem fuel cells. In 215th ECS Meeting, San Francisco, California, May 24-29 2009. The Electrochemical Society. [ bib ]
[61] 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 ]
[60] Jason B. Siegel, Serhat Yesilyurt, and Anna G. Stefanopoulou. Extracting model parameters and paradigms from neutron imaging of dead-ended anode operation. In Proceedings of FuelCell2009 Seventh International Fuel Cell Science, Engineering and Technology Conference, 2009. [ bib ]
[59] 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 ]
[58] 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 ]
[57] 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 ]
[56] 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 ]
[55] 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 ]
[54] 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 ]
[53] 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 ]
[52] 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 ]
[51] 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 ]
[50] J. B. Siegel, D. A. McKay, and A. G. Stefanopoulou. Modeling and validation of fuel cell water dynamics using neutron imaging. In Proc. American Control Conference, pages 2573-2578, 11-13 June 2008. [ bib | DOI ]
[49] Jason B. Siegel, Denise A. McKay, and Anna G. Stefanopoulou. Measurement of liquid water accumulation in a proton exchange membrane fuel cell with dead-ended anode. volume 2008, pages 757-768. ASME, 2008. [ bib | DOI | http ]
[48] 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 ]
[47] V. Tsourapas, Jing Sun, and A. Stefanopoulou. Incremental step reference governor for load conditioning of hybrid fuel cell and gas turbine power plants. In Proc. American Control Conference, pages 2184-2189, 11-13 June 2008. [ bib | DOI ]
[46] 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 ]
[45] 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 ]
[44] 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 ]
[43] 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 ]
[42] 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 ]
[41] 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 ]
[40] 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 ]
[39] 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 ]
[38] 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 ]
[37] 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 ]
[36] 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 ]
[35] 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 ]
[34] Jay Pukrushpan, Anna Stefanopoulou, Subbarao Varigonda, Jonas Eborn, and Christoph Haugstetter. Control-oriented model of fuel processor for hydrogen generation in fuel cell applications. Control Engineering Practice, 14(3):277 - 293, 2006. Advances in Automotive Control (AC'04). [ bib | DOI | pdf | http ]
[33] 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 ]
[32] 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 ]
[31] 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 ]
[30] 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 ]
[29] 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 ]
[28] 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 ]
[27] 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 ]
[26] 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 ]
[25] 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 ]
[24] 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 ]
[23] 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 ]
[22] 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 ]
[21] 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 ]
[20] 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 ]
[19] 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 ]
[18] 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 ]
[17] 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 ]
[16] 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 ]
[15] 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 ]
[14] 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 ]
[13] 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 ]
[12] 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 ]
[11] Anna G. Stefanopoulou. Mechatronics in fuel cell systems. In Proceedings of the International Federation of Control, Symposium in Mechatronics, Sydney, Sept 2004. [ bib | pdf ]
[10] 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 ]
[9] 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 ]
[8] 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 ]
[7] 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, pages 1-15, Volume PP,&a href='/xpl/tocpreprint.jsp?isnumber=4389040&punumber=87'>Forthcoming& 2003. Accepted for future publication Control Systems Technology. [ bib | DOI ]
[6] 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 ]
[5] 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 ]
[4] 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 ]
[3] B.A. McCain, A.G. Stefanopoulou, and I.V. Kolmanovsky. A dynamic semi-analytic channel-to-channel model of two-phase water distribution for estimation and control of fuel cells. IEEE Transactions Control System Technologyi, In Press. [ bib ]
[2] Eric A. Muller, Florian Klob, Lino Guzzella, and A. Stefanopoulou. Correlating nitrogen accumulation with temporal fuel cell performance. ASME Journal of Fuel Cell Science and Technology, In Press. [ bib ]
[1] V. Tsourapas, J. Sun, and A. G. Stefanopoulou. Control oriented analysis of a hybrid solid oxide fuel cell and gas turbine (sofc/gt) system. ASME Journal on Fuel Cell Science and Technology, In Press. [ bib ]

Fuel Cell Thesis:
[3] Buz A. McCain. Modeling and Analysis for Control of Reactant and Water Distributions in Fuel Cells. PhD thesis, The University of Michigan, 2008. Doctoral Committee: Professor Anna G. Stefanopoulou, Chair Professor N. Harris McClamroch Professor Jeffrey L. Stein Research Scientist Hosam K. Fathy Kenneth R. Butts, Toyota Motor Engineering and Manufacturing, North America. [ bib | pdf ]
[2] Denise A. McKay. Stack Level Modeling and Validation of Low Temperature Fuel Cells and Systems for Active Water Management. PhD thesis, The University of Michigan, 2008. Thesis Advisors: Professors Nikolaos Katopodes and Anna Stefanopoulou. [ bib ]
[1] Jay Tawee Pukrushpan. Modeling and Control of Fuel Cell Systems and Fuel Processor Systems. PhD thesis, TheUniversity of Michigan, Co-Chairs: Anna Stefanopoulou and Huei Peng, Jan 2003. [ bib | pdf ]

Electromechanical Valve Actuator:

[11] Katherine S. Peterson and A.G.Anna G. Stefanopoulou. Extremum seeking control for soft landing of an electromechanical valve actuator. Automatica, 40(6):1063 - 1069, 2004. [ bib | DOI | pdf | http ]
[10] J.W.; Stefanopoulou A.G. Peterson, K.S.; Grizzle. Nonlinear magnetic levitation of automotive engine valves. In Third IFAC Symposium on Mechatronic Systems, pages 645-650, 2004. [ bib | pdf ]
[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, Dec. 2003. [ bib | DOI | pdf ]
[8] A. G.; Wang Y Peterson, K. S.; Stefanopoulou. 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] A. G.; Wang Y.; Megli T. Peterson, K. S.; Stefanopoulou. 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. 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 ]
[5] W.; Stefanopoulou. A. Peterson, K.S.; Hoffman. 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., Jul. 2002. [ bib | pdf ]
[4] A.G.; Wang Y.; Haghgooie M. Peterson, K.S.; Stefanopoulou. 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, Dec. 2002. [ bib | pdf ]
[3] A.; Peterson K.; Megli T.; Haghgooie M. Wang, Y.; Stefanopoulou. Modelling and control of electromechanical valve actuator. Technical Report 2002-01-1106, SAE, Mar. 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] A.; Haghgooie M.; Kolmanovsky I.; Hammoud M. Wang, Y.; Stefanopoulou. Modeling of an electromechanical valve actuator for a camless engine. In AVEC '2000: 5th International Symposium on Advanced Vehicle Control, number 93, Aug 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:

11. Adaptive MPC for braking assist, A. Vahidi, A. Stefanopoulou , submitted to IMECE 2004

10. Recursive Least Squares with Forgetting for Online Estimation of Vehicle Mass and Road Grade: Theory and Experiments, A. Vahidi, A. Stefanopoulou H. Peng, to appear Journal of Vehicle Dynamics (pdf )

9.    “Experiments for Online Estimation of Heavy Vehicle’s Mass and Time-Varying Road Grade,” A. Vahidi, A. Stefanopoulou H. Peng, Proceedings IMECE DSCD 2003_42807, Jan 2003 (pdf )

8.    “Speed Control Experiments for Heavy Duty Vehicle with Coordinated Friction and Engine Compression Brakes,” Maria Druzhinina, Anna Stefanopoulou, submitted to International Journal of Heavy Vehicle Systems, Nov 4, 2002.

7.    “Recursive Least Squares with Forgetting for Online Estimation of Vehicle Mass and Road Grade: Theory and Experiments,” Ardalan Vahidi, Anna Stefanopoulou, Huei Peng, submitted to Vehicle System Dynamics, Jan 16, 2003.

6. “Speed Control Experiments for Commercial Heavy Vehicles with Coordinated Friction and Engine Compression Brakes ,” M. Druzhinina, A. Stefanopoulou, in 2002 American Control Conference Proceedings, pp 2546-2551, May 2002.

5. “Adaptive Continuously Variable Compression Braking Control for Heavy-Duty Vehicles ,” Maria Druzhinina, Anna Stefanopoulou, Lasse Moklegaard, ASME Journal of Dynamic Systems, Measurement, and Control Vol 124, no.3, Sept 2002.

4. “Speed Gradient Approach to Longitudinal Control of Heavy-Duty Vehicles Equipped with Variable Compression Brake”, Maria Druzhinina, Anna Stefanopoulou, Lasse Moklegaard, IEEE Transactions on Control System Technology, Vol.10, no. 2, p. 209-221, March 2002 in pdf

3. “Brake Valve Timing and Fuel Injection: a Unified Engine Torque Actuator for Heavy-Duty Vehicles”, Lasse Moklegaard, Maria Druzhinina, Anna Stefanopoulou, Journal of Vehicle System Dynamics, vol 36, No 2-3, Sept 2001 in pdf

2. "Speed Gradient Approach to Longitudinal Control of Heavy -Duty Vehicles Equipped with Variable Compression Brake ," Maria Druzhinina ,  Lasse Moklegaard and Anna Stefanopoulou, Proceedings AVEC 2000.

1. "Brake Valve Timing and Fuel Injection: a Unified Engine Torque Actuator for Heavy-Duty Vehicles ," Lasse Moklegaard, Maria Druzhinina, Anna Stefanopoulou, Proceedings AVEC 2000.

Control of Turbocharged Diesel Engines:  

[14] O. F.; Stefanopoulou, A. G.; 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] A.; Smith R. Wang, Y.; Stefanopoulou. 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] I.V.; Moraal P.E.; Stefanopoulou A.; Jankovic M. van Nieuwstadt, M.J.; Kolmanovsky. 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] L.; Stefanopoulou A.G. Druzhinina, M.; Moklegaard. 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] A.G. Kolmanovsky, I.; Stefanopoulou. Evaluation of turbocharger power a assist system using optimal control techniques. Technical Report 2000-01-0519, SAE, 2000. [ bib | pdf ]
[8] A.G.; Schmidt J.H. Moklegaard, L.; Stefanopoulou. Transition from combustion to variable compression braking. Technical Report 2000-01-1228, SAE, 2000. [ bib | pdf ]
[7] ; Smith R. Stefanopoulou, A. Maneuverability and smoke emission constraints in marine diesel propulsion. Control Engineering Practice, 8(9):1023 - 1031, 2000. [ bib | DOI | pdf | http ]
[6] I.; Freudenberg J.S. Stefanopoulou, A.G.; Kolmanovsky. 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 ]
[5] A.; Smith R. Storset, O.F.; Stefanopoulou. 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] A.G.; Powell B.K. Kolmanovsky, I.; Stefanopoulous. 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] P.E.; Kolmanovsky I.V.; Stefanopoulou A.; Wood P.; Criddle M. van Nieuwstadt, M.; Moraal. 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] R. Stefanopoulou, A.G.; Smith. Emissions and performance tradeoffs for advanced marine diesel propulsion. In IFAC Workshop on Advances in Automotive Control, 1998. [ bib | pdf ]
[1] P.; van Nieuwstadt M.; Kolmanovsky, I.; Moraal 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:

1.    “Control of Charge Dilution in Turbocharged Diesel Engines via Exhaust Valve Timing ,” H. Yilmaz, A.G. Stefanopoulou, submitted to  Journal of Dynamic Systems, Measurement and Control, DS-03-1094, April 4, 2003 and short version in Proceedings American Control Conference 2003 (INV0401).

2. "Control-Oriented Model for Camless Intake Process (Part I)"  M.-S. S. Ashhab,  A. G. Stefanopoulou,   J. A. Cook,  M. B. Levin, Proc. 1999  IMECE, DSCD pp.  179-186, ASME Journal of Dynamic Systems, Measurement, and Control, Vol 122, pp. 122-130, March 2000 .

3. "Control of Camless Intake Process (Part II)"  M.-S. S. Ashhab,  A. G. Stefanopoulou,   J. A. Cook,  M. B. Levin, to appear Proc.  1999  IMECE, DSCD , pp. 187-194,  ASME Journal of Dynamic Systems, Measurement, and Control, Vol 122, pp. 131-139, March 2000.

4. "Idle Speed Control : An old problem in a new engine design,"  Yan Wang,  Anna Stefanopoulou,   Mike Levin,  Proc.  1999 American Control Conference, pp.  1217-1220, San Diego, CA.

5. "Multivariable Controller Structure in a Variable Cam Timing Engine with Electronic Throttle and Torque Feedback," S. C. Hsieh, J. S. Freudenberg, and A. G. Stefanopoulou,  Proc 1999, Conf. on Control Applications, pp. 465-470, Hawaii, HI.

6. ``Control-Oriented Model of a Dual Equal Variable Cam Timing Spark Ignition Engine,'' A.G. Stefanopoulou, J. A. Cook, J. S.Freudenberg, and J. W. Grizzle, ASME Journal of Dynamic Systems, Measurement, and Control, vol. 120, pp. 257-266, 1998

7. "Variable Camshaft Timing Engine Control," A.G. Stefanopoulou, J.S. Freudenberg and J.W. Grizzle, IEEE Transactions on Control System Technology, Vol.8, No.2, Jan.2000, pp.23-34 in pdf

8. "Joint Air-Fuel Ratio and Torque Regulation  using Secondary Cylinder Air Flow Actuators," A.G. Stefanopoulou, J.W. Grizzle and J.S. Freudenberg,  ASME Journal of Dynamic Systems, Measurement, and Control, Vol.121, No.4, Dec.1999, pp.638-647.

9. "Analysis and Control of Transient Torque Response in Engines with Internal Exhaust Gas Recirculation," A.G. Stefanopoulou and I. Kolmanovsky, IEEE Transactions on Control System Technology,   Vol.7, No.5, Sep.1999, pp.555-566.

10. ``Torque Management of Engines with Variable Cam Timing,'' M. Jankovic, F. Frischmuth, A. G. Stefanopoulou, and J. A. Cook, IEEE Control Systems Magazine, vol. 18, pp. 34-42, Oct. 1998.

11. ``Camless Engine Cotrol for Robust Unthrottled Operation,'' M. S. Ashhab, A. G. Stefanopoulou, J. A. Cook, and M. Levin, Society of Automotive Engineers Special Publication Series SP-1346, SAE #981031, Detroit, 1998.

12. "Emission and Drivability Tradeoffs in a Variable Cam Timing SI Engine with Electronic Throttle," S.C. Hsieh, A.G. Stefanopoulou, J.S. Freudenberg and K.R. Butts, Proc. 1997 American Control Conference, pp. 284-288.

13. "Dynamic Scheduling of Internal Exhaust Gas Recirculation Systems," A.G. Stefanopoulou and I. Kolmanovsky, Proc. IMECE 1997, Sixth ASME Symposium on Advanced Automotive Technologies, pp. 671-678.

14. "Modeling and Control of a Spark Ignition Engine with Variable Cam Timing," A.G. Stefanopoulou, J.S. Freudenberg, J.W. Grizzle, M. Haghgooie and P.S. Szpak, Proc. 1995 American Control Conference, pp. 2576-2581.

15. "Engine Air-Fuel Ratio and Torque Control Using Secondary Throttles," A.G. Stefanopoulou, J.W. Grizzle and J.S. Freudenberg, Proc, 1994 Conference on Decision and Control, pp. 2748-2753.

3. "Interpolation and Numerical Differentiation for Observer Design," S. Diop, J.W. Grizzle, P.E. Moraal and A. Stefanopoulou, Proc. 1994 American Control Conference, pp. 1329-1333.

2. "An Initial Assessment of Fuzzy Logic Vessel Path Control," M.G. Parsons, A.C. Chubb, Y. Cao and A.G. Stefanopoulou, Proc. 1994 IEEE Symposium on Autonomous Underwater Vehicles, pp. 225-232.

1. "Modeling and Control of Advanced Technology Engines, " A. G. Stefanopoulou, Ph.D. Thesis, University of Michigan, Feb. 1996.
   

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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