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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:

[1] Chia-Jui Chiang, A. G. Stefanopoulou, and M. Jankovic. Nonlinear observer-based control of load transitions in homogeneous charge compression ignition engines. IEEE Transactions Control System Technology, 15(3):438-448, May 2007. [ bib | DOI ]
[2] Chia-Jui Chiang and A. G. Stefanopoulou. Stability analysis in homogeneous charge compression ignition (hcci) engines with high dilution. IEEE Transactions Control System Technology, 15(2):209-219, March 2007. [ bib | DOI ]
[3] C. J. Chiang and A. G. Stefanopoulou. Dynamics of homogeneous charge compression ignition (hcci) engines with high dilution. In Proc. American Control Conference ACC '07, pages 2979-2984, 9-13 July 2007. [ bib | DOI ]
[4] 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, page 6pp., 14-16 June 2006. [ bib | DOI ]
[5] C. J. Chiang and A. G. Stefanopoulou. Control of thermal ignition in gasoline engines. In Proc. American Control Conference the 2005, pages 3847-3852, 8-10 June 2005. [ bib | DOI ]
[6] 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 Proc. American Control Conference the 2004, volume 1, pages 125-131, 30 June-2 July 2004. [ bib ]
[7] C. J. Chiang and A. G. Stefanopoulou. Steady-state multiplicity and stability of thermal equilibria in homogeneous charge compression ignition (hcci) engines. In Proc. CDC Decision and Control 43rd IEEE Conference on, volume 2, pages 1676-1681, 14-17 Dec. 2004. [ bib ]

Hybrid Battery Power: Estimation and Control:

[1] D. Di Domenico, G. 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 2008, pages 702-707, 3-5 Sept. 2008. [ bib | DOI ]
[2] 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 ]
[3] 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 ]
[4] O. Sundstrom and A. Stefanopoulou. Optimal power split in fuel cell hybrid electric vehicle with different battery sizes, drive cycles, and objectives. In Proc. IEEE International Symposium on Intelligent Control, pages 1681-1688, 4-6 Oct. 2006. [ bib | DOI ]

Fuel Cells:

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

[1] 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 ]
[2] 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 ]
[3] 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 ]
[4] 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 ]
[5] 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 ]
[6] 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 ]
[7] Eric Mueller, Florian A. Kolb, Anna G. Stefanopoulou, Denise A. McKay, and Lino Guzzella. Correlating nitrogen accumulation with temporal fuel cell performance. In Proc. of Dynamic Systems and Control Conference (DSCC08), , Paper TuAT5.1, 2008. [ bib ]
[8] 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 ]
[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 | http ]
[10] 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 ]
[11] 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] 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 ]
[13] 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 ]
[14] 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 ]
[15] 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 | pdf | http ]
[16] 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 ]
[17] 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 ]
[18] 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 ]
[19] 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 | http ]
[20] 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 ]
[21] 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 ]
[22] 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 ]
[23] 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 ]
[24] 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 ]
[25] 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 ]
[26] 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 ]
[27] 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 ]
[28] 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, 30 June-2 July 2004. [ bib ]
[29] 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, 30 June-2 July 2004. [ bib ]
[30] 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 ]
[31] 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, 4-6 June 2003. [ bib | DOI ]
[32] 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 ]
[33] 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, 4-6 June 2003. [ bib | DOI ]
[34] 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, 8-10 May 2002. [ bib | DOI ]
19. “Analysis, Modeling, and Validation for the Thermal Dynamics of a Polymer Electrolyte Membrane Fuel Cell Sytems,” E. A. Muller, A. G. Stefanopoulou, ASME Journal of Fuel Cell Science and Technology, accepted. also in  Proceedings of the ASME 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL2005-74050, May 2005

18. “Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System for Shipboard Applications” V. Tsourapas, A. G. Stefanopoulou, J. Sun, in Proceedings American Control Conference, ThA08.1, June 2005

17. “Model based detection of hydrogen leaks in a fuel cell stack,” A. Ingimundarson, A. G. Stefanopoulou, D. McKay, Proceedings of the 44th IEEE Conference on Decision and Control, Dec. 2005, Seville, Spain

16. “Constraint Management in Fuel Cells: A Fast Reference Governor Approach,” A. Vahidi, I. V. Kolmanovsky, A. G. Stefanopoulou, in Proceedings American Control Conference, FrA14.4 , June 2005

15. “Modeling, Parameter Identification, and Validation of Water Dynamics for a Fuel Cell Stack,” W. T. Ott, D. A. McKay, A.G. Stefanopoulou, Proceedings of 2005 ASME International Mechanical Engineering Congress & Exposition, Nov 05, IMECE 2005-81484.

14. Control of Fuel Cell Power Systems: Principles, Modeling, Analysis and Feedback Design, Series : Advances in Industrial Control , 2004, XVII, 161 p. 111 illus., Hardcover, ISBN: 1-85233-816-4

13. "Mechatronics in Fuel Cell Systems", Anna G. Stefanopoulou, (Pleanary talk via request and paper) in Proceedings of the International Federation of Control, Symposium in Mechatronics, Sydney, Sept 2004.

12. “Modeling and Dynamics of a Fuel Cell Combined Heat Power System for Marine Applications,” Vasilis Tsourapas, Jing Sun, Anna Stefanopoulou, IASME Transactions, 2(1), pp.288-293, April 2004 (pdf).< o:p>

11. "Fuel Cell APU for Silent Watch and Mild Electrification of a Medium Tactical Truck", Zoran Filipi, Loucas Louca, Anna Stefanopoulou, Jay Pukrushpan, Burit Kittirungsi and Huei Peng, SAE 2004-01-1477 (pdf presentation)

10. "Parameterization and Validation of a Lumped Parameter Diffusion Model for Fuel Cell Stack Membrane Humidity
Estimation" (pdf ) Denise McKay, Anna Stefanopoulou, in IEEE Proceedings of 2004 American Control Conference, 2004.

9. “Model Predictive Control for Starvation Prevention in a Hybrid Fuel Cell System,” (pdf ) A. Vahidi, A.G. Stefanopoulou, and H. Peng, in IEEE Proceedings of 2004 American Control Conference, 2004.

8.    “Controlling Fuel Cell Breathing ,” J.T. Pukrushpan, A.G. Stefanopoulou, H. Peng, in Control Systems Magazine, IEEE Control Systems Magazine, 24(2) pp30-46, April, 2004

7. “Simulation and Analysis of Transient Fuel Cell System Performance based on a dynamic reactant flow model ,” Jay Pukrushpan, Anna Stefanopoulou, Huei Peng in the 2002 IMECE conference and a longer journal version in  “Modeling and Analysis of Fuel Cell Reactant Flow for Automotive Applications,” J.T. Pukrushpan, H. Peng, A.G. Stefanopoulou, in Journal of Dynamic Systems, Measurement and Control, 126 (1),  pp. 14-25, March 2004.

6.    “Dynamics and Control of Low and High Pressure Fuel Cells ,” S. Gelfi, J. Pukrushpan, A.G. Stefanopoulou, H. Peng, in IEEE, American Control Conference 2003

5.    “Control of Natural Gas Catalytic Partial Oxidation for Hydrogen Generation in Fuel Cell Aplications,” J.T. Pukrushpan, A.G. Stefanopoulou, H. Peng, in IEEE American Control Conference 2003 (pdf ) and in IEEE Transactions on Control Systems Technology (pdf )v 13, n 1, p 3-14, January, 2005.

4.    “ Control-Oriented Model of Fuel Processor for Hydrogen Generation in Fuel Cell Applications,” Jay Pukrushpan, Anna Stefanopoulou, Subbarao Varigonda, in IFAC Symposium in Adavnces in Automotive Systems, Salerno, 2004 (pdf ) and to appear in IFAC, Control Engineering Practice, 2005 (pdf)

3.    “Challenges in Fuel Cell Power Plant Control: The Role of System Level Models,” S. Varigonda, J. Pukrushpan, A. G. Stefanopoulou, in 2003 AIChE Spring Meeting (pdf ).

2. "Modeling and Control of Fuel Cell Systems and Fuel Processor Systems," Jay Tawee Pukrushpan, PhD Thesis , Jan 2003, Co-Chairs: Anna Stefanopoulou and Huei Peng

1. "Modeling and Control of Fuel Cell PEM Stack Systems ," in Proceedings of 2002 American Control Conference, pp. 3117-3122, Anchorage, AK

Electromechanical Valve Actuator:
 
11. “Nonlinear Magnetic Levitation of Automotive Engine Valves,” K.S. Peterson, J.W. Grizzle, A.G. Stefanopoulou, 3rd Symposium on Mechatronic Systems, pp 645-650, 2004  (best student paper award)< o:p>

10. “Virtual Lash Adjuster for an Electromechanical Valve Actuator through Iterative Learning Control ,” K. S. Peterson, A. G. Stefanopoulou, Y. Wang, T. Megli, Proceedings IMECE DSCD 2003-41270.

9.    “Rendering the Elecreomechanical Valve Actuator Globally Asymptotically Stable ,” K.S. Peterson, A. G. Stefanopoulou, in 2003 Conference on Decision and Control, March 2003.

8.    “Extremum Seeking Control for Soft Landing of an Electromechanical Valve Actuator ,” K. S. Peterson, A. G. Stefanopoulou, to appear Automatica, xx xx, 200x

7.    “Control of Electromechanical Actuators: Valves Tapping in Rhythm ”, Kathy Peterson, Yan Wang, Anna Stefanopoulou,  in Multidisciplinary Research in Control: The Mohammed Dahleh Symposium 2002. Eds. L. Giarre' and B. Bamieh, Lecture Notes in Control and Information Sciences N. 289, Springer-Verlag, Berlin, 2003,  ISBN 3-540-00917-5

6.     “Nonlinear Self-Tuning Control for Soft Landing of an Electromechanical Valve Actuator ”, K. Peterson, A. Stefanopoulou , Proceedings of IFAC Mechatronics Conference, Nov 2002

5.    “Experimental Results and Implementation Issues of an Iterative Learning Controller for Soft Landing of an Electromechanical Valve Actuator ”, Kathy Peterson, Wolfgang Hoffmann, Anna Stefanopoulou, Proceedings of 2002 Mediterranean Conference

4. "Output Observer Based Feedback for Soft Landing of Electromechanical Camless Valvetrain Actuator ," in Proceedings of 2002 American Control Conference, pp. 1413-1418, May 2002 

3."Modeling and Control of Electromechanical Valve Actuator," Y. Wang, A. Stefanopoulou, K. Peterson, T.Megli, M.Haghgooie, SAE 2002-01-1106 .

2.``Iterative Learning Control of Electromechanical Camless Valve Actuator ,'' W. Hoffmann, A. Stefanopoulou,  IEEE Transactions on Control System Technology, Vol 11, no.2, p. 174-184, March 2003.

1. "Modeling of an Electromechanical Valve Actuator for a Camless Engine," Yan Wang, Anna Stefanopoulou,
Mohammad Haghgooie, Ilya Kolmanovsky, Mazen Hammoud, Proceedings 5th Int'l Symposium on Advanced Vehicle Control, no. 93, Aug 2000.

Control Architectures: Analysis and Design

1. “Effects of Control Structure on Performance for an Automotive Powertrain with Continuously Variable Transmission ,” Sharon Liu, Anna Stefanopoulou in IEEE Transactions on Control System Technology, vol. 10, no. 5, 701-9, Sept. 2002

2. “Control Techniques for Assessing Feasibility and Defining Subsystem Level Requirements: An Automotive Case Study ”, I. Kolmanovsky and A. G. Stefanopoulou, IEEE Transactions on Control System Technology, Vol.9, no.3, p.524-34, May 2001.

3. "Automotive Powertrain Control for Modular Controller Architectures: A Case Study," A.G. Stefanopoulou, K.R. Butts, J.A. Cook, J.S. Freudenberg and J.W. Grizzle, Proc. 1995 Conference on Decision and Control, pp. 768-773.


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. “Pressure and Temperature based Adaptive Observer of Air Charge for Turbocharged Diesel Engines” , Anna Stefanopoulou , Ove Storset, Roy Smith, International Journal of Robust and Nonlinear Control, Vol 14, no 6, pp 543-560, April 2004.

13.   “Adaptive Air Charge Estimation for Turbocharged Diesel Engines ”, O. Storset, A. Stefanopoulou, R. Smith, ASME Journal of Dynamic Systems Measurements and Control, June 2004.

12. " EGR-VGT Control Schemes: Experimental Comparison for a High-Speed Diesel Engine ." M. J. van Nieuwstadt, I.V. Kolmanovsky, P.E. Moraal, A, G. Stefanopoulou, M. Jankovic, Control System Magazine, Vol 20, no. 3, pp 63-79, June 2000.

11. "Air Charge Estimation for Turbocharged Diesel Engines ," O. Storset, A. Stefanopoulou, R. Smith, Proceedings ACC 2000.

10. "Compression Braking Control for Heavy-Duty Vehicles ," M. Druzhinina, L. Moklegaard, A. Stefanopoulou, Proceedings 2000 ACC.

9. "Transition from Combustion to Variable Compression Braking ",  L. Moklegaard, A. G. Stefanopoulou, J. Schmidt, SAE 2000-01-1228.

8. "Evaluation of Turbocharger Power a Assist System Using Optimal Control Techniques ",   Ilya Kolmanovsky and Anna Stefanopoulou, SAE 2000-01-0519.

7.    “Maneuverability and Smoke Constraints in Marine Diesel Propulsion”, A. G. Stefanopoulou and R. Smith, IFAC Journal of Control Engineering Practice, vol.8, no.9; Sept. 2000; p.1023-31in pdf .

6. “Inherent Limitations and Control Design for Camless Engine Idle Speed Dynamics'', Yan Wang, Anna Stefanopoulou, Roy Smith, IFAC Journal of Robust Nonlinear Optimal Control, vol.11, no.11; Sept. 2001; p.1023-42 in pdf

5. " Improving Turbocharged Diesel Engine Operation with Turbo Power Assist System," I. Kolmanovsky, A. G. Stefanopoulou, and B. K. Powell, Proc 1999, Conf. on Control Applications,   pp. 454-459, Hawaii, HI.

4. "Control of Variable Geometry Turbocharged Diesel Engines for Reduced Emissions," A. G. Stefanopoulou, I. Kolmanovsky, J. S. Freudenberg, ACC 1998 .  pp. 1383-1388 and to appear, IEEE Transactions on Control System Technology in pdf

3. ``Emissions and Performance Tradeoffs for Advanced Marine Diesel Propulsion,'' A. G. Stefanopoulou and R. Smith, IFAC Conf. in Marine Systems, pp. 39-44, Fukuoka, Japan, 1998

2. "A Comparison of SISO and MIMO Designs for EGR-VNT Control of High Speed Diesel Engines," M. van Nieustandt, P.E. Moraal, I.V. Kolmanovsky and A.G. Stefanopoulou, IFAC Workshop on Advances in Automotive Control.

1. "Issues in Modeling and Control of Intake Flow in Variable Geometry Turbocharged Engines," I.V. Kolmanovsky, A.G. Stefanopoulou, P.E. Moraal and M. van Nieustandt, in 18th IFIP Conference on System Modelling and Optimization.

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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