VVT_papers.bib

@conference{Ashhab1998,
  title = {Camless Engine Control for Robust Unthrottled Operation},
  author = {M. S. Ashhab and A. G. Stefanopoulou and J. A. Cook and M. Levin},
  booktitle = {Society of Automotive Engineers Special Publication Series SP-1346 SAE981031},
  year = {1998},
  doi = {10.4271/981031},
  file = {papers_VVT/sae98.pdf},
  owner = {Admin},
  timestamp = {2009.12.09}
}

@inproceedings{Ashhab1999,
  author = {M.-S. S. Ashhab and A. G. Stefanopoulou and J. A. Cook and M. B. Levin},
  title = {Control-Oriented Model for Camless Intake Process Part I},
  booktitle = {Proceedings of International Mechanical Engineering Congress \& Exposition (!MECE), Dynamic Systems \& Control Division (DSCD)},
  year = {1999},
  pages = {179-186},
  doi = {10.1115/1.482447},
  file = {papers_VVT/imece_mod.pdf},
  owner = {Admin},
  timestamp = {2009.12.08}
}

@inproceedings{Ashhab1999a,
  author = {M.-S. S. Ashhab and A. G. Stefanopoulou and J. A. Cook and M. B. Levin},
  title = {Control of Camless Intake Process - Part II},
  booktitle = {Proceedings of International Mechanical Engineering Congress \& Exposition (!MECE), Dynamic Systems \& Control Division (DSCD)},
  year = {1999},
  pages = {187-194},
  file = {papers_VVT/imece_con.pdf},
  owner = {Admin},
  timestamp = {2009.12.08}
}

@article{Ashhab2000,
  title = {Control-Oriented Model for Camless Intake Process---Part I},
  author = {M.-S. S. Ashhab and A. G. Stefanopoulou and J. A. Cook and M. B. Levin},
  journal = {Journal of Dynamic Systems, Measurement, and Control},
  year = {2000},
  number = {1},
  pages = {122-130},
  volume = {122},
  doi = {10.1115/1.482447},
  file = {papers_VVT/rv2jmod.pdf},
  keywords = {internal combustion engines; control systems; controllers; actuators; valves; fuel optimal control},
  publisher = {ASME},
  url = {http://link.aip.org/link/?JDS/122/122/1}
}

@article{Ashhab2000a,
  title = {Control of Camless Intake Process - Part II},
  author = {M.-S. S. Ashhab and A. G. Stefanopoulou and J. A. Cook and M. B. Levin},
  journal = {Journal of Dynamic Systems, Measurement, and Control},
  year = {2000},
  number = {1},
  pages = {131-139},
  volume = {122},
  doi = {10.1115/1.482448},
  file = {papers_VVT/rv2jcon.pdf},
  keywords = {internal combustion engines; robust control; control systems; controllers; valves; adaptive control; fuel optimal control; feedback; feedforward; actuators},
  publisher = {ASME},
  url = {http://link.aip.org/link/?JDS/122/131/1}
}

@inproceedings{Chiang2006,
  title = {Nonlinear Control of Transitions Between Thermal Equilibria in Homogeneous Charge Compression Ignition (HCCI) Engines},
  author = {Chia-Jui Chiang and Anna G. Stefanopoulou and Mrdjan Janković},
  booktitle = {In Proceedings of AVEC '06 : 8th International Symposium on Advanced Vehicle Control},
  year = {2006},
  owner = {choonhun},
  timestamp = {2015.03.02}
}

@inproceedings{Guardiola2016,
  author = {C. Guardiola and V. Triantopoulos and P. Bares and S. Bohac and A. Stefanopoulou},
  title = {Simultaneous Estimation of Intake and Residual Mass Using In-Cylinder Pressure in an Engine with Negative Valve Overlap},
  booktitle = {8th IFAC Symposium on Advances in Automotive Control},
  year = {2016},
  doi = {10.1016/j.ifacol.2016.08.068},
  file = {papers_VVT/Guardiola2016IFAC.pdf}
}

@inproceedings{Hoffmann2001,
  author = {Hoffmann, W. and Stefanopoulou, A.G.},
  title = {Iterative learning control of electromechanical camless valve actuator},
  booktitle = {American Control Conference, 2001. Proceedings of the 2001},
  year = {2001},
  volume = {4},
  pages = {2860-2866},
  abstract = {In this paper we consider the control of the valve trajectory in a gasoline engine equipped with an electromechanical camless valvetrain (EMCV) actuator. Precise control of the voltage applied to the coils is required to avoid high contact velocities during valve closing and opening, i.e., to ensure soft landing. In our previous work we designed a tracking controller that consists of a constant preset voltage augmented by a voltage command based on a linear feedback and modified by an Iterative Learning Controller (ILC). The new results reported here involve the preset voltage in the learning process. This yields good results in the presence of unknown gas flow forces through the valves. As a consequence, a non-square learning algorithm is used to calculate more input values than available error values. We demonstrate the closed loop performance through simulations with an unknown acting gas flow force that emulates a realistic varying engine load},
  doi = {10.1109/ACC.2001.946333},
  file = {papers_EVA/IEEE_ILC.pdf},
  keywords = {intelligent actuators, intelligent control, internal combustion engines, learning (artificial intelligence), valvesIterative Learning Controller, closed loop performance, electromechanical camless valvetrain actuator, engine load, gasoline engine, learning control, valve trajectory, valve trajectory control},
  owner = {choonhun},
  timestamp = {2015.01.27}
}

@article{Hoffmann2003,
  author = {Hoffmann, W. and Peterson, K. and Stefanopoulou, A.},
  title = {Iterative Learning Control for Soft Landing of Electromechanical Valve Actuator in Camless Engines},
  journal = {IEEE Transactions on Control System Technology},
  year = {2003},
  volume = {11},
  number = {2},
  pages = {174-184},
  month = {March},
  doi = {10.1109/TCST.2003.809242},
  file = {papers/iterativelearningcontrolforsoft.pdf},
  owner = {choonhun},
  timestamp = {2015.02.27}
}

@inproceedings{Hsieh1997,
  title = {Emission and drivability tradeoffs in a variable cam timing SI engine with electronic throttle},
  author = {Hsieh, S.C. and Stefanopoulou, A.G. and Freudenberg, J.S. and Butts, K.R.},
  booktitle = {American Control Conference, 1997. Proceedings of the 1997},
  year = {1997},
  month = {June},
  pages = {284-288 vol.1},
  volume = {1},
  abstract = {Tradeoffs between low feedgas emissions and smooth brake torque are discussed in the context of an engine equipped with variable camshaft timing (VCT). The use of VCT lowers the generation of feedgas emissions but adversely affects the torque response. However, with the addition of an electronic throttle and knowledge of online torque, the tradeoffs between emissions and drivability in the VCT engine can be lessened; conventional (nonVCT) engine torque response can be achieved while simultaneously preserving most of the emissions benefits gained by using VCT},
  doi = {10.1109/ACC.1997.611802},
  file = {papers_VVT/acc97.pdf},
  keywords = {air pollution control, internal combustion enginesVCT, drivability, electronic throttle, feedgas emissions, smooth brake torque, spark ignition engine, variable cam timing SI engine, variable camshaft timing}
}

@inproceedings{Hsieh1999,
  title = {Multivariable controller structure in a variable cam timing engine with electronic throttle and torque feedback},
  author = {Hsieh, S.C. and Freudenberg, J.S. and Stefanopoulou, A.G.},
  booktitle = {Proceedings of the 1999 IEEE International Conference on Control Applications},
  year = {1999},
  pages = {465-470 vol. 1},
  volume = {1},
  abstract = {By adding an electronic throttle and a torque sensor to an engine equipped with variable cam timing (VCT), it is potentially possible to vary cam phasing to improve emissions and fuel economy while preserving the torque response of a conventional non-VCT engine. To do so effectively, however, requires the use of multivariable control. A controller consisting of decentralized individual control loops will not yield satisfactory performance because such a controller cannot compensate for system interactions. Yet, a fully multivariable controller may not prove necessary in order to achieve the desired performance. In this paper, we design linear multivariable controllers at a number of operating points and simplify the resulting controllers by eliminating cross-coupling terms that do not affect the closed loop response. Doing so provides insight useful in tuning controller parameters},
  doi = {10.1109/CCA.1999.806683},
  file = {papers_VVT/PM-05-5.pdf},
  keywords = {feedback, internal combustion engines, multivariable control systems, torque controlcam phasing, closed loop response, controller parameter tuning, conventional non-VCT engine, cross-coupling term elimination, electronic throttle, emissions economy, fuel economy, linear multivariable controller design, multivariable controller structure, system interaction compensation, torque feedback, torque response, variable cam timing engine}
}

@article{Jankovic1998,
  author = {Jankovic, M. and Frischmuth, F. and Stefanopoulou, A. and Cook, J.A.},
  title = {Torque management of engines with variable cam timing},
  journal = {Control Systems Magazine, IEEE},
  year = {1998},
  volume = {18},
  number = {5},
  pages = {34-42},
  month = {October},
  abstract = {This paper describe the variable cam timing (VCT) system which addresses both the drivability and emission performance by utilising an electric hydraulic mechanism to rotate the camshaft relative to the crankshaft in order to retard the cam timing with respect to the intake and exhaust strokes of the engine. By retarding the exhaust valve closing further into the intake stroke, more exhaust gas is drawn into the cylinder providing internal exhaust gas recirculation. In this manner, the amount of residual gas trapped in the cylinder at the end of the exhaust stroke is controlled by cam timing, suppressing NOx formation and reducing the pumping losses. Furthermore, this residual contains some unburned hydrocarbons; consequently, retaining it in the cylinder through two combustion cycles also reduces hydrocarbon emissions. In addition to the reduction of NOx and HC emissions, variable cam timing permits the engine designer to optimize cam timing over a wide range of engine operating conditions},
  doi = {10.1109/37.722251},
  file = {papers/torquemanagementofengines.pdf},
  issn = {0272-1708},
  keywords = {automobiles, combustion, compensation, internal combustion engines, timing, torque controlNOx emissions, automotive engines, cam timing, camshaft, combustion cycles, crankshaft, exhaust gas, hydrocarbon emissions, intake stroke, throttle compensator, torque management, variable cam timing}
}

@inproceedings{Jiang2009,
  author = {Jiang, L. and Vanier, J. and Yilmaz, H. and Stefanopoulou, A.},
  title = {Parameterization and Simulation for a Turbocharged Spark Ignition Direct Injection Engine with Variable Valve Timing},
  booktitle = {SAE Technical Paper 2009-01-0680},
  year = {2009},
  doi = {10.4271/2009-01-0680},
  file = {papers/parameterizationandsimulationforturbo.pdf},
  owner = {choonhun},
  timestamp = {2015.03.04}
}

@inproceedings{Lee2010,
  author = {D. Lee and L. Jiang and H. Yilmaz and A. G. Stefanopoulou},
  title = {Preliminary Results on Optimal Variable Valve Timing and Spark Timing Control via Extremum Seeking},
  booktitle = {DSCC 2010},
  year = {2010}
}

@article{Liu2002,
  title = {Effects of control structure on performance for an automotive powertrain with a continuously variable transmission},
  author = {Liu, S. and Stefanopoulou, A.G.},
  journal = {Control Systems Technology, IEEE Transactions on},
  year = {2002},
  month = {September},
  number = {5},
  pages = {701-708},
  volume = {10},
  doi = {10.1109/TCST.2002.801881},
  file = {papers_Control_Architectures/IEEE_CVT.pdf},
  issn = {1063-6536},
  keywords = {MIMO systems, automobiles, internal combustion engines, multivariable control systems, transfer functions, velocity controlautomotive powertrain, continuously variable transmission, electronic throttle, multivariable strategy, nonminimum phase zero, single-input-two-output system, spark-ignition engine, transfer function, two-input-two-output control structure, wheel speed control},
  owner = {choonhun},
  timestamp = {2015.01.27}
}

@inproceedings{Peterson2002,
  title = {Nonlinear Self-Tuning Control for Soft Landing of an Electromechanical Valve Actuator},
  author = {Peterson, K.S. and Stefanopoulou, A.G. and Wang, Y. and Haghgooie, M.},
  booktitle = {Mechatronic Systems 2002: A Proceedings Volume from the 2nd IFAC Conference},
  year = {2002},
  pages = {191-196},
  file = {papers_EVA/mech2002_G1_102.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@inproceedings{Peterson2002a,
  title = {Output observer based feedback for soft landing of electromechanical camless valvetrain actuator},
  author = {Peterson, K. and Stefanopoulou, A. and Megli, T. and Haghgooie, M.},
  booktitle = {American Control Conference, 2002. Proceedings of the 2002},
  year = {2002},
  pages = {1413-1418},
  volume = {2},
  abstract = {Electromechanical valvetrain (EMV) actuators can replace the camshaft allowing for electronically controlled variable valve timing (VVT) on a new generation of engines. Before EMV actuators can be used in production vehicles two critical problems need to be resolved. First, impact velocities between the valve, valve seat, and the actuator itself need to be small to avoid excessive wear on the system and ensure acceptable levels of noise. Second, the opening and closing of the valve needs to be both fast and consistent to avoid collision with the piston and to reduce variability in trapped mass. This paper presents an observer based output feedback controller designed to achieve these goals. Theoretical analysis and experimental results of the controller are provided. The experimental results show a factor of six reduction in impact velocity and consistent and quick valve timing.},
  doi = {10.1109/ACC.2002.1023219},
  file = {papers_EVA/acc2002emcv.pdf},
  issn = {0743-1619 },
  keywords = { electric actuators, feedback, internal combustion engines, noise, observers EMV actuators, VVT, automotive powertrain, collision avoidance, electromechanical camless valvetrain actuator, electronically controlled variable valve timing, impact velocities, observer based output feedback controller, output observer based feedback, piston, soft landing, valve closing, valve opening, valve timing, vehicle engines},
  owner = {choonhun},
  timestamp = {2015.01.27}
}

@inproceedings{Peterson2002b,
  author = {Peterson, K.S. and Hoffman, W. and Stefanopoulou, A.},
  title = {Experimental Results and Implementation Issues of an Iterative Learning Controller for Soft Landing of an Electromechanical Valve Actuator},
  booktitle = {Proceedings of the 10th Mediterranean Conference on Control and Automation - MED2002, Lisbon, Portugal, July 9-12, 2002.},
  year = {2002},
  file = {papers/experimentalresultsandimplementationissues.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@inproceedings{Peterson2003,
  title = {Virtual Lash Adjuster for an Electromechanical Valve Actuator through Iterative Learning Control},
  author = {Peterson, K. S. and Stefanopoulou, A. G. and Wang, Y. and Megli, T.},
  booktitle = {Proceedings of ASME International Mechanical Engineering Congress and Exposition (IMECE2003)},
  year = {2003},
  pages = {295-301},
  publisher = {ASME},
  doi = {10.1115/IMECE2003-41270},
  file = {papers_EVA/IMECE2003-41270.pdf},
  owner = {Admin},
  timestamp = {2009.10.30},
  url = {http://link.aip.org/link/abstract/ASMECP/v2003/i37130/p295/s1}
}

@inproceedings{Peterson2003a,
  title = {Rendering the electromechanical valve actuator globally asymptotically stable},
  author = {Peterson, K.S. and Stefanopoulou, A.G.},
  booktitle = {Decision and Control, 2003. Proceedings. 42nd IEEE Conference on},
  year = {2003},
  pages = {1753-1758},
  volume = {2},
  abstract = {This paper presents a nonlinear controller based on Sontag's feedback to render the electromechanical valve actuator (EVA) globally asymptotically stable (GAS). Electromechanical valve actuators have received much attention recently due to their potential for improving the performance of the internal combustion engine. Various control schemes for the EVA have been proposed, however stability is often neglected due to the bounded motion of the EVA or proven based on a linearized plant model. Here, we demonstrate and prove that our controller renders the system GAS without any assumption of linearity.},
  doi = {10.1109/CDC.2003.1272866},
  file = {papers_EVA/cdc18.pdf},
  issn = {0191-2216 },
  keywords = { asymptotic stability, electromagnetic actuators, internal combustion engines, nonlinear control systems electromechanical valve actuator, globally asymptotically stable, internal combustion engine, nonlinear controller},
  owner = {choonhun},
  timestamp = {2015.01.27}
}

@incollection{Peterson2003b,
  title = {Control of Electromechanical Actuators: Valves Tapping in Rhythm},
  author = {Peterson, K. S. and Stefanopoulou, A. G. and Wang, Y},
  booktitle = {Multidisciplinary Research in Control, The Mohammed Dahleh Symposium 2002},
  publisher = {Springer-Verlag},
  year = {2003},
  editor = {L. Giarre' and B. Bamieh},
  note = {ISBN 3-540-00917-5},
  series = {Lecture Notes in Control and Information Sciences},
  volume = {289},
  doi = {10.1007/3-540-36589-3_14},
  file = {EVA_PDF/book13.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@article{Peterson2004,
  title = {Extremum seeking control for soft landing of an electromechanical valve actuator},
  author = {Katherine S. Peterson and Anna G. Stefanopoulou},
  journal = {Automatica},
  year = {2004},
  number = {6},
  pages = {1063 - 1069},
  volume = {40},
  doi = {10.1016/j.automatica.2004.01.027},
  file = {papers_EVA/Automatica_04.pdf},
  issn = {0005-1098},
  keywords = {Electromagnetic devices},
  owner = {choonhun},
  timestamp = {2015.01.27},
  url = {http://www.sciencedirect.com/science/article/B6V21-4C1F9XM-2/2/2f4cc30a0edc08961932983f8a649406}
}

@inproceedings{Peterson2004a,
  author = {Peterson, K.S. and Grizzle, J.W. and Stefanopoulou, A.G.},
  title = {Nonlinear Magnetic Levitation of Automotive Engine Valves},
  booktitle = {Third IFAC Symposium on Mechatronic Systems},
  year = {2004},
  pages = {645-650},
  file = {papers/nonlinearmagneticlevitation.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@conference{Peterson2005,
  author = {Peterson, L.S. and Stefanopoulou, A.G. and Freudenberg, J.},
  title = {Current versus flux in the control of electromechanical valve actuators},
  booktitle = {Proceedings of the 2005 American Control Conference},
  year = {2005},
  volume = {7},
  pages = {5021-5026},
  doi = {10.1109/ACC.2005.1470806},
  file = {papers/currentversusflux.pdf},
  owner = {choonhun},
  timestamp = {2015.03.02}
}

@article{Peterson2006,
  author = {K. S. Peterson and J. W. Grizzle and A. G. Stefanopoulou},
  title = {Nonlinear Control for Magnetic Levitation of Automotive Engine Valves},
  journal = {IEEE Transactions on Control Systems Technology},
  year = {2006},
  volume = {14},
  number = {2},
  pages = {346-354},
  doi = {10.1109/TCST.2005.863669},
  file = {papers/nonlinearcontrolformagneticlevitation.pdf},
  owner = {choonhun},
  timestamp = {2015.02.27}
}

@inproceedings{Stefanopoulou1994,
  title = {Engine air-fuel ratio and torque control using secondary throttles },
  author = {Stefanopoulou, A.G. and Grizzle, J.W. and Freudenberg, J.S.},
  booktitle = {Decision and Control, 1994., Proceedings of the 33rd IEEE Conference on},
  year = {1994},
  month = {December},
  pages = {2748-2753 vol.3},
  volume = {3},
  abstract = {A control scheme is designed to limit air-fuel ratio excursions and track driver-demanded torque for a 4-cylinder engine during rapid changes in throttle position. The new control scheme is based on joint management of air and fuel flow into the cylinders using secondary throttles placed before the intake ports of the cylinders, in combination with standard fuel injectors},
  doi = {10.1109/CDC.1994.411385},
  file = {papers_VVT0/cdc94.pdf},
  keywords = { automobiles, internal combustion engines, torque control 4-cylinder engine, air flow management, air-fuel ratio excursion limitation, driver-demanded torque tracking, engine air-fuel ratio, fuel flow management, secondary throttles, standard fuel injectors, throttle position changes, torque control}
}

@inproceedings{Stefanopoulou1995,
  title = {Modeling and control of a spark ignition engine with variable cam timing},
  author = {Stefanopoulou, A.G. and Cook, J.A. and Freudenberg, J.S. and Grizzle, J.W. and Haghgooie, M. and Szpak, P.S.},
  booktitle = {Proceedings of the American Control Conference, 1995},
  year = {1995},
  month = {June},
  pages = {2576-2581},
  volume = {4},
  abstract = {A control scheme is designed to minimize emissions and respond to rapid throttle changes in a fuel injected, spark ignition engine equipped with variable cam timing. The model is derived from engine mapping data for an eight cylinder experimental engine mounted in a dynamometer test cell; it is fundamentally a nonlinear and multivariable model. The control scheme jointly manages fuel and cam position},
  doi = {10.1109/ACC.1995.532313},
  file = {papers_VVT/acc95.pdf},
  keywords = { automobiles, automotive electronics, electric ignition, internal combustion engines, mechanical engineering, timing cam position control, dynamometer test cell, emissions regulation, engine mapping, fuel control, modeling, multivariable model, nonlinear model, spark ignition engine, variable cam timing}
}

@inproceedings{Stefanopoulou1995a,
  title = {Consequences of modular controller development for automotive powertrains: a case study},
  author = {Stefanopoulou, A.G. and Butts, K.R. and Cook, J.A. and Freudenberg, J.S. and Grizzle, J.W.},
  booktitle = {Decision and Control, 1995., Proceedings of the 34th IEEE Conference on},
  year = {1995},
  month = {December},
  pages = {768-773},
  volume = {1},
  doi = {10.1109/CDC.1995.479073},
  file = {papers_Control_Architectures/cdc95.pdf},
  keywords = {automobiles, control engineering, decentralised control, feedback, interconnected systems, internal combustion engines, multivariable control systemsautomotive powertrains, calibration, complexity, coordinated multivariable feedback, decentralized controller, engineering design, highly interactive subsystems, modular controller development, modular controller structure, module reuse, module sharing, obsolete feature removal, spark ignition engine, subsystem interaction, variable camshaft timing},
  owner = {choonhun},
  timestamp = {2015.01.27}
}

@inproceedings{Stefanopoulou1995b,
  author = {A. G. Stefanopoulou and K. R. Butts and J. A. Cook and J. S. Freudenberg and J. W. Grizzle},
  title = {Automotive Powertrain Control for Modular Controller Architectures: A Case Study},
  booktitle = {1995 Conference on Decision and Control},
  year = {1995},
  pages = {768-773}
}

@inproceedings{Stefanopoulou1997,
  title = {Dynamic Scheduling of Internal Exhaust Gas Recirculation Systems},
  author = {A.G. Stefanopoulou and I. Kolmanovsky},
  booktitle = {IMECE 1997, Sixth ASME Symposium on Advanced Automotive Technologies, Proceedings of},
  year = {1997},
  pages = {671-678},
  volume = {61},
  abstract = {In this paper we analyze the nonlinear dynamic behavior of an internal exhaust gas recirculation system base on the mean-value model of an experimental engine equipped with a camshaft phaser. We develop a dynamic camshaft timing schedule that regulates the internal exhaust gas recirculation system while maintaining transient engine torque response similar to an engine with zero exhaust gas recirculation. The dynamic schedule consists of a steady-state map of the camshaft timing for optimum exhaust gas recirculation based on throttle position and engine speed, and a first order lag that regulates the transition of the camshaft timing to the optimum point. A scheme for adjusting the time constant of the first order lag depending on engine speed and throttle position is described.},
  file = {papers_VVT/imece97.pdf},
  owner = {Admin},
  timestamp = {2009.12.09}
}

@article{Stefanopoulou1998,
  title = {Control-Oriented Model of a Dual Equal Variable Cam Timing Spark Ignition Engine},
  author = {A. G. Stefanopoulou and J. A. Cook and J. W. Grizzle and J. S. Freudenberg},
  journal = {Journal of Dynamic Systems, Measurement, and Control},
  year = {1998},
  number = {2},
  pages = {257-266},
  volume = {120},
  doi = {10.1115/1.2802417},
  file = {papers_VVT/vctMOD.pdf},
  publisher = {ASME},
  url = {http://link.aip.org/link/?JDS/120/257/1}
}

@article{Stefanopoulou1999a,
  title = {Joint Air-Fuel Ratio and Torque Regulation Using Secondary Cylinder Air Flow Actuators},
  author = {A. G. Stefanopoulou and J. A. Cook and J. W. Grizzle and J. S. Freudenberg},
  journal = {Journal of Dynamic Systems, Measurement, and Control},
  year = {1999},
  number = {4},
  pages = {638-647},
  volume = {121},
  doi = {10.1115/1.2802528},
  file = {papers_VVT/jsecthr.pdf},
  publisher = {ASME},
  url = {http://link.aip.org/link/?JDS/121/638/1}
}

@article{Stefanopoulou1999b,
  title = {Analysis and control of transient torque response in engines with internal exhaust gas recirculation},
  author = {Stefanopoulou, A.G. and Kolmanovsky, I.},
  journal = {Control Systems Technology, IEEE Transactions on},
  year = {1999},
  month = {September},
  number = {5},
  pages = {555-566},
  volume = {7},
  abstract = {We analyze the nonlinear dynamic behavior of an internal exhaust gas recirculation system based on a mean-value model of an experimental automotive engine equipped with a camshaft phaser. We develop a control scheme that adjusts camshaft timing to reduce feed-gas emissions while maintaining transient engine torque response similar to that of a conventional engine with zero exhaust gas recirculation. The control scheme consists of a feedforward map that specifies desired camshaft timing as a function of throttle position and engine speed in steady state, and a first-order lag that governs the transition of the camshaft timing to the desired value. The time constant of the first-order lag is adjusted based on engine speed and throttle position},
  doi = {10.1109/87.784419},
  file = {papers_VVT/pz.pdf::Djvu},
  issn = {1063-6536},
  keywords = {automobiles, internal combustion engines, poles and zeros, position control, torque control, transient responseautomotive engine, camshaft phaser, dynamic response, feed-gas emissions, internal combustion engines, internal exhaust gas recirculation, mean-value model, nonlinear dynamic behavior, poles and zeros, position control, throttle position, torque control, transient torque response}
}

@article{Stefanopoulou2000,
  title = {Variable camshaft timing engine control},
  author = {Stefanopoulou, A.G. and Freudenberg, J.S. and Grizzle, J.W.},
  journal = {Control Systems Technology, IEEE Transactions on},
  year = {2000},
  month = {January},
  number = {1},
  pages = {23-34},
  volume = {8},
  abstract = {Retarding camshaft timing in an engine equipped with a dual equal camshaft timing phaser reduces the unburned hydrocarbons (HC) and oxides of nitrogen (NOx) emitted to the exhaust system. Apart from this positive effect to feedgas emissions, camshaft timing can cause large air-to-fuel ratio excursions if not coordinated with the fuel command. Large air-to-fuel ratio excursions can reduce the catalytic converter efficiency and effectively cancel the benefits of camshaft timing. The interaction between the camshaft timing and the air-to-fuel ratio results in an inherent tradeoff between reducing feedgas emissions and maintaining high catalytic converter efficiency. By designing and analyzing a decentralized and a multivariable controller, we describe the design limitation associated with the decentralized controller architecture and we demonstrate the mechanism by which the multivariable controller alleviates the limitation},
  doi = {10.1109/87.817689},
  file = {papers_VVT/vctCON.pdf},
  issn = {1063-6536},
  keywords = {air pollution control, control system analysis, control system synthesis, decentralised control, internal combustion engines, multivariable control systems, timingNO, air-to-fuel ratio excursions, catalytic converter efficiency, dual equal camshaft timing phaser, feedgas emissions, fuel command, nitrogen oxides, unburned hydrocarbons, variable camshaft timing}
}

@inproceedings{Wang1999,
  title = {Idle speed control: an old problem in a new engine design},
  author = {Yan Wang and Stefanopoulou, A. and Levin, M.},
  booktitle = {American Control Conference, 1999. Proceedings of the 1999},
  year = {1999},
  month = {June},
  pages = {1217-1221 vol.2},
  volume = {2},
  abstract = {The idle speed control problem of a spark ignited engine equipped with camless valvetrain is considered. The camless valvetrain allows control of the individual cylinder valves and can be used to achieve unthrottled operation, and consequently, improve dramatically fuel economy. We formulate the speed control problem for this engine and show that it exhibits unstable open loop behavior with a significant delay in the feedback loop. The instability is intrinsic to the unthrottled operation and specific to the camless actuation used to achieve the unthrottled operation. The delay is caused by the discrete combustion process and the actuator/sensor interface. We demonstrate the inherent system limitations associated with the unstable dynamics and the delay and provide insight on the structural (plant) changes that can alleviate these limitations. Finally, a stabilizing controller is designed and tested on a crankangle-based simulation model},
  doi = {10.1109/ACC.1999.783234},
  file = {papers_VVT0/acc99.pdf},
  keywords = {delays, feedback, internal combustion engines, stability, velocity controlcamless valvetrain, crankangle-based simulation model, discrete combustion process, fuel economy, idle speed control, spark ignited engine, stabilizing controller, unstable open loop behavior, unthrottled operation}
}

@inproceedings{Wang2000,
  title = {Modeling of an Electromechanical Valve Actuator for a Camless Engine},
  author = {Wang, Y. and Stefanopoulou, A. and Haghgooie, M.and Kolmanovsky, I. and Hammoud, M.},
  booktitle = {AVEC '2000: 5th International Symposium on Advanced Vehicle Control},
  year = {2000},
  pages = {2907},
  volume = {5},
  file = {papers_EVA/avecyan.pdf::Djvu},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@techreport{Wang2002,
  title = {Modeling and Control of Electromechanical Valve Actuator},
  author = {Wang, Y. and Stefanopoulou, A. and Peterson, K. and Megli, T. and Haghgooie, M.},
  institution = {SAE},
  year = {2002},
  number = {2002-01-1106},
  comment = {SAE 2002 World Congress & Exhibition, March 2002, Detroit, MI, USA},
  doi = {10.4271/2002-01-1106},
  file = {papers_EVA/SAE2002_01_1106.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
}

@inproceedings{Wiese2017ACC,
  author = {A. P. Wiese and A. Stefanopoulou and A. Karnik and J. H. Buckland},
  title = {Model Predictive Control for Low Pressure Exhaust Gas Recirculation with Scavenging},
  booktitle = {American Control Conference (ACC)},
  year = {2017},
  pages = {3638-3643},
  doi = {10.23919/ACC.2017.7963510},
  file = {papers_VVT/Wiese2017ACC.pdf}
}

@inproceedings{Wiese2017SAE,
  author = {A. Wiese and A.G. Stefanopoulou and J. Buckland and A. Y. Karnik},
  title = {Modelling and Control of Engine Torque for Short-Circuit Flow and EGR Evacuation},
  booktitle = {SAE Technical Paper 2017-01-0606},
  year = {2017},
  doi = {10.4271/2017-01-0606},
  file = {papers_VVT/WieseSAE2017-01-0606.pdf}
}

@inproceedings{Yilmaz2003,
  title = {Control of charge dilution in turbocharged diesel engines via exhaust valve timing},
  author = {Yilmaz, H. and Stefanopoulou, A.},
  booktitle = {American Control Conference, 2003. Proceedings of the},
  year = {2003},
  month = {June},
  pages = { 761-766 vol.1},
  volume = {1},
  file = {papers_VVT/ACC2003_INV0401.pdf},
  issn = {0743-1619 },
  keywords = { MIMO systems, closed loop systems, controllers, diesel engines, nitrogen compounds, nonlinear systems, tracking air to fuel ratio, burned gas fraction, charge dilution control, closed loop controller, crankangle based dynamic nonlinear model, cycle averaged data, cycle sampled data, cylinder to cylinder breathing characteristics, exhaust valve timing, higher order nonlinear model, internal exhaust gas recirculation, low order linear models, model based controller, multi input multi output models, optimal tracking, particulate emission, six cylinder 12 liter turbocharged diesel engine, stringent constraints, transient fueling demands, turbocharger dynamics, variable valve timing}
}

@article{Yilmaz2005,
  author = {Hakan Yilmaz and Anna Stefanopoulou},
  title = {Control of Charge Dilution in Turbocharged Diesel Engines via Exhaust Valve Timing},
  journal = {Journal of Dynamic Systems, Measurement, and Control},
  year = {2005},
  volume = {127},
  number = {3},
  pages = {363-373},
  doi = {10.1115/1.1985440},
  file = {papers_VVT/Yilmaz.pdf},
  keywords = {diesel engines; valves; compressors; MIMO systems; air pollution control},
  publisher = {ASME},
  url = {http://link.aip.org/link/?JDS/127/363/1}
}

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