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}
  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_EVA/ifac_2004_conf4.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
  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_EVA/port17.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
  author = {Peterson, K.S. and Stefanopoulou, A.G.},
  title = {Rendering the electromechanical valve actuator globally asymptotically
  booktitle = {Decision and Control, 2003. Proceedings. 42nd IEEE Conference on},
  year = {2003},
  volume = {2},
  pages = {1753-1758},
  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
  author = {Peterson, K. and Stefanopoulou, A. and Megli, T. and Haghgooie, M.},
  title = {Output observer based feedback for soft landing of electromechanical
	camless valvetrain actuator},
  booktitle = {American Control Conference, 2002. Proceedings of the 2002},
  year = {2002},
  volume = {2},
  pages = {1413-1418},
  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
  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}
  author = {Peterson, K.S. and Stefanopoulou, A.G. and Wang, Y. and Haghgooie,
  title = {Nonlinear Self-Tuning Control for Soft Landing of an Electromechanical
	Valve Actuator},
  booktitle = {Mechatronic Systems 2002: A Proceedings Volume from the 2nd IFAC
  year = {2002},
  pages = {191-196},
  file = {papers_EVA/mech2002_G1_102.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
  author = {Katherine S. Peterson and Anna G. Stefanopoulou},
  title = {Extremum seeking control for soft landing of an electromechanical
	valve actuator},
  journal = {Automatica},
  year = {2004},
  volume = {40},
  pages = {1063 - 1069},
  number = {6},
  doi = {DOI: 10.1016/j.automatica.2004.01.027},
  file = {papers_EVA/Automatica_04.pdf},
  issn = {0005-1098},
  keywords = {Electromagnetic devices},
  url = {http://www.sciencedirect.com/science/article/B6V21-4C1F9XM-2/2/2f4cc30a0edc08961932983f8a649406}
  author = {Peterson, K. S. and Stefanopoulou, A. G. and Wang, Y},
  title = {Control of Electromechanical Actuators: Valves Tapping in Rhythm},
  booktitle = {Multidisciplinary Research in Control, The Mohammed Dahleh Symposium
  publisher = {Springer-Verlag},
  year = {2003},
  editor = {L. Giarre' and B. Bamieh},
  volume = {289},
  series = {Lecture Notes in Control and Information Sciences},
  note = {ISBN 3-540-00917-5},
  doi = {10.1007/3-540-36589-3_14},
  file = {EVA_PDF/book13.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
  author = {Peterson, K. S. and Stefanopoulou, A. G. and Wang, Y. and Megli,
  title = {Virtual Lash Adjuster for an Electromechanical Valve Actuator through
	Iterative Learning Control},
  booktitle = {ASME Conference Proceedings, ASME 2003 International Mechanical Engineering
	Congress and Exposition (IMECE2003)},
  year = {2003},
  volume = {2003},
  number = {37130},
  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}
  author = {Wang, Y. and Stefanopoulou, A. and Haghgooie, M.and Kolmanovsky,
	I. and Hammoud, M.},
  title = {Modeling of an Electromechanical Valve Actuator for a Camless Engine},
  booktitle = {AVEC '2000: 5th International Symposium on Advanced Vehicle Control},
  year = {2000},
  number = {93},
  file = {papers_EVA/avecyan.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
  author = {Wang, Y. and Stefanopoulou, A. and Peterson, K. and Megli, T. and
	Haghgooie, M.},
  title = {Modelling and Control of Electromechanical Valve Actuator},
  institution = {SAE},
  year = {2002},
  number = {2002-01-1106},
  comment = {SAE 2002 World Congress & Exhibition, March 2002, Detroit, MI, USA},
  file = {papers_EVA/SAE2002_01_1106.pdf},
  owner = {Admin},
  timestamp = {2009.10.30}
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