A CUSTOMDESIGED LIMITEDAGLE ACTUATOR FOR AELECTROMECHAICAL EGIE VALVE DRIVE PART I: COCEPTUAL DESIG

Research has shown that variable valve timing (VVT) can improve significantly the performance of internal combustion (IC) engines, including higher fuel efficiencies, lower emissions, and larger torque outputs at each point of the engine map. To achieve independent and continuous VVT for each valve, an electromechanical valve drive (EMV) system was proposed previously, whose feasibility with low seating velocity had been demonstrated. In order to further improve the practicality of the EMV system, especially for a much smaller system package, a novel rotary actuator with limited angular range is proposed in this paper. Four main design challenges are discussed before a limited#angle actuator with a special yoke structure and a hollow basket#shaped aluminium#based armature is presented. Based on Maxwell simulation with optimized physical dimensions, the actuator is capable of meeting the time, power, torque, and size constraints.

[1]  Martin Pischinger,et al.  Benefits of the Electromechanical Valve Train in Vehicle Operation , 2000 .

[2]  Tushar Anil Parlikar.  Experimental implementation of an electromagnetic engine valve , 2003 .

[3]  T.A. Parlikar,et al.  Design and experimental implementation of an electromagnetic engine valve drive , 2005, IEEE/ASME Transactions on Mechatronics.

[4]  G. B. Parvate-Patil,et al.  An Assessment of Intake and Exhaust Philosophies for Variable Valve Timing , 2003 .

[5]  D.J. Perreault,et al.  Design and experimental evaluation of an electromechanical engine valve drive , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[6]  Ingo Lenz,et al.  A Fully Continuous Variable Cam Timing Concept for Intake and Exhaust Phasing , 1998 .

[7]  Thomas Dresner,et al.  A Review of Variable Valve Timing Benefits and Modes of Operation , 1989 .

[8]  Achim Koch,et al.  Sensorless Control of Electromagnetic Actuators for Variable Valve Train , 2000 .

[9]  T. Ahmad,et al.  A Survey of Variable-Valve-Actuation Technology , 1989 .

[10]  David J. Perreault,et al.  Optimal cam design and system control for an electromechanical engine valve drive , 2010, 2010 IEEE International Conference on Industrial Technology.

[11]  Anna G. Stefanopoulou,et al.  Rendering the electromechanical valve actuator globally asymptotically stable , 2003, 42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475).

[12]  Eric Rask,et al.  Two-Step Variable Valve Actuation for Fuel Economy, Emissions, and Performance , 2003 .

[13]  R. Flierl,et al.  The Third Generation of Valvetrains - New Fully Variable Valvetrains for Throttle-Free Load Control , 2000 .

[14]  V. Picron,et al.  Electro-Magnetic Valve Actuation System: First Steps toward Mass Production , 2008 .