NDLI: A new electromagnetic valve actuator

Content Provider	IEEE Xplore Digital Library
Author	Chang, W.S. Parlikar, T.A. Seeman, M.D. Perreault, D.J. Kassakian, J.G. Keim, T.A.
Copyright Year	2002
Description	Author affiliation: Massachusetts Institute of Technology (Chang, W.S.)
Abstract	In conventional internal combustion engines, engine valve displacements are fixed relative to crankshaft position. If these valves are actuated as a variable function of crankshaft angle, significant improvements in fuel economy can be achieved. Existing electromagnetically actuated variable-valve-timing (WT) systems characteristically use springs to provide the large inertial power to move the engine valves. However, the large spring forces generated when the valve is being closed or opened make it difficult to hold the valve without using a normal-force electromagnetic actuator. With normal-force electromagnetic actuators, it is difficult for the valve to engage its seat at a low velocity. Furthermore, from a control systems perspective, these unidirectional normal-force actuators pose difficult design challenges when compared to bi-directional shear-force actuators, as the former have nonuniform force constants. In this paper, we propose a novel electromagnetic valve drive (EMVD) system, and discuss the design and construction of the experimental apparatus, power electronics and controllers for the EMVD. This EMVD comprises an electric motor that is coupled to an engine valve-spring system with a nonlinear mechanical transformer. Simulation results show significant advantages of this EMVD over previously designed actuation systems.
Starting Page	109
Ending Page	118
File Size	1018278
Page Count	10
File Format	PDF
ISBN	0780374924
DOI	10.1109/PET.2002.1185558
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Valves Actuators Internal combustion engines Fuel economy Springs Control systems Automotive engineering Technological innovation Cams Torque
Content Type	Text
Resource Type	Article

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