This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer
Technical Paper
2003-01-0036
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a variable valve actuation (VVA) system, we can achieve significant improvements in fuel efficiency, engine performance, emissions, etc. One of the most advanced variable valve actuation systems is the VVA operated by an electromechanical actuator without a camshaft, the so-called bi-positional electromechanical valve drive (BPVD). Existing BPVD's characteristically use a spring to provide the required mechanical power for operating a valve. The use of a spring provides many benefits to the design of the system, but it also results in difficult design challenges. The large holding force against the spring at the ends of the stroke virtually dictates the use of a normal-force electromagnetic actuator, which, from a servomechanical point of view, is not good compared to a shear-force bi-directional electromagnetic actuator. And, the large holding force generates a large jerk at the beginning and the end of a stroke and makes it difficult to achieve a soft valve landing. A new electromechanical valve drive (EMVD) design is proposed, which incorporates a nonlinear mechanical transformer and a shear-force electromagnetic actuator, which eliminates the large jerk and allows improved control under disturbances with acceptable average and peak electric power. This design is modeled, analyzed, and simulated.
Recommended Content
Authors
- Woo Sok Chang - Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology
- Tushar Parlikar - Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology
- John G. Kassakian - Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology
- Thomas A. Keim - Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology
Topic
Citation
Chang, W., Parlikar, T., Kassakian, J., and Keim, T., "An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer," SAE Technical Paper 2003-01-0036, 2003, https://doi.org/10.4271/2003-01-0036.Also In
References
- Yamaguchi Jack “New Powertrain Technology,” Automotive Engineering International 118 121 March 2000
- Moriya Yoshihito et. al. “VVT-i System,” Toyota Technical Review 47 1 48 53 Oct. 1997
- “BMW 3 Series,” Automotive Engineer 46 47 Sep. 1998
- Schlechter M. M. Levin M. B. “Camless Engine,” SAE Paper 960581 1996
- Dresner Thomas Barkan Philip “A Review of Variable Valve Timing Benefits and Modes of Operation,” SAE Paper 891676 1989
- Dresner Thomas Barkan Philip “A Review and Classification of Variable Valve Timing mechanisms,” SAE Paper 890674 1989
- Ahmad T. Theobald M.A. “A Survey of Variable-Valve-Actuation Technology,” SAE Paper 891674 1989
- Demmelbauer-Ebner W. Dachs A. Lenz H. P. “Variable Valve Actuation Systems for the Optimization of Engine Torque,” SAE Paper 910447 1991
- Asmus T. W. “Perspectives on Applications of Variable Valve Timing,” SAE Paper 910445 1991
- Kreuter P. Heuser P. Schebitz M. “Strategies to Improve SI-Engine Performance by Means of Variable Intake Lift, Timing, and Duration,” SAE Paper 920449 1992
- Pischinger M. et. al. “Benefits of the electromechanical valve train in vehicle operation,” SAE paper 2000-01-1223 2000
- “Camless BMW engine still faces hurdles,” Automotive Industries (AI) 34 Oct. 1999
- Flierl R. Fluting M. “The third generation of valvetrains - new fully variable valvetrains for throttle-free load control,” SAE paper 2000-01-1227 2000
- Theobald M. A. Lequesne B. Henry R. “Control of Engine Load via Electromagnetic Valve Actuator,” SAE Paper 940816 1994
- “Renault research,” AEI 114 Mar. 2000
- “Emission control,” Automotive World 10 15 Apr. 2000
- Butzmann S. et. al. “Sensorless control of electromagnetic actuators for variable valve train,” SAE paper 2000-01-1225 2000
- “Camless engine,” AEI 36 Feb. 2000
- Gottschalk Mark “Electromagnetic Valve Actuator Drives Variable Valvetrain,” Design News Nov. 1 1993
- Giles W. S. “Fundamentals of Valve Design and Material Selection,” SAE 660471 1966
- SAE Spring Committee “Spring Design Manual,” Society of Automotive Engineers, Inc. Warrendale, PA 2nd 321 356 1996 1-56091-680-X
- Slotine J.-J. Li W. “Applied Nonlinear Control,” 1991 Prentice-Hall Inc. Englwood Cliffs, NJ