This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Perspectives on Applications of Variable Valve Timing
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1991 by SAE International in United States
Annotation ability available
While Variable Valve Timing (VVT) holds the potential to alleviate some of the compromises normally associated with engine operation over broad speed and load ranges, generalizing its benefits in a quantitative manner is difficult. Details of base engine design and the means of VVT execution and engine duty cycle play major roles in determining the outcome of such an application.
With the profusion of VVT means available, the matter of selecting an appropriate system for a given engine and duty cycle is difficult particularly when there is a host of competing features and technologies.
This treatment of VVT is based on assessments of compromises associated with static valve timing and provides a framework for considering VVT as an engine performance option. Extensive use is made of pressure and geometric data, and several generalizations are made relative to strategies for incorporating common VVT systems.
CitationAsmus, T., "Perspectives on Applications of Variable Valve Timing," SAE Technical Paper 910445, 1991, https://doi.org/10.4271/910445.
- Ahmad, T. Theobald M. A. “A Survey of Variable-Valve-Actuation Technology,” SAE Paper 891674 , SAE Trans. 1989
- Gray, C. “A Review of Variable Engine Valve Timing,” SAE Paper 880386 , SAE Trans. 1988
- Asmus, T. W. “Effects of Valve Events on Engine Operation,” Fuel Economy in Road Vehicles Powered by Spark Ignition Engines Hilliard J. C. Springer G. S. Plenum Press New York 1984
- Stivender, D. L. “Intake Valve Throttling (IVT) - A Sonic Throttling Intake Valve Engine,” SAE Paper 680399, SAE Trans. 77 1968
- Davis, G. C. Tabaczynski R. S. Belaire R. C. “The Effect of Intake Valve Lift on Turbulence Intensity and Burnrate in S.I. Engines - Model Versus Experiment,” SAE Paper 840030 , SAE Trans. 1984
- Newman, C. E. Stein R. A. Warren C. C. Davis G. C. “The Effects of Load Control with Port Throttling at Idle-Measurements and Analyses,” SAE Paper 890679 , SAE Trans. 1989
- Tuttle, J. H. “Controlling Engine Load by Means of Late Intake-Valve Closing,” SAE Paper 800794 , SAE Trans. 89 1980
- Siewert, R. M. “How Individual Valve Timing Events Affect Exhaust Emissions,” SAE Paper 710609 , SAE Trans. 80 1971
- Tuttle, J. H. “Controlling Engine Load by Means of Early Intake-Valve Closing,” SAE Paper 820408 , SAE Trans. 91 1982
- Tasaka, H. Matsuoka S. “Predictions of Combustion, Fuel Economy, and Emissions Characteristics Influenced by The Gas Exchange Process of S.I. Engines,” SAE Paper 810821 , SAE Trans. 90 1981
- Tasaka, H. Matsuoka S. “Analysis of Gas Exchange Process of S.I. Engines Under City-Driving Conditions,” SAE Paper 800535 , SAE Trans. 89 1980
- Saunders, R. J. Abdul-Wahab E. A. “Variable Valve Closure Timing for Load Control and The Otto Atkinson Cycle Engine,” SAE Paper 890677 , SAE Trans. 1989
- Ma, T. H. “Effects of Variable Engine Valve Timing on Fuel Economy,” SAE Paper 880390 , SAE Trans. 1988
- Taylor, C. F. The Internal-Combustion Engine in Theory and Practice 1 202 M.I.T. Press Cambridge, MA 1985
- Kastner, L. J. Williams T. J. White J. B. “Poppet Inlet Valve Characteristics and Their Influence on the Induction Process,” Proc. Instn. Mech. Engrs. 178 1 36 1963-64
- Heywood, J. B. Internal Combustion Engine Fundamentals McGraw-Hill Book Company New York 1988
- Blair, G. P. Goulbum J. R. “An Unsteady Flow Analysis of Exhaust Systems for Multicylinder Automobile Engines,” SAE Paper 690469 , SAE Trans. 78 1969
- Grohn, M. “The New Camshaft Adjustment System by Mercedes-Benz-Design and Application in 4-Valve Engine,” SAE Paper 901727 1990
- Tabaczynski, R. J. Heywood J. B. Keck J. C. “Time-Resolved Measurements of Hydrocarbon Mass Flow Rate in the Exhaust of a Spark-Ignition Engine,” SAE Paper 720112 , SAE Trans. 81 1972