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A Review of Variable Valve Timing Benefits and Modes of Operation
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Abstract
It has long been known that IC engine variable valve timing (VVT) has the potential for significant improvements in engine performance. Many technical papers have been published on the potential benefits of internal combustion engine variable valve timing and the modes of valve operation that can be used to realize these benefits. Almost 800 US patents have been released on the subject of mechanisms to effect VVT since 1880. An extensive review of this literature and patents was made to determine the benefits obtainable from VVT and what operation modes allow these benefits to be obtained.
We conclude that VVT has much potential. The potential gains include 15% or more average fuel economy gains as well as significant improvements in torque characteristics, emission reductions, etc. Nevertheless, little of VVT's potential has yet been realized, since serious mechanical difficulties have limited VVT applications to date.
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Citation
Dresner, T. and Barkan, P., "A Review of Variable Valve Timing Benefits and Modes of Operation," SAE Technical Paper 891676, 1989, https://doi.org/10.4271/891676.Also In
References
- Dresner, T.L. Barkan, P. 1989 “A Review and Classification of Variable Valve Timing Mechanisms” SAE Paper 890674
- Dresner, T.L. 1988 “Multi-Input Cam-Actuated Mechanisms and Their Application to IC Engine Variable Valve Timing” Stanford University
- Novak, J.M. Blumberg, P.N. 1978 “Parametric Simulation of Significant Design and Operating Alternatives Affecting the Fuel Economy and Emissions of Spark-Ignited Engines” SAE Paper 780943
- Freeman, M.A. Nicholson, R.C. 1972 “Valve Timing for Control of Oxides of Nitrogen” SAE Paper 720121
- Siewart, R.M. 1971 “How Individual Valve Timing Events Affect Exhaust Emissions” SAE Paper 710609
- Bates, B. Dosdaii, J.M. Smith, D. R 1978 “Variable Displacement by Engine Valve Control” SAE Paper 780145
- Stecklein, G.L. Southwest Research Institute 1987 Personal Communication
- Elrod, A.C. Nelson, M.T. 1986 “Development of a Variable Valve Timed Engine to Eliminate the Pumping Losses Associated with Throttled Operation” SAE Paper 860537
- Ball, G.A. Elliott, C.M. 1982 “Passenger Car Spark Ignition Data Base Variable Valve Timing” Chrysler Corporation Engineering Office for U.S. Department of Transportation
- Geringer, B. 1988 “Variable Intake Valve Control and Optimized Intake Manifolds for Torque Curve improvement and Fuel Consumption Reduction” Carlson Stephen Bendix Electronics Internationales Wiener Motorensymposium 12 99 54 74
- Kerr, J. July 30 1980 “Variable Valve Timing to Boost any Engine” The Engineer 28 29 54
- Nagao, F. Nishiwaki, K. Kajiya. S. 1968 “Valve Timing Control by a Hydraulic Tappet with a Leak Hole” Bulletin of JSME 11 #48 1175 1180
- Nagao, F. Nishiwaki, K. Otsubo, K. Yokoyama, F. Okada, T. 1968 “Relation between Valve Angle-Area and Low Speed Performance of a Uniflow-Scavenged Engine” Bulletin of JSME 11 #48 1181 1187
- Nagao, F. Nishiwaki, K. Otsubo, K. Yokoyama, F. 1969 “Relation between Inlet Valve Closing Angle and Volumetric Efficiency of a Four-Stroke Engine” Bulletin of JSME 12 #52 894 901
- Maekawa, K. Ohsawa, N. 1989 “Development of a Valve Timing Control System” SAE Paper 890680
- Hara. S. Kumagai, K. Matsumoio, Y. 1989 “Application of a Valve Lift and Timing Control System to an Automotive Engine” SAE Paper 890681
- Allen M. February 1988 “The Inside Story” Popular Mechanics 62 65
- Gray, C. 1988 “A Review of Variable Valve Timing” SAE Paper 880386
- Herrin, R.J. Pozniak, D.J. 1984 “A Lost-Motion, Variable-Valve-Timing System for Automotive Piston Engines” SAE Paper 840335
- Parker, D.A. Kendrick, M. 1974 “B-l-11 - A Camshaft with Variable Lift-Rotation Characteristics; Theoretical Properties and Application to the Valve Gear of a Multicylinder Piston Engine” Fisita Congress Paris 224 232
- Scott, D. Yamaguchi, J. October 1980 “Eccentric Cam Drive Varies Valve Timing” Automotive Engineering 120 124
- Scott, D. February 1981 “Trick Camshaft Boosts Engine Power, Economy” Popular Science 8 12
- Anonymous 1973 “Variable Camshaft Boosts Engine Efficiency” Automotive Engineering 81 #12 11 13
- Anonymous November 1978 “Four-stroke Variable Valve Timing and Lift” Motorcycle Sport 480 485 England
- Griffiths, P. Misery, K.N. 1988 “Variable Valve Timing for Fuel Economy improvement - The Mitchell System” SAE Paper 880392
- Norbye, J.P. April 1977 “Variable Valve Timing & Rotary Valves” Popular Science 121 125
- Ma, T.H. 1987 “Recent Advances in Variable Valve Timing” Alternative and Advanced Automotive Engines New York Plenum Press 235 252
- Stone, C.R. Kwan, E.K.M. August/September 1985 “Variable Valve Timing for IC Engines” Automotive Engineer 10 54 58
- Stone, R. Kwan, E. 1989 “Variable Valve Actuation Mechanisms and the Potential for their Application” SAE Paper 890673
- Tuttle, J.H. 1982 “Controlling Engine Load by Means of Early Engine-Valve Closing” SAE Paper 820408
- Payri, F. Desantes, J.M. Corberan, J. M. 1988 “A Study of the Performance of an SI Internal Combustion Engine Incorporating a Hydraulically Controlled Variable Valve Timing System” SAE Paper 880604
- Lenz, H.P. Wichart, K. Gruden, D. 1988 “Variable Valve Timing: A Possibility to Control the Engine Load Without Throttle” SAE Paper 880388
- Lenz, H.P. Geringer, B. Smetana, G. Dachs, A. 1989 “Initial Test Results of an Electro-Hydraulic Variable-Valve Actuation System on a Firing Engine” SAE Paper 890678
- Tuttle, J.H. 1980 “Controlling Engine Load by Means of Late Engine-Valve Closing” SAE Paper 800794
- Ma, T.H. 1988 “The Effect of Variable Engine Valve Timing for Fuel Economy” SAE Paper 880390
- Mueller, R.S. Uitviugt, M.W. 1978 “Valve Selector Hardware” SAE Paper 780146
- Stivender, D.L. 1968 “Intake Valve Throttling (IVT) - A Sonic Throttling Intake Valve Engine” SAE Transactions 77 2 1293 1302
- Stivender, D.L. 1978 “Engine Air Control - Basis of a Vehicular Systems Control Hierarchy” SAE Paper 780346
- Meacham, G.B.K. 1970 “Variable Cam Timing as an Emission Control Tool” SAE Journal 2127 2144
- Schiele, C A. DeNagel, S.F. Bennethum, J.E. 1974 “Design and Development of a Variable Valve Timing (VVT) Camshaft” SAE Paper 740102
- Ma, T.H. Rajabu, H. 1988 “Computer Simulation of an Otto-Atkinson Cycle Engine with Variable Timing Multi-Intake Valves and Variable Compression Ratio” Proc Instn Mech Engrs 273 277
- Saunders, R.J. Wahab, E.A. 1989 “Variable Valve Closure Timing for Load Control and the Otto Atkinson Cycle Engine” SAE Paper 890677
- Pouliot, H.N. Delameter, W.R. Robinson, C. W. 1978 “A Variable-Displacement Spark-Ignition Engine” SAE Transactions 86 1 446 464
- Givens, L. May 1977 “A New Approach to Variable Displacement” Automotive Engineering 30 34
- Dunne, J. October 1980 “Cadillac's Revolutionary 3-in-l V8” Popular Science 121 122
- Givens, L. October 1980 “Cadillac Introduces V-8-6-4 Engine” Automotive Engineering 52 54
- Anonymous October 21 1976 “Dual-Displacement Engine Boosts Fuel Economy” Machine Design 10 12
- Blackmore, D.R. Thomas, A. 1979 “The Scope for improving the Fuel Economy of the Gasoline Engine” Passenger Car Power Plant of the Future, I. Mech. E. Conference Publications 9 18
- Seilly, A.H. 1979 “Helenoid Actuators - A New Concept in Extremely Fast Acting Solenoids” SAE Paper 790119
- Inoue, K. Nagahiro, K. Ajiki, Y Kishi, N. 1989 “A High Power, Wide Torque Range, Efficient Engine with a Newly Developed Variable-Valve-Lift and-Timing Mechanism” SAE Paper 890675
- 1974 “Designing a Variable Valve Timing Camshaft” Automotive Engineering 82 #3 50 53
- Mardell, J.E. Cross, R.K. 1988 “An Integrated Full Authority Electrohydraulic Engine Valve and Diesel Fuel Injection System” SAE Paper 880602
- Cambeis, W. Haase, K. April 5 1955 U.S. patent 2,705,480
- Egan, J.J. April 24 1979 U.S. patent 4,150,640
- Hanley, G.P. October 8 1962 U.S. patent 3,106,195
- Jonsson, E. February 6 1968 U.S. patent 3,367,312
- Rosquist, V.D. June 8 1982 U.S. patent 4,333,430
- Udelman, J.K. March 6 1962 U.S. patent 3,023,870
- Ueno, T. May 25 1976 U.S. patent 3,958,900
- Ueno, T. June 15 1976 U.S. patent 3,963,379
- Peterson. A.C. February 10 1931 U.S. patent 1,792,028
- Bland, L.N. June 14 1927 U.S. patent 1,632,531
- Morgan, T.W. August 17 1915 U.S. patent 1,150,291
- Riotte, C.C. July 11 1905 U.S. patent 794,683
- Winkley, E.E. January 13 1942 U.S. patent 2,269,924
- Cox. A.E. August 24 1920 U.S. patent 1,350,989
- Dresner, T.L. Barkan, P. 1989 “The Application of a Two-Input Cam-Actuated Mechanism to Variable Valve Timing” SAE Paper 890676
- Simanaitis, D. December 1985 “Nissan Aims for the Top” Road & Track 42 48