This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Application of a General Planar Kinematics and Multi-Body Dynamics Simulation Tool to the Analysis of Variable Valve Actuation Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
Annotation ability available
The advantages of Variable Valve Actuation (VVA) in the aspects of improved engine performance, fuel economy and reduced emissions are well known in the industry. However, the design and optimization of such systems is complex and costly. The design process of VVA mechanisms can be greatly accelerated through the use of sophisticated simulation tools. Predictive numerical analysis of systems to address design issues and evaluate design changes can assure the required performance and durability. One notable requirement for the analysis and design of novel mechanically-actuated VVA systems is a general-purpose fast and easy-to-use planar mechanism kinematics analyzer with cam solution/design features, which can be applied to general mechanisms.
This paper introduces a general simulation and design tool, which features general planar kinematics and multi-body dynamics analysis capabilities, as well as integrated hydromechanics and hydraulics to model devices such as lash adjusters and cam phasers. Application of the methodology to various mechanically-driven variable valve actuation systems is discussed, with focus on a specific system. The modeling process is broken down into multiple stages. First, the analysis of kinematic motion of valvetrain components along with the procedure to calculate the cam shape profile required to produce the desired valve lift is described. Second, a constrained-dynamics simulation of a rigid system is carried out in search of nominal (quasi-dynamic), inter-component forces, valve spring margin and cam-follower separation speed. Third, a complete multi-body dynamics analysis, which considers the elasticity of valvetrain components and inter-component contacts, is employed to produce a wide array of detailed dynamic predictions. Ways of rapidly optimizing the key design parameters through the use of dedicated numerical analysis are briefly discussed.
CitationOkarmus, M., Keribar, R., and Suh, E., "Application of a General Planar Kinematics and Multi-Body Dynamics Simulation Tool to the Analysis of Variable Valve Actuation Systems," SAE Technical Paper 2010-01-1193, 2010, https://doi.org/10.4271/2010-01-1193.
- Hannibal, W. Flierl, R. Stiegler, L. Meyer, R. “Overview of Current Continuously Variable Valve Lift Systems for Four-Stroke Spark-Ignition Engines and the Criteria for their Design Ratings,” SAE Technical Paper 2004-01-1263 2004
- Dresner, T. Barkan, P. “A Review of Variable Valve Timing Benefits and Modes of Operation,” SAE Technical Paper 891676 1989
- “Toyota develops continuously variable valve timing engine” WARDS Engine and Vehicle Technology Update July 15 1995
- “Honda tweaks VTEC design” WARDS Engine and Vehicle Technology Update July 15 1995
- Gamma Technologies, Inc. www.gtisoft.com
- Flierl, R. Hofman, R. Landerl, C. Melcher, T. Steyer, H. “The New BMW Four Cylinder Engine with Valvetronic. Part 1: Concept, Design and Construction” MTZ 62 2001 6 450 463
- “Variable Valve Lift and Duration Mechanism Designed for a High-Speed Engine” Engine Technology Progress in Japan April 2007
- Press, W. Vetterling, W. Teukolsky, S. Flannery, B. “Numerical Recipes in Fortran. Second Edition” Cambridge University Press 1992
- Wilson, C. Sadler, J. Michels, W. “Kinematics and Dynamics of Machinery” Harper Collins Publishers 1983
- Lin, Y. Ramachandra, P. Tanaka, Y. Tawata, K. Yano, Y. Sawada, R. “Valve Train Dynamic Analysis And Validation,” SAE Technical Paper 2004-01-1457 2004
- Gamma Technologies Inc. “Mechanics Theory Manual” 2009
- Amirouche, F. “Fundamentals of Multibody Dynamics. Theory and Applications” Birkhauser Boston 2006
- Keribar, R. “A Valvetrain Design Analysis Tool with Multiple Functionality,” SAE Technical Paper 2000-01-0562 2000
- Gronlund, T. Larmi, M. “Valve Train Design for a New Gas Exchange Process,” SAE Technical Paper 2004-01-0607 2004
- Okarmus, M. Keribar, R. Ham, R. “Integrated Hydro-mechanical Simulation of a Cam-Rocker-Unit Injector System to Address Noise and Vibration Issues,” SAE Technical Paper 2006-01-0887 2006
- Okarmus, M. Keribar, R. Oliva, M. Tonin, N. “Application of an Integrated Valvetrain and Hydraulic Model to Characterization and Retuning of Exhaust Valve Behavior with a DPF,” SAE Technical Paper 2008-01-0292 2008
- Delphi Corporation www.delphi.com
- Adams Multibody Dynamics www.mscsoftware.com
- Peterson, M. Winer, W. “Wear Control Handbook” ASME 1980
- Herting, D.N. “A general purpose, multi-stage, component modal synthesis Finite Elements in Analysis and Design” 1 153 164 1985