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Design and Development of a Mechanical Variable Valve Actuation System
Technical Paper
2000-01-3307
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Compromises inherent with fixed valve lift and event timing have prompted engine designers to consider Variable Valve Actuation (VVA) systems for many decades. In recent years, some relatively basic forms of VVA have been introduced into production engines. Greater performance and driveability expectations of customers, more stringent emission regulations set by government legislators, and the mutual desire for higher fuel economy are increasingly at odds. As a solution, many OEM companies are seriously considering large-scale application of higher function VVA mechanisms in their next generation vehicles.
This paper describes the continuing development progress of a mechanical VVA system. Design features and operation of the mechanism are explained. Test results are presented in two sections: motored cylinder head test data focuses on VVA system friction, control system performance, valve lift and component stress. Dynamometer results from a four-cylinder test engine focus on fuel consumption, emissions, torque and combustion stability characteristics. The paper finishes with a description of proposed future activities.
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Citation
Pierik, R. and Burkhard, J., "Design and Development of a Mechanical Variable Valve Actuation System," SAE Technical Paper 2000-01-3307, 2000, https://doi.org/10.4271/2000-01-3307.Also In
References
- Pierik, R. “The Application and Engine Performance Benefits of a Mechanical Variable Valve Actuation System” 7th Aachen Kolloquium Fahrzeug- und Moterntechnik Aachen, Germany 1998
- Kreuter, P. et al. “The Meta VVH System - The Advantages of Continuously Variable Valve Timing” SAE 1999-01-0329
- Pulkrabek, W. “Engineering Fundamentals of the Internal Combustion Engine” Prentice Hall NJ 1997
- Obert, E. “Internal Combustion Engines and Air Pollution” Harper and Row NY 1973