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Comparison of Different Kinematic Solutions for Mechanical Continuously Variable Valve Lift Systems
Technical Paper
2004-01-1396
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Variable valve timing represents one of the key technologies in further development of automotive engines.
Different valve lift profiles and variable valve timing in the engine operation map offer the flexibility to better meet the load specific engine requirements regarding the intake flow conditions, the exhaust gas control and the efficiency of load exchange, mixture preparation and combustion.
Mechanical solutions for continuously variable valve lift and timing are based on different principles such as:
- systems, which perform the variable valve lift and timing by superposition of the opening and closing flank of two continuously rotating cams
- systems, which translate a fixed cam profile into a variable valve movement by varying the position of an oscillating transmission link
This paper describes the specific kinematics of different mechanical principles and illustrates the resulting properties and restrictions considering lift/event-ratio, phasing of the opening event, minimum and maximum valve lift, valve acceleration, as well as precision requirements.
The thermodynamic characteristics like benefits in full-load performance, reductions in pumping losses, support of mixture preparation and idle quality will be discussed on the base of load exchange calculations as well as test bench results.
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Authors
- Peter Kreuter - Meta Motoren- und Energie-Technik GmbH
- Peter Heuser - Meta Motoren- und Energie-Technik GmbH
- Joachim Reinicke - Meta Motoren- und Energie-Technik GmbH
- Rüdiger Erz - Meta Motoren- und Energie-Technik GmbH
- Ulrich Peter - Meta Motoren- und Energie-Technik GmbH
- Oliver Böcker - Meta Motoren- und Energie-Technik GmbH
Topic
Citation
Kreuter, P., Heuser, P., Reinicke, J., Erz, R. et al., "Comparison of Different Kinematic Solutions for Mechanical Continuously Variable Valve Lift Systems," SAE Technical Paper 2004-01-1396, 2004, https://doi.org/10.4271/2004-01-1396.Also In
References
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- Kreuter P. Heuser P. Reinicke-Murmann J. The Meta VVH System - A Continuously Variable Valve Timing System SAE Paper 980765
- Kreuter P. Heuser P. Reinicke-Murmann J. Erz R. Peter U. The Meta VVH System - The Advantages of Continuously Mechanical Variable Valve Timing SAE Paper 99P-450