Journal for Geometry and Graphics 22 (2018), No. 1, 099--114
Copyright Heldermann Verlag 2018
Fully Variable Valve Control: A Geometric Approach
Anton Gfrerrer
Institute of Geometry, Graz University of Technology, Kopernikusgasse 24, 8010 Graz, Austria
gfrerrer@tugraz.at
Johann Lang
Institute of Geometry, Graz University of Technology, Kopernikusgasse 24, 8010 Graz, Austria
Variable valve timing (VVT) and variable valve lift (VVL) are used to improve the performance, fuel economy and to reduce emissions of a combustion engine. Recently these issues have assumed increasing importance. Here we will combine VVT and VVL in a unified concept of variable valve control (VVC). We present a mechanical solution to fully variable valve control. The cam consists of two symmetric parts that slide on the camshaft; this way the system can provide a continuum of cam characteristics to meet a wide range of engine requirements.
Keywords: Internal combustion engine, camshaft, valve timing, valve lift, valve control, surface interpolation, envelope surface.
MSC: 53A17; 53A04
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