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Technical Paper

The Meta VVH System - A Continuously Variable Valve Timing System

1998-02-01
980765
A continuously variable valve timing system called the “Meta VVH System” is presented. It allows the unthrottled load control of spark ignition engines. Two camshafts rotating at the same speed are acting on the intake valve(s) via a follower and a transmission element in such a way, that the output displacement is the sum of the effective displacements of the two cams. The first camshaft which operates as an opening cam is driven directly by the crankshaft. The second camshaft operating as the closing cam is driven by the opening cam via a four wheel gear drive. This gear drive allows a phasing between both camshafts in a range necessary to vary lift and duration of the valve(s) from zero to maximum. This system not only offers the flexibility and range required for an unthrottled load control but also shows benefits concerning its friction losses even in comparison to modern state of the art valve trains like the roller finger follower.
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