Patent ID: 8424499
Filing Date: 2013-04-23
Classification: F01L

Abstract:
1. A pneumatic system for controlling the valves of an internal combustion engine; the pneumatic system comprising: a pneumatic accumulator containing pressurized air; a compressor to maintain the pneumatic accumulator under pressure; a pneumatic manifold; a control device to connect the pneumatic manifold alternatively to the pneumatic accumulator with the internal combustion engine in the high rpm range and to the atmosphere with the internal combustion engine in the low rpm range; a plurality of pneumatic springs, each of which comprises a variable volume actuating chamber and a piston mounted slidingly inside the actuating chamber and mechanically coupled to a stem of a respective valve of the internal combustion engine; and a plurality of connecting conduits, each of which connects the actuating chamber of a respective pneumatic spring to the pneumatic manifold; wherein the pneumatic system comprises a plurality of calibrated cross-sectional portions, each of which has a reduced cross-sectional area and is arranged along a respective connecting conduit.