| 摘要 |
PURPOSE: An EHV(Electro-Hydro Variable Valve) system is provided to implement an asymmetrical valve lift on the valves included in a cylinder. CONSTITUTION: An EHV system comprises a pump piston housing(30), a pump piston(20), a pump piston elastic part(34), first and second EHV devices(100,101) which are included in a cylinder, a first oil control valve(200), a first oil control flow path(610) which connects a main chamber(32) and the first oil control valve, a second oil control flow path(620) which connects the first oil control valve and the first EHV device, a third oil control flow path(630) which connects the main chamber and the second EHV device, a fourth oil control flow path(640) whose one end is selectively connected to the second oil control valve by the operation of the first oil control valve and the other end is connected to the third oil control flow path, an accumulator(400) which is connected to the fourth oil control flow path, and a second oil control valve(300) which is provided on the fourth oil control flow path to selectively connect the second EHV device and the accumulator.
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