Patent ID: 6691651
Filing Date: 2004-02-17
Classification: F01L

Abstract:
An engine valve operating system for an internal combustion engine, comprising:a movable member interlocking with an engine valve of the engine; a first electromagnet moving said movable member in a valve opening direction when said first electromagnet is energized; a second electromagnet moving said movable member in a valve closing direction when said second electromagnet is energized; a first spring installed to the engine valve, said first spring applying a force directed in the valve opening direction to said movable member; a second spring installed to said movable member, said second spring applying a force directed in the valve closing direction to said movable member; and a magnetic-circuit member connected to said first electromagnet and said second electromagnet, said magnetic-circuit member being made of soft magnetic material; wherein said magnetic-circuit member, said movable member and one of said first and second electromagnets form a first magnetic circuit when a clearance between said movable member and the one of said first and second electromagnets is within a far-side range including a distance equal to a half of a stroke of said movable member, the first magnetic circuit passing magnetic flux from said movable member to said magnetic-circuit member, wherein said movable member and the one of said first and second electromagnets form a second magnetic circuit when the clearance between said movable member and the one of said first and second electromagnets is within a near-side range including a smallest distance between said movable member and the one of the said first and second electromagnets.