Spool valve control of an electrohydraulic camless valvetrain

Details Spool valve control of an electrohydraulic camless valvetrain Spool valve control of an electrohydraulic camless valvetrain

F - Mech Eng,Light,Heat,Weapons

01

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F01L 9/02 (2006.01) F02D 13/02 (2006.01)

Patent

CA 2165849

An engine valve assembly (10) within an electrohydraulic camless valvetrain cooperates with a hydraulic system (8) having a low pressure branch (70) and a high pressure branch (68) to selectively open and close engine valve (12). Engine valve (12) is affixed to a valve piston (16) within a piston chamber (18). A volume (42) below piston (16) is connected to high pressure branch (68) and a volume (20) above piston (16) is selectively connected to the high pressure branch (68) or the low pressure branch (70) via a spool valve (34), to effect engine valve opening and closing. A motor (60) effects the movement of the spool valve (34).

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