ELECTRIC ACTUATOR FOR ROTARY VALVE CONTROL OF ELECTROHYDRAULIC VALVETRAIN

摘要

An engine valve assembly (10) within an electrohydraulic camless valvetrain cooperates with a hydraulic system (9) 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 rotary valve (34), to effect engine valve opening and closing. A four pole, single phase motor (60) effects the movement of the rotary valve (34) and is actuated by a drive circuit (92). some of the electrical energy spent by drive circuit (92) to accelerate motor (60) is recovered by energy recovery components (102).