Electric actuator for spool valve control of electrohydraulic va

Details Electric actuator for spool valve control of electrohydraulic va Electric actuator for spool valve control of electrohydraulic va

1995-01-06

1995-10-10

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9011, F01L 902

Patent

active

054562236

ABSTRACT:
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 spool valve (34) , to effect engine valve opening and closing. A four pole, single phase motor (60) effects the movement of the spool 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).

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