Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1996-11-12
1997-12-02
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, 25112916, 25112918, F01L 904
Patent
active
056924631
ABSTRACT:
An electromechanically actuated valve (12) for use as an intake or exhaust valve in an internal combustion engine. The valve (12) is actuated by a electromechanical actuator assembly (18) which includes a first electromagnet (22), second electromagnet (30) and third electromagnet (32). A disk (38) is fixedly mounted to the valve (12) in a gap between the second and third electromagnets. The second electromagnet (30) is slidable between the first electromagnet (22) and a stop (42), allowing the gap between the second electromagnet (30) and the third electromagnet (32) to vary. This allows for multiple valve lifts. A second spring (50), mounted between the second electromagnet (30) and disk (38), and a third spring (32), mounted between the disk (44) and an actuator housing (20), create a balanced oscillatory system which drives most of the valve movement during engine operation, thus reducing power requirements to actuate the valves while increasing the responsiveness of the valves.
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Liang Feng
Stephan Craig Hammann
Ford Global Technologies Inc.
Lo Weilun
Wilkinson Donald A.
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