Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1996-11-12
1998-06-16
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, 25112916, 25112918, F01L 904
Patent
active
057655138
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 first disk (38) is fixedly mounted to the valve (12) in a gap between the first and second electromagnets, and a second disk (44) is slidably mounted to the valve (12) above the third electromagnet (32) with a stop member (40) limiting its travel toward the first disk (38). With the valve (12) being in a closed position, the gap between the first disk (38) and the first electromagnet (22) is greater than the gap between the second disk (44) and third electromagnet (32), allowing for multiple valve lifts. A first spring (48), mounted between the cylinder head (14) and first disk (38), and a second spring (50), mounted between the second disk (44) and an actuator housing (20), create an 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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Control of Engine Load via Electromagnetic Valve Actuators, SAE 94-0816, The Engineering Society for Advancing Mobility Land Sea Air and Space, Feb. 28-Mar. 3, 1994.
Diehl Roy Edward
Liang Feng
Miller John Michael
Xu Xingyi
Ford Global Technologies Inc.
Lo Weilun
Wilkinson Donald A.
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