Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1988-08-15
1990-03-13
Dolinar, Andrew M.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
361156, 361192, 361194, 335234, H01F 718
Patent
active
049087312
ABSTRACT:
A bistable electromechanical transducer is disclosed having an armature reciprocable between first and second positions, a permanent magnet latching arrangement for maintaining the armature in the respective positions, and an electromagnetic repulsion arrangement operable when energized to dislodge the armature from the position in which the armature was maintained and causing it to move to the other of the positions. In a preferred embodiment, the transducer takes the form of an electronically controllable valve mechanism for use in an internal combustion engine and has an engine valve with an elongated valve stem along with the electromagnetic repulsion arrangement for causing the valve to move in the direction of stem elongation between valve-open and valve-closed positions. An arrangement for decelerating the valve as the valve nears the respective valve-open and valve-closed positions includes at least two separate damping arrangements jointly effective to slow valve motion as the valve gets close to said one position. The damping may include dynamic breaking and energy recovery. The mechanism may also include a housing at least partially surrounding the valve stem and an arrangement for circulating the engine liquid coolant through a portion of the housing.
REFERENCES:
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patent: 3514674 (1970-05-01), Ito et al.
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patent: 4392632 (1983-07-01), Gast et al.
patent: 4533890 (1985-08-01), Patel
patent: 4661883 (1987-04-01), Nishizako et al.
Briody Thomas A.
Dolinar Andrew M.
Magnavox Government and Industrial Electronics Company
Rickert Roger M.
Seeger Richard T.
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