Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1987-08-12
1988-10-25
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112910, 335234, F01L 904
Patent
active
047795824
ABSTRACT:
A valve member is latched into open or closed positions by permanent magnetic poles against the force of compressed springs. A coil associated with each position, when activated with a current, cancels the magnetic field of the permanent magnetic pole holding the valve member and allows the compressed spring to move the member quickly through a central neutral position toward the other position, whereupon it is attracted by the other magnetic pole to compress the other spring and latch into the other position. Variations on the basic invention include different structures for single valves, the inclusion of two valves within a single pair of coils with different opening current levels, and the use of the coil opposite the activating coil as a valve member movement sensing device.
REFERENCES:
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patent: 3504315 (1970-08-01), Stanwell
patent: 3853102 (1974-12-01), Myers et al.
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SAE Paper No. 790119 Entitled "Helenoid Actuators--A New Concept in Extremely Fast Acting Solenoids", pp. 1-3. (2/26-3/2 '79).
Cross E. Rollins
General Motors Corporation
Sigler Robert M.
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