Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2007-11-13
2007-11-13
Leja, Ronald W. (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
Reexamination Certificate
active
10838903
ABSTRACT:
Systems and methods for valve actuation use series-connected coils of upper and lower electromagnets acting as electromagnetic generators that attempt to maintain a constant magnetic flux, while their forces are essentially independent. A valve controller initiates valve actuation by reducing holding force of the holding electromagnet. As spring force begins to move an armature away from the holding electromagnet, the associated coil generates a voltage that attempts to maintain constant flux. This generated voltage causes a large increase in current that essentially transfers the flux to the other on-coming coil, which attracts and holds the armature against its associated spring force to open or close the valve. The internal voltage generated inside the two coils operates even if the coils are supplied with zero external voltage (shorted) to transfer stored energy directly between the coils. Energy may be transferred indirectly using an energy storage device.
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Gunselmann, CH. and Melbert, J.—“Improved Robustness and Energy Consumption for Sensorless Electromagnetic Valve Train”, SAE Technical Bulletin 2003-01-0030, reprinted from Variable Valve Actuation 2003 (SP-1752/SP-1752CD), Mar. 2003, 10 pages.
Bir David S.
Bir Law, PLC
Ford Global Technologies LLC
Leja Ronald W.
Lippa Allan J.
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