Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Reexamination Certificate
2005-09-27
2005-09-27
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
C123S090150, C123S090240, C251S129070, C251S129090, C251S129150, C251S129160, C251S129180, C335S266000, C335S268000, C335S269000, C361S159000, C361S189000
Reexamination Certificate
active
06948461
ABSTRACT:
A system and method for controlling an internal combustion engine provide valve actuation that selectively couples an energy storage device to a launching coil to recover energy stored in the magnetic field and valve spring of the launching coil, decouples the energy storage device during a valve opening or closing event to control energy supplied to the catching coil, and couples the energy storage device to the catching coil to transfer energy from the storage device to the catching coil to provide a repeatable soft landing. A nonlinear feedback controller incorporates a feedforward system with an observer to control the rate of energy into the magnetic field of the catching coil while compensating for system losses and work to overcome gas forces within the combustion chamber. Feedback linearization techniques improve stability of the control system.
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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
Denion Thomas
Lewis Donald J.
Riddle Kyle M.
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