Engine valve control system and method

Details Engine valve control system and method Engine valve control system and method

2007-01-25

2008-08-26

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

C251S129010, C251S129160

Reexamination Certificate

active

07415950

ABSTRACT:
A method of operating an engine having at least one cylinder, said cylinder including at least one electric valve actuator, said actuator including at least a coil and an armature moveable thereto, the method comprising during a non-firing state of the cylinder: holding the armature of the actuator at a first position away from an equilibrium position by supplying a first amount of current to a first coil of the actuator; and reducing current supplied to the first coil from said first amount to a lower second amount to cause the armature to begin moving toward the equilibrium position; and during a subsequent firing state of the cylinder, varying an amount of holding current supplied to the first coil for holding the armature away from the equilibrium position based on at least said second amount of current.

REFERENCES:
patent: 5991143 (1999-11-01), Wright et al.
patent: 6044814 (2000-04-01), Fuwa
patent: 6427651 (2002-08-01), Kemper et al.
patent: 6684854 (2004-02-01), Coldren et al.
patent: 6772737 (2004-08-01), Gaessler et al.
patent: 7270093 (2007-09-01), Luercho

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