Electromagnetically operated valve driving system

Internal-combustion engines – Poppet valve operating mechanism – Electrical system

Patent

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123 9024, F01L 904

Patent

active

057822115

ABSTRACT:
An electromagnetically operated valve driving system for driving an intake or exhaust valve of an engine comprises an opening solenoid, a closing solenoid, and a control apparatus for energizing or deenergizing these opening and closing solenoids. Springs are provided in order to balance a valve body on a specified position between the fully open and fully closed positions. Further, when the intake or exhaust valve is closed, the closing solenoid is deenergized for a very short time immediately before the intake or exhaust valve is fully closed so as to reduce a traveling speed of the valve body when said valve body is seated. Also, when the intake or exhaust valve is opened, the opening solenoid is deenergized for a very short time immediately before the intake or exhaust valve is fully opened so as to reduce a traveling speed of the valve body when the valve body is fully opened.

REFERENCES:
patent: 4955334 (1990-09-01), Kawamura
patent: 5125370 (1992-06-01), Kawamura
patent: 5671705 (1997-09-01), Matsumoto et al.

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