Variable actuation of engine valves

Details Variable actuation of engine valves Variable actuation of engine valves

1999-05-24

2000-02-22

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9011, F01L 902

Patent

active

060267712

ABSTRACT:
This invention pertains to a variable actuation system for engine valves. It is based on the natural oscillatory motion of two, hydrostatically coupled masses. One mass consists of an engine valve having a piston at the tip of its stem, the other mass consists of a spring-sprung master piston that is electromagnet-controlled at each end of travel. Separate half cycles of essentially sinusoidal motion of the couples masses are initiated and terminated by alternately releasing and capturing the spring driven master piston at its peak amplitudes which corresponds to the open and closed positions of the valve.

REFERENCES:
patent: 4244553 (1981-01-01), Escobosa
patent: 4296911 (1981-10-01), Escobosa
patent: 4829947 (1989-05-01), Lequesne
patent: 4930464 (1990-06-01), Letsche
patent: 5222714 (1993-06-01), Morinigo et al.
patent: 5335633 (1994-08-01), Thien
patent: 5410994 (1995-05-01), Schechter
patent: 5572961 (1996-11-01), Schechter et al.

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