Pneumatic actuator with solenoid operated control valves

Details Pneumatic actuator with solenoid operated control valves Pneumatic actuator with solenoid operated control valves

1988-06-20

1989-10-17

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

123 9014, 91465, 13762564, F01L 902, F01L 904

Patent

active

048739480

ABSTRACT:
A bistable electronically controlled pneumatically powered transducer for use, for example, as a valve mechanism actuator in an internal combustion engine is disclosed. The transducer has an armature including a piston which is coupled to an engine valve, for example. The piston is powered by a pneumatic source and includes asymmetric pneumatic damping. Air damping may be differentially controlled to provide dissimilar damping at the two extremes of piston motion. The armature is held in each of its extreme positions by pneumatic pressure under the control of control valves which are in turn held in their closed positions by pressurized air latching arrangements and are released therefrom to supply air to the piston to be pneumatically driven to the other extreme position by an electromagnetic solenoid or by an electromagnetic repulsion arrangement. The control valves may be spring loaded toward their open positions.

REFERENCES:
patent: 2552960 (1951-05-01), Grieshaber et al.
patent: 4074699 (1978-02-01), Stampfli
patent: 4257573 (1981-03-01), Stampfli
patent: 4605197 (1986-08-01), Casey et al.

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