Pneumatic bistable electronic valve actuator

Details Pneumatic bistable electronic valve actuator Pneumatic bistable electronic valve actuator

1988-02-08

1989-11-07

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

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

Patent

active

048784648

ABSTRACT:
A bistable electronically controlled pneumatically powered transducer for use, for example, as a valve mechanism in an internal combustion engine is disclosed. The transducer armature, an engine valve, for example, is powered by a pneumatic source and includes pneumatic damping and energy recovery as it nears its destination position. The armature is held in each of its extreme positions by a permanent magnet latching arrangement and is released therefrom to be pneumatically driven to the other extreme position by an electromagnetic arrangement which temporarily neutralizes the permanent magnetic field of the latching arrangement. A multiplicity of engine operating modes are also disclosed including operation of an engine in a six stroke cycle mode, and a unique intake valve timing scheme where the intake valve closure is delayed beyond bottom dead center of its associated cylinder with the delay being greater at lower engine speeds and less at higher engine speeds.

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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