Pneumatic electronic valve actuator

Details Pneumatic electronic valve actuator Pneumatic electronic valve actuator

F - Mech Eng,Light,Heat,Weapons

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F01L 9/02 (2006.01) F01L 9/04 (2006.01) F01L 13/00 (2006.01)

Patent

CA 1314774

PHA 40536 16.11.1988 ABSTRACT PNEUMATIC ELECTRONIC VALVE ACTUATOR A bistable electronically controlled pneumatical- ly 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 there- from to be pneumatically driven to the other extreme posi- tion 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.

589492

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