| 摘要 |
A system for controlling the operation of combustion chamber valves in an internal combustion engine wherein the opening and closing commands originate from an engine management system and which system employs hydraulic or pneumatic operation wherein a power piston (5) is adapted to move within a power cylinder (3) via the action of motive means, such as a crank or a cam (2) which continually rises and then falls on each rotation, said power piston (5) having a larger diameter and/or stroke than the piston(s) (18) of an associated slave cylinder(s) (17) which, in turn, opens and closes the valve(s) (19) in the cylinder head, and further wherein pressure to open the valve(s) (19) in the cylinder head against the pressure exerted on the valve by biasing means is controlled until a controlled shut-off means (15) closes a passage (16) and stops flow of fluid to allow sufficient pressure to build to open said valve and where fluid spills from the power cylinder (3) against a source of fluid (30) under lower pressure than the pressure within the power cylinder, until the controlled shut-off means (15) closes the passage (16), preventing such spill.
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