| 摘要 |
A hydraulic valve actuator system for an internal combustion engine in which an engine driven pump means supplies fluid, at high pressure, sequentially to an N number of outlets, each outlet being connected by a check valve and a fluid delivery conduit to an associated actuator means for a poppet valve in a set of N number of poppet valves for the engine, each actuator means including an actuator plunger reciprocably journaled in an actuator cylinder with one end of the actuator plunger positioned for abutment against the stem of an associated poppet valve that is normally held closed by an associated valve return spring. Each fluid delivery conduit is also connected via a drain conduit to a fluid reservoir used to supply fluid at a predetermined supply pressure to the inlet of the pump means, flow from each delivery conduit through its associated drain conduit being controlled by an associated normally open, solenoid valve connectable to an electric control circuit whereby each solenoid valve can be sequentially energized as a function of engine operating perimeters.
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