Hydraulic valve actuation systems and methods
    45.
    发明申请
    Hydraulic valve actuation systems and methods 失效
    液压阀驱动系统及方法

    公开(公告)号:US20030015155A1

    公开(公告)日:2003-01-23

    申请号:US10164046

    申请日:2002-06-05

    Abstract: Hydraulic engine valve actuation systems and methods for internal combustion engines. The systems utilize a proportional valve to regulate the flow of a working fluid to and from a hydraulic actuator controlling the engine valve position. The position of the proportional valve is controlled by one or more high speed valves to control various engine valve parameters, including engine valve takeoff and landing velocities. Returning all valves to a known starting position between engine valve events avoids accumulation of errors in proportional valve positioning. Embodiments using spool valves for the high speed valves and the proportional valve, and spring return and hydraulic return for the engine valve, are disclosed. A specially shaped spool in the proportional valve provides enhanced control over the engine valve operation. Various further alternate embodiments are disclosed.

    Abstract translation: 液压发动机气门驱动系统和内燃机的方法。 该系统利用比例阀来调节工作流体与控制发动机气门位置的液压致动器的流动。 比例阀的位置由一个或多个高速阀控制,以控制各种发动机气门参数,包括发动机气门起飞和着陆速度。 将所有阀门返回到发动机气门事件之间的已知起始位置可避免比例阀定位中的误差累积。 公开了使用用于高速阀和比例阀的滑阀以及用于发动机气门的弹簧复位和液压返回的实施例。 比例阀中的特殊形状的阀芯可以增强对发动机气门操作的控制。 公开了各种另外的替代实施例。

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