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    • 3. 发明授权
    • Method of controlling a hydraulic actuator
    • US08434398B2
    • 2013-05-07
    • US12385377
    • 2009-04-07
    • Benoit Dutilleul
    • Benoit Dutilleul
    • F01L25/08G01M7/00
    • F15B9/09F15B19/007
    • A control method for controlling a hydraulic actuator to impart oscillatory excitation to a load, the actuator comprising at least one hydraulic chamber and a movable member capable of moving in said chamber between two extreme positions under the action of a liquid under pressure, wherein the method comprises the steps consisting in: determining an operating point for said actuator, which operating point corresponds to a rest position of said movable member; applying a hydraulic command to bring said movable member into correspondence with said rest position; and applying a hydraulic command to cause said movable member to perform reciprocating movement about said rest position, said reciprocating movement being adapted to apply a desired excitation to said load; the rest position of said movable member being selected to be significantly off-center relative to said extreme positions. Advantageously, said rest position is selected to be as close as possible to one of said extreme positions of the movable member, taking account of the movement amplitude required of the piston to impart a desired excitation to said load.
    • 4. 发明授权
    • Hydraulic drive system and diagnostic control strategy for improved operation
    • 液压驱动系统及诊断控制策略,改善运行
    • US08240241B2
    • 2012-08-14
    • US12753822
    • 2010-04-02
    • Greg Batenburg
    • Greg Batenburg
    • F01L25/08F15B11/10F04B49/02
    • F15B21/08F15B11/08F15B2211/327F15B2211/6309F15B2211/633
    • A method and apparatus are provided for hydraulic fluid supply between a hydraulic pump and a hydraulic drive unit, switching hydraulic fluid flow direction to the hydraulic drive unit or stopping hydraulic fluid flow to the hydraulic drive unit when measured hydraulic fluid pressure crosses a predetermined pressure threshold value. The method further comprises calculating an amount of mechanical work done by the hydraulic drive unit and warning an operator or limiting hydraulic fluid flow rate to the hydraulic drive unit when the calculated mechanical work for the drive cycle is less than an expected amount of mechanical work. The apparatus for practicing the method further includes a pressure sensor associated with a hydraulic fluid supply conduit between the pump and the drive unit, and an electronic controller programmed to operate the drive system according to the method.
    • 提供一种方法和装置,用于在液压泵和液压驱动单元之间提供液压流体供应,当测量的液压流体压力超过预定压力阈值时,将液压流体流动方向切换到液压驱动单元或停止液压流体流向液压驱动单元 值。 该方法还包括当所计算的驱动循环的机械作业小于机械作业的预期量时,计算由液压驱动单元完成的机械作业的量并警告操作者或限制液压驱动单元的液压流体流量。 用于实施该方法的装置还包括与泵和驱动单元之间的液压流体供应管道相关联的压力传感器,以及被编程为根据该方法操作驱动系统的电子控制器。
    • 7. 发明授权
    • Exhaust valve for a gas expansion system
    • 用于气体膨胀系统的排气阀
    • US5211372A
    • 1993-05-18
    • US728544
    • 1991-07-11
    • Joseph L. Smith, Jr.
    • Joseph L. Smith, Jr.
    • F16K31/06F01L25/08F01L35/00F25B9/14
    • F01L35/00F01L25/08F25B9/14
    • A exhaust valve for use in a cryogenic gas expansion system which uses a non-metallic valve seat and a metallic valve disk assembly which is moved into and out of contact with the valve seat to close and open the valve, respectively. The valve disk assembly has a valve disk element, a number of spring elements, and a ring element, all of which are integrally formed from a single metallic sheet. The valve disk element moves with a non-linear, snap action movement which movement is controlled by a cryogenic solenoid. When the disk element is moved out of seated contact with the valve seat and reaches a position just past the point at which the snap action has commenced, the movement is limited by a stop element so that the force, and hence the solenoid current, required to hold the valve open at that position is minimized.
    • 一种用于低温气体膨胀系统的排气阀,其使用非金属阀座和金属阀盘组件,所述金属阀盘组件分别与所述阀座移动和脱离接触以关闭和打开所述阀。 阀盘组件具有阀盘元件,多个弹簧元件和环形元件,它们都由单个金属片整体形成。 阀盘元件以非线性的快速动作运动移动,该运动由低温螺线管控制。 当磁盘元件移动离开与阀座的就位触点并且到达刚刚超过快速动作已经开始的点的位置时,移动被止动元件限制,使得所需的力以及因此的电磁线圈电流被要求 在该位置保持阀打开最小化。
    • 8. 发明授权
    • Expansible chamber device having variably restrained valve systems
    • 具有可变限制阀系统的可膨胀室装置
    • US5111843A
    • 1992-05-12
    • US596943
    • 1990-10-11
    • Thomas R. GlassWeldon R. Hudson
    • Thomas R. GlassWeldon R. Hudson
    • F01B17/00F01L23/00F01L25/02F01L25/08
    • F01L25/02F01B17/00F01L23/00F01L25/08Y10T137/7846Y10T137/7869
    • In accordance with an illustrative embodiment of the present invention, an expansible chamber device includes a piston movable within a cylinder, a head on the cylinder having intake and exhaust ports, a normally-open intake valve for closing the intake port automatically when the flow rate or velocity of a working medium entering the cylinder reaches a predetermined value, variable restraining means for inhibiting closing of the intake valve in response to flow, an exhaust valve for preventing excape of working medium from the cylinder until cylinder pressure is reduced to a set level, spring means for opening the exhaust valve at that level, and means operable near the top-dead-center position of the piston for automatically opening the intake valve and for closing the exhaust valve to enable the cycle to repeat. A unique system for controlling the variable restraining means, as well as methods for regulating the flow or working medium through said valves, also is disclosed.
    • 根据本发明的说明性实施例,可膨胀室装置包括可在气缸内移动的活塞,具有进气和排气口的气缸上的头部,用于当流量自动关闭进气口的常开进气阀 或进入气缸的工作介质的速度达到预定值,用于响应于流动阻止进气门的关闭的可变限制装置,用于防止工作介质从气缸中被排出的排气阀,直到气缸压力降低到设定水平 用于打开该级别的排气阀的弹簧装置,以及可在活塞的上止点位置附近操作的装置,用于自动打开进气门并关闭排气门以使循环重复。 公开了用于控制可变约束装置的独特系统,以及通过所述阀调节流动或工作介质的方法。