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    Electrohydraulic system
    2.
    发明公开
    Electrohydraulic system 失效
    电动系统

    公开(公告)号：EP0393697A3

    公开(公告)日：1991-01-23

    申请号：EP90107523.4

    申请日：1990-04-20

    申请人： VICKERS INCORPORATED

    发明人： Dahroug, Mohamed E. ,  El-Ibiary, Yehia M. ,  Gunda, Rajamouli ,  Smith, Paul M. ,  Silverthorn, Randall G.

    IPC分类号： G05B19/416 ,  F15B21/08 ,  B22D17/32

    CPC分类号： G05B19/416 ,  B22D17/32 ,  G05B2219/34215 ,  G05B2219/35312 ,  G05B2219/36171 ,  G05B2219/36513 ,  G05B2219/37133 ,  G05B2219/37313 ,  G05B2219/37333 ,  G05B2219/37399 ,  G05B2219/41301 ,  G05B2219/42123 ,  G05B2219/45244

    摘要： In a die casting machine that includes a shot cylinder having a ram for injecting metal into a die cavity, an electrohydraulic system for controlling operation of the shot cylinder includes an actuator coupled to the shot cylinder ram. A valve supplies hydraulic fluid to the actuator cylinder as a function of valve control signals. Microprocessor-based digital control electronics includes memory for storing a desired ram velocity profile as an incremental function of ram position. The control circuitry is responsive to signals from a sensor coupled to the actuator, indicative of position at the ram, for retrieving corresponding velocity signals from memory and supplying control signals to the valve as a function of such profile velocity signals. The control circuitry further includes facility for adjusting impact of the shot cylinder ram at the end of a cavity-filling stroke as a function of ram and actuator position and/or pressure, independently of the velocity/position profile, to reduce separation and flashing at the die cavity, and to reduce impact wear and fatigue on the overall die casting machine. A keyboard and associated operator display provide operator programmability and selection from a plurality of velocity/position profiles. The actuator and cylinder ram may be advanced in a manual mode of operation for adjustment and calibration proposes. A display associated with the keyboard graphically illustrates desired and actual velocity/position profiles during operation, together with a profile of actuator drive pressure verses position.

    Electrohydraulic system
    3.
    发明公开
    Electrohydraulic system 失效
    液压系统。

    公开(公告)号：EP0393697A2

    公开(公告)日：1990-10-24

    申请号：EP90107523.4

    申请日：1990-04-20

    申请人： VICKERS INCORPORATED

    发明人： Dahroug, Mohamed E. ,  El-Ibiary, Yehia M. ,  Gunda, Rajamouli ,  Smith, Paul M. ,  Silverthorn, Randall G.

    IPC分类号： G05B19/416 ,  F15B21/08 ,  B22D17/32

    CPC分类号： G05B19/416 ,  B22D17/32 ,  G05B2219/34215 ,  G05B2219/35312 ,  G05B2219/36171 ,  G05B2219/36513 ,  G05B2219/37133 ,  G05B2219/37313 ,  G05B2219/37333 ,  G05B2219/37399 ,  G05B2219/41301 ,  G05B2219/42123 ,  G05B2219/45244

    摘要： In a die casting machine that includes a shot cylinder having a ram for injecting metal into a die cavity, an electrohydraulic system for controlling operation of the shot cylinder includes an actuator coupled to the shot cylinder ram. A valve supplies hydraulic fluid to the actuator cylinder as a function of valve control signals. Microprocessor-based digital control electronics includes memory for storing a desired ram velocity profile as an incremental function of ram position. The control circuitry is responsive to signals from a sensor coupled to the actuator, indicative of position at the ram, for retrieving corresponding velocity signals from memory and supplying control signals to the valve as a function of such profile velocity signals. The control circuitry further includes facility for adjusting impact of the shot cylinder ram at the end of a cavity-filling stroke as a function of ram and actuator position and/or pressure, independently of the velocity/position profile, to reduce separation and flashing at the die cavity, and to reduce impact wear and fatigue on the overall die casting machine. A keyboard and associated operator display provide operator programmability and selection from a plurality of velocity/position profiles. The actuator and cylinder ram may be advanced in a manual mode of operation for adjustment and calibration proposes. A display associated with the keyboard graphically illustrates desired and actual velocity/position profiles during operation, together with a profile of actuator drive pressure verses position.

    摘要翻译： 在包括具有用于将金属注入模腔的冲头的喷射缸的压铸机中，用于控制喷射气缸的操作的电动液压系统包括联接到喷射缸柱塞的致动器。 阀门作为阀门控制信号的一个功能，向致动器气缸提供液压流体。 基于微处理器的数字控制电子设备包括用于存储所需的冲击速度轮廓作为推杆位置的增量功能的存储器。 控制电路响应于来自耦合到致动器的传感器的信号，指示压头处的位置，用于从存储器检索相应的速度信号，并根据这种轮廓速度信号向阀提供控制信号。 控制电路还包括用于在空腔填充冲程结束时调节喷射缸压头的冲击作为压头和致动器位置和/或压力的函数的功能，独立于速度/位置分布，以减少分离和闪烁在 模腔，并减少整体压铸机的冲击磨损和疲劳。 键盘和相关联的操作者显示器提供操作者可编程性和从多个速度/位置轮廓中的选择。 致动器和气缸柱塞可以在手动操作模式下进行，用于调节和校准。 与键盘相关联的显示器图形地示出了操作期间的期望和实际的速度/位置曲线，以及致动器驱动压力与位置的轮廓。

    Power servo system
    5.
    发明公开
    Power servo system 失效
    Leistungsservosystem。

    公开(公告)号：EP0274046A1

    公开(公告)日：1988-07-13

    申请号：EP87117430.6

    申请日：1987-11-26

    申请人： Vickers Incorporated

    发明人： El-Ibiary, Yehia M. ,  Leemhuis, Richard S.

    IPC分类号： G05B13/02 ,  G05B19/19

    CPC分类号： G05B19/19 ,  G05B13/0245 ,  G05B2219/41202 ,  G05B2219/41204 ,  G05B2219/41205 ,  G05B2219/41278 ,  G05B2219/41318 ,  G05B2219/41434 ,  G05B2219/42256

    摘要： A power servo system which includes an actuator (12) coupled to a load and receives an input command signal (Y) indicative of desired motion at the load. A sampled-data control system (20) receives and samples input signals indicative of desired and actual motion at the hydraulic actuator (12) and load, and provides control signals ( U(Z) ) to the actuator necessary to obtain desired motion. The sampled-data control system includes digital processing circuitry with series ( 32 a ) and feedback compensation ( 28 a ) coordinated with the hydraulic system transfer function, to form a complete closed-loop control system operating in the sampled-data or Z-transform domain. Different equation constants in the series and feedback compensation circuitry ( 28 a , 32 a ) are recalculated periodically. Such constants can be recalculated as a function of system behavior, so that system control automatically varies with operating conditions, or constants are calculated based upon a single operator-variable (or remote system) input, which accommodates rapid operator-implemented tracking of system behavior while reducing calculation time. Static gain can be selected independently of other variables.

    摘要翻译： 一种功率伺服系统，其包括耦合到负载的致动器（12）并且接收指示负载期望的运动的输入命令信号（Y）。 采样数据控制系统（20）在液压致动器（12）处接收并采样表示期望和实际运动的输入信号并加载，并且向执行器提供控制信号（U（Z）），以获得所需运动所需的运动。 采样数据控制系统包括与液压系统传递功能协调的串联（32a）和反馈补偿（28a）的数字处理电路，以形成在采样数据或Z变换中工作的完整的闭环控制系统 域。 系列和反馈补偿电路（28 a，32 a）中的不同方程常数被周期性地重新计算。 这些常数可以作为系统行为的函数进行重新计算，以便系统控制自动随操作条件而变化，或常数是基于单个操作员变量（或远程系统）输入计算的，这些输入可以适应快速操作员实现的系统行为跟踪 同时减少计算时间。 可以独立于其他变量选择静态增益。