Velocity-based method for controlling an electrohydraulic proportional control valve
    3.
    发明公开
    Velocity-based method for controlling an electrohydraulic proportional control valve 审中-公开
    用于控制电液比例控制阀的基于速度的方法

    公开(公告)号:EP1403524A2

    公开(公告)日:2004-03-31

    申请号:EP03255950.2

    申请日:2003-09-23

    发明人: Tabor, Keith A.

    IPC分类号: F15B9/09 G05B19/43

    摘要: An actuator (16) is part of a hydraulic circuit branch that has a first electrohydraulic proportional valve (21) connecting the actuator to a supply line containing pressurized fluid and a second electrohydraulic proportional valve connecting the actuator to a tank return line (24). A method for operating the valves includes requesting a desired velocity for the hydraulic actuator (16) and sensing a parameter which varies with changes of a force on the actuator. The desired velocity and the parameter are used to derive an equivalent flow coefficient which characterizes fluid flow in the hydraulic circuit. From the equivalent flow coefficient, first and second valve flow coefficient are derived and then employed to activate each of the first and second electrohydraulic proportional valves (21,24). The coefficients may characterize either conductance or restriction in the respective part of the hydraulic system (10).

    摘要翻译: 致动器(16)是液压回路分支的一部分,其具有将致动器连接到包含加压流体的供应管线的第一电动液压比例阀(21)以及将致动器连接到罐返回管线(24)的第二电动液压比例阀。 用于操作阀的方法包括为液压致动器(16)请求期望的速度并且感测随着致动器上的力的变化而变化的参数。 期望的速度和参数被用于导出表征液压回路中的流体流动的等效流量系数。 根据等效流量系数,导出第一和第二阀流量系数,然后用于激活第一和第二电动液压比例阀(21,24)中的每一个。 系数可以表征液压系统(10)的相应部分中的电导或限制。

    Operating system for a programmable controller of a hydraulic system
    5.
    发明公开
    Operating system for a programmable controller of a hydraulic system 审中-公开
    液压系统可编程控制器的操作系统

    公开(公告)号:EP1445674A2

    公开(公告)日:2004-08-11

    申请号:EP03255947.8

    申请日:2003-09-23

    IPC分类号: G05B19/042

    摘要: A programmable controller, for operating a machine such as one having a hydraulic system, includes a memory that stores a plurality of software function routines. A memory contains a first data file with address pointers to the function routines where the address pointers are listed in the order that the function routines may be executed. A second data file has a separate record associated with each of the address pointers and each record identifies the data variables required by the corresponding function routine. A third data file contains information about each of the variables. A code sequencer accesses the first data file and directs execution of the function routine in the order designated by the pointers. As each function routine executes, the respective record in the second data file is used to access the required variable information.

    摘要翻译: 用于操作诸如具有液压系统的机器的可编程控制器包括存储多个软件功能例程的存储器。 存储器包含第一个数据文件,其中包含地址指针,指向函数例程,其中地址指针按照函数例程执行的顺序列出。 第二个数据文件具有与每个地址指针相关的单独记录,并且每个记录标识相应功能例程所需的数据变量。 第三个数据文件包含有关每个变量的信息。 代码排序器访问第一个数据文件并按指针指定的顺序指示函数例程的执行。 随着每个函数例程的执行,第二个数据文件中的相应记录被用于访问所需的变量信息。