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21 条记录 (耗时 0.013 秒)

    System for controlling a single control variable by proportioning a plurality of related manipulated variables
    3.
    发明授权
    System for controlling a single control variable by proportioning a plurality of related manipulated variables 失效
    通过分配大量相关操作变量来控制单一控制变量的系统

    公开(公告)号：US3691354A

    公开(公告)日：1972-09-12

    申请号：US3691354D

    申请日：1971-06-18

    申请人： LEEDS & NORTHRUP CO

    发明人： GREEN THOMAS A ,  ROSS CHARLES W

    IPC分类号： G05B13/02 ,  G05B15/02

    CPC分类号： G05B15/02 ,  G05B13/02

    摘要： A digital control system determines a control signal in accordance with proportional and integral control responses. The control signal is proportioned among a plurality of final control elements so as to modify related manipulated variables. The values of the manipulated variables are summed and that sum is similarly proportioned. The resulting individual portions are then compared with the value of the associated manipulated variable and the difference is added to the corresponding proportions of the control signal to correct the divergence of the response of the control elements from the desired proportioned response.

    Method and apparatus for controlling a process variable by manipulation of a selected one of two variables
    8.
    发明授权
    Method and apparatus for controlling a process variable by manipulation of a selected one of two variables 失效
    用于控制选择的两个变量之一可变的过程的方法和装置

    公开(公告)号：US3566091A

    公开(公告)日：1971-02-23

    申请号：US3566091D

    申请日：1966-09-02

    申请人： LEEDS & NORTHRUP CO

    发明人： BAY THEODOSIOS ,  ROSS CHARLES W

    IPC分类号： F27B7/42 ,  G05B11/42

    CPC分类号： F27B7/42 ,  G05B11/42

    摘要： A method and means for controlling a rotary kiln so as to maintain the desired temperature in the burning zone utilizes a selected one of two variables to effect the control. The burning zone temperature is controlled by controlling the speed of the kiln or by controlling the firing rate. The system is specifically designed to provide an arrangement for determining whether the control will be effected by a change in firing rate. Also, the amount of proportional action which is utilized in the control and the decision as to whether or not rate and reset action will be applied is determined by the logic of the system. An anticipatory control from CO is provided. The control system is so organized that proportional action may be doubled when the burning zone temperature is above or below a predetermined limit. Also, rate action is incorporated in the control only when the burning zone temperature is decreasing below a certain high limit or increasing above a certain low limit and reset action is utilized only within predetermined limits.

    Method for automatically detecting the presence of cyclic pulses in noise corrupted process measurements
    10.
    发明授权
    Method for automatically detecting the presence of cyclic pulses in noise corrupted process measurements 失效
    在噪声破坏过程测量中自动检测循环脉冲的存在方法

    公开(公告)号：US3681780A

    公开(公告)日：1972-08-01

    申请号：US3681780D

    申请日：1971-01-21

    申请人： LEEDS & NORTHRUP CO

    发明人： ROSS CHARLES W

    IPC分类号： G01R23/10 ,  H04B15/00 ,  G06F7/02 ,  G06F15/56

    CPC分类号： G01R23/10

    摘要： A method for detecting the presence of cyclic pulses in process measurements having a high noise content by incrementing a counter and initiating a new time interval when the difference between the minimum and maximum values of the process measurement exceed the expected magnitude of the cyclic pulses then decrementing the counter upon the expiration of a preset maximum duration for the time interval when the difference between the minimum and maximum has not reached the expected magnitude of the cyclic pulses. A count within a predetermined range of the maximum allowable count is then indicative of the presence of the cyclic pulses in the process measurement.

    摘要翻译： 一种用于通过增加计数器来检测具有高噪声含量的过程测量中循环脉冲的存在的方法，并且当过程测量的最小值和最大值之间的差超过循环脉冲的预期幅度然后递减时启动新的时间间隔 计数器在最小和最大值之间的差值未达到循环脉冲的预期幅度的时间间隔的预设最大持续时间期满时。 然后在最大允许计数的预定范围内的计数指示过程测量中循环脉冲的存在。