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    • 83. 发明授权
      US3886420A Frequency responsive speed control apparatus 失效
    • Frequency responsive speed control apparatus
    • 频率响应速度控制装置
    • US3886420A
    • 1975-05-27
    • US39567473
    • 1973-09-10
    • GEN SIGNAL CORP
    • BUTLER WILLIAM K , HUGHSON J DONALD
    • B60K31/00 , B60K31/02 , B60L3/08 , B60T8/58 , B61L3/00 , G05D13/62 , H03H11/04 , H02P5/00
    • B61L3/002 , B60L3/08 , B60L2200/26 , Y02T10/7258 , Y10S388/902 , Y10S388/922
    • A speed control apparatus for sensing over speed conditions of a vehicle. A signal source which produces signals at a frequency which is proportional to vehicle speed feeds an electronic high pass filter whose cut-off frequency is variable and settable to a frequency which is proportional to the predetermined speed above which an over speed condition exists. A relay driver is operated in response to signals passed by the electronic high pass filter to operate a relay. In order to check the cut-off frequency of the high pass filter, a check oscillator is provided which is tuned to a frequency slightly in excess of the desired cut-off frequency of the high pass filter. The relay driver operates an electronic switch which intermittently provides the signals from the check oscillator to the electronic high pass filter. In operation, when the vehicle is under speed, the speed signals will not pass the electronic high pass filter and thus the relay driver is operated to one condition which enables the electronic switch to pass the check oscillator signals to the high pass filter. These signals, being at a frequency slightly in excess of the cut off frequency of the high pass filter, will pass through the filter and operate the relay driver to a second condition. Intermittent operation of the relay driver maintains the relay energized. This will cause the switch to open and the only signals passing to the high pass filter will be those generated by the signal source. The check oscillator provides for dynamic testing of the system and also provides a check on the cut-off frequency of the high pass filter. If that cut-off frequency rises, the check oscillator signal will not pass the high pass filter and thus the relay driver will not operate intermittently and this will cause the relay to drop away. In order to ensure a stable frequency from the check oscillator, it is operated continuously and a switch is provided to pass the check oscillator signals intermittently to the high pass filter. Furthermore, the check oscillator signals are introduced in such a manner that during those periods during which the check oscillator signals are fed to the electronic high pass filter, the signals from the signal source are ineffective.
    • 一种用于感测车辆的超速状况的速度控制装置。 以与车辆速度成比例的频率产生信号的信号源馈送电子高通滤波器，其截止频率可变并且可设置为与超过该速度条件的预定速度成比例的频率。 继电器驱动器响应于由电子高通滤波器通过的信号而操作继电器。 为了检查高通滤波器的截止频率，提供了一个检测振荡器，其被调谐到略高于高通滤波器的期望截止频率的频率。 继电器驱动器操作电子开关，其间歇地将来自检查振荡器的信号提供给电子高通滤波器。 在操作中，当车辆处于低速状态时，速度信号不会通过电子高通滤波器，因此继电器驱动器被操作到使电子开关能够将检查振荡器信号传递到高通滤波器的一个条件。 处于略高于高通滤波器的截止频率的频率的这些信号将通过滤波器并将继电器驱动器操作到第二状态。 继电器驱动器的间歇操作保持继电器通电。 这将导致开关打开，传递到高通滤波器的唯一信号将是信号源产生的信号。 检查振荡器提供系统的动态测试，并提供对高通滤波器截止频率的检查。 如果截止频率上升，则检查振荡器信号不会通过高通滤波器，因此继电器驱动器不会间歇地运行，这将导致继电器掉电。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 85. 发明授权
      US3560827A System for controlling the velocity and position of a rotating member 失效
    • System for controlling the velocity and position of a rotating member
    • 用于控制旋转成员的速度和位置的系统
    • US3560827A
    • 1971-02-02
    • US3560827D
    • 1969-05-09
    • SECURITY TRUST CO OF ROCHESTER
    • SCHILLER MICHAEL S
    • H02P23/00 , H02P7/70
    • H02P23/183 , Y10S388/912 , Y10S388/922
    • THERE IS DISCLOSED A SYSTEM FOR CONTROLLING THE ROTATIONAL VELOCITY AND PHASE (POSITION) OF A CONTINUOUSLY ROTATING DEVICE SUCH AS A MAGNETIC DRUM. A MEASUREMENT TRAIN OF PULSES IS COMPARED WITH A REFERENCE TRAIN OF PULSES IN A CLOSED LOOP TO LOCK THE ROTATIONAL VELOCITY OF THE DRUM TO THAT DICTATED BY THE FREQUENCY OF THE REFERENCE TRAIN. ONCE DURING EACH FULL ROTATION OF THE DRUM A MEASUREMENT INDEX PULSE IS PROVIDED. THIS MEASUREMENT INDEX IS COMPARED WITH A REFERENCE INDEX PULSE IN A CLOSE LOOP SYSTEM TO PROVIDE POSITIONING (PHASE) CONTROL OVER THE ROTATING DRUM. IN ORDER TO PROVIDE BOTH POSITION AND FREQUENCY CONTROL, SIDE BAND GENERATION IS PROVIDED USING THE REFERENCE SIGNAL FOR TGHE CENTER FREQUANCY. THE FREQUENCY OF THE MODULATING SIGNAL, AND THUS THE DEVIATION OF THE SIDE BAND FROM CENTER FREQUENCY, IS DETERMINED BY THE MAGNITUDE OF DISPLACEMENT BETWEEN MEASUREMENT INDEX SIGNAL AND THE REFERENCE INDEX SIGNAL. THE UPPER OR LOWER SIDE BAND IS SELECTED AS A FUNCTION OF THE DIRECTION OF DISPLACEMENT OF THE MEASUREMENT INDEX SIGNAL FROM THE REFERENCE INDEX SIGNAL. IN ANY CASE, WHEN THERE IS AN INDEX ERROR, A SIDE BAND SIGNAL IS EMPLOYED AS THE COMMAND SIGNAL. THIS COMMAND SIGNAL IS COMPARED WITH THE MAIN MEASUREMENT SIGNAL TO CAUSE THE DRUM TO SPEED UP OR SLOW DOWN UNTIL THE INDEX ERROR IS ELIMINATED. WHEN INDEX SYNCHRONIZATION IUS ACHIEVED, THE MAIN REFERENCE SIGNAL IS EMPLOYED AS THE COMMAND SIGNAL SO THAT THE FREQUENCY OF THE DRUM IS LOCKED TO THAT DICTATED BY THE MAIN REFERENCE SIGNAL. IN ADDITION, ONCE INDEX SYNCHRONIZATION HAS BEEN ACHIEVED, FURTHER POSITION CONTROL IS PROVIDED WITHIN THE SPAN OF A SINGLE MEASUREMENT SIGNAL PULSE BY VIRTUE OF A MODIFICATION TO THE WIDTH OF THE COMMAND SIGNAL PULSES BY AN AMOUNT IN A DIRECTION TENDING TO CAUSE MEASUREMENT SIGNAL PULSES AND MAIN REFERENCE SIGNAL PULSES TO BECOME COINCIDENT IN PHASE.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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