公开(公告)号：US5942892A

公开(公告)日：1999-08-24

申请号：US944791

申请日：1997-10-06

申请人： Long-Jang Li

发明人： Long-Jang Li

IPC分类号： F16K31/06 ,  H01F7/16 ,  H01F7/18 ,  G01B7/14 ,  F16K37/00 ,  G01R27/16

CPC分类号： H01F7/1844 ,  H01F2007/1855 ,  Y10T137/8242

摘要： An apparatus detects a position of an armature within a solenoid coil by superimposing a fixed frequency sensing signal onto the coil driver signal. The combined signal is applied to the solenoid coil and an alternating current component varies with changes in inductance of the solenoid coil that result from position changes of the armature. A current sensor produces an output signal indicating a level of current flowing through the solenoid coil and a filter extracts the alternating component of that output signal that results from the sensing signal. A position circuit determines the position of the armature from an output from the filter.

摘要翻译： 装置通过将固定频率感测信号叠加在线圈驱动器信号上来检测电枢在螺线管线圈内的位置。 组合的信号被施加到螺线管线圈，并且交流分量随着电枢的位置变化导致的螺线管线圈的电感的变化而变化。 电流传感器产生指示流过螺线管线圈的电流水平的输出信号，并且滤波器提取由感测信号产生的该输出信号的交替分量。 位置电路从过滤器的输出确定衔铁的位置。