发明授权
- 专利标题: Magnetic-effect sensing apparatus with signal thresholding
- 专利标题(中): 具有信号阈值的磁效应传感器
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申请号: US10631850申请日: 2003-07-24
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公开(公告)号: US06727689B1公开(公告)日: 2004-04-27
- 发明人: Greg R. Furlong , Joel D. Stolfus , Jason M. Chilcote , Scott L. Bunyer
- 申请人: Greg R. Furlong , Joel D. Stolfus , Jason M. Chilcote , Scott L. Bunyer
- 主分类号: G01P3489
- IPC分类号: G01P3489
摘要:
An apparatus and method for detecting gear features is provided. The apparatus includes a magnetic-sensing element, a thresholding module, and an output module. The magnetic-sensing element may provide a sensor-output signal indicative of the presence of a gear feature. The thresholding module may (i) transform the sensor-output signal into a characteristic waveform, which is also indicative of the presence of the gear feature; (ii) detect a first difference between the characteristic waveform and a reference signal, and responsively provide a tracking signal that tracks this difference; and (iii) detect a second difference between the tracking and reference signals, and responsively adjust the sensor-output signal. Adjustment may be performed (i) as a function of the second difference when it falls below a given threshold and (ii) by a predetermined amount when the second difference satisfies the given threshold. The output module may produce an output signal as a function of the characteristic waveform and the reference signals.