发明名称 |
SYSTEM AND METHOD OF MAGNETICALLY SENSING POSITION OF A MOVING COMPONENT |
摘要 |
A position-sensing system magnetically senses the position of a piston rod moving with respect to a cylinder. A magnetically hard layer on the piston rod provides a recording medium. Information is magnetically recorded in regions of the magnetically hard layer. These regions provide a relative encoding scheme for determining the position of the piston rod. Magnetic-field sensors are positioned over redundant tracks of magnetically recorded regions. Each magnetic-field sensor positioned over a given track senses the same magnetized regions while the piston rod moves with respect to the cylinder. Other magnetic-field sensors can sense ambient fields for use in performing common-mode rejection. A write head can dynamically repair damaged or erased regions detected by the magnetic-field sensors. Energized by a battery-backup power source, the magnetic-field sensors and associated circuitry can continue to track piston rod movement when the machinery is off. |
申请公布号 |
CA2604815(C) |
申请公布日期 |
2014.06.17 |
申请号 |
CA20062604815 |
申请日期 |
2006.02.28 |
申请人 |
SRI INTERNATIONAL |
发明人 |
ARNS, DONALD C.;GARCIA, PABLO |
分类号 |
G01D5/14;F15B15/28;G01D5/16 |
主分类号 |
G01D5/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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