发明名称 |
Absolute position detection method for stroke sensing cylinder |
摘要 |
An improved absolute position detection method is provided for a stroke sensing cylinder which includes a magnetic scale detecting step for obtaining a plurality of sine wave form voltages having different phases using a magnetic sensor unit in accordance with a driving operation of the cylinder. A wave form generation step is also provided for converting the sine wave form voltage obtained in the magnetic scale detection step into a square wave form and generating a triangle wave form having the same period as the thusly converted square wave form. A first absolute position value detection and stroke direction judging step is then provided for judging a first absolute position value and stroke direction of the cylinder using a pair of square and triangle wave forms generated in the wave form generation step. Lastly, a second absolute position value computation and storing step is provided for computing and storing a second absolute position value having a predetermined value based on the first absolute position value. The method of the present invention is directed to detecting a magnetic flux change of a magnetic scale using a plurality of magnetic sensors. The magnetic scale is disposed along the cylinder rod and includes at least one different magnetic scale processing period contained within a regularly protruded and recessed portion. Signal-processing is achieved using a microprocessor and a 1/N-dividing counter. The thusly signal-processed wave forms are counted and an absolute position and stroke direction is determined.
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申请公布号 |
US5918199(A) |
申请公布日期 |
1999.06.29 |
申请号 |
US19970998986 |
申请日期 |
1997.12.29 |
申请人 |
VOLVO CONSTRUCTION EQUIPMENT KOREA CO., LTD. |
发明人 |
YANG, SOON YONG;LEE, MAN HYUNG;LEE, MIN CHEOL |
分类号 |
G01B7/00;E02F9/26;F15B15/28;G01D5/14;G01D5/249;(IPC1-7):G01B7/00 |
主分类号 |
G01B7/00 |
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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