Data processing: measuring – calibrating – or testing – Measurement system – Orientation or position
Patent
1997-12-29
1999-06-29
Barlow, John
Data processing: measuring, calibrating, or testing
Measurement system
Orientation or position
702158, 702166, 364182, 36447435, G01B 700
Patent
active
059181990
ABSTRACT:
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.
REFERENCES:
patent: 4951048 (1990-08-01), Ichikawa et al.
patent: 5299143 (1994-03-01), Hellinga et al.
patent: 5461311 (1995-10-01), Nakazato et al.
patent: 5497083 (1996-03-01), Nakazato et al.
Lee Man Hyung
Lee Min Cheol
Yang Soon Yong
Barlow John
Vo Hien
Volvo Construction Equipment Korea Co., Ltd.
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