Measuring and testing – Testing of apparatus
Patent
1997-12-29
1999-05-18
Dombroske, George
Measuring and testing
Testing of apparatus
73116, G01M15/00
Patent
active
059052155
ABSTRACT:
A method for detecting the direction and displacement of a rod member of a hydraulic cylinder assembly is provided. The hydraulic cylinder assembly includes a plurality of magnetic sensors for outputting a magnetic field variation signal disposed adjacent a hydraulic cylinder. The plurality of magnetic sensors cooperate with a plurality of magnetic projections equally spaced along a rod member for producing the magnetic field variation signal. The signal is converted from a sine wave into a square wave by using a microprocessor. The edges of the converted square wave are counted to accurately detect a direction and displacement amount. The method further includes the steps of ignoring a square wave edge caused by disturbance, if the square wave edge occurs prior to a pre-set time, wherein the pre-set time is based on the average time interval for previous edges. The method further includes the step of generating a correction edge when no edge is detected during the pre-set time interval. The method still further includes the step of detecting successive correction edges for determining an absolute position of the hydraulic stroke.
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Jin Young Il
Lee Jin Han
Dombroske George
Volvo Construction Equipment Korea Co., Ltd
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