The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 2008
Filed:
Sep. 15, 2006
Li-te Kuo, Hsinchu County, TW;
Hsing-cheng Yu, Hsinchu County, TW;
Tzung-yuan Lee, Taichung County, TW;
Shyh-jier Wang, Hsinchu County, TW;
Li-Te Kuo, Hsinchu County, TW;
Hsing-Cheng Yu, Hsinchu County, TW;
Tzung-Yuan Lee, Taichung County, TW;
Shyh-Jier Wang, Hsinchu County, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A method and an apparatus for estimating the position of a moving part of a linear actuator are provided. The method comprises the following steps. Move the moving part towards a target position. Receive magnetic signals generated by the magneto-resistive sensor of the linear actuator, which include a sine signal and a cosine signal. Then, generate a first square wave, a second square wave, and a regional square wave based on the sine signal and the cosine signal. Generate a saw-tooth wave based on the sine signal, the cosine signal, the second square wave, and the regional square wave. Next, calculate the number of regions which the moving part is across from the origin point based on the first square wave, the second square wave, and the regional square wave. Finally, estimate the current position of the moving part based on the saw-tooth wave and the number of regions.