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:
Mar. 18, 2008
Filed:
May. 12, 2005
David Watt, Newark, CA (US);
Mehmet Alpay, Portland, OR (US);
Mark Unrath, Portland, OR (US);
John Wen, Melrose, NY (US);
Ben Potsaid, Troy, NY (US);
David Watt, Newark, CA (US);
Mehmet Alpay, Portland, OR (US);
Mark Unrath, Portland, OR (US);
John Wen, Melrose, NY (US);
Ben Potsaid, Troy, NY (US);
Electro Scientific Industries, Inc., Portland, OR (US);
Abstract
Preferred embodiments of the invention implement techniques for modifying the command trajectory, the architecture of a servomechanism control system, or both, to reduce the servo error during and/or after the command trajectory. An iterative refinement procedure generates for use by the servomechanism control system a corrective input, du, which significantly reduces the error between the desired and actual servomechanism control system outputs. In one embodiment, a uniquely identified plant model is employed in the iterative refinement procedure to compute an approximate gradient that improves the performance and reliability of the refinement procedure. In another embodiment, the actual plant response is used in place of the identified model in the iterative refinement procedure. This is accomplished by time-reversing the stored error signal from a training run, before applying it to the plant to generate an update to the corrective input signal du.