Method for an enhanced absolute position sensor system

Details Method for an enhanced absolute position sensor system Method for an enhanced absolute position sensor system

2006-08-02

2008-09-02

Jeanglaude, Jean B. (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Having combined coding pattern

C400S472000

Reexamination Certificate

active

07420477

ABSTRACT:
An absolute position of a rotating axis is sensed at a desired resolution by employing two or more absolute encoders of a resolution that is lower than the desired resolution. A first absolute encoder that rotates in concert with the axis being sensed and a second absolute encoder that rotates a number of times for each rotation of the first encoder are employed. While the second absolute encoder data is utilized directly, the first absolute encoder data, through an interpretation of the context of the second absolute encoder data, is translated to a quantity equivalent to the rotational count of the second absolute encoder. Additionally, the data from the first and second absolute encoders can be manipulated so as to make a mechanical misalignment between the encoders or a temporal misalignment between their readings to be essentially inconsequential to the operation and accuracy of the enhanced absolute position sensor system.

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