Process to determine the absolute angular position of a motor vehicle steering wheel
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United States of America Patent
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Mar 18, 2008
Grant Date -
Jul 5, 2007
app pub date -
Jul 6, 2006
filing date -
Jul 14, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A method for determining absolute value of a rotational angle includes imaging a segment of a code track onto a sensor such that the sensor generates a corresponding output signal. The track includes a code in the form of a light and dark transition pattern over an angular range. The code contains code words with each code word corresponding to a respective angular value. The code word of the imaged segment is determined from the position of the transitions in the output signal to determine the angular value of the imaged segment. The position of the transitions in the output signal is compared with a reference curve to determine position deviations between the output signal and the reference signal. The reference curve represents the transitions expected in the output signal in the absence of unwanted mechanical influences. The unwanted mechanical influences are determined as a function of the determined deviations.
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