Adaptive absolute steering angle sensor
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United States of America Patent
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Oct 1, 2002
Issued Date -
N/A
app pub date -
Jun 19, 2000
filing date -
Dec 18, 1997
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Abstract
The invention relates to an adaptive absolute steering sensor for the absolute determination of a turning angle, especially for determining the steering angle in a motor vehicle by way of a code applied across a 360.degree. angular range for a determining the angle. The code and a sensor system are arranged in such a way that they are able to rotate in relation to each other. Absolute determination of the angle is carried out by reading the contrast information using a micro processor which determines both the angular position of the code and the fine resolution of the angles on the basis of the relative position of the recognized angle to the image on the photodetector system. At the same time the overall function of the system is verified and adjusted during each measurement. The code is determined using a photodetector system positioned in a single place, and used for determining the angle, whereby an unbroken segment of code track is shown on at least one photodetector line and at least one code word is detected to which corresponds a predetermined angle. The position of the code word in relation to the fixed position of the photodetector line is measured.
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