Rotation angle detection device and electric power steering system including the same
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United States of America Patent
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Dec 20, 2016
Grant Date -
Jun 12, 2014
app pub date -
Dec 12, 2013
filing date -
Dec 12, 2012
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Abstract
Sinusoidal signals (S1, S2) having a phase difference of 120° are output from two magnetic sensors in accordance with rotation of an input shaft. A first rotation angle computation unit computes a rotation angle θ(n) on the basis of output signals S1(n), S1(n−1), S2(n), S2(n−1) from the magnetic sensors, which are sampled at two sampling timings. At this time, the first rotation angle computation unit computes the rotation angle θ(n) on the assumption that there are no variations of amplitudes of the output signals (S1, S2) from each one of the two sensors due to temperature changes between the two sampling timings.
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