Patent ID: 9523573
Filing Date: 2016-12-20
CPC Classification: B62D,G01C,G01D

Claim Text:
1. A rotation angle detection device comprising: a plurality of sensors used to detect a rotation angle of a rotary body; a sampling unit that samples an output signal from each of the sensors at prescribed timings; and a computation unit that computes the rotation angle of the rotary body with use of a plurality of the output signals from at least two sensors among the plurality of the sensors, the output signals being sampled at a prescribed number of different timings, the prescribed number being two or more, wherein where X is a number of multiple expressions obtained by mathematizing each of the plurality of the output signals used by the computation unit to compute the rotation angle of the rotary body and Y is a number of unknown quantities included in the multiple expressions, a condition that Y is greater than X is satisfied, the computation unit is configured to compute the rotation angle of the rotary body by solving simultaneous equations constituted of the multiple expressions after setting Y equal to or smaller than X, where among the unknown quantities included in the multiple expressions, the amplitudes of a plurality of output signals from each one of the plurality of sensors, the plurality of output signals being sampled at different sampling timings, are equal to each other, and each of the expressions including an amplitude and the rotation angle of the rotary body as the unknown quantities.