Rotation angle detection device having increased accuracy
US11255703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2018 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | Jan 11, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24485
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle detection device for accurately detecting a rotation angle is obtained even when electromagnetic noise due to an electrical component(s) and the like of an electric automotive vehicle is superimposed on detection signals of the rotation angle detection device. The device includes a multi-phase/two-phase transformation unit for converting a plurality of detection signals, each being outputted from rotation detectors in accordance with a rotation angle of a rotating body so as to output transformed signals as two-phase signals; an addition-subtraction calculation unit for generating addition-subtraction signals by mutually performing addition to the two-phase signals and subtraction therefrom; an amplitude correction unit for modifying amplitudes of the addition-subtraction signals in accordance with an amplitude correction value, and for outputting post-correction addition-subtraction signals; and an angle calculation unit for calculating an angle based on the post-correction addition-subtraction signals, and for outputting an angular signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.