Method for calibrating an analog sensor
US7194377B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2005 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Sep 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the absolute angle of an angle position sensor over a predetermined rotation range and in which the sensor generates a repeating periodic analog signal across the rotation range. The initial position of the sensor is stored in memory when the sensor is in a predetermined initial angular position. Thereafter, the angular position of the sensor within the rotation range is determined as a function of both the sensor output signal and the stored angular position of the sensor. The current position of the sensor is iteratively stored in memory. Additionally, the sensor output is calibrated by dividing the sensor output into a plurality of arc segments across the rotation range. A polynomial curve fit is then applied to each arc segment to determine the calibration for the sensor and this calibration data is subsequently utilized to provide a signal representative of the absolute angle of the position sensor over the rotation range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.