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1. (WO2018100198) METHODS AND SYSTEMS FOR CALIBRATING AN ORAL CLEANING DEVICE
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What is claimed is:

1. A method (400) for calibrating a gyroscope (28) of an oral care device (10), the method comprising the steps of:

scheduling (420) a data acquisition scheme comprising a plurality of time points;

obtaining (430) sensor data by the gyroscope at each of the plurality of time points;

determining (440) whether the oral care device was experiencing motion at any of the plurality of time points and, if so, discarding those time points from further analysis;

determining (450) a calibration model using the obtained sensor data;

generating (460), based on the obtained sensor data and the determined calibration model, one or more parameters describing a behavior of the gyroscope; and

calibrating (470), using the one or more parameters, gyroscope data obtained during a cleaning session.

2. The method of claim 1, wherein the calibration model comprises a calibration offset.

3. The method of claim 1, wherein the data acquisition scheme is based at least in part on observed temperature data.

4. The method of claim 1, wherein the data acquisition scheme is based at least in part on one or more expected temperatures.

5. The method of claim 1, wherein the data acquisition scheme is designed maximize a range of temperatures for the plurality of time points, and minimize a chance of physical motion at the plurality of time points.

6. The method of claim 1, further comprising the step of testing (480) the determined calibration model at a known temperature.

7. The method of claim 6, further comprising the step of requesting (490), if the determined calibration model is inaccurate, a calibration by a user of the oral care device.

8. An oral care device (10) configured to calibrate a sensor (28), the device comprising:

a gyroscope (28) configured to obtain gyroscope data; and

a controller (30) configured to: (i) schedule a data acquisition scheme comprising a plurality of time points; (ii) receive sensor data from the gyroscope for each of the plurality of time points; (iii) determine whether the oral care device was experiencing motion at any of the plurality of time points and, if so, discarding those time points from further analysis; (iv) determine a calibration model using the obtained sensor data; (v) generate, based on the obtained sensor data and the determined calibration model, one or more parameters describing a behavior of the gyroscope; and (vi) calibrate, using the one or more parameters, gyroscope data obtained during a cleaning session.

9. The oral care device of claim 8, wherein the calibration model comprises a calibration offset.

10. The oral care device of claim 8, wherein the data acquisition scheme is based at least in part on observed temperature data.

11. The oral care device of claim 8, wherein the controller is further configured to test the determined calibration model at a known temperature.

12. The oral care device of claim 11, wherein the controller is further configured to request, if the determined calibration model is inaccurate, a calibration by a user of the oral care device.

13. A cleaning device (10) configured to calibrate a gyroscope (28), the device comprising:

a scheduling module (320) configured to schedule a data acquisition scheme comprising a plurality of time points;

an acquisition module (330) configured to obtain sensor data from the gyroscope for each of the plurality of time points, and further configured to determine whether the oral care device was experiencing motion at any of the plurality of time points and, if so, to discard those time points from further analysis;

a model selection module (350) configured to determine a calibration model using the obtained sensor data;

a model calibration module (360) configured to generate, based on the obtained sensor data and the determined calibration model, one or more parameters describing a behavior of the gyroscope; and

a model compensation module (370) configured to calibrate, using the one or more parameters, gyroscope data obtained during a cleaning session.

14. The cleaning device of claim 13, further comprising a model validation module (380) configured to test the determined calibration model at a known temperature.

15. The cleaning device of claim 13, further comprising a connected temperature module (390) configured to provide temperature data to the scheduling module or the model compensation module.