Method for searching a capacitance variation of a capacitive sensor of a motor vehicle
US9279875B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 21, 2014 |
| Grant date | Mar 8, 2016 |
| Priority date | — |
| Expiry date | Sep 8, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method of searching for a variation in capacitance of a capacitive sensor, includes a phase of searching for variation in capacitance and, when a capacitance variation has been detected, a phase of verifying the variation in capacitance. The search phase includes a recurrent step of searching for variation in capacitance including steps of measuring the duration of a first measurement sequence and determining, according to the measured duration, whether a first predefined detection criterion for variation in capacitance is verified. The verification phase includes steps of measuring the duration of a second measurement sequence and determining, according to the measured duration, whether a second predefined detection criterion for variation in capacitance is verified. The first measurement sequence has a reference duration less than that of the second measurement sequence, and the verification phase includes, when the second detection criterion is not verified, a step of updating the first detection criterion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.