Abstract: The invention relates to a capacitive sensor (2) for detecting the level (52) of a liquid (54) in a tank (48). The inventive sensor consists of: a flat longitudinal support (4) comprising proximal (8), central (10) and distal (12) parts and connection means (6) which are located in the proximal part (8) and which are used to connect the support (4) and the exterior of the support (4) electrically; a measuring pair (14) comprising interdigital arms which are disposed on the support (4) at least in the central part (10) thereof; and a reference pair (16) comprising interdigital arms which are disposed on the support (4) in the distal part (12) thereof. The aforementioned support (4) comprises at least three layers, and the reference pair (16) is linked to at least one connection track (26) which is located in an inner layer (24) of the support (4) and which is linked to the above-mentioned connection means (6). The invention also relates to a tank (48) comprising one such sensor (2).

Abstract: A sensor for detecting a liquid level, including a measurement capacitor, a reference capacitor, an integrating capacitor, a calibration capacitor, a controller, an amplifier, a comparator, and a complementary calibration capacitor. The controller implements operations, over accumulation periods and for given target and discharge capacitors, of a target capacitor charging, a charge transfer, a decision, a conditional discharge, and a return. The target and discharge capacitors given at each period are taken from pairs of capacitors, including the measurement and calibration capacitors and the reference and complementary calibration capacitors. A method estimates the liquid level using the sensor in a vehicle.

Abstract: A sensor for detecting a liquid level, including a measurement capacitor, a reference capacitor, an integrating capacitor, a calibration capacitor, a controller, an amplifier, a comparator, and a complementary calibration capacitor. The controller implements operations, over accumulation periods and for given target and discharge capacitors, of a target capacitor charging, a charge transfer, a decision, a conditional discharge, and a return. The target and discharge capacitors given at each period are taken from pairs of capacitors, including the measurement and calibration capacitors and the reference and complementary calibration capacitors. A method estimates the liquid level using the sensor in a vehicle.