Liquid level sensor and liquid level estimation method

Details Liquid level sensor and liquid level estimation method Liquid level sensor and liquid level estimation method

2005-12-20

2010-12-07

Rogers, David A. (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

C073S29000R, C073S30400R, C073S313000, C324S658000, C324S663000, C324S686000

Reexamination Certificate

active

07845224

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.

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