Car tank level measurement procedure, has capacitive sensor controlling extraction pump with dynamic related parameter threshold setting

摘要

A car tank (3, 4) level measurement procedure has a capacitive sensor (1, 2) with reference and multiple electrode measurement capacitors whose output signal is processed (6) to give a level indication (5) and to switch (7, 8) off an extraction pump (12) when the liquid (11) level falls below a set threshold. Independent claims are also included for: (1) Adjusting the threshold level depending on values of motion and orientation derived correction factors, to inhibit limit operation in certain conditions; (2) A sensor system using the procedure.