Liquid height level device

A device for measuring a height of a liquid level of liquid inside a tire, said device comprising:

• a stem of a tire pressure valve that comprises a base, a first electrode, a second electrode, and an electrically isolated part between the first electrode and the second electrode,
• a power source, and
• an electric circuit;
• wherein the stem of the tire pressure valve is designed to be fixed to a rim of the tire in such a way that an upper part of the first electrode and an upper part of the second electrode are deigned to be protrude outside the rim and a lower part of the first electrode and a lower part of the second electrode are deigned to be protrude inside the rim;
• wherein the lower part of the first electrode or a first extension that is connected to the lower part of the first electrode is designed to be positioned inside the tire in such a way that the lower part of the first electrode or the first extension of the first electrode is capable to be immersed inside liquid inside the tire when the tire pressure valve faces the ground;
• wherein the lower part of the second electrode or a second extension that is connected to the lower part of the second electrode is designed to be positioned inside the tire in such a way that the lower part of the second electrode or the second extension of the second electrode is capable to be immersed inside the liquid inside the tire when the tire pressure valve faces the ground;
• wherein said upper parts of said electrodes are designed to be electrically connected to the power source, and to the electric circuit that is designed to measure an electric property of liquid between the lower parts of said electrodes or between their extensions, wherein an intensity of said electric property depends on a height of a liquid level of the liquid inside the tire;
• wherein the electric circuit is designed to output an electric value as an output signal for the measured electric property;
• and
• wherein said output signal represents the height of the liquid level inside the tire and is capable to be used to calculate the height of the liquid level inside the tire.

An in-tire system for measuring a height of a liquid level of liquid inside a tire mounted on a rim, comprising:

• a first electrode,
• a second electrode,
• a kinetic energy harvester that is designed to harvest energy from vibrations of the tire,
• a power management circuit that is designed to converts electrical power of the kinetic energy harvester to a DC power,
• a rechargeable battery that is designed to be charged by the kinetic energy harvester through a charging circuit,
• an electric circuit,
• a pressure sensor is designed to measure tire pressure,
• a processor that is designed to manage measurements of the height of the liquid level of the liquid inside the tire and tire pressure levels,
• a transmission module that is designed to transmit data of said measurements to a receiver that is positioned outside the tire;
• wherein rechargeable battery is designed to power the electric circuit, the pressure sensor, the processor, and the transmission module;
• wherein the electrodes are designed to be positioned inside the tire in such a way that their lower parts are capable to be immersed inside the liquid inside the tire when the electrodes face the ground;
• wherein the electric circuit is designed to be connected to said electrodes for measuring an electric property of the liquid between the electrodes and wherein the intensity of said measured electric property depends on the height of the liquid level of the liquid inside the tire;
• and
• wherein the electric circuit is designed to output an electric value as an output signal for said measured electric property, and wherein said output signal represents the height of the liquid level inside the tire and is capable to be used by the processor to calculate the height of the liquid level inside the tire.