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New technology: tire sensors without batteries
Sumitomo Rubber Industries Ltd. (SRI), the parent company of Falken Tire, has developed a new technology that powers tire sensors while driving without a battery.
New technology: tire sensors without batteries
SRI has developed a technology that generates electrical energy from the rotation of the tire and transmits it to peripheral tire sensors. The in-tire power generation technology, developed in collaboration with Kansai University Osaka (Japan), is a breakthrough for SRI as the energy harvester inside the tire is now equipped with a power charging function. The static electricity generated as the tire rotates is now used to charge a power control circuit, which in turn activates and supplies power to an external sensor.
To this end, the structures and materials involved in generating frictional energy have also been optimized in order to significantly improve the power generated. Verification tests by SRI have shown that the system produces over 800 microwatts of power at tire speeds of 50 km/h. This amount of energy is sufficient to activate an external sensor - without the use of additional power sources - and to ensure continuous Bluetooth Low Energy transmission.
"The battery-free operation of tire sensors is a very important development for our overarching sensing core technology. It holds enormous potential for future applications such as use in autonomous vehicles. Until now, the limited battery life of sensor devices has been one of the biggest obstacles in the implementation of our tire sensor technology," explains Bernd Löwenhaupt, Managing Director Sumitomo Rubber Europe.