Development of Detachable Triboelectric Nanogenerator for Tires

Intelligent tires are key elements in autonomous vehicles and the Internet of Vehicles. The use of a tire pressure monitoring system (TPMS) is a promising approach to self-sustaining tire sensors for energy harvesting. In this study, triboelectric nanogenerators (TENGs) designed for intelligent tires were placed in a tire as power sources to operate a TPMS, and their power generation characteristics were investigated. It was possible to obtain an output of approximately 400 to 600 $\mu \mathrm{W}$ at the speed of $60 \mathrm{~km} / \mathrm{h}$ over a driving distance of 2000 km in an actual passenger car. Furthermore, the TPMS was always started approximately 300 m after the car started running, and the air pressure and temperature inside the tires could be constantly monitored during driving.