Energy-autonomous UHF RFID sensor for tire pressure monitoring system

Abstract

Thanks to the miniaturization of components and therefore the significant reduction of energy needs, the design of passive smart-tag incorporating intelligent sensors is now possible. The goal of this study is to develop a tire pressure sensor for an electric bike with battery-free. Therefore, there is no need to replace periodically the battery, so as cuts off maintenance costs and extend the life time of the smart-tags. An UHF RFID reader installed on the bicycle frame and connected to the battery e-bike transmits the RF power at 868 MHz toward each tag integrated in the wheel rims.Firstly, this article presents the whole hardware architecture of a passive smart-tag which had to respond of technics constraints and the complexity to integrate 2 antennas in a small package box. Secondly, the methods to ensure an ultra-low consumption are developed. Finally, practical tests are compared with simulations, and, validations are carried out showing the compliance and the industrialization of this innovative system.

Keywords

• Pressure monitoring system
• Radio frequency identification
• Power harvester
• Passive smart-tag
• Electric bike
• Rectenna