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G. Lasser, J. Grosinger, R. Langwieser, C. Mecklenbräuker:
"Measurement Based Performance Evaluation of Advanced Tyre Monitoring Systems using RFID Technology";
Talk: International Microwave Symposium 2012, Montreal, Canada (invited); 06-17-2012 - 06-22-2012; in: "WFH: RFID-based Low-Cost Smart Sensor Networks for Challenging Environments", IEEE, (2012), ISBN: 978-1-4673-1086-4.

Currently, Tyre Pressure Monitoring Systems (TPMS) are in widespread commercial use for state-of-the-art vehicles and TPMS are (or will soon be) mandated by legislation in several countries. State-of-the-art TPMS technology is based on rather costly battery powered sensor units, often mounted at the wheel rim. Advanced tyre monitoring systems will evolve to sense not just the static tyre pressure, but also several dynamic tyre state variables, e.g., tyre contact area ("foot print"), slip angle, vibrations, age, and temperature, while simultaneously reducing the costs and environmental burden caused by their widespread commercial deployment. Advanced Tyre Monitoring Systems will be mounted within the tyre rather than at the wheel rim and avoid batteries through energy harvesting for sensor powering. Adding the sensor converts the tyre to an intelligent part of the vehicular sensor system and enables dynamic adaption of classical vehicular safety systems like anti-lock braking systems or electronic stability control. In this contribution we evaluate the use of RFID technology for tyre embedded sensors based on near-field radio channel measurements at 866 MHz and 2.45 GHz within a real-world vehicle. This radio channel is highly influenced by the proximity effects of the sensor unit's antennas mounted on lossy rubber layers and changes of antenna orientation due to tyre rotation. Our proposed solution includes dual antenna sensor units to combat the high channel losses with polarization diversity.

RFID, TPMS, ATMS

http://publik.tuwien.ac.at/files/PubDat_208886.pdf

Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"