**5. Conclusions**

In this paper, a cost-effective wireless system for an intelligent tire prototype is presented. The proposed apparatus mainly consists in a sensing circuit equipped with a micro-controller unit, low-power wireless communication module, a low-cost flex sensor and a PVDF sensor to detect the strain rate. A tire model was analysed to predict the flex sensor output.

Subsequently, an experimental activity was conducted in order to analyze the feasibility of the proposed approach. In particular, the test rig was adopted to evaluate the possibility of estimating some tire working condition features from the flex sensor and the PVDF in free-rolling conditions and low speeds.

The research continued with a series of road tests, in which the intelligent tire prototype was tested in cornering, acceleration and breaking in real conditions. Strategies to reduce the sensing circuit energy consumption were investigated. Correlations between measurements and physical parameters were investigated as preliminary analysis. Further improvements of this estimation procedure will include an extensive experimental activity oriented to validate the proposed method with more experimental data.

**Author Contributions:** Conceptualization, S.S., M.T.; methodology, G.B., A.I., M.Ri.; software, M.Ri.; data curation, M.Ri., L.P., S.S.; writing—original draft preparation, L.P.; writing—review and editing, G.B., A.I., M.Ri., S.S., M.T.; supervision, M.Ru.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors would like to thank Giuseppe Iovino and Gennaro Stingo for their technical support.

**Conflicts of Interest:** The authors declare no conflict of interest.
