부산대학교 도서관

The development of intelligent tires that employ sensors to monitor road surface information and tire conditions has been underway for realizing safe and secure mobility for society. This paper describes a wear estimation method for tires using piezoelectric films arranged in parallel. We compared the outputs of multiple piezoelectric films between the new and worn tires. The ratio of the peak interval time to one tire rotation period(time ratio) and the ratio of positive voltage to negative voltage (voltage ratio) were analyzed. The position where the voltage ratio is large shifts in the direction of the tire side due to wear. There is no difference in the time ratio in the central part of the tire before and after wear, but it decreases in the lateral part of the tire. These are due to the fact that the contact patch width widens due to wear, and the sidewall section begins to support the load.