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This study aims to experimentally investigate accordance between tire pressure and vertical deflection of tire in order to use in TPMS (Tire Pressure Monitoring System). For this aim, the resonance frequency of vertical deflection of tire is determined by using test results. For this, the road tests have been conducted on flat and dry road for measuring the tire deflection. These tests are run at constant vehicle speeds 30 and 100km/h for tire pressures 15, 20, 25, 30, 35psi. Therefore, the vertical deflection changes have been measured under same road conditions with different vehicle speeds. The frequency responses of the measured vertical deflections are obtained by using (SRMS) root mean square of sampled vertical deflection signals. The resonance frequency of the vertical deflection is taken from the frequency responses. The results show that the accordance between tire pressure and vertical deflection of tire can be achieved irrespective of the changes in vehicle speed. Consequently, the algorithm to detect the drops in tire pressure based on tire deflection is developed by using the time and frequency domain results.

Experimental Study on Development of Smart Algorithm Based on Tire Deflection to Detect the Drops in Tire Pressure