タイヤ側面ひずみを用いた路面摩擦係数測定に関する研究

抄録

Measurement of road surface friction coefficient is significant to improve advanced driver-assistance systems (ADAS). Generally, ADAS uses information obtained from wheel speed sensors, acceleration sensors, etc. However, it is difficult to measure accurately road surface friction coefficients with these sensors. Therefore, various studies that focuses on a tire that is only portion to contact with a road surface in a car have been conducted to develop an intelligent tire capable of measuring road surface friction coefficients. However, an intelligent tire capable of measuring road surface friction coefficients have not been put to practical use due to the difficulty of stable measurement of deformation of a tire and the difficulty in measuring road surface friction coefficients from the deformation of a tire. This study proposes a method to measure road surface friction coefficients from strains induced on the side of a tire, which is easily detected. We clarify the relationship between strains on the side face of the tire and loads acting on the tire at grounding surface using an experimental apparatus capable of simulating complete slip running with three axial loads applied to the tire and propose a simple method of measuring road surface friction coefficient from the measured strains.