Tire Dynamics Deflection Assessment from IMU Measurement

Abstract

One important objective of vehicle suspension design is Safety, considering road holding performance in terms of its cornering, braking and traction. In this sense, we are interested in studying the tire deflection since it relates to how good the road holding is via the variation of normal tire load. We apply the full car suspension model with some measured or estimated parameters as reference model. Vehicle body's accelerations and angular rates are measured. The sprung mass displacement, body roll and pitch angle can be calculated and compared to the measurement values. The errors and error gradients are derived and then adjusted via gain update estimation consulting the fuzzy logic rules in order to corrected parameter. Finally suspension deflection and tire deflection are predicted via our algorithm. The results are in accordance with the physical meaning and subjective assessment by experienced driver.