Effect of inflation pressure on tyre forces under combined-slip conditions based on the UniTire model
by Xiaoyu Li; Nan Xu; Konghui Guo; Chao Yang; Yanjun Huang
International Journal of Vehicle Design (IJVD), Vol. 91, No. 4, 2023

Abstract: The UniTire model is a nonlinear semi-empirical tyre model for the dynamic simulation and control of a vehicle under complex wheel motion inputs involving pure longitudinal/lateral slip and combined slip. Based on the model, this study reveals how the inflation pressure affects the tyre forces under combined-slip conditions and then integrates such effects into the UniTire model to extend its applicability. First, by introducing a direction factor for the resultant shear force, the UniTire model for combined-slip conditions is developed to represent the tyre forces. Second, this paper comprehensively studies the effect of the pressure on the direction factor and tyre normalised properties to uncover the intrinsic correlation between the pressure and tyre forces. The experimental data are used during the entire analysis, and the results show that the anisotropy of tyre stiffness is a key factor for determining the resultant force direction under combined-slip conditions. More importantly, the UniTire model can be extended or complemented by incorporating the effect of the inflation pressure such that the model can be effectively applied in broader working conditions.

Online publication date: Thu, 01-Jun-2023

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