Analysis of the influence of tyre pressure changes on vehicle operating parameters

The paper aimed to identify the effect of changes in tyre pressure values and the influence of wheel size on the shock absorber damping coefficient (EUSAMA coefficient) using 20 passenger cars with SUV bodies. Eleven variants of tyre pressure were used. The component's behaviour was followed through the Digital Image Correlating system PONTOS 5M and measurement markers cemented on a rim, tyre and body. Thanks to this, it was possible to identify the effect of tyre pressure on tyre deformation in a 3D coordinate system and on the vehicle's operating parameters. It was possible to conclude that there is a significant relationship between the values of the shock absorber damping coefficient and the tyre pressure. Moreover, these changes were also dependent on the tyre size. The Eusama coefficient values ranged from 90% to 60%. At each used pressure value, there were clear differences between the components’ behaviour at the region located in the lower and upper part of the tire, as well as between the position of the front and rear part of the component covering the wheel rotation axis.