Robust sideslip angle observer with regional stability constraint for an uncertain singular intelligent vehicle system

The sideslip angle is an important state parameter for vehicle stability control; in this study, a robust sideslip angle observer with regional stability constraint is presented. In order to achieve more accurate sideslip angle estimation, the vehicle heading angle and yaw angle are distinguished and the relational expression between vehicle heading angle, yaw angle and sideslip angle was applied to the singular vehicle modelling process. Considering the time-varying tire cornering stiffness, the uncertain singular vehicle model is established by integrating the singular vehicle dynamic equation and model uncertainty. Then, a robust sideslip angle observer whose pole assignment has the regional stability constraint is designed. Simulation studies and experimental results illustrate the effectiveness of the proposed sideslip angle estimation method.