Investigating Alternative Phase Planes for Assessing Vehicle Stability

This paper discusses the possibility of assessing vehicle stability by means of unconventional graphical methodologies and defining a region of stability of the vehicle, using only yaw rate, lateral acceleration and sideslip rate. The three-dimensional \(\beta -r-\dot{\beta }\) phase surface is investigated, relating trajectories in the \(r-\dot{\beta }\) plane to their \(\beta \) values. The \(r-\dot{\beta }\) phase plane is investigated for different tyre models and tyre-road friction conditions. A new stability region is proposed.