Tire Vertical Force Estimation Method using Suspension Deformation and Stochastic Road Model in Vehicle Suspension System

Tire vertical force is an important factor in the vehicle system because the tire vertical force directly affects the longitudinal force such as the driving force and the braking force, and the lateral force caused by steering motion. Therefore, estimating the tire vertical force is an essential issue. In this study, we propose a tire vertical force observer(TVFOB) using the measurable acceleration sensor and the suspension deformation sensor in a vehicle. The observer set a tire radius as a state, and the derivative of the tire radius is assumed as stochastic white Gaussian noise. A quarter car model is used to verify the performance of the algorithm The proposed algorithm is evaluated through the simulation by using Matlab Simulink and Carmaker.