A new type of clamping force estimator for electromechanical brake systems

In this paper, a new algorithm which considers the hysteresis by backlash to estimate clamping force from motor rotor position is proposed and its usefulness is shown with comparison of previous algorithm. In order to set the zero point of curve of clamping force versus motor rotor position using motor current, a new detection strategy for the contact point of the brake pads and the brake disc is developed. Additionally, Brake pad temperature adaptation method is also proposed to improve performance of clamping force estimation algorithm. EMB model is developed and validated using MATLAB/Simulink and the performance of the EMB controller based on estimation algorithm is shown by the simulation results.