Modelling and Simulation of Electronic Brake Booster with Fuzzy Logic Control

On one hand, simulation tools are widely used to study and examine new technologies before building prototypes. It is a cost and time saver if it is mathematically modeled with and simulated in real time with sufficient fidelity. On the other hand, the expansion of electric and hybrid vehicle development requested advancing the Electronic Brake Booster (EBB) technologies. In this paper, a simulation tool for the EBB is developed to simulate the performance in real time with a very quick response compared to the previous models with a novel fuzzy logic control (FLC) for the position tracking control. The configuration of the EBB is established, and the system model, including the permanent magnet synchronous motor (PMSM), a double reduction transmission (gears and a ball screw), a servo body, a reaction disc, and the hydraulic load, is modeled. The load-dependent friction has been compensated by using the Karnopp-friction model. FLC has been used for the control algorithm. The control concept focused on transforming the pressure control of the EBB into position tracking control to overcome the nonlinearity and achieve the control process with the required precision and dynamics. The EBB simulation model has been developed using MATLAB/Simulink, and an ode4 Runge-Kutta solver with a step size of 10 milliseconds is used to solve the differential equations of the model. In order to present the reliability of the developed simulation model, a comparison was made with a widely referenced and validated EBB model that was developed to simulate the performance. The simulation results showed a very good correlation between the developed model and the widely referenced model. In addition to that, the developed model is able to simulate the performance of the EBB faster than the widely referenced model and has real-time behavior.