A Dynamic Decoupling Control Method for PMSM of Brake-by-Wire System Based on Parameters Estimation

Abstract

Brake-by-wire (BBW) system is a basic and significant component for intelligent vehicles and electric vehicles. During autonomous emergency braking process, the dynamic response requirement of the BBW actuator motor is very high. Hence, a dynamic decoupling control method is proposed for permanent magnet synchronous motor (PMSM) of BBW system to improve the dynamic response performance. First, a PMSM dynamic model and a thermodynamic model of stator winding are built. Then, the inductance and flux linkage parameters are identified based on recursive least squares and the back electromotive force formula, and an accurate relationship between inductance and flux linkage parameters and motor temperature is obtained. Finally, a dynamic decoupling control method based on the intensive binary dichotomy table method is designed. The results both of simulations and experiments show that the proposed method shorten the boost time by 18.30%, thereby reducing the braking time by 9.63%.