Dual sliding mode observer and Kalman filter-based nonlinear control of a BLDC actuated in-wheel anti-lock braking system
摘要
A sliding mode controller is proposed to regulate the longitudinal slip of each wheel through electric motorization, with the aim of maximizing traction within an ABS system. The control of longitudinal slip is carried out in two stages: initially, the controller adjusts the angular velocity using the braking torque applied to each wheel, and subsequently, this torque is refined through duty cycle modulation when using BLDC motors with an inverter. The tire friction forces are modeled using the nonlinear Magic Formula, and the stability analysis of the sliding mode controller is conducted based on Lyapunov criteria. Additionally, a sliding mode observer is employed to estimate the longitudinal velocity, while a continuous Kalman filter is integrated to eliminate noise in angular velocity measurements and estimate the electromagnetic torque of the electric motor. The controller’s precision is evaluated through numerical simulation.