Anti lock system for a vehicle electromechanical brake system based on a fuzzy controller

摘要

The unit has a fuzzy controller (5) which forms a pressure change rate according to the wheel slip, wheel acceleration, locking pressure and a relationship of the current pressure to the locking pressure. The rate is fed via an integrator (6) to an actuator of an electro mechanical braking system. The locking pressure is dynamically adjusted according to the wheel slip. The wheel speeds are used to calculate the vehicle speed and used to calculate a slip rate which is fed to a fuzzy controller and a locking pressure computation unit (3) to calculate a locking pressure (PL). A differentiating element (2) determines from the wheel speed, the wheel acceleration (AW) which is also fed to the fuzzy controller. The locking pressure computation unit and divider (4) receive the current pressure signal (PA) from the brake actuator/actuator controller (7) which receives the nominal pressure (PN) as input. Depending on the wheel slip value, the signal for the locking pressure (PL) is updated so the current pressure signal is always stored as the locking pressure, if the pressure slip is above a threshold value.