PROCEDE DE FREINAGE A ACTIONNEMENT ELECTRIQUE D'UN VEHICULE AUTOMOBILE ET SYSTEME DE FREINAGE A ACTIONNEMENT ELECTRIQUE

摘要

Electrical, continuously acting wheel brake actuators are individually controlled. The following calculation and control procedures are carried out in a control unit: the wheel slip and the wheel acceleration are calculated for each wheel; if the wheel slip or the wheel acceleration exceed a predefined first threshold value, then the respective actual value of the brake pressure is stored; the quotient of the stored actual value and a pressure value which is characteristic of the vehicle is formed for the respective wheel, and the coefficient of friction mu is thus estimated; and an ABS brake-pressure closed-loop control operation is carried out at the individual wheels using the value.