System of controlling or regulating an electromechanical brake

System of controlling or regulating a brake, including a first friction surface which is electrically operable by means of an actuator and a second friction surface, a clearance being provided between the friction surfaces, means which sense directly or indirectly the position of the actuator as well as current being supplied to the actuator, the system comprising:

• a device which detects when the first friction surface moves into contact with the second friction surface and subsequently generates a contact signal (K*), a controller which is switchable between a first and a second control mode, and to which are sent, as input quantities, signals representative of a nominal value (VSoll) and an actual value (VIst) of a force or a torque desired in the actuation of the brake, a signal representative of a nominal actuator position (φSoll), a first switching variable (S1) as well as the contact signal (K*) representative of the contact making of the first friction surface on the second friction surface, and the controller generating a first correcting variable (CMD1),
• a clearance guiding and monitoring module to which are sent, as input quantities, a control variable (ST) for activating detection at the clearance, signals which correspond to the current (IAkt) being supplied to the actuator and to an actuator position (φAkt) supplied from a position signal conditioning circuit, and which supplies the signal representative of the nominal actuator position (φSoll), the first switching variable (S1), a second switching variable (S2), as well as the contact signal (K*), and generates a second correcting variable (CMD2),
• wherein the first correcting variable (CMD1) and the second correcting variable (CMD2) are coupled to a selection circuit which, as a function of the second switching variable (S2), sends one of the two correcting variables (CMD1, CMD2) to a servo booster whose output signal (IAkt) is used to drive the actuator.