Patent ID: 7920951

Claim:
A control system for applying defined clamping forces in a brake that is electrically operable by an actuator ( 4 ) and includes a first friction surface (friction lining) and a second friction surface (brake disc), the control system comprising: a clamping force sensor to determine the clamping force (F meas ); a position sensor to determine the actuator position (φ meas ), wherein a correlation exists between the actuator position (φ meas ) and the clamping force (F meas ); a first controller ( 1 ) having an output quantity that corresponds to an actuator speed nominal value (n nominal ); a second controller ( 2 ) (speed controller) that is connected downstream of the first controller and to which signals representative of the actuator speed nominal value (n nominal ) and an actuator speed actual value (n actual ) are sent as input quantities, the output quantity of the second controller corresponding to an actuator torque nominal value (M nominal ); a third controller ( 3 ) (current controller) that is connected downstream of the second controller and to which signals representative of the actuator torque nominal value (M nominal ) and an actual value (I actual ) of the current to be supplied to the actuator are sent as input quantities, the output quantity of the third controller representing a correcting variable (U) for adjusting the actual value (I actual ) of the current to be supplied to the actuator; and a plurality of low-pass filters ( 9 , 10 ), wherein the nominal value (F nominal ) and the actual value (F meas ) of the clamping force are sent to the low-pass filters, and the output quantities (F nominalFilt ) and (F measFilt ) are sent to each one linearization module ( 11 , 12 ) in which the filtered clamping force values are transformed into a nominal value (φ nominal ) and an actual value (φ actual ) of the actuator position by a predefined characteristic curve, the first controller ( 1 ) being configured as a position controller which is furnished with the actuator position values (φ nominal , φ actual ) as input quantities.