Patent ID: 8136891

Claim:
A method for applying defined clamping forces in a brake that is electrically operable by an actuator and includes a first friction surface (friction lining) and a second friction surface (brake disc), in between which a clearance is allowed, the method comprising: determining an application of the first friction surface on the second friction surface; determining actual values (F meas ) of a clamping force by a clamping force sensor that is communicated to a control system; determining an actual value (φ meas ) by a position sensor that is communicated to the control system, wherein a correlation exists between the actuator position (φ meas ) and the clamping force (F meas ), with a value ((φ 0 ) of the actuator position being determined which corresponds to the application of the first friction surface on the second friction surface with the control system, continuously low-pass filtering the actual values of the actuator position (φ meas ) and of the clamping force (F meas ) within the control system; determining time derivatives (φ meas,filtp , F meas,filtp ) of the filtered values of the actuator position (φ meas,filt ) and the clamping force (F meas,filt ); producing a quotient Q=F meas,filtp /φ meas,filtp ; calculating an assessed value (φ 0,assess ) of the actuator position according to the formula φ 0,assess =φ meas,filt −F meas,filt /Q; subjecting the calculated assessed value (φ 0,assess ) to a plausibility check with a plausibilsation module of the control system; filtering the plausibilised assessed value (φ 0,plan ) in a low-pass filter of nth order within the control system to obtain, the output quantity of the value (φ 0 ) of the actuator position that indicates the application of the first friction surface on the second friction surface; and controlling the actuator to apply a defined claiming force in the brake based on the determined value (φ 0 ) with the control system.