Patent ID: 6932438

Claim:
Method for establishing the relationship between actuator position and actuator clamping force for a brake which is operated by an electromechanical actuator wherein the actuator includes an electric motor and an arrangement operatively engaged to the electric motor to convert a rotational movement of the electric motor into a translation, wherein a torque created by the actuator is determined by measuring an electrical current fed into the electric motor and an actuator position is measured and wherein a sinusoidal oscillation of small amplitude being superimposed on the actuator movement, comprising the steps of: a) defining a range by the measured values of the actuator position and dividing the range into n partial ranges, b) assigning each one of said n partial ranges two software-based low-pass filters of m th degree, c) calculating an actuator clamping force corresponding to the actuator efficiency degree η=1, wherein said actuator clamping force is calculated from the measured values for the actuator position and the actuator torque where a transmission ratio of the arrangement is used for conversion of a rotational movement into a translation measurement and an overall moment of inertia d) feeding the values of the actuator position and the actuator clamping force F η=1 corresponding to the actuator efficiency degree η=1 to those filters that belong to a partial range where the actuator position value is situated, wherein mean values of the actuator position (φ η=1, mean (i)) and the actuator clamping force (F η=1, mean (i)) corresponding to the actuator efficiency degree η=1 are formed by the filters, and e) identifying the relationship between the actuator position and the actuator clamping force from the mean values of all of said n partial ranges.