Patent ID: 7813858

Claim:
A method for controlling the slip of a vehicle clutch, wherein in the method the difference between a speed signal of the drive-end input shaft of the clutch and a filtered speed signal of a transmission-end clutch output shaft are maintained at a desired value, by carrying out the following steps: (a) calculating a sliding average value n_ma from a raw signal n_raw corresponding to an instantaneous speed of the transmission-end output shaft of the clutch, of which an averaging range of N interrupts is adapted to a chatter frequency 1/T for a respective gear; (b) calculating a derivative of a sliding average value n_dot from the sliding average value n_ma, calculated in a current interrupt, and from a sliding average value n_ma_old, calculated from a previous interrupt; (c) calculating a smoothed derivative of a speed signal n_dot_filt with a PT1-filter from the derivative of the sliding average value n_dot calculated in step (b) and from a smoothed derivative of a speed signal n_dot_filt_old calculated in the previous interrupt; (d) calculating a predicted speed signal n_pred for the current interrupt from a filtered speed signal n_filt_old calculated in the previous interrupt and from the smoothed derivative of the speed signal n_dot_filt; (e) calculating a weighted average value n_PT1 from the raw signal n_raw and the filtered speed signal n_filt_old calculated in the previous interrupt; and (f) calculating a filtered speed signal n_filt from a weighted average value n_PT1 and from the predicted speed signal n_pred.