Patent ID: 6694798
Filing Date: 2004-02-24
Classification: F16H,G01M

Abstract:
A process for determining a coefficient of friction (&mgr;) of a hydraulically activated coupling (4, 5, 6 or 7, 8, 9) in a load-shifting transmission (1), comprising:driving a drive shaft (14) of the transmission (1) at a specified torque (T); blocking an output shaft (15) of the transmission (1) with a closed coupling (4, 5, and 6 or 7, 8, and 9) during the calibration run; reducing the activation pressure (p) of coupling (4, 5, 6 or 7, 8, 9) in accordance with a specified course over time; recording the differential rotational speed (&Dgr;n) between the input (17, 18, 19) and the output (20) of the coupling (4, 5, 6 or 7, 8, 9); ascertaining the activation pressure (p) at which the differential rotation speed (&Dgr;n) is greater than zero; and computing a separation coefficient of friction (&mgr;separation) on the basis of torque (T), activation pressure (p) and a construction-conditioned clutch constant.