Patent ID: 8000869
Filing Date: 2011-08-16
Classification: F16D,Y10T

Abstract:
1. A method for determining a torque characteristic of an automated friction clutch located in a drive train of a motor vehicle in power flow between a drive engine ( 3 ) and a drive transmission ( 4 ) and which is engaged in a resting position such that at least first and second marker points (M_K 1 (x_K 1 ), M_K 2 (x_K 2 )) of a regulating-path-dependent torque characteristic (M_K=f(x_K)) are determined, of which at least one marker point is determined at a slippage limit of the friction clutch ( 2 ), the first marker point (M_K 1 (x_K 1 )) is determined with the friction clutch ( 2 ) engaged, the transmission ( 4 ) in neutral and the drive engine ( 3 ) running, by disengaging the friction clutch ( 2 ) slowly until a reduction in speed of an input shaft ( 10 ) of the transmission ( 4 ) relative to a speed of the drive engine ( 3 ) is sensed, noting a corresponding pair of values (M_K 1 , x_K 1 ) of the first marker point with a known braking torque (M_B) of the input shaft ( 10 ) and a set position (x_K(M_B)) determined, storing the pair of values of the first marker point (M_K then using the pair of values of the first marker point (M_K