A method for calibrating a controllable friction clutch in the drive train of a all-wheel vehicle off the

摘要

A method for calibrating a by way of an actuator controlled friction clutch in the drive train of a all-wheel vehicle off, which drive train of a motor (1), a manual transmission (2), a transfer gearbox (3) with the friction clutch (21), a first sub-branch (15) and a via the friction clutch (21) driven second sub-branch (22), wherein the first sub-branch (15) from the output of the gearbox (2) to a first driven shaft (4), wherein the second sub-branch (22) from the output of the friction clutch (21) to a second driven axle (5), and wherein a control unit (10) of operating variables of the vehicle, a desired torque capacity (m_ksoll) the friction clutch (21), and, moreover, the for the adjustment of the actuator (24) to be supplied to the manipulated variable is determined, consisting in the following steps:a) the torsional stiffness (c1; c2) of one of the two partial windings (15, 4; 22, 5) is determined,b) during operation with to a certain torque capacity (mksoll) is set friction clutch (21) from the rotation angle (φ₁₄; φ₃₀) at the beginning of this respective part strand (15, 4; 22, 5), i.e. at the output of the gearbox (2) or at the output of the friction clutch (21), and of the angles of rotation (φ₈, φ₉; φ₆, φ₇) on the wheels of this respective part strand (15, 4; 22, 5) and from the torsional rigidity by the clutch (21) is actually transmitted torque (m_kist) calculated,c) the actually transmitted by the clutch torque (m_kist) with the adjusted torque capacity (m_ksoll) are compared and the the assignment between the set torque capacity (m_ksoll) and the manipulated variable characteristic field, which is corrected accordingly.