Patent ID: 6567736
Filing Date: 2003-05-20
Classification: B60W,F16D,F16H,Y10T

Abstract:
A method for the closed loop control of a rotational speed difference regulation of a switchable frictional engagement control in the drive train of a motor vehicle, comprising the steps of:a) determining an actual rotational speed difference of an input side and an output side of the frictional engagement control wherein the rotational speed of the output side is equalized and limited; b) determining a control pressure for the switchable frictional engagement control from absolute values of the desired rotational speed difference and the actual rotational speed difference between the input and output sides of the frictional engagement control; c) adjusting the determined control pressure by a torque reduction input to a governor for limiting torque in the frictional engagement control; d) adjusting the determined control pressure according to the input rotational speed of the frictional engagement control; e) determining a starting value for the control pressure of the frictional engagement control; f) damping and limiting a time shift around the closed loop to stabilize operation of the closed loop; and, g) adjusting the determined control pressure by a value determined by a rotational speed dependent frictional value determined for the frictional engagement control.