METHOD FOR CONTROLLING THE SLIP OF A DIRECT DRIVE CLUTCH OF A TORQUE CONVERTER

摘要

The invention relates to a method for controlling the slip of a direct-drive clutch (9) of a torque converter (1) during a gear change in an automated transmission, that comprises sending, as a set point, values of cyclic opening ratio to an electro-valve (10) for adjusting the hydraulic pressure of the direct-drive clutch (9), wherein the initial value is determined from parameters resulting from a mapping. According to the invention, the value of the initial cyclic opening ratio sent as a set point is the value of the nominal initial cyclic opening ratio determined by a mapping, that is corrected by a predetermined correction coefficient memorised at the end of a previous similar gear change, from the comparison between the value of a slip (GR) representative of the slip values measured during the previous change and that of a theoretical reference slip corresponding to a nominal engine speed and turbine speed.