Method for controlling torque change in automatic gear box in vehicle, involves controlling clutches according to control laws respectively, where primary final torque is different from primary initial torque

摘要

The method involves controlling a clutch according to a torque control law (C1) having a constant transmission portion transmitting zero torque between an advanced instant and a final instant (t-f). Another clutch is controlled according to another torque control law (C2) having an increasing portion (102) increased during transmission of the zero torque at a delayed instant (t-d) upto transmission of primary final torque (C-ef) at the final instant, where the primary final torque is different from a primary initial torque (C-ei).