PROCESS AND DEVICE FOR CONTROLLING A GEAR SHIFT OF AN AUTOMATIC GEAR BOX

摘要

The invention relates to a control process for an automatic gear box which permits gears to be shifted, in particular downshifted, with minimum interruption of tractive power. The phase in which the driving moment of the propulsion engine is reduced, the phase in which the frictional connection in the automatic gear box is interrupted, and the phase in which the rotational speed of the gear box input shaft is adapted to a suitable target rotational speed are designed in such a way that they overlap in time at least in part. In particular, when the frictional connection is interrupted in the automatic gear box, the propulsion engine transmits over the clutch a driving moment to the input shaft of the automatic gear box, causing a change in the rotational speed of the gear box input shaft (n_ge) which tends towards the synchronous rotational speed of the new gear. The invention also relates to a device for carrying out this process.