METHOD FOR ADAPTATION OF PRESSURE OF AN OVERLAPPING UPSHIFTING

摘要

A method for pressure adaptation is proposed for an automatic transmission. The gear shifts here are carried out as overlapping gear shifts with a first opening (K1) and a second closing (K2) clutch, the overlapping gear shift consisting of a first and a second phase. During the first phase, a banking of the transmission input rotational speed (nT) is adjusted. The invention proposes that upon issuance of the shift command, a time period (t2) is determined until the transmission input rotational speed has reached the banking value (dn). This is compared with a predetermined time (tAD) during which a difference is obtained which provided with a sign is totaled in a summation memory. An adaptation value is stored in a correction value memory when the summation memory exceeds a limit value. As consequence of this, the disconnection pressure level (pAB) of the first clutch (K1) is adapted in subsequent gear shifts.