Patent ID: 6261204
Filing Date: 2001-07-17
Classification: F16H,Y10T

Abstract:
A method for adjustment of an overlapping upshift in an automatic transmission having a first opening clutch K1) and a second closing clutch (K2), the overlapping gear shift comprising two phases wherein during the first phase banking (dn) of transmission input rotational speed (nT) is adjusted by regulating the pressure level of said first clutch (K1) and during the second phase the second clutch (K2) takes over the load from said first clutch (K1), wherein upon issuance of the shift command the time period (t2) until the transmission input rotational speed (nT) has reached the banked rotational speed banking (dn) is detected, this is compared with a predetermined time (tAD) to obtain a difference (DIFF) (DIFF=tAD-t2), the difference provided with a sign is totaled in a summation memory (SUM DIFF)) and an adaptation value (dp) is stored in a correction value memory (KORR) when the summation memory (SUM(DIFF)) exceeds a limit value (.+-.GW) so that pressure level (pAB) of disconnection of said first clutch (K1) is adjusted for the subsequent gear shifts (pAB=pAB.+-.dp).