Method of determining the parameters of an automatic transmission

A method for determining parameters of an electrohydraulically controlled automatic transmission (4) comprising the steps of:

• initiating successive transmission gearshifts on a final test bench;
• measuring, during the gear shifts, as a function of time, a value for at least one of a transmission input speed (nT), a transmission output speed (nAB), a transmission input moment (M.sub.-- in), and a transmission output moment (M.sub.-- out);
• determining from said at least one measured value, parameters of the automatic transmission for controlling a clutch to be engaged during the gear change, the parameters consisting of, a filling time (tFull), a charge pressure (pFull), a reaction time (tRE), a friction value of the discs, and a pressurized fluid charge;
• storing the parameters in a memory (9) so that an electronic control unit corrects, in accordance with said parameters, a pressure level and time of a rapid filling pressure (pSF), the pressure level and the charge pressure (pFull), and the pressure level of a shift pressure (pSch), the shift pressure decisively determining the pressure level during upshift, downshift and overlapping shifts and gear introduction;
• and
• wherein the parameters are additionally determined at a minimum (.THETA.MIN) and maximum (.THETA.MAX) temperature, a temperature characteristic line being determined therefrom so that the electronic transmission control unit corrects, in accordance with said parameters and characteristic line, the pressure level and the time of the rapid filling pressure (pSF), the pressure level and the charge pressure (pFull), and the pressure level of the shifting pressure (Psch), the shifting pressure decisively determining the pressure level during upshifts, downshifts and overlapping shifts and gear charge.