METHOD FOR DETERMINING A SHIFTING STEP FOR A DISCRETELY SHIFTING TRANSMISSION OF A MOTOR VEHICLE

摘要

A method for determining a shift stage (transmission ratio) for a discretely shifting transmission of a motor vehicle wherein an output rpm of the transmission is detected and an optimal motor rpm is pregiven.It is provided that computed and/or measured input rpms (22, 23) of the transmission are detected. An rpm (25, 26) for each shift stage is fixed via a hysteresis circuit (24), a difference of the input rpm (22) of a next-higher shift stage and the rpm (26) supplies an upshift limit (10) and a sum of current input rpm (23) and the rpm (25) supplies a downshift limit (12); and, shifting into a higher shift stage takes place when the upshift limit (10) exceeds the optimal motor rpm (28) or shifting into a lower shift stage takes place when the optimal motor rpm (28) exceeds the downshift limit (12) (shifting necessity (27)).