Patent ID: 8068964

Claim:
A method for determining driving resistance of a motor vehicle during a shift operation of an automated shift transmission from a load gear to a target gear to alter the shift operation depending on the determined driving resistance and a type of the shift operation implemented, the method comprising the steps of: determining a first driving resistance value (F_fw — 1) before the shift operation begins initiating either a traction type of shift operation or a thrust type of shift operation; measuring, over a time interval (Δt) which contains a traction-force-free phase of the shift operation, a plurality of discrete acceleration values (a_i) of current acceleration (a) of the motor vehicle, determining from the plurality of discrete acceleration values (a_i) either a minimum acceleration value (a_min), if the traction type of shift operation is initiated, or a maximum acceleration value (a_max), if the thrust type of shift operation is initiated; and; calculating a second driving resistance value (F_fw — 2) during the shift operation using a mass (m) of the vehicle and either a first formula, if the traction type of shift operation is initiated, or a second formula, if the thrust type of shift operation is initiated, the first formula being: F_fw — 2=−m*a_min, and the second formula being: F_fw — 2=−m*a_max; and adjusting the shift operation based on a difference between the first driving resistance value and the second driving resistance value (ΔF_fw=F_fw — 2−F_fw — 1).