Patent ID: 8165766
Filing Date: 2012-04-24
Classification: B60W,Y10T

Abstract:
1. A method for controlling a drivetrain of a vehicle with a prime mover and a transmission with ratios (i_ist) that are automatically varied within a ratio range in at least one of a continuous manner and a stepped manner as function of target speeds (v_ziel), which are preset via a vehicle speed control, and a vehicle inclination, calculated at any time, relative to a longitudinal axis of the vehicle, the method comprising the steps of: generating a request to change a current transmission ratio (i_ist) when the vehicle speed control is activated and an actual speed of the vehicle (v_ist) is different from a preset target speed (v_ziel), and when a determination has been made that an output torque applied to an output of the drivetrain is less than one of an output torque threshold value and an output torque required to adjust the preset target speed (v_ziel); varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to the output of the drivetrain approaches the output torque required to approach the target speed (v_ziel); starting a first timer (TIMER determining and evaluating, during the first timer (TIMER omitting an additional increase of the current transmission ratio (i_ist) of the vehicle when the actual speed of the vehicle (v_ist) changes after an increase of the current transmission ratio (i_ist) and approaches the target speed (v_ziel), with changes in the actual speed of the vehicle (v_ist) being associated with the actual acceleration of the vehicle; and altering the output torque of the vehicle, after a change of the current transmission ratio (i_ist) by changing an input torque of the prime mover.