Method for operating a drive train of a motor vehicle

A method for operating a drive train of a motor vehicle having a drive motor, a variable speed automatic transmission, and at least one control device for actuating the drive motor, said method comprising:

• the control device processing a rotational speed of the drive motor;
• when there is an actuated change in rotational speed of the drive motor from a starting rotational speed to a target rotational speed during a neutral position of the variable speed transmission, establishing current profile parameters of the change in rotational speed;
• and
• thereafter, using pre-stored profile parameters and current profile parameters, determining corrected profile parameters by which a profile of rotational speed of the drive motor in selected operating states is calculated in advance;
• and
• wherein, the corrected profile parameters are determined as a function of at least one of the starting rotational speed and the target rotational speed.

A method for operating a drive train of a motor vehicle having a drive motor, variable speed automatic transmission, and at least one control device for actuating the drive motor, said method comprising:

• the control device processing a rotational speed of the drive motor;
• when there is an actuated change in rotational speed of the drive motor from a starting rotational speed to a target rotational speed during a neutral position of the variable speed transmission, establishing a current gradient of the change in rotational speed;
• using a previously stored gradient value and the current gradient, determining a corrected gradient;
• establishing a current reaction time as a time period between an actuation time and a time at which a change in a status variable of the drive train exceeds an adjustable limiting value;
• determining a corrected reaction time using a previously stored reaction time and the current reaction time;
• and
• calculating in advance a profile of the rotational speed of the drive motor, using the corrected gradient and the corrected reaction time in selected operating states.

A method for operating a drive train of a motor vehicle having a drive motor, a variable speed automatic transmission and at least one control device for actuating the drive motor, and for processing a rotational speed of the drive motor, wherein in an initial operation of the drive train:

• the control device actuates the drive motor in such a way that changes in rotational speed occur;
• profile parameters of the changes in rotational speed are determined;
• and
• the profile parameters which are determined are stored.