Abstract: In a method for estimating a rotational speed curve of a shaft of a transmission of a motor vehicle after a synchronizing element which acts on the shaft has been deactivated the subsequent speed of the shaft, that is the curve of the rotational speed is estimated on the basis of the rotational speed of the shaft at the deactivation time and the rotational speed gradient at the deactivation time, taking into account a characteristic value (F) which is dependent on an activation period needed for the synchronizing element to accelerate the during activation of the synchronizing element, thereby providing for a particularly precise estimation of the rotational speed curve of the shaft.

Abstract: In a control for a motor vehicle transmission having a clutch and means for establishing and/or releasing an engagement of a toothing or of jaws of the motor vehicle transmission including a control unit for actuating the clutch for transmitting a torque to a first component of the toothing, the control unit being adapted, for the purpose of releasing a tooth-on-tooth position of the toothing, to briefly provide a control signal for adjusting the clutch to a desired clutch position (KS) in order to generate a torque pulse, the control unit determining a reaction of the motor vehicle transmission in response to the control signal from the control unit and adapting the desired clutch position (KS) as a function of the reaction.

Abstract: The invention is based on a device for activating a gear shift element (10) of a motor vehicle by means of a control pressure (p) which is provided for deflecting the gear shift element (10) from a resting position. It is proposed that a control unit (11) be provided for measuring, at least in one operating state, a characteristic variable (T) to determine a reaction of the gear shift element (10) to a change in the control pressure (p).

Abstract: The invention relates to a method for operation of a drive train having a drive machine and an automatic, unsynchronized gearwheel variable-speed transmission, which can be connected to the drive machine by means of an automatic clutch. A control device carries out a selection process as a function of vehicle parameters and/or operating variables of the motor vehicle to determine whether a gear change of the unsynchronized gearwheel variable-speed transmission will be carried out with the clutch engaged or disengaged. In order to ensure reliable operation of the motor vehicle, for the method according to the invention, a gear change is carried out with the clutch disengaged in a time interval after initial starting up of the drive train and/or after starting of the drive machine and/or when a malfunction is identified in a component in the drive train.

Abstract: The invention relates to a method for operating a drive train having a drive machine and an automated variable speed transmission. In selected situations, for example when there is a change in the gear speed of the variable speed transmission, it is advantageous to calculate the profile of the rotational speed of the drive machine in advance. For this purpose, pre-stored profile parameters, for example in the form of gradient values when changes in rotational speed are requested, are corrected. In order to permit a particularly accurate calculation in advance, the corrected gradient is determined as a function of a requested difference in rotational speed. Alternatively, in addition to a corrected gradient it is possible to calculate a corrected reaction time and to carry out the calculation in advance by means of these variables. The reaction time is obtained as a time difference between actuation of a significant change in a state variable, for example a rotational speed, of the drive train.