| Patent application number | Description | Published |
|---|
| 20090249777 | TRANSMISSION DEVICE WITH AT LEAST ONE FORM-FIT SHIFTING ELEMENT BEING HYDRAULICALLY ACTUATED VIA A HYDRAULIC SYSTEM - A transmission device ( | 10-08-2009 |
| 20090250310 | TRANSMISSION APPARATUS COMPRISING AT LEAST ONE POSITIVE SHIFTING ELEMENT HYDRAULICALLY ACTUATED BY WAY OF A HYDRAULIC SYSTEM - A transmission apparatus ( | 10-08-2009 |
| 20090280951 | METHOD FOR OPERATING A VEHICLE DRIVETRAIN - A method for operating a vehicle drivetrain ( | 11-12-2009 |
| 20110263382 | METHOD FOR THE OPERATION OF A TRANSMISSION DEVICE - A method is described for the operation of a transmission device ( | 10-27-2011 |
| 20110284335 | METHOD FOR THE OPERATION OF A TRANSMISSION DEVICE OF A VEHICLE DRIVE TRAIN - A method of operating a transmission of a vehicle drive train with at least one drive machine. The transmission is formed with at least one interlocking shift element and a plurality of frictional shift elements in order to obtain various gear ratios. During an engaging process of the interlocking shift element, starting from a disengaged operating condition, in which halves of the interlocking shift element are out of engagement, to an engaged operating condition, in which the shift element halves are interlocked in a rotationally fixed manner, when interlock between the shift element halves is obstructed, a rotational speed difference is produced at least temporarily between the shift element halves, at which the interlock in the area of the interlocking shift element can be engaged. To produce the speed difference between the shift element halves, the transmission capacity of at least one frictional shift element is increased. | 11-24-2011 |
| 20110301819 | METHOD FOR OPERATING A TRANSMISSION WITH AT LEAST ONE POSITIVE-LOCKING SHIFTING ELEMENT - A method of operating a transmission ( | 12-08-2011 |
| 20120022752 | METHOD FOR OPERATING A VEHICLE DRIVE TRAIN - A method of operating a vehicle drive-train with an engine and a transmission during a gearshift in which an interlocking shift element is disengaged and a frictional shift element is engaged. Upon a shift command, the shifting time and a transmission input speed are monitored. If the input speed deviates from a synchronous speed equivalent to the gear ratio being disengaged, recognizing disengagement of the interlocking shifting element. If an engaged operating condition of the interlocking shifting element to be disengaged is detected, after the lapse of a time interval beginning with the shift command, a current drive torque of the drive machine is brought by motor actuation to a level that corresponds to a difference between the current transmission input torque and a torque that can be transmitted by the frictional shifting element to be engaged, operating with slip, plus a torque offset value. | 01-26-2012 |
| 20120029778 | METHOD FOR OPERATING A TRANSMISSION DEVICE WITH A PLURALITY OF FRICTION-LOCKING AND POSITIVE-LOCKING SHIFTING ELEMENTS - A method of operating a transmission device comprising friction-locking and form-locking shift elements for obtaining different gear ratios. A shift request for engaging a shift element undergoes a time delay dependent upon an operating state prior to a time of engagement of the shift element. A rotational speed differential between halves of the shift element lies within a rotational speed differential window required for the engagement procedure is assigned to the time of engagement. A gradient of the transmission input speed is ascertained at the time of the shift request, and the actual gradient is subsequently monitored and compared with the gradient that existed at the time of the shift request. If an absolute deviation greater than a threshold value is ascertained, the time delay is changed or an actuation of another shift element to be disengaged is varied such that the deviation is reduced below the threshold value. | 02-02-2012 |
