| 摘要 |
Method for executing a gearshift in an automatic transmission (1) with several shifting elements, whereas, upon the execution of the gearshift, a first frictional-locking shifting element (B, C, D, E) is open or switched off and a second positive-locking shifting element (A, F) is closed or switched on, whereas, if, upon the execution of the gearshift, an input torque of the automatic transmission is then smaller than a threshold value, in particular upon the execution of a coast downshift, after at least the partial opening of the frictional-locking shifting element (B, C, D, E) and after the release of the positive-locking shifting element (A, F), there is a monitoring of whether the positive-locking shifting element (A, F) is transferred into its end position, whereas, if it is then determined that the positive-locking shifting element (A, F) has not been transferred into its end position, a torque transferred by the previously at least partially open frictional-locking shifting element (B, C, D, E) initially increases, and thereby there is an additional monitoring of whether the positive-locking shifting element (A, F) is transferred into its end position, and whereas if it is then determined that, despite the increase in the torque transferred by the frictional-locking shifting element (B, C, D, E), the positive-locking shifting element (A, F) has not been transferred into its end position, the operating pressure of the positive-locking shifting element (A, F) is then increased. |
| 主权项 |
1. Method for executing a gearshift in an automatic transmission with several shifting elements, whereas, upon the execution of the gearshift, a first frictional-locking shifting element is open or switched off and a second positive-locking shifting element is closed or switched on, characterized in that, if, upon the execution of the gearshift, an input torque of the automatic transmission is smaller than a threshold value, in particular upon the execution of a coast downshift, after at least the partial opening of the frictional-locking shifting element and after the release of the positive-locking shifting element, there is a monitoring of whether the positive-locking shifting element is transferred into its end position, whereas, if it is then determined that the positive-locking shifting element has not been transferred into its end position, a torque transferred by the previously partially open frictional-locking shifting element initially increases, and thereby there is an additional monitoring of whether the positive-locking shifting element is transferred into its end position, and whereby if it is then determined that, despite the increase in the torque transferred by the frictional-locking shifting element, the positive-locking shifting element has not been transferred into its end position, the operating pressure of the positive-locking shifting element is then increased. |
