Control device and method for operating a dual-clutch transmission of a motor vehicle
AssigneeAudi AG
InventorsAndreas Birk, Mathias Weinhardt
Life of this patent
Estimating the term…
Abstract
A method for operating a dual-clutch transmission of a motor vehicle, wherein a first clutch is operated closed or engaged and in this way a first transmission branch is driven, in which a current actual gear is engaged, and in a pre-selection phase for a gear changed to a desired gear in a second transmission branch, the desired gear is engaged, and in a second clutch, a clutch hydraulic system is filled and, in this way, the second clutch is closed. The gear change shall be made faster. The filling of the clutch hydraulic system is begun already during the pre-selection phase, and, in this case, the clutch hydraulic system is filled in the pre-selection phase but at most up to reaching a touch point of the second clutch.
Claims18
A method for operating a dual-clutch transmission of a motor vehicle, comprising:
- operating a first clutch that is closed or engaged by a filled first clutch hydraulic system and, in this way, a first transmission branch is driven, in which a current actual gear is engaged, so that a torque is transmitted from a crank shaft of an engine to a transmission output,
- operating a second clutch that is open or disengaged by a second clutch hydraulic system drained up to a stop setting, and
- in a pre-selection phase for a gear change to a desired gear in a second transmission branch, a rotational motion of the desired gear is synchronized with the transmission output, and the synchronized desired gear is unlocked and engaged, and
- in the second clutch, the second clutch hydraulic system is filled and, in this way, the second clutch is closed up to a touch point starting from which the second clutch transmits a torque from the crank shaft to the second transmission branch, and beyond,
- wherein the filling of the second clutch hydraulic system has begun already during the pre-selection phase and the second clutch hydraulic system is filled in the pre-selection phase at most until reaching a touch point of the second clutch.
Dependencies are inferred from the claim text.