Transmission configuration and method for controlling a transmission
A transmission configuration includes an automated dual-clutch transmission having two transmission sections with respective input shafts, respective output shafts and respective motor clutches. The motor clutches are connected, on a motor side thereof, to a drive shaft and to a respective one of the input shafts on a transmission side thereof. A drive-side speed sensor unit is disposed at the drive shaft. An input-side speed sensor configuration includes sensor wheels connected, fixed against relative rotation, to respective ones of the input shafts, and pulse sensors disposed stationary with respect to a housing and within an effective range of the respective sensor wheels. The input-side speed sensor configuration is configured to detect a speed of the input shafts and a direction of rotation of at least one of the input shafts. A method for controlling an automated dual-clutch transmission is also provided.
1. A method for controlling a transmission, the method which comprises:
providing an automated dual-clutch transmission with two transmission sections, each having a motor clutch connected on a motor side thereof, via a drive shaft, to a drive motor, an input shaft connected to the motor clutch on a transmission side thereof, and gear wheel sets forming a group of gear stages and each including a fixed gear and an idler gear, wherein a connection with a gear ratio between the input shaft and an output shaft can be established with the gear stages by in each case engaging a gear clutch assigned to the idler gear, wherein the output shaft forms a power take-off shaft connected to an axle drive or wherein the output shaft is permanently connected to such a power take-off shaft, and with a sensor configuration with at least a drive-side speed sensor unit disposed at the drive shaft, a first input-side speed sensor unit disposed at the input shaft of a first one of the transmission sections, and a second input-side speed sensor unit disposed at the input shaft of the second one of the transmission sections; and
determining a speed and a direction of rotation of the power take-off shaft by using an input-side speed sensor unit which is speed sensitive and sensitive to a direction of rotation, by first, with an opened motor clutch, engaging a gear stage of a transmission section including the input-side speed sensor unit, by ascertaining, with the input-side speed sensor unit, a speed and a direction of rotation of the input shaft of a respective transmission section, and by subsequently calculating a speed and a direction of rotation of the power take-off shaft from the speed and the direction of rotation of the input shaft with a gear ratio and, if applicable, a reversal of a direction of rotation of an engaged gear stage.
2. The method according to claim 1 , which comprises engaging a smallest one of the gear stages of the respective transmission section in order to achieve a maximum temporal resolution of a rotational motion of the power take-off shaft.
3. The method according to claim 1 , which comprises using an ascertainment of the speed and the direction of rotation of the power take-off shaft in a driving-off process in order to determine a vehicle movement.
4. The method according to claim 3 , which comprises determining a vehicle movement selected from the group consisting of a forward movement of a vehicle, a stopping of a vehicle, a backwards movement of a vehicle, and a movement speed of a vehicle.
5. The method according to claim 3 , which comprises engaging a driving-off gear stage for determining the vehicle movement, in case the input-side speed sensor unit, which is speed sensitive and sensitive to a direction of rotation, is assigned to a transmission section including the driving-off gear stage.
6. The method according to claim 3 , which comprises, in case the input-side speed sensor unit, which is speed sensitive and sensitive to a direction of rotation is assigned to a transmission section which does not include a driving-off gear stage, engaging a gear stage as an auxiliary gear stage in the transmission section which does not include the driving-off gear stage in order to determine the vehicle movement.
7. The method according to claim 6 , which comprises selectively disengaging the gear stage used as the auxiliary gear stage after finishing the driving-off process if, in a directly subsequent shift process, another gear stage is provided as a target gear stage and leaving the gear stage used as the auxiliary gear stage engaged if, in a directly subsequent shift process, the gear stage is provided as a target gear stage.