Patent ID: 7367919
Filing Date: 2008-05-06
Classification: F16H,Y10T

Abstract:
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.