Patent ID: 7285074
Filing Date: 2007-10-23
Classification: B60W,F16H,G01P,Y10S,Y10T

Abstract:
1. A method for controlling a motor vehicle drive train, the method which comprises: providing a first sensor unit on an output side of a drive train, the first sensor unit including a sensor wheel fastened to a rotatable component on the output side of the drive train and including two rotational speed sensors provided circumferentially adjacent to one another and fixed with respect to a housing, the two rotational speed sensors being provided at an effective distance from the sensor wheel of the first sensor unit and being connected to an evaluation unit via signal lines; providing a second sensor unit on an input side of the drive train, the second sensor unit including a sensor wheel fastened to a rotatable component on the input side of the drive train and including a rotational speed sensor provided fixedly with respect to a housing, at an effective distance from the sensor wheel of the second sensor unit and being connected to the evaluation unit via a signal line; evaluating sensor signals from the first sensor unit provided on the output side of the drive train and determining, by using the evaluation unit, a direction of rotation of the drive train from codirectional edge changes of the sensor signals; evaluating a sensor signal from the second sensor unit for accelerating a determination of the direction of rotation of the drive train; and selectively activating and deactivating a safety and comfort function in dependence of a determined direction of rotation of the drive train wherein a distinction is made between one of rotational states and driving states of a clockwise rotation of the drive train corresponding to a forward movement of a motor vehicle, a counterclockwise rotation of the drive train corresponding to a reverse movement of the motor vehicle and an undetected direction of rotation of the drive train corresponding to one of a vehicle standstill and an undetected vehicle movement.