Patent ID: 8924113
Filing Date: 2014-12-30
Classification: B60W,F16H

Abstract:
1. A method for operating a transmission of a motor vehicle that comprises a plurality of shifting elements including at least one interlocking shifting element and a plurality of friction shifting elements, in each engaged gear, a first number of the shifting elements of the transmission are either closed or engaged and a second number of the shifting elements of the transmission are either open or disengaged, and when carrying out a gearshift from a currently engaged gear to a target gear at least one of the shifting elements is either opened or disengaged and at least one of the shifting elements is either closed or engaged, and if, to carry out the gearshift, one interlocking shifting element has to be either closed or engaged, a synchronization of the one interlocking shifting element by at least partially closing or engaging one friction shifting element with redundancy in the transmission is only permitted provided that a current driving speed of the motor vehicle is lower than a corresponding limit value, the method comprising the steps of: monitoring actuation of the shifting elements of the transmission and the driving speed of the motor vehicle for monitoring a possible malfunction; comparing an intermediately stored, non-actual driving speed of the motor vehicle with the corresponding limit value, if, on a basis of the monitored actuation of the shifting elements of the transmission, it is concluded that there is a redundancy in the transmission; and if the intermediately stored, non-actual driving speed of the motor vehicle is higher than the corresponding limit value, eliminating the redundancy in the transmission.