Patent ID: 8311712
Filing Date: 2012-11-13
Classification: F16H,Y10T

Abstract:
1. A method of operation of a drivetrain of a motor vehicle comprising at least an automatic transmission having an input shaft, an output shaft and four planetary gear sets and a drive motor, such that successive upshifts or successive downshifts can be carried out with overlap in such manner that during a first upshift or a downshift at least one shift element required for a subsequent, second upshift or downshift is prepared during the first upshift or downshift in progress in such a manner that when a synchronization point of the first upshift or downshift in progress is reached, the subsequent second upshift or downshift can be carried out immediately, the method comprising the steps of: in an automatic transmission with at least five shift elements, of which, for torque or force transfer, disengaging at most two shift elements in any forward gear and in a reverse gear while the other shift elements being engaged, during the implementation of at least one of a first upshift, a first downshift, a second, subsequent upshift a second, subsequent downshift, one of increasing and decreasing a torque of the drive motor, relative to a drive motor torque derived from a driver's wish, in order to support the overlapped implementation of successive upshifts or downshifts.