US 12,241,547 B2
Method and control apparatus for operating a transmission of a motor vehicle
Ulf Lang, Aidlingen (DE); and Jürgen Blaser, Meckenbeuren (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Dec. 19, 2023, as Appl. No. 18/545,135.
Claims priority of application No. 10 2022 214 070.2 (DE), filed on Dec. 20, 2022.
Prior Publication US 2024/0200652 A1, Jun. 20, 2024
Int. Cl. F16H 61/70 (2006.01); F16H 47/08 (2006.01); F16H 59/40 (2006.01); F16H 59/54 (2006.01); F16H 59/72 (2006.01); F16H 61/04 (2006.01); F16H 61/682 (2006.01); F16H 59/68 (2006.01)
CPC F16H 61/0403 (2013.01) [F16H 47/08 (2013.01); F16H 59/40 (2013.01); F16H 59/54 (2013.01); F16H 59/72 (2013.01); F16H 61/682 (2013.01); F16H 61/70 (2013.01); F16H 2059/6823 (2013.01); F16H 2061/047 (2013.01); F16H 2061/0474 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for operating a transmission arranged in a drivetrain of a motor vehicle between a drive aggregate and a drive output, the method comprising:
providing the transmission comprising
a hydrodynamic starting element;
a powershiftable main transmission having a plurality of forward gears, at least one reversing gear, and a plurality of frictional shifting elements, wherein in each gear a first number of shifting elements are closed and a second number of shifting elements are open; and
a downstream range group connected downstream from the main transmission, the downstream range group comprising at least one interlocking shifting element (and configured be shifted between a first driving range, a second driving range, and a neutral position;
running the drive aggregate with the motor vehicle at a standstill or in a speed range close to standstill and with the main transmission in neutral;
receiving a shift request to change the downstream range group;
partially closing the shifting elements of a reversing gear in the main transmission; and
subsequently changing the driving range of the downstream range group.