US 12,454,184 B2
Method and control device for operating a vehicle driveline
Johannes Glückler, Friedrichshafen (DE); Christian Mittelberger, Ravensburg (DE); Stefan Spühler, Friedrichshafen (DE); and Morten Scherpelz, Tettnang (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Aug. 31, 2023, as Appl. No. 18/240,537.
Claims priority of application No. 10 2022 209 050.0 (DE), filed on Aug. 31, 2022.
Prior Publication US 2024/0066997 A1, Feb. 29, 2024
Int. Cl. B60L 3/00 (2019.01); B60L 3/06 (2006.01); B60L 15/20 (2006.01)
CPC B60L 15/20 (2013.01) [B60L 3/06 (2013.01); B60L 2240/423 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for operating a powertrain of a vehicle, the powertrain comprising a first electrical machine with a first power electronics and a second electrical machine with a second power electronics, the method comprising:
operating the powertrain in a non-symmetrical operation of the electrical machines wherein the first electrical machine and the second electrical machine are loaded or operated with a different torque and/or with a different torque gradient;
changing operation of the powertrain to a symmetrical operation of the electrical machines in which the first electrical machine and the second electrical machine are loaded or operated with an equal torque and with an equal torque gradient; and
operating the powertrain subsequently according to a modified operation in which one machine of the electrical machines previously operated in the non-symmetrical operation with a higher torque and/or with a higher torque gradient, is loaded or operated with a limited torque and/or with a limited torque gradient or is switched off or decoupled for a defined period of time in order to at least partially compensate for a different aging of first and second electrical machines and first and second power electronics caused by the non-symmetrical operation.