US 12,460,718 B2
Traction drive system and method for operating a traction drive system
Rico Glöckner, Pocking (DE); Jan Döring, Passau (DE); and Johannes Kugler, Friedrichshafen (DE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Appl. No. 18/704,502
Filed by ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
PCT Filed Nov. 3, 2022, PCT No. PCT/EP2022/080637
§ 371(c)(1), (2) Date Apr. 25, 2024,
PCT Pub. No. WO2023/078975, PCT Pub. Date May 11, 2023.
Claims priority of application No. 10 2021 212 421.6 (DE), filed on Nov. 4, 2021.
Prior Publication US 2024/0328507 A1, Oct. 3, 2024
Int. Cl. F16H 61/02 (2006.01); F16H 59/44 (2006.01); F16H 59/48 (2006.01); F16H 59/50 (2006.01); F16H 59/66 (2006.01); F16H 59/78 (2006.01); F16H 61/16 (2006.01)
CPC F16H 61/0213 (2013.01) [F16H 59/44 (2013.01); F16H 59/48 (2013.01); F16H 59/50 (2013.01); F16H 59/66 (2013.01); F16H 59/78 (2013.01); F16H 61/16 (2013.01); F16H 2061/022 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A traction drive system for a work machine, comprising:
at least one electric motor;
a transmission; and
a controller which is configured to select a gear ratio of the transmission depending on a change to be expected in a motor output of the at least one electric motor, each gear ratio providing mechanical connection of the transmission to both a traction drive and a work drive of the work machine,
wherein the change to be expected in the motor output is conditional on a change in the gear ratio of the transmission,
wherein the change to be expected in the motor output is determined on a basis of at least one operating parameter of the work machine, and
wherein the change to be expected in the motor output is determined based on a simulation performed by the controller,
wherein the at least one operating parameter is selected from a group consisting of a speed of the work machine, a change in the speed of the work machine, and a change in electrical energy which is output from an electrical energy source for supplying the at least one electric motor with energy,
wherein the controller is configured to select at least two different gear ratios of the transmission, and
wherein the controller is configured to select a second gear ratio which is different from a first gear ratio of the transmission when the change to be expected in the motor output is below a predetermined threshold value.