US 12,264,738 B1
Method for adaptively determining a shifting point of a multi-gear powershift transmission of a working machine, control unit, computer program product and working machine
Rico Glöckner, Pocking (DE); and Jan Döring, Passau (DE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Appl. No. 18/838,278
Filed by ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
PCT Filed Feb. 14, 2023, PCT No. PCT/EP2023/053568
§ 371(c)(1), (2) Date Aug. 14, 2024,
PCT Pub. No. WO2023/156361, PCT Pub. Date Aug. 24, 2023.
Claims priority of application No. 10 2022 201 606.8 (DE), filed on Feb. 16, 2022.
Int. Cl. F16H 61/02 (2006.01); E02F 9/20 (2006.01); F16H 59/44 (2006.01); F16H 59/50 (2006.01); F16H 61/00 (2006.01)
CPC F16H 61/0213 (2013.01) [E02F 9/207 (2013.01); E02F 9/2079 (2013.01); F16H 59/44 (2013.01); F16H 59/50 (2013.01); F16H 2061/0087 (2013.01); F16H 2061/0223 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for adaptively setting a shift point of a multi-speed powershift transmission of a working machine, wherein the working machine comprises the multi-speed powershift transmission, an electric drive system and a control device, wherein the electric drive system has a battery and an electric motor, wherein the multi-speed powershift transmission is operatively connected to the electric drive system, wherein the control device is connected to the electric drive system and the multi-speed powershift transmission such that data and signals are capable of being exchanged, the method comprising:
specifying a tractive force which must be present during shifting operations of the multi-speed powershift transmission;
determining a state variable of the electric drive system;
determining based on the state variable and the specified tractive force, a driving speed of the working machine at which the specified tractive force is essentially maintained during the shifting operation;
setting the shift point at the determined driving speed; and
carrying out the shifting operation at the shift point when the working machine has the determined driving speed.