Patent ID: 11878675
Assignee: ZF FRIEDRICHSHAFEN AG
Field: Transport (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 9:
10. A drive train for a working machine, comprising a traction drive having an electric traction motor and a traction transmission, and a working drive having an electric working motor and a working transmission, wherein the traction drive can be driven by the traction motor via the traction transmission and wherein the working drive can be driven by the working motor via the working transmission, and wherein, during a gear stage change of the traction transmission, a speed synchronization of the traction motor with the gear stage to be engaged is carried out, wherein the drive train further comprises a connecting clutch via which a drive connection can be established between the traction drive and the working drive and an electronic control unit which is configured to calculate a computational model of the traction motor which, while taking account of a moment of inertia of the traction motor, determines a torque to be applied by friction between the traction motor and a clutch of the gear stage for the speed synchronization; and wherein a drive connection between the working drive and the traction drive is provided such that the traction drive is selectively driven in a supporting manner by the working motor whenever it is thereby possible to achieve an improvement in an overall efficiency of the drive train compared to when the traction drive is driven solely by the traction motor.