Zf Friedrichshafen Ag

Rico Glöckner

Jürgen Legner

Marcus Hiemer

Stephan Schinacher

Migen Bebeti

Jan-Frederik Kuhn

Stefan Traub

Robert Morrison

Jan Döring

Michael Siber

Norbert Feuchtner

Lukas Jäger

Xiaoting Zhu

Johannes Kugler

Andreas Rothmund

Raphael Zohner

Alexey Rudolf

Andreas Weber

A traction drive system for a work machine, including at least one electric motor, a transmission, and a controller. The controller 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. The change to be expected in the motor output is conditional on a change in the gear ratio of the transmission. The change to be expected in the motor output is determined on the basis of at least one operating parameter of the work machine.

Traction drive system and method for operating a traction drive system

A method for monitoring an output speed of an electric drivetrain of a self-propelled work machine, including inputting an actual value for a longitudinal tilt of the self-propelled work machine and inputting an actual value for the output speed. The method further includes establishing a characteristic curve of a limit value for the output speed as a function of the longitudinal tilt of the self-propelled work machine and verifying whether, according to the input actual value for the longitudinal tilt, the input actual value for the output speed exceeds the limit value established in the characteristic curve. The method further includes outputting a control signal for bringing about an operationally safe state of the electric drivetrain according to a verification result based on the verification step.

Output speed monitoring for an electric drive train

A method for adaptively setting a shift point of a multi-speed powershift transmission of a working machine that includes an electric drive system and a control device. The electric drive system has a battery and an electric motor. The multi-speed powershift transmission is connected to the electric drive system. The control device is connected to the electric drive system and the multi-speed powershift transmission in a signal-effective manner. The method includes 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, and determining based on the state variable and the specified tractive force, a driving speed at which the specified tractive force is essentially maintained during the shifting operation. The method includes setting the shift point at the determined driving speed and carrying out the shifting operation at the shift point.

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

A method for operating an electrified drive train, the drivetrain including a driving coupling of an electric motor to at least one wheel of a working machine, the method including generating an acceleration torque by the electric motor, the acceleration torque leading to an increase in speed of the at least one wheel, generating a braking torque, the braking torque leading to a reduction in speed of the at least one wheel, generating a second acceleration torque by the at least one wheel, the second acceleration torque leading to an increase in a speed of the electric motor, and generating a second braking torque by the at least one wheel, the second braking torque leading to a reduction in the speed of the electric motor, wherein, during a regenerative operation of the electric motor, an unwanted acceleration of the working machine is counteracted by an automated additional braking intervention.

Method for operating an electrified drive train for a working machine, electrified drive train for a working machine and working machine

The disclosure relates to a method for controlling a flow of electrical power between an electrical energy source and at least two electric machines of a working vehicle. In one step, an electrical power which can be drawn from the energy source is determined. In a further step, at least two electrical powers which are required for the at least two electric machines are determined. In yet another step, the electrical power which can be drawn is distributed to the at least two electric machines in the ratio of the at least two required electrical powers, such a distribution being carried out if the sum of the at least two required electrical powers is greater than the electrical power which can be drawn. The disclosure also relates to a controller for carrying out the described method and to a working vehicle having such a controller.

Method and controller for controlling the flow of electrical power in a working vehicle

The disclosure relates to a method for operating a drive train of a working machine, wherein the drive train comprises a working drive and a travel drive. The working drive is driven by a first electric motor and the travel drive is driven by a second electric motor. The disclosed method includes that the travel drive is additionally driven by the first electric motor if at least one performance criterion of said travel drive has been met. The disclosure further relates to a corresponding drive train and to a working machine.

Method for operating a drive train of a working machine, drive train for a working machine, and working machine

A powertrain arrangement of a working machine, including a first and second electric motor, frame component, and transmission, the first and second electric motor being connected to the transmission for transmitting torque. The frame component forms a receiving space, in which the first and second electric motor and the transmission are accommodated. The frame component has a rear axle casing section configured to rotatably bear a universal-joint shaft connecting the transmission to a rear axle. The frame component has a top-side frame section, which is arranged adjacent to a cab floor in a vertical direction. The first and second electric motor are arranged next to each other in a transverse direction and at least partially at a same level in the vertical direction. The first and second electric motor are arranged above the rear axle casing section and below the top-side frame section in the vertical direction.

Powertrain arrangement of a work machine and a work machine

The disclosure relates to a method for operating a drivetrain for a work machine, wherein a first electric motor drives a work drive of the work machine via a first transmission arrangement, wherein a second electric motor drives a traction drive of the work machine via a second transmission arrangement, and wherein, during a shift process of the second transmission arrangement from a relatively low gear ratio stage to a relatively high gear ratio stage, the rotational speed of the second electric motor is reduced. The method according to the disclosure is distinguished by the fact that, during the shift process, a driving connection is produced between the first electric motor and the second transmission arrangement by a first clutch, such that, during the shift process, the first electric motor drives the traction drive. The disclosure furthermore relates to a corresponding drivetrain and to a work machine.

Method for operating a drivetrain for a work machine, drivetrain for a work machine, and work machine

A method for operating a drive train for a mobile machine, including a first electric motor driving a working drive of the mobile machine via a first transmission arrangement, and a second electric motor driving a propulsion drive of the mobile machine via a second transmission arrangement, wherein a rotational speed of the second electric motor increases during a shifting operation of the second transmission arrangement out of a higher gear stage into a lower gear stage, and wherein during the shifting operation, a drive connection is established via a first clutch between the first electric motor and the propulsion drive, such that the propulsion drive is driven by the first electric motor during the shifting operation.

Growing community of inventors

Pocking, Germany

Rico Glöckner