Abstract: A drive for a work machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The computer is configured to process signals which correspond to control of a movement of a lifting mechanism of the work attachment or a bucket of the work attachment. The computer is further configured to process a signal which corresponds to a position of an accelerator pedal. The first electric motor and the second electric motor are configured to be controlled separately from each another, and control of the second electric motor takes place according to the control of the movement of the work attachment.

Abstract: A powertrain for a work machine, including at least one electric motor, an electric energy store, a multi-stage manual transmission, a heating circuit, and a cooling circuit. The at least one electric motor is configured to provide a mechanical input power. The manual transmission is configured to convert the mechanical input power and provide it as mechanical output power. The energy store is configured to supply the at least one electric motor and the heating circuit with electric power. The heating circuit is configured to provide a heating fluid for heating the energy store. The cooling circuit is configured to provide a cooling fluid for cooling and lubricating the manual transmission. The heating circuit and the cooling circuit are coupled via a heat exchanger and have only a single joint cooling device.

Abstract: A method for operating a drive train of a working machine, wherein a traction drive of the drive train is driven by an electric traction motor via a transmission and wherein, when a gear stage of the transmission is changed, a rotational speed of the traction motor is synchronised with the gear stage being engaged. The method further includes a computational model of the traction motor that is used for the rotational speed synchronisation. The model, taking into account a moment of inertia of the traction motor, describes a torque to be delivered for the rotational speed synchronisation. A corresponding drive train and a working machine is also disclosed.

Abstract: A drive for a machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The second electric motor is configured to drive at least one hydraulic pump with an adjustable stroke volume. A sensor is configured to detect the stroke volume of the pump. The computer processes the stroke volume to control the second electric motor.

Abstract: A method for operating an electric drivetrain of a working machine is provided wherein the drivetrain comprises a work drive with an electric work motor and a travel drive with an electric travel motor and vehicle wheels, wherein the working machine experiences a speed deceleration from the outside that may result in a braking force acting on the vehicle wheels lower than a driving force acting on the vehicle wheels due to a moment of inertia of the travel motor. The method includes supplying the travel motor with a power in a direction opposite to an operating direction of the travel motor in order to reduce a rotational speed of the travel motor, if it is detected in advance using a situation detection that the braking force acting on the vehicle wheels as a result of the speed deceleration is lower than the driving force acting on the vehicle wheels.

Abstract: A propulsion drive system for a mobile machine includes an electric motor having a first range, in which a torque is constant as a rotational speed rises, and a second range, in which a power is constant as the rotational speed rises. The propulsion drive system further includes a transmission operatively connected mechanically to the electric motor. The propulsion drive system is configured to be transferred, via the transmission, from a state for relatively low driving speeds into a state for relatively high driving speeds of the mobile machine. The electric motor and the transmission are adapted to one another in such a way that the electric motor can be operated in the state for relatively low driving speeds exclusively in the first and second range.

Abstract: 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.

Abstract: A process for determining a setpoint rotational speed of a work machine engine, having a continuously variable transmission, based on operation of power hydraulics. The setpoint rotational speed for highly productive operation is determined, without knowledge current operation of the power hydraulics, by a basic engine speed setting. With knowledge of the current operating state, the setpoint rotational speed is determined by the basic speed settings and low or high engine speed settings. The low speed setting alone determines setpoint rotational speeds that are lower than the basic speed setting or a combination of the low and basic speed settings. The high speed setting alone determines setpoint rotational speeds that are higher than the basic speed setting or a combination of the basic and high speed settings. The speed settings can comprise a setpoint rotational speed range of above a reciprocal transmission range of the variable transmission.

Abstract: The disclosure relates to a method for operating a drive train of a working machine, wherein a traction drive of the drive train is driven by an electric traction motor via a transmission and wherein, when a gear stage of the transmission is changed, a rotational speed of the traction motor is synchronised with the gear stage being engaged. The method according to the disclosure further includes a computational model of the traction motor that is used for the rotational speed synchronisation. The model, taking into account a moment of inertia of the traction motor, describes a torque to be delivered for the rotational speed synchronisation. The disclosure further relates to a corresponding drive train and to a working machine.

Abstract: 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.

Abstract: A drive for a work machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The computer is configured to process signals which correspond to control of a movement of a lifting mechanism of the work attachment or a bucket of the work attachment. The computer is further configured to process a signal which corresponds to a position of an accelerator pedal. The first electric motor and the second electric motor are configured to be controlled separately from each another, and control of the second electric motor takes place according to the control of the movement of the work attachment.

Abstract: A drive for a machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The second electric motor is configured to drive at least one hydraulic pump with an adjustable stroke volume. A sensor is configured to detect the stroke volume of the pump. The computer processes the stroke volume to control the second electric motor.

Abstract: A traction force limiting device for a working machine with a continuously variable transmission that comprises a variator for adjusting the rotational speed ratio of the transmission independently of the torque ratio of the transmission. The traction force limiting device has a traction force interface for providing information to determine a traction force of the working machine, a limit value interface for setting a traction force limit value of the working machine and a control interface for emitting a control signal to the variator. Additionally, the traction force limiting device has a computer unit designed, on a basis of information provided via the traction force interface, to determine the traction force, to compare the traction force determined with the traction force limit value set via the limit value interface, and to control the variator in such manner that the traction force does not exceed the traction force limit value.

Abstract: A traction force limiting device for a working machine with a continuously variable transmission that comprises a variator for adjusting the rotational speed ratio of the transmission independently of the torque ratio of the transmission. The traction force limiting device has a traction force interface for providing information to determine a traction force of the working machine, a limit value interface for setting a traction force limit value of the working machine and a control interface for emitting a control signal to the variator. Additionally, the traction force limiting device has a computer unit designed, on a basis of information provided via the traction force interface, to determine the traction force, to compare the traction force determined with the traction force limit value set via the limit value interface, and to control the variator in such manner that the traction force does not exceed the traction force limit value.

Abstract: A propulsion drive system for a mobile machine includes an electric motor having a first range, in which a torque is constant as a rotational speed rises, and a second range, in which a power is constant as the rotational speed rises. The propulsion drive system further includes a transmission operatively connected mechanically to the electric motor. The propulsion drive system is configured to be transferred, via the transmission, from a state for relatively low driving speeds into a state for relatively high driving speeds of the mobile machine. The electric motor and the transmission are adapted to one another in such a way that the electric motor can be operated in the state for relatively low driving speeds exclusively in the first and second range.

Abstract: A process for determining a setpoint rotational speed of a work machine engine, having a continuously variable transmission, based on operation of power hydraulics. The setpoint rotational speed for highly productive operation is determined, without knowledge current operation of the power hydraulics, by a basic engine speed setting. With knowledge of the current operating state, the setpoint rotational speed is determined by the basic speed settings and low or high engine speed settings. The low speed setting alone determines setpoint rotational speeds that are lower than the basic speed setting or a combination of the low and basic speed settings. The high speed setting alone determines setpoint rotational speeds that are higher than the basic speed setting or a combination of the basic and high speed settings. The speed settings can comprise a setpoint rotational speed range of above a reciprocal transmission range of the variable transmission.

Abstract: A drive-train has an internal combustion engine (1) with an exhaust gas turbocharger, which drives a vehicle wheel (3) by way of a power-branching transmission (2). When there is an increase of the power demanded from the combustion engine (1) but the exhaust gas turbocharger is not yet producing the required charging pressure, an additional motor (4) is always switched into the drive-train in order to deliver torque to the drive-train.

Abstract: A device for controlling a gear ratio of a hydrostatic mechanical power-split transmission comprises an input switch (1) which, when rotated, produces a particular transmission characteristic and, at the same time, limits the maximum pressure. The selected position of the input switch (1) selects a particular maximum pressure curve from a large number of stored maximum pressure curves.

Abstract: A method for the operation of a vehicle drive-train of a working machine having a drive motor, a transmission whose transmission ratio can be varied continuously, and a drive output. A rotational speed (nmot) of the drive motor can be varied by the driver, by the driver's actuation of a first control element (50), within a rotational speed range (53) delimited by an upper characteristic line (nmoto) and a lower characteristic line (nmotu). The characteristic lines (nmoto, nmotu) are functions of a reciprocal transmission ratio (irez) of the transmission. Furthermore, the rotational speed (nmot1) of the drive motor that can be set by the driver by way of the first control element (50), can be influenced by the driver's actuation of a second control element (51) and as a function of an operating condition of the working machine.

Abstract: With a torque-controlled internal combustion engine and a variable-speed transmission having fixed shift gear ratios, during a shift, the internal combustion engine is controlled in such manner that the drive output torque of the transmission remains the same before and after the shift.