Robert Boschgmbh

Bosch Rexroth Ag

Brueninghaus Hydromatik Gmbh

Dana Rexroth Transmission Systems

Matthias Mueller

Steffen Mutschler

Norman Brix

Peter Schmuttermair

Ronny Herrmann

Martin Behm

Peer Mumcu

Martin Tenzer

Marcus Wegner

Markus Weber

Ulrich Lenzgeiger

Michael Frasch

Florian Muehlbauer

Heinz Hense

Erich Ilk

Tobias Mueller

Walter Scandella

Seppo Tikkanen

Sebastian Oschmann

Alexander Hoegerle

Franz Werner

Rolf Rathke

Christine Ehret

Sophia Karg

Georg Rausch

Veronica Arenas

Juergen Feig

Benjamin Wogrin

Christian Hagg

Alessandro Arcolia

Dieter Vogel

Abraham Barrera Villalpando

Manfred Gloeckler

Andreas Klyne

Hannes Klee

Ole Isfort

Andrea Alberti

A method teaches a control function, preferably a characteristic curve, of a hydrostatic motor of a traction drive of a work machine when in drive mode. The traction drive is provided with the hydrostatic motor and a hydrostatic pump, which is hydraulically connected to the hydrostatic motor. The method includes setting a pivot angle of the hydrostatic motor while taking into account a desired velocity of the work machine when in the drive mode, and checking whether predefined conditions are met. If the predefined conditions are met and a current velocity differs from the desired velocity, the method includes correcting the control function of the hydrostatic motor by taking into account a difference between the desired velocity and the current velocity. At least one value of the corrected control function of the hydrostatic motor is taught during the correcting.

Method for teaching the control function of hydrostatic motors when in drive mode

A monitoring system for a travel drive includes a rotational speed sensor of a hydrostatic motor. The rotational speed sensor is configured to determine acceleration. At least one signal from a pressure sensor mounted on at least one working line that connects a pump to the hydrostatic motor of a hydrostatic travel drive is evaluated. The pressure sensor is preferably arranged on at least one working connection of the pump. The system uses the additional pressure signal to evaluate in a reliable manner whether the hydrostatic travel drive generates an unwanted drive torque.

Electronic monitoring system for hydrostatic travel drives and travel drive with electronic monitoring system

In a hydraulic motor and a hydrostatic traction drive with such a hydraulic motor, the regulating of the displacement of the hydraulic motor is done via a pilot-operated pressure regulator. The feedforward controller calculates an estimated motor displacement and relays this to the pressure regulator.

Wheel drive assembly for a hydrostatic traction drive and hydrostatic traction drive

A hydrostatic travel drive includes a hydraulic pump for the purpose of supplying pressure medium to a hydraulic motor of the travel drive that can be coupled to an output, which pump can be coupled to a drive machine. The hydraulic pump has an actuating cylinder with at least one cylinder chamber and a swept volume which can be adjusted via the actuating cylinder, and at least one electrically activatable pressure valve via which the cylinder chamber can be charged with an adjustingly active actuating pressure. The travel drive further includes device via which a pressure of the hydraulic pump can be limited by means of influencing the actuating pressure.

Hydrostatic travel drive and method for controlling the hydrostatic travel drive

In a drive unit which has an axial piston pump and an electronic control unit, the axial piston pump is pivoted with a method in which pressure-reducing valves which act in opposition to one another are suddenly energized. Since in this respect no orifices are provided in the adjustment device, a so-called initiation jump of the excited current gives rise to a sudden reduction in the assigned actuating pressure or the actuating pressure difference formed therefrom. Then, a zero crossover jump of the excited current or of the excited currents is carried out in order to overcome the centering spring and therefore ensure a continuous zero crossover of the axial piston pump. Furthermore, a hydrostatic traction drive includes such a drive unit.

Method for controlling an axial piston pump and drive unit with such an axial piston pump and hydrostatic traction drive with such a drive unit

A hydraulic machine, in particular for a transmission arrangement, has an adjustable displacement volume and an adjusting device configured to adjust the displacement volume. The adjusting device is connected to a control unit so that the adjusting device is configured to be actuated in accordance with a setpoint value of the displacement volume. A transmission arrangement includes the hydraulic machine. A method for controlling the transmission arrangement is disclosed.

Hydraulic machine having an adjustable displacement volume, transmission arrangement having the hydraulic machine, and method for controlling the transmission arrangement

A battery system includes at least one lithium cell with an electrolyte having at least one polymer which is configured to be impregnated with an electrolyte fluid. In order to increase the capacity, the life and the safety of the battery system, the battery system further includes at least one electrolyte fluid metering device, by which at least one component of the electrolyte fluid can be supplied to the lithium cell and/or by which electrolyte fluid can be discharged from the lithium cell.

Electrolyte fluid metering device for lithium cells

A power-split transmission for a traction drive includes a hydraulic power branch and a further power branch. In order to control a velocity, a displacement volume of a hydraulic pump of the hydraulic power branch is configured to be adjusted by a hydraulic actuating device. For the purpose of adjustment, a control pressure medium can be applied to the actuating device by a control valve. An additional pressure-control device is configured to be used to set a control pressure of the control pressure medium to a setpoint value which is dependent on a drive range of the transmission or of the traction drive.

Power-split transmission for a traction drive and method for controlling the transmission

A hydraulic arrangement includes at least one pressure unit connected to a hydraulic machine that is operable as a pump and a safety device for the pressure unit. The safety device includes pressure sensors configured to detect a pressure in the pressure unit and an electronic control unit that is connected to the pressure sensors. A delivery volume pumped by the hydraulic machine is configured to be controlled via the control unit.

Hydraulic arrangement

A power split transmission, in particular an input-coupled power split transmission, includes a mechanical branch and a hydrostatic branch connected in parallel therewith. The hydrostatic branch has a closed hydraulic circuit with a first working line and a second working line with one of the working lines carrying high pressure and the other carrying low pressure. The circuit has a pressure accumulator for pressure regulation connected to the respective working line carrying high pressure. This configuration provides a power split transmission that has a hydraulic circuit in which the respective working line carrying high pressure is hydraulically smoother or more flexible by virtue of the preferably continuous connection of the pressure accumulator.

Power split transmission

The invention relates to a method for controlling a drive system () and to a drive system () having a drive machine () which is connected to a first element () of an epicyclic gearing (). The drive system () also comprises a shift gearing () which is connected to a third element () of the epicyclic gearing. Also provided is a hydrostatic machine () which is connected to a second element () of the epicyclic gearing (). The hydrostatic machine () is set to a negligible displacement volume (V) A gear stage of the shift gearing () is engaged. The displacement volume (V) of the hydrostatic machine () is increased and the hydrostatic machine () charges a hydraulic accumulator (). After moment equilibrium is reached in the epicyclic gearing (), the displacement volume (V) of the hydrostatic machine () is supplied to the epicyclic gearing (). In the event of synchronization of the epicyclic gearing (), a clutch () for blocking the epicyclic gearing () is closed. The hydraulic accumulator () is discharged further via the hydrostatic machine () and adds a torque generated by the drive machine ().

Method of controlling a drive and drive system

The invention relates to a drive () having an energy storage device and a method for storing brake energy. A drive () has an energy storage device having a hydrostatic piston engine () and a storage element () which is connected thereto. In a high-pressure storage line (), an adjustable throttle location () is arranged between the piston engine () and the storage element (). During the braking operation, the adjustable throttle location () is adjusted in accordance with a detected requested brake torque. The pressure medium is conveyed from the hydrostatic piston engine () via the adjustable throttle location () into the storage element ().

Drive having an energy storage device and method for storing kinetic energy

The invention relates to a method for controlling a hydrostatic drive having at least one first hydraulic consumer and one second hydraulic consumer. The two hydraulic consumers are driven by a common drive machine. First of all, a first power requirement of the first hydraulic consumer is determined (). Proceeding from the determined first power requirement, the free power which is available as a result of the common drive machine is determined (). This available free power of the common drive machine is scaled onto a possible actuating path of a control transmitter for the working hydraulics (). A position of the control transmitter for actuating the second hydraulic consumer is determined () and a power requirement is assigned on the basis of the scaled available free power. An operating point of the common drive machine is fixed from the first power requirement and the second power requirement ().

Method for controlling a hydrostatic drive

The invention relates to a drive () having an energy recovery function. The drive having an energy recovery function comprises a hydrostatic piston machine () and at least one storage element () which is connected to said hydrostatic piston machine. Said hydrostatic piston machine () and the at least one storage element () are connected together by means of a storage line. Said storage line is divided into a first storage line section () and into a second storage line section () by a throttle value unit (). Said throttle valve unit () comprises a control pressure valve unit () and a built-in valve (). The control pressure valve unit () produces a control pressure which acts upon the built-in valve ().

Drive having an energy recovery function having a brake pressure control valve

A hydrostatic drive in an open circuit is provided. The hydrostatic drive has a hydraulic pump and a hydraulic motor. The hydraulic pump and the hydraulic motor are connected to one another via a feed line. In addition, the hydrostatic drive has a storage element for storing pressure energy. A first valve device, which is arranged downstream of the hydraulic motor, alternately connects the downstream connection of the hydraulic motor to a tank volume or to the storage element.

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Neusaess, Germany

Matthias Mueller