Abstract: A method is for producing, for a hydraulic machine having an actuator, a setpoint-value trajectory satisfying predefined limitations in order to influence an output variable of the hydraulic machine. A trajectory of unlimited setpoint values is fed to a trajectory planning function, which produces the setpoint-value trajectory from the trajectory of unlimited setpoint values. In the trajectory planning function, the trajectory of unlimited setpoint values is differentiated at least twice in order to obtain a trajectory of unlimited setpoint values that is differentiated n times. In the trajectory planning function, at least one limitation is applied to the differentiated trajectory of unlimited setpoint values in order to obtain a differentiated trajectory of limited setpoint values. The differentiated trajectory of limited setpoint values is fed to a filter integrator chain in order to obtain the setpoint-value trajectory.

Abstract: A hydrostatic axial piston pump has adjustable swept volume and is configured for fluidic connection to a hydraulic motor of a hydrostatic propulsion drive in a hydraulic circuit. The hydrostatic axial piston pump includes an adjusting unit configured to adjust the swept volume. The adjusting unit has an actuating cylinder with a first actuating pressure chamber, in which a first actuating pressure can be set via a first pressure reducing valve. The first actuating pressure is dependent on a first current at a first electromagnet of the first pressure reducing valve. An electronic control device is configured to store a model of the first current in a manner which is dependent on a requested speed.

Abstract: 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.

Abstract: 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.

Abstract: A control structure for a mobile work machine includes at least one output converter, at least one output provider, and a control unit. The at least one output converter is operatively connected to the at least one output provider by way of a shaft, and the control unit determines kinetic energy of the shaft, so as to utilize the shaft as an energy accumulator.

Abstract: A hydrostatic traction drive for a mobile working machine includes a first hydraulic machine coupled to a drive machine, a second hydraulic machine arranged with the first hydraulic machine in a hydraulic circuit and coupled to an output, and an electronic control device. A characteristic diagram of a setpoint driving behavior of the mobile working machine is stored in the electronic control device and is parameterized at least in accordance with at least one driving request.

Abstract: The invention relates to a method for generating a control variable trajectory for an actuator so as to influence an input variable of a system, wherein a set point is supplied to the output variable of the system of a trajectory planning procedure, which from the set point generates a trajectory of constrained input values for a filter integrator chain and a trajectory of flat desired states, wherein the trajectory of constrained input values and the trajectory of flat desired states are supplied to a flatness-based feedforward control procedure that generates therefrom the control variable trajectory for the actuator, wherein in the trajectory planning procedure so as to generate the trajectory of constrained input values at least one constraint is applied in dependence upon the trajectory of flat desired states.

Abstract: 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.

Abstract: A drive control arrangement, for driving of consumers of a mobile working machine with a Diesel engine, includes a Diesel engine controller, vehicle controller, and interface. The engine controller is configured to actuate the Diesel engine via a first control signal. The vehicle controller is configured to (i) control the consumers via at least one second control signal, (ii) transfer a power demand, via the interface, to the engine controller, and (iii) receive feedback, via the interface, with reference to an available power from the Diesel engine. The interface is configured such that the power demand includes a value for a mechanical power and at least one speed interval value. When the engine is delivering a power according to the value of the power demand and/or with reference to the feedback, the engine controller is further configured to control a speed of the engine in a speed interval with reference to the at least one speed interval value.

Abstract: A hydrostatic axial piston pump has adjustable swept volume and is configured for fluidic connection to a hydraulic motor of a hydrostatic propulsion drive in a hydraulic circuit. The hydrostatic axial piston pump includes an adjusting unit configured to adjust the swept volume. The adjusting unit has an actuating cylinder with a first actuating pressure chamber, in which a first actuating pressure can be set via a first pressure reducing valve. The first actuating pressure is dependent on a first current at a first electromagnet of the first pressure reducing valve. An electronic control device is configured to store a model of the first current in a manner which is dependent on a requested speed.

Abstract: A hydrostatic propulsion drive for a vehicle is disclosed including an electronic control unit and a hydrostatic transmission having a hydraulic pump with an adjustable swept volume and a hydraulic motor with an adjustable swept volume, the hydraulic pump being arranged in a closed hydraulic circuit. The swept volumes of the hydraulic pump and the hydraulic motor are changeable in accordance with a correction factor which is stored in a characteristic diagram and is dependent on the rotational speed and the drive torque of the hydraulic motor, the operating pressure at the hydraulic motor being increased if the correction factor is used. Due to the increased operating pressure, flow-induced pressure drops are reduced by way of volumetric flows, and leakage flows via gaps between moving parts of the hydraulic pump and the hydraulic motor are kept large enough to avoid excessive friction and loss of efficiency.

Abstract: A hydrostatic traction drive for a mobile working machine includes a first hydraulic machine coupled to a drive machine, a second hydraulic machine arranged with the first hydraulic machine in a hydraulic circuit and coupled to an output, and an electronic control device. A characteristic diagram of a setpoint driving behavior of the mobile working machine is stored in the electronic control device and is parameterized at least in accordance with at least one driving request.

Abstract: 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.

Abstract: A control structure for a mobile work machine includes at least one output converter, at least one output provider, and a control unit. The at least one output converter is operatively connected to the at least one output provider by way of a shaft, and the control unit determines kinetic energy of the shaft, so as to utilize the shaft as an energy accumulator.

Abstract: A hydrostatic traction drive for a vehicle with a hydrostat includes a hydraulic pump, a hydraulic motor, and an electronic control unit. The hydraulic pump has an adjustable stroke volume, and includes an adjustment device configured to adjust the adjustable stroke volume. The hydraulic motor is arranged with the hydraulic pump in a hydraulic circuit, in particular a closed hydraulic circuit. The electronic control unit is configured to exclusively control the hydrostat so that the traction drive is controllable without knowledge or control of specific components thereof. The electronic control unit has a defined interface configured to pass a target value for an operating parameter of the hydrostat to the electronic control unit.

Abstract: A drive control arrangement, for driving of consumers of a mobile working machine with a Diesel engine, includes a Diesel engine controller, vehicle controller, and interface. The engine controller is configured to actuate the Diesel engine via a first control signal. The vehicle controller is configured to (i) control the consumers via at least one second control signal, (ii) transfer a power demand, via the interface, to the engine controller, and (iii) receive feedback, via the interface, with reference to an available power from the Diesel engine. The interface is configured such that the power demand includes a value for a mechanical power and at least one speed interval value. When the engine is delivering a power according to the value of the power demand and/or with reference to the feedback, the engine controller is further configured to control a speed of the engine in a speed interval with reference to the at least one speed interval value.

Abstract: A hydrostatic axial piston pump for a hydrostatic traction drive has an adjusting unit for adjusting the stroke volume. The adjusting unit has an actuating cylinder with two counteracting actuating pressure chambers. An actuating pressure can be set in each actuating pressure chamber via a separate pressure reducing valve, the said actuating pressure depending on and preferably being proportional to a current intensity on a respective solenoid of the respective pressure reducing valve. The two current intensities can be calculated via an electronic control unit on a model basis as a function of a speed and of an operating pressure of the axial piston pump and as a function of an operating element for a driver's request, e.g. an accelerator pedal.

Abstract: 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.

Abstract: The invention relates to a method for generating a control variable trajectory for an actuator so as to influence an input variable of a system, wherein a set point is supplied to the output variable of the system of a trajectory planning procedure, which from the set point generates a trajectory of constrained input values for a filter integrator chain and a trajectory of flat desired states, wherein the trajectory of constrained input values and the trajectory of flat desired states are supplied to a flatness-based feedforward control procedure that generates therefrom the control variable trajectory for the actuator, wherein in the trajectory planning procedure so as to generate the trajectory of constrained input values at least one constraint is applied in dependence upon the trajectory of flat desired states.

Abstract: A hydrostatic transmission for a traction drive includes a first hydraulic machine that is coupled to a drive machine and that has an adjustable displacement volume and a second hydraulic machine that is fluidically connected to the first hydraulic machine and that is coupled to a drive output of the traction drive. At the first hydraulic machine, a control pressure acts in the direction of an enlargement of its displacement volume and a working pressure of the second hydraulic machine acts in the opposite direction. The hydrostatic transmission further includes a control device that varies the control pressure to influence a torque of the second hydraulic machine. The control device stores a characteristic map by which a setpoint control pressure is determined as a function of a setpoint torque and a displacement volume of the second hydraulic machine so as to regulate the torque of the second hydraulic machine.