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In a method and device for controlling a hydraulic drive system, in particular in a crane or construction machine, a closed hydraulic circuit has a hydraulic pump and motor in which depending upon a desired value (ndes) of an output parameter of the hydraulic circuit, an actuating signal (I) is gene

In a method and device for controlling a hydraulic drive system, in particular in a crane or construction machine, a closed hydraulic circuit has a hydraulic pump and motor in which depending upon a desired value (ndes) of an output parameter of the hydraulic circuit, an actuating signal (I) is generated for adjusting the hydraulic pump and/or motor. The actuating signal (I) is limited and/or reduced by a superordinate control module (6) depending on matching of a specified power value (P+; P−) with a current power value (PPu; PM) of the hydraulic pump and/or motor.

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1. A method for controlling a hydraulic drive system, which comprises a closed hydraulic circuit with a hydraulic pump and a hydraulic motor, comprising: providing by a control circuit in dependence on a desired speed of the hydraulic motor (ndes) an actuating signal (I) for adjusting at least one o

1. A method for controlling a hydraulic drive system, which comprises a closed hydraulic circuit with a hydraulic pump and a hydraulic motor, comprising: providing by a control circuit in dependence on a desired speed of the hydraulic motor (ndes) an actuating signal (I) for adjusting at least one of the hydraulic pump and the hydraulic motor; andat least one of limiting and reducing by a superordinate control module (6) the actuating signal (I) in dependence on a matching of a specified power value of the hydraulic pump (P+) with a current power value of the hydraulic pump (PPu) and a specified power value of the hydraulic motor (P−) with a current power value of the hydraulic motor(PM),wherein the specified power value of the hydraulic pump is a maximum specified output power of the hydraulic pump, the current power value of the hydraulic pump is a current output power supplied by the hydraulic pump, the specified power value of the hydraulic motor is a maximum specified output power of the hydraulic motor recirculated to the hydraulic pump, and the current power value of the hydraulic motor is a current output power of the hydraulic motor recirculated to the hydraulic pump, such that the power provided by the hydraulic pump does not exceed the maximum specified output power of the hydraulic pump and that a braking torque provided by the hydraulic motor is less than the maximum specified output power of the hydraulic motor, andwherein the actuating signal (I) is at least one of limited and reduced on the one hand in dependence on a matching of a current pump power value (PPu) with a specified maximum power value for the power to be provided and on the other hand in dependence on a matching of a current motor power value (PM) with a specified maximum power value for the power to be recirculated. 2. The method as claimed in claim 1, wherein the specified power value (P+; P−) and the current power value (PPu; PM) are supplied to a controller (9; 10) which provides a superordinate control signal (7; 8), in dependence on which the actuating signal (I) is at least one of reduced and limited. 3. The method as claimed in claim 1, wherein the specified power value (P+; P−) is determined in dependence on at least one of an operating mode and an operating situation. 4. The method as claimed in claim 1, wherein the specified power value (P+; P−) is determined in dependence on a maximum available power of at least one of the drive system and of a drive unit driving the hydraulic circuit. 5. The method as claimed in claim 1, wherein the specified power value (P+; P−) is determined in dependence on a power balance of all drive groups connected in the drive system. 6. The method as claimed in claim 1, wherein the specified power value (P+; P−) is determined in dependence on a current speed (nPu; nM) of at least one of the hydraulic pump and the hydraulic motor and on a pressure limit value of the hydraulic circuit. 7. The method as claimed in claim 1, wherein the actuating signal (I) is provided in dependence on the signal of a controller (5) to which the desired speed of the hydraulic motor and the actual speed of the hydraulic motor (ndes, nM) are supplied. 8. The method as claimed in claim 1, wherein the actuating signal (I) is provided in dependence on a pilot control signal which is determined in dependence on the desired speed of the hydraulic motor (ndes) of said output parameter and on an actual speed of at least one of the hydraulic pump and the hydraulic motor (nPu; nM). 9. The method as claimed in claim 1, wherein the actuating signal (I) first is provided dimensionless, then is at least one of limited and reduced in dependence on the matching of the specified power value (P+; P−) with the respective current power value (PPu; PM), and then is supplied to the respective actuator of the closed hydraulic circuit by a driving stage (11). 10. The method as claimed in claim 9, wherein the driving stage (11) provides an actuating signal (IM) for the hydraulic motor and an actuating signal (IPu) for the hydraulic pump. 11. A control device for controlling a hydraulic drive system, which comprises a closed hydraulic circuit with a hydraulic pump and a hydraulic motor, comprising a control signal circuit (1) for providing an actuating signal for adjusting at least one of the hydraulic pump and the hydraulic motor in dependence on a desired speed of the hydraulic motor, and comprising a superordinate control circuit (6, 9, 10) for at least one of limiting and reducing the actuating signal in dependence on a matching of a specified power value of the hydraulic pump (P+) with a current power value of the hydraulic pump (PPu) and a specified power value of the hydraulic motor (P−) with a current power value of the hydraulic motor (PM), wherein the specified power value of the hydraulic pump is a maximum specified output power of the hydraulic pump, the current power value of the hydraulic pump is a current output power supplied by the hydraulic pump, the specified power value of the hydraulic motor is a maximum specified output power of the hydraulic motor recirculated to the hydraulic pump, and the current power value of the hydraulic motor is a current output power of the hydraulic motor recirculated to the hydraulic pump, such that the power provided by the hydraulic pump does not exceed the maximum specified output power of the hydraulic pump and that a braking torque provided by the hydraulic motor is less than the maximum specified output power of the hydraulic motor, andwherein the actuating signal is at least one of limited and reduced on the one hand in dependence on a matching of a current pump power value (PPu) with a specified maximum power value for the power to be provided and on the other hand in dependence on a matching of a current motor power value (PM) with a specified maximum power value for the power to be recirculated. 12. A construction machine with a hydraulic drive system which comprises a closed hydraulic circuit with a hydraulic pump and a hydraulic motor, as well as a control device (2) for controlling the hydraulic drive system, the control device having an actuating signal circuit (1) for providing an actuating signal for adjusting at least one of the hydraulic pump and the hydraulic motor in dependence on a desired speed of the hydraulic motor, and comprising a superordinate control circuit (6, 9, 10) for at least one of limiting and reducing the actuating signal in dependence on a matching of a specified power value of the hydraulic pump (P+) with a current power value of the hydraulic pump (PPu) and a specified power value of the hydraulic motor (P−) with a current power value of the hydraulic motor (PM), wherein the specified power value of the hydraulic pump is a maximum specified output power of the hydraulic pump, the current power value of the hydraulic pump is a current output power supplied by the hydraulic pump, the specified power value of the hydraulic motor is a maximum specified output power of the hydraulic motor recirculated to the hydraulic pump, and the current power value of the hydraulic motor is a current output power of the hydraulic motor recirculated to the hydraulic pump, such that the power provided by the hydraulic pump does not exceed the maximum specified output power of the hydraulic pump and that a braking torque provided by the hydraulic motor is less than the maximum specified output power of the hydraulic motor, andwherein the actuating signal is at least one of limited and reduced on the one hand in dependence on a matching of a current pump power value (PPu) with a specified maximum power value for the power to be provided and on the other hand in dependence on a matching of a current motor power value (PM) with a specified maximum power value for the power to be recirculated. 13. The method as claimed in claim 2, wherein the specified power value (P+; P−) is determined in dependence on at least one of an operating mode and an operating situation. 14. The method as claimed in claim 13, wherein the specified power value (P+; P−) is determined in dependence on a maximum available power of at least one of the drive system and of a drive unit driving the hydraulic circuit. 15. The method as claimed in claim 14, wherein the specified power value (P+; P−) is determined in dependence on a power balance of all drive groups connected in the drive system. 16. The method as claimed in claim 15, wherein the specified power value (P+; P−) is determined in dependence on a current speed (nPu; nM) of at least one of the hydraulic pump and the hydraulic motor and on a pressure limit value of the hydraulic circuit. 17. The method as claimed in claim 1, wherein the hydraulic drive system is included in a crane or a construction machine. 18. The method as claimed in claim 11, wherein the hydraulic drive system is included in a crane or a construction machine.