Method and construction machine for conveying thick matter

Abstract

The invention relates to a method for operating a construction machine (1) for conveying thick matter (D), wherein the method comprises the steps of: a) specifying a target variable value (S) representing a volumetric flow of thick matter (D) to be conveyed by means of the thick matter pump system (2); b) feeding the target variable value (S) as an input variable into an optimisation algorithm (A) for parameter optimisation with regard to a predetermined optimisation target (Z); c) determining at least one setting combination (K), which is optimal with respect to the optimisation target (Z), of values for a first drive parameter (AP1) of a first drive system (5) of the construction machine (1) and for a second drive parameter (AP2) of a second drive system (6) of the construction machine (1) and a first pump parameter (PP1) of a first hydraulic pump (7) of the construction machine (1) and a second pump parameter (PP2) of a second hydraulic pump (8) of the construction machine (1) as output variable of the optimisation algorithm (A) by means of the optimisation algorithm (A), in such a way that when the construction machine (1) is operated with the setting combination (K), the target variable value (S) is reachable or is reached.

Description

[0001] METHOD AND CONSTRUCTION MACHINE FOR TRANSPORTING HIGH POLYMERS

[0002] FIELD OF APPLICATION AND STATE OF THE ART

[0003] The invention relates to a method for operating a construction machine for conveying thick materials. The invention also relates to such a construction machine for conveying thick materials.

[0004] TASK AND SOLUTION

[0005] It is an object of the present invention to provide a method for operating a construction machine for conveying thick material and such a construction machine for conveying thick material, which have improved properties.

[0006] This problem is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject matter of the dependent patent claims.

[0007] A method according to the invention is used to operate a construction machine for conveying thick matter. The construction machine has a hydraulically driven thick matter pumping system which is designed to convey thick matter. The construction machine also has a hydraulic system which is designed to hydraulically drive the thick matter pumping system. The hydraulic system has a first hydraulic pump and a second hydraulic pump. The first hydraulic pump is designed for variably operating with at least one variably adjustable first pump parameter. The second hydraulic pump is designed for variably operating with at least one variably adjustable second pump parameter, independent of the first pump parameter. The construction machine also has a first drive system. The first drive system is designed to drive the hydraulic system with at least one variably adjustable first drive parameter of the first drive system.The construction machine also has a second drive system. The second drive system is designed to drive the hydraulic system with at least one variably adjustable second drive parameter of the second drive system. The hydraulic system has a drive shaft to which the first drive system and the second drive system are drivingly connected, wherein—alternatively or additionally—the first drive system has an internal combustion engine and the second drive system has an electric motor. In other words, the two hydraulic pumps can be drivingly connected to the drive shaft, regardless of whether the first drive system has the internal combustion engine and the second drive system has the electric motor. In particular, this neither requires nor excludes the possibility that the first drive system can have the internal combustion engine and the second drive system can have the electric motor if the two hydraulic pumps are drivingly connected to the drive shaft.Alternatively, the first drive system can comprise the internal combustion engine and the second drive system the electric motor, regardless of whether the two hydraulic pumps are connected to the drive shaft or whether such a drive shaft is present. If the two drive systems are configured differently, in particular one with an internal combustion engine and the other with an electric motor, the two drive systems can form a hybrid drive for the construction machine.

[0008] The method according to the invention comprises a step a), according to which a target value is specified, which represents a volume flow of thick matter to be conveyed by the thick matter pumping system. The method further comprises a step b), according to which the target value is fed as an input variable into an optimization algorithm, wherein the optimization algorithm serves for parameter optimization with regard to a predetermined optimization goal. The optimization algorithm can be configured for automatic parameter optimization with respect to the optimization goal.The method further comprises a step c), according to which, using the optimization algorithm, at least one setting combination of values ​​for the first drive parameter and the second drive parameter, and the first pump parameter and the second pump parameter, which is optimal with regard to the optimization objective, is determined as the output variable of the optimization algorithm such that the target value is achievable or is reached when the construction machine is operated with the setting combination. The method can be computer-implemented.

[0009] Advantageously, the method according to the invention can be used to achieve optimized operation of the construction machine, particularly depending on the situation, in particular through separate or combined operation of the first drive system and the second drive system depending on the determined optimal setting combination. The method according to the invention can therefore advantageously enable operation of the construction machine at an optimal energy point. Additional parameters of other drive components of the construction machine can expediently be taken into account by the optimization algorithm.

[0010] The thickened material can be a building material. The building material can be concrete, especially fresh concrete. Additionally or alternatively, the building material can include or be mortar, cement, screed, and / or plaster. Furthermore, additionally or alternatively, the thickened material can be a slurry. The term "configured" can be used synonymously with the term "formed."

[0011] The terms “comprises” or “has” can be used synonymously with each other and with the term “comprises”.

[0012] In this context, “control” can mean “steer” and / or “regulate”.

[0013] The first hydraulic pump and the second hydraulic pump are expediently arranged in a hydraulic circuit of the hydraulic system. The high-density solids pump system can be coupled into the hydraulic circuit for its hydraulic drive. The first hydraulic pump and the second hydraulic pump can generate a variably adjustable total volume flow of hydraulic fluid in the hydraulic circuit for hydraulically driving the high-density solids pump system. The first drive system and the second drive system can be drive-connected to the drive shaft—particularly if present—by means of a gear unit of the construction machine. The gear unit can be a further drive component of the construction machine. The gear unit can have a further, in particular variable and / or speed-dependent, parameter, which can advantageously be taken into account by the optimization algorithm.

[0014] In one embodiment of the invention, the drive shaft can be driven jointly by the first drive system and the second drive system. Alternatively or additionally, the drive shaft can be driven independently of one another by the first drive system and the second drive system. In particular, the drive shaft can optionally be driven jointly and / or independently of one another by the first drive system and the second drive system. Accordingly, the first drive system and the second drive system can be operated separately or in combination to drive the drive shaft. The first drive system and / or the second drive system can be coupled to the drive shaft by means of a freewheel of the hydraulic system.

[0015] In a further embodiment of the invention, the optimization objective depends on a maximum overall efficiency of the first drive system and the second drive system and of the first hydraulic pump and the second hydraulic pump. The first drive system, the second drive system, the first hydraulic pump and the second hydraulic pump can be drive components of the construction machine. The overall efficiency can result from the individual efficiencies of situationally active drive components, which depend on the respective operating point. The maximum overall efficiency can also take into account a further drive component, such as in particular the gear cluster, along with the associated parameter. The efficiency of the gear cluster can be taken into account by the optimization algorithm as a parameter, in particular if the optimization objective depends on the maximum overall efficiency.Alternatively or additionally, the optimization target depends on a maximum range based on the energy reserve for the first drive system and / or the second drive system. The range can be a maximum operating time of the construction machine or a maximum volume of thick material that can be conveyed by the construction machine, particularly when the energy reserve is limited. Alternatively or additionally, the optimization target depends on the maximum service life of an energy storage device of the construction machine for the energy reserve.

[0016] In particular, if there is no common drive shaft for the drive connection of the two hydraulic pumps, the drive systems can be switched on depending on a target flow rate of building material to be pumped, in particular according to the determined setting combination.

[0017] In a further embodiment of the invention, the first drive system has at least one first drive characteristic map with the at least one first drive parameter. The second

[0018] The drive system has at least one second drive characteristic map with the at least one second drive parameter. The first hydraulic pump has at least one first

[0019] Pump characteristic map with at least one first pump parameter. The second

[0020] The hydraulic pump has at least one second pump characteristic map with the at least one second pump parameter. The optimization algorithm uses the first

[0021] Drive characteristic map and the second drive characteristic map and the first pump characteristic map and the second pump characteristic map in determining the optimal setting combination. Even if different drive systems are used which have different characteristic maps, an optimized operation of the construction machine can thus be enabled. In particular, the method can enable a flexible switching of operating strategies of the drive systems depending on the input power. The optimization algorithm can expediently access characteristic maps of other drive components such as an electrical converter of the construction machine and / or the gear unit. The characteristic maps can each indicate how at least one variable corresponding to the optimization goal changes depending on the respective at least one parameter - iein particular of the at least one first drive parameter and / or the at least one second drive parameter and / or the at least one first pump parameter and / or the at least one second pump parameter and / or at least one further parameter. In a further embodiment of the invention, the steps of the method are carried out by means of a, in particular internal or integrated, control device of the construction machine or by means of an external control device, in particular one that can be operated universally and / or independently of the construction machine. When the steps of the method are carried out by means of a, in particular internal, control device of the construction machine, the optimal setting combination can advantageously be determined during operation of the construction machine, in particular continuously, so that the target value is achieved by the setting combination.By performing the steps of the method using the external control device, the optimal setting combination can be determined without operating the construction machine, i.e., "offline." The offline determination of the optimal setting combination can have a beneficial effect on the computing power provided by the construction machine. In the present context, a control device can be a computing unit or a computer unit configured for the computer implementation of the method according to the invention.

[0022] In a further embodiment of the invention, the method includes a step in which the construction machine is operated based on the determined setting combination. In particular, either the first drive system or the second drive system is selectively activated or deactivated depending on the determined optimal setting combination and—alternatively or additionally—the target value. This does not preclude combined operation.

[0023] In a further embodiment of the invention, as a basis for step c), it is determined before the execution of step c) whether the first drive system or the second drive system, or both the first drive system and the second drive system, are active. In this respect, startup dependencies and / or characteristics of the drive systems or their drive parameters can be taken into account in the optimization algorithm.

[0024] In a further embodiment of the invention, the first drive system, in particular in addition to the internal combustion engine, has a fuel tank for supplying the internal combustion engine with fuel.

[0025] In a further embodiment of the invention, the second drive system, in particular in addition to the electric motor, has an electrical power connection for supplying the electric motor with electrical energy and—alternatively or additionally—an electrical energy storage device for supplying the electric motor with electrical energy. Alternatively or additionally, the second drive system can have a fuel cell for supplying the electric motor with electrical energy.

[0026] In a further embodiment of the invention, the first hydraulic pump is designed as a first axial piston pump. The first axial piston pump has a radially adjustable first sliding disk for variably adjusting the first pump parameter in the form of a first pivot angle of the first sliding disk. The second hydraulic pump is designed as a second axial piston pump. The second axial piston pump has a variably adjustable second sliding disk for variably adjusting the second pump parameter in the form of a second pivot angle of the second sliding disk, independent of the first pivot angle.

[0027] In a further embodiment of the invention, the at least one first drive parameter is a first drive speed of the first drive system, wherein a pump speed of the drive shaft depends on the first drive speed of the first drive system. Alternatively or additionally, the at least one second drive parameter is a second drive speed of the second drive system, wherein the pump speed of the drive shaft depends on the second drive speed of the second drive system. Alternatively or additionally, the at least one first pump parameter is the pump speed of the drive shaft and - alternatively or additionally - the first pivot angle of the first hydraulic pump. Alternatively or additionally, the at least one second pump parameter is the pump speed of the drive shaft and - alternatively or additionally - the second pivot angle of the second hydraulic pump.If the pump speed forms both a first pump parameter and a second pump parameter, preferably at least one further first pump parameter and / or at least one further second pump parameter is taken into account by the optimization algorithm in order to enable the independent operation of the hydraulic pumps.

[0028] In a further embodiment of the invention, in order to set the determined setting combination with exclusive activity of the first drive system, the first drive parameter is first brought to a minimum value, while the first pump parameter and / or the second pump parameter are adjusted. In this case, the first pump parameter and / or the second pump parameter can be adjusted until the target value is reached, in particular wherein the first drive parameter is then brought to a maximum value. Alternatively or additionally, in order to set the determined setting combination with exclusive activity of the second drive system, the second drive parameter is first brought to its value according to the determined setting combination before the first pump parameter and / or second pump parameter are adjusted, in particular until the target value is reached.

[0029] A construction machine according to the invention is used to convey thick matter. The construction machine has a hydraulically driven thick matter pump system designed to convey thick matter. The construction machine also has a hydraulic system designed to hydraulically drive the thick matter pump system. The hydraulic system comprises a first hydraulic pump and a second hydraulic pump. The first hydraulic pump is designed for variable operation with at least one variably adjustable first pump parameter. The second hydraulic pump is designed for variable operation, independent of the first pump parameter, with at least one variably adjustable second pump parameter. The construction machine also has a first drive system designed to drive the hydraulic system with at least one variably adjustable first drive parameter of the first drive system.The construction machine also has a second drive system designed to drive the hydraulic system with at least one variably adjustable second drive parameter of the second drive system. The construction machine also has an electronic control device designed to set the optimal setting combination determined by means of a method according to the invention described above. Thus, by means of the electronic control device, the first drive parameter and the second drive parameter and the first pump parameter and the second pump parameter can be set according to the optimal setting combination. In particular, the electronic control device is designed to carry out the method according to the invention.The hydraulic system has a drive shaft to which the first drive system and the second drive system are drivingly connected, wherein - alternatively or additionally - the first drive system has an internal combustion engine and the second drive system has an electric motor. In other words: the two hydraulic pumps can be drivingly connected to the drive shaft, regardless of whether the first drive system has the internal combustion engine and the second drive system has the electric motor. In particular, this neither requires nor excludes the possibility that the first drive system can have the internal combustion engine and the second drive system can have the electric motor if the two hydraulic pumps are drivingly connected to the drive shaft. Alternatively, the first drive system can have the internal combustion engine and the second drive system can have the electric motor, regardless of whether the two hydraulic pumps are drivingly connected to the drive shaft.whether such a common drive shaft is present. If the two drive systems are designed differently, especially one with an internal combustion engine and the other with an electric motor, the two drive systems can form a hybrid drive for the construction machine.

[0030] BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Further advantages and features of the invention will become apparent from the claims and the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings. Like reference numerals refer to like, similar, or functionally identical components.

[0032] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0033] Fig. 1 shows a rough schematic structure of an embodiment of a construction machine according to the invention for conveying thick material during the implementation of a method according to the invention for operating the construction machine,

[0034] Fig. 2 is a block diagram of an embodiment of the method for operating the construction machine according to Fig. 1,

[0035] Fig. 3 shows a schematic perspective view of the construction machine according to Fig. 1.

[0036] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] A construction machine 1 according to the invention is intended for conveying thick matter D. The construction machine 1 has a hydraulically driven thick matter pumping system 2. The thick matter pumping system 2 is designed for conveying thick matter D. The construction machine 1 also has a hydraulic system 3. The hydraulic system 3 is designed for the hydraulic drive of the thick matter pumping system 2. The hydraulic system 3 has, for example, a drive shaft 4, a first hydraulic pump 7, and a second hydraulic pump 8. In this case, the first hydraulic pump 7 and the second hydraulic pump 8 are drive-connected to the drive shaft 4. The first hydraulic pump 7 is designed for variable operation with at least one variably adjustable first pump parameter PP1. The second hydraulic pump 8 is designed for variable operation independent of the first pump parameter PP1 with at least one variably adjustable second pump parameter PP2.

[0038] The construction machine 1 also has a first drive system 5, which is designed to drive the drive shaft 4 of the hydraulic system 3 with at least one variably adjustable first drive parameter AP1 of the first drive system 5. Furthermore, the construction machine 1 has a second drive system 6, which is designed to drive the drive shaft 4 of the hydraulic system 3 with at least one variably adjustable second drive parameter AP2 of the second drive system 6.

[0039] According to a step a) of the method, in particular by user input, a target value S is specified, which represents a volume flow of thick matter D to be pumped by means of the thick matter pumping system 2. According to a step b) of the method, the target value S is fed as an input variable to an optimization algorithm A for parameter optimization with regard to a predetermined optimization target Z. According to a step c) of the method, at least one setting combination K of values ​​for the first drive parameter AP1 and the second drive parameter AP2 and the first pump parameter PP1 and the second pump parameter PP2 that is optimal with regard to the optimization target Z is determined as an output variable of the optimization algorithm A by means of the optimization algorithm A. The setting combination K is determined in such a way that when the construction machine 1 is operated with the setting combination K, the target value S can be achieved or is achieved.

[0040] In the present case, the first hydraulic pump 7 and the second hydraulic pump 8 are arranged in a hydraulic circuit HK of the hydraulic system 3. The thick matter pumping system 2 is coupled into the hydraulic circuit HK for its hydraulic drive. The first hydraulic pump 7 and the second hydraulic pump 8 can generate a variably adjustable total volume flow Q of hydraulic fluid H in the hydraulic circuit KH for hydraulically driving the thick matter pumping system 2. The first drive system 5 and the second drive system 6 are drivingly connected to the drive shaft 4, for example by means of a gear set G. The first drive system 5 and - alternatively or additionally - the second drive system 6 can be coupled to the drive shaft 4 by means of a freewheel of the hydraulic system 3. For example, the drive shaft 6 can be driven jointly by means of the first drive system 5 and the second drive system 6.Alternatively or additionally, the drive shaft 4 can be driven independently of each other by means of the first drive system 5 and the second drive system 6. For example, the drive shaft 4 can be selectively driven jointly or independently of each other by means of the first drive system 5 and the second drive system 6.

[0041] For example, the optimization objective Z depends on a maximum overall efficiency of the first drive system 5 and the second drive system 6 and the first hydraulic pump 7 and the second hydraulic pump 8. The maximum overall efficiency can also be an efficiency of another drive component of the construction machine 1. Such another drive component can be the gear set G.

[0042] Alternatively or additionally, the optimization target Z depends on a maximum range based on an energy reserve for the first drive system 5 and - alternatively or additionally - for the second drive system 6.

[0043] Alternatively or additionally, the optimization objective Z depends on a maximum service life of an energy storage device 9 of the construction machine 1 for the energy supply.

[0044] The optimization objective Z can be maximum overall efficiency. The optimization objective Z can be maximum range. The optimization objective Z can be maximum service life.

[0045] For example, the first drive system 5 has at least a first drive characteristic map AK1 with the at least one first drive parameter AP1. The second drive system 6 has, for example, a second drive characteristic map AK2 with the at least one second drive parameter AP2. For example, the first hydraulic pump 7 has at least a first pump characteristic map PK1 with the at least one first pump parameter PP1. For example, the second hydraulic pump 8 has at least a second pump characteristic map PK2 with the at least one second pump parameter PP2. In this case, the optimization algorithm A accesses the first drive characteristic map AK1 and the second drive characteristic map AK2 and the first pump characteristic map PK1 and the second pump characteristic map PK2 during the determination according to step c). The optimization algorithm A can also access further characteristic maps of other drive components.

[0046] In the present case, the steps of the method are carried out by means of a control device 10 of the construction machine 1. Alternatively, the steps of the method can be carried out by means of an external control device, i.e., a separate control device from the construction machine 1. The electronic control device 10 of the construction machine 1 is configured in the present case to set the optimal setting combination K determined by means of the method.

[0047] For example, the method comprises a step according to which the construction machine 1 is operated based on the determined setting combination K. In this case, either the first drive system 5 or the second drive system 6 can be selectively activated or deactivated depending on the setting combination K and - alternatively or additionally - the target value S. Combined operation of the first drive system 5 and the second drive system 6 depending on the setting combination K and / or the target value S is also possible. For example, the method comprises a step C according to which it is determined whether the first drive system 5 or the second drive system 6 or both the first drive system 5 and the second drive system 6 are active.

[0048] In the present case, the first drive system 5 has an internal combustion engine 11 and a fuel tank 12 for supplying the internal combustion engine 11 with fuel F. The second drive system 6 in the present case has an electric motor 13. A converter of the construction machine 1 for the electric motor 13 can form a further drive component of the construction machine 1 to be taken into account by the optimization algorithm A. In addition, the second drive system 6 in the present case comprises an electrical mains connection 14 for supplying the electric motor 13 with electrical energy E and an electrical energy storage device 9, 15 for supplying the electric motor 13 with electrical energy E. Alternatively or additionally, the second drive system 6 can have a fuel cell for supplying the electric motor 13 with electrical energy E.

[0049] The first hydraulic pump 7 is embodied in the form of a first axial piston pump 16. The first axial piston pump 16 has a variably adjustable first sliding disk 17 for variably setting the first pump parameter PP1 in the form of a first pivot angle W1 of the first sliding disk 17. The second hydraulic pump 8 is embodied in the form of a second axial piston pump 18. The second axial piston pump 18 has a variably adjustable second sliding disk 19 for variably setting the second pump parameter PP2 in the form of a second pivot angle W2 of the second sliding disk 19, independent of the first pivot angle W1.

[0050] The at least one first drive parameter AP1 is, for example, a first drive speed N1 of the first drive system 5. A pump speed NP of the drive shaft 4 depends on the first drive speed N1 of the first drive system 5. Alternatively or additionally, the at least one second drive parameter AP2 is a second drive speed N2 of the second drive system 6. The pump speed NP of the drive shaft 4 depends on the second drive speed N2 of the second drive system 6. Alternatively or additionally, the at least one first pump parameter PP1 is the pump speed NP of the drive shaft 4. In this case, a further first pump parameter PP1 is the first pivot angle W1 of the first hydraulic pump 7. Alternatively or additionally, the at least one second pump parameter PP2 is the pump speed NP of the drive shaft 4. In this case, a further second pump parameter PP1 is the second pivot angle W2 of the second hydraulic pump 8.

[0051] For example, to set the determined setting combination K when only the first drive system 5—in this case, the internal combustion engine 11—is active, the first drive parameter AP1 is first set to a minimum value, while the first pump parameter PP1 and / or the second pump parameter PP2 are adjusted. The first drive parameter AP1 can be kept at its minimum value until the target value S is reached. Once the target value S is reached, the first drive parameter AP1 can then be set to its maximum value.

[0052] Alternatively or additionally, to set the determined setting combination K when only the second drive system 6—in this case, the electric motor 13—is active, the second drive parameter AP2 is first adjusted to its value according to the determined setting combination K before the first pump parameter PP1 and / or the second pump parameter PP2 are adjusted. In particular, the first pump parameter PP1 and—alternatively or additionally—the second pump parameter PP2 are adjusted until the setpoint value S is reached.

[0053] The characteristic maps AK1, AK2, PK1, PK2 can be stored in a machine control system, i.e. in the control device 10 of the construction machine 1. If not already known to the machine control system, the machine control system can additionally receive one or more signals that provide feedback about the drive components of the construction machine 1 that are currently in use. From this information and the characteristic maps AK1, AK2, PK1, PK2, an optimal control strategy - i.e. the optimal setting combination K - can be calculated online during the operation of the construction machine 1 using the optimization algorithm A. The resulting control variables such as speeds N1, N2, NP and swivel angles W1, W2 can be specified for the respective drive components so that optimized operation can be achieved based on them. Alternatively or additionally, the characteristic maps AK1, AK2, PK1, PK2 of the drive components can be imported into an external optimization tool, i.e.into the external control device in order to derive, i.e., determine, a strategy for various drive train configurations from the characteristic maps AK1, AK2, PK1, PK2. Using the feedback regarding which drive components are currently being used, the appropriate strategy can then be selected and used in the operation of construction machine 1. This eliminates the need for computationally intensive execution of the optimization algorithm during operation of the construction machine, i.e., online.

[0054] In alternative embodiments not shown, the common drive shaft 4 can be omitted, wherein the first drive system 5 is implemented with an internal combustion engine 11 and the second drive system 6 with an electric motor 13. The first drive system 5 can be designed to drive the first hydraulic pump 7 and the second drive system 6 can be designed to drive the second hydraulic pump 8, in particular with only a hydraulic connection between the hydraulic pumps 7, 8 via the hydraulic circuit HK. The drive systems 5, 6 can be activated depending on a target delivery rate of building material to be conveyed, in particular according to the setting combination determined according to the method.

Claims

Patent claims 1. A method for operating a construction machine (1) for conveying thick matter (D), wherein the construction machine (1) comprises: a hydraulically driven thick matter pumping system (2), wherein the thick matter pumping system (2) is designed to convey thick matter (D), a hydraulic system (3), wherein the hydraulic system (3) is designed to hydraulically drive the thick matter pumping system (2) and has a first hydraulic pump (7) and a second hydraulic pump (8), wherein the first hydraulic pump (7) is designed for variable operation with at least one variably adjustable first pump parameter (PP1), and wherein the second hydraulic pump (8) is designed for variable operation independent of the first pump parameter (PP1) with at least one variably adjustable second pump parameter (PP2), a first drive system (5),wherein the first drive system (5) is designed to drive the hydraulic system (3) with at least one variably adjustable first drive parameter (AP1) of the first drive system (5), and a second drive system (6), wherein the second drive system (6) is designed to drive the hydraulic system (3) with at least one variably adjustable second drive parameter (AP2) of the second drive system (6), wherein the hydraulic system (3) has a drive shaft (4) to which the first hydraulic pump (7) and the second hydraulic pump (8) are drivingly connected, and / or wherein the first drive system (5) has an internal combustion engine (11) and the second drive system (6) has an electric motor (13),wherein the method comprises the steps of: a) specifying a target value (S) representing a volume flow of thick matter (D) to be conveyed by the thick matter pumping system (2); b) supplying the target value (S) as an input variable to an optimization algorithm (A) for parameter optimization with regard to a predetermined optimization target (Z); c) determining at least one setting combination (K) of values ​​for the first drive parameter (AP1) and the second drive parameter (AP2) and the first pump parameter (PP1) and the second pump parameter (PP2) that is optimal with regard to the optimization target (Z) as an output variable of the optimization algorithm (A) by means of the optimization algorithm (A), such that when the construction machine (1) is operated with the setting combination (K), the target value (S) is achievable or is achieved.

2. Method according to the preceding claim, wherein the drive shaft (4) can be driven jointly and / or independently of one another, in particular selectively, by means of the first drive system (5) and the second drive system (6).

3. Method according to one of the preceding claims, wherein the optimization target (Z) is dependent on: a maximum overall efficiency of the first drive system (5) and the second drive system (6) and the first hydraulic pump (7) and the second hydraulic pump (8), and / or a maximum range based on an energy reserve for the first drive system (5) and / or for the second drive system (6), and / or a maximum service life of an energy store (9, 15) of the construction machine (1) for the energy reserve.

4. Method according to one of the preceding claims, wherein the first drive system (5) has at least a first drive characteristic map (AK1) with the at least one first drive parameter (AP1), wherein the second drive system (6) has at least a second drive characteristic map (AK2) with the at least one second drive parameter (AP2), wherein the first hydraulic pump (7) has at least a first pump characteristic map (PK1) with the at least one first pump parameter (PP1), wherein the second hydraulic pump (8) has at least a second pump characteristic map (PK2) with the at least one second pump parameter (PP2), wherein the optimization algorithm (A) accesses the first drive characteristic map (AK1) and the second drive characteristic map (AK2) and the first pump characteristic map (PK1) and the second pump characteristic map (PK2) during the determination.

5. Method according to one of the preceding claims, wherein the steps of the method are carried out by means of a control device (10) of the construction machine (1) or by means of an external control device.

6. A method according to any one of the preceding claims, wherein the method comprises the step: Operating the construction machine (1) based on the determined setting combination (K), in particular wherein either the first drive system (5) or the second drive system (6) are selectively activated or deactivated depending on the setting combination (K) and / or the target value (S).

7. Method according to one of the preceding claims, wherein as a basis for step c) it is determined temporally before the execution of step c) whether the first drive system (5) or the second drive system (6) or both the first drive system (5) and the second drive system (6) are active.

8. Method according to one of the preceding claims, wherein the first drive system (5), in particular in addition to the internal combustion engine (11) of the first drive system (5), has a fuel tank (12) for supplying the internal combustion engine (11) with fuel (F).

9. Method according to one of the preceding claims, wherein the second drive system (6), in particular in addition to the electric motor (13) of the second drive system (6), has an electrical mains connection (14) for supplying the electric motor (13) with electrical energy (E) and / or an electrical energy store (15) for supplying the electric motor (13) with electrical energy (E) and / or a fuel cell for supplying the electric motor (13) with electrical energy (E).

10. Method according to one of the preceding claims, wherein the first hydraulic pump (7) is designed in the form of a first axial piston pump (16) having a variably adjustable first sliding disk (17) for variably setting the first pump parameter (PP1) in the form of a first pivot angle (W1) of the first sliding disk (17) and the second hydraulic pump (8) is designed in the form of a second axial piston pump (18) having a variably adjustable second sliding disk (19) for variably setting the second pump parameter (PP2) in the form of a second pivot angle (W2) of the second sliding disk (19) independently of the first pivot angle (W1).

11. Method according to one of the preceding claims, wherein the at least one first drive parameter (AP1) is a first drive speed (N1) of the first drive system (5), wherein a pump speed (NP) of the drive shaft (4) depends on the first drive speed (N1) of the first drive system (5); and / or wherein the at least one second drive parameter (AP2) is a second drive speed (N2) of the second drive system (6), wherein a pump speed (NP) of the drive shaft (4) depends on the second drive speed (N2) of the second drive system (6); and / or wherein the at least one first pump parameter (PP1) is a pump speed (NP) of the drive shaft (4) and / or a first pivot angle (W1) of the first hydraulic pump (7); and / or wherein the at least one second pump parameter (PP2) is a pump speed (NP) of the drive shaft (4) and / or a second pivot angle (W2) of the second hydraulic pump (8).

12. Method according to one of the preceding claims, wherein, in order to set the determined setting combination (K) with exclusive activity of the first drive system (5), the first drive parameter (AP1) is first brought to a minimum value, while the first pump parameter (PP1) and / or the second pump parameter (PP2) are adjusted, in particular in order to achieve the target value (S), in particular wherein the first drive parameter (AP1) is then brought to a maximum value; and / or wherein, in order to set the determined setting combination (K) with exclusive activity of the second drive system (6), the second drive parameter (AP2) is first brought to its value according to the determined setting combination (K), before the first pump parameter (PP1) and / or the second pump parameter (PP2) are adjusted, in particular in order to achieve the target value (S).

13. Construction machine (1) for conveying thick matter (D), wherein the construction machine (1) comprises: a hydraulically driven thick matter pumping system (2), wherein the thick matter pumping system (2) is designed to convey thick matter (D), a hydraulic system (3), wherein the hydraulic system (3) is designed to hydraulically drive the thick matter pumping system (2) and has a first hydraulic pump (7) and a second hydraulic pump (8), wherein the first hydraulic pump (7) is designed for variable operation with at least one variably adjustable first pump parameter (PP1), and wherein the second hydraulic pump (8) is designed for variable operation independent of the first pump parameter (PP1) with at least one variably adjustable second pump parameter (PP2), a first drive system (5), wherein the first drive system (5) is designed to drive the hydraulic system (3) with at least one variably adjustable first drive parameter (AP1) of the first drive system (5), and a second drive system (6), wherein the second drive system (6) is designed to drive the hydraulic system (3) with at least one variably adjustable second drive parameter (AP2) of the second drive system (6), wherein the hydraulic system (3) has a drive shaft (4) to which the first hydraulic pump (7) and the second hydraulic pump (8) are drivingly connected, and / or wherein the first drive system (5) has an internal combustion engine (11) and the second drive system (6) has an electric motor (13), wherein the construction machine (1) has an electronic control device (10) which is designed to set the optimal setting combination determined by means of a method according to one of the preceding claims.

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