Method and system

Abstract

The invention relates to a method for predicting a quantity of viscous material (D) which can be conveyed, wherein the quantity can be conveyed by means of a machine (1) which can be electrically driven. The method has the following steps: a) ascertaining the energy requirement (EB) which is required by the electrically driven machine (1) to convey a given unit of quantity of viscous material (D), b) ascertaining the supply of energy (EV) which is available to drive the electrically driven machine (1), and c) comparing the energy requirement (EB) per given unit of quantity with the supply of energy (EV) in order to estimate the quantity of viscous material (D) which can be conveyed.

Description

[0001] Procedure and system

[0002] The invention relates to a method for predicting a conveyable quantity of slurry, wherein the conveyable quantity can be conveyed by means of an electrically driven machine. The invention also relates to a system for implementing such a method.

[0003] To convey thick material on a construction site, machines are traditionally used that are powered by an internal combustion engine and a fuel tank. The internal combustion engine is supplied with fuel from the fuel tank. The amount of thick material that can be conveyed by the machine depends on the fuel level in the fuel tank. If an electrically driven machine is used to convey thick material instead of a machine with an internal combustion engine, the fuel tank is eliminated, and thus the option of displaying the fuel level is also eliminated.

[0004] It is an object of the invention to provide a method for predicting a quantity of thick material that can be conveyed by means of an electrically driven machine and a system with such an electrically driven machine, which enable a particularly reliable conveying operation for conveying thick material.

[0005] A method according to the invention serves to predict a conveyable quantity of thick material. The conveyable quantity can be conveyed by means of an electrically driven machine. The terms "drivable" and "driven" are used synonymously in the present context - unless stated otherwise. The method comprises a step a). According to step a), an energy requirement that the electrically driven machine requires to convey a predetermined unit quantity of thick material is determined. The method also comprises a step b). According to step b), an energy reserve that is available to drive the electrically driven machine is determined. Furthermore, the method comprises a step c). According to step c), the energy requirement per predetermined unit quantity is compared with the energy reserve in order to estimate the conveyable quantity of thick material.This estimation advantageously prevents the available energy supply from running out during operation of the electrically driven machine before a desired amount of thick material has been required. In the worst case, if the desired amount of thick material cannot be completely conveyed, a residue of thick material may remain in the electrically driven machine without counteracting measures. This residue can then harden, which can lead to impairment or even total failure of the electrically driven machine. This can advantageously be avoided by means of the method according to the invention. In this way, a particularly reliable conveying operation for conveying thick material is enabled.

[0006] In an embodiment of the invention, steps a), b) and / or c) are carried out before thick material is conveyed by means of the electrically driven machine. In particular, steps a), b) and / or c) are carried out using a parameterizable digital model of the electrically driven machine. In this way, it can be ensured even before conveying operation begins that the electrically driven machine is not brought into a situation in which the energy reserve could be too small for a desired conveying quantity. Alternatively or additionally, steps a), b) and / or c) are carried out while thick material is being conveyed by means of the electrically driven machine. Steps a), b) and / or c) can be carried out in continuous repetition during the conveying of the thick material.In particular, steps a), b), and / or c) are carried out during the slurry extraction process in such a way that the (still) extractable quantity of slurry estimated according to step c) is continuously updated. This allows for timely intervention during extraction if premature depletion of the energy supply is imminent. This proves particularly advantageous when energy requirements change. The energy requirements can change if the geodetic pumping head to be overcome during slurry extraction and / or the construction material consistency and / or the extraction rate are varied.

[0007] In a further embodiment of the invention, the electrically driven machine has an electrical energy storage device. When determining the energy reserve according to step b), an amount of energy stored in the electrical energy storage device is taken into account. The electrical energy storage device can be charged with electrical energy by consuming an electrical charging power, wherein the electrical charging power is taken into account when determining the energy reserve according to step b). In this way, the energy reserve can be replenished during the conveying of thick matter. Accordingly, the range of the energy reserve can be increased during the conveying of thick matter. This increase in the energy reserve can advantageously be taken into account in the estimation according to step c).

[0008] In a further embodiment of the invention, the electrically driven machine has an electric drive for conveying the thick material. The electric drive is supplied with electrical energy from an electrical energy storage device of the electrically driven machine in order to convey the thick material. The electrically driven machine can have an electrical connection for connecting its electric drive and—alternatively or additionally—its electrical energy storage device to an (external) electrical supply network. Advantageously, the electric drive can thus be supplied with electrical energy while the electrical energy storage device is being charged.

[0009] In a further embodiment of the invention, an energy requirement / unit quantity ratio is determined during step a). The energy requirement / unit quantity ratio estimates the amount of energy required to convey the specified unit quantity of thick matter. This advantageously results in a single parameter, based on which the estimation according to step c) is possible. This parameter can be processed electronically, in particular calculated, particularly easily.

[0010] In a further embodiment of the invention, the method additionally comprises step d). According to step d), the electrically driven machine is operated based on the conveyable quantity of thick material estimated in step c). In particular, the electrically driven machine can be automatically switched between different operating modes, in which the electrically driven machine consumes different amounts of electrical energy. This enables automatic range optimization of the electrically driven machine.

[0011] In a further embodiment of the invention, the electrically driven machine has an electrical energy storage device. When performing step a), the energy requirement related to the specified unit of quantity is determined based on the current electrical power supplied by the electrical energy storage device. Alternatively or additionally, the energy requirement related to the specified unit of quantity is determined based on a past temporal profile of the electrical power supplied by the electrical energy storage device. This enables a particularly precise forecast.

[0012] In a further embodiment of the invention, the past temporal profile of the electrical power supplied from the electrical energy storage device when carrying out step a) is weighted more highly in relation to the electrical power currently supplied from the electrical energy storage device, the shorter the time period since thick matter conveying operation was restarted. In this way, power fluctuations of the electrically driven machine that deviate from an average, which fluctuations are particularly frequent and pronounced when the electrically driven machine is started up, can advantageously be compensated for. In a further embodiment of the invention, a current electrical conveying power is obtained exclusively via an electrical connection of the electrically driven machine, as long as the electrical conveying power does not exceed a maximum electrical connected load.As long as the electrical power output exceeds the maximum electrical connected load, the current electrical power output is drawn via the electrical connection at its maximum electrical connected load and additionally from the electrical energy storage device. This advantageously ensures that electrical energy is only drawn from the electrical energy storage device when the electrical connected load drawn from the electrical supply grid via the electrical connection is insufficient to operate the electrically driven machine at a predetermined operating point. This predetermined operating point can be an operating point at which the electrically driven machine achieves its greatest efficiency.

[0013] In a further embodiment of the invention, the electrical energy storage device is charged via the electrical connection as long as the electrical output does not exceed the maximum electrical connection power. This allows for the maximum electrical connection power to be utilized as effectively as possible.

[0014] In a further embodiment of the invention, based on the comparison according to step c) and the current charge level of the electrical energy storage device, a remaining possible conveyance rate of the thick material is calculated and visualized. This visualization advantageously allows an operator of the electrically driven machine to intervene in a timely manner before the available energy supply is no longer sufficient to process the quantity of thick material to be conveyed.

[0015] In a further embodiment of the invention, the proportion of the remaining possible flow rate of the slurry is calculated and visualized based on the electrical power drawn via the electrical connection. Furthermore, the proportion of the remaining possible flow rate of the slurry is calculated and visualized based on the electrical power drawn from the electrical energy storage device. The calculation and visualization can be based on the comparison according to step c). This also advantageously offers the operator options for intervention.

[0016] In a further embodiment of the invention, a desired flow rate can be specified. Based on the comparison according to step c) and the current charge level of the electrical energy storage device, it is calculated whether the desired flow rate can be delivered. This enables a particularly meaningful forecast.

[0017] In a further embodiment of the invention, the electrically driven machine for conveying viscous matter has various operating modes that differ in terms of their energy requirements per predetermined quantity conveyed. In particular, when performing step c), one of the operating modes is selected based on the desired conveyed quantity and the current charge level of the electrical energy storage device. This selection of one of the operating modes can preferably be automatic. This ensures the best possible utilization of the energy supply. The term "operating mode" can be understood as a synonym for the term "operating mode."

[0018] In a further embodiment of the invention, the method additionally comprises a step e). According to step e), a range value based on the comparison according to step c) is output, in particular displayed. The range value can reflect the amount of energy stored in an electrical energy storage device of the electrically driven machine. Alternatively or additionally, the range value can reflect the amount of thick material that can (still) be conveyed using the energy reserve, in particular in multiples of the capacity of a standard truck mixer or another volume unit. Alternatively or additionally, the method additionally comprises a step f). According to step f), a desired conveying quantity is determined, in particular entered, and a feasibility attribute is output, in particular displayed.The feasibility attribute is based on the comparison according to step c) and the desired output. The feasibility attribute can indicate whether the desired output is covered by the extractable quantity of thick matter. Alternatively or additionally, the feasibility attribute can indicate whether and / or by how much the desired output exceeds or falls short of the extractable quantity of thick matter. This enables a particularly intuitive implementation of the process.

[0019] The invention further relates to a system having an electrically driven machine for conveying thick material. The system further comprises an electronic processing unit, in particular a control device, which is connected to the electrically driven machine, in particular for data transmission. The electronic processing unit is configured to carry out a method according to the invention as described above. The aforementioned advantages of the method according to the invention therefore also apply to the system according to the invention. The electrically driven machine preferably has an electric drive and an electrical energy storage device for storing at least part of an energy supply for supplying the electric drive.

[0020] 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.

[0021] 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.

[0022] Fig. 1 shows a schematic flow chart of an embodiment of a method according to the invention, and

[0023] Fig. 2 schematically shows a structure of an embodiment of a system according to the invention.

[0024] A method according to the invention serves to predict a conveyable quantity of thick material D. The conveyable quantity of thick material D can be conveyed by means of an electrically driven machine 1. The electrically driven machine 1 is a functional component of a system 10 according to the invention. The electrically driven machine 1 serves to convey thick material D. The system 1 also has an electronic processing unit 11 which is connected to the electrically driven machine 1, for example for data transmission. The electronic processing unit 11 can be a control device. The electronic processing unit 11 is designed to carry out the method according to the invention. The electrically driven machine 1 in this case has an electric drive 3 and an electrical energy storage device 2 for storing at least part of an energy reserve EV for supplying the electric drive 3.The electric drive 3 can be controlled by means of the electronic computing unit 11.

[0025] For example, the electrically driven machine 1 also has a high-viscosity pump unit that is drive-connected to the electric drive. The high-viscosity pump unit can have delivery cylinders with variable-volume delivery chambers. For a change, in particular in opposite directions, in the volumes of the delivery chambers, the delivery cylinders can each have an adjustable delivery piston. The high-viscosity pump unit can also comprise an S-shaped S-pipe, which is fluidly connected at one end to a pressure port acting as a pump outlet. The S-pipe can be arranged in a storage chamber that can be filled with high-viscosity material from above for storing high-viscosity material. The S-pipe can be rotatably mounted at one end on the pressure port within the storage chamber. The variable-volume delivery chambers can open into the storage chamber.The S-pipe can be pivoted relative to the conveying chambers in the storage chamber such that it can be alternately fluidically connected to one of the conveying chambers. In this way, due to the counteraction of the pivoting of the S-pipe and a change in the volume of the conveying chambers, thick matter located in the storage chamber can be alternately sucked in by the conveying chambers and pumped out via the conveying chambers through the S-pipe and via the discharge nozzle. An agitator can also be arranged in the storage chamber of the thick matter pump unit. During the conveying of thick matter, the conveying pressure to be provided by the thick matter pump unit can change, for example if a conveying rate is increased and / or a geodetic pumping head is changed and / or the properties of the conveyed thick matter change.As a result of a changing delivery pressure, the delivery capacity to be provided by the thick matter pump unit also changes, and thus the energy requirement EB of the electrically driven machine 1.

[0026] The method according to the invention comprises a step a). According to step a), the energy requirement EB required by the electrically driven machine 1 to convey a predetermined unit quantity of thick material D is determined. The method further comprises a step b). According to step b), an energy reserve EV available to drive the electrically driven machine 1 is determined. Furthermore, the method comprises a step c). According to step c), the energy requirement EB per predetermined unit quantity is compared with the energy reserve EV in order to estimate the conveyable quantity of thick material D. For example, steps a), b) and - alternatively or additionally - c) are carried out before thick material D is conveyed by means of the electrically driven machine 1.

[0027] Steps a), b) and / or c) can be carried out before the high-density material D is conveyed using a parameterizable digital model of the electrically driven machine 1. The parameterizable digital model can be based on characteristic values ​​of the electrically driven machine 1 determined in the past. The parameterizable digital model can be parameterized to adapt to local peculiarities of a site, in particular a construction site. As an alternative to carrying out steps a), b) and / or c) before the high-density material is conveyed, steps a), b) and / or c) can be carried out during the high-density material conveyance. Steps a), b) and - alternatively or additionally - c) can therefore be carried out, for example, while the high-density material D is being conveyed by means of the electrically driven machine 1.Steps a), b), and / or c) can be performed continuously during the slurry extraction process. In particular, steps a), b), and / or c) are performed during the slurry extraction process in such a way that the extractable quantity of slurry D estimated according to step c) is continuously updated. In this respect, a statement regarding the still extractable quantity of slurry D can be continuously updated.

[0028] As already mentioned, the electrically driven machine 1 in the present case has an electrical energy storage device 2. When determining the energy reserve EV according to step b), an energy quantity ES stored in the electrical energy storage device 2 is taken into account. The electrical energy storage device 2 can be charged with electrical energy using an electrical charging power PL. When determining the energy reserve EV according to step b), this electrical charging power PL can be taken into account. It is therefore possible to take into account how much electrical energy is withdrawn from the electrical energy storage device 2 and how much electrical energy is supplied to the electrical energy storage device 2 by means of the electrical charging power PL.

[0029] As already mentioned, the electrically driven machine 1 in the present case has an electric drive 3 for conveying the thick material D. The electric drive 3 is supplied with electrical energy from the electrical energy storage device 2 of the electrically driven machine 1 in order to convey thick material D. For example, the electrically driven machine 1 has an electrical connection 4 for connecting its electric drive 3 to an electrical supply network V. Alternatively or additionally, the electrical connection 4 can be designed to connect the electrical energy storage device 2 to the electrical supply network V. The electrical supply network V can be an external, for example public, electrical supply network V. However, it is also conceivable for the electrical supply network V to be a local electrical supply network V present in the area of ​​use.The electrical connection 4 can be designed to be connected to a supply network V of different current strength.

[0030] For example, when performing step a), an energy requirement / unit quantity ratio is determined. The energy requirement / unit quantity ratio estimates the amount of energy required to convey the specified unit quantity of thick material D. In the embodiment according to Fig. 1, the method additionally comprises a step d). According to step d), the electrically driven machine 1 is operated based on the conveyable quantity of thick material D estimated in step c).

[0031] For example, when performing step a), the energy requirement EB related to the specified unit of quantity is determined based on a current electrical power PG supplied from the electrical energy storage device 2. Alternatively or additionally, the energy requirement EB is determined based on a previous temporal profile of the electrical power PG supplied from the electrical energy storage device 2. The previous temporal profile of the electrical power PG supplied from the electrical energy storage device 2 when performing step a) related to the current electrical power PG supplied from the electrical energy storage device 2 can be weighted more highly, the shorter the time period since a thick matter conveying operation was restarted.Particularly at the beginning of the thick matter conveying operation—for example, when the electric machine 1 is restarted—the electrical power PG supplied by the electrical energy storage unit 2 can deviate significantly from the average electrical power PG supplied by the electrical energy storage unit 2. This can be at least partially compensated for by the weighting mentioned above. The electronic processing unit 11 can have a machine learning algorithm that can learn automatically from past operating data of the system 10 in order to successively refine the accuracy of the forecast using the method according to the invention.

[0032] For example, a current electrical conveying power PF is drawn exclusively via the electrical connection 4 of the electrically driven machine 1, as long as the electrical conveying power PF does not exceed a maximum electrical connected load PA. The current electrical conveying power PF is drawn via the electrical connection 4 with its maximum electrical connected load PA and additionally from the electrical energy storage device 2, as long as the electrical conveying power PF exceeds the maximum electrical connected load PA. If the maximum electrical connected load PA is therefore not sufficient to provide the electrical conveying power PF required for conveying thick matter on its own, part of the electrical conveying power PF can additionally be drawn from the electrical energy storage device 2.Conversely, it is possible to dispense with energy extraction from the electrical energy storage device 2 if the maximum electrical connection power PA is sufficient to provide the electrical output power PF. As long as the electrical output power PF does not exceed the maximum electrical connection power, the electrical energy storage device 2 can be charged via the electrical connection 4.

[0033] For example, based on the comparison according to step c) and a current state of charge LZ of the electrical energy storage device 2, a remaining possible delivery rate of the thick material D is calculated. In addition, the remaining possible delivery rate of the thick material D can be visualized. For example, it is calculated and visualized which proportion of the remaining possible delivery rate of the thick material D is based on the electrical power PB drawn via the electrical connection 4 and which proportion of the remaining possible delivery rate of the thick material D is based on the electrical power PG drawn from the electrical energy storage device 2.

[0034] For example, a desired flow rate can be specified. Based on the comparison in step c) and the current state of charge LZ of the electrical energy storage device 2, a calculation is made as to whether the desired flow rate can be achieved. The result of this calculation can also be visualized.

[0035] The visualization described above can help the operator of system 10 understand the benefits of using a power distribution connection available on a construction site. It is also possible to deliberately leave a specific residual amount of electrical energy in the electrical energy storage unit 2 so that this residual amount can be used for subsequent work on a construction site.

[0036] The electrically driven machine 1 for conveying thick matter D can have various operating modes. These operating modes differ, for example, in terms of their energy requirements per predetermined quantity unit conveyed. In this case, one of the operating modes can be selected based on the desired conveyed quantity and the current charge state LZ of the electrical energy storage device 2 - particularly when carrying out step c). This selection of one of the operating modes can be made automatically. The electrically driven machine 1 can thus be automatically switched to an energy-saving mode if it turns out that the energy reserve EV is not sufficient for the predetermined quantity unit of thick matter D during normal operation of the electrically driven machine 1. In an energy-optimized operating mode, a piston speed of the thick matter pump unit can be reduced.In addition, auxiliary consumers such as the agitator and any coolers or filters can be optionally deactivated. This adjustment can be made gradually, so that not only the energy-optimized operating mode is available, but several operating modes that can successively reduce the energy consumption of the electrically driven machine 1.

[0037] The method according to Fig. 1 additionally comprises a step e). According to step e), a range value is output, for example displayed. The range value is based on the comparison according to step c). The range value can reflect the amount of energy ES stored in the electrical energy storage device 2 of the electrically driven machine 1. Alternatively or additionally, the range value can reflect the amount of thick material D that can still be conveyed using the energy reserve EV. For example, the amount of thick material D that can still be conveyed can be specified as a multiple of the capacity of a standard truck mixer or another volume unit. The amount that can still be conveyed can be specified in cubic meters per hour or cubic yards per hour. The “amount that can still be conveyed” can be referred to as the “remaining conveyed amount”.

[0038] According to Fig. 1, the method also comprises a step f). According to step f), a desired delivery rate is determined. For example, the desired delivery rate can be entered. According to step f), a feasibility attribute is also output, in particular displayed, which is based on the comparison according to step c) and the desired delivery rate. The feasibility attribute can indicate whether the desired delivery rate is covered by the deliverable quantity of thick matter. Alternatively or additionally, the feasibility attribute can indicate whether and / or by how much the desired delivery rate exceeds or falls short of the deliverable quantity of thick matter D. The feasibility attribute can, for example, indicate whether the energy reserve EV is sufficient, just barely sufficient, or not sufficient to deliver the desired delivery rate.

[0039] Based on the parameterizable digital model of the electrically driven machine 1 mentioned above, a construction site planning system can be implemented. This construction site planning system can be a computer program product that can be executed on a conventional computer. Using the computer program product, it can be simulated how many electrically driven machines are required to convey thick material on a specific construction site. The simulated construction site can also be present as a parameterizable digital model of the construction site planning system. The parameterizable digital model(s) can be parameterized depending on specific local conditions of a simulated construction site and / or the electrically driven machine 1. For example, a specific local condition can be a locally available electrical supply network V and its specifications.Depending on the specification, the electrical supply network V can, for example, supply electrical current with a current of 16 A, 32 A, 63 A, or 125 A. It is also possible that no electrical supply network V is present at the simulated construction site, so that the electrically driven machine 1 can be supplied exclusively with electrical energy from the electrical energy storage device 2.

Claims

Patent claims 1. Method for predicting a conveyable quantity of thick material (D), wherein the conveyable quantity can be conveyed by means of an electrically driven machine (1), the method comprising the following steps: a) determining an energy requirement (EB) which the electrically driven machine (1) requires for conveying a predetermined unit quantity of thick material (D), b) determining an energy reserve (EV) which is available for driving the electrically driven machine (1), and c) comparing the energy requirement (EB) per predetermined unit quantity with the energy reserve (EV) in order to estimate the conveyable quantity of thick material (D).

2. Method according to claim 1, characterized in that steps a), b) and / or c), in particular based on a parameterizable digital model of the electrically driven machine (1), are carried out before thick material (D) is conveyed by means of the electrically driven machine (1), and / or that steps a), b) and / or c), in particular in continuous repetition, are carried out while thick material (D) is conveyed by means of the electrically driven machine (1), in particular in such a way that the (still) conveyable quantity of thick material (D) estimated according to step c) is continuously updated.

3. Method according to one of the preceding claims, characterized in that the electrically driven machine (1) has an electrical energy store (2), and when determining the energy reserve (EV) according to step b), an energy quantity (ES) stored in the electrical energy store (2) is taken into account, in particular wherein the electrical energy store (2) is charged with electrical energy by absorbing an electrical charging power (PL) and when determining the energy reserve (EV) according to step b), the electrical charging power (PL) is taken into account.

4. Method according to one of the preceding claims, characterized in that the electrically driven machine (1) has an electric drive (3) for conveying the thick material (D), and the electric drive (3) is supplied with electrical energy from an electrical energy store (2) of the electrically driven machine (1) in order to convey thick material (D), in particular wherein the electrically driven machine (1) has an electrical connection (4) for connecting its electric drive (3) and / or its electrical energy store (2) to an (external) electrical supply network (V).

5. Method according to one of the preceding claims, characterized in that when carrying out step a) an energy requirement / unit quantity quotient is determined which estimates an amount of energy necessary to convey the predetermined unit quantity of thick material (D).

6. Method according to one of the preceding claims, characterized in that the method comprises the following additional step: d) operating the electrically driven machine (1) based on the conveyable quantity of thick material (D) estimated according to step c).

7. Method according to one of the preceding claims, characterized in that the electrically driven machine (1) has an electrical energy store (2), and when carrying out step a) the energy requirement (EB) related to the predetermined unit of quantity is determined based on a current electrical power (PG) supplied from the electrical energy store (2), and / or a past temporal profile of the electrical power (PG) supplied from the electrical energy store (2).

8. The method according to claim 7, characterized in that the past temporal profile of the electrical power (PG) supplied from the electrical energy storage device (2) when carrying out step a) is weighted more highly in relation to the electrical power (PG) currently supplied from the electrical energy storage device (2), the shorter the time period since a thick matter conveying operation was restarted.

9. Method according to claim 7 or 8, characterized in that a current electrical conveying power (PF) is obtained exclusively via an electrical connection (4) of the electrically driven machine (1) as long as the electrical delivery power (PF) does not exceed a maximum electrical connected load (PA), and the current electrical delivery power (PF) is drawn via the electrical connection (4) with its maximum electrical connected load (PA) and additionally from the electrical energy store (2) as long as the electrical delivery power (PF) exceeds the maximum electrical connected load (PA). Method according to claim 9, characterized in that as long as the electrical delivery power (PF) does not exceed the maximum electrical connected load (PA), the electrical energy store (2) is charged via the electrical connection (4). Method according to one of claims 7 to 10, characterized in that based on the comparison according to step c) and a current state of charge (LZ) of the electrical energy store (2), a still remaining possible delivery rate of the thick material (D) is calculated and visualized.Method according to one of claims 7 to 11, characterized in that it is calculated and visualized, in particular based on the comparison according to step c), which proportion of the still remaining possible delivery rate of the thick material (D) is based on the electrical power (PB) drawn via the electrical connection (4) and which proportion of the still remaining possible delivery rate of the thick material (D) is based on the electrical power (PG) drawn from the electrical energy store (2). Method according to one of claims 7 to 12, characterized in that a desired delivery rate can be specified, wherein based on the comparison according to step c) and a current state of charge (LZ) of the electrical energy store (2), it is calculated whether the desired delivery rate can be delivered.Method according to claim 13, characterized in that the electrically driven machine (1) for conveying thick material (D) has different operating modes which differ with regard to their energy requirement (EB) per predetermined quantity unit conveyed, wherein, in particular when carrying out step c), one of the operating modes is selected based on the desired conveyed quantity and based on the current state of charge (LZ) of the electrical energy store (2).

15. Method according to one of the preceding claims, characterized in that the method additionally comprises at least one of the following steps e) and f): e) Outputting, in particular displaying, a range value based on the comparison according to step c), wherein the range value in particular reflects - how large an amount of energy (ES) stored in an electrical energy storage device (2) of the electrically driven machine (1) is and / or - how large the quantity of thick matter (D) that can (still) be conveyed by means of the energy reserve (EV) is, in particular in multiples of the capacity of a standard truck mixer or another volume unit; f) setting, in particular entering, a desired conveying quantity and outputting, in particular displaying, a feasibility attribute that is based on the comparison according to step c) and the desired conveying quantity, wherein the feasibility attribute in particular reflects - whether the desired flow rate is covered by the pumpable quantity of thick matter (D), and / or - whether and / or by how much the desired conveying quantity exceeds or falls short of the conveyable quantity of thick matter (D).

16. System (10) comprising an electrically driven machine (1) for conveying thick material (D), an electronic computing unit (11), in particular a control device, which is connected to the electrically driven machine (1), in particular for transmitting data, wherein the electronic computing unit (11) is set up to carry out a method according to one of the preceding claims, in particular wherein the electrically driven machine (1) has an electric drive (3) and an electrical energy store (2) for storing at least part of an energy supply (EV) for supplying the electric drive (3).

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