System comprising a mobile work machine, in particular a forklift truck, and an external server

Abstract

The invention relates to a system (25) comprising a mobile work machine (1a), in particular a forklift truck (1), wherein the mobile work machine (1a) has a first component (16) and a determining device (18) configured to determine an operating parameter of the first component (16), wherein the mobile work machine (1a) has a controller (19) configured to determine, based on the determined operating parameter, whether a fault condition of the first component (16) exists, wherein the mobile work machine (1a) has a communication interface (21) connected to the controller (19) and connected to a communication network (23), and wherein the controller (19) is configured to transmit an error message via the communication interface (21) to the communication network (23) when a fault condition of the first component (16) exists, and an external server (27).which has a server communication interface (31) which is connected to the communication network (23) and is configured to receive the error message transmitted from the control unit (19) of the mobile working machine (1a) to the communication network (23), wherein the external server (27) has a server control unit (33) which is configured to determine, based on the received error message, whether the mobile working machine (1a) needs to be equipped with a second retrofit component in order to avoid the fault condition of the first component (16).

Description

[0001] The invention relates to a system comprising a mobile work machine, in particular an industrial truck, and an external server, wherein a server controller of the external server is designed to determine, on the basis of a received error message, whether the mobile work machine must be equipped with a second retrofit component in order to avoid an error condition of a first component of the mobile work machine.

[0002] Furthermore, the invention relates to a method for assessing the necessity of retrofitting a mobile work machine, in particular an industrial truck, with a second retrofit component in a system.

[0003] Mobile work machines designed as industrial trucks are known, for example, as counterbalance forklifts, reach trucks, and warehouse equipment. These industrial trucks are used extensively on company premises and in storage areas, such as warehouses, to transport goods. These industrial trucks have height-adjustable load handling devices on a lifting mast to pick up goods, move them accordingly within the respective warehouses, and then deposit them again.

[0004] Mobile machines, such as industrial trucks, often have expensive components that are installed as standard to ensure 100% functionality even in very extreme and / or very rare applications or scenarios. This leads to increased manufacturing costs and increased service costs for conventional mobile machines. In many application scenarios for conventional mobile machines, these often expensive components are rarely or never required.

[0005] A mobile work machine, for example an industrial truck, typically has a battery-electric drive with an electric traction battery and at least one electric traction motor connected to the traction battery, which can set one or more drive wheels of the mobile work machine in motion to move the mobile work machine. When the mobile work machine is decelerated by means of generator operation of the electric traction motor, the kinetic energy of the mobile work machine can be converted into electrical energy, which can be used as recuperation energy to electrically charge the traction battery.In certain very rare cases, however, it may happen that, for example, when the traction battery is fully charged, if the mobile work machine is braked sharply or the loaded load-handling device is lowered and the energy is recovered accordingly, the electrical energy generated could overcharge and thus damage the traction battery, and thus the traction energy, for example a lithium-ion battery, cannot fully absorb the electrical energy generated as recuperation energy.

[0006] To prevent this, conventional mobile work machines, such as industrial trucks, are equipped with an electrical braking resistor as standard. This resistor is designed to convert the generated electrical energy into heat and dissipate it when the traction battery cannot fully absorb the generated electrical energy as recuperation energy, thus preventing the traction battery from overcharging. However, such a scenario occurs very rarely or never, so in the majority of conventional mobile work machines, a corresponding electrical braking resistor is not used and is therefore unnecessary.

[0007] However, if the very rare case does occur, completely omitting an appropriate electrical braking resistor in a conventional mobile work machine, such as an industrial truck, can lead to overcharging and thus damage to the traction battery.

[0008] The present invention is based on the object of providing a system comprising a mobile work machine, in particular an industrial truck, which overcomes the aforementioned disadvantages.

[0009] This object is achieved according to a first aspect by a system comprising a mobile work machine, in particular an industrial truck, wherein the mobile work machine has a first component and a determination device which is designed to determine an operating parameter of the first component, wherein the mobile work machine has a controller which is designed to determine, on the basis of the determined operating parameter, whether an error condition of the first component exists, wherein the mobile work machine has a communication interface which is connected to the controller in terms of control technology and is connected to a communication network, and wherein the controller is designed to transmit an error message to the communication network via the communication interface when an error condition of the first component exists, and an external server which has a server communication interface,which is connected to the communication network and configured to receive the error message transmitted from the controller of the mobile work machine to the communication network, wherein the external server has a server controller configured to determine, based on the received error message, whether the mobile work machine needs to be equipped with a second retrofit component in order to avoid the error condition of the first component.

[0010] This provides the technical advantage that the external server in the system can determine in a decentralized manner whether the mobile work machine, for example an industrial truck, needs to be equipped with a second retrofit component.

[0011] This is achieved by the mobile work machine itself monitoring the operation of the first component by means of the determination device based on the determined operating parameter and, if an error condition occurs, transmitting an error message via the communication network to the external server, which then determines whether the mobile work machine needs to be equipped with a second retrofit component in order to then inform a service technician to install the second retrofit component if necessary.

[0012] Thus, by monitoring the operational conditions, characterized by the operating parameters of the first component, extreme operating conditions of the mobile machine can be identified in which full functionality cannot be provided. In this case, an error message, if necessary with corresponding operational parameters, is sent to the external server, such as a database, in particular a cloud, of the manufacturer of the mobile machine, whereby the external server regularly searches for a corresponding transmitted error message. If a corresponding error message is detected, a corresponding second retrofit component can be retrofitted by the external server via a service technician so that the mobile machine can be provided with full functionality in all operational conditions in the future.

[0013] In an advantageous embodiment, the controller is designed to determine whether a fault condition of the first component exists if the determined operating parameter of the first component deviates from a predetermined reference parameter of the first component, in particular if the determined operating parameter of the first component deviates from the predetermined reference parameter of the first component by a deviation value which is greater than a predetermined deviation threshold value.

[0014] This achieves the technical advantage that effective error detection can be carried out by the control system, since the determined operating parameter of the first component only has to be compared with a predetermined reference parameter of the first component, which represents a normal state of the first component.

[0015] In this case, the predetermined reference parameter of the first component can, in particular, have a deviation value as a tolerance, so that a deviation within the corresponding tolerance is not taken into account. Only if the determined operating parameter deviates from the predetermined reference parameter by a deviation value that is greater than a predetermined deviation threshold value, is the controller assumed to have an error condition and transmits an error message to the communications network.

[0016] In an advantageous embodiment, the controller is designed to determine that no fault condition of the first component exists if the determined operating parameter of the first component corresponds to the predetermined reference parameter of the first component, in particular if the determined operating parameter of the first component deviates from the predetermined reference parameter of the first component by a deviation value which is less than a predetermined deviation threshold value.

[0017] This achieves the technical advantage that if the determined operating parameter of the first component matches the predetermined reference parameter, it can be assumed that the first component is operating without errors, in particular even if there is a minimal deviation within the tolerance range.

[0018] In an advantageous embodiment, the server controller is designed to determine whether the mobile work machine needs to be equipped with a second retrofit component if the number of detected error messages exceeds a predetermined reference number of error messages.

[0019] This achieves the technical advantage that retrofitting with the second retrofit component is only carried out if the error message occurs once or multiple times. In particular, the predetermined reference number of error messages is one or more than one.

[0020] In particular, the server controller is configured to determine whether the mobile work machine needs to be equipped with a second retrofit component if the number of detected error messages deviates from a predetermined reference number of error messages by a message deviation value that is greater than a predetermined message deviation threshold. The message deviation value provides a certain margin for the server controller, so that equipping the mobile work machine with a second retrofit component is only considered necessary if the reference number of error messages is observed to be exceeded.

[0021] In an advantageous embodiment, the server controller is designed to determine whether the mobile work machine does not need to be equipped with a second retrofit component if the number of detected error messages corresponds to a predetermined reference number of error messages.

[0022] This provides the technical advantage that a small number of error messages, especially a one-time error message, can be ignored by the server control.

[0023] In particular, the server controller is configured to determine whether the mobile work machine does not need to be equipped with a second retrofit component if the number of detected error messages deviates from a predetermined reference number of error messages by a message deviation value which is less than a predetermined message deviation threshold value.

[0024] In an advantageous embodiment, the server controller is designed to transmit a retrofit notification to an external communication device via the server communication interface and the communication network, in particular to transmit it when the number of detected error messages exceeds the predetermined reference number of error messages, in order to prompt a service technician to install the second retrofit component in the mobile work machine.

[0025] This achieves the technical advantage that the server control can effectively and automatically commission the service technician directly via the communication network using the external communication device, such as a service technician's smartphone.

[0026] In an advantageous embodiment, the controller is designed to transmit the error message to the communication network via the communication interface if, after a further determination of a further operating parameter of the first component by the determination device, the controller determines on the basis of the detected further operating parameter whether a further error condition of the first component exists.

[0027] This achieves the technical advantage that the control system of the industrial truck waits before transmitting the error message in case another error condition of the first component can be detected.

[0028] In an advantageous embodiment, the first component of the mobile work machine comprises an electric traction battery, in particular a lithium-ion battery, and the determination device comprises a battery management system which is designed to determine a recuperation energy absorbable by the traction battery as an operating parameter of the traction battery, wherein the controller of the mobile work machine is designed to determine whether a fault condition of the electric traction battery exists, wherein a fault condition of the traction battery exists when the kinetic and / or potential energy of the mobile work machine must be reduced to the recuperation energy of the traction battery, wherein the controller is designed to transmit an error message to the communication network via the communication interface when the fault condition of the first component exists,and wherein the server controller of the external server is configured to determine, based on the received error message, whether the mobile work machine needs to be equipped with an electrical braking resistor as a second retrofit component in order to avoid a reduction of the kinetic and / or potential energy of the mobile work machine to the recuperation energy of the traction battery.

[0029] This achieves the technical advantage that a correspondingly expensive electrical braking resistor is only installed as a second retrofit component in the mobile work machine, for example an industrial truck, when there is a real need, i.e. when the kinetic and / or potential energy of the mobile work machine must be reduced to the recuperation energy of the traction battery in order to prevent the mobile work machine from recuperating too much recuperation energy into the traction energy, which cannot be absorbed by the traction battery.

[0030] In an advantageous embodiment, the control is designed to determine the recuperation energy that can be absorbed by the traction battery as a function of at least one of the following parameters: temperature of the electric traction battery, state of charge of the traction battery, time period after the start of the mobile work machine.

[0031] This achieves the technical advantage that the corresponding application and operating parameters that influence the recuperation energy that can be absorbed by the traction battery are taken into account when determining the recuperation energy that can be absorbed by the traction battery.

[0032] In an advantageous embodiment, the mobile work machine has an electric traction motor electrically connected to the electric traction battery for driving the mobile work machine, and the controller is designed to reduce an electrical power consumption of the electric traction motor when the fault condition of the electric traction battery is present.

[0033] This achieves the technical advantage that, when the traction battery fault condition exists, the driving speed of the mobile work machine and thus the kinetic energy of the mobile work machine is reduced by reducing the electrical power consumption of the traction motor, so that, when the traction battery fault condition exists, a corresponding recuperation energy generated when braking the mobile work machine by means of the electric traction motor can be reduced.

[0034] In an advantageous embodiment, the mobile work machine has a mechanical brake which is designed to reduce a travel speed of the mobile work machine, and the controller is designed to activate the mechanical brake when the fault condition of the electric traction battery is present in order to reduce the travel speed of the mobile work machine.

[0035] This achieves the technical advantage that, when the traction battery fault condition exists, the driving speed of the mobile work machine and thus the kinetic energy of the mobile work machine is reduced by activating the mechanical brake, so that, when the traction battery fault condition exists, the corresponding recuperation energy generated when braking the mobile work machine by means of the electric traction motor can be reduced.

[0036] In an advantageous embodiment, the second retrofit component is not part of the mobile work machine at the time the controller determines whether a fault condition of the first component exists.

[0037] This provides the technical and commercial advantage that the second retrofit component is only installed in the mobile work machine when there is a real need for it.

[0038] The object is achieved according to a second aspect by a method for assessing the need to retrofit a mobile work machine, in particular an industrial truck, with a second retrofit component in a system, wherein the system comprises a mobile work machine, in particular an industrial truck, and an external server, wherein the mobile work machine has a first component and a determination device, wherein the mobile work machine has a controller, wherein the mobile work machine has a communication interface which is connected to the controller in terms of control technology and is connected to a communication network, wherein the external server has a server communication interface which is connected to the communication network, and wherein the external server has a server controller,The method comprises the following method steps: determining an operating parameter of the first component by the determining device, determining, based on the determined operating parameter, whether a fault condition of the first component exists by the controller, transmitting an error message via the communication interface to the communication network if a fault condition of the first component exists by the controller, receiving the error message transmitted from the controller of the mobile work machine to the communication network by the server communication interface of the external server, determining, based on the received error message, whether the mobile work machine needs to be equipped with a second retrofit component in order to avoid the fault condition of the first component.

[0039] This provides the technical advantage that the mobile work machine, for example an industrial truck, can be effectively retrofitted with the second retrofit component.

[0040] In an advantageous embodiment, the system comprises an external communication device, wherein the method comprises the further method step: transmitting a retrofit instruction to the external communication device in order to prompt a service technician to install the second retrofit component in the mobile work machine.

[0041] This provides the technical advantage of ensuring effective retrofitting with the second retrofit component.

[0042] In an advantageous embodiment, the first component of the mobile work machine comprises an electric traction battery, in particular a lithium-ion battery, and the determination device comprises a battery management system, wherein the method comprises the following method steps: determining the recuperation energy that can be absorbed by the traction battery as an operating parameter by the determination device, determining whether a fault condition of the electric traction battery exists, wherein a fault condition of the traction battery exists if the kinetic and / or potential energy of the mobile work machine must be reduced to the recuperation energy that can be absorbed by the traction battery, by the controller, transmitting an error message via the communication interface to the communication network if a fault condition of the first component exists by the controller,Receiving an error message transmitted from the controller of the mobile work machine to the communication network via the server communication interface of the external server. Determining by the server controller, based on the received error message, whether the mobile work machine needs to be equipped with an electrical braking resistor as a second retrofit component in order to avoid a reduction of the kinetic and / or potential energy of the mobile work machine to the recuperation energy of the traction battery.

[0043] This provides the technical advantage of ensuring effective retrofitting with the electrical braking resistor.

[0044] The embodiments mentioned for the mobile work machine according to the first aspect are also embodiments for the method according to the second aspect and vice versa.

[0045] Further advantages and details of the invention are explained in more detail by way of example with reference to the embodiments shown in the schematic figures. The Fig. 1 shows a mobile work machine designed as an industrial truck with a traction battery, a controller and a communication interface according to an exemplary embodiment, The Fig. 2 shows a system comprising the Fig. 1 illustrated mobile work machine and an external server according to an embodiment example and The Fig. 3 shows a schematic representation of a method for assessing the necessity of retrofitting a mobile work machine designed as an industrial truck with a second retrofit component in a system according to an embodiment.

[0046] The Fig. 1 shows a mobile work machine 1a designed, for example, as an industrial truck 1 with a battery-electric drive according to an exemplary embodiment.

[0047] The Fig. The industrial truck 1 shown in Figure 1, in particular a forklift truck, has a vehicle housing 3 with a driver's cab 5 in which a driver of the industrial truck 1 can sit. The industrial truck 1 has a height-adjustable load-handling device 9, in particular a load fork, arranged on a lifting mast 7, by means of which the industrial truck 1 can pick up and set down loads.

[0048] The industrial truck 1 has drive wheels 11, by means of which the industrial truck 1 can move on a surface 13, for example the floor of a warehouse. In order to drive the drive wheels 11, the industrial truck 1 has a Fig. 1 has an electric drive 15 arranged on the axle, in particular the front axle and / or rear axle, which is only shown schematically.

[0049] In the Fig. 1 also schematically shows an electric traction battery 17, in particular a lithium-ion battery, which represents a first component 16 according to the present invention. The first component 16, or the traction battery 17, is electrically connected to the electric drive 15 in order to supply the electric drive 15, in particular a Fig. 1 not shown electric traction motor of the electric drive 15, to provide electrical energy for operating the electric drive 15.

[0050] The electric drive 15 of the industrial truck 1 is also capable of recuperation, ie during a braking operation of the industrial truck 1, at least part of the braking energy of the industrial truck 1 can be converted into electrical energy by the electric drive 15 through a generator operation of the electric drive motor and made available to the traction battery 17 as recuperation energy in order to recharge the traction battery 17.

[0051] A control 19 of the industrial truck 1 is in the Fig. 1 is shown only schematically. The industrial truck 1 has a schematically shown determination device 18, which is designed to determine an operating parameter of the first component 16, in particular the traction battery 17. The determination device 18 is connected in terms of control technology to the traction battery 17 and the controller 19, which is connected in terms of control technology to a communication interface 21 of the industrial truck 1. As can be seen from the Fig. 1, the communication interface 21 is in turn connected to a communication network 23.

[0052] The Fig. 2 shows a system 25 comprising the Fig. 1 illustrated industrial truck 1 and an external server 27 according to an exemplary embodiment.

[0053] The Fig. The system 25 shown in Figure 2 instructs the industrial truck 1 according to the Fig. 1 and an external server 27 and optionally an external communication device 29.

[0054] As in the Fig. 1 has already been explained in detail, the industrial truck 1 has a traction battery 17 designed as the first component 16, which is connected in terms of control technology to the determination device 18, which is connected in terms of control technology to the controller 19 of the industrial truck 1, wherein the controller 19 is connected in terms of control technology to the communication interface 21 of the industrial truck 1, which in turn is connected to the communication network 23.

[0055] The external server 27 has a server communication interface 31, which is connected to the communication network 23 and is configured to communicate with the communication interface 21 of the industrial truck 1 via the communication network 23. The external server 27 further has a server controller 33, which is connected to the server communication interface 31 for control purposes.

[0056] As from the Fig. 2, the server communication interface 31 is further connected via the communication network 23 to an external communication device 29, such as a smartphone of a service technician.

[0057] The Fig. 1 and Fig. The determination device 18 shown in Figure 2 is designed to determine an operating parameter of the first component 16, in particular the traction battery 17, of the industrial truck 1. According to the present exemplary embodiment, the determination device 18 comprises a battery management system designed to determine a recuperation energy absorbable by the traction battery 17 as an operating parameter of the traction battery 17.

[0058] The controller 19 of the industrial truck 1 is configured to determine, based on the determined operating parameter of the first component 16, whether a fault condition exists in the electric traction battery 17. According to the present exemplary embodiment, a fault condition exists in the traction battery 17 when the kinetic and / or potential energy of the industrial truck 1 must be reduced to the recuperation energy absorbed by the traction battery 17.

[0059] When the industrial truck 1 is braked by a generator operation of the electric drive motor, the kinetic energy of the industrial truck 1 is predominantly converted into electrical energy and supplied to the traction battery 17 as recuperation energy and / or when the load handling device 9 is lowered with a correspondingly loaded load, the corresponding potential energy of the load of the industrial truck 1 is predominantly converted into electrical energy and supplied to the traction battery 17 as recuperation energy, which may under certain circumstances lead to an overcharge and thus to damage of the traction battery 17 if the traction battery 17 is fully charged, for example immediately after the industrial truck starts moving after a full charging process.

[0060] In conventional industrial trucks 1, an electrical braking resistor is used to absorb corresponding excess energy, which converts corresponding excess electrical energy provided by recuperation, which cannot be absorbed by the traction battery, into heat and thereby dissipates it from the industrial truck 1.

[0061] However, the industrial truck 1 according to the present invention does not have a corresponding electrical braking resistor as standard, since a corresponding extreme operating situation occurs only very rarely in a large number of application scenarios of the industrial truck 1, and thus the design of the industrial truck 1 is simplified by omitting the electrical braking resistor.

[0062] If, as in the present case, in an industrial truck 1 according to the invention without the electrical braking resistor, the kinetic and / or potential energy of the industrial truck 1 must now be reduced to the recuperation energy that can be absorbed by the traction battery 17, the controller 19 of the industrial truck 1 determines that a fault condition of the electrical traction battery 17 exists.

[0063] In this case, the controller 19 is designed to transmit an error message to the communication network 23 via the communication interface 21 of the industrial truck 1 if the error condition of the first component 16 or the traction battery 17 is present.

[0064] The server communication interface 31 of the external server 27 is connected to the communication network 23 and is designed to receive the corresponding error message transmitted from the controller 19 of the industrial truck 1 to the communication network 23.

[0065] The server controller 33 of the external server 27 is configured to determine, based on the received error message, whether the industrial truck 1 needs to be equipped with a second retrofit component, in particular with an electrical braking resistor, in order to avoid the error condition, in particular the reduction of the kinetic and / or potential energy of the industrial truck 1 to the recuperation energy of the traction battery 17.

[0066] The server controller 33 is optionally designed to transmit a retrofit notice to the external communication device 29, such as a smartphone of a service technician, via the server communication interface 31 and the communication network 23 in order to prompt a service technician to install the second retrofit component, in particular the electrical braking resistor, in the industrial truck 1.

[0067] The corresponding transmission of the retrofitting notice can, for example, take place if the number of error messages recorded exceeds a predetermined minimum number of error messages, in order to prompt the service technician to install the second retrofitting component, in particular the electrical braking resistor, in the industrial truck 1 only if corresponding adverse situations occur frequently.

[0068] This ensures that corresponding expensive components, such as an electrical braking resistor, are only installed in the industrial truck 1 when there is a real need for them in the industrial truck 1, whereby the manufacturing costs of the industrial truck 1 can be reduced.

[0069] The controller 19 is in particular designed to determine the recuperation energy that can be absorbed by the traction battery 17 as a function of at least one of the following parameters: temperature of the electric traction battery 17, state of charge of the traction battery 17, time period after the start of the industrial truck 1.

[0070] As a further safety measure, the controller 19 is particularly designed to reduce the electrical power consumption of the electric traction motor of the electric drive 15 when the fault condition of the electric traction battery 17 is present, in order to reduce the kinetic energy of the industrial truck 1 to the recuperation energy absorbed by the traction battery 17 by appropriately limiting the travel speed of the industrial truck 1 when the fault condition of the traction battery 17 is present. This simply ensures that the electric traction battery 17 does not become overcharged without the presence of the electrical braking resistor as a second retrofit component.

[0071] As a further safety measure, the controller 19 is designed in particular to activate an electrically actuatable mechanical brake of the industrial truck 1 when the fault condition of the electric traction battery 17 is present, in order to reduce the kinetic energy of the industrial truck 1 to the recuperation energy that can be absorbed by the traction battery 17 by means of a corresponding mechanical braking of the industrial truck 1 by the mechanical brake when the fault condition of the traction battery 17 is present.

[0072] The Fig. 3 shows a schematic representation of a method for assessing the need to retrofit an industrial truck with a second retrofit component in a system according to an embodiment.

[0073] The first method step comprises determining 51 an operating parameter of the first component 16 by the determining device 18.

[0074] The second method step comprises determining 53, on the basis of the determined operating parameter, whether a fault condition of the first component 16 exists, by the controller 19.

[0075] The third method step comprises the transmission 55 of an error message via the communication interface 21 to the communication network 23 when an error condition of the first component 16 exists by the controller 19.

[0076] The fourth method step comprises receiving 57 the error message transmitted from the controller 19 of the industrial truck 1 to the communication network 23 by the server communication interface 31 of the external server 27.

[0077] The fifth method step comprises determining 59 by the server controller 33 on the basis of the received error message whether the industrial truck 1 must be equipped with a second retrofit component in order to avoid the error condition of the first component 16.

[0078] The invention is not limited to the industrial truck 1 shown in the embodiment, but can be used in any mobile work machine 1a with an electric drive 15. List of reference symbols 1 industrial truck 1a mobile work machine 3 vehicle housing 5 Driver's cab 7 lifting mast 9 Load handling equipment 11 wheels 13 Underground 15 Electric drive 16 First component 17 Traction battery 19 Control 21 Communication interface 23 Communication network 25 systems 27 External Server 29 External communication device 31 Server communication interface 33 Server control 50 Procedure for assessing the need to retrofit an industrial truck with a second retrofit component in a system 51 First process step: Determining an operating parameter of the first component 53 Second process step: Determine whether a fault condition of the first component exists 55 Third procedural step: Transmitting an error message 57 Fourth step: Receiving the error message 59 Fifth process step: Determine whether the industrial truck needs to be equipped with a second retrofit component

Claims

[1] System (25) comprising: a mobile work machine (1a), in particular an industrial truck (1); wherein the mobile work machine (1a) has a first component (16) and a determination device (18) which is designed to determine an operating parameter of the first component (16), wherein the mobile work machine (1a) has a controller (19) which is designed to determine, on the basis of the determined operating parameter, whether a fault condition of the first component (16) exists, wherein the mobile work machine (1a) has a communication interface (21) which is connected to the controller (19) for control purposes and which is connected to a communication network (23), and wherein the controller (19) is designed to transmit an error message to the communication network (23) via the communication interface (21) when an error condition of the first component (16) occurs; and an external server (27) having a server communication interface (31) connected to the communication network (23) and designed to receive the error message transmitted from the controller (19) of the mobile work machine (1a) to the communication network (23), wherein the external server (27) has a server controller (33) which is designed to determine, on the basis of the received error message, whether the mobile work machine (1a) needs to be equipped with a second retrofit component in order to avoid the error condition of the first component (16). [2] System (25) according to claim 1, characterized byin that the controller (19) is designed to determine whether a fault condition of the first component (16) exists if the determined operating parameter of the first component (16) deviates from a predetermined reference parameter of the first component (16), in particular if the determined operating parameter of the first component (16) deviates from the predetermined reference parameter of the first component (16) by a deviation value which is greater than a predetermined deviation threshold value. [3] System (25) according to claim 1 or 2, characterized byin that the controller (19) is designed to determine that no fault condition of the first component (16) exists if the determined operating parameter of the first component (16) corresponds to the predetermined reference parameter of the first component (16), in particular if the determined operating parameter of the first component (16) deviates from the predetermined reference parameter of the first component (16) by a deviation value which is less than a predetermined deviation threshold value. [4] System (25) according to one of the preceding claims, characterized by that the server controller (33) is designed to determine whether the mobile work machine (1a) needs to be equipped with a second retrofit component if the number of detected error messages exceeds a predetermined reference number of error messages. [5] System (25) according to one of the preceding claims, characterized bythat the server controller (33) is designed to determine whether the mobile work machine (1a) does not need to be equipped with a second retrofit component if the number of detected error messages corresponds to a predetermined reference number of error messages. [6] System (25) according to one of the preceding claims, characterized by in that the server controller (33) is designed to transmit a retrofit notification to an external communication device (29) via the server communication interface (31) and the communication network (23), in particular to transmit it when the number of detected error messages exceeds the predetermined reference number of error messages, in order to prompt a service technician to install the second retrofit component in the mobile work machine (1a). [7] System (25) according to one of the preceding claims, characterized bythat the controller (19) is designed to transmit the error message to the communication network (23) via the communication interface (21) if, after a further determination of a further operating parameter of the first component (16) by the determination device (18), the controller (19) determines on the basis of the detected further operating parameter whether a further error condition of the first component (16) exists. [8] System (25) according to one of the preceding claims, characterized by that the first component (16) of the mobile work machine (1a) comprises an electric traction battery (17), in particular a lithium-ion battery, and that the determination device (18) comprises a battery management system which is designed to determine a recuperation energy absorbable by the traction battery (17) as an operating parameter of the traction battery (17), wherein the controller (19) of the mobile work machine (1a) is designed to determine whether a fault condition of the electric traction battery (17) exists, wherein a fault condition of the traction battery (17) exists when the kinetic and / or potential energy of the mobile work machine (1a) or the load of the mobile work machine (1a) must be reduced to the recuperation energy of the traction battery (17), wherein the controller (19) is designed to transmit an error message to the communication network (23) via the communication interface (21) when the error condition of the first component (16) is present; and wherein the server controller (33) of the external server (27) is designed to determine, on the basis of the received error message, whether the mobile work machine (1a) needs to be equipped with an electrical braking resistor as a second retrofit component in order to avoid a reduction of the kinetic and / or potential energy of the mobile work machine (1a) to the recuperation energy of the traction battery (17). [9] System (25) according to claim 8, characterized by in that the controller (19) is designed to determine the recuperation energy that can be absorbed by the traction battery (17) as a function of at least one of the following parameters: temperature of the electric traction battery (17), state of charge of the traction battery (17), time period after the start of the mobile work machine (1a). [10] System (25) according to claim 8 or 9, characterized bythat the mobile work machine (1a) has an electric traction motor electrically connected to the electric traction battery (17) for driving the mobile work machine (1a), and that the controller (19) is designed to reduce an electrical power consumption of the electric traction motor when the fault condition of the electric traction battery (17) is present. [11] System (25) according to one of claims 8 to 10, characterized by in that the mobile work machine (1a) has a mechanical brake which is designed to reduce a travel speed of the mobile work machine (1a), and in that the controller (19) is designed to activate the mechanical brake when the fault condition of the electric traction battery (17) is present in order to reduce a travel speed of the mobile work machine (1a). [12] System (25) according to one of the preceding claims, characterized bythat the second retrofit component is not part of the mobile work machine (1a) at the time the controller (19) determines whether a fault condition of the first component (16) exists. [13] Method (50) for assessing the need to retrofit a mobile work machine (1a), in particular an industrial truck (1), with a second retrofit component in a system (25), wherein the system (25) comprises a mobile work machine (1a), in particular an industrial truck (1), and an external server (27), wherein the mobile work machine (1a) has a first component (16) and a determination device (18), wherein the mobile work machine (1a) has a controller (19), wherein the mobile work machine (1a) has a communication interface (21) which is connected to the controller (19) for control purposes and is connected to a communication network (23), wherein the external server (27) has a server communication interface (31) which is connected to the communication network (23), and wherein the external server (27) has a server controller (33), wherein the method (50) comprises the following method steps: Determining (51) an operating parameter of the first component (16) by the determining device (18), Determining (53) on the basis of the determined operating parameter whether a fault condition of the first component (16) exists by the controller (19), transmitting (55) an error message via the communication interface (21) to the communication network (23) when an error condition of the first component (16) is present by the controller (19), Receiving (57) an error message transmitted from the controller (19) of the mobile work machine (1a) to the communication network (23) by the server communication interface (31) of the external server (27), Determining (59) by the server controller (33) on the basis of the received error message whether the mobile work machine (1a) needs to be equipped with a second retrofit component in order to avoid the error condition of the first component (16). [14] Method (50) according to claim 13, characterized by that the system (25) comprises an external communication device (29), the method comprising the further method step: Transmitting a retrofit instruction to the external communication device (29) to instruct a service technician to install the second retrofit component in the mobile work machine (1a). [15] Method (50) according to claim 13 or 14, wherein the first component of the mobile work machine (1a) comprises an electric traction battery (17), in particular a lithium-ion battery, and that the determining device (18) comprises a battery management system, characterized by that the method (50) comprises the following steps: Determining the recuperation energy absorbable by the traction battery (17) as an operating parameter by the determining device (18), Determining whether a fault condition of the electric traction battery (17) exists, wherein a fault condition of the traction battery (17) exists when the kinetic and / or potential energy of the mobile work machine (1a) must be reduced to the recuperation energy of the traction battery (17), by the controller (19), transmitting an error message via the communication interface (21) to the communication network (23) when an error condition of the first component (16) is present by the controller (19), Receiving the error message transmitted from the controller (19) of the mobile work machine (1a) to the communication network (23) by the server communication interface (31) of the external server (27), Determining by the server controller (33) on the basis of the received error message whether the mobile work machine (1a) must be equipped with an electrical braking resistor as a second retrofit component in order to avoid a reduction of the kinetic and / or potential energy of the mobile work machine (1a) to the recuperation energy of the traction battery (17).

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