Method for operating a cleaning device and cleaning device

Abstract

A method is described for operating a cleaning device (100) having a pump drive (145) and a pump unit (140) coupled to the pump drive (145) for conveying cleaning fluid through the cleaning device (100), wherein the method comprises a step of outputting an operating signal to an interface to the pump drive (145) in order to set the pump unit (140) in an operating movement for a device program to be executed, a step of providing a control signal to the interface to the pump drive (145) in order to control a counter-movement of the pump unit (140) opposite to the operating movement, a step of determining a current device parameter of a current operating state required for the counter-movement, and a step of detecting a fluid quantity that is too small for the execution of the device program if the current device parameter is equal to or less than a limit value.

Description

[0001] The invention relates to a cleaning device and a method for operating a cleaning device.

[0002] DE 10 2016 102 460 B4 describes an approach in which a pump of a household appliance is used as a sensor for releasing a heating device of the household appliance.

[0003] The approach presented here aims to create an improved method for operating a cleaning device and an improved cleaning device.

[0004] According to the invention, this object is achieved by a method for operating a cleaning device and a cleaning device having the features of the main claims. Advantageous embodiments and further developments of the invention are set forth in the following subclaims.

[0005] The proposed approach can create a way to extend the service life of a cleaning device and reduce the frequency of damage that may be caused, for example, by an insufficient water level in the device. Furthermore, customer satisfaction can be improved.

[0006] A method for operating a cleaning device having a pump drive and a pump unit coupled to the pump drive for conveying cleaning fluid through the cleaning device is presented, wherein the method comprises a step of outputting an operating signal to an interface to the pump drive in order to set the pump unit in an operating movement for a device program to be executed.Furthermore, the method comprises a step of providing a control signal to the interface to the pump drive in order to control a counter-movement of the pump unit opposite to the operating movement, a step of determining a current device parameter of a current operating state required for the counter-movement, for example a current electrical operating state required for the counter-movement, and a step of detecting a fluid quantity that is too small for the execution of the device program if the current device parameter is equal to or less than a limit value, for example a predetermined power, current or torque limit value.

[0007] The method can advantageously be used for a cleaning appliance, such as a dishwasher. Alternatively, the cleaning appliance can also be designed as a washing machine, so that the method can also be applied to other types of cleaning appliances. The pump drive and the pump unit can advantageously realize a rotary movement in two opposing directions. The pump unit or the pump drive is designed such that a change in the rotary movement in a counter-movement opposite to the operating movement has no influence on the conveying direction of the cleaning fluid through the pump unit (as is the case, for example, with pump impellers with a "radial component" (turbomachines with radial or semi-axial impellers)). The cleaning fluid can, for example, be a cleaning mixture or a cleaning solution that can be conveyed through the cleaning appliance for a device program.The device program can, for example, be a cleaning program. The operating movement of the pump unit can, for example, be clockwise. Furthermore, during the dispensing step, the cleaning fluid can be admitted into the cleaning device, and additionally or alternatively, the device program can, for example, be interrupted in response to a trigger criterion. Advantageously, the cleaning device can thereby be placed into a test mode, which can, for example, briefly interrupt the cleaning program once or multiple times. The countermovement can, for example, be controlled using a negative speed setpoint. The countermovement thus occurs in a direction opposite to the rotary movement; for example, the countermovement can occur counterclockwise.The device parameter can advantageously represent a power, an electric current, or a torque that may be required for the countermovement. For example, the determination step can be performed using control-engineered variables in the software of a frequency converter of the cleaning device.

[0008] According to one embodiment, the outputting step can be repeated if the current device parameter is greater than the limit value, in particular the predefined power, current, or torque limit value, in order to continue the device program. If the current device parameter is greater than the limit value, this can advantageously mean that an insufficient amount of fluid was not detected in the cleaning device. Furthermore, this means that the countermovement can advantageously be stopped and the pump unit can be (re)started in its operating motion.

[0009] The provision step can be executed when a trigger criterion is met, which is a time specification and additionally or alternatively an event in a program sequence of the cleaning program. Advantageously, the trigger criterion can occur repeatedly, for example in the form of the time specification "every five minutes." The time period mentioned here is merely an example. Advantageously, the functionality of the cleaning device can be continuously checked and potential errors can be detected in good time before damage can occur. The event as a trigger criterion can, for example, be the introduction of the cleaning fluid into a fluid circuit, after pumping out and additionally or alternatively after partial pumping out.Furthermore, after sensing an unexpected operating state of the pump unit (such as a so-called "slurping") during regular operation with the help of existing detection algorithms and additionally or alternatively after sensing insufficient electrical power or current consumption of the pump in clockwise rotation, i.e. during operating movement.

[0010] Furthermore, in the providing step, the control signal can be provided to stop the operating movement and, additionally or alternatively, to control the counter-movement of the pump unit using a negative speed setpoint. Advantageously, a negative setpoint speed can be controlled or achieved, at which the device parameter can be detected. Advantageously, a meaningful result can be obtained that can allow a conclusion to be drawn about the available fluid quantity.

[0011] According to one embodiment, in the step of outputting the operating signal and additionally or alternatively in the step of providing the control signal, the operating signal and additionally or alternatively the control signal can be output to the pump drive, which, at the same speed, can deliver a larger amount of fluid in the operating movement than in the counter-movement. This means that, for example, the different power or current consumption can be achieved if the impeller has an asymmetrical delivery rate with respect to the direction of rotation.

[0012] Furthermore, in the detection step, an information signal can be outputted, which can represent the insufficient amount of fluid. The information signal can represent a warning message and additionally or alternatively an error message. Advantageously, the information signal can be outputted to an interface to a display unit, for example, to alert a user to the low amount of fluid. Additionally or alternatively, the information signal can be used to store the corresponding warning or error message, for example, in a memory unit of the cleaning device, so that a specialist can repair or rectify the corresponding error, for example, during repair or maintenance of the device.

[0013] During the detection step, the information signal can be transmitted wirelessly. Advantageously, the information signal can be transmitted to a smartphone or tablet, for example, and a corresponding warning or error message can be displayed to the user on the device via an application.

[0014] In addition, an action signal representing a detected insufficient amount of fluid can be output during the detection step. This action signal can be configured to trigger the re-pumping of fluid and, additionally or alternatively, the deactivation of a heating device of the cleaning device for a further program run of the device program. By re-pumping, as much cleaning fluid as necessary for the correspondingly selected device program can be refilled.

[0015] The approach presented here further provides a control unit configured to perform, control, or implement the steps of a variant of a method presented here in corresponding devices. This embodiment of the invention in the form of a device also allows the problem underlying the invention to be solved quickly and efficiently.

[0016] The control unit can be designed to read in input signals and to determine and provide output signals using the input signals. An input signal can, for example, represent a sensor signal that can be read in via an input interface of the control unit. An output signal can represent a control signal or a data signal that can be provided at an output interface of the control unit. The control unit can be designed to determine the output signals using a processing rule implemented in hardware or software. For example, the control unit can comprise a logic circuit, an integrated circuit, or a software module and can, for example, be implemented as a discrete component or be comprised of a discrete component.

[0017] Furthermore, a cleaning device is presented which has a pump unit for conveying a cleaning fluid through the cleaning device, a pump drive for driving the pump unit, wherein the pump drive is electrically coupled to the pump unit, and a control unit in a previously mentioned variant, wherein the control unit is electrically coupled to the pump drive.

[0018] The cleaning device can advantageously be designed as a standard dishwasher, which can be used as a household appliance or alternatively in conjunction with a commercial or professional device.

[0019] According to one embodiment, the pump unit can be designed as a circulation pump.

[0020] Also advantageous is a computer program product or computer program with program code that can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory, or an optical memory. If the program product or program is executed on a computer or a control unit, the program product or program can be used to carry out, implement, and / or control the steps of the method according to one of the embodiments described here.

[0021] An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows Fig. 1 a schematic representation of an embodiment of a cleaning device; Fig. 2 a flowchart of an embodiment of a method for operating a cleaning device; Fig. 3 is a flowchart of an embodiment of a method for operating a cleaning device; and Fig. 4 a block diagram of an embodiment of a control unit.

[0022] Fig. 1 shows a schematic representation of an embodiment of a cleaning appliance 100, which can be implemented, for example, as a dishwasher or alternatively as a washing machine. The cleaning appliance 100 is designed to clean items to be cleaned, for example, dishes and / or cutlery, in a cleaning chamber 105. For example, the items to be cleaned are placed into a plurality of receiving baskets arranged one above the other, and the receiving baskets are pushed into the cleaning chamber 105. In order to satisfactorily clean the items to be cleaned, the cleaning appliance 100 has a plurality of spray arms 110, 115, 120, which are arranged above or below the receiving baskets and are integrated into a fluid circuit 125 of the cleaning appliance 100 for cleaning fluids required for a cleaning process.The fluid circuit 125 comprises, for example, a plurality of fluid lines 130, such as hoses, as well as a collecting container 135 for collecting the cleaning solution. This means that the cleaning fluid is introduced into the cleaning chamber 105 via the spray arms 110, 115, 120.

[0023] In order to introduce the cleaning fluid for at least one device program of the cleaning device 100, the cleaning device 100 has a pump unit 140. The pump unit 140 is designed to convey the cleaning fluid through the fluid circuit 125. For example, the pump unit 140 is embodied as a circulation pump. The cleaning device 100 further has a pump drive 145, which is designed to drive the pump unit 140 and is therefore mechanically coupled to the pump unit 140. The cleaning device 100 further has a control unit 150, which is electrically coupled to the pump drive 145. The control unit 150 is, for example, coupled to an operating and / or display device of the cleaning device 100 or integrated into such a device and is designed to control and / or execute a method for operating the cleaning device 100, as described in at least one of the following figures.

[0024] Fig. 2 shows a flowchart of an embodiment of a method 200 for operating a cleaning device, as described, for example, in Fig. 1 was described.

[0025] The method 200 comprises a step 205 of outputting an operating signal to an interface to the pump drive in order to set the pump unit in an operating movement, for example, in a clockwise direction, for a device program to be executed. This optionally only allows a cleaning fluid to be admitted into the fluid circuit. Further optionally, a test mode of the cleaning device is triggered in response to a triggering criterion. The method 200 thus comprises a step 210 of providing a control signal to the interface to the pump drive in order to control a countermovement of the pump unit opposite to the operating movement. The countermovement is, for example, counterclockwise and is controlled, for example, using a negative speed setpoint specification.In a determination step 215, a current device parameter, such as a power, an electric current, or a torque, of a current electrical operating state required for the countermovement is determined. This is done, for example, using control-related variables in a software of the frequency converter of the cleaning device. Finally, in a detection step 220, a fluid quantity that is too small for the execution of the device program is detected if the current device parameter is equal to or less than the limit value, for example, the power limit value. Conversely, this means that a fluid quantity is sufficient for the device program if the current device parameter is greater than the limit value, for example, the power limit value.

[0026] According to one embodiment, step 205 of outputting is repeated if the current device parameter is greater than the limit value, e.g. the power limit value, in order to continue the device program. For example, the counter-movement is stopped and the pump unit is put into operation again. The repetition of step 205 and / or the further steps 210, 215, 220 of the method 200 takes place, for example, as a status query in order to protect the cleaning device from potential damage. According to this embodiment, step 210 of making available is carried out when a trigger criterion is reached, which is, for example, a time specification, such as "every 5 minutes", and / or an event in a program sequence of the cleaning program. This means that the pump drive is switched on after water has been admitted, after pumping out, after partial pumping out, after an unexpected operating state of the pump has been detected (e.g. a so-called"Slurping") during regular operation, using existing detection algorithms and / or after detecting insufficient electrical current or power consumption of the pump, the pump is controlled in clockwise rotation. For example, the operating movement is stopped and / or the counter-movement of the pump unit is controlled using a negative speed setpoint.

[0027] Further optionally, for example, in step 205 of outputting the operating signal and / or in step 210 of providing the control signal, the operating signal and / or the control signal is output to the pump drive, which, at the same speed, delivers a larger amount of fluid in the operating movement than in the counter-movement. This results in the different current or power consumption, for example, if the pump impeller has an asymmetrical delivery rate with respect to the direction of rotation.

[0028] According to this exemplary embodiment, in step 220 of detection, an information signal is outputted that represents the insufficient amount of fluid, wherein the information signal represents a warning message and / or an error message. This also optionally occurs wirelessly, for example, to a mobile device or to a cloud. The information signal informs a user about the current status of the cleaning device or whether there is sufficient cleaning fluid in the fluid circuit for a selected device program. Furthermore, it is optionally possible to output an action signal in step 220 of detection that represents a detected insufficient amount of fluid, which action signal is designed to trigger a further pumping of fluid, for example so that the amount of fluid is sufficient for the device program, and / or a switching off of a heating device of the cleaning device for a further program run.By switching off the heating device, unnecessary switching cycles of the heating as well as overheating of the device or individual components are avoided.

[0029] Fig. 3 shows a flowchart of an embodiment of a method 300 for operating a cleaning device, as described, for example, in Fig. 1. The method 300 described here is similar, for example, to that described in Fig. 2 and is merely presented in more detail.

[0030] In a block 301, a program for the cleaning device is started. After the program has started, a water inlet is initiated by a block 305. This means that cleaning fluid is introduced into the fluid circuit before a block 310 interrupts the device program and senses the flushing medium. This means that the device program is interrupted by stopping the circulation pump in a block 315. Subsequently, a block 320 initiates the measurement. This means that a counterclockwise rotation of the circulation pump is initiated by assigning a negative speed setpoint, for example, 3500 revolutions per minute (rpm). Furthermore, a value "Electrical power consumption of the circulation pump - P" is queried in a block 325. el" from a frequency converter of the pump drive 145 of the cleaning device, for example via a data bus. Based on this, a decision block 330 checks whether the requested power P el is greater than a predefined limit, such as 40 watts. If this is not the case, a conclusion is drawn in block 335 that the amount of fluid flowing through the fluid circuit is too small for the device program. If, however, the power is greater than 40 watts, a conclusion is drawn in block 340 that a sufficient amount of fluid is available to continue the device program, and the continuation is initiated by block 345.

[0031] For example, from then on, block 310 is activated again during the device program, causing another interruption of the device program. This occurs repeatedly at regular intervals, for example, to detect a lack of rinsing medium in a timely manner and prevent damage to the cleaning device, for example, due to overheating.

[0032] In other words, a lack of or insufficient rinsing medium can be detected by rotating the dishwasher circulation pump counterclockwise, or such a case can be detected more reliably and at an earlier stage.

[0033] During normal pumping operation, a difference between pumping "normal water" (hereinafter also referred to as "4 liters") versus "too little water" (hereinafter also referred to as "residual water" or "RW") can be lost within the tolerances of a standard mechanical seal. However, this can be avoided by operating the 140 pump in the opposite direction to its intended flow direction. An example of this with measured values is described below:

[0034] The following equations describe, depending on the direction of rotation "clockwise" and "counterclockwise", the difference in electrical power consumption of the pump drive 145 of the cleaning device between operation with water ("normal water" or "4 liters") and without water ("too little water" or "residual water" or "RW"):

[0035] At 3,500 rpm clockwise rotation: ΔP_(el,3k5,R)=P_(el,4liter,3k5,R)−P_(el,RW,3k5,R)=31.3W−9.4W=+21.9W

[0036] At 3,500 rpm counterclockwise rotation: ΔP_(el,3k5,L)=P_(el,4liter,3k5,L)−P_(el,RW,3k5,L)=50.6 W−15.7 W=+34.9W

[0037] At 4,500 rpm clockwise rotation: ΔP_(el,4k5,R)=P_(el,4liter,4k5,R)−P_(el,RW,4k5,R)=60.0 W−12.6 W=+47.4W

[0038] Furthermore, a stiff mechanical seal (sGRD) generates an additional friction torque: ΔM_sGRD=+0.05Nm

[0039] From this, the increase in frictional power of a stiff mechanical seal (sGRD) compared to a “normal” mechanical seal (GRD) at 3,500 rpm and at 4,500 rpm can be calculated: ΔP_(sGRD,3k5)=2*π*M*n=2*π*0.05Nm*(3500min / 60s*min)=+18.3W ΔP_(sGRD,4k5)=2*π*M*n=2*π*0.05Nm*(4500min / 60s*min)=+23.6 W

[0040] The difference in electrical power consumption of the pump drive 145 between the operation of the pump 140 with water (4 liters) and without water (residual water RW) at a speed of 3,500 rpm in its actual conveying direction is of the same order of magnitude as the difference in electrical power consumption of the pump drive 145 between a stiff mechanical seal (sGRD) and a "normal" mechanical seal (GRD): ΔP_(el,3k5,R)=+21.9W ΔP_(sGRD,3k5)=+18.3W

[0041] A “reliable” differentiation of the operating state of the pump is not guaranteed, since the tolerances of the mechanical seal can “mask” the distinguishing feature.

[0042] There are two options for “safe” differentiation between operation with water (“normal water” or “4 liters”) and without water (“too little water” or “residual water” or “RW”): A: Increase the speed, or B: Controlling the pump unit (140) in a counter movement opposite to the operating movement.

[0043] Solution A: Increase the speed to, for example, 4,500 rpm: ΔP_(el,4k5,R)=+47.4W ΔP_(sGRD,4k5,R)=+23.6 W

[0044] A "reliable" differentiation of the operating state of the pump is thus ensured, since the magnitude of the differences in the electrical power consumption of the pump drive 145 differs significantly between the operation of the pump 140 with water (4 liters) and without water (residual water RW) and a stiff mechanical seal (sGRD).

[0045] However, there are potential disadvantages to increasing the speed. These include: - Increased wear of the seal - Acoustic abnormalities

[0046] Solution B: To avoid the disadvantages of solution A, the pump unit (140) is controlled at a speed of 3,500 rpm in a counter-movement opposite to the operating movement: ΔP_(el,3k5,L)=+34.9.9W ΔP_(sGRD,3k5)=+18.3W

[0047] A "safe" differentiation of the operating state of the pump between operation with water ("normal water" or "4 liters") and without water ("too little water" or "residual water" or "RW") is thus ensured, since the magnitudes of the differences in the electrical power consumption of the pump drive 145 differ between the operation of the pump 140 with water (4 liters) and without water (residual water RW) and a stiff mechanical seal (sGRD).

[0048] In the method according to the invention (solution B), the counterclockwise rotation of the pump, i.e., the pump unit, and the associated poorer pump efficiency result in a significantly greater difference in the electrical power consumption of the pump drive 145 between dry running of the pump, i.e., operation with too little water or operation with residual water, and operation with the medium than is the case with clockwise rotation (normal operation). According to the invention, this allows for a brief counterclockwise rotation to be used to detect the presence of the medium with sufficient accuracy and, for example, to distinguish it from a stiff mechanical seal (sGRD).

[0049] For this purpose, an intelligent control system detects low water levels and prevents consequential damage and customer downtime with warranty services.

[0050] The sensing of the presence of the washing medium described here requires an interruption of the normal program sequence due to the anti-clockwise rotation of the circulation pump, which is carried out, for example, in clockwise rotation. The sensing of the presence of the washing medium interrupts and / or starts the normal program sequence according to the following criteria, for example after a defined period (time-controlled), for example every 5 minutes, alternatively or additionally also after certain events in the program sequence, such as after water has been added, after draining, after partial draining, after sensing an unexpected operating state of the circulation pump (such as "slurping") during regular operation with the help of corresponding detection algorithms that are standard in the dishwasher and / or after sensing insufficient electrical current or power consumption of the circulation pump during regular operation, e.g.using existing control parameters in the control software of the frequency converter.

[0051] The detection of a water level that is too low for the regular program sequence can result in the program sequence being interrupted and a warning or error message being displayed, such as "Attention, check drain! Is the drain vented and vented?", that water is refilled, that an error counter for unintentional emptying of the machine is incremented, whereby information is provided to a customer or customer service, and / or that the program continues to run without switching on the heater in order to avoid unnecessary switching cycles of the heater, which can occur due to frequent switching back and forth, for example of the heater pressure switch.

[0052] A generated value for sensing the presence of flushing medium in counterclockwise rotation is generated purely by way of example using the electrical power consumption of the pump drive motor. For example, a value can be derived from existing control-related variables in the control software of the frequency converter, e.g., electrical current, electrical torque as a possible manipulated variable of a speed controller, and transmitted, for example, via a data bus to the machine control system, so that the control unit can then decide whether flushing medium is present. Alternatively, a torque of the pump drive motor can be used. In this case, a respective torque-generating component of the electrical current of the field-oriented control of the pump drive motor from the control software of the frequency converter is used.

[0053] Key components for sensing include special pump features that make the hydraulic efficiency dependent on the direction of rotation. Such features include forward-curved impeller blades and / or tangential discharge nozzles. Possible disturbances that complicate sensing include relatively high and fluctuating sliding friction in the sealing system and changes in the device's hydraulic system, such as a change in the hydraulic characteristic curve. For example, counterclockwise rotation with reduced hydraulic efficiency can at least partially compensate for these disturbances, allowing the determination of whether sufficient flushing medium is available.

[0054] Fig. 4 shows a block diagram of an embodiment of a control unit 150, as shown for example in Fig. 1. The control unit 150 is designed, for example, to control and / or carry out a method for operating a cleaning device, as described, for example, in at least one of the Fig. 2 to 3. The control unit 150 has an output unit 400, a provision unit 405, a determination unit 410, and a recognition unit 415.

[0055] The output unit 400 is configured to output an operating signal 420 to an interface to the pump drive 145 in order to set the pump unit in an operating movement for a device program to be executed. The provision unit 405 is configured to provide a control signal 425 to the interface to the pump drive in order to control a countermovement of the pump unit that is opposite to the operating movement. The determination unit 410 is configured to determine a current device parameter 430 of a current electrical operating state required for the countermovement. The detection unit 415 is configured to detect a fluid quantity that is too small for the execution of the device program if the current device parameter 430 is equal to or less than a limit value, e.g., a power limit value, 435.Furthermore, the detection unit 415 is optionally configured to output an information signal 440 representing the insufficient fluid quantity, wherein the information signal 440 represents a warning message and / or an error message. Additionally or alternatively, the detection unit 415 is configured to output an action signal 445 representing a detected insufficient fluid quantity, which is configured to trigger the re-pumping of a fluid and / or the deactivation of a heating device of the cleaning device for a further program run. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2016 102 460 B4

[0002]

Claims

[1] Method (200) for operating a cleaning device (100) with a pump drive (145) and a pump unit (140) coupled to the pump drive (145) for conveying cleaning fluid through the cleaning device (100), the method (200) comprising the following steps: - outputting (205) an operating signal (420) to an interface to the pump drive (145) in order to set the pump unit (140) into an operating movement for a device program to be executed; - Providing (210) a control signal (425) to the interface to the pump drive (145) in order to control a counter-movement of the pump unit (140) opposite to the operating movement; - determining (215) a current device parameter (430) of a current operating state required for the counter movement; and - Detecting (220) a fluid quantity that is too small for the execution of the device program if the current device parameter (430) is equal to or less than a limit value (435). [2] The method (200) of claim 1, wherein the step (205) of outputting is repeated if the current device parameter (430) is greater than the threshold value (430) to continue the device program. [3] Method (200) according to one of the preceding claims, wherein the step (405) of providing is carried out when a trigger criterion is reached, which is a time specification and / or an event in a program sequence of the cleaning program. [4] Method (200) according to one of the preceding claims, wherein in the step (405) of providing, the control signal (425) is provided in order to stop the operating movement and / or to control the counter-movement of the pump unit (140) using a negative speed setpoint specification. [5] Method (200) according to one of the preceding claims, wherein in the step (205) of outputting the operating signal (420) and / or in the step (210) of providing the control signal (425), the operating signal (420) and / or the control signal (425) is output to the pump drive (145) which, at the same speed, delivers a larger amount of fluid in the operating movement than in the counter movement. [6] Method (200) according to one of the preceding claims, wherein in the step (220) of detection an information signal (440) is output which represents the insufficient amount of fluid, wherein the information signal (440) represents a warning message and / or an error message. [7] The method (200) of claim 6, wherein in the step (220) of detecting, the information signal (440) is output wirelessly. [8] Method (200) according to one of the preceding claims, wherein in the step (220) of detection, an action signal (445) representing a detected insufficient amount of fluid is output, which is designed to control a further pumping of a fluid and / or a switching off of a heating device of the cleaning device (100) for a further program sequence of the device program. [9] Control unit (150) which is designed to carry out and / or control the steps (205, 210, 215, 220) of the method (200) according to one of the preceding claims in corresponding units (400, 405, 410, 415). [10] Computer program product with program code for carrying out the method (200) according to one of claims 1 to 8, when the computer program product is executed on a control unit (150) according to claim 9. [11] Cleaning device (100) having the following features: - a pump unit (140) for conveying a cleaning fluid through the cleaning device (100); - a pump drive (145) for driving the pump unit (140), wherein the pump drive (145) is electrically coupled to the pump unit (140); and - a control unit (150) according to claim 9, wherein the control unit (150) is electrically coupled to the pump drive (145). [12] Cleaning device (100) according to claim 11, wherein the pump unit (140) is formed as a circulation pump.

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