Control device for a dishwasher with several consecutive work zones and / or work processes for cleaning dishes

Abstract

Control device for a dishwasher (1), wherein the control device is designed and configured to carry out a method for operating a dishwasher (1) with a plurality of successive work zones and / or work processes for cleaning washware, the method comprising: Detecting at least one error signal (f01, f02, f03), Determining a machine state (m1, m2, m3) based on the at least one error signal (f01, f02, f03), Initiating at least one reaction associated with the machine state (m1, m2, m3), wherein the machine state is determined on the basis of the at least one error signal (f01, f02, f03) as a normal state, a first error state with unimpaired hygiene result, a second error state with impaired hygiene result, a third error state with at least one failed work zone and / or with at least one omitted work process and / or a fourth error state with interruption of the operation of the dishwasher (1).

Description

[0001] The present invention relates to a control device for a dishwasher and a dishwasher. The invention also relates to a control device for a dishwasher and a dishwasher, which is designed and configured to carry out a method for operating a dishwasher. background

[0002] In the catering industry, there are dishwashers that can handle very high wash volumes. Dishwashers of this type are often designed as conveyor dishwashers, for example, with rotating conveyor belts or basket transport devices that transport the wash ware through wash lines consisting of several consecutive wash or general work zones. Different work processes can be carried out in the different work zones. This type of dishwasher can be referred to as a multi-tank conveyor dishwasher. Such conveyor dishwashers are described, for example, in DE 198 05 066 A1, DE 42 41 064 A1, DE 10 2007 016 331 A1, or DE 10 2014 114 719 A1. If a multi-tank conveyor dishwasher fails completely, the operator can incur considerable costs due to additional effort, service, and spare parts.

[0003] If the dishwasher described in US 2019 290 096 A1 detects an impending flood using a sensor on the edge of a drip pan, the drain rate is significantly increased to remedy the situation. The dishwasher continues to operate otherwise. An emergency shutdown is only initiated if this troubleshooting measure is ineffective. This dishwasher cannot address problems other than impending flooding.

[0004] If a component essential to the washing process fails in a conventional dishwasher, the washing process is stopped. Otherwise, there is a risk that faulty components will cause subsequent damage to other components of the machine.

[0005] Commercial dishwasher users want to maintain dishwashing operations for as long and as effectively as possible, even in the event of critical component failure. This ensures that a dishwasher doesn't suddenly fail during a large gathering, disrupting operations, but can continue to be used for the duration of the event or until a service technician arrives. Brief description of the invention

[0006] This object is achieved by a control device for a dishwasher, wherein the control device is designed and configured to carry out a method for operating a dishwasher.

[0007] The invention relates to a control device for a, preferably commercial, dishwasher, which is designed and configured to carry out the method as described below. Furthermore, the invention also relates to a, preferably commercial, dishwasher with multiple consecutive work zones and / or multiple consecutive work processes for cleaning washware, wherein the dishwasher is designed and configured to carry out the method as described above. The dishwasher can be implemented in particular as a conveyor dishwasher, preferably as a flight-type dishwasher or as a rack-type dishwasher.

[0008] This provides a method for operating a, preferably commercial, dishwasher with several consecutive work zones and / or several consecutive work processes for cleaning washware. The successive work zones can, for example, be arranged in series one behind the other. In particular, the successive work zones can follow one another directly in a transport direction. The successive work processes can, for example, run sequentially. Work processes can follow one another without interruption or can take place separately from one another by process pauses. Alternatively, work processes can follow one another with a temporal overlap, i.e. a later work process can begin before the completion of a previous work process.

[0009] The method for operating a dishwasher comprises the steps of detecting at least one error signal, determining a machine state based on the at least one error signal, and initiating at least one reaction associated with the machine state.

[0010] An error signal can be detected, in particular, if at least one sensor and / or at least one electronic unit, such as a diagnostic device, emits a signal indicating a malfunction of the dishwasher or one of its components. An error signal can preferably be in the form of a binary signal, whereby a binary 0 can indicate the presence of a normal state and a binary 1 the presence of an error, or vice versa. Alternatively or additionally, it is conceivable for an error signal to be detected when a predetermined sequence of events occurs within a predetermined time frame, for example if a run or trend is detected by means of at least one sensor, or if its rate of change is recorded that is faster or slower than a predetermined reference rate of change. The detection of an error signal can comprise a check to determine whether one or more conditions are met.Such conditions can, for example, relate to an operating state of the dishwasher and / or to variables detected by sensors of the dishwasher. In particular, a predetermined set of conditions can be assigned to each of several error signals, preferably uniquely. If the conditions assigned to a predetermined error signal are met, the corresponding error signal can be generated and / or detected.A predetermined error signal can be detected, for example, when several conditions are present, wherein a first condition can relate to the presence of a first sensor signal from a first sensor deviating from a predetermined target value, a second condition can relate to the simultaneous presence of a second sensor signal from a second sensor deviating from a predetermined tolerance range and, if appropriate, a third condition can relate to the fact that the first and the second condition exist during a predetermined operating state.

[0011] A machine state can be determined based on a single error signal or, preferably, based on multiple error signals. The machine state can be determined, for example, by analyzing the present error signal(s) in an error-processing system based on predetermined error criteria. The error-processing system can be referred to as an intelligent error management system. The error-processing system can, in particular, compare the current error signals with predetermined error criteria of the predefined machine states (failure states). To determine the machine state, multiple machine states can be predefined, each of which is associated with at least one error criterion, in particular multiple error criteria. For example, at least one error criterion can be assigned to a predetermined machine state using a lookup table.The machine state determined, in particular assumed, in the method is determined in particular as a result of the occurrence of a preconfigured combination of several of the error signals. The machine state can be determined under the condition that the at least one detected error signal corresponds to the at least one error criterion associated with this predetermined machine state. If several machine states are determined as a result of the detection of a plurality of error signals, one of the machine states, in particular the most critical machine states, can be determined, for example, based on a predetermined prioritization of the several predetermined machine states.

[0012] The at least one reaction, which is initiated because it is associated with the specific machine state, is preferably such that the dishwashing operation is maintained for as long and as effectively as possible. In the case of a fault-free machine state, the dishwasher is operated normally (normal operation). In particular, an error output derived from the at least one detected error signal can be provided as a reaction. For example, it can be provided that a predetermined error code, which is associated with an error signal or an error class related to determining the machine state, is output on a display unit and / or other communication interface of the dishwasher.Based on the machine status, it may, for example, be determined that only an error message should be generated, archived, and / or sent in response, with the dishwasher otherwise preferably continuing to operate unchanged, in particular normally. Individual non-critical error signals alone may not initiate a machine failure state as long as all conditions for flawless and hygienic dishwashing operation continue to be met. Optionally, it may be determined that, in response to the specific machine status, modified dishwashing operation should continue. Modified dishwashing operation occurs with control parameters that deviate from normal operation. Alternatively, the specific machine status may determine that dishwashing operation cannot be maintained and the dishwasher is deactivated.

[0013] According to one embodiment of the method, initiating the reaction comprises switching off at least one of the work zones. Alternatively or additionally, initiating the reaction comprises omitting at least one of the work processes. In this case, the detected error signal can preferably indicate an operating error of the dishwasher in the at least one work zone that has been switched off and / or in the at least one work process that has been switched off. For example, in a dishwasher that has several similar work zones or work processes, one of these similar work zones or processes can be omitted if a machine state occurs in which this work zone or this work process is affected by a failure. For example, a work zone can be affected by an electrical short circuit that otherwise does not affect the dishwasher.By shutting down a work zone and / or skipping a work process, the dishwasher can continue to operate in a modified manner. By shutting down faulty components that affect only one work zone and / or one work process early on, it is possible to prevent subsequent damage to other components of the machine. Even work zones or work processes that are fundamentally necessary for proper and hygienic dishwashing results can be shut down or skipped. In this case, it may be useful to generate and, if possible, issue a corresponding error signal or warning signal. In some situations, this can at least achieve limited dishwasher operation rather than a total failure.

[0014] Preferably, an embodiment of the method, which can be combined with the previous one, comprises determining the machine state, wherein an error class is defined based on the at least one error signal, and a machine state corresponding to this error class is selected. Additionally or alternatively, determining the machine state can comprise determining a degree of dishwasher failure. Preferably, the degree of failure is described by the predetermined error classes. In particular, a predetermined combination of error signals can each be uniquely assigned to several error classes. Preferably, when the error signals assigned to a predetermined error class are detected and present in combination, the corresponding error class can be selected.In particular, several, in particular at least 2 or 3 and no more than 5 or 10, different, preferably exactly two, exactly three or exactly four, different error classes can be defined. A first error class can be assigned to a machine state without failure (e.g., "error class 0"). A second error class can be assigned to a machine state corresponding to a total failure of the machine (e.g., "error class IV"). At least one error class can be assigned to a machine state corresponding to a partial failure of the dishwasher ("error class I", "error class II", and / or "error class III"). If, when an error class corresponding to a partial failure occurs, the partial failure cannot be compensated for, or there is a risk that the machine will sustain further damage, a transition to the higher or highest error class can occur.The definition of the multiple error classes, the assignment of error signals to error classes, and / or the function for determining a machine status based on an error class can be stored in a non-volatile memory of an electronic unit, such as a central multi-tank conveyor dishwasher control system. It has been shown that by classifying operating states into error classes, a hygienic wash result can be maintained for as long as possible, even in the event of errors.

[0015] According to a preferred embodiment of the method, which can be combined with the preceding ones, determining the machine status comprises a check, in particular with regard to the degree of achievement of a sufficiently hygienic washing result. Determining the machine status can preferably comprise a first check to determine whether the items to be washed in the dishwasher are exposed to a detergent-containing washing liquid for at least a predetermined minimum cleaning period. Additionally or alternatively, determining the machine status can comprise a second check to determine whether at least a predetermined minimum amount of detergent is added to the washing liquid for applying it to the items to be washed.The full achievement of a hygienic washing result can be assumed, in particular, if the component or components of the dishwasher designed and configured to introduce liquid and / or solid detergent operate flawlessly, and if the dwell time of the washware in the work zone or zones in which the washware is exposed to washing liquid mixed with detergent corresponds at least to a predetermined minimum cleaning period (minimum contact time). The minimum cleaning period can be at least 30 seconds, in particular at least 1 minute or at least 2 minutes.

[0016] In some embodiments of the method, the machine state is determined on the basis of the at least one error signal as a normal state, a first error state with unimpaired hygiene result (which can be assigned to error class I, for example), a second error state with impaired hygiene result (which can be assigned to error class II, for example), a third error state with at least one failed work zone (which can be assigned to error class III, for example) and / or with at least one omitted work process (which can be assigned to error class III, for example) and / or a fourth error state with interruption of the operation of the dishwasher (which can be assigned to error class IV, for example).

[0017] The method preferably comprises operating a transport device for successively conveying washware through the plurality of work zones. The transport device can be operated at a first conveying speed, in particular in a normal state of the dishwasher. According to a preferred development, the method comprises operating the transport device such that the transport device can be operated at a second conveying speed that is lower than the first conveying speed in the first error state, the second error state and / or the third error state. It can be expedient if a second or further conveying speed is determined as a function of at least one sensor signal, at least one error signal, at least one error class and / or at least one machine state. The conveying speed can be constant.It is conceivable that the conveying speed describes a mean or average speed of the transport device, in particular with intermittent movement along the washing line through the dishwasher. The conveying speed of the transport device can be continuously adjustable, for example using a frequency converter-controlled motor. It may be particularly preferred if the first, second or further conveying speed is set such that a predetermined minimum cleaning period is achieved. Thus, for example, a failure of a work zone, in particular a main wash zone, can be compensated for by the reduced speed ensuring that the wash items remain in the remaining zone(s) for a sufficiently long time.

[0018] In a preferred embodiment of the method, which can be combined with the previous ones, the detection of at least one error signal comprises the acquisition of sensor signals from a plurality of sensors and a comparison of at least one of the sensor signals with a corresponding target value, tolerance range, and / or threshold value. Optionally, numerous sensor signals from different sensors can each be compared with a corresponding target value, tolerance range, and / or threshold value. It may be expedient if the detection of at least one error signal additionally or alternatively comprises a comparison of at least one control signal for one of the plurality of actuators of the dishwasher with a target value, tolerance range, and / or threshold value. The at least one sensor signal and / or control signal can preferably be acquired continuously during operation of the dishwasher (in the active operating state).The detection of an error signal can include a plausibility check. To detect an error signal, a comparison can be carried out between a current actual value according to at least one sensor signal and / or at least one control signal for an actuator and a predetermined target value, in particular in an electronic unit of the dishwasher. With regard to at least one predetermined sensor and / or actuator, such as a fill level sensor, for example, of a tank for rinse aid, rinsing liquid, water and / or detergent, a development of the sensor signal or control signal over time can alternatively or additionally be analyzed. A plausibility check can, for example, be carried out with regard to a sensor signal that indicates the absence or presence of a rinse aid, detergent and / or detergent in solid form present in a receptacle.As part of the plausibility check, a sensor signal, in particular a digital one, can be continuously monitored.

[0019] The dishwasher can have at least one sensor from the list comprising a fill level sensor, a temperature sensor, a contact sensor, and an overtemperature switch. A fill level sensor can be implemented, for example, as a pressure transmitter. A contact sensor can be implemented, for example, as a reed switch. A contact sensor can be designed and configured, for example, to detect a closed or open position of a door. Alternatively, a contact sensor can be designed to detect the presence or absence of a component, such as a sieve or a container for cleaning agents in liquid or solid form. A temperature sensor can be implemented, for example, as a measuring resistor, for example a platinum measuring resistor, for example a PT1000. A temperature sensor can in particular be designed and configured to measure a temperature of washing liquid, in particular in a tank.An overtemperature switch can be implemented, for example, as a bimetallic switch. An overtemperature switch can, in particular, be assigned to a heat pump, a heat exchanger, or a radiator, such as a tank radiator. In a dishwasher with multiple work zones, the work zones can each have at least one work zone-specific sensor from the list comprising a fill level sensor, a temperature sensor, a contact sensor, and an overtemperature switch. For example, multiple work zones, such as wash zones, in particular main wash zones, of a dishwasher can each have at least one work zone-specific fill level sensor, temperature sensor, and / or overtemperature sensor. Preferably, a predetermined condition relating to a combination of multiple control and / or sensor signals is required for the detection of at least one error signal.It can be provided that an error signal is generated and detected when several control and / or sensor signals collectively fulfill a predetermined condition. An error signal can, in particular, be generated as a binary signal, with a binary 1 indicating the presence of an error defined by the conditions of the error signal and a binary 0 indicating the absence of the error defined by the conditions of the error signal, or vice versa.

[0020] According to a further development, the detection of sensor signals comprises detecting a fill level signal from a fill level sensor that measures a fill level in a tank, and detecting a temperature sensor signal from a temperature sensor that measures a temperature of a rinsing liquid, in particular in this tank. The sensors, which are in particular work zone-specific, can be assigned to a tank of the respective work zone. For example, an error signal relating to one of the work zones can be detected based on the sensor signals from a temperature sensor and a fill level sensor of one of the work zones, in particular a first rinsing zone.

[0021] A preferred development of the method, which can be combined with the previous one, comprises operating the dishwasher either in an active operating state, such as a filling operating state, a rinsing operating state and / or a draining operating state, or an inactive operating state, such as a switched-off operating state. In particular, the detection of the error signal requires the dishwasher to be operated in the active operating state. Alternatively or additionally, it can be provided that the at least one sensor signal is detected during an active operating state of the dishwasher, in particular continuously. An active operating state can comprise one or more work processes. A work process can be, for example, a filling process, a rinsing process or a draining process.In particular, a filling operating state can comprise one or more filling processes, a rinsing operating state can comprise one or more rinsing processes, and / or a draining operating state can comprise one or more draining processes. A check regarding the predetermined conditions for detecting at least one error signal can take place, in particular by means of an electronic unit, such as the control electronics, from the time the machine is switched on. A check regarding the predetermined conditions for detecting at least one error signal can be terminated if, after the end of operation, all actuators or all components of the dishwasher are in a switched-off state.

[0022] In some embodiments of the method, the detected error signal can indicate an operating error of the dishwasher in one of the work zones and / or in one of the work processes, and the reaction can cause a change in an operating parameter in another of the work zones and / or in another of the work processes. Preferably, the changed operating parameter causes a change in the achieved hygiene level of the washed items dispensed by the dishwasher.

[0023] Dishwashers designed for this purpose, hereinafter also referred to as dishwashers, are used in particular for washing dishes, glasses, cutlery, large rectangular trays, Euro-standard baskets, pots, or the like, as used, for example, in restaurants, butcher shops, bakeries, confectioneries, etc. Such dishwashers are characterized, without restriction of generality, by the fact that they are structurally designed to accommodate large quantities and / or large-sized items.

[0024] Dishwashers are typically designed as freestanding appliances, without restriction of generality, featuring a table-like frame on which the dishwasher body stands with one or more work zones located within it. Below the work zone(s), the frame may contain a machine housing for a pump, a water heater, and / or an electronic control unit.

[0025] Dishwashers typically have essentially cuboid-shaped wash chambers (wash zones) for accommodating large quantities and / or large-volume wash items. A wash chamber or zone can normally have a width of 500 mm to 1500 mm, for example around 680 mm, a depth of 400 mm to 1000 mm, for example around 610 mm, and a height of 300 mm to 1000 mm, for example around 640 or 800 mm. Dishwashers are typically loaded using one or more baskets, such as an appliance basket or a small parts basket, which hold the wash items. Flat or planar wash items, such as dishes, trays, baking sheets, pot lids, or the like, can be inserted upright into wash baskets with inserts. For example, a basket can have dimensions (width x depth) of 650 mm x 508 mm, 608 mm x 672 mm or 1260 mm x 695 mm.For loading dishes, a dishwasher usually has a loading opening, which can be closed by a door and which can also be referred to as a loading and unloading opening.

[0026] Advantages of the exemplary embodiments of the present invention thus include the ability to efficiently respond to errors during the operation of a dishwasher and / or to maintain a hygienic washing result for as long as possible, even in the event of errors. Thus, a dishwasher according to the present invention can be operated reliably and allows at least limited continued operation if necessary. Short description of the characters

[0027] The invention is described in more detail below with reference to the accompanying drawings, in which: Fig. 1 shows a dishwasher according to an embodiment of the present invention; Fig. 2 a flow diagram of the dishwasher according to Fig. 1 shows; Fig. 3 shows a dishwasher according to another embodiment of the present invention; Fig. 4 a flow diagram of the dishwasher according to Fig. 3 shows; Fig. 5 shows a schematic representation of an embodiment of a method for operating a dishwasher; and Fig. 6 shows another schematic representation of an embodiment of a method for operating a dishwasher.

[0028] Components shown in several figures have the same reference symbols. Detailed description

[0029] Fig. 1 shows a preferably commercial dishwasher 1 according to an embodiment of the present invention and Fig. 2 shows a flow diagram of the dishwasher. Fig. One dishwasher shown is a rack conveyor dishwasher and is an example for other dishwashers, such as flight conveyor dishwashers.

[0030] The Fig. 1 and Fig. The dishwasher 1 shown in Figure 2 has several consecutive work zones. The dishwasher 1 comprises an inlet zone 2, a pre-wash zone 3, a main wash zone 4, a neutral zone 10, and a final rinse zone 6. The dishwasher 1 has a transport device 11 for successively conveying washware through the several work zones. During normal operation, the transport device 11 is operated in one conveying direction, so that the washware is moved from left to right through the work zones, as shown in the illustrations.

[0031] Heavily soiled dishes are fed into the dishwasher 1 at its inlet. The inlet zone 2 can be arranged at the inlet of the dishwasher 1. Alternatively, the inlet zone can be arranged in another area of ​​the dishwasher (not shown). The inlet zone 2 comprises a pump, which can be referred to as a rinse pump 20. The rinse pump 20 is designed and configured to pump water into the dishwasher 1. In the filling or rinsing mode, the rinse pump 20 can be connected to one or more water sources, such as a fresh water inlet 26 and, if appropriate, an inlet 27 for second-quality water. The rinse pump 20 is equipped with a reservoir for the water from the water source(s). The reservoir preferably comprises a water mains separator 28.The water mains separator 28 is designed to prevent potentially contaminated water or water containing a detergent (washing liquid) from flowing back from the dishwasher 1 towards a water source. The reservoir, here the water mains separator 28, is a tank equipped with a fill level sensor 21. The fill level sensor 21 can be designed and configured to determine the quantity or level of water in the tank 28. In particular, the fill level sensor 21 can be designed and configured to detect which level is currently reached in a range between a lower fill limit, for example 0 mm, and an upper fill limit, for example 84 mm. Alternatively or additionally, a fill level sensor can be designed or configured to detect whether or not a predetermined minimum quantity or a minimum level in the reservoir has been reached.

[0032] Optionally, the dishwasher can have a rinse aid receptacle. The rinse aid receptacle can comprise a sensor for detecting the absence or presence or amount of rinse aid present in the receptacle, such as a rinse aid fill level sensor (rinse aid fill level sensor, not shown). The rinse aid fill level sensor can be arranged, for example, in the final rinse zone 6. The rinse aid fill level sensor can be designed and configured to determine the amount or level of rinse aid in a tank or container, in particular a rinse aid canister. In particular, the rinse aid fill level sensor can be designed or configured to detect whether or not a predetermined minimum amount or minimum level of rinse aid has been reached in the reservoir.The rinse aid fill level sensor can in particular be designed and configured to output a particularly digital sensor signal as a sensor signal that represents either a full state or an empty state.

[0033] The dishwasher 1 can have one or more strainer inserts. For example, a strainer insert can be provided at the inlet of the dishwasher, which can be designed to catch coarse dirt or cutlery. A strainer insert can be associated with a sensor, such as a drawer sensor 24, to detect the absence or presence of the strainer insert and / or its correct placement. The drawer sensor 24 can be implemented as a contact sensor.

[0034] The dishwasher 1 can, for example in the area of ​​the inlet zone 2 and / or the main wash zone 4, have at least one receptacle for cleaning agent in solid form or for a container with cleaning agent in solid form (solid dosing). Fig. In the embodiment shown in Figure 2, the inlet zone 2 is equipped with a receptacle for cleaning agent in solid form. The receptacle for cleaning agent can comprise a sensor for detecting the absence or presence or quantity of cleaning agent present in the receptacle, such as the contact sensor 22 shown here as an example. The contact sensor 22 can be designed and configured to detect whether a container is inserted into the receptacle. The receptacle can be operatively connected to a pump, such as the rinse pump 20, in order to generate a rinsing liquid for the dishwasher 1 from water from the reservoir and detergent from the receptacle. This rinsing liquid can be supplied to the main wash zone 4.

[0035] Pre-wash zone 3 is located following inlet zone 2 in the conveying direction. Alternatively, it is conceivable that the inlet zone is located directly at the inlet of the dishwasher (not shown). In pre-wash zone 3, the soiled dishes are wetted with water and / or rinsing liquid during the washing operation. In some dishwashers, pre-wash zone 3 may have a tank for rinsing liquid. Fig. Pre-wash zone 3 shown in Figure 2 does not have its own tank. The tank of a pre-wash zone may have a level sensor and / or a temperature sensor (in Fig. 2 (not shown). The rinsing liquid for wetting the dishes can be pumped from a tank in a main wash zone 4 or a tank in a final rinse zone 6.

[0036] Pre-wash zone 3 is followed in the conveying direction by main wash zone 4. Main wash zone 4 comprises a tank 40 for wash liquid. Tank 40 of main wash zone 4 has a fill level sensor 41 and a temperature sensor 43. During wash operation, at least one main wash pump pumps the wash liquid for cleaning the washware from tank 40 of main wash zone 4.

[0037] The main wash zone 4 is equipped with a receptacle, namely a detergent tank 48, for detergent in liquid form. The receptacle can be designed and configured to hold liquid detergent as a detergent tank or to hold a storage container fillable with detergent. The receptacle for liquid detergent can comprise a sensor to detect the absence or presence or quantity of detergent present in the receptacle, such as the fill level sensor 42 shown here as an example. The fill level sensor 42 can be designed and configured to detect the quantity or fill level of the liquid detergent present in this receptacle. The receptacle for liquid detergent can comprise a detergent pump to supply the detergent from the detergent tank to the main wash zone 4, in particular to pump it into its detergent tank.The rinse pump 20 can supply cold water, in particular, to the main rinse zone 4. The rinse pump 20 can pump rinse water into a pressure boiler, where it is heated before being transferred to the main rinse zone 4.

[0038] The dishwasher 1 can have one or more doors that allow lateral access to one or more work zones of the dishwasher. The main wash zone 4 has such a door. The door of the main wash zone 4 is equipped with a door contact sensor 45. The door contact sensor 45 can be designed to detect whether the door of the main wash zone 4 is in an open or closed position.

[0039] A neutral zone 10 can be provided adjacent to the main wash zone 4 in the conveying direction. The neutral zone 10 can be designed and configured as a separation between the main wash zone 4 and the subsequent final rinse zone 6. Room dividers, such as curtains, can be arranged between different work zones to prevent warm and / or humid air from passing through. Curtains or other barriers can be arranged at the inlet and outlet of the dishwasher 1 to prevent warm and / or humid air from escaping.

[0040] The main rinse zone 4 and, if applicable, the neutral zone 10 are adjacent to the conveying direction, and the final rinse zone 6 is followed. The final rinse zone 6 has its own door with door contact sensor 65.

[0041] The final rinse zone 6 comprises a tank 60 for rinse liquid. The tank of the final rinse zone 6 has a fill level sensor 61 and a temperature sensor 63. At least one pump pumps the rinse liquid from the tank 60 of the final rinse zone 6. This rinse liquid from the tank 60 of the final rinse zone 6 can be delivered to the washware on the inlet side in the conveying direction or optionally in the neutral zone 10 in order to wash it and / or apply rinse aid. An overflow pump can pump rinse liquid from the tank 60 of the final rinse zone 6 to the tank 40 of the main rinse zone 4.

[0042] In the rinse zone 6, the washware is subjected to water from the rinse pump 20 on the outlet side in the conveying direction in order to free the washware of rinse water. The tank 60 of the rinse zone is supplied with water by the rinse pump 20. The rinse pump 20 can supply water to the rinse zone 6, in particular via the pressure boiler or another heating medium. The water provided by the rinse pump 20 for the rinse zone can be cold or hot. The water provided by the rinse pump 20 is preferably heated in the dishwasher 1, here: in the rinse zone 6, with a heating medium before the washware is exposed to it in the washing mode. The heating medium can comprise, for example, a heat exchanger, a heat pump and / or a boiler. The heating medium is equipped with a temperature sensor 64. The rinse zone 6 is arranged at an outlet opening of the dishwasher for cleaned washware.

[0043] The dishwasher 1 can have a drive error sensor 66, which can be assigned to a work zone, for example, the final rinse zone 6. The drive error sensor 66 can be designed and configured to detect errors in the actuation of the transport device 11. The sensor signal of the drive error sensor 66 (drive sensor signal) can, for example, be continuously checked. The drive sensor signal can be a digital signal, and in this case, signal filtering can be omitted. It can be expedient to debounce the drive sensor signal. If an impermissible deviation of the drive sensor signal from a target value is detected, a corresponding error signal (drive error signal) can be generated immediately. The error signal can, for example, indicate the overheating of a drive motor. Without a functioning drive, maintaining the dishwashing operation is generally not possible.A drive error signal detected by the drive error sensor 66 can be assigned error class IV.

[0044] Both the Fig. 1 and Fig. 2 described first embodiment of a dishwasher as well as the following with reference to the Fig. 3 and Fig. The second exemplary embodiment of a dishwasher 1 described in Figure 4 comprises, for example, motors, pumps, valves, and heating means as actuators. The actuators can be designed and configured to receive control signals from control electronics or other electronic units of the dishwasher 1. The heating means of the dishwasher can comprise the heating means for heating water from the rinse pump 20. Additionally or alternatively, the heating means of the dishwasher can comprise at least one heating means, such as a heating element, in one or more tanks 30, 40, 50, and / or 60 holding the rinse liquid. Preferably, two individually operated heating means are provided in each of the tanks 30, 40, 50, and / or 60 holding the rinse liquid.

[0045] The dishwasher 1 can have, for example, the rinse pump 20, at least one pre-rinse pump, at least one main rinse pump, at least one cleaning pump, at least one overflow pump and / or at least one detergent pump as pumps.

[0046] Dishwashers may include valves in the form of electrically controllable control valves. The control valves may be designed to permit, interrupt, and / or adjust a flow rate. A control valve may, in particular, be designed and configured to permit or prevent the inflow of a liquid, such as water, liquid detergent, or rinsing liquid, to a tank, such as the water mains isolator 28, the pre-wash tank 30, the main wash tank 40 or 50, or the final rinse tank 60 (inflow control valve). A control valve may, in particular, be designed and configured to permit or prevent the outflow of a liquid, such as water, liquid detergent, or rinsing liquid, from a tank, such as the water mains isolator 28, the detergent tank 48 or 58, the pre-wash tank 30, the main wash tank 40 or 50, or the final rinse tank 60 (outflow control valve).A control valve can in particular be designed and arranged to allow or prevent the flow from a pump to a working zone.

[0047] The dishwasher 1 can have one or more cleaning pumps which are designed and configured to convey, in the rinsing or draining operating state, rinse water from one or more of the tanks 30, 40, 50 and / or 60 of the rinsing zones, ie the pre-rinse zone 3, the main rinse zone 4 or 5 and / or the final rinse zone 6, to a waste water drain 19 of the dishwasher.

[0048] A dishwasher may have one or more drying zones 7. If an error signal is detected indicating a failure of one or more drying zones, a modified wash cycle with limited drying or no drying can be performed. Alternatively, a modified wash cycle with a reduced conveyor speed and / or increased drying performance (temperature and / or air flow) can be performed in the remaining drying zone(s).

[0049] The dishwasher 1 can have at least one safety circuit sensor. It may be preferred for several work zones, in particular each work zone, to have at least one safety circuit sensor. A safety circuit sensor can comprise a reed switch. A safety circuit sensor can output an error signal indicating operation or failure of the work zone or zones assigned to it.

[0050] The Fig. 1 and Fig. The dishwasher shown in Figure 2 can, for example, be operated in a machine state according to an error class associated with a modified continued operation if an error signal is detected indicating a failure of the pre-wash zone 3 or a non-critical error of the final rinse zone 6 and / or the main wash zone 5. If an error signal is detected indicating a failure of the final rinse zone 6 and / or the main wash zone 5, the dishwasher reaches an error class associated with a complete failure machine state.

[0051] Fig. 3 shows a dishwasher according to a second embodiment of the present invention and Fig. 4 a flow diagram of the dishwasher according to Fig. 3. The Fig. The dishwasher shown in Figure 3 is a rack conveyor dishwasher. It differs from the dishwasher shown in Fig. 1 illustrated embodiment by the number and type of their working zones. For the same or similar components of the Fig. 3 and Fig. 4, the same or similar reference numerals are used to simplify readability as in the dishwasher shown in Fig. 1 and Fig. 2. Unless expressly stated otherwise, it should be understood that the description of the first embodiment also applies to the second embodiment, and vice versa.

[0052] The Fig. 3 and Fig. The dishwasher 1 shown in Figure 4 has several consecutive work zones. The dishwasher 1 comprises, in succession, an inlet zone 2, a pre-wash zone 3, a first neutral zone 10, a first main wash zone 4, a second main wash zone 5, a second neutral zone 10, a final rinse zone 6, and a drying zone 7. The pre-wash zone 3, the first main wash zone 4, the second main wash zone 5, the final rinse zone 6, and the drying zone 7 each have their own door with their own door contact sensor 35, 45, 55, 65, or 75. The individual door contact sensors 35, 45, 55, 65, or 75 can be designed and configured to detect when the door is open. A sensor-specific door open sensor signal can be transmitted as a digital signal and debounced if necessary.If a door open sensor signal is detected that indicates an open door position, a corresponding predetermined error signal (door open error signal) can be triggered immediately (in less than 0.5 seconds, in particular no more than 0.1 seconds, preferably no more than 0.05 seconds, particularly preferably no more than 0.01 seconds). A door open error signal can, in particular, immediately trigger a shutdown of all safety-relevant components of the zone or zones assigned to the respective door contact sensor, or of the entire dishwasher. The basic functionality of the dishwasher remains unaffected, so that the door open error signal can, for example, be assigned an error class I.

[0053] At the Fig. In the dishwashers 1 shown in Figure 3, the pre-wash zone 3 comprises a tank 30 for washing liquid. The tank 30 of the pre-wash zone 3 has a fill level sensor 31 and a temperature sensor 33. At least one pre-wash pump pumps the washing liquid from the tank 30 of the pre-wash zone to wet the dishes.

[0054] The pre-wash zone 3 is followed in the conveying direction by the first main wash zone 4. The first main wash zone 4 comprises a tank 40 for washing liquid. The tank 40 of the first main wash zone 4 has a fill level sensor 41 and a temperature sensor 43. At least one main wash pump pumps the washing liquid for cleaning the dishes in the first main wash zone from the tank 40 of the first main wash zone 4.

[0055] The first main wash zone 4 is followed in the conveying direction by the second main wash zone 5. The second main wash zone 5 comprises a tank 50 for washing liquid. The tank 50 of the second main wash zone 5 has a fill level sensor 51 and a temperature sensor 53. At least one main wash pump conveys the washing liquid for cleaning the items to be washed in the second main wash zone from the tank 50 of the second main wash zone 5.

[0056] According to Fig. 4, not the frontmost main wash zone 4 in the conveying direction, but the rearmost main wash zone 5 is equipped with a receptacle for cleaning agent in liquid form, which can be implemented as a cleaning agent tank 58. The fill level sensor 52 of the cleaning agent tank 58 can be designed and configured to detect the quantity or fill level of the liquid cleaning agent present in this receptacle. The receptacle for liquid cleaning agent can have a cleaning agent pump to supply the cleaning agent from the cleaning agent tank 58 to the second main wash zone 5, in particular to pump it into its cleaning agent tank 50.

[0057] The rinse pump 20 can supply cold water, in particular, to the main rinse zone 4 and the main rinse zone 5. An overflow pump can pump rinse liquid from the tank 60 of the rinse zone 6 to the first tank and / or the tank 50 of the second main rinse zone 5.

[0058] A first neutral zone 10 is arranged between the pre-wash zone 3 and the main wash zones 4, 5. A second neutral zone 10 is arranged between the main wash zones 4, 5 and the post-wash zone 6.

[0059] The final rinse zone 6 is followed in the conveying direction by a drying zone 7. The drying zone 7 is designed and configured to remove water and, if necessary, rinsing liquid from the washware, in particular by exposure to relatively dry and / or warm air. The drying zone 7 is arranged at an outlet opening of the dishwasher for cleaned washware. The drying zone can have sensors, for example, at least one temperature sensor for detecting the temperature in the drying zone 7.

[0060] The Fig. 3 and Fig. The dishwasher 1 shown in Figure 4 has a plurality of work zones designed as main wash zones 4, 5. If the pre-wash zone 3, or only one (or generally: not all) of the main wash zones 4, 5, fails, the dishwasher 1 can be operated in a modified continued operation like a smaller model. The dishwasher 1 can compensate for the failed work zone. With a view to achieving a hygiene result, the transport device 11 can be operated at a reduced conveying speed. By operating the transport device 11 more slowly than in normal operation without a failed work zone, the washware remains in the area of ​​the remaining work zones for longer. Preferably, the conveying speed can be adjusted in a modified continued operation such that the washware is exposed to the washing liquid for at least a predetermined minimum cleaning period.For example, a work zone may fail if an error signal is detected that is associated with a defective pump classified as necessary for the operation of that work zone, or if an error signal is detected that indicates a defective detergent tank level sensor or a detergent tank with a critical fill level. The failure of an individual zone of dishwasher 1 can be assigned an error class I, II, III, or IV.

[0061] Fig. Figure 5 shows a schematic representation of a method for operating a dishwasher such as the one described above. Fig. Figure 6 shows another schematic representation of the method for operating the dishwasher.

[0062] Fig. 5 schematically shows a process for determining a machine state m1, m2, m3 based on at least one error signal f01, f02, f03. First, an error signal f01, f02, or f03 is detected. Preferably, detecting at least one error signal f01, f02, or f03 requires one or more predetermined conditions b01, b02, and b03, or b04, b05, and b06, or b07, b08, and b09 relating to a combination of multiple control and / or sensor signals s01, s02, s03, s04, s05, s06, s07, s08, and / or s09.

[0063] It can be provided that an error signal f01, f02 or f03 is generated and detected when several control and / or sensor signals s01, s02 and s03, or s04, s05 and s06, or s07, s08 and s09 jointly satisfy a set of predetermined conditions b01, b02 and b03 or b04, b05 and b06 or b07, b08 and b09. An error signal f01, f02 or f03 can in particular be generated as a binary signal, wherein a binary 1 indicates the presence of an error defined by the conditions of the error signal and wherein a binary 0 indicates the absence of the error defined by the conditions of the error signal, or vice versa.

[0064] A machine state can be determined by processing the applied error signals f01, f02, and f03 using an intelligent error management system. The intelligent error management system can manage multiple machine states. Each machine state is identified by a different number and combination of error signals. In the example shown, a first machine state m01 is assigned to a first error signal f01 in combination with a second error signal f02, a second machine state m02 is assigned to a third error signal f04 in combination with a fourth error signal f04, a third machine state m04 is assigned to the first error signal f01 in combination with a fifth error signal f05, and a fourth machine state m04 is assigned to a sixth error signal f06 in combination with the third error signal f03.

[0065] The incoming error signals are continuously compared with the error signals assigned to the respective states. If there is a match between the incoming error signals and the predetermined combination of error signals assigned to a machine state, that machine state is selected. Each machine state is assigned a reaction that is executed as soon as the machine state is reached.

[0066] An error signal can be detected, for example, if the contact sensor 22 or the fill level sensor 42 or 48 detects a lack of solid or liquid detergent or rinse aid. The error management system can then trigger the corresponding machine status (lack of solid detergent or lack of liquid detergent). In response to this machine status, an error message can be output, for example, on a display and / or via another communication interface of the dishwasher, indicating the lack of liquid or solid detergent. Additionally or alternatively, the error message can be archived in a memory.

[0067] Another example concerns the failure of the heating medium in the tank of the main wash zone 4 of the first embodiment or the main wash zone 5 of the second embodiment, into which the cleaning agent is dosed. If the tank heating fails, no more cleaning agent may be added, because otherwise there is an increased risk of critical foam formation, which could impair the hygiene result.

[0068] The sensor signal from temperature sensor 43 or 53 is continuously recorded and processed. The actual temperature value represented as a sensor signal is compared with a predetermined target value when all predefined secondary conditions are also met. As a secondary condition, it can be continuously checked, in particular, that no water enters tank 40 or 50, which could impair the temperature measurement. As long as all predefined secondary conditions are met, a temperature profile can be recorded over a predefined time corridor using temperature sensor 43 or 53. The temperature profile results in a temperature difference, which is compared with the predefined target value. In the event of a defective heating medium, a temperature difference is detected and recorded as a deviation, and consequently a corresponding error signal is generated. This is then evaluated by the error management system.The error management system detects that, due to the constellation described above, an error signal is present as a binary 1. Based on the error signal, the associated response is to adjust or deactivate the detergent dosage. In addition, a corresponding error message can be generated and displayed.

[0069] The detection of an error signal f01, f02 or f03 may, as described above, include a check to determine whether one or more conditions b01 to b09 are met. As described in Fig. 6, a predetermined error signal f01 can be detected, for example, when several conditions are present, wherein a first condition can relate to the presence of a first sensor signal s01 of a first sensor deviating from a predetermined target value, a second condition can relate to the simultaneous presence of a second sensor signal s02 of a second sensor deviating from a predetermined tolerance range and a third condition can relate to the fact that the first and the second condition exist during an active operating state of the dishwasher.

[0070] The sensor signals from the sensors, particularly as voltage signals, are received at the various signal inputs of at least one electronic unit, such as a multi-tank conveyor dishwasher control device. All further processes for operating the dishwasher can be carried out by an electronic unit, particularly implemented by software. Analog sensor signals can be filtered to minimize potential signal noise and / or to eliminate potential signal peaks. Digital sensor signals can be debounced by timing elements. The filtered or debounced sensor signals, in particular, are compared with stored target values ​​by the electronic unit. The target values ​​can be stored in a database, which can be implemented as part of the electronic unit. In addition to the comparison of control signals with the corresponding, stored target values, operating states can be taken into account.These operating conditions can result from the dishwasher's control system.

[0071] To detect error signals based on the sensor signals, all information that results in predetermined, separate conditions is taken into account. Each error signal f01, f02, f03, etc. is described by a combination of conditions b01, b02, b03, etc. If the conditions for an error signal are present together, the corresponding error signal can be generated, for example, using a plausibility check, preferably implemented in software. The resulting error signal is fed to the intelligent error management system.

[0072] It is clear that the Fig. 5 and Fig. The number of conditions, error signals, error classes and machine states shown in Figure 6 is purely exemplary.

[0073] For example, a plausibility check for the presence of liquid cleaning agent can be performed by verifying whether a sensor signal from a cleaning agent level sensor with a value (e.g., a digital 1) is present for a predetermined period of time, indicating the absence of cleaning agent. In this case, an error signal can be generated and emitted that represents a cleaning agent level that is empty. As a result of an error signal indicating a cleaning agent level that is empty, an error condition with impaired hygiene results can be determined. The error signal associated with a cleaning agent level that is empty can trigger a corresponding predetermined error class (e.g., error class II).

[0074] Alternatively or additionally, a plausibility check can be carried out with regard to the presence of rinse aid, wherein a sensor signal indicating the presence or absence of rinse aid can in particular be continuously monitored. Further alternatively or additionally, a plausibility check can be carried out with regard to the presence of cleaning agent in solid form, wherein a sensor signal indicating the presence or absence of cleaning agent in solid form can in particular be continuously monitored. Plausibility checks can be carried out individually for sensor signals from a single sensor in order to trigger individual error signals if necessary, for example an error signal associated with a solid detergent level being empty or an error signal associated with a rinse aid level being empty. Alternatively, a plausibility check can be carried out that takes into account several sensor signals from different fill level sensors.Such a plausibility check may, in some cases, trigger an error signal associated with an unclearly defined vacancy, but as a result, an error condition with impaired hygiene results can be determined.

[0075] As an exemplary example of the method for operating a dishwasher, the behavior resulting from a failed rinse pump 28 is described below. Because water can no longer be provided to dishwasher 1 when the rinse pump fails, the corresponding error signal is assigned to a critical error state, which corresponds to a failure of the entire dishwasher 1. The failure of the entire dishwasher can be assigned to error class IV. To generate a first error signal, the combination of the following conditions can be considered: • Condition A: Rinse pump 20 is active; • Condition B: Rinse pump 20 has been running faster than a predetermined minimum speed for at least 2 seconds; • Condition C: All inlet solenoid valves of the water mains separator 28 are closed; and • Condition D: Using the level sensor 21, it is determined that the level in the water network separator 28 does not drop by a predetermined minimum amount within a predetermined time.

[0076] To generate a second error signal, the following condition can also be taken into account: • Condition E: Dishwasher 1 is in filling mode or in rinsing mode.

[0077] If both the first and second error signals are present, they are compared with the predetermined error classes, and the corresponding error class is defined, here: error class n. The first and second error signals are stored in error class n. Based on the presence of these two error signals, a corresponding machine state can be derived. This machine state can trigger the following reaction: ◯ All actuators are deactivated ◯ An error code assigned to the error class is transmitted to a display unit ◯ The dishwasher is switched off

[0078] In this way, the dishwasher can be brought into a safe condition to prevent further damage.

[0079] The description and figures describe preferred embodiments of the subject matter claimed by the appended claims. The features of the invention disclosed in the description, claims, and figures can be used both individually and in any combination to implement the invention. The optional features disclosed in the above description, claims, and drawings can be used both individually and in any combination to implement the subject matter claimed here according to the appended claims in their various forms.

[0080] The various aspects and embodiments described above may be combined to create yet further embodiments. These and other changes may be made to the embodiments in light of the above detailed description. In general, the terms used in the following claims should not be construed to limit the claims to the specific aspects and embodiments disclosed in the description and claims, but rather to encompass all possible embodiments, along with the full scope of equivalents to which such claims are entitled. List of reference symbols: 1 dishwasher 2 Inlet zone 3 Pre-rinse zone 4 first main rinsing zone 5 second main rinsing zone 6 Rinse zone 7 dry zones 10 Neutral Zone 11 Transport device 19 Wastewater drain 20 Rinse pump 21 Level sensor 22 Contact sensor 24 drawer sensor 26 Fresh water inlet 27 Inlet for second-quality water 28 water network separators 30 tanks 31 Level sensor 33 Temperature sensor 35 Door contact sensor 40 tanks 41 Level sensor 42 Level sensor 43 Temperature sensor 45 Door contact sensor 48 Detergent tank 50 tanks 51 Level sensor 52 Level sensor 53 Temperature sensor 55 Door contact sensor 58 Detergent tank 60 tanks 61 Level sensor 66 Drive error sensor 63 Temperature sensor 65 door contact sensor 64 Temperature sensor 73 Temperature sensor 65 door contact sensor 75 door contact sensor b01, b02, b03 condition b04, b05, b06 condition b07, b08, b09 condition f01, f02, f03 error signal f04, f05, f06 error signal m01, m02, m03, m04 machine status s01, s02, s03 sensor signal s04, s05, s06 sensor signal s07, s08, s09 sensor signal 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 198 05 066 A1

[0002] DE 42 41 064 A1

[0002] DE 10 2007 016 331 A1

[0002] DE 10 2014 114 719 A1

[0002] US 2019 290 096 A1

[0003]

Claims

[1] Control device for a dishwasher (1), wherein the control device is designed and configured to carry out a method for operating a dishwasher (1) with several successive work zones and / or work processes for cleaning washware, the method comprising: Detecting at least one error signal (f01, f02, f03), Determining a machine state (m1, m2, m3) based on the at least one error signal (f01, f02, f03), Initiating at least one reaction associated with the machine state (m1, m2, m3), wherein the machine state is determined on the basis of the at least one error signal (f01, f02, f03) as a normal state, a first error state with unimpaired hygiene result, a second error state with impaired hygiene result, a third error state with at least one failed work zone and / or with at least one omitted work process and / or a fourth error state with interruption of the operation of the dishwasher (1). [2] Control device according to claim 1, wherein causing the reaction comprises switching off at least one of the work zones and / or omitting at least one of the work processes, preferably wherein the detected error signal indicates an operating error of the dishwasher in the switched off at least one work zone and / or in the switched off at least one work process. [3] Control device according to claim 1 or 2, wherein determining the machine state (m1, m2, m3) comprises defining or identifying an error class on the basis of the at least one error signal (f01, f02, f03) and selecting a machine state (m1, m2, m3) corresponding to the error class. [4] Control device according to one of the preceding claims, wherein the determination of the machine state (m1, m2, m3) comprises a check as to whether the items to be washed in the dishwasher (1) are exposed to a rinsing liquid containing a detergent for at least a predetermined minimum cleaning period, and / or a check as to whether at least a predetermined minimum amount of detergent is added to the rinsing liquid for applying it to the items to be washed. [5] Control device according to one of the preceding claims, wherein the method further comprises operating a transport device (11) for successively conveying wash ware through the plurality of work zones, wherein the transport device (11) is operated at a first conveying speed in the normal state, and wherein the transport device (11) is operated at a second conveying speed in the first fault state, the second fault state and / or the third fault state, which is lower than the first conveying speed and is preferably selected such that a predetermined hygiene value is achieved for the washed ware dispensed by the dishwasher. [6] Control device for a dishwasher (1), wherein the control device is designed and arranged to carry out a method for operating a dishwasher (1) with several successive work zones and / or work processes for cleaning washware, the method comprising: Detecting at least one error signal (f01, f02, f03), Determining a machine state (m1, m2, m3) based on the at least one error signal (f01, f02, f03), Initiating at least one reaction associated with the machine state (m1, m2, m3), wherein the detection of at least one error signal (f01, f02, f03) comprises the detection of sensor signals (s01, s02, s03, s04, s05, s06, s07, s08, s09) of several sensors and a comparison of at least one of the sensor signals (s01, s02, s03, s04, s05, s06, s07, s08, s09) with a corresponding target value, tolerance range and / or threshold value, and wherein the detection of sensor signals (s01, s02, s03, s04, s05, s06, s07, s08, s09) comprises the detection of a fill level signal of a fill level sensor (31, 41, 51, 61) which measures a fill level in a tank, and the detection of a temperature sensor signal from a temperature sensor (33, 43, 53, 63) which measures a temperature of a rinsing liquid, in particular in the tank. [7] Control device according to claim 5 or 6, wherein the method further comprises operating the dishwasher (1) either in an active operating state, such as a filling operating state, a rinsing operating state and / or a draining operating state, or an inactive operating state, such as a switched-off operating state, wherein the detection of the error signal (f01, f02, f03) requires the operation of the dishwasher in the active operating state, and / or wherein the at least one sensor signal (s01, s02, s03, s04, s05, s06, s07, s08, s09) is detected during an active operating state of the dishwasher. [8] Control device for a dishwasher (1), wherein the control device is designed and arranged to carry out a method for operating a dishwasher (1) with several successive work zones and / or work processes for cleaning washware, the method comprising: Detecting at least one error signal (f01, f02, f03), Determining a machine state (m1, m2, m3) based on the at least one error signal (f01, f02, f03), Initiating at least one reaction associated with the machine state (m1, m2, m3), wherein the detected error signal indicates an operating error of the dishwasher in one of the work zones and / or in one of the work processes and the reaction causes a change in an operating parameter in another of the work zones and / or in another of the work processes, preferably wherein the changed operating parameter causes a change in the achieved hygiene value of the washed items dispensed by the dishwasher. [9] Dishwasher (1) with several successive working zones and / or working processes for cleaning dishes and a control device according to one of the preceding claims. [10] Dishwasher (1) according to claim 9, wherein the dishwasher (1) is a conveyor dishwasher.

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