EP2301407B1 - Lave-vaisselle et procédé de commande correspondant - Google Patents

Lave-vaisselle et procédé de commande correspondant Download PDF

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Publication number
EP2301407B1
EP2301407B1 EP10173654.4A EP10173654A EP2301407B1 EP 2301407 B1 EP2301407 B1 EP 2301407B1 EP 10173654 A EP10173654 A EP 10173654A EP 2301407 B1 EP2301407 B1 EP 2301407B1
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EP
European Patent Office
Prior art keywords
water
limit value
temperature
household dishwasher
gow
Prior art date
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Application number
EP10173654.4A
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German (de)
English (en)
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EP2301407A3 (fr
EP2301407A2 (fr
Inventor
Franz GRÜLL
Anton Oblinger
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP2301407A2 publication Critical patent/EP2301407A2/fr
Publication of EP2301407A3 publication Critical patent/EP2301407A3/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4217—Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/06—Water supply, circulation or discharge information
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/32—Stopping or disabling machine operation, including disconnecting the machine from a network, e.g. from an electrical power supply

Definitions

  • the present invention relates to a dishwasher, in particular a household dishwasher, with a control device for controlling the dishwasher and with at least one water inlet controllable by the control device for receiving water, which is provided for connection to at least one external water supply.
  • the items to be washed, in particular dishes are cleaned with the aid of water.
  • at least one water inlet is provided, which can be controlled by a control device of the dishwasher.
  • the water inlet In order to be able to carry out the absorption of water, provision is made here for the water inlet to be connected to an external water supply.
  • an external water supply can in particular be a water supply installed in the building.
  • the KR 2005 0021833 A and the KR 2004 0046227 A each describe the use of a temperature sensor in a washing machine to prevent damage from washing water that is too hot.
  • the U.S. 2004/255977 A1 , the FR 2 558 713 A1 and the EP 0 703 311 A1 describe the use of temperature-dependent resistors in a water supply line to a dishwasher in order to infer a water flow from a resistance value that varies over time.
  • the US 6,255,952 B1 describes a procedure in which a temperature sensor in the water supply line is used to check whether the water supply is working as intended.
  • a household dishwasher with a control device that compares the temperature of the water with two different limit values and that provides for various measures if the respective limit value is exceeded is off JP H09 135802 A known.
  • a disadvantage of the known dishwashers is that a connection of the water inlet device to an unsuitable external water supply or to a faulty external water supply often goes unnoticed, which can result in damage to the dishwasher.
  • control device is designed to automatically control at least one monitoring sequence in which one or more limit values for a temperature of the water provided by the external water supply connected to the controllable water inlet are monitored .
  • the items to be washed are placed in a washing compartment and cleaned there in a washing process, which is also called a washing cycle, with the aid of washing liquor and then dried.
  • the goal here is to carry out a wash cycle in particular in such a way that a predefined cleaning result and a predefined drying result are achieved as efficiently as possible.
  • What is required here is a high overall efficiency, which expediently results from the cleaning efficiency and the drying efficiency.
  • the cleaning efficiency corresponds in particular to the ratio of the cleaning result achieved by means of a wash cycle and the effort required for this, wherein the effort can include several dimensions, for example the energy requirement, the water requirement and/or the time requirement.
  • the drying efficiency corresponds in particular to the ratio of the drying result achieved by means of a rinsing cycle and the effort required for this, whereby the effort here can also include several dimensions, for example the energy requirement and/or the time requirement.
  • a washing liquor is understood to mean a liquid which is intended to be applied to the items to be washed in order to clean them and/or treat them in some other way.
  • the washing liquor can be provided for heating the items to be washed, which is common, for example, during a rinsing step.
  • a rinsing liquor generally consists mainly of water.
  • the washing liquor can be enriched with cleaning agents, with cleaning aids, such as rinse aid and/or with dirt that has been loosened from the items to be washed.
  • a control device in which one or more wash programs for controlling a wash cycle for cleaning items to be washed are stored.
  • the control device can be designed as a so-called sequence control, in particular as an electronic sequence control.
  • several washing programs are provided, one of which can be selected and started by the operator. This makes it possible to adapt the course of a wash cycle in particular to the load quantity, the type of load, the degree of soiling of the items to be washed and/or the desired duration of the wash cycle.
  • At least one washing program for cleaning the items to be washed comprises a rinsing step in which water is absorbed, a washing liquor comprising absorbed water is formed and the items to be washed in the washing chamber are sprayed with washing liquor.
  • the rinsing program expediently provides for several such rinsing steps. In this order, it can in particular be a pre-rinse step, a cleaning step, an intermediate rinse step and a final-rinse step. However, rinsing programs can also be provided in which one or more of these program steps are hidden. Washing programs are also possible in which one or more of these program steps are run through several times. Furthermore, a typical washing program includes a subsequent drying step for drying the cleaned items to be washed.
  • a pre-rinse step is primarily used to remove coarse soiling from the items to be washed.
  • the purpose of a subsequent cleaning step is to completely remove soil from the dishes.
  • An intermediate rinsing step that is now carried out serves in particular to remove cleaning agent residues which are adhering to the items to be washed.
  • cleaning agents can expediently be added to the washing liquor in order to improve the cleaning effect.
  • a subsequent rinsing step is provided in particular to avoid stains on the items to be washed, which could be caused by dissolved substances in the water, such as salt and/or limescale.
  • rinse aid can be added to the washing liquor during the rinsing step.
  • the dishwasher can provide what is known as self-drying, in which case a further task of the rinsing step is to prepare the subsequent drying step.
  • the items to be washed are heated to a high temperature by the washing liquor during the rinsing step, so that in the subsequent drying step water droplets adhering to the hot items to be washed evaporate and condense on the respective inside of the washing compartment due to the lower temperature prevailing there.
  • the dishwasher can have an automatic dosing device.
  • the water required to carry out washing cycles is taken in via a water inlet device which has at least one controllable water inlet.
  • the water inlet is connected to an external water supply.
  • the water inlet can include a valve, which can be designed as a solenoid valve.
  • a valve is designed in such a way that it only has an open state and a closed state.
  • By using valves of this type it is possible in a simple manner to take up the amount of water that is required in each case, depending on the respective washing program.
  • throttle valves or other controllable valves which make it possible to precisely control the flow of water. In both cases, an external device for controlling the water intake can be dispensed with.
  • valve can be arranged at an upstream end of a supply hose and designed in such a way that it can be fastened to a connecting piece of the external water supply.
  • the valve can have a connection thread, for example, which corresponds to the threads of standard household water taps.
  • Such valves are designed in particular as so-called aquastop valves.
  • a downstream end of the feed hose is connected to the washing chamber of the dishwasher via a connection piece fixed to the housing in order to conduct liquids, so that the water taken up is fed into the washing chamber.
  • the arrangement of the valve at the upstream end of the water inlet has the advantage that practically no leaking water can escape from the dishwasher, even in the event of damage, as long as the valve is closed. If the valve is designed to close when not energized, leakage from a dishwasher that is off is practical prevented in all cases.
  • the supply hose can be designed as a safety hose with an inner water-carrying pressure hose and an outer enveloping hose, with a leaking water channel being provided between the pressure hose and the enveloping hose for discharging any leaking water that may occur.
  • a leaking water sensor for detecting leaking water can be assigned to the control device, so that the control device can close the valve if leaking water occurs during operation of the dishwasher.
  • the water inlet of a dishwasher ie in particular the valve and the feed hose, are expediently adapted in terms of construction to technical features of the external water supply to which the water inlet is to be connected. Determining factors for the design of the water inlet are in particular the temperature and/or the pressure of the water supplied by the external water supply. If the actual temperature of the water supplied by the external water supply deviates significantly from the intended temperature, damage to the dishwasher and there in particular to the water inlet can occur. In the case of a significant temperature deviation, damage is possible in a relatively short time, but in the longer term damage is to be feared even with smaller temperature deviations.
  • control device of the dishwasher according to the invention is designed to automatically control and carry out at least one monitoring sequence for the temperature of the water provided by the external water supply, damage to the dishwasher can be avoided both in the short term and in the long term.
  • At least one limit value for the temperature of the water supplied is monitored as part of the monitoring sequence.
  • the at least one limit value to be monitored can be stored in the control device, for example in an electronic memory of the control device.
  • the or the limit values can be set in advance so that a deviation of the actual temperature of the supplied water is recognized by a setpoint, which could cause damage to the dishwasher.
  • By monitoring predefined limit values it is possible in particular to identify temperature deviations which are based on a malfunction or incorrect operation of the external water supply or which are based on the water inlet being connected to an unsuitable water supply from the outset. If the dishwasher has several water inlets, one or more limit values can be monitored for each inlet.
  • the monitoring sequence provides for a measurement of the temperature of water taken in via the water inlet by means of a temperature sensor.
  • the limit value(s) is/are monitored on the basis of the actual temperature of the water provided. Since the measurement is carried out on water that has already been taken in via the water inlet, it is ensured that the temperature of the water that is being used on the dishwasher is also recorded. In comparison to solutions in which the temperature is measured outside the dishwasher, i.e. in particular in the area of the external water supply, this also results in a simplification, since a data connection between the control device of the dishwasher and an external measuring device can be dispensed with.
  • the measurement can be provided in particular during a washing program for washing dishes when the water inlet is activated for the first time to take up water. This takes account of the fact that the temperature of the water provided can change between two washing programs. If the measurement takes place when the water inlet is activated for the first time as part of a washing program, it is ensured that an intolerable temperature deviation of the water can be detected at an early stage.
  • the first recording of Water during a washing program can, for example, take place as part of the pre-wash step or as part of a first cleaning step.
  • the temperature sensor is arranged downstream of the at least one water inlet.
  • Practically all modern dishwashers have such a temperature sensor. This can be used, for example, to control the heating device of the dishwasher while a washing program is being carried out. In this way, an additional temperature sensor can be dispensed with, so that the structure of the dishwasher is simplified.
  • the dishwasher has several water inlets, it is also possible with such a temperature sensor arranged downstream of the water inlets to measure the temperatures of several water supplies with just one sensor. This can be done by first opening a first water inlet, then measuring the temperature of the water taken in above it, then closing the first water inlet and later opening another water inlet in order to measure its water temperature.
  • the monitoring sequence includes a comparison of the temperature of the water to an upper limit for the temperature of the water.
  • An upper limit value is understood to mean a limit value that limits a tolerance range for the temperature of the water at the top. If the temperature of the water is below an upper limit value, no measures dependent on the result of the comparison need to be taken as a rule. If, on the other hand, the temperature of the water is above an upper limit value, a measure linked to the limit value can be carried out.
  • the storage of upper limit values in particular prevents damage that could occur if the water temperature is too high.
  • the monitoring sequence further includes a comparison of the temperature of the water to a lower limit for the temperature of the water.
  • a lower limit value take action when the water temperature is lower than the lower limit. In this way, damage to the dishwasher due to the water temperature being too low can be avoided.
  • At least one of the limit values is a warning limit value which, when exceeded, provides for a warning message to be output via output means that can be controlled by the control device, in particular via acoustic and/or visual output means.
  • a warning limit can be an upper warning limit, which is considered to have been exceeded when the temperature is greater than the warning limit.
  • a warning limit value can also be a lower warning limit value, which is referred to as being exceeded when the temperature is lower than the warning limit value.
  • the control device expediently causes a warning message to be output. This notifies the operator that the temperature of the water provided deviates from the set temperature. The operator can then check the functionality of the external water supply connected to the water supply. He can also check whether the water inlet is connected to a generally suitable water supply. Triggered by the warning message, he can then take appropriate measures.
  • the warning limit value can be set in such a way that even a small difference in the temperature of the water from the intended water temperature is indicated. In this way, it is also possible to prevent damage to the dishwasher that only occurs over a long period of time.
  • the output means can include a buzzer and/or loudspeakers for outputting acoustic warning messages. Lamps, light-emitting diodes, alphanumeric displays and/or graphic displays can be provided for the output of optical warning messages.
  • At least one of the limit values is a cut-off limit value, which, when exceeded, terminates a water intake.
  • This can involve at least one upper termination limit value and/or at least one lower termination limit value.
  • Cut-off limit values for the respective water supply can be be determined that if the temperature of the water deviates from the set value, which results in the risk of damage occurring in the short term, the water supply is closed in order to avoid immediate damage in this way.
  • an abort message is output via output means that can be controlled by the control device, in particular via acoustic and/or visual output means.
  • the abort message can be output automatically by the control device via those output means which are also provided for outputting warning messages.
  • separate output means are also conceivable, which, however, can be constructed analogously to the output means for warning messages.
  • one of the one or more controllable water inlets is, in particular, a cold water inlet that is provided for connection to an external cold water supply, with the temperature of the water provided to the cold water inlet being expediently compared with an upper warning limit value and/or an upper termination limit value for the water temperature.
  • Cold water inlets for connection to a normal household cold water supply are constructed in such a way that they easily withstand the typical water temperatures of such a cold water supply over the entire service life of a dishwasher.
  • the valve and the feed hose for the cold water inlet can be precisely adapted to the expected water temperatures.
  • the feed hose can be damaged in the short or long term, depending on the respective temperature, and can become leaky, for example.
  • the valve designed for cold water can overheat and become inoperable as a result. Such damage to a cold water inlet can be avoided by monitoring at least one upper limit value.
  • the upper warning limit value for the water provided to the cold water inlet has a value between 25°C and 35°C.
  • the values mentioned are values which, if exceeded, indicate that either the cold water supply is connected to a hot water supply or that the cold water supply is inadvertently cross-connected to a hot water connection.
  • a warning message issued when such a warning limit value is exceeded can cause the operator to check the connection of the cold water inlet or the functionality of the cold water supply.
  • the upper termination limit value for the water made available to the cold water inlet has a value between 30°C and 40°C. Temperatures of the water taken in that are below these values can be coped with, at least for a short time, by a normal cold water supply. However, if this limit is exceeded, the operation of the dishwasher is interrupted in order to prevent immediate damage.
  • one of the one or more controllable water inlets is, in particular, a hot water inlet that is provided for connection to an external hot water supply, with a comparison of the temperature of the water provided for the hot water inlet with an upper warning limit value and/or with an upper termination limit value for the water temperature.
  • a hot water inlet that is provided for connection to an external hot water supply
  • the valve and/or the feed hose of a hot water inlet can also be damaged at particularly high temperatures, in particular above 50°C. Unforeseen high temperatures for a hot water supply can occur, in particular, in the event of incorrect operation or another malfunction of the connected hot water supply.
  • temperatures can also arise in the event of a malfunction in temperature control of a hot water supply.
  • the monitoring of an upper warning limit value and/or an upper termination limit value for the temperature of the water supplied to the hot water inlet can prevent damage caused by temperatures that are too high.
  • the upper warning limit value for the water made available for the hot water inlet has a value between 50°C and 70°C.
  • a hot water supply can usually withstand temperatures below these values, at least for a short time, although the unusually high temperatures are expediently communicated to the operator, so that he can prevent the hot water supply from being permanently exposed to temperatures exceeding the warning limit value.
  • the upper termination limit value for the water provided for the hot water inlet has a value between 60°C and 80°C.
  • the exact termination limit value is defined in such a way that short-term damage to the hot water supply can be reliably prevented.
  • the temperature of the water provided for the hot water inlet is compared with a lower warning limit value for the temperature of the water, the lower warning limit value preferably having a value between 30°C and 40°C.
  • the lower warning limit value preferably having a value between 30°C and 40°C.
  • the dishwasher according to the invention can include a cold water inlet and a hot water inlet, for each of which one or more limit values are monitored.
  • a water inlet device can also be referred to as a bi-thermal water inlet device.
  • the invention relates to a method for operating a dishwasher, in particular for operating a dishwasher according to the invention, which has a control device for automatically controlling the dishwasher and at least one water inlet, controllable by the control device, for receiving water, the water inlet being connected to at least one external water supply.
  • the control device monitors one or more limit values for a temperature of the water provided by the external water supply.
  • the method according to the invention makes it possible to avoid damage to a dishwasher.
  • FIG 1 shows an advantageous embodiment of a domestic dishwasher 1 according to the invention in a schematic side view.
  • the dishwasher 1 has a control device 2 in which at least one wash program for controlling a wash cycle for washing items to be washed, in particular dishes, is stored.
  • Several washing programs are expediently stored here, so that by selecting a suitable washing program, the course of a washing cycle controlled by the control device 2 can be adapted, for example, to the load quantity, the type of load, the degree of soiling of the items to be washed and/or the desired duration of the washing cycle.
  • the wash program or programs can include at least one pre-wash step, at least one cleaning step, at least one intermediate wash step, at least one final-rinse step and/or at least one drying step.
  • the control device 2 is assigned an operating device 3 which allows an operator of the dishwasher 1 to call up and start one of the washing programs. Furthermore, the control device 2 is assigned an output device 4 which enables messages to be output to the operator.
  • the output device 4 can include, for example, indicator lamps, light-emitting diodes, an alphanumeric display and/or a graphic display for the output of visual messages. Furthermore, the output device 4 can have a buzzer, a loudspeaker and/or the like for outputting acoustic messages.
  • the dishwasher 1 also includes a washing container 5, which can be closed by a door 6, so that a closed washing chamber 7 for washing items to be washed is formed.
  • a washing container 5 which can be closed by a door 6, so that a closed washing chamber 7 for washing items to be washed is formed.
  • the door 6 is shown in its closed position.
  • the door 6 can be brought into an open position by pivoting about an axis arranged perpendicularly to the plane of the drawing, in which it is aligned essentially horizontally and allows the insertion or removal of items to be washed.
  • the operating device 3 is arranged on an upper section of the door 6 in a user-friendly manner.
  • the output device 4 is also arranged on the upper section of the door 6, so that optical messages are clearly visible and acoustic messages are clearly audible.
  • the control device 2 is also positioned there, so that the necessary signal connections between the operating device 3, the output device 4 and the control device 2 can be kept short. In principle, however, it is possible to arrange the operating device 3, the output device 4 and/or the control device 2 at a different location.
  • the control device 2 could also have a decentralized design, which is understood to mean that it comprises components that are spatially separated from each other and are connected via communication means in such a way that they can interact.
  • the dishwasher 1 has an upper rack 8 and a lower rack 9 for positioning dishes.
  • the upper crockery basket 8 is arranged on extension rails 10 which are each fastened to a side wall of the washing compartment 5 .
  • the crockery basket 8 can be extended out of the washing compartment 5 by means of the extension rails 10 , which facilitates the loading and unloading of the upper crockery basket 8 .
  • the lower crockery basket 9 is arranged on extension rails 11 in a similar manner.
  • the dishwasher 1 comprises a water inlet 12, shown schematically.
  • the water inlet 12 comprises a valve 13, which can be controlled by the control device 2, and a feed hose 14.
  • the valve 13 can be designed as a solenoid valve, for example.
  • the input side of the valve 13 is designed in such a way that it can be attached to a connection piece WV of a standard household water supply, for example to a water tap WV.
  • the connection can be made in each case by means of a screw connection, a snap connection or the like.
  • Such a valve 13 can in particular be designed as an aquastop valve.
  • the outlet side of the valve 13 is connected to the feed hose 14 , the downstream end of which is connected to a connecting piece 15 on a housing 16 of the dishwasher 1 .
  • valve 13 In figure 1 the input side of the valve 13 is connected to a water tap WV of an external water supply WV. It is consequently possible by means of the water inlet 12 to receive water W from the external water supply WV and to conduct it into the interior of the dishwasher 1 .
  • the valve 13 is advantageously closed when it is not activated, so that the dishwasher 1 is disconnected from the water supply WV when it is switched off. In this way, in the event of a fault, water leakage from the switched off dishwasher 1 can be avoided.
  • the supply hose 14 can be designed as a safety hose with an inner water-carrying pressure hose and an outer enveloping hose, with a leaking water channel being provided between the pressure hose and the enveloping hose for discharging any leaking water that may occur.
  • the leaking water channel can be designed in such a way that leaking water which occurs during operation of the dishwasher 1 in the area of the water inlet 12 is routed into the interior of the dishwasher 1 via the connection piece 15 fixed to the housing. Here it can be detected by a leak water sensor, not shown, so that appropriate measures, such as closing the valve 13, can be initiated.
  • the dishwasher 1 also has in figure 1 non-illustrated components, which make it possible to conduct the recorded water W from the outlet of the housing-fixed connection piece 15 into the rinsing chamber 7 .
  • the water W taken in is first passed through a water treatment device (not shown) for treating the water W taken in before it reaches the rinsing chamber 7 .
  • a collection pot 18 is formed on a base 17 of the washing container 5, in which the water W introduced into the washing chamber 7 collects due to its gravity.
  • the collection pot 18 is in connection with a circulating pump 19, with the help of which water W containing washing liquor S can be pumped out of the collection pot 18 via a heating device 20 to a water diverter 21.
  • the circulation pump 19, the heating device 20 and the water diverter 21 are controlled by the control device 2 while the dishwasher 1 is in operation.
  • the heating device 20 is provided for heating washing liquor S and is designed as a continuous flow heater 20 .
  • an openly arranged heating element for example a heating element arranged in the washing chamber 7 or in the collection pot 18 , could also be provided.
  • the water diverter 21 enables the washing water S supplied by the circulating pump 19 to be forwarded in a controlled manner lower, rotatable spray arm 23, is connected.
  • the spray arms 22 and 23 form a spray device 22, 23 which is arranged in the washing chamber 7 and which enables washing liquid S to be applied to the items to be washed.
  • further outlets could also be provided, for example to enable the charging of further spray arms and/or fixed spray elements.
  • the water diverter 21 can be controlled in such a way that the washing liquor S conveyed by the circulating pump 19 is conveyed into the washing chamber 7 either through none of the spray arms 22, 23, through one of the spray arms 22, 23 or through both spray arms 22, 23.
  • a temperature sensor 24 is also provided, which is designed to record the temperature of the washing liquor S.
  • the temperature sensor 24 is arranged in the collection pot 18 in the exemplary embodiment. However, it could also be provided at another point where thermal contact with the washing liquor S containing the water W introduced is possible.
  • the dishwasher 1 can also have a dosing device 25 which is arranged, for example, on the inside of the door 6 .
  • the dosing device 25 can be controlled by the control device 2 and enables detergents and/or cleaning aids, such as rinse aid, to be automatically added to the washing liquor S during a wash cycle.
  • the dishwasher 1 includes a drain pump 26, with the help of which washing solution S that is no longer required can be pumped out as waste water AW from the collection pot 18 via a waste water connection 27 to the outside.
  • the waste water connection 27 can be connected to an external waste water disposal system using a waste water hose (not shown).
  • the figure 1 Dishwasher 1 shown can be configured to hold cold water W overall.
  • Cold water W is understood to mean water W which is provided by a normal household cold water supply WV and typically has a temperature in the range from 10°C to 20°C, in exceptional cases in the range from 5°C to 25°C.
  • the water inlet 12 is designed in such a way that it can withstand these temperatures over the entire service life of the dishwasher 1 .
  • the figure 1 Dishwasher 1 shown for receiving hot water W may be provided.
  • Warm water W is understood to mean water W which is heated by means of a heating device from an external water supply, so that it has a target temperature of 50° C., for example.
  • the temperature of the water W provided by an external hot water supply WV can vary within a wide range, for example in a range from 40°C to 60°C, depending on the operating conditions of the external hot water supply WV.
  • both the intake of hot water W and cold water W can be provided in a dishwasher 1 according to the invention (not shown), which is referred to as a bi-thermal water connection.
  • the dishwasher 1 has two water inlets 12 which can each be connected to the connection piece 15 fixed to the housing.
  • the water inlet or inlets are provided for the operation of the dishwasher 1 connected to one or two external water supplies WV.
  • the temperature of the water W provided by the respective water supply WV does not correspond to the temperature of the water W which is to be taken up by the connected water inlet 12 .
  • Such temperature differences can arise, for example, as a result of a connection to an unsuitable water supply WV, as a result of a malfunction in the water supply WV, and/or as a result of incorrect operation of the external water supply WV.
  • control device 2 is designed to automatically control at least one monitoring sequence for the temperature of the water W supplied to the water inlet.
  • FIG 2 shows an exemplary flowchart of a washing program SP in a dishwasher 1 according to the invention, which has a water inlet 12 for receiving cold water W.
  • a monitoring sequence UES is embedded in the flushing program SP, with which limit values G OA , G OW for the temperature T W of the water W drawn from the external water supply WV are monitored.
  • the flushing program SP including the monitoring sequence UES, is shown as a flow chart, with only those program steps S1-S12 being shown and explained which are necessary for understanding the invention. Further program steps S can of course be provided. While general program steps S1, S2, S6, S7 are framed with dashed lines, the program steps S2-S5 and S8-S10 of the actual monitoring sequence UES are framed with solid lines.
  • the program SP includes a first program step S1, in which an operator calls up the washing program SP and thus starts it. This operating activity can be carried out on the operating device 3 .
  • the further program steps S of the washing program SP are now controlled automatically by the control device 2 .
  • a step S2 which now follows, the valve 13 is opened by the control device 2, so that the intake of water for the rinsing cycle begins.
  • water W passes from the valve 13 via the supply hose 14, which is fixed to the housing Connection piece 15 and other means not shown in the washing chamber 7.
  • it collects due to its weight on the bottom 17 of the washing container 5 and from there it goes on into the collection pot 18.
  • the actual monitoring sequence UES now begins, with the temperature T W being measured by the temperature sensor 24 in a step S3.
  • a measured value of the temperature T W is then supplied to the control device 2 via means that are not shown.
  • the value of the temperature T W is compared with an upper termination limit value G OA .
  • the upper termination limit value G OA is adapted to the dishwasher 1 in such a way that it cannot be damaged if the upper termination limit value G OA is not exceeded by the temperature T W .
  • the upper termination limit value G OA can have a value between 30°C and 40°C, for example.
  • step S5 is carried out after the comparison.
  • the temperature T W of the water W is compared with an upper warning value G OW .
  • the upper warning limit can have a value between 25°C and 35°C, for example. If the upper warning limit value G OW is not exceeded either, the flushing program SP is continued in a conventional manner, which is summarized as step S6.
  • the rinsing program is ended in step S7.
  • step S4 If, however, it is determined in step S4 that the temperature T W of the water W exceeds the upper termination limit value G OA , the valve 13 is closed in a step S8 and the water intake is thus terminated. In this way, short-term damage to the dishwasher 1 can be prevented.
  • the end of the water intake is communicated to the operator in a step S9 by the output of a termination message. In this way, the operator is shown the fault immediately so that he can take remedial measures without wasting any time. These measures can include checking whether the cold water inlet 12 is accidentally connected to a hot water supply WV was, or whether a connected cold water supply WV works incorrectly.
  • step S6 If the upper termination limit value G OA was not exceeded in step S4, but the upper warning limit value G OW is exceeded in step S5, a warning message is output in step S10. In this way, the operator is informed that although the temperature T W of the water W is unusually high, no short-term damage is to be feared. Caused by the warning message, the operator can determine the causes of the unusually high temperature T W of the water and, if necessary, take remedial action. In this way, damage to the dishwasher 1 that occurs only over the long term can also be avoided. However, since there is no immediate danger, after the warning message has been issued, the flushing program SP can be continued by going to step S6.
  • FIG 3 shows an exemplary flowchart of a washing program SP in a dishwasher 1 according to the invention, which has a water inlet 12 for receiving hot water W.
  • the basic process corresponds to the process described in figure 2 is shown for a dishwasher with a cold water inlet 12.
  • the values of the upper abort limit value G OA and the upper warning limit value G OW used in steps S4 and S5 are higher.
  • the upper termination limit value G OA can have a value between 60°C and 80°C and the upper warning limit value G OW can have a value between 50°C and 70°C.
  • a step S11 is provided after step S5, in which a lower warning limit value G UW with respect to the temperature T W of the water W is monitored. If the lower limit value G UW is not undershot, step S6 is carried out after step S11, so that the washing program SP is continued. However, if the lower warning limit value G UW is not reached, a further warning message is output in step S12.
  • the lower warning limit value G UW can have a value between 30°C and 40°C, for example.
  • the warning message output in step S12 can alert the operator that the hot water inlet 12 may be accidentally on a cold water supply WV has been connected, or that there is a fault in a connected hot water supply WV.
  • the invention relates to a dishwasher 1 which has a cold water inlet 12 which is provided for connection to a cold water supply WV. If such a dishwasher 1 is connected to a hot water supply WV, the operator is not informed of this error in known dishwashers.
  • the control device of the dishwasher can be used to monitor in particular whether one or more components of the dishwasher that are specifically designed or prepared for cold water are actually supplied with cold water in a predetermined, reliable temperature range from an external water supply be supplied or whether an impermissible temperature exceeding an upper, permissible temperature limit value of the supplied water occurs, which could lead to overstressing or damage to one or more parts or components of the dishwasher, such as its water supply hose, water inlet valve, etc.
  • a control criterion is generated from the temperature monitoring of the water introduced into and/or flowing into the dishwasher, with which a remedy against a critical temperature exceeding situation that has occurred is initiated.
  • the inlet valve of the water inlet can be blocked via a corresponding control line of the control device.
  • the dishwasher is only ever operated in a non-critical temperature range with water from the respective connected water supply.
  • the device detect and report whether the dishwasher has been connected to hot water, although it is designed and approved for a cold water connection.
  • a customer or fitter connects a dishwasher designed according to the principle of the invention, which is intended for cold water, to hot water, he can now be made aware of this error.
  • Such an incorrect connection can be indicated to the customer, for example, by measuring the water temperature of the first metered amount of water entering the dishwasher and/or at the water inlet. If this is e.g. 30°C and above, it can be assumed that there is a connection to hot water and the incorrect connection of his dishwasher, which is only designed or prepared for a cold water connection, can be indicated to the customer, e.g. by a visual display or an error code.
  • the control device expediently checks whether the temperature falls below a lower limit, such as 25° C., for example.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Claims (15)

  1. Lave-vaisselle domestique (1) comprenant un dispositif de commande (2) pour commander le lave-vaisselle domestique (1) et au moins une arrivée d'eau (12) pour recevoir de l'eau pilotable par le dispositif de commande (2), qui est agencée pour être reliée à au moins une alimentation d'eau externe (WV),
    caractérisé en ce que le dispositif de commande (2) est configuré pour une commande automatique d'au moins une séquence de surveillance (UES), dans laquelle une surveillance d'une ou plusieurs valeurs limites (GOA, Gow, Guw) d'une température (Tw) de l'eau alimentée par l'alimentation d'eau externe (WV) reliée à l'arrivée d'eau (12) pilotable est effectuée,
    dans lequel la séquence de surveillance (UES) comprend une comparaison de la température (Tw) de l'eau avec une première et une deuxième valeurs limites supérieures (GOA, Gow) pour la température (Tw) de l'eau et une comparaison de la température (Tw) de l'eau avec une valeur limite inférieure (Guw) pour la température (TW) de l'eau,
    dans lequel la première valeur limite supérieure (GOA, Gow) est une valeur limite d'avertissement (Gow), et en cas de dépassement de celle-ci, une émission d'un message d'avertissement (S10, S12) est produite par des moyens d'émission (4) commandables par le dispositif de commande (2), en particulier par des moyens d'émission (4) sonores et/ou optiques, et
    dans lequel la deuxième valeur limite supérieure (GOA, Gow) est une valeur limite d'arrêt (GOA), et en cas de dépassement de celle-ci, un arrêt d'une réception d'eau (S8) est prévu.
  2. Lave-vaisselle domestique selon la revendication précédente, caractérisé en ce que la séquence de surveillance (UES) prévoit une mesure (S3) de la température (Tw) de l'eau reçue via l'arrivée d'eau (12) au moyen d'un capteur de température (24).
  3. Lave-vaisselle domestique selon la revendication 2, caractérisé en ce que la mesure (S3) est prévue durant un programme de lavage (SP) pour laver de la vaisselle lors de l'activation initiale de l'arrivée d'eau (12) pour recevoir de l'eau.
  4. Lave-vaisselle domestique selon la revendication 2 ou 3, caractérisé en ce que le capteur de température (24) est disposé en aval de l'au moins une arrivée d'eau (12).
  5. Lave-vaisselle domestique selon l'une des revendications précédentes, caractérisé en ce que la valeur limite inférieure (Guw) est une valeur limite d'avertissement (Guw), en dessous de laquelle une émission d'un message d'avertissement (S10, S12) est prévue par des moyens d'émission (4) commandables par le dispositif de commande (2), en particulier par des moyens d'émission (4) sonores et/ou optiques.
  6. Lave-vaisselle domestique selon l'une des revendications 1 à 4, caractérisé en ce que la valeur limite inférieure (Guw) est une valeur limite d'arrêt, en dessous de laquelle un arrêt de la réception d'eau (S8) est prévu.
  7. Lave-vaisselle domestique selon la revendication 4, caractérisé en ce qu'en cas d'arrêt de la réception d'eau (S8), l'émission d'un message d'arrêt (S9) est prévue par des moyens d'émission (4) commandables par le dispositif de commande (2), en particulier par des moyens d'émission (4) sonores et/ou optiques.
  8. Lave-vaisselle domestique selon l'une des revendications précédentes, caractérisé en ce que l'une des arrivées d'eau pilotables (12) est une arrivée d'eau froide, qui est agencée pour être raccordée à une alimentation d'eau froide externe, dans lequel une comparaison de la température (Tw) de l'eau alimentée à l'arrivée d'eau froide est effectuée avec la valeur limite supérieure d'avertissement (Gow) et la valeur limite supérieure d'arrêt (GOA) pour la température (Tw) de l'eau.
  9. Lave-vaisselle domestique selon la revendication 8, caractérisé en ce que la valeur limite supérieure d'avertissement (Gow) pour l'eau alimentée à l'arrivée d'eau froide a une valeur entre 25 °C et 35 °C.
  10. Lave-vaisselle domestique selon la revendication 8 ou 9, caractérisé en ce que la valeur limite supérieure d'arrêt (GOA) pour l'eau alimentée à l'arrivée d'eau froide a une valeur entre 30 °C et 40 °C.
  11. Lave-vaisselle domestique selon l'une des revendications précédentes, caractérisé en ce que l'une des arrivées d'eau pilotables (12) est une arrivée d'eau chaude, qui est agencée pour être raccordée à une alimentation d'eau chaude externe, dans lequel une comparaison de la température (Tw) de l'eau alimentée à l'arrivée d'eau chaude avec la valeur limite supérieure d'avertissement (Gow) et avec la valeur limite supérieure d'arrêt (GOA) pour la température (Tw) de l'eau est effectuée.
  12. Lave-vaisselle domestique selon la revendication 11, caractérisé en ce que la valeur limite supérieure d'avertissement (Gow) pour l'eau alimentée à l'arrivée d'eau chaude a une valeur entre 50 °C et 70 °C.
  13. Lave-vaisselle domestique selon la revendication 11 ou 12, caractérisé en ce que la valeur limite supérieure d'arrêt (GOA) pour l'eau alimentée à l'arrivée d'eau chaude a une valeur entre 60 °C et 80 °C.
  14. Lave-vaisselle domestique selon l'une des revendications 11 à 13, caractérisé en ce qu'une comparaison de la température (Tw) de l'eau alimentée à l'arrivée d'eau chaude avec une valeur limite inférieure d'avertissement pour la température de l'eau (Tw) est effectuée, dans lequel la valeur limite inférieure d'avertissement a de préférence une valeur entre 30 °C et 40 °C.
  15. Procédé de fonctionnement d'un lave-vaisselle domestique (1), en particulier d'un lave-vaisselle domestique (1) selon l'une des revendications précédentes, qui comprend un dispositif de commande (2) pour une commande automatique du lave-vaisselle domestique (1) et au moins une arrivée d'eau (12) pour recevoir de l'eau pilotable par le dispositif de commande (2), dans lequel l'arrivée d'eau (12) est raccordée à au moins une alimentation d'eau externe (WV),
    caractérisé en ce qu'une ou plusieurs valeurs limites (GOA, GOW, GUW) d'une température (Tw) de l'eau alimentée par l'alimentation d'eau externe (WV) sont surveillées par le dispositif de commande (2),
    dans lequel la surveillance comprend une comparaison de la température (Tw) de l'eau avec une première et une deuxième valeurs limites supérieures (GOA, Gow) pour la température (Tw) de l'eau et une comparaison de la température (Tw) de l'eau avec une valeur limite inférieure (Guw) pour la température (Tw) de l'eau,
    dans lequel la première valeur limite supérieure (GOA, Gow) est une valeur limite supérieure d'avertissement (Gow), et en cas de dépassement de celle-ci, une émission d'un message d'avertissement (S10, S12) est produite par des moyens d'émission (4) commandables par le dispositif de commande (2), en particulier par des moyens d'émission (4) sonores et/ou optiques, et
    dans lequel la deuxième valeur limite supérieure (GOA, Gow) est une valeur limite d'arrêt (GOA), et en cas de dépassement de celle-ci, un arrêt d'une réception d'eau (S8) est prévu.
EP10173654.4A 2009-09-02 2010-08-23 Lave-vaisselle et procédé de commande correspondant Active EP2301407B1 (fr)

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CN101999875A (zh) 2011-04-06
US20110048460A1 (en) 2011-03-03
EP2301407A3 (fr) 2017-01-18
CN101999875B (zh) 2016-03-23
US8602042B2 (en) 2013-12-10
DE102009029148A1 (de) 2011-03-03
EP2301407A2 (fr) 2011-03-30

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