EP2764816A1 - Appareil ménager doté d'un dispositif de chauffage de l'air - Google Patents

Appareil ménager doté d'un dispositif de chauffage de l'air Download PDF

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Publication number
EP2764816A1
EP2764816A1 EP14153592.2A EP14153592A EP2764816A1 EP 2764816 A1 EP2764816 A1 EP 2764816A1 EP 14153592 A EP14153592 A EP 14153592A EP 2764816 A1 EP2764816 A1 EP 2764816A1
Authority
EP
European Patent Office
Prior art keywords
heater
air flow
control device
volume flow
household
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14153592.2A
Other languages
German (de)
English (en)
Other versions
EP2764816B1 (fr
Inventor
Ralf Hochhausen
Stephan Lutz
Markus Wecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2764816A1 publication Critical patent/EP2764816A1/fr
Application granted granted Critical
Publication of EP2764816B1 publication Critical patent/EP2764816B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A47L15/0021—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
    • A47L15/0034—Drying phases, including dripping-off phases
    • 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
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/481—Drying arrangements by using water absorbent materials, e.g. Zeolith
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • 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
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • 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
    • A47L2501/12—Air blowers
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/30—Blowers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user

Definitions

  • the present invention relates to a domestic appliance, in particular a domestic dishwasher, a household washer dryer or a household dryer, with a control device for controlling a process for cleaning and / or drying of treated, with a working chamber for receiving the material to be treated during the operation, and with an air heater for heating the working chamber by means of an air flow, which comprises a fan for generating the air flow and a heater for heating the air flow.
  • a household dishwasher is known in which overheating of the air heater is prevented by means of a temperature controller.
  • the temperature controller is a so-called two-point controller that alternately switches the power supply on or off.
  • the regulation of the air heater takes place via a variable timing of the power supply.
  • the temperature controller can also be supplemented by a temperature sensor.
  • the air heater is equipped with a fuse, which permanently interrupts the voltage supply of the air heater when a critical temperature is reached by melting. To restart the household dishwasher then replacement of the fuse is required.
  • Object of the present invention is to improve a household appliance with air heater.
  • control device is designed to influence a volume flow of the air flow by influencing a speed of the fan based on a default value for the volume flow of the air flow and on the basis of an actual value of the volume flow of the air flow.
  • the domestic appliance according to the invention may in particular be a domestic dishwasher, which is provided that treated, namely ware, in particular to be washed dishes in a working chamber, also called rinsing chamber, introduced and in a single operation, which is also called rinse, with the aid of rinsing cleaned and then dried.
  • the household appliance according to the invention may be a household washing dryer, which is provided that treated, namely laundry, especially laundry to be washed, in a working chamber, also called wash chamber, introduced and in a single operation, which is also called wash, with the aid of wash liquor cleaned and then called in a further operation, also called drying cycle, in the wash chamber.
  • the household appliance according to the invention may be a household dryer, which is provided with material to be treated, namely drying material, in particular laundry to be dried, introduced into a working chamber, here also called a drying chamber, and called in one operation, also called a drying cycle the drying chamber is dried.
  • a working chamber here also called a drying chamber
  • a drying cycle the drying chamber is dried.
  • the household appliance according to the invention has a control device for the automatic control of operations of the household appliance.
  • the control device can be designed as so-called sequence control, in particular as electronic sequence control. In addition or independently, it can also perform one or more control functions as needed for control purposes.
  • it can be designed as a control unit which monitors and influences, preferably controls, the air volume flow.
  • a domestic dishwasher In the control device of the domestic dishwasher is at least one work program for performing a procedure for cleaning and / or drying items to be washed, in particular for washing dishes, deposited.
  • several work programs are provided, one of which can be selected and started by the operator. This makes it possible to adapt the sequence of an operation in particular to the load, to the type of loading, to the degree of soiling of the items to be washed and / or to the desired duration of the operation.
  • An exemplary sequence of such an operation provides for cleaning the items to be washed several sub-operations, preferably in this order a pre-rinse for pre-cleaning items, a cleaning cycle for thorough cleaning of items, an intermediate rinse for removing soiled rinse liquor from the dishes and a rinse cycle to prevent stains on Items to be washed and / or to prepare a drying cycle, in which the items to be washed are each treated with rinsing liquor.
  • These sub-operations are therefore referred to as partial water-bearing operations.
  • the exemplary sequence provides a subsequent to the water-bearing sub-operations, Spülprozabumbleden sub-operation for drying the cleaned items, namely a drying cycle, before.
  • the pre-rinse cycle is used in the example, especially the removal of coarse dirt from the dishes.
  • the purpose of the subsequent cleaning cycle is to completely remove contaminants from the items to be washed, for which purpose a rinsing liquid added with cleaning agent can be used.
  • the now performed intermediate rinse serves in particular for the removal of detergent residues, which adhere to the items to be washed.
  • the subsequent rinse cycle is 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 lime.
  • the rinsing liquid can be mixed with rinse aid during the rinse cycle.
  • a predetermined amount of liquid is introduced into the working chamber at the beginning of a water-carrying partial operation, so as to form a rinsing liquor for the respective partial operation.
  • the rinse liquor of the partial work cycle is typically removed from the working chamber at the end of the partial work cycle.
  • the temperature of the working chamber and the rinsing water therein is in many cases lower than is appropriate for the respective partial operation. Therefore, a modern household dishwasher usually has at least one heating device for heating the working chamber and the rinsing liquor.
  • such a heater is designed as a water heater, wherein the heat by direct thermal contact of a preferably electric heater, in particular by heat conduction, on the Rinse liquor is transferred and is introduced by the rinsing liquor in the working chamber.
  • a heating device designed as an air heater, in which the heat is transmitted by means of an air flow from a preferably electric heater, in particular by convection, in the working chamber and the rinsing liquor.
  • the air heater for heating the working chamber by means of an air flow of the household appliance according to the invention has a fan for generating the air flow and a heater for heating the air flow.
  • control device is designed to influence a volume flow of the air flow by influencing a rotational speed of the fan on the basis of a default value for the volume flow of the air flow and on the basis of an actual value of the volume flow of the air flow.
  • influencing is meant a controlling and / or regulatory influence.
  • volume flow of the air flow means a volume of air which is conveyed in a certain time.
  • this volume flow is influenced by the control device, in that the speed of the fan is influenced by the control device.
  • the influencing of the speed of the fan and thus the volume flow on the basis of a default value, also called setpoint, for the flow rate and an actual value, also called the actual value, the volume flow takes place.
  • a default value also called setpoint
  • an actual value also called the actual value
  • the volume flow takes place.
  • the volume flow can be regulated independently of disturbance variables to its default value, so that a sufficient heat dissipation from the heater is always guaranteed, whereby overheating of the heater is reliably prevented.
  • a reduction of the volume flow and a heater based thereon overheating due to an operator error such. B. incorrectly placed material to be treated or too large amount of treated material to be prevented.
  • the life of the heater and adjacent to the heating components of the household appliance may be extended because due to the better heat dissipation, the thermal load of the heater or the adjacent components is reduced in case of failure.
  • the air flow is guided in a closed circuit from the working chamber via the heater back into the working chamber.
  • one or more air ducts may be present from an outlet opening of the treatment chamber to the heater and from this back to an inlet opening of the treatment chamber. In this way results in an effective and efficient heating of the working chamber, since no heat is removed by means of the air flow to the outside.
  • the control device is designed to determine the default value as a function of at least one operating parameter of the household appliance.
  • a situation-specific default value for the volume flow for influencing the volume flow can be used, so that the heat balance of the household appliance can be optimized.
  • the default value can be read, inter alia, from a table stored in a memory or calculated by means of a function stored in a memory.
  • one of the operating parameters is a supply voltage supplied to the heater, which is preferably connected by means of a control device for transmitting measuring signals Voltage measuring device is measured.
  • the supply voltage is generally the voltage of an external power supply, for example, the voltage of a conventional home network, which may easily be 10% to 20% above its nominal value.
  • the supply voltage enters the power of the heater with its second power. The use of a voltage measuring device can ensure that the actual value of the supply voltage is always used to determine the default value for the volume flow.
  • one of the operating parameters is a rated power of the heater, wherein preferably the rated power is stored in the memory.
  • the rated output is understood to be the highest heat output of the heater which can be output in continuous operation.
  • the rated power is taken into account as an operating parameter, it is possible to use heaters with different power ratings in otherwise identical household appliances, without major changes must be made to the control device.
  • a faulty heater can be replaced by a heater with a different rated power.
  • the default value for the volume flow with increasing nominal power can be increased or lowered with decreasing nominal power.
  • the respective heating can be operated at its optimum operating point.
  • the rated power of the heater actually used can be stored in the control device, for example in an electronic memory or in the form of Codiersteckern or Codierschaltern.
  • one of the operating parameters is a switch-on duration of the heating, which is preferably measured by means of a time measuring device connected to the control device for transmitting measuring signals.
  • the duty cycle is the time that has elapsed from switching on the heater until the observation time. In this way it can be prevented that forms a heat accumulation with increasing duty cycle, which thermally stressed the heating and / or their environment too much.
  • the default value for the volume flow with increasing duty cycle increase.
  • the use of a time measuring device can ensure that always the actual value of the duty cycle is used to determine the default value for the flow rate.
  • the control device for detecting the actual value of the volume flow of the air flow is designed on the basis of the power consumption of the blower, which is preferably measured by means of a power measuring device connected to the control device for transmitting measuring signals.
  • the power consumption of a blower is generally a measure of the respective delivered volume flow.
  • the fan comprises an electric synchronous motor, preferably a permanent magnet synchronous motor, for example a BLDC motor or a BLAC motor, wherein preferably the speed of the synchronous motor via a control line by the control device can be predetermined .
  • a permanent magnet synchronous motor is a synchronous machine in motor operation, in which a constantly magnetized rotor is taken in synchronously by a moving magnetic rotating field in the surrounding stator.
  • the rotor comprises at least one permanent magnet.
  • a BLDC motor is a brushless, permanent-magnet DC motor
  • a BLAC motor is a brushless, permanent-magnet AC motor.
  • the advantage of a synchronous motor in the present case lies in the rigid coupling of the rotational speed to the frequency of the mono- or polyphase alternating current usually generated by means of a controllable inverter, which generates the rotating field.
  • the control device is for monitoring a difference between the default value and the actual value formed, wherein for the difference, a tolerance limit is provided, when falling below a constant maintenance of the speed of the fan is provided, and / or the difference is provided a Abschaltgrenzwert, when exceeded for at least a predetermined period of time switching off the power of the heating by the Control device is provided. It can be effected by monitoring the difference and the provision of a tolerance limit that, with a tolerable small deviation of the actual value of the volume flow of the default value of the volume flow, an adjustment of the speed is omitted. In this way, a more pleasant sound image of the current dishwasher can be achieved. In particular, a periodically increasing and decreasing noise emission can be prevented.
  • the speed can be adjusted to adjust the volume flow.
  • the tolerance limit is exceeded, the speed can be adjusted to adjust the volume flow.
  • an error message is output via an operator interface.
  • the operator interface can be assigned to the control device and can comprise indicator lamps, light-emitting diodes, an alpha-numeric display and / or a graphic display for outputting optical messages. Additionally or independently thereof, the operator interface for outputting audible messages may include a buzzer, a speaker and / or the like.
  • the air heater on a sorption with a reversibly dehydratable material which when the heater is switched off to absorb moisture from the air flow and is formed when the heater is switched on for the delivery of moisture to the air flow.
  • the invention relates to a method for operating a household appliance, in particular a domestic dishwasher, a Moswaschtrockners or a household dryer, in which by means of a control device, an operation for cleaning and / or drying of cleaning material is controlled, in which the cleaning received in a working chamber during the operation is and in which the working chamber is heated by means of an air flow of an air heater, wherein the air flow is generated (by means of a blower and heated by means of a heater.
  • a volume flow of the air flow is influenced by the control device by a speed of the blower is influenced by a default value for the volume flow of the air flow and based on an actual value of the volume flow of the air flow.
  • the inventive method allows safe operation of a household appliance with an air heater.
  • FIG. 1 shows an embodiment of a household dishwasher according to the invention 1 in a schematic side view.
  • the domestic dishwasher 1 has a rinsing chamber 2, in which items to be washed, not shown, can be cleaned by means of a rinsing liquid S during a rinse cycle.
  • the rinsing liquid S introduced into the rinsing chamber 2 collects in a sump 3, which is arranged on a lower section of the rinsing chamber 2, due to its gravitational force.
  • An example arranged on or in the sump pump 3 circulation pump 4 makes it possible to spray the rinsing liquid S via a spray system 5 in the rinsing chamber 2, so as to clean the items to be washed and / or treated in any other way.
  • the circulation pump 4 may in particular be a heating pump 4, which has a water heater for additional heating of the rinsing water.
  • an air heater 6 for heating the working chamber 2 by means of an air flow LS, which comprises a fan 7 for generating the air flow LS and a heater 8, 9 for heating the air flow LS in the embodiment ,
  • the heater 8 comprises a heating element 9 for the delivery of heat to the air flow LS. If now the fan 7 and the heater 8 are turned on, it is sucked through a suction port 10 of the washing chamber 2 air from the washing chamber 2 and as air flow LS through a first air line 11 to the fan 7, from there to the heating element 9 of the heater 8, through which he is heated, and from there through a second air line 12 via an exhaust port 13 back into the washing chamber 2.
  • the air stream releases heat, so that the rinsing chamber 2 and the rinsing bath S are heated.
  • the air flow LS is guided in a closed circuit from the washing chamber 2 via the heater 8 back into the washing chamber 2. In this way results in an effective and efficient heating of the washing chamber 2 and the rinsing liquor LS, since by means of the air flow LS no heat is removed to the outside.
  • the dishwasher 1 also has a control device 14 for the automatic control of operating sequences of the domestic dishwasher 1.
  • the control device 14 can be designed as a so-called sequence control, in particular as an electronic sequence control 14. In addition or independently, it can also perform control functions.
  • At least one wash program for controlling a wash cycle for washing items to be washed, in particular for washing dishes, is stored in the control device 14.
  • several wash programs are provided, one of which can be selected and started by the operator. This makes it possible to adjust the sequence of a rinse cycle in particular to the load, to the type of loading, to the degree of soiling of the items to be washed and / or to the desired duration of the rinse cycle.
  • the domestic dishwasher 1 of the embodiment has an electrical connection line 15, which is for connecting the domestic dishwasher 1 to an external power supply SV is provided.
  • the connecting line 15 is connected to a plurality of supply lines 16, 17, which are in turn connected to at least one electrical load of the household dishwasher.
  • a first supply line 16 supplies the blower 7 with electrical energy during operation of the domestic dishwasher 1.
  • a second supply line 17 supplies the heater 8 with electrical energy during operation of the domestic dishwasher 1. It goes without saying that even more, not shown supply lines can be present.
  • the rotational speed of the fan 7 in the exemplary embodiment can be influenced by the control device 14, preferably via a first control line 18.
  • a control signal ST can be provided, which can be transmitted from the control device 14 to the blower 7 via the control line 18.
  • control device 14 is assigned a preferably electronic memory 19, which is preferably connected to the control device 14 via a first data line 20 for data exchange.
  • preset value values VW for the volume flow of the air flow LS in the form of tables or functions and a nominal power PN of the heater 8 can be stored in the memory, which are then transferable to the control device 14.
  • the exemplary domestic dishwasher 1 comprises a power measuring device 21 for measuring the power consumption, in particular electrical power consumption, of the blower 7, which may be designed, for example, as a current measuring device 21, which is provided for measuring the current in the first supply line 16.
  • the power consumption of the blower 7 is a measure of the actual volume flow TW of the air flow LS.
  • the measured actual volume flow TW can preferably be transmitted by the power measuring device 21 to the control device 14 via a first measuring line 22.
  • the domestic dishwasher 1 of the exemplary embodiment has a voltage measuring device 23 for measuring the supply voltage UV of the heater 8.
  • the measured supply voltage UV is for example via a second measuring line 24 to the control device 14 transferable.
  • the dishwashing machine 1 of the exemplary embodiment has a time measuring device 25 for measuring the switch-on duration TE of the heater 8.
  • the measured switch-on duration TE can be transmitted to the control device 14 via a third measuring line 26, for example.
  • the exemplary domestic dishwasher 1 comprises a second control line 27, which is provided for influencing the heater 8 by the control device 14.
  • the air heater 6, a sorption 28 with a reversibly dehydratable material 29, which is formed with the heater 8 to absorb moisture from the air flow LS and switched on heater 8 for emitting moisture to the air flow LS.
  • desorption of the sorption device 22 can take place by switching on the heater 8 of the air heating device 6 and the fan 7.
  • This results in a heated air flow LS on the one hand receives moisture from the sorption 21 and on the other hand for heating the rinsing chamber 2 and the rinsing S, for example, the rinsing S of a cleaning cycle, can be used.
  • an excellent drying result can be achieved, and at the same time the waste heat can be usefully used in desorbing the sorption device 21, so that the energy consumption of the household dishwasher 1 is reduced.
  • the domestic dishwasher 1 of the embodiment has an operating interface 30, which for displaying optical messages display lamps, LEDs, an alpha-numeric display and / or a graphical Display and / or for the output of acoustic messages may have a buzzer, a speaker and / or the like.
  • the user interface 30 is connected to the control device 14 via a third data line 31, so that it can be influenced by the control device 14.
  • control device 14 is designed to influence a volumetric flow of the airflow LS by influencing a rotational speed of the fan 7 on the basis of a preset value VW for the volumetric flow of the airflow LS and on the basis of an actual value TW of the volumetric flow of the airflow LS.
  • this volume flow is influenced by the control device 14 in that the speed of the fan 7 is influenced by the control device 14 via the first control line 18.
  • the influencing of the rotational speed of the fan 7 and thus of the volume flow on the basis of a default value VW, also called desired value VW, for the volume flow and an actual value TW, also called actual value TW, the volume flow.
  • a closed loop can result, wherein the actual value TW of the volume flow is the controlled variable, the default value VW for the volume flow, the reference variable and the speed of the fan 7 is the manipulated variable.
  • the volume flow can be regulated independent of disturbance variables to its default value VW, so that a sufficient heat dissipation from the heater 8 is always ensured, whereby overheating of the heater 8 is reliably prevented.
  • a reduction of the volume flow and based on overheating of the heater 8 due to an operator error such. B. incorrectly placed material to be treated or too large amount of treated material to be prevented.
  • the life of the heater 8 and adjacent to the heater 8 components of the household appliance 1 may be extended because due to the better heat dissipation, the thermal load of the heater 8 and the adjacent components is reduced in case of failure.
  • the air flow LS is guided in a closed circuit from the working chamber 2 via the heater 8 back into the working chamber 2. In this way results in an effective and efficient heating of the working chamber 2, since by means of the air flow LS no heat is removed to the outside.
  • control device 14 is designed to determine the default value VW as a function of at least one operating parameter UV, PN, TE of the household appliance 1. In this way, a situation-specific default value VW for the volume flow for influencing the volume flow can be used, so that the heat balance of the household appliance 1 can be optimized.
  • the default value VW can be read from among other things from a table stored in a memory 19 or calculated by means of a stored in a memory 19 function.
  • one of the operating parameters UV, PN, TE is a supply voltage UV supplied to the heater 8, which is preferably measured by means of a voltage measuring device 23 connected to the control device 14 for transmitting measuring signals.
  • a voltage measuring device 23 connected to the control device 14 for transmitting measuring signals.
  • the supply voltage UV is generally the voltage of an external power supply SV, for example the voltage of a conventional home network, which may easily be 10% to 20% above its nominal value.
  • the supply voltage UV enters the power of the heater 8 with its second power.
  • the use of a voltage measuring device 23 can ensure that the actual value of the supply voltage UV is always used for determining the preset value VW for the volume flow.
  • one of the operating parameters UV, PN, TE is a rated power PN of the heater 8, wherein preferably the nominal power PN is stored in the memory 23.
  • the nominal power PN is understood to be the highest output in continuous operation heat output of the heater 8.
  • the rated power PN is considered as operating parameters UV, PN, TE, it is possible to use 1 heaters 8 with different nominal power PN for otherwise identical household appliances without major changes must be made to the controller 14.
  • a defective heater 8 can be exchanged for a heater 8 with a different nominal power PN.
  • the default value VW for the volume flow with increasing nominal power PN can be increased or lowered with decreasing nominal power PN.
  • the respective heater 8 can be operated at its optimum operating point.
  • the nominal power PN of the actually used heater 8 can be deposited in or on the control device 14, for example in an electronic memory 23 or in the form of coding plugs or coding switches.
  • one of the operating parameters UV, PN, TE is a switch-on time or switch-on time duration and thus heating duration TE of the heater 8, which is preferably measured by means of a time measuring device 25 connected to the control device 14 for transmitting measuring signals.
  • the duty cycle or heating time TE is the time that has elapsed from switching on the heater 8 to the observation time. In this way it can be prevented that with increasing duty cycle TE forms a heat accumulation, which thermally stresses the heater 8 and / or their surroundings too much.
  • the default value VW for the volume flow with increasing duty cycle TE can be increased.
  • the use of a time measuring device 25 can ensure that always the actual value of the duty cycle TE is used to establish the default value VW for the volume flow.
  • the control device 14 is designed to detect the actual value TW of the volume flow of the air flow LS on the basis of the power consumption of the blower 7, which is preferably measured by means of a power measuring device 21 connected to the control device 14 for transmitting measurement signals.
  • the power consumption of a blower 7 is generally a Measure for the respective delivered volume flow. The use of this knowledge makes it possible to dispense with a direct measurement of the volume flow, for example by means of an impeller. As a result, the structural design of the household appliance 1 can be kept simple and at the same time a reliable detection of the volume flow can be ensured.
  • the blower 7 comprises an electric synchronous motor, preferably a permanent-magnet synchronous motor, for example a BLDC motor or a BLAC motor, wherein preferably the speed of the synchronous motor via a control line 18 by the control device 14 can be predetermined.
  • An electric synchronous motor is a synchronous machine in engine operation in which a magnetizer which is constantly magnetized is driven synchronously by a moving magnetic rotating field in the surrounding stator.
  • the rotor comprises at least one permanent magnet.
  • a BLDC motor is a brushless, permanent-magnet DC motor
  • a BLAC motor is a brushless, permanent-magnet AC motor.
  • the advantage of a synchronous motor in the present case lies in the rigid coupling of the rotational speed to the frequency of the mono- or polyphase alternating current usually generated by means of a controllable inverter, which generates the rotating field.
  • FIG. 2 shows a representation of a control loop of the dishwasher of FIG. 1
  • the control device 14 is designed as a controller such that it from the memory 19 supplied as a reference variable default value VW for the flow rate VS and from the fed it from the power meter 21 as a controlled variable actual value TW of the flow rate VS a control signal ST to place the speed DZ of the blower 7, which represents the manipulated variable of the control loop generates.
  • the flow rate VS results from the rotational speed DZ of the blower 7 and from the marginal conditions acting as disturbance variables SG, such as an adjustment of the suction opening 10 and / or the blow-out opening 13 with items to be washed or other items by the operator.
  • the volume flow VS of the air flow LS changes. This is detected by the power measuring device 21, so that the actual value TW of the volume flow VS transmitted to the control device likewise changes. Now, at least when the volume flow VS changes to an intolerable degree, the control device 14 can adjust the control signal SG, so that the volume flow VS again assumes a tolerable actual value TW.
  • the control device 14 is designed to monitor a difference DI from the default value VW and the actual value TW, wherein a tolerance limit value TGW is provided for the difference DI, below which a constant maintenance of the speed DZ of the blower 7 is provided, and / or for the difference DI is a switch-off limit value AGW is provided, when exceeding this for at least a predetermined minimum period of time, a shutdown of the power of the heater 8 is provided by the control device 14.
  • the heater 8 and / or adjacent areas of the heater 8 and / or temperature-sensitive material to be treated in the working chamber 2 does not overheat even if the intended flow rate VS for a predetermined period of time can not be achieved because, for example, the loading of the working chamber 2 was carried out improperly and the air flow LS brakes too much.
  • the minimum predefinable time period is determined by the reaction time of the control device 14 and can be very close to zero.
  • the speed DZ is the speed DZ and thus the actual value TW of the volume flow VS starting from zero increased until the difference DI falls below the tolerance limit TGW. Then the speed and thus the flow rate VS is kept constant.
  • the preset value VW, the tolerance limit value TWG and the switch-off limit value are constant over time. However, it could also be provided that these values are variable over time. In particular, the default value VW could be increased over time in order to prevent that forms with increasing duty cycle ET of the heater 8, a heat accumulation, which thermally stressed the heater 8 and / or their surroundings too much. would, which is not shown, for example, by improper loading of the dishwasher 1, the difference DI run for a predetermined period above the Abschaltgrenzhongs AGW, then the power of the heater 8 would be turned off.
  • an output of an error message preferably takes place via an operator interface 30.
  • the operator can promptly take measures to eliminate a possible fault. For example, it may be prompted to remove material to be treated, which hinders the airflow LS excessively.
  • the operator interface 30 may be associated with the controller 14 and include display lamps, LEDs, an alpha-numeric display, and / or a graphical display for outputting optical messages. Additionally or independently thereof, the operator interface 30 for outputting audible messages may include a buzzer, a speaker, and / or the like.
  • the core of the invention is to equip the fan 7 of the drying system with a volume flow control.
  • the specification for this regulation is a nominal volume flow, which depends on the heating time or on-time TE, heating capacity PN and mains voltage can be UV.
  • the system is operated at the optimum operating point.
  • the actual volumetric flow can be detected via the PMSM (Permanent Magnet Excited Synchronous Motor).
  • the manipulated variable in the control loop can be the motor speed of the PMSM.
  • the different required volume flow rates as a function of the mains voltage can be stored in a look-up table or a function.
  • the heater 8 can not be switched on at all or, if it is already switched on, be switched off.
EP14153592.2A 2013-02-08 2014-02-03 Appareil ménager doté d'un dispositif de chauffage de l'air et son procédé d'operation Active EP2764816B1 (fr)

Applications Claiming Priority (1)

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DE102013202103.8A DE102013202103A1 (de) 2013-02-08 2013-02-08 Haushaltsgerät mit einer Luftheizeinrichtung

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3366830A1 (fr) * 2017-02-24 2018-08-29 LG Electronics Inc. Appareil de traitement de linge et son procédé de commande

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017223266A1 (de) 2017-07-18 2019-01-24 BSH Hausgeräte GmbH Geschirrspülmaschine mit zumindest einer Lufttrocknungseinrichtung

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP1544342A2 (fr) * 2003-12-18 2005-06-22 Lg Electronics Inc. Machine à laver avec une fonction de sèche-linge et procédé de commande correspondant
DE102008049034A1 (de) * 2008-09-25 2010-04-01 Curtius, Fritz Ablufttrockner
US20110010961A1 (en) * 2009-07-16 2011-01-20 Emerson Electric Co. Dryer Motor and Control

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Publication number Priority date Publication date Assignee Title
DE102008056412A1 (de) * 2008-11-07 2010-05-12 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit einer Luft-Trocknungsvorrichtung und/oder Flüssigkeits-Heizungseinrichtung sowie zugehöriges Verfahren
DE102011003955A1 (de) * 2011-02-10 2012-08-16 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine sowie Verfahren zum Betreiben derselben

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP1544342A2 (fr) * 2003-12-18 2005-06-22 Lg Electronics Inc. Machine à laver avec une fonction de sèche-linge et procédé de commande correspondant
DE102008049034A1 (de) * 2008-09-25 2010-04-01 Curtius, Fritz Ablufttrockner
US20110010961A1 (en) * 2009-07-16 2011-01-20 Emerson Electric Co. Dryer Motor and Control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3366830A1 (fr) * 2017-02-24 2018-08-29 LG Electronics Inc. Appareil de traitement de linge et son procédé de commande

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DE102013202103A1 (de) 2014-08-14

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