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
  • A47L15/42—Details
  • A47L15/50—Racks ; Baskets
  • A47L15/507—Arrangements for extracting racks, e.g. roller supports
• • 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
  • A47L2301/00—Manual input in controlling methods of washing or rinsing machines for crockery or tableware, i.e. information entered by a user
  • A47L2301/08—Other manual input
• • 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
  • 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
  • A47L2401/34—Other automatic detections
• • 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
  • A47L2501/36—Other output

Definitions

• the present invention relates to a household dishwasher.
• dishwashers The operation of household dishwashers (hereinafter also referred to as "dishwashers") is to be increasingly simplified.
• a drive mechanism moves a dishware basket, such as an upper or lower rack, out of and into the dishwasher's wash tub for loading and unloading. During this movement, the basket may become blocked by dishes, or a user may wish to stop the moving dishware basket.
• the printed matter DE 10 2005 010 616 A1 This reveals a household dishwasher with a drive designed to automatically move a dishwashing basket in and out of the wash tub. A user can also move the wash tub manually when a switching element disengages the drive from the tub.
• the printed materials WO 2018/120924 A1 and WO 2020/124970 A1 reveal a household dishwasher with a powered dishwashing basket, which is attached to a drive unit via a magnetic device. A user can stop the powered dishwashing basket and move it manually.
• the printed matter US 2008/0315739 A1 discloses an electrically driven warming drawer with a drive mechanism designed to move the warming drawer out of and into a cabinet. A user can also move the warming drawer out of the cabinet.
• the printed matter DE 10 2019 106 198 A1 The disclosure relates to a dishwasher, in particular a household dishwasher, with a wash chamber providing a wash compartment for receiving items to be cleaned, wherein the wash chamber has a loading opening for loading items, which can be closed by means of a pivotably mounted wash chamber door, with a feed opening through which items can be discharged from the wash chamber and/or into the
• the system comprises a wash carrier that can be moved into the wash chamber and an electric motor that is operatively connected to the wash carrier for moving the wash carrier.
• a spindle drive which has a threaded spindle connected to the electric motor, a sliding carriage arranged on the threaded spindle, and a drive element on the wash carrier side, wherein the drive element is detachably engaged with the sliding carriage.
• one object of the present invention is to provide an improved household dishwasher.
• a household dishwasher is provided with a wash tub and a dishwashing basket that can be moved into and at least partially out of the wash tub.
• the household dishwasher further comprises an electric motor, which has at least one motor parameter, wherein the electric motor, in a driving state, moves the dishwashing basket into or at least partially out of the wash tub and, in a free-running state, is decoupled from the dishwashing basket and/or switched to a power-free state, and/or a control unit, which regulates the electric motor, at least in the driving state, depending on at least one control parameter.
• the household dishwasher further comprises a detection unit, which is configured to detect a blockage of the dishwashing basket and/or a user's request to stop the cycle depending on the at least one control parameter and/or a motor parameter, and a switching unit, which is configured to switch the electric motor to a free-running state depending on the detected blockage or the detected request to stop the cycle.
• a detection unit which is configured to detect a blockage of the dishwashing basket and/or a user's request to stop the cycle depending on the at least one control parameter and/or a motor parameter
• a switching unit which is configured to switch the electric motor to a free-running state depending on the detected blockage or the detected request to stop the cycle.
• One aspect of the present invention is to detect a blockage in the dishwashing basket using a control parameter and/or a motor parameter. This increases the safety of the driven dishwashing basket, thereby reducing the risk of potential user injury and protecting the dishwashing basket from damage.
• a "user request to stop” refers to a user's desire to halt the dishwashing process. This desire is expressed, in particular, by the user exerting force on the dishwashing mechanism, such as applying a force directly to it. Specifically, the user can cause this force directly or indirectly.
• Direct force means that the user acts directly on the dishwashing mechanism with their hand or another part of their body.
• Indirect force means that one or more other components of the household dishwasher, such as a door, are interposed between the force exerted by the user and the dishwashing mechanism.
• the term "user request to stop” is to be understood in a broader sense as also including a user's request for a change in the movement of the dishwashing equipment.
• This change in movement encompasses, in particular, the characteristics of the dishwashing equipment's speed and direction of movement.
• a change in the dishwashing equipment's speed can mean an increase or a decrease in the user's movement speed.
• a change in the dishwashing equipment's direction of movement can mean a reversal of the user's movement.
• the user can also directly or indirectly cause the change in the dishwashing equipment's movement.
• a blockage of the dishwashing tray can occur, for example, due to dishes that have fallen over in the dishwashing tray or due to food residue or dishwashing residue that block the drive of the dishwashing tray or parts of the drive, such as gears or racks.
• control parameters refers to parameters that are controlled by the control unit, for example in a control loop, such as a position or an exit path of the dishwashing tray, or that are incorporated into the control system.
• control unit is omitted.
• the electric motor is controlled by a control unit. The detection of a blockage and/or a stop request then occurs solely based on the motor parameter.
• motor parameters refers to parameters for motor control, such as motor current, motor voltage, or motor speed.
• a “dishwashing basket” is a receptacle, in particular a basket, for holding items to be cleaned, such as plates, cups, cutlery, or bowls. Specifically, it can be an upper or lower dishwashing basket, also known as an upper and lower dish rack, or a cutlery drawer.
• a “washing container” is, in this context, a container in which one or more items to be washed can be accommodated.
• the washing container has a washing chamber in which the items are cleaned and dried.
• the washing container is preferably cuboid in shape.
• the detection unit recognizes the blockage and/or the request to stop based on a comparison of the engine parameter with a threshold value.
• the threshold value advantageously defines a switching condition, above which the electric motor is switched to free-running mode.
• a determining factor could be, for example, exceeding or falling below the threshold value.
• the threshold value has a fixed or variable value over time.
• variable value depends on the motor parameter.
• control of the electric motor includes a comparison of a target value with an actual value, wherein the control parameter is equal to the target value or the actual value and the detection unit recognizes the blockage and/or the request to stop depending on the comparison.
• the control system is clearly malfunctioning (which regularly aims to bring the actual value closer to the target value), indicating an external force, for example, in the form of a blockage or a desire to stop.
• the "comparison” specifically reveals a difference between the target value and the actual value.
• the target value is a target position and the actual value is an actual position of the dishwashing tray.
• a further parameter is determined depending on the actual position of the dishwashing tray relative to a reference position of the same.
• the reference position has a fixed or variable value over time.
• variable value of the reference position corresponds to a respective approach position of the washing material intake.
• one of the respective approach positions is half an extension length.
• a machine learning unit can be provided, which is configured to determine the threshold based on training datasets. This advantageously allows the threshold to be adapted to user behavior.
• the machine learning unit can, for example, consist of a neural network or a deep learning algorithm.
• a mechanical coupling element decouples the washing material intake from the electric motor, or the electric motor is de-energized.
• the dishware holder can be moved into or at least partially out of the dishwashing container by means of a telescopic extension, wherein the electric motor is arranged to drive an element of the telescopic extension for moving the dishware holder.
• the electric motor is a permanent magnet synchronous motor.
• control unit or detection unit can be implemented using hardware and/or software.
• the units can be implemented on a microprocessor along with associated memory.
• the microprocessor and memory can, for instance, be located on the central control unit of a household dishwasher.
• the Fig. 1 Figure 1 shows a schematic perspective view of an embodiment of a household dishwasher 1.
• the household dishwasher 1 comprises a wash tub 2, which can be closed by a door 3, in particular in a watertight manner.
• a sealing device can be provided between the door 3 and the wash tub 2.
• the wash tub 2 is preferably cuboid in shape.
• the wash tub 2 can be arranged in a housing of the household dishwasher 1.
• the wash tub 2 and the door 3 can form a wash chamber 4 for washing items.
• the door 3 is in the Fig. 1
• the door 3 is shown in its open position.
• the door 3 can be opened or closed by pivoting it about a pivot axis 5 provided at one of its lower ends.
• the door 3 can be used to open or close a loading opening 6 of the wash tank 2.
• the wash tank 2 has a base 7, a ceiling 8 opposite the base 7, a rear wall 9 opposite the closed door 3, and two opposing side walls 10, 11.
• the base 7, ceiling 8, rear wall 9, and side walls 10, 11 can, for example, be made of a It may be made of stainless steel sheet. Alternatively, for example, the base 7 could be made of a plastic material.
• the household dishwasher 1 further comprises at least one dishware holder 12 to 14.
• dishware holders 12 to 14 can be provided, wherein the dishware holder 12 can be a lower dishware holder or a lower basket, the dishware holder 13 an upper dishware holder or an upper basket, and the dishware holder 14 a cutlery drawer.
• the dishware holders 12 to 14 are arranged one above the other in the washing container 2.
• Each dishware holder 12 to 14 can be selectively moved into or out of the washing container 2.
• each dishware holder 12 to 14 can be pushed or moved into the washing container 2 in an insertion direction E (arrow) and pulled or moved out of the washing container 2 in an extraction direction A (arrow) opposite to the insertion direction E (arrow).
• the Fig. 2 Figure 1 shows a schematic side view of a household dishwasher 1.
• the dishwasher 1 has a telescopic extension 15 to which the dish holder 13 is attached.
• the dishwasher 1 also includes an electric motor 16 to drive an element 17, for example, a rail, of the telescopic extension 15.
• an electric motor 16 is in drive mode, the dish holder 13 is moved out of and into the wash tub 2.
• the electric motor 16 is operatively connected to the dish holder 13.
• a combination of gears (not shown) and racks (not shown) is provided, for example.
• the gears and racks mesh with each other and can be arranged, for example, on the dish holder 13 and/or on the telescopic extension 15.
• the dishwasher 1 has a control unit 18 (optional) which controls the electric motor 16 depending on at least one control parameter.
• the control parameter can, for example, be the position of the dish holder 13.
• the dishwasher 1 also includes a detection unit 19 to detect a blockage of the dish holder 13 or a user's request to stop the cycle. Detection is based on the control parameter or a motor parameter. Detection can also be based on The control parameter and the motor parameter are determined.
• the motor parameter is, for example, a motor current I, a motor voltage, a motor temperature, or a motor torque.
• the control parameter can, in particular, be the extension path of the dishwashing basket 13.
• the detection unit 19 can include a sensor (not shown) to detect the motor parameter.
• the dishwasher 1 also has a switching unit 20, which switches the electric motor 16 to a free-running state when the detection unit 19 detects a blockage of the dishwashing basket 13 or the user's request to stop the cycle.
• the control unit 18, the detection unit 19, and the switching unit 20 are implemented, for example, as hardware and/or software on a central control unit of the dishwasher 1 (not shown). This can be the same control unit that is also responsible for selecting and executing a particular wash program.
• the dishwashing tray 13 In the free-running state of the electric motor 16, it is not operatively connected to the dishwashing tray 13 to move it in and out. In this free-running state, the dishwashing tray 13 can be moved manually by the user in the inbound direction E (arrow) and the outbound direction A (arrow).
• a coupling element (not shown), such as a switchable freewheel, can be arranged between the electric motor 16 and the dishwashing tray 13. The coupling element connects the electric motor 16 to the dishwashing tray 13 to move it.
• the switching unit 20 Upon detection of a blockage or a request to stop, decouples the coupling element from the electric motor 16, allowing the dishwashing tray 13 to move freely.
• the free-running state of the electric motor 16 can also be achieved by disconnecting the electric motor 16 from the power supply via the switching unit 20, for which purpose the electric motor 16 can advantageously be designed as a permanent magnet synchronous motor.
• the power disconnection can be effected, for example, via a relay (not shown).
• the user's wish to stop is expressed, for example, by a force 21 (arrow) which the user applies to the dishwashing tray 13 when it is pulled out. or is driven into it.
• the force 21 (arrow) can also act on the dishwashing container 13 as a result of a blockage.
• the electric motor 16 must provide an additional force 22 (arrow) to overcome the external force 21 (arrow). To provide the force 22 (arrow), the electric motor 16 must generate a higher torque, which is achieved by increasing the motor current I of the electric motor 16.
• the Fig. 3 This shows the time course of a motor current I before and during a sustained application of the external force 21 (arrow; hereinafter also referred to as "external force 21").
• the motor current I before the external force 21 is denoted by I1
• the motor current I after the external force 21 (arrow) is denoted by I2.
• the time of the start of the external force 21 (arrow) is denoted by t1.
• the motor current I increases linearly from I1 to I2, but can also increase exponentially, for example.
• the increase of the motor current I3 continues until time t2, at which point the motor current I reaches the value I2 required to overcome the external force 21 (arrow).
• the time difference between time t2 and the start of the force t1 is denoted by t3.
• the motor current I can also dynamically vary within a current interval I4 and not follow a fixed path of the motor currents I1 and I2. This can occur, for example, due to an undetermined or unknown load on the dishwashing unit 13 or dynamic behavior during the dishwashing unit 13 process, such as during a start-up phase, as will be explained in more detail later.
• the lower limit of the motor current I within the current interval I4 is denoted by I5, while The upper limit of the motor current curve I within the current interval I4 is designated by I6.
• the Fig. 4 The figure shows a time course of the motor current I and an increase in the motor current I3 as a result of the force applied 21 (arrow).
• a fixed threshold value 23 is defined, for example, stored in a memory (not shown) of the dishwasher 1.
• the detection unit 19 ( Fig. 2 ) compares the motor current I with the threshold value 23. If the motor current I exceeds the threshold value 23, the detection unit 19 recognizes the blockage or the request to stop.
• the threshold value 23 can be adjusted to, for example, the load level of the dishwashing tray 13. If the weight of the dishwashing tray 13 is increased, a higher motor current I3' is required to move the dishwashing tray 13. To prevent the detection unit 19 from falsely detecting a blockage, the threshold value 23 is advantageously increased.
• the threshold value 23 can have a value that changes over time, as in the Fig. 5 As shown, due to an excessively rapid increase in the motor current I3" during the time difference t3, the threshold value 23 may be reduced. This is because a user request to stop or a blockage is associated with a very abrupt and therefore rapid increase in the motor current I3.
• the Fig. 5 The graph continues to show a motor current curve I with a lower rise I3′′′ and an increased threshold 23, so that an increased motor current I2' is tolerated by the detection unit 19.
• One reason for this could be, for example, the starting of the electric motor 16 and the associated increased current draw.
• the threshold 23 is defined, for example, as a function of a time derivative of the motor current I.
• a control system for the electric motor 16 includes a position control loop 24, which is located in the Fig. 6 is illustrated.
• the regulation compares A setpoint SW with an actual value IW.
• the control parameter – here the actual value DW – is adjusted by the controller to minimize the difference DW between the setpoint SW and the actual value IW.
• the setpoint SW could, for example, be a target position of the dishwashing tray 13.
• the actual value IW could, for example, be an actual position s of the dishwashing tray 13.
• the control unit 18 comprises the Fig. 2 , which derives the motor current I of the electric motor 16 from the Fig. 2
• the control loop regulates the position of the workpiece.
• the workpiece holder 13 is then extended from the wash tank 2, covering a distance s.
• the position of the workpiece holder 13 is determined, for example, via this distance s.
• the position of the workpiece holder 13 is returned to the position control loop 24 as the actual position IW or s, where it is compared with the target value SW.
• the threshold value 23 can, for example, be defined as a function of the difference DW.
• Fig. 7 The time course of a motor current I during the start-up of the dishwashing tray 13 is shown.
• the start-up phase s3 is described by a start position s1 and a final start position s2.
• the motor current I is increased.
• the threshold value 23 depends on both the motor current I and a reference position of the dishwashing tray 13.
• the reference position has a fixed or variable value over time.
• the reference position can be a position of the dishwashing tray 13 along the entire extension length 25, for example, the approach position s1, such as at half the extension length.
• the motor current I is limited by the threshold value 23.
• the threshold value 23 depends on the motor current I and the position of the dishwashing tray 13, where the position is determined by the extension path s of the dishwashing tray 13 and exhibits a similar curve to the course of the motor current I.
• the difference between The threshold value 23 and the motor current I remain constant. This difference corresponds to an additional motor current needed to overcome the external force 21 (arrow).
• the Fig. 8 shows the time course of a motor current I from the Fig. 7 upon exceeding the threshold value of 23 from the Fig. 7 during the start-up phase s3 of the dishwashing process. This allows blockages and start-up requests to be detected during the start-up phase s3.
• the Fig. 9 Figure 1 shows the steps of a procedure for operating a household dishwasher.
• a first step S1 the dish holder 13 is moved by means of the electric motor 16.
• the electric motor 16 has at least one motor parameter I and is controlled depending on at least one control parameter s.
• a second step S2 the blockage of the dish holder 13 or the user's stop request is controlled depending on the motor parameter I or the control parameter s.
• the electric motor 16 is decoupled from the dish holder 13 or switched off depending on the detected blockage or the detected stop request.
• the dishwasher 1 can have a machine learning unit (not shown) configured to determine the threshold value 23 based on training data sets.
• the threshold value 23 can, for example, be defined once or continuously with new data sets.

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• Washing And Drying Of Tableware (AREA)

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Publications (2)

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Family Applications (1)

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Family Cites Families (9)

• 2022
  • 2022-03-03 DE DE102022202168.1A patent/DE102022202168A1/de active Pending
• 2023
  • 2023-01-13 PL PL23700970.9T patent/PL4486189T3/pl unknown
  • 2023-01-13 CN CN202380025094.5A patent/CN118804705A/zh active Pending
  • 2023-01-13 US US18/836,378 patent/US20250098934A1/en active Pending
  • 2023-01-13 WO PCT/EP2023/050746 patent/WO2023165752A1/de not_active Ceased
  • 2023-01-13 EP EP23700970.9A patent/EP4486189B1/de active Active

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