EP2187797B1 - Method for the operation of a dishwasher - Google Patents

Method for the operation of a dishwasher Download PDF

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Publication number
EP2187797B1
EP2187797B1 EP08803202.4A EP08803202A EP2187797B1 EP 2187797 B1 EP2187797 B1 EP 2187797B1 EP 08803202 A EP08803202 A EP 08803202A EP 2187797 B1 EP2187797 B1 EP 2187797B1
Authority
EP
European Patent Office
Prior art keywords
motor
drive
rotation
reversing device
dishwasher
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.)
Active
Application number
EP08803202.4A
Other languages
German (de)
French (fr)
Other versions
EP2187797A1 (en
Inventor
Bernd Heisele
Stephan Lutz
Michael Rosenbauer
Franz-Josef Wagner
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.)
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Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2187797A1 publication Critical patent/EP2187797A1/en
Application granted granted Critical
Publication of EP2187797B1 publication Critical patent/EP2187797B1/en
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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
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms
    • 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
    • A47L2501/03—Water recirculation, e.g. control of distributing valves for redirection of water flow
    • 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
    • A47L2501/04—Water pressure or flow rate
    • 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 invention relates to a method for operating a dishwasher.
  • the DE 198 57 101 B4 discloses a dishwasher with a washing container, a circulating pump, two arranged in the washing spray arms, which can be supplied by the circulation pump with liquid, a circulation pump downstream water heater and a reversing device.
  • the reversing device is controlled by a motor having a drive such that in each case one of the spray arms, none of the spray arms or both spray arms are supplied with the liquid.
  • a microswitch for controlling the drive can detect the position of the reversing device.
  • the publication EP 0 383 028 relates to a dishwasher with an electro-mechanical Um tenuvorraum, which is designed as a multi-way valve with a plurality of Lochschiebern.
  • the perforated slides are designed as rotatable by 360 ° perforated discs and independently adjustable.
  • the publication EP 1 042 982 D1 discloses a dishwasher with upper and lower spray arms, which are alternately turned on to a circulation pump by means of a shuttle valve.
  • the shuttle valve includes two valve discs, which are connected to a rotatable mounting pin and can be rotated by 90 °.
  • the object of the invention is to provide a method for operating a dishwasher, by means of which the reversing device can be brought into their positions in a relatively simple manner.
  • Another object of the invention is to provide a dishwasher that can perform this method.
  • a dishwasher comprising a rinsing container, at least two spray arms arranged within the rinsing container, a reversing device, and a drive operatively connected to the reversing device to bring the reversing device into different positions, and a control device for driving the drive and a circulating pump, which promotes depending on the adjusted position of the reversing device liquid to one of the two and / or both spray devices.
  • the control device is set up to control the drive in such a way that the changeover device initially assumes a predetermined starting position and then the changeover device assumes a specific position.
  • the dishwashing machine accordingly has the washing container and the spraying devices arranged in the washing container.
  • the spray devices are e.g. Spray arms.
  • the circulating pump conveys the liquid, which is usually referred to as rinsing liquor, to the spraying devices.
  • the dishwasher comprises the reversing device, e.g. Also referred to as water switch.
  • the switching device is e.g. connected between the circulation pump and supply lines for the spray devices.
  • the circulating pump promotes e.g. only liquid to the spray device associated with this position.
  • the reversing device has, for example, a valve body or a closing disc which closes off those inlet channels of the spraying device to which no liquid is to be delivered.
  • the reversing device has a drive to adjust the individual positions of the reversing device can.
  • the drive may comprise a motor, in particular an electric motor such as a stepper motor or other suitable drive means, such as. Electromagnets or pneumatic or hydraulic.
  • the individual positions of the Um tenuvorraum can be adjusted by turning the motor or by rotating the shaft of the motor of the electric drive By turning the motor, for example, brings the shutter disc in the desired position.
  • the Um Tavernvorraum is in the desired position, the electric motor of the drive must be rotated until the reversing device is in the desired position. So that this is possible without feedback of the current position of the reversing device to the control device, according to the invention, first of all the electric drive is controlled such that its motor brings the reversing device into the predetermined starting position.
  • the starting position can correspond, for example, to one of the positions of the reversing device.
  • the electric drive is driven, for example, by the control device such that its motor, starting from the starting position, rotates by the predetermined angle.
  • This predetermined angle is chosen such that when the reversing device is initially in its initial position and the motor has rotated by the predetermined angle, the reversing device is in the specific position.
  • a feedback that the switching device is actually in the specific position is then not necessary, which is why the dishwasher according to the invention to a corresponding feedback device, such as those from DE 198 57 101 B4 known microswitch, can do without.
  • the electric drive has e.g. in addition to the motor to a converter or inverter, which is controlled by the control device and drives the motor.
  • Inverters are well known and include e.g. suitable power components.
  • the inverter or inverter can generate an AC voltage or a three-phase voltage.
  • the zero crossings of the back emf of the motor are determined in particular by the control device while it rotates by the predetermined angle, and it becomes the electric drive in particular from the control device until a number of zero crossings of the back EMF assigned to the given angle of the motor has been determined.
  • the motor has a single-pole rotor
  • two zero crossings of the back EMF which is referred to as back emf in English
  • back emf correspond to a complete revolution of the motor, ie an angle of 2 ⁇ or 360 °.
  • the electric drive is controlled in particular by the control device such that the motor rotates in a first direction of rotation until the reversing device is in its initial position and a further rotation of the motor in the direction of blocked the first direction of rotation.
  • the reversing device comprises mechanical blocking means which prevent further rotation of the motor in the direction of its first direction of rotation when reaching the starting position.
  • Suitable blocking agents are e.g. a pawl or a hard stop.
  • the pawl has the advantage that it blocks the engine only in one direction of rotation, here in the direction of the first direction of rotation. This makes it possible to first rotate the motor in the direction of the first direction of rotation until the reversing device has reached the starting position.
  • the motor can then always be rotated in the direction of rotation different from the first direction of rotation by predetermined angles.
  • At least one operating parameter of the electric drive changes.
  • the operating parameter of the electric drive is, for example, an electrical current and / or an electrical power of the electric drive and / or a torque applied by the motor.
  • blocking the motor increases its load and therefore also its electrical current. For example, reaching a predetermined threshold current value suggests a blockage of the motor and thus the achievement of the starting position of the reversing device.
  • the electric drive is controlled in such a way that the motor rotates in the direction of the first direction of rotation until the reversing device has reached the starting position, then the electric drive can be controlled, in particular, by the control device in such a way that the motor moves by the predetermined angle in one of the first direction of rotation turns different second direction of rotation.
  • the electric drive is controlled in particular by the control device such that the motor rotates alternately in the clockwise direction and in the counterclockwise direction of rotation by the predetermined angle.
  • This variant is particularly suitable for so-called removable basket rinsing, in which the circulating pump successively conveys liquid to the individual rinsing devices.
  • the switching device is switched between two positions back and forth by the motor turns alternately clockwise and counterclockwise by the predetermined angle. As a result, a relatively fast switching between the two spray devices is possible.
  • At least one operating parameter of the electric drive is monitored while the motor rotates by the predetermined angle in order to detect a blocking of the motor. If a blocking of the engine is detected, then countermeasures are initiated. Suitable countermeasures are, for example, a lowering of the pressure of the hydraulic circuit of the dishwasher and / or a triggering of the electric drive such that the motor changes its current direction of rotation. When blocking the engine increases its load and thus the electric current or the electrical power of the electric drive. Suitable operating parameters are an electric current and / or an electric power of the electric drive.
  • the monitoring can be realized, for example, in that the control device monitors the current consumption or the power consumption of the electric drive and initiates the countermeasures when a threshold value is reached.
  • a self-healing of the dishwasher according to the invention can be achieved.
  • the electric drive for the reversing device comprises the converter or inverter, then this can also be used for a motor for driving a washer of the dishwasher, since the drain pump is not in operation when the switching device is adjusted.
  • the Fig. 1 shows a dishwasher 1 and the Fig. 2 shows a schematic diagram of the dishwasher 1, which has a washing container 2 for receiving items to be washed, eg soiled dishes and cutlery, which is classified for example in a Geschirroberkorb 3 and a dish rack 4.
  • a washing container 2 for receiving items to be washed, eg soiled dishes and cutlery, which is classified for example in a Geschirroberkorb 3 and a dish rack 4.
  • the washing container 2 at least two spray devices, which are formed in the case of the present embodiment as the upper and lower spray arms 5, 6, arranged for applying the washware with a liquid, which is commonly referred to as rinsing liquor.
  • the liquid can be conveyed by a circulation pump 7 via a first liquid supply line 8 to the upper spray arm 5 and via a second liquid supply line 9 to the lower spray arm 6. This is in the Fig. 2 illustrated by arrows 21-23.
  • the circulation pump 7 is driven for example by
  • the liquid is heated, at least in a partial program step of a wash program of the dishwasher 1 by a water heater 10, which is connected to an inlet nozzle 11 to the circulation pump 7 and with outlet ports 12, 13 to the liquid supply lines 8, 9.
  • the number of outlet ports 12, 13 corresponds to the number of spray arms 5, 6 or simultaneously operated groups of spray arms 5, 6.
  • the funded by the circulation pump 7 liquid is therefore in the case of the present embodiment to the inlet nozzle 11 of the water heater 10 and the output port 12th , 13 via the liquid supply lines 8, 9 to the spray arms 5, 6 passed.
  • the electric drive 15 is connected by means of an electrical line 17 to a control device 18 of the dishwasher 1, so that the control device 18 can control the electric drive 15 in a generally known manner and optionally also regulate.
  • the control device 18 includes e.g. a suitably programmed microprocessor and is generally intended to control the dishwasher 1 so that it performs the washing program.
  • the dishwasher 1 further comprises a reversing device, in particular a water diverter 14, which, e.g. arranged in the flow heater 10 or is integrally formed thereon.
  • the water diverter 14 may e.g. but also be arranged in the dishwasher 1 by itself or be connected directly to the circulation pump 7.
  • the spray arms 5, 6 can be alternately and / or constantly charged with the liquid, which is achieved by opening a liquid outlet and by closing another liquid outlet of the water switch 14.
  • the liquid outlets of the water distributor 14 pass directly into the outlet ports 12, 13 or are identical to these.
  • the water diverter 14 has a liquid inlet which, in the case of the present exemplary embodiment, adjoins or is formed by the inlet connection 11. To close the liquid outlets is in the case of the present Embodiment, a valve body or a closure disc by a drive, in particular an electric drive 19, adjusted.
  • the electric drive 19 is connected to the control device 18 by means of an electrical line 20 and is controlled by the latter.
  • the electric drive 19 is designed such that its direction of rotation can be changed by appropriate activation by the control device 18.
  • the electric drive 19 comprises a BLDC or a BLAC motor 25, ie a three-phase synchronous motor, and an inverter or converter 24 controlling the motor 25.
  • the converter 24 generates the required three-phase electrical voltage for the motor 25, so the required frequency and the required effective value of the electrical voltage.
  • Suitable inverters 24 include e.g. Power semiconductors and are generally known in the art, therefore, the exact structure of the inverter 24 is not further explained.
  • the electric drive 19 moves the shutter disc of the water switch 14, which is also referred to as passing through the water switch position.
  • the water diverter 14 comprises a in the Fig. 3 shown and with respect to a rotational axis 26 rotatably mounted eccentric 27 with an eccentricity 28.
  • the motor 25 of the electric drive 19 is connected to the eccentric 27, for example via a clutch, not shown, or a transmission, not shown, or directly in operative connection, so that the motor 25, at least indirectly the eccentric 27 rotates.
  • the eccentric 27 is in turn in operative connection with the closure disk of the water switch 14, so that upon rotation of the eccentric 27 about the axis of rotation 26, the closure disk is adjusted and thus the water switch 14 occupies different positions in which the circulation pump 7, for example, only liquid to the upper spray arm. 5 or only to the lower spray arm 6 can promote.
  • the water diverter 14 also has a relative to an axis 29 mounted pawl 30 with a rigid locking pin 31, by means of which the eccentric 27 can be brought into a predetermined starting position, in which the eccentricity 28 is aligned in a predetermined starting position.
  • This position is in the Fig. 3 shown and corresponds to the starting position of the water switch 14.
  • the starting position corresponds in particular to a position of the water distributor 14, in which the circulation pump 7 conveys only liquid to one of the spray arms 5. 6, for example to the upper spray arm 5.
  • the pawl 30 is arranged so that upon rotation of the eccentric 27 in the clockwise direction, i. in the direction of an arrow 33, the eccentric 27 and its eccentricity 28, the pawl 30 with respect to the axis 29 can rotate away.
  • the motor 25, the eccentric 27 rotate arbitrarily in the clockwise direction.
  • This increases the counter-torque or the load of the motor 25, whereby the electric current of the electric drive 19 increases.
  • the controller 18, e.g. compares the electric current of the electric drive 19 with a predetermined threshold, and stops the electric drive 19.
  • the water gate 14 is in its predetermined starting position.
  • control device 18 optionally controls the electric drive 19 such that its electric motor 25 rotates in a second direction of rotation, so that the eccentric 27 rotates in the clockwise direction.
  • the liquid outlets of the water switch 14 such that in the case of the present embodiment in particular the circulating pump 7 conveys liquid either to the upper spray arm 5 or only to the lower spray arm 6.
  • the positions of the closure disk of the water switch 14 correspond to positions of the eccentric 27. These are set in the case of the present embodiment such that starting from the preset initial position of the water switch 14, the control device 18 controls the electric drive 19 such that its motor 25 in his second direction of rotation rotates by a predetermined angle. The motor 25 thereby rotates the eccentric 27 accordingly by a predetermined angle in the clockwise direction, whereby the desired positions of the water distributor 14 set. Thus, it is only necessary that the control device 18 controls the electric drive 19 during the wash program such that its motor 25, starting from the starting position, rotates by predetermined angle with respect to the second direction of rotation.
  • the predetermined angles due to the zero crossings of the back EMF (English: Back emf) of the motor 25 of the electric drive 19 are detected.
  • the motor 25 comprises a single-pole rotor, as provided in the present embodiment, then two zero crossings of the back EMF correspond to one complete revolution of the motor 25.
  • the zero crossings of the back EMF of the motor 25 necessary for the desired rotation of the motor 25 in its second direction of rotation are e.g. stored in a memory, not shown, of the control device 18.
  • the controller 18 may rotate it by the predetermined angle due to measured zero crossings of the back EMF of the motor 25 to bring the water gate 14 and its shutter disc to the desired positions, respectively.
  • the dishwasher 1 it is provided to operate the dishwasher 1 in the so-called change basket washing mode, at least in a partial washing program step. In this operating mode, only one of the two spray arms 5, 6 is alternately charged with liquid. If the dishwasher 1 is in the change-over washing mode, then the control device 18 controls the electric drive 19 such that its motor 25 initially from its initial position, which corresponds in the case of the present embodiment, the position of the water switch 14, in which the circulating pump 7 promotes only liquid to the upper spray arm 5, rotates at the predetermined angle in the clockwise direction to the To bring water diverter 14 in a position in which the circulation pump 7 promotes only liquid to the lower spray arm 5.
  • control device 18 controls the electric drive 19 such that the motor 25 rotates in the counterclockwise direction of rotation by the predetermined angle, whereby the water switch 14 is brought back into the position in which the circulation pump 7 only liquid to the upper spray arm. 5 promotes. This is repeated as many times as desired.
  • the electric drive 19 starting from the initial position controls such that its first motor 25 rotates from its initial position by the predetermined angle in the clockwise direction to bring the water distributor 14 in a position, in which the circulation pump 7 promotes only liquid to the lower spray arm 5.
  • the control device 18 controls the electric drive 19 such that the motor 25 continues to rotate in the clockwise direction by a further predetermined angle to bring the water switch 14 back into the position in which the circulation pump 7 only liquid to the upper Spray arm 5 promotes. Since the eccentric 27 is not blocked by the pawl 30, when the motor 25 rotates in the clockwise direction, this program can be repeated as desired of any.
  • the control device 18 monitors the magnitude of the electrical current of the electric drive 19, for example its effective value. If the motor 25 is blocked due to a too high counter-torque on the shutter disk, for example because a foreign body obstructs or blocks the movement of the shutter disk, then the electric current of the electric drive increases. Thus, it is possible, due to monitoring of the electrical current of the electric drive 19 to conclude an inadmissible operating state, so that, for example, the control device 18 can initiate appropriate countermeasures. Suitable countermeasures are, for example, a lowering of the pressure in the hydraulic circuit of the dishwasher 1 or a triggering of the electric drive 19 such that it changes its current direction of rotation. The monitoring of the electric current For example, it can be realized such that the control device 18 compares the effective value of the electric current with a predetermined maximum value and initiates the countermeasures when the effective value of the electric current exceeds the maximum value.
  • the Fig. 4 shows a part of an alternative water diverter 14a, which can be used instead of the water diverter 14 for the dishwasher 1.
  • the water switch 14 a differs substantially from the water switch 14 in that the water switch 14 a no pawl 30, but has a stationary fixed stop 32.
  • the eccentric 27 can perform substantially only one full revolution.
  • the control device 18 in the case of the present embodiment e.g. at the beginning of a washing program or a program step of the washing program, the control device 18, the electric drive 19 so that the motor 25 rotates in its first rotational direction, whereby the eccentric 27 rotates counterclockwise rotation until it stops the hard stop 32.
  • the control device 18 due to the increasing electric current of the electric drive 19 and stops it.
  • the water diverter 14a is in its predetermined starting position, in the e.g. the circulation pump can only convey liquid to the upper spray arm 5.
  • control device 18 optionally controls the electric drive 19 such that its electric motor 25 first rotates in its second direction of rotation, so that the eccentric 27 rotates in the clockwise direction until the eccentric 27 occupies another position of the water switch 14 a, in the circulating pump 7, for example can only promote fluid to the lower spray arm 6.
  • the required angle of the motor 25 to be traversed is determined by the control device 18 on the basis of predetermined zero crossings of the back EMF of the motor 25 of the electric drive 19.
  • the control device 18, the electric Drive 19 for an adjustment of the water gate 14a such that its motor 25 optionally changes its direction of rotation and rotates in the changed direction of rotation, for example by a further predetermined angle.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Geschirrspülmaschine.The invention relates to a method for operating a dishwasher.

Die DE 198 57 101 B4 offenbart eine Geschirrspülmaschine mit einem Spülbehälter, einer Umwälzpumpe, zwei im Spülbehälter angeordneten Sprüharmen, die mittels der Umwälzpumpe mit Flüssigkeit versorgt werden können, einem der Umwälzpumpe nachgeschalteten Durchlauferhitzer und einer Umsteuereinrichtung. Die Umsteuereinrichtung wird von einem einen Motor aufweisenden Antrieb derart angesteuert, dass jeweils einer der Sprüharme, keiner der Sprüharme oder beide Sprüharme mit der Flüssigkeit versorgt werden. Ein Mikroschalter zum Steuern des Antriebs kann die Stellung der Umsteuereinrichtung erkennen.The DE 198 57 101 B4 discloses a dishwasher with a washing container, a circulating pump, two arranged in the washing spray arms, which can be supplied by the circulation pump with liquid, a circulation pump downstream water heater and a reversing device. The reversing device is controlled by a motor having a drive such that in each case one of the spray arms, none of the spray arms or both spray arms are supplied with the liquid. A microswitch for controlling the drive can detect the position of the reversing device.

Die Druckschrift EP 0 383 028 betrifft eine Geschirrspülmaschine mit einer elektromechanischen Umsteuervorrichtung, welche als ein Mehrwegeventil mit einer Mehrzahl von Lochschiebern ausgebildet ist. Die Lochschieber sind als um 360° drehbare Lochscheiben ausgebildet und unabhängig voneinander verstellbar.The publication EP 0 383 028 relates to a dishwasher with an electro-mechanical Umsteuervorrichtung, which is designed as a multi-way valve with a plurality of Lochschiebern. The perforated slides are designed as rotatable by 360 ° perforated discs and independently adjustable.

Die Druckschrift EP 1 042 982 D1 offenbart einen Geschirrspüler mit oberen und unteren Sprüharmen, welche im Wechsel an eine Umwälzpumpe mittels eines Wechselventils angeschaltet werden. Das Wechselventil umfasst zwei Ventilscheiben, welche mit einem drehbaren Montagestift verbunden sind und jeweils um 90° gedreht werden können.The publication EP 1 042 982 D1 discloses a dishwasher with upper and lower spray arms, which are alternately turned on to a circulation pump by means of a shuttle valve. The shuttle valve includes two valve discs, which are connected to a rotatable mounting pin and can be rotated by 90 °.

Aufgabe der Erfindung ist es, ein Verfahren zum Betreiben einer Geschirrspülmaschine anzugeben, mittels dem die Umsteuereinrichtung in relativ einfacher Weise in ihre Stellungen gebracht werden kann.The object of the invention is to provide a method for operating a dishwasher, by means of which the reversing device can be brought into their positions in a relatively simple manner.

Eine weitere Aufgabe der Erfindung ist es, eine Geschirrspülmaschine anzugeben, die dieses Verfahren ausführen kann.Another object of the invention is to provide a dishwasher that can perform this method.

Die Aufgabe der Erfindung wird gelöst durch die Merkmale der unabhängigen Ansprüche. Vorteilhafte Weiterbildungsformen sind Gegenstand der abhängigen Ansprüche.The object of the invention is achieved by the features of the independent claims. Advantageous forms of further education are the subject of the dependent claims.

Die weitere Aufgabe der Erfindung wird gelöst durch eine Geschirrspülmaschine, aufweisend einen Spülbehälter, wenigstens zwei innerhalb des Spülbehälters angeordnete Sprüharme, eine Umsteuervorrichtung, und einen mit der Umsteuereinrichtung in Wirkverbindung stehenden Antrieb, um die Umsteuervorrichtung in verschiedene Stellungen zu bringen, sowie eine Steuervorrichtung zum Ansteuern des Antriebs und eine Umwälzpumpe, die je nach eingestellter Stellung der Umsteuervorrichtung Flüssigkeit zu einer der beiden und/oder zu beiden Sprühvorrichtungen fördert. Die Steuervorrichtung ist eingerichtet, den Antrieb derart anzusteuern, dass die Umsteuervorrichtung zunächst eine vorgegebene Ausgangsstellung einnimmt und anschließend die Umsteuervorrichtung eine bestimmte Stellung einnimmt.The further object of the invention is achieved by a dishwasher, comprising a rinsing container, at least two spray arms arranged within the rinsing container, a reversing device, and a drive operatively connected to the reversing device to bring the reversing device into different positions, and a control device for driving the drive and a circulating pump, which promotes depending on the adjusted position of the reversing device liquid to one of the two and / or both spray devices. The control device is set up to control the drive in such a way that the changeover device initially assumes a predetermined starting position and then the changeover device assumes a specific position.

Die erfindungsgemäße Geschirrspülmaschine weist demnach den Spülbehälter und die im Spülbehälter angeordneten Sprühvorrichtungen auf. Die Sprühvorrichtungen sind z.B. Sprüharme. Im Betrieb der Geschirrspülmaschine fördert die Umwälzpumpe die Flüssigkeit, die üblicherweise als Spülflotte bezeichnet wird, zu den Sprühvorrichtungen. Je nach Spülprogramm kann es z.B. vorgesehen sein, insbesondere abwechselnd nur einen der Sprühvorrichtungen oder Gruppen von Sprühvorrichtungen mit der Flüssigkeit zu versorgen. Damit die Umwälzpumpe die Flüssigkeit zu den gewünschten Sprühvorrichtungen fördern kann, umfasst die erfindungsgemäße Geschirrspülmaschine die Umsteuervorrichtung, die z.B. auch als Wasserweiche bezeichnet wird. Die Umsteuervorrichtung ist z.B. zwischen der Umwälzpumpe und Zulaufleitungen für die Sprühvorrichtungen geschaltet. Je nach Stellung der Umschaltvorrichtung fördert die Umwälzpumpe z.B. nur Flüssigkeit zu der dieser Stellung zugeordneten Sprühvorrichtung.The dishwashing machine according to the invention accordingly has the washing container and the spraying devices arranged in the washing container. The spray devices are e.g. Spray arms. During operation of the dishwasher, the circulating pump conveys the liquid, which is usually referred to as rinsing liquor, to the spraying devices. Depending on the washing program, it may be e.g. be provided, in particular to provide alternately only one of the spray devices or groups of spray devices with the liquid. In order for the circulation pump to be able to deliver the liquid to the desired spraying devices, the dishwasher according to the invention comprises the reversing device, e.g. Also referred to as water switch. The switching device is e.g. connected between the circulation pump and supply lines for the spray devices. Depending on the position of the switching device, the circulating pump promotes e.g. only liquid to the spray device associated with this position.

Die Umsteuervorrichtung weist z.B. einen Ventilkörper oder eine Verschlussscheibe auf, der bzw. die diejenigen Zulaufkanal der Sprühvorrichtung verschließt, zu der keine Flüssigkeit gefördert werden soll. Die Umsteuereinrichtung weist einen Antrieb auf, um die einzelnen Stellungen der Umsteuereinrichtung einstellen zu können. Der Antrieb kann einen Motor, insbesondere eine Elektromotor wie bspw. einen Schrittmotor umfassen oder andere geeignete Antriebsmittel, wie bspw. Elektromagnete oder pneumatische oder hydraulische. Die einzelnen Stellungen der Umsteuervorrichtung können durch Drehen des Motors bzw. durch Drehen der Welle des Motors des elektrischen Antriebs eingestellt werden, indem der Motor durch Drehen z.B. die Verschlussscheibe in die gewünschte Stellung bringt.The reversing device has, for example, a valve body or a closing disc which closes off those inlet channels of the spraying device to which no liquid is to be delivered. The reversing device has a drive to adjust the individual positions of the reversing device can. The drive may comprise a motor, in particular an electric motor such as a stepper motor or other suitable drive means, such as. Electromagnets or pneumatic or hydraulic. The individual positions of the Umsteuervorrichtung can be adjusted by turning the motor or by rotating the shaft of the motor of the electric drive By turning the motor, for example, brings the shutter disc in the desired position.

Damit sich die Umsteuervorrichtung in der gewünschten Stellung befindet, muss der Elektromotor des Antriebs solange gedreht werden, bis sich die Umsteuervorrichtung in der gewünschten Stellung befindet. Damit dies ohne Rückmeldung der aktuellen Stellung der Umsteuervorrichtung an die Steuervorrichtung möglich ist, wird erfindungsgemäß zunächst der elektrische Antrieb derart angesteuert, dass dessen Motor die Umsteuervorrichtung in die vorgegebene Ausgangstellung bringt. Die Ausgangsstellung kann z.B. einer der Stellungen der Umsteuervorrichtung entsprechen. Danach wird der elektrische Antrieb derart z.B. von der Steuervorrichtung angesteuert, dass sich dessen Motor, ausgehend von der Ausgangsstellung, um den vorgegebenen Winkel dreht. Dieser vorgegebene Winkel ist derart gewählt, dass wenn sich die Umsteuervorrichtung zunächst in ihrer Ausgangsstellung befindet und sich der Motor um den vorgegebenen Winkel gedreht hat, sich die Umsteuervorrichtung in der bestimmten Stellung befindet. Eine Rückmeldung darüber, dass sich die Umschaltvorrichtung tatsächlich in der bestimmten Stellung befindet, ist dann nicht notwendig, weshalb die erfindungsgemäße Geschirrspülmaschine auf eine entsprechende Rückmeldevorrichtung, wie z.B. den aus der DE 198 57 101 B4 bekannten Mikroschalter, verzichten kann. Dadurch verringert sich die Anzahl nötiger Bauteile für die erfindungsgemäße Geschirrspülmaschine, wodurch diese kostengünstiger hergestellt werden kann. Auch ist es möglich, die Positioniergenauigkeit der Umschaltvorrichtung zu erhöhen, da Schalttoleranzen des Mikroschalters entfallen.Thus, the Umsteuervorrichtung is in the desired position, the electric motor of the drive must be rotated until the reversing device is in the desired position. So that this is possible without feedback of the current position of the reversing device to the control device, according to the invention, first of all the electric drive is controlled such that its motor brings the reversing device into the predetermined starting position. The starting position can correspond, for example, to one of the positions of the reversing device. Thereafter, the electric drive is driven, for example, by the control device such that its motor, starting from the starting position, rotates by the predetermined angle. This predetermined angle is chosen such that when the reversing device is initially in its initial position and the motor has rotated by the predetermined angle, the reversing device is in the specific position. A feedback that the switching device is actually in the specific position is then not necessary, which is why the dishwasher according to the invention to a corresponding feedback device, such as those from DE 198 57 101 B4 known microswitch, can do without. This reduces the number of components required for the dishwasher according to the invention, whereby it can be produced more cheaply. It is also possible to increase the positioning accuracy of the switching device, since switching tolerances of the microswitch omitted.

Der elektrische Antrieb weist z.B. neben dem Motor einen Umrichter oder Wechselrichter auf, der von der Steuervorrichtung angesteuert wird und den Motor antreibt. Wechselrichter bzw. Umrichter sind allgemein bekannt und umfassen z.B. geeignete Leistungsbauteile. Je nach verwendetem Motor kann der Wechselrichter oder Umrichter eine Wechselspannung oder eine Dreiphasen-Spannung erzeugen.The electric drive has e.g. in addition to the motor to a converter or inverter, which is controlled by the control device and drives the motor. Inverters are well known and include e.g. suitable power components. Depending on the motor used, the inverter or inverter can generate an AC voltage or a three-phase voltage.

Um zu erkennen, wenn sich der Motor um den vorgegeben Winkel gedreht hat, werden nach einer Ausführungsform des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine insbesondere von der Steuervorrichtung die Nulldurchgänge der Gegen-EMK des Motors ermittelt, während dieser sich um den vorgegebenen Winkel dreht, und es wird der elektrische Antrieb insbesondere von der Steuervorrichtung solange angesteuert, bis eine dem vorgegebenen Winkel des Motors zugeordnete Anzahl von Nulldurchgängen der Gegen-EMK ermittelt wurde. Weist beispielsweise der Motor einen einpoligen Rotor auf, dann entsprechen zwei Nulldurchgänge der Gegen-EMK, die im Englischen als back emf bezeichnet wird, einer vollständigen Umdrehung des Motors, also einem Winkel von 2π bzw. 360°. Somit kann über ein Zählen der Nulldurchgänge der Gegen-EMK ausgehend von der Ausgangsstellung auf den Winkel geschlossen werden, um den sich der Motor gedreht hat. Demnach ist es möglich, aufgrund der Nulldurchgänge der Gegen-EMK zu schließen, wenn der Motor sich um den vorgegebenen Winkel gedreht hat.In order to detect when the engine has rotated by the predetermined angle, according to one embodiment of the method and the dishwasher according to the invention, the zero crossings of the back emf of the motor are determined in particular by the control device while it rotates by the predetermined angle, and it becomes the electric drive in particular from the control device until a number of zero crossings of the back EMF assigned to the given angle of the motor has been determined. If, for example, the motor has a single-pole rotor, then two zero crossings of the back EMF, which is referred to as back emf in English, correspond to a complete revolution of the motor, ie an angle of 2π or 360 °. Thus, by counting the zero crossings of the back EMF from the home position to the angle at which the motor has rotated. Thus, it is possible to close due to the zero crossings of the back emf, when the motor has rotated by the predetermined angle.

Gemäß einer Variante des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine wird der elektrische Antrieb insbesondere von der Steuervorrichtung derart angesteuert, dass sich der Motor in einer ersten Drehrichtung solange dreht, bis die Umsteuervorrichtung sich in ihrer Ausgangsstellung befindet und ein weiteres Drehen des Motors in Richtung der ersten Drehrichtung blockiert. Durch das Blockieren des Motors bei der Ausgangsstellung der Umsteuervorrichtung ist es möglich, relativ zuverlässig die Umsteuervorrichtung in ihre Ausgangsstellung mittels des elektrischen Antriebs zu bringen.According to a variant of the method and the dishwasher according to the invention, the electric drive is controlled in particular by the control device such that the motor rotates in a first direction of rotation until the reversing device is in its initial position and a further rotation of the motor in the direction of blocked the first direction of rotation. By blocking the engine at the starting position of the reversing device, it is possible to relatively reliably bring the Umsteuervorrichtung in its initial position by means of the electric drive.

Die Blockierung kann relativ einfach realisiert werden, wenn nach einer Ausführungsform des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine die Umsteuervorrichtung mechanische Blockiermittel umfasst, die ein Weiterdrehen des Motors in Richtung seiner ersten Drehrichtung beim Erreichen der Ausgangsstellung verhindern. Geeignete Blockiermittel sind z.B. eine Sperrklinke oder ein Festanschlag. Die Sperrklinke hat den Vorteil, dass sie den Motor nur in einer Drehrichtung, hier in Richtung der ersten Drehrichtung, blockiert. Dadurch ist es möglich, den Motor zunächst in Richtung der ersten Drehrichtung zu drehen, bis die Umsteuervorrichtung die Ausgangsstellung erreicht hat. Für das Einstellen der gewünschten Stellungen der Umsteuervorrichtung kann dann der Motor stets in der von der ersten Drehrichtung verschiedenen Drehrichtung um vorbestimmte Winkel gedreht werden.The blocking can be realized relatively simply if, according to one embodiment of the method according to the invention or the dishwasher according to the invention, the reversing device comprises mechanical blocking means which prevent further rotation of the motor in the direction of its first direction of rotation when reaching the starting position. Suitable blocking agents are e.g. a pawl or a hard stop. The pawl has the advantage that it blocks the engine only in one direction of rotation, here in the direction of the first direction of rotation. This makes it possible to first rotate the motor in the direction of the first direction of rotation until the reversing device has reached the starting position. For setting the desired positions of the reversing device, the motor can then always be rotated in the direction of rotation different from the first direction of rotation by predetermined angles.

Wenn der Motor blockiert wird, ändert sich zumindest ein Betriebsparameter des elektrischen Antriebs. Nach einer Variante des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine ist es vorgesehen, das Erreichen der Ausgangsstellung der Umsteuervorrichtung insbesondere mittels der Steuervorrichtung aufgrund wenigstens eines Betriebsparameters des elektrischen Antriebs zu erkennen und dann den elektrischen Antrieb zu stoppen. Der Betriebsparameter des elektrischen Antriebs ist z.B. ein elektrischer Strom und/oder eine elektrische Leistung des elektrischen Antriebs und/oder ein vom Motor aufgebrachtes Drehmoment. Beim Blockieren des Motors steigt dessen Last und demnach auch sein elektrischer Strom. Beispielsweise ein Erreichen eines vorgegebenen Schwellenstromwertes lässt auf ein Blockieren des Motors und somit auf das Erreichen der Ausgangsstellung der Umsteuervorrichtung schließen.When the engine is locked, at least one operating parameter of the electric drive changes. According to a variant of the method according to the invention or the dishwasher according to the invention, it is provided to reach the starting position the reversing device in particular by means of the control device due to recognize at least one operating parameter of the electric drive and then to stop the electric drive. The operating parameter of the electric drive is, for example, an electrical current and / or an electrical power of the electric drive and / or a torque applied by the motor. When blocking the motor increases its load and therefore also its electrical current. For example, reaching a predetermined threshold current value suggests a blockage of the motor and thus the achievement of the starting position of the reversing device.

Wird der elektrische Antrieb derart angesteuert, dass sich der Motor in Richtung der ersten Drehrichtung dreht, bis die Umsteuervorrichtung die Ausgangsstellung erreicht hat, dann kann der elektrische Antriebs insbesondere von der Steuervorrichtung derart angesteuert werden, dass sich der Motor um den vorgegebenen Winkel in einer von der ersten Drehrichtung verschiedenen zweiten Drehrichtung dreht.If the electric drive is controlled in such a way that the motor rotates in the direction of the first direction of rotation until the reversing device has reached the starting position, then the electric drive can be controlled, in particular, by the control device in such a way that the motor moves by the predetermined angle in one of the first direction of rotation turns different second direction of rotation.

Gemäß einer Ausführungsform des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine wird der elektrische Antrieb insbesondere von der Steuervorrichtung derart angesteuert, dass sich der Motor abwechselnd im Uhrzeigerdrehsinn und im Gegenuhrzeigerdrehsinn um den vorgegebenen Winkel dreht. Diese Variante bietet sich insbesondere beim sogenannten Wechselkorbspülen an, bei dem die Umwälzpumpe nacheinander Flüssigkeit zu den einzelnen Spülvorrichtungen fördert. Gemäß dieser Variante wird die Umschaltvorrichtung zwischen zwei Stellungen hin und her geschaltet, indem der Motor sich abwechselnd im Uhrzeigersinn und im Gegenuhrzeigersinn um den vorgegeben Winkel dreht. Dadurch ist ein relativ schnelles Wechseln zwischen den beiden Sprühvorrichtungen möglich.According to one embodiment of the method and the dishwasher according to the invention, the electric drive is controlled in particular by the control device such that the motor rotates alternately in the clockwise direction and in the counterclockwise direction of rotation by the predetermined angle. This variant is particularly suitable for so-called removable basket rinsing, in which the circulating pump successively conveys liquid to the individual rinsing devices. According to this variant, the switching device is switched between two positions back and forth by the motor turns alternately clockwise and counterclockwise by the predetermined angle. As a result, a relatively fast switching between the two spray devices is possible.

Gemäß einer Variante des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Geschirrspülmaschine wird wenigstens ein Betriebsparameters des elektrischen Antriebs überwacht während sich der Motor um den vorgegebenen Winkel dreht, um ein Blockieren des Motors zu erkennen. Wird ein Blockieren des Motors erkannt, dann werden Gegenmaßnahmen eingeleitet. Geeignete Gegenmaßnahmen sind beispielsweise ein Absenken des Drucks des Hydraulikkreislaufs der Geschirrspülmaschine und/oder ein Ansteuern des elektrischen Antriebs derart, dass der Motor seine aktuelle Drehrichtung ändert. Beim Blockieren des Motors steigt dessen Last und somit der elektrische Strom oder die elektrische Leistung des elektrischen Antriebs. Geeignete Betriebsparameter sind ein elektrischer Strom und/oder eine elektrische Leistung des elektrischen Antriebs. Die Überwachung kann z.B. dadurch realisiert werden, dass die Steuervorrichtung die Stromaufnahme oder die Leistungsaufnahme des elektrischen Antriebs überwacht und beim Erreichen eines Schwellwerts die Gegenmaßnahmen einleitet. Somit kann zumindest in gewissen Grenzen eine Selbstheilung der erfindungsgemäßen Geschirrspülmaschine erreicht werden.According to a variant of the method according to the invention or the dishwasher according to the invention, at least one operating parameter of the electric drive is monitored while the motor rotates by the predetermined angle in order to detect a blocking of the motor. If a blocking of the engine is detected, then countermeasures are initiated. Suitable countermeasures are, for example, a lowering of the pressure of the hydraulic circuit of the dishwasher and / or a triggering of the electric drive such that the motor changes its current direction of rotation. When blocking the engine increases its load and thus the electric current or the electrical power of the electric drive. Suitable operating parameters are an electric current and / or an electric power of the electric drive. The monitoring can be realized, for example, in that the control device monitors the current consumption or the power consumption of the electric drive and initiates the countermeasures when a threshold value is reached. Thus, at least within certain limits, a self-healing of the dishwasher according to the invention can be achieved.

Umfasst der elektrische Antrieb für die Umsteuervorrichtung den Umrichter oder Wechselrichter, dann kann dieser auch für einen Motor zum Antreiben einer Laugenpumpe der Geschirrspülmaschine verwendet werden, da die Laugenpumpe nicht in Betrieb ist, wenn die Umschaltvorrichtung verstellt wird.If the electric drive for the reversing device comprises the converter or inverter, then this can also be used for a motor for driving a washer of the dishwasher, since the drain pump is not in operation when the switching device is adjusted.

Ausführungsbeispiele der Erfindung sind exemplarisch in den beigefügten schematischen Zeichnungen dargestellt. es zeigen:

Fig. 1
eine Geschirrspülmaschine mit einer Wasserweiche,
Fig. 2
ein Prinzipschaubild der Geschirrspülmaschine,
Fig. 3
einen Teil der Wasserweiche und
Fig. 4
einen Teil einer alternativen Wasserweiche.
Embodiments of the invention are illustrated by way of example in the accompanying schematic drawings. show it:
Fig. 1
a dishwasher with a water diverter,
Fig. 2
a schematic diagram of the dishwasher,
Fig. 3
a part of the water switch and
Fig. 4
a part of an alternative waterway.

Die Fig. 1 zeigt eine Geschirrspülmaschine 1 und die Fig. 2 zeigt ein Prinzipschaubild der Geschirrspülmaschine 1, die einen Spülbehälter 2 zur Aufnahme von Spülgut, z.B. verschmutztem Geschirr und Besteck, aufweist, das beispielsweise in einem Geschirroberkorb 3 und einem Geschirrunterkorb 4 eingeordnet ist. In dem Spülbehälter 2 sind zumindest zwei Sprühvorrichtungen, die im Falle des vorliegenden Ausführungsbeispiels als obere und untere Sprüharme 5, 6 ausgebildet sind, zum Beaufschlagen des Spülguts mit einer Flüssigkeit, die üblicherweise als Spülflotte bezeichnet wird, angeordnet. Die Flüssigkeit kann von einer Umwälzpumpe 7 über eine erste Flüssigkeitszuleitung 8 zum oberen Sprüharm 5 und über eine zweite Flüssigkeitszuleitung 9 zum unteren Sprüharm 6 gefördert werden. Dies ist in der Fig. 2 mittels Pfeilen 21-23 veranschaulicht. Die Umwälzpumpe 7 wird z.B. mittels eines elektrischen Antriebs 15, insbesondere mittels dessen elektrischen Motors über eine Welle 16 angetrieben.The Fig. 1 shows a dishwasher 1 and the Fig. 2 shows a schematic diagram of the dishwasher 1, which has a washing container 2 for receiving items to be washed, eg soiled dishes and cutlery, which is classified for example in a Geschirroberkorb 3 and a dish rack 4. In the washing container 2, at least two spray devices, which are formed in the case of the present embodiment as the upper and lower spray arms 5, 6, arranged for applying the washware with a liquid, which is commonly referred to as rinsing liquor. The liquid can be conveyed by a circulation pump 7 via a first liquid supply line 8 to the upper spray arm 5 and via a second liquid supply line 9 to the lower spray arm 6. This is in the Fig. 2 illustrated by arrows 21-23. The circulation pump 7 is driven for example by means of an electric drive 15, in particular by means of its electric motor via a shaft 16.

Im Falle des vorliegenden Ausführungsbeispiels wird die Flüssigkeit zumindest in einem Teilprogrammschritt eines Spülprogramms der Geschirrspülmaschine 1 durch einen Durchlauferhitzer 10 erwärmt, der mit einem Eingangsstutzen 11 an die Umwälzpumpe 7 und mit Ausgangsstutzen 12, 13 an die Flüssigkeitszuleitungen 8, 9 angeschlossen ist. Die Anzahl der Ausgangsstutzen 12, 13 entspricht der Anzahl der Sprüharme 5, 6 oder gleichzeitig betriebener Gruppen von Sprüharmen 5, 6. Die von der Umwälzpumpe 7 geförderte Flüssigkeit wird demnach im Falle des vorliegenden Ausführungsbeispiels zum Eingangsstutzen 11 des Durchlauferhitzers 10 und von dessen Ausgangsstutzen 12, 13 über die Flüssigkeitszuleitungen 8, 9 zu den Sprüharmen 5, 6 geleitet.In the case of the present embodiment, the liquid is heated, at least in a partial program step of a wash program of the dishwasher 1 by a water heater 10, which is connected to an inlet nozzle 11 to the circulation pump 7 and with outlet ports 12, 13 to the liquid supply lines 8, 9. The number of outlet ports 12, 13 corresponds to the number of spray arms 5, 6 or simultaneously operated groups of spray arms 5, 6. The funded by the circulation pump 7 liquid is therefore in the case of the present embodiment to the inlet nozzle 11 of the water heater 10 and the output port 12th , 13 via the liquid supply lines 8, 9 to the spray arms 5, 6 passed.

Der elektrische Antrieb 15 ist mittels einer elektrischen Leitung 17 mit einer Steuervorrichtung 18 der Geschirrspülmaschine 1 verbunden, sodass die Steuervorrichtung 18 den elektrischen Antrieb 15 in Allgemein bekannter Weise steuern und gegebenenfalls auch regeln kann. Die Steuervorrichtung 18 umfasst z.B. einen geeignet programmierten Mikroprozessor und ist im Allgemeinen vorgesehen, die Geschirrspülmaschine 1 derart zu steuern, dass diese das Spülprogramm durchführt.The electric drive 15 is connected by means of an electrical line 17 to a control device 18 of the dishwasher 1, so that the control device 18 can control the electric drive 15 in a generally known manner and optionally also regulate. The control device 18 includes e.g. a suitably programmed microprocessor and is generally intended to control the dishwasher 1 so that it performs the washing program.

Die Geschirrspülmaschine 1 weist ferner eine Umsteuervorrichtung, insbesondere eine Wasserweiche 14 auf, die z.B. im Durchlauferhitzer 10 angeordnet oder an diesem angeformt ist. Die Wasserweiche 14 kann z.B. aber auch in der Geschirrspülmaschine 1 für sich allein angeordnet oder unmittelbar an die Umwälzpumpe 7 angeschlossen sein.The dishwasher 1 further comprises a reversing device, in particular a water diverter 14, which, e.g. arranged in the flow heater 10 or is integrally formed thereon. The water diverter 14 may e.g. but also be arranged in the dishwasher 1 by itself or be connected directly to the circulation pump 7.

Mittels der Wasserweiche 14 können die Sprüharme 5, 6 jeweils abwechselnd und/oder ständig mit der Flüssigkeit beschickt werden, was durch Öffnen eines Flüssigkeitsauslasses und durch Verschließen eines anderen Flüssigkeitsauslasses der Wasserweiche 14 erzielt wird. Die Flüssigkeitsauslässe der Wasserweiche 14 gehen im vorliegenden Ausführungsbeispiel direkt in die Ausgangsstutzen 12, 13 über oder sind mit diesen identisch. Des Weiteren weist die Wasserweiche 14 einen Flüssigkeitseinlass auf, der im Falle des vorliegenden Ausführungsbeispiels sich an den Eingangsstutzen 11 anschließt oder von diesem gebildet wird. Zum Verschließen der Flüssigkeitsauslässe wird im Falle des vorliegenden Ausführungsbeispiels ein Ventilkörper oder eine Verschlussscheibe durch einen Antrieb, insbesondere einen elektrischen Antrieb 19, verstellt.By means of the water switch 14, the spray arms 5, 6 can be alternately and / or constantly charged with the liquid, which is achieved by opening a liquid outlet and by closing another liquid outlet of the water switch 14. In the present exemplary embodiment, the liquid outlets of the water distributor 14 pass directly into the outlet ports 12, 13 or are identical to these. Furthermore, the water diverter 14 has a liquid inlet which, in the case of the present exemplary embodiment, adjoins or is formed by the inlet connection 11. To close the liquid outlets is in the case of the present Embodiment, a valve body or a closure disc by a drive, in particular an electric drive 19, adjusted.

Der elektrische Antrieb 19 ist mittels einer elektrischen Leitung 20 mit der Steuervorrichtung 18 verbunden und wird von dieser gesteuert. Insbesondere ist der elektrische Antrieb 19 derart ausgeführt, dass seine Drehrichtung durch entsprechendes Ansteuern durch die Steuervorrichtung 18 geändert werden kann. Damit die Drehrichtung des elektrische Antriebs 19 geändert werden kann, umfasst der elektrische Antrieb 19 im Falle des vorliegenden Ausführungsbeispiels einen BLDC oder einen BLAC Motor 25, also einen Dreiphasen Synchronmotor, und einen den Motor 25 ansteuernden Wechselrichter oder Umrichter 24. Der Umrichter 24 erzeugt die erforderliche elektrische Dreiphasen-Spannung für den Motor 25, also die erforderliche Frequenz und den erforderlichen Effektivwert der elektrischen Spannung. Geeignete Umrichter 24 weisen z.B. Leistungshalbleiter auf und sind dem Fachmann im Allgemeinen bekannt, weshalb der genaue Aufbau des Umrichters 24 nicht weiter erläutert wird.The electric drive 19 is connected to the control device 18 by means of an electrical line 20 and is controlled by the latter. In particular, the electric drive 19 is designed such that its direction of rotation can be changed by appropriate activation by the control device 18. In order to be able to change the direction of rotation of the electric drive 19, in the case of the present exemplary embodiment the electric drive 19 comprises a BLDC or a BLAC motor 25, ie a three-phase synchronous motor, and an inverter or converter 24 controlling the motor 25. The converter 24 generates the required three-phase electrical voltage for the motor 25, so the required frequency and the required effective value of the electrical voltage. Suitable inverters 24 include e.g. Power semiconductors and are generally known in the art, therefore, the exact structure of the inverter 24 is not further explained.

Während des Betriebs der Geschirrspülmaschine 1 bewegt der elektrische Antrieb 19 die Verschlussscheibe der Wasserweiche 14, was auch als Durchfahren der Wasserweichenposition bezeichnet wird. Im Falle des vorliegenden Ausführungsbeispiels umfasst die Wasserweiche 14 einen in der Fig. 3 gezeigten und bezüglich einer Drehachse 26 drehbar gelagerten Exzenter 27 mit einer Exzentrizität 28. Der Motor 25 des elektrischen Antriebs 19 steht mit dem Exzenter 27 z.B. über eine nicht gezeigte Kupplung oder einem nicht gezeigten Getriebe oder auch direkt in Wirkverbindung, sodass der Motors 25 zumindest indirekt den Exzenter 27 dreht. Der Exzenter 27 steht wiederum mit der Verschlussscheibe der Wasserweiche 14 in Wirkverbindung, sodass bei einer Drehung des Exzenters 27 um die Drehachse 26 die Verschlussscheibe verstellt wird und somit die Wasserweiche 14 verschiedene Stellungen einnimmt, in denen die Umwälzpumpe 7 z.B. nur Flüssigkeit zum oberen Sprüharm 5 oder nur zum unteren Sprüharm 6 fördern kann.During operation of the dishwasher 1, the electric drive 19 moves the shutter disc of the water switch 14, which is also referred to as passing through the water switch position. In the case of the present embodiment, the water diverter 14 comprises a in the Fig. 3 shown and with respect to a rotational axis 26 rotatably mounted eccentric 27 with an eccentricity 28. The motor 25 of the electric drive 19 is connected to the eccentric 27, for example via a clutch, not shown, or a transmission, not shown, or directly in operative connection, so that the motor 25, at least indirectly the eccentric 27 rotates. The eccentric 27 is in turn in operative connection with the closure disk of the water switch 14, so that upon rotation of the eccentric 27 about the axis of rotation 26, the closure disk is adjusted and thus the water switch 14 occupies different positions in which the circulation pump 7, for example, only liquid to the upper spray arm. 5 or only to the lower spray arm 6 can promote.

Im Falle des vorliegenden Ausführungsbeispiels weist die Wasserweiche 14 ferner eine bezüglich einer Achse 29 gelagerte Sperrklinke 30 mit einem starren Sperrbolzen 31 auf, mittels der der Exzenter 27 in eine vorgegebene Ausgangsstellung gebracht werden kann, in der die Exzentrizität 28 in einer vorgegebenen Ausgangsstellung ausgerichtet ist. Diese Stellung ist in der Fig. 3 gezeigt und entspricht der Ausgangsstellung der Wasserweiche 14. Die Ausgangsstellung entspricht insbesondere einer Stellung der Wasserweiche 14, in der die Umwälzpumpe 7 nur Flüssigkeit zu einem der Sprüharme 5. 6, beispielsweise zum oberen Sprüharm 5, fördert.In the case of the present embodiment, the water diverter 14 also has a relative to an axis 29 mounted pawl 30 with a rigid locking pin 31, by means of which the eccentric 27 can be brought into a predetermined starting position, in which the eccentricity 28 is aligned in a predetermined starting position. This position is in the Fig. 3 shown and corresponds to the starting position of the water switch 14. The starting position corresponds in particular to a position of the water distributor 14, in which the circulation pump 7 conveys only liquid to one of the spray arms 5. 6, for example to the upper spray arm 5.

Im Falle des vorliegenden Ausführungsbeispiels ist die Sperrklinke 30 derart angeordnet, dass bei einer Drehung des Exzenters 27 im Uhrzeigerdrehsinn, d.h. in Richtung eines Pfeils 33, der Exzenter 27 bzw. dessen Exzentrizität 28 die Sperrklinke 30 bezüglich der Achse 29 wegdrehen kann. Dadurch kann der Motor 25 den Exzenter 27 beliebig im Uhrzeigerdrehsinn drehen.In the case of the present embodiment, the pawl 30 is arranged so that upon rotation of the eccentric 27 in the clockwise direction, i. in the direction of an arrow 33, the eccentric 27 and its eccentricity 28, the pawl 30 with respect to the axis 29 can rotate away. As a result, the motor 25, the eccentric 27 rotate arbitrarily in the clockwise direction.

Dreht sich dagegen der Exzenter 27 im Gegenuhrzeigerdrehsinn, also entgegen der Pfeilrichtung des Pfeils 33, dann drückt bei der in der Fig. 3 dargestellten Stellung des Exzenters 27 die Exzentrizität 28 die Sperrklinke 30 gegen den Sperrbolzen 31 und verhindert dadurch eine weitere Drehung des Exzenters 27. Dadurch ist es möglich, den Exzenter 27 in die in der Fig. 3 dargestellte vorgegebene Ausgangsstellung zu bewegen, in der sich die Wasserweiche 14 in ihrer vorgegebenen Ausgangsstellung befindet.On the other hand rotates the eccentric 27 in the counterclockwise direction of rotation, ie opposite to the arrow direction of the arrow 33, then presses in the in the Fig. 3 illustrated position of the eccentric 27, the eccentricity 28, the pawl 30 against the locking pin 31 and thereby prevents further rotation of the eccentric 27. This makes it possible, the eccentric 27 in the in the Fig. 3 to move shown predetermined starting position, in which the water distributor 14 is in its predetermined starting position.

Im Betrieb der Geschirrspülmaschine 1 steuert z.B. zu Beginn eines Spülprogramms oder zu Beginn eines Teilprogrammschritts des Spülprogramms die Steuervorrichtung 18 bzw. ein auf der Steuervorrichtung 18 laufendes Rechenprogramm den elektrischen Antrieb 19 derart an, dass sich der Motor 25 bzw. dessen Welle in einer ersten Drehrichtung dreht, wodurch sich der Exzenter 27 im Gegenuhrzeigerdrehsinn solange dreht, bis ihn die Sperrklinke 30 stoppt. Dadurch erhöht sich das Gegenmoment bzw. die Last des Motors 25, wodurch der elektrische Strom des elektrischen Antriebs 19 steigt. Dies erkennt die Steuervorrichtung 18, indem dieses z.B. den elektrischen Strom des elektrischen Antriebs 19 mit einem vorgegebenen Schwellwert vergleicht, und stoppt den elektrischen Antrieb 19. Somit befindet sich die Wasserweiche 14 in ihrer vorgegebenen Ausgangsstellung.In the operation of the dishwasher 1 controls e.g. At the beginning of a washing program or at the beginning of a partial program step of the washing program, the control device 18 or a computer program running on the control device 18, the electric drive 19 such that the motor 25 and the shaft rotates in a first direction of rotation, whereby the eccentric 27th counterclockwise rotation until it stops the pawl 30 stops. This increases the counter-torque or the load of the motor 25, whereby the electric current of the electric drive 19 increases. This is recognized by the controller 18, e.g. compares the electric current of the electric drive 19 with a predetermined threshold, and stops the electric drive 19. Thus, the water gate 14 is in its predetermined starting position.

Während des Spülprogramms steuert die Steuervorrichtung 18 gegebenenfalls den elektrischen Antrieb 19 derart an, dass sich dessen elektrischer Motor 25 in einer zweiten Drehrichtung dreht, sodass sich der Exzenter 27 im Uhrzeigerdrehsinn dreht. Je nach Stellung des Exzenters 27 verschließt die Verschlussscheibe die Flüssigkeitsauslässe der Wasserweiche 14 derart, dass im Falle des vorliegenden Ausführungsbeispiels insbesondere die Umwälzpumpe 7 entweder nur zum oberen Sprüharm 5 oder nur zum unteren Sprüharm 6 Flüssigkeit fördert.During the wash program, the control device 18 optionally controls the electric drive 19 such that its electric motor 25 rotates in a second direction of rotation, so that the eccentric 27 rotates in the clockwise direction. Depending on the position of the eccentric 27 closes the closure disc, the liquid outlets of the water switch 14 such that in the case of the present embodiment in particular the circulating pump 7 conveys liquid either to the upper spray arm 5 or only to the lower spray arm 6.

Die Stellungen der Verschlussscheibe der Wasserweiche 14 entsprechen Stellungen des Exzenters 27. Diese werden im Falle des vorliegenden Ausführungsbeispiels derart eingestellt, dass ausgehend von der vorab eingestellten Ausgangsstellung der Wasserweiche 14 die Steuervorrichtung 18 den elektrischen Antrieb 19 derart ansteuert, dass sich dessen Motor 25 in seiner zweiten Drehrichtung um einen vorgegebenen Winkel dreht. Der Motor 25 dreht dadurch den Exzenter 27 entsprechend um einen vorgegebenen Winkel im Uhrzeigerdrehsinn, wodurch sich die gewünschten Stellungen der Wasserweiche 14 einstellen. Somit ist es lediglich nötig, dass die Steuervorrichtung 18 während des Spülprogramms den elektrischen Antrieb 19 derart ansteuert, dass dessen Motor 25, ausgehend von der Ausgangsstellung, sich bezüglich der zweiten Drehrichtung um vorgegebene Winkel dreht.The positions of the closure disk of the water switch 14 correspond to positions of the eccentric 27. These are set in the case of the present embodiment such that starting from the preset initial position of the water switch 14, the control device 18 controls the electric drive 19 such that its motor 25 in his second direction of rotation rotates by a predetermined angle. The motor 25 thereby rotates the eccentric 27 accordingly by a predetermined angle in the clockwise direction, whereby the desired positions of the water distributor 14 set. Thus, it is only necessary that the control device 18 controls the electric drive 19 during the wash program such that its motor 25, starting from the starting position, rotates by predetermined angle with respect to the second direction of rotation.

Im Falle des vorliegenden Ausführungsbeispiels werden die vorgegebenen Winkel aufgrund der Nulldurchgänge der Gegen-EMK (Englisch: Back emf) des Motors 25 des elektrischen Antriebs 19 erkannt. Weist z.B. der Motor 25 einen einpoligen Rotor auf, wie es im vorliegenden Ausführungsbeispiel vorgesehen ist, dann entsprechen zwei Nulldurchgänge der Gegen-EMK einer vollen Umdrehung des Motors 25. Um die gewünschte Stellung der Wasserweiche 14 einzustellen, d.h. um die gewünschte Position der Verschlussscheibe der Wasserweiche 14 einzustellen, sind im Falle des vorliegenden Ausführungsbeispiels die für die gewünschte Drehung des Motors 25 in seiner zweiten Drehrichtung nötigen Nulldurchgänge der Gegen-EMK des Motors 25 z.B. in einem nicht dargestellten Speicher der Steuervorrichtung 18 hinterlegt. Somit kann die Steuervorrichtung 18 während des Spülprogramms aufgrund gemessener Nulldurchgänge der Gegen-EMK des Motors 25 diesen um den vorgegebenen Winkel drehen, um die Wasserweiche 14 bzw. deren Verschlussscheibe in die gewünschten Stellungen zu bringen.In the case of the present embodiment, the predetermined angles due to the zero crossings of the back EMF (English: Back emf) of the motor 25 of the electric drive 19 are detected. Indicates e.g. the motor 25 comprises a single-pole rotor, as provided in the present embodiment, then two zero crossings of the back EMF correspond to one complete revolution of the motor 25. In order to set the desired position of the water switch 14, i. In order to set the desired position of the shutter disc of the water switch 14, in the case of the present embodiment, the zero crossings of the back EMF of the motor 25 necessary for the desired rotation of the motor 25 in its second direction of rotation are e.g. stored in a memory, not shown, of the control device 18. Thus, during the wash program, the controller 18 may rotate it by the predetermined angle due to measured zero crossings of the back EMF of the motor 25 to bring the water gate 14 and its shutter disc to the desired positions, respectively.

Im Falle des vorliegenden Ausführungsbeispiels ist es vorgesehen, zumindest in einem Teilspülprogrammschritt die Geschirrspülmaschine 1 im sogenannten Wechselkorbspülmodus zu betreiben. In diesem Betriebsmodus wird abwechselnd nur einer der beiden Sprüharme 5, 6 mit Flüssigkeit beschickt. Befindet sich die Geschirrspülmaschine 1 im Wechselkorbspülmodus, dann steuert die Steuervorrichtung 18 den elektrischen Antrieb 19 derart an, dass sich dessen Motor 25 zunächst von seiner Ausgangsstellung, die im Falle des vorliegenden Ausführungsbeispiels der Stellung der Wasserweiche 14 entspricht, in der die Umwälzpumpe 7 nur Flüssigkeit zum oberen Sprüharm 5 fördert, um den vorgegebenen Winkel im Uhrzeigerdrehsinn dreht, um die Wasserweiche 14 in eine Stellung zu bringen, in der die Umwälzpumpe 7 nur Flüssigkeit zum unteren Sprüharm 5 fördert. Nach einer vorgegebenen Zeitdauer steuert die Steuervorrichtung 18 den elektrischen Antrieb 19 derart an, dass sich der Motor 25 im Gegenuhrzeigerdrehsinn um den vorgegebenen Winkel dreht, wodurch die Wasserweiche 14 wieder in die Stellung gebracht wird, in der die Umwälzpumpe 7 nur Flüssigkeit zum oberen Sprüharm 5 fördert. Dies wird so oft wie gewünscht wiederholt.In the case of the present exemplary embodiment, it is provided to operate the dishwasher 1 in the so-called change basket washing mode, at least in a partial washing program step. In this operating mode, only one of the two spray arms 5, 6 is alternately charged with liquid. If the dishwasher 1 is in the change-over washing mode, then the control device 18 controls the electric drive 19 such that its motor 25 initially from its initial position, which corresponds in the case of the present embodiment, the position of the water switch 14, in which the circulating pump 7 promotes only liquid to the upper spray arm 5, rotates at the predetermined angle in the clockwise direction to the To bring water diverter 14 in a position in which the circulation pump 7 promotes only liquid to the lower spray arm 5. After a predetermined period of time, the control device 18 controls the electric drive 19 such that the motor 25 rotates in the counterclockwise direction of rotation by the predetermined angle, whereby the water switch 14 is brought back into the position in which the circulation pump 7 only liquid to the upper spray arm. 5 promotes. This is repeated as many times as desired.

Alternativ kann es vorgesehen sein, dass im Wechselkorbspülmodus die Steuervorrichtung 18 den elektrischen Antrieb 19 ausgehend von der Ausgangsstellung derart ansteuert, dass sich dessen Motor 25 zunächst von seiner Ausgangsstellung um den vorgegebenen Winkel im Uhrzeigerdrehsinn dreht, um die Wasserweiche 14 in eine Stellung zu bringen, in der die Umwälzpumpe 7 nur Flüssigkeit zum unteren Sprüharm 5 fördert. Nach einer vorgegebener Zeitdauer steuert die Steuervorrichtung 18 den elektrischen Antrieb 19 derart an, dass sich der Motor 25 weiter im Uhrzeigerdrehsinn um einen weiteren vorgegebener Winkel dreht, um die Wasserweiche 14 wieder in die Stellung zu bringen, in der die Umwälzpumpe 7 nur Flüssigkeit zum oberen Sprüharm 5 fördert. Da der Exzenter 27 nicht durch die Sperrklinke 30 blockiert wird, wenn sich der Motor 25 im Uhrzeigerdrehsinn dreht, kann dieses Programm wie gewünscht beliebig of wiederholt werden.Alternatively, it can be provided that in the Wechselkorbspülmodus the control device 18, the electric drive 19 starting from the initial position controls such that its first motor 25 rotates from its initial position by the predetermined angle in the clockwise direction to bring the water distributor 14 in a position, in which the circulation pump 7 promotes only liquid to the lower spray arm 5. After a predetermined period of time, the control device 18 controls the electric drive 19 such that the motor 25 continues to rotate in the clockwise direction by a further predetermined angle to bring the water switch 14 back into the position in which the circulation pump 7 only liquid to the upper Spray arm 5 promotes. Since the eccentric 27 is not blocked by the pawl 30, when the motor 25 rotates in the clockwise direction, this program can be repeated as desired of any.

Im Falle des vorliegenden Ausführungsbeispiels ist es noch vorgesehen, dass die Steuervorrichtung 18 die Höhe des elektrischen Stroms des elektrischen Antriebs 19, z.B. dessen Effektivwert, überwacht. Wird der Motor 25 aufgrund eines zu hohen Gegenmoments an der Verschlussscheibe blockiert, da beispielsweise ein Fremdkörper die Bewegung der Verschlussscheibe behindert oder blockiert, dann steigt der elektrische Strom des elektrischen Antriebs. Somit ist es möglich, aufgrund eines Überwachens des elektrischen Stroms des elektrischen Antriebs 19 auf einen unzulässigen Betriebszustand zu schließen, sodass z.B. die Steuervorrichtung 18 geeignete Gegenmaßnahmen einleiten kann. Geeignete Gegenmaßnahmen sind z.B. ein Absenken des Drucks im Hydraulikkreislauf der Geschirrspülmaschine 1 oder ein Ansteuern des elektrischen Antriebs 19 derart, dass dieser seine aktuelle Drehrichtung ändert. Die Überwachung des elektrischen Stroms kann z.B. derart realisiert werden, dass die Steuervorrichtung 18 den Effektivwert des elektrischen Stroms mit einem vorgegebenen Maximalwert vergleicht und die Gegenmaßnahmen einleitet, wenn der Effektivwert des elektrischen Stroms den Maximalwert überschreitet.In the case of the present exemplary embodiment, it is also provided that the control device 18 monitors the magnitude of the electrical current of the electric drive 19, for example its effective value. If the motor 25 is blocked due to a too high counter-torque on the shutter disk, for example because a foreign body obstructs or blocks the movement of the shutter disk, then the electric current of the electric drive increases. Thus, it is possible, due to monitoring of the electrical current of the electric drive 19 to conclude an inadmissible operating state, so that, for example, the control device 18 can initiate appropriate countermeasures. Suitable countermeasures are, for example, a lowering of the pressure in the hydraulic circuit of the dishwasher 1 or a triggering of the electric drive 19 such that it changes its current direction of rotation. The monitoring of the electric current For example, it can be realized such that the control device 18 compares the effective value of the electric current with a predetermined maximum value and initiates the countermeasures when the effective value of the electric current exceeds the maximum value.

Die Fig. 4 zeigt einen Teil einer alternativen Wasserweiche 14a, die anstelle der Wasserweiche 14 für die Geschirrspülmaschine 1 verwendet werden kann. Die Wasserweiche 14a unterscheidet sich im Wesentlichen von der Wasserweiche 14 dadurch, dass die Wasserweiche 14a keine Sperrklinke 30, sondern einen unbeweglichen Festanschlag 32 aufweist. Somit kann der Exzenter 27 im Wesentlichen nur eine volle Umdrehung ausführen.The Fig. 4 shows a part of an alternative water diverter 14a, which can be used instead of the water diverter 14 for the dishwasher 1. The water switch 14 a differs substantially from the water switch 14 in that the water switch 14 a no pawl 30, but has a stationary fixed stop 32. Thus, the eccentric 27 can perform substantially only one full revolution.

Ist die Geschirrspülmaschine 1 mit der Wasserweiche 14a versehen, dann steuert im Falle des vorliegenden Ausführungsbeispiels z.B. zu Beginn eines Spülprogramms oder eines Teilprogrammschritts des Spülprogramms die Steuervorrichtung 18 den elektrischen Antrieb 19 derart an, dass sich der Motor 25 in seiner ersten Drehrichtung dreht, wodurch sich der Exzenter 27 im Gegenuhrzeigerdrehsinn solange dreht, bis ihn der Festanschlag 32 stoppt. Dies erkennt die Steuervorrichtung 18 aufgrund des sich erhöhenden elektrischen Stroms des elektrischen Antriebs 19 und stoppt diesen. Somit befindet sich die Wasserweiche 14a in ihrer vorgegebenen Ausgangsstellung, in der z.B. die Umwälzpumpe nur Flüssigkeit zum oberen Sprüharm 5 fördern kann.If the dishwasher 1 is provided with the water diverter 14a, then in the case of the present embodiment e.g. at the beginning of a washing program or a program step of the washing program, the control device 18, the electric drive 19 so that the motor 25 rotates in its first rotational direction, whereby the eccentric 27 rotates counterclockwise rotation until it stops the hard stop 32. This recognizes the control device 18 due to the increasing electric current of the electric drive 19 and stops it. Thus, the water diverter 14a is in its predetermined starting position, in the e.g. the circulation pump can only convey liquid to the upper spray arm 5.

Während des Spülprogramms steuert die Steuervorrichtung 18 gegebenenfalls den elektrischen Antrieb 19 derart an, dass sich dessen elektrischer Motor 25 zunächst in seiner zweiten Drehrichtung dreht, sodass sich der Exzenter 27 im Uhrzeigerdrehsinn dreht, bis der Exzenter 27 eine weitere Stellung der Wasserweiche 14a einnimmt, in der die Umwälzpumpe 7 z.B. nur Flüssigkeit zum unteren Sprüharm 6 fördern kann. Den erforderlichen zurückzulegenden Winkel des Motors 25 ermittelt die Steuervorrichtung 18 aufgrund vorgegebener Nulldurchgänge der Gegen-EMK des Motors 25 des elektrischen Antriebs 19.During the wash program, the control device 18 optionally controls the electric drive 19 such that its electric motor 25 first rotates in its second direction of rotation, so that the eccentric 27 rotates in the clockwise direction until the eccentric 27 occupies another position of the water switch 14 a, in the circulating pump 7, for example can only promote fluid to the lower spray arm 6. The required angle of the motor 25 to be traversed is determined by the control device 18 on the basis of predetermined zero crossings of the back EMF of the motor 25 of the electric drive 19.

Da die Wasserweiche 14a den Festanschlag 32 aufweist, kann der elektrische Antrieb 19 den Exzenter 27 nicht beliebig im Uhrzeigerdrehsinn drehen. Im Falle des vorliegenden Ausführungsbeispiels ist es daher vorgesehen, dass die Steuervorrichtung 18 den elektrischen Antrieb 19 für eine Verstellung der Wasserweiche 14a derart ansteuert, dass dessen Motor 25 gegebenenfalls seine Drehrichtung ändert und sich in der geänderten Drehrichtung z.B. um einen weiteren vorgegebenen Winkel dreht.Since the water switch 14 a has the fixed stop 32, the electric drive 19, the eccentric 27 does not rotate arbitrarily in the clockwise direction. In the case of the present embodiment, it is therefore provided that the control device 18, the electric Drive 19 for an adjustment of the water gate 14a such that its motor 25 optionally changes its direction of rotation and rotates in the changed direction of rotation, for example by a further predetermined angle.

Claims (28)

  1. Method for the operation of a dishwasher (1), comprising a washing receptacle (2), at least two spraying devices (5, 6) located within the washing receptacle (2); a reversing device (14, 14a) and a drive (19) with an electric motor (25) in functional connection with the reversing device, in order to bring the reversing device (14, 14a) into different positions, and a circulation pump (7), which depending on the set position of the reversing device (14, 14a) conveys liquid to one of the two and/or to both spraying devices (5, 6), having the following method steps:
    actuation of the drive (19) in such a way that the electric motor (25) rotates in a first direction of rotation until the reversing device (14, 14a) assumes a predefined starting position, und blocks a further rotation of the electric motor (25) in the direction of the first direction of rotation, and
    actuation of the drive (19) in such a way that based on the starting position the reversing device (14, 14a) assumes a specific position.
  2. Method according to claim 1, characterised in that the actuation of the specific position takes place in a feedback-free manner.
  3. Method according to claim 1 or 2, characterised in that the actuation takes place by means of displacement by a predefined value, in particular by means of rotation by a predefined angle.
  4. Method according to one of the claims 1 to 3, characterised in that the starting position corresponds to one of the positions of the reversing device (14).
  5. Method according to one of the claims 1 to 4, characterised in that zero crossings of the Back emf of the motor (25) are determined, while the latter rotates by the predefined angle, and actuation of the drives (19) until the number of zero crossings of the Back emf assigned to a predefined angle of the motor (25) has been determined.
  6. Method according to claim 1, characterised in that the reversing device (14, 14a) comprises mechanical blocking means (29-32), which prevent a further rotation of the motor (25) in the direction of its first direction of rotation upon the starting position being reached.
  7. Method according to claim 6, characterised in that the blocking means (29-32) are embodied as a retaining pawl (29-31) or as a hard stop (32).
  8. Method according to one of the claims 1 to 7, characterised by detection of the attainment of the starting position of the reversing device (14, 14a) based on at least one operating parameter of the electric drive (19) and halting of the electric drive (19).
  9. Method according to claim 8, characterised in that the operating parameter of the drive (19) is an electric current and/or an electrical power of the electric drive (19) and/or a torque conveyed by the motor (25).
  10. Method according to one of the claims 1 to 9, having actuation of the drive (19) in such a way that the motor (25) rotates by a predefined angle in a second direction of rotation (33) which differs from the first direction of rotation.
  11. Method according to one of the claims 1 to 10, characterised by additional actuation of the electric drive (19) in such a way that the motor (25) rotates by the predefined angle alternately in the clockwise direction and in the counter-clockwise direction.
  12. Method according to one of the claims 1 to 11, characterised by additional monitoring, of at least one operating parameter of the drive (19), while the motor (15) rotates by the predefined angle, in order to detect a blocking of the motor (25), and initiation of countermeasures, when a blocked motor (25) is detected.
  13. Method according to claim 12, characterised in that the operating parameter of the drive (19) is an electric current and/or an electrical power of the electric drive.
  14. Method according to one of the claims 1 to 13, characterised in that upon detection of a blocking of the drive (19) a reduction in the pressure of the hydraulic circuit of the dishwasher (1) takes place and/or an actuation of the drive (19) takes place, such that the motor (25) rotates against the current direction of rotation.
  15. Dishwasher, at least having a washing receptacle (2) with at least two spraying devices (5, 6) located within the washing receptacle (2), a reversing device (14, 14a) and a drive (19) with an electric motor (25) in functional connection with the reversing device (14, 14a), in order to bring the reversing device (14, 14a) into different positions, a control device (18) for actuation of the electric drive (19) and a circulation pump (7), which depending on the set position of the reversing device (14, 14a) conveys liquid to one of the two and/or to both spraying devices (5, 6), characterised in that the control device (18) controls the drive (19) in such a manner that the electric motor (25) rotates in a first direction of rotation until the reversing device (14, 14a) initially assumes a predefined starting position and blocks a further rotation of the electric motor (25) in the direction of the first direction of rotation, and the reversing device (14, 14a) subsequently assumes a specific position.
  16. Dishwasher according to claim 15, characterised in that the dishwasher (1) is embodied for the feedback-free actuation of the specific position.
  17. Dishwasher according to claim 15, characterised in that the actuation takes place by means of displacement by a predefined value, in particular by means of rotation by a predefined angle.
  18. Dishwasher according to one of the claims 15 to 17, characterised in that the starting position corresponds to one of the positions of the reversing device (14).
  19. Dishwasher according to one of the claims 15 to 18, characterised in that the control device (18) is set up to determine zero crossings of the Back emf of the motor (25), while the latter rotates by the predefined angle, and the control device (18) is set up to control the electric drive (19) until the control device (18) has determined the number of zero crossings of the Back emf assigned to the predefined angle of the motor (25).
  20. Dishwasher according to claim 15, characterised in that the reversing device (14, 14a) comprises mechanical blocking means (29-32), which prevent further rotation of the motor (25) in the direction of its first direction of rotation upon the starting position being reached.
  21. Dishwasher according to claim 20, characterised in that the blocking means (29 -32) are embodied as a retaining pawl (29-31) or as a hard stop (32).
  22. Dishwasher according to one of the claims 15 to 19, characterised in that the control device (18) is set up to detect the attainment of the starting position of the reversing device (14, 14a) based on at least one operating parameter of the drive (19), and stops the drive (19) depending on the operating parameter.
  23. Dishwasher according to claim 22, characterised in that the operating parameter of the electric drive (19) is an electric current and/or an electrical power of the electric drive (19) and/or a torque conveyed by the motor (25).
  24. Dishwasher according to one of the claims 15 to 23, characterised in that the control device (18) is set up to control the electric drive (19) in such a way that the motor (25) rotates by the predefined angle in a second direction of rotation (33) which differs from the first direction of rotation.
  25. Dishwasher according to one of the claims 15 to 24, characterised in that the control device (18) is set up to control the drive (19) in such a way that the motor (25) rotates by the predefined angle alternately in the clockwise direction and in the counter-clockwise direction.
  26. Dishwasher according to one of the claims 15 to 23, characterised in that the control device (18) is set up to monitor at least one operating parameter of the drive (19) while the motor (25) rotates by the predefined angle, in order to recognise a blocking of the motor (25), and the control device (18) is set up to initiate countermeasures, when the control device (18) has detected a blocked motor (25).
  27. Dishwasher according to claim 26, characterised in that the operating parameter of the drive (19) is an electric current and/or an electrical power of the electric drive (19).
  28. Dishwasher according to claim 20 or 27, characterised in that upon detection of a blocking of the drive (19), a reduction in the pressure of the hydraulic circuit of the dishwasher (1) takes place, and/or an actuation of the electric drive (19) takes place, such that the motor (25) rotates against the current direction of rotation.
EP08803202.4A 2007-08-31 2008-08-25 Method for the operation of a dishwasher Active EP2187797B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007041299A DE102007041299A1 (en) 2007-08-31 2007-08-31 Method for operating a dishwasher
PCT/EP2008/061086 WO2009027372A1 (en) 2007-08-31 2008-08-25 Method for the operation of a dishwasher

Publications (2)

Publication Number Publication Date
EP2187797A1 EP2187797A1 (en) 2010-05-26
EP2187797B1 true EP2187797B1 (en) 2013-12-11

Family

ID=39929800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08803202.4A Active EP2187797B1 (en) 2007-08-31 2008-08-25 Method for the operation of a dishwasher

Country Status (5)

Country Link
US (1) US8834644B2 (en)
EP (1) EP2187797B1 (en)
CN (1) CN101784221B (en)
DE (1) DE102007041299A1 (en)
WO (1) WO2009027372A1 (en)

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SI2532295T1 (en) * 2012-09-25 2017-03-31 V-Zug Ag Domestic appliance with a water valve
US9763552B2 (en) 2014-06-12 2017-09-19 Haier Us Appliance Solutions, Inc. Dishwasher diverter valves with continuous calibration
BR112017009011A2 (en) * 2014-12-18 2018-01-30 Electrolux Appliances AB dishwasher
DE102017208527A1 (en) * 2017-05-19 2018-11-22 BSH Hausgeräte GmbH Water-conducting household appliance and method for operating a water-conducting household appliance
DE102017223255A1 (en) * 2017-07-18 2019-01-24 BSH Hausgeräte GmbH Household dishwasher and method for the treatment of Spülgutteilen
DE102019135316A1 (en) * 2019-12-19 2021-06-24 Minebea Mitsumi Inc. Adjustment unit and method for adjusting an actuator
CN112716409B (en) * 2021-01-07 2022-07-15 佛山市顺德区美的洗涤电器制造有限公司 Control method for dishwasher, processor, device, dishwasher and medium
EP4198351A1 (en) 2021-12-20 2023-06-21 Flender GmbH Transmission with oil spray element

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DE3209542C1 (en) * 1982-03-16 1992-05-07 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Dishwashing machine
EP0383028A3 (en) * 1989-02-14 1992-05-06 Licentia Patent-Verwaltungs-GmbH Dishwashing machine compromising an electro-mechanic reversing device
IT1271243B (en) * 1994-10-05 1997-05-27 Candy Spa COMMAND DEVICE FOR A VALVE FOR WASHING FLOW FLOW CONTROL, TO SELECTIVELY SUPPLY THE SPRAYING IMPELLERS OF A DISHWASHER MACHINE
DE19857101B4 (en) 1998-12-10 2004-04-01 BSH Bosch und Siemens Hausgeräte GmbH Domestic dishwashing machine
DE19914359C5 (en) * 1999-03-30 2006-01-05 Whirlpool Corp., Benton Harbor Dishwasher with upper and lower spray arm
DE10133130A1 (en) * 2001-07-07 2003-01-16 Miele & Cie Circulation pump with/without heating device, especially for supplying washing liquid to dishwasher spray arms, has water switch integrated into circulation pump
DE10225610B4 (en) * 2002-06-07 2006-12-28 Trinamic Motion Control Gmbh & Co. Kg Method and circuit arrangement for operating a stepper motor
US7475696B2 (en) * 2003-06-17 2009-01-13 Whirlpool Corporation Dishwasher having valved third-level sprayer
CN100431464C (en) * 2004-11-26 2008-11-12 乐金电子(天津)电器有限公司 Flow path water leakage proofing structure of bowl washer

Also Published As

Publication number Publication date
CN101784221B (en) 2012-12-26
EP2187797A1 (en) 2010-05-26
CN101784221A (en) 2010-07-21
WO2009027372A1 (en) 2009-03-05
US20110120500A1 (en) 2011-05-26
US8834644B2 (en) 2014-09-16
DE102007041299A1 (en) 2009-03-05

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