EP3624664B1 - Dishwasher and method for operating a dishwasher - Google Patents

Description

The present invention relates to a dishwasher, in particular a household dishwasher, and a method for operating such a dishwasher.

Conventional dishwashing machines have so-called automatic programs which, based on a detection of the degree of soiling of the items to be washed, automatically select a washing liquor temperature during the execution of the washing program for washing the items to be washed. In the case of heavy soiling in particular, this can be in the range of 60°C - 80°C. Although good cleaning performance can be achieved at these temperatures, this high temperature has a negative effect on glass corrosion. Glass corrosion causes premature aging, especially of glasses that are washed in the dishwasher. This is undesirable and very annoying, especially in the case of high-quality and expensive glasses. There is therefore a need for a washing program that is gentle on the glass, in particular while maintaining the cleaning performance.

Conventional dishwashers and methods for operating dishwashers are from DE 24 41 361 A1 , the WO 2012/028710 A1 and the EP 2 425 758 known.

the EP 2 425 758 A1 discloses a dishwasher with a washing container in which at least one upper basket and one lower basket are arranged or can be arranged to accommodate the items to be washed, the upper basket being able to accommodate more delicate items to be washed and the lower basket being able to accommodate more stable items to be washed. The dishwasher also includes a rinsing liquor circulation system which distributes rinsing liquor within the washing container by means of an upper spray arm and a lower spray arm and has at least one pump for supplying rinsing liquor to both spray arms and also has liquor heating means for heating the rinsing liquor in such a way that the rinsing liquor is at least can be heated up to a first temperature T ₁ and a second temperature T ₂ , wherein the first temperature T ₁ is lower than the second temperature T ₂ , and wherein the Rinse liquor circulation system stops supplying the rinsing liquor to the upper spray arm when the rinsing liquor temperature exceeds the first temperature T ₁ .

Against this background, an object of the present invention is to propose an improved dishwasher.

According to a first aspect, a dishwasher, in particular a household dishwasher, is proposed, with a washing tub, a lower washware receptacle arranged in the washing tub, an upper washware receptacle arranged above the lower washware receptacle, a lower spray device assigned to the lower washware receptacle for spraying the washware in the lower washware receptacle arranged with washing liquor, an upper spray device assigned to the upper washware receptacle for spraying the washware arranged in the upper washware receptacle with the rinsing liquor, a hydraulic device for conveying the rinsing liquor to the lower spray device and to the upper spray device, and a control device for carrying out a washing program from a number of washing programs for washing the items to be washed, the control device being set up to control the hydraulic device in such a way that in a first section of the wash program, the wash liquor having a first wash liquor temperature is sprayed exclusively onto the lower wash items holder and in a second section of the wash program following the first section, the wash liquor having a second wash liquor temperature that is lower than the first wash liquor temperature is sprayed onto the lower wash items holder and onto the upper wash items holder .

Due to the fact that in the first section of the washing program only the wash items in the lower wash items holder are sprayed with the wash liquor having the higher first wash liquor temperature, the wash items in the upper wash items holder are not exposed to the wash liquor with the higher first wash liquor temperature. In contrast, items to be washed in the lower items to be washed, for example pots, can advantageously be cleaned with the washing liquor having the higher first washing liquor temperature.

For example, if glasses are arranged in the upper washware holder, then these glasses are not sprayed with the washing liquor with the higher first washing liquor temperature that glass corrosion and/or wear of the glasses are reduced. The glasses in the upper washware holder can then be cleaned in the second section of the washing program by means of the washing liquor having the lower second washing liquor temperature.

The first washing liquor temperature is preferably below 60°, preferably below 55°, more preferably below 50°C. The second rinsing liquor temperature is preferably above 65°C, preferably above 70°C, particularly preferably above 75°C.

The control device can be implemented in terms of hardware and/or software. In the case of a hardware implementation, the control device can be embodied as a checking device or as part of a backend, for example as a computer or as a microprocessor. In the case of a software implementation, the control device can be embodied as a computer program product, as a function, as a routine, as part of a program code or as an executable object.

The rinsing liquor or rinsing liquid is water to which chemicals, such as rinsing agent or rinse aid, can be added, is circulated by the circulating pump in a circuit for rinsing the items to be washed and can contain dirt particles.

The spray device comprises at least one device for spraying the items to be washed with the washing liquid. The respective device can be, for example, a rotating spray arm or a nozzle permanently installed in the washing compartment.

In the dishwasher, the washing liquor is provided in the first section with the first washing liquor temperature and a first washing liquor quantity in the washing tub. The washing liquor in the second section is provided with the second washing liquor temperature and a second washing liquor quantity which is higher than the first washing liquor quantity in the washing container.

Furthermore, the dishwasher includes a fresh water connection for supplying fresh water into the washing compartment and between the fresh water connection and the flush tank arranged valve. The control device is set up to actuate the valve after the first section to increase the amount of washing liquor in the washing tub from the first amount of washing liquor to the second amount of washing liquor and to reduce the washing liquor temperature in the washing tub from the first rinsing liquor temperature to the second rinsing liquor temperature. Alternatively, the first section of the washing program can be extended in such a way that the temperature of the washing liquor cools down to the second washing liquor temperature without additional measures.

According to one embodiment of the dishwasher, the hydraulic device includes a pump and/or a water diverter.

The pump is, for example, a circulating pump for circulating the washing liquor in the dishwasher. The circulating pump is preferably arranged in a pump well of the dishwasher. The pump well is a receptacle for liquid arranged under the washing container as a template for a pump, such as the circulating pump or a drain pump. The water diverter is a device with an inlet and a plurality of outlets, which is set up to distribute liquid entering via the inlet over the plurality of outlets. The water diverter is arranged in particular between the circulating pump and the spray devices. For example, an inlet of the water switch is connected to an outlet of the circulating pump, a first outlet of the water switch is connected to an inlet of the lower spray device and a second outlet of the water switch is connected to an inlet of the storage device.

According to a further embodiment of the dishwasher, the pump is designed as a circulating pump for feeding the lower spray device and the upper spray device with the washing liquor.

According to a further embodiment of the dishwasher, the control device is set up to set a speed of the circulating pump and/or a position of the water switch in the first section of the washing program such that only the lower spray device is charged with the washing liquor.

This control of the circulating pump and/or water diverter ensures that in the first section washing liquor is sprayed exclusively onto items to be washed in the lower items to be washed.

According to a further embodiment of the dishwasher, the upper spray device is designed as an upper spray arm and the lower spray device as a lower spray arm.

According to a further embodiment of the dishwasher, the lower spray arm is arranged below the lower washware receptacle. The lower spray arm preferably has outlet openings for spray jets from the washing liquor, pointing upwards in the direction of the lower washware receptacle.

According to a further embodiment of the dishwasher, the control device is set up to set a speed of the circulating pump in the first section of the washing program in such a way that only the lower spray arm is charged with washing liquor and the spray jets emerging from the outlet openings of the lower spray arm only enter the lower washing material receptacle touch the items to be washed.

According to a further embodiment of the dishwasher, the dishwashing program is a cleaning and rinsing program in which a cleaning agent is added to the washing liquor, the first section corresponding to a first step of the cleaning and rinsing program.

Alternatively or additionally, the dishwashing program includes a cleaning sub-program step in which a cleaning agent is added to the washing liquor, with the first section corresponding to a first step of the cleaning sub-program step.

According to a further embodiment of the dishwasher, the washing program is a pre-wash, with the first section corresponding to a first step of the pre-wash.

According to a further embodiment of the dishwasher, the washing program is a high-temperature washing program, the first section corresponding to a first step of the high-temperature washing program and the washing liquor temperature in the second section being at least 65°C.

According to a second aspect, a method for operating a dishwasher, in particular a domestic dishwasher, is proposed. The dishwasher comprises a wash tub, a lower washware receptacle arranged in the wash tub, an upper washware receptacle arranged above the lower washware receptacle, a lower spray device assigned to the lower washware receptacle for spraying the washware arranged in the lower washware receptacle with washing liquor, an upper spray device assigned to the upper washware receptacle Spraying the washware arranged in the upper washware receptacle with the wash water, a hydraulic device for conveying the wash water to the lower spray device and to the upper spray device, and a control device for carrying out a washing program from a number of wash programs for washing the washware.

The hydraulic device is actuated via the control device in such a way that in a first section of the washing program the washing liquor at a first washing liquor temperature is sprayed exclusively onto the lower washware receptacle and in a second section of the washing program following the first section the washing liquor has a temperature opposite to the first Washing liquor temperature lower second washing liquor temperature is sprayed on the lower dishwashing receptacle and on the upper dishwashing receptacle. The washing liquor is provided in the first section with the first washing liquor temperature and a first washing liquor quantity in the washing container. The washing liquor is provided in the second section with the second washing liquor temperature and a second washing liquor quantity which is higher than the first washing liquor quantity in the washing container. The dishwasher has a fresh water connection for feeding fresh water into the washing compartment and a valve arranged between the fresh water connection and the washing compartment, and the control device controls the valve after the first section to increase the amount of washing liquor in the washing compartment from the first amount of washing liquor to the second amount of washing liquor and to reduce the rinsing liquor temperature in the washing tub from the first rinsing liquor temperature to the second rinsing liquor temperature.

The embodiments and features described for the proposed dishwasher apply accordingly to the proposed method.

• Fig. 1 zeigt eine schematische Perspektivansicht eines Ausführungsbeispiels einer Geschirrspülmaschine;
• Fig. 2 zeigt eine schematische Querschnittsansicht eines ersten Ausführungsbeispiels eines Spülbehälters der Geschirrspülmaschine gemäß Fig. 1;
• Fig. 3 zeigt eine schematische Querschnittsansicht eines Ausführungsbeispiels eines zweiten Spülbehälters der Geschirrspülmaschine gemäß Fig. 1; und
• Fig. 4 zeigt ein Ablaufdiagramm eines Ausführungsbeispiels eines Verfahrens zum Betreiben einer Geschirrspülmaschine.

Further advantageous configurations of the dishwasher are the subject matter of the dependent claims and of the exemplary embodiments of the dishwasher described below. The dishwasher is explained in more detail below on the basis of preferred embodiments with reference to the enclosed figures.

• 1 shows a schematic perspective view of an embodiment of a dishwasher;
• 2 shows a schematic cross-sectional view of a first exemplary embodiment of a washing container of the dishwasher according to FIG 1 ;
• 3 FIG. 1 shows a schematic cross-sectional view of an exemplary embodiment of a second washing compartment of the dishwasher according to FIG 1 ; and
• 4 shows a flowchart of an embodiment of a method for operating a dishwasher.

Elements that are the same or have the same function have been provided with the same reference symbols in the figures, unless otherwise stated.

1 shows a schematic perspective view of an embodiment of a dishwasher 1. The dishwasher 1 can be, for example, a free-standing, an integrated or a fully integrated dishwasher 1. The dishwasher 1 is designed here as a household dishwasher 1. The domestic dishwasher 1 includes a washing compartment 2, which can be closed by a door 3, which is in particular watertight. For this purpose, a sealing device (not shown) can be provided between the door 3 and the washing container 2 . The washing compartment 2 is preferably cuboid. The washing compartment 2 can be arranged in a housing of the domestic dishwasher 1 . The washing container 2 and the door 3 can form a washing chamber 4 for washing items to be washed.

Door 3 is in the 1 shown in their open position. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at a lower end of the door 3 . With the help of the door 3, a loading opening 6 of the washing compartment 2 can be closed or opened. The washing compartment 2 has a base 7, a cover 8 arranged opposite the base 7, a rear wall 9 arranged opposite the closed door 3 and two side walls 10, 11 arranged opposite one another. The bottom 7, the top 8, the rear wall 9 and the side walls 10, 11 can be made from a stainless steel sheet, for example. Alternatively, for example, the bottom 7 can be made of a plastic material.

The domestic dishwasher 1 also has at least one washware receptacle 12, 13, 14. Preferably, several, for example three, washware holders 12, 13, 14 can be provided, with washware holder 12 being a lower washware holder or a lower rack, washware holder 13 being an upper washware holder or an upper rack and washware holder 14 being a cutlery drawer. As the 1 further shows that the washing items receptacles 12, 13, 14 are arranged one above the other in the washing compartment 2. Each washware holder 12 to 14 can be moved either into or out of the washing compartment 2 . In particular, each washware receptacle 12, 13, 14 can be pushed into the washing compartment 2 in an insertion direction E and pulled out of the washing compartment 2 in a pull-out direction A counter to the insertion direction E.

The domestic dishwasher 1 also includes a control device 15 which is set up to control various components and units of the domestic dishwasher 1 . In the embodiment of 1 is the control device 15 provided on the door 3 of the domestic dishwasher 1 by way of example.

2 shows a schematic cross-sectional view of a first exemplary embodiment of a washing container 2 of the dishwasher 1 according to FIG 1 . Items to be washed (not shown) can be arranged in the receptacles 12 , 13 for items to be washed in the washing compartment 2 . In the embodiment of 2 the washing compartment 2 has a lower wash-ware receptacle 12 and an upper wash-ware receptacle 13. The two wash-ware receptacles 12 and 13 are designed, for example, as crockery baskets. A lower spray device 16 for spraying the items to be washed arranged in the lower item to be washed with washing liquor is assigned to the lower item to be washed 12 . The lower spray device 16 is designed, for example, as a spray arm. Furthermore, the upper washware receptacle 13 is assigned an upper spray device 17 for spraying the washware arranged in the upper washware receptacle 13 with the washing liquor. The upper spray device 17 can be designed as a spray arm.

Furthermore, a hydraulic device 18, 19 for conveying the washing liquor to the lower spray device 16 and to the upper spray device 17 is provided. In the embodiment of 2 the hydraulic device 18, 19 includes a circulating pump 18 and a water diverter 19, which is coupled between the circulating pump 18 and the lower spray device 16 or the upper spray device 17. A sump 23 in which the washing liquor is collected as a template for the circulating pump 18 and a drain pump 20 is arranged under the washing container 2 .

Those related to 1 The control device 15 shown is set up to carry out a washing program from a number of washing programs for washing the items to be washed which are arranged in the washing compartment 2 .

The control device 15 is set up to control the hydraulic device 18, 19 in such a way that in a first section of the washing program, the washing liquor having a first washing liquor temperature is sprayed exclusively onto the lower washware receptacle 12 and in a second section of the washing program following the first section the rinse liquor having an opposite to the first rinse liquor temperature lower second washing liquor temperature is sprayed onto the lower dishwashing receptacle 12 and onto the upper dishwashing receptacle 13 .

In other words, in the first section of the washing program, the washing liquor is sprayed exclusively onto the items to be washed which are accommodated in the lower item to be washed receptacle 12 . Consequently, in this first section of the washing program, items to be washed which are arranged in the upper items to be washed receptacle 13 are not sprayed with the washing liquor having the higher first washing liquor temperature.

In particular, the wash liquor has the first wash liquor temperature in the first section of the wash program and is provided as a first amount of wash liquor in the wash tub 2 . In the second section of the washing program, the washing liquor has the second washing liquor temperature and is provided with a second washing liquor quantity in the washing tub 2 . The first rinse liquor temperature is greater than the second rinse liquor temperature and the first rinse liquor amount is less than the second rinse liquor amount. Setting the washing liquor temperature and quantity of washing liquor in this way ensures that in the first section the hotter washing liquor is not sprayed onto the items to be washed in the upper washing items holder, whereas the cooler washing liquor is sprayed onto the items to be washed in the second section of the washing program to clean all of the items to be washed in the washing chamber 4 the wash items in the lower wash items holder 12 and in the upper wash items holder 13 are sprayed.

In the first section of the washing program, the control device 15 is set up in particular to set a speed of the circulating pump 18 and/or a position of the water diverter 19 such that only the lower spray device 16 is charged with the washing liquor. Consequently, in this first section of the washing program, the upper spray device 16 is not charged with washing liquor.

As already stated above, the spray devices 16, 17 can be designed as spray arms. In such a case - as in 2 shown - the lower spray arm 16 is arranged below the lower dishwashing receptacle 12 . The lower spray arm 16 preferably has outlet openings for spray jets of washing liquor, pointing upwards in the direction of the lower dishwashing receptacle 12 . In this case, the control device 15 is preferably set up to determine a speed of the circulation pump 18 in the first section of the washing program in such a way that only the lower spray arm 16 is loaded with washing liquid and the spray jets emerging from the outlet openings of the lower spray arm 16 only touch the washware accommodated in the lower washware holder 12 . This ensures that the washing liquor with the higher first washing liquor temperature does not touch the washware held in the upper washware receptacle 13 in the first section of the wash program.

In 3 FIG. 1 is a schematic cross-sectional view of a second exemplary embodiment of a washing tub 2 of the dishwasher 1 according to FIG 1 shown. The second embodiment of the washing container 2 of 3 includes all features of the first embodiment 2 . In addition, the 3 that a fresh water connection 21 and a valve 22 are provided. The fresh water connection 21 is set up to feed fresh water into the washing container 2 . The valve 22 is connected between the fresh water connection 21 and the rinsing container 2 .

The control device 15 is preferably set up to switch the valve 22 by means of a control signal C after the first section of the wash program to increase the amount of wash liquor in the wash tub 2 from the first amount of wash liquor to the second amount of wash liquor and to reduce the temperature of the wash liquor in the wash tub 2 from the first Rinse liquor temperature to control the second rinsing liquor temperature. In other words, the fresh water connection 21, the valve 22 and their control by the control device 15 ensure that the washing liquor in the first section of the washing program has the higher first washing liquor temperature and the lower first washing liquor quantity, whereas in the second section and thus after At the end of the first section, the washing liquor in the washing tub 2 has the lower second washing liquor temperature, but the higher second washing liquor quantity.

4 shows a flowchart of an embodiment of a method for operating a dishwasher 1, as an example with reference to FIG 1 , 2 and 3 shown. The dishwasher 1 comprises a washing tub 2, a lower washware receptacle 12 arranged in the washing tub 2, an upper washware receptacle 13 arranged above the lower washware receptacle 12, a lower spray device 16 assigned to the lower washware receptacle 12 for spraying the washware arranged in the lower washware receptacle 12 with washing liquor , one of the top dishes 13, assigned upper spray device 17 for spraying the wash items arranged in the upper wash items receptacle 13 with washing liquor, a hydraulic device 18, 19, for example comprising a circulation pump 18 and a water diverter 19, for conveying the wash liquor to the lower spray device 16 and to the upper spray device 17 and a control device 15 for carrying out a washing program from a number of washing programs for washing the items to be washed.

• In Schritt S1 wird die hydraulische Einrichtung 18, 19 über die Steuerungsvorrichtung 15 derart angesteuert, dass sie in einem ersten Abschnitt des Spülprogramms die Spülflotte aufweisend eine erste Spülflottentemperatur ausschließlich auf die untere Spülgutaufnahme 12 gesprüht wird.
• In Schritt S2 wird in einem auf den ersten Abschnitt folgenden zweiten Abschnitt des Spülprogramms die Spülflotte aufweisend eine gegenüber der ersten Spülflottentemperatur niedrigere zweite Spülflottentemperatur auf die untere Spülgutaufnahme 12 sowie auf die obere Spülgutaufnahme 13 gesprüht.

The exemplary embodiment of the method 4 includes steps S1 and S2:

• In step S1, the hydraulic device 18, 19 is controlled via the control device 15 in such a way that in a first section of the washing program, the washing liquor having a first washing liquor temperature is sprayed exclusively onto the lower washware receptacle 12.
• In step S2, in a second section of the washing program following the first section, the washing liquor having a second washing liquor temperature that is lower than the first washing liquor temperature is sprayed onto the lower washware receptacle 12 and onto the upper washware receptacle 13.

Although the present invention has been described using exemplary embodiments, it can be modified in many ways.

Reference signs used:

1

dishwasher

2

flush tank

3

door

4

dishwashing room

5

pivot axis

6

loading opening

7

floor

8th

ceiling

9

back panel

10

Side wall

11

Side wall

12

items to be washed

13

items to be washed

14

items to be washed

15

control device

16

spray device

17

spray device

18

circulation pump

19

water switch

20

drain pump

21

fresh water connection

22

Valve

23

pump pot

A

extraction direction

C

control signal

E

insertion direction

S1

process step

S2

process step

Claims (12)

1. Dishwasher (1), in particular a household dishwasher, with a dishwashing container (2), a lower holder (12) for items to be washed arranged in the dishwashing container (2), an upper holder (13) for items to be washed arranged above the lower holder (12) for items to be washed, a lower spray facility (16) assigned to the lower holder (12) for items to be washed for spraying the items to be washed arranged in the lower holder (12) for items to be washed with washing liquor, an upper spray facility (17) assigned to the upper holder (13) for items to be washed for spraying the items to be washed arranged in the upper holder (13) for items to be washed with the washing liquor, a hydraulic facility for conveying the washing liquor to the lower spray facility (16) and to the upper spray facility (17), and a control device (15) for performing a dishwashing program from a number of dishwashing programs for washing the items to be washed, wherein the control device (15) is designed to actuate the hydraulic facility in such a manner that in a first segment of the dishwashing program the washing liquor having a first washing liquor temperature is only sprayed onto the lower holder (12) for items to be washed and in a second segment of the dishwashing program following the first segment the washing liquor having a second washing liquor temperature that is lower than the first washing liquor temperature is sprayed onto the lower holder (12) for items to be washed and the upper holder (13) for items to be washed,
   characterised in that

   the washing liquor is provided with the first washing liquor temperature and a first quantity of washing liquor in the dishwashing container (2) in the first segment, wherein the washing liquor is provided with the second washing liquor temperature and a second quantity of washing liquor, which is greater than the first quantity of washing liquor, in the dishwashing container (2) in the second segment,

   wherein the dishwasher (1) has a fresh water connection for conducting fresh water into the dishwashing container (2) and a valve arranged between the fresh water connection and the dishwashing container (2), wherein the control device (15) is designed to actuate the valve after the first segment to increase the quantity of washing liquor in the dishwashing container (2) from the first quantity of washing liquor to the second quantity of washing liquor and to reduce the washing liquor temperature in the dishwashing container (2) from the first washing liquor temperature to the second washing liquor temperature.
2. Dishwasher according to claim 1, wherein the hydraulic facility comprises a pump and/or a water diverter.
3. Dishwasher according to claim 2, wherein the pump is configured as a circulating pump for supplying the lower spray facility (16) and the upper spray facility (17) with the washing liquor.
4. Dishwasher according to claim 3, wherein the control device (15) is designed to set a speed of the circulating pump and/or a position of the water diverter in the first segment of the dishwashing program such that only the lower spray facility (16) is supplied with washing liquor.
5. Dishwasher according to one of claims 1 to 4, wherein the upper spray facility (17) is configured as an upper spray arm and the lower spray facility (16) is configured as a lower spray arm.
6. Dishwasher according to claim 5, wherein the lower spray arm is arranged below the lower holder (12) for items to be washed and has outlet openings pointing upward in the direction of the lower holder (12) for items to be washed for spraying jets of washing liquor.
7. Dishwasher according to claim 6, wherein the control device (15) is designed to set a speed of the circulating pump in the first segment of the dishwashing program such that only the lower spray arm is supplied with washing liquor and the jets sprayed out of the outlet openings of the lower spray arm only come into contact with items to be washed that are held in the lower holder (12) for items to be washed.
8. Dishwasher according to one of claims 1 to 7, wherein the dishwashing program is a cleaning dishwashing program, in which a cleaning agent is added to the washing liquor, wherein the first segment corresponds to a first step of the cleaning dishwashing program.
9. Dishwasher according to one of claims 1 to 7, wherein the dishwashing program is a pre-rinse, wherein the first segment corresponds to a first step of the pre-rinse.
10. Dishwasher according to one of claims 1 to 7, wherein the dishwashing program is high-temperature dishwashing program, in which the washing liquor temperature is at least 65°C, wherein the first segment corresponds to a first step of the high-temperature dishwashing program.
11. Method for operating a dishwasher (1), in particular a household dishwasher, with a dishwashing container (2), a lower holder (12) for items to be washed arranged in the dishwashing container (2), an upper holder (13) for items to be washed arranged above the lower holder (12) for items to be washed, a lower spray facility (16) assigned to the lower holder (12) for items to be washed for spraying the items to be washed arranged in the lower holder (12) for items to be washed with washing liquor, an upper spray facility (17) assigned to the upper holder (13) for items to be washed for spraying the items to be washed arranged in the upper holder (13) for items to be washed with the washing liquor, a hydraulic facility for conveying the washing liquor to the lower spray facility (16) and to the upper spray facility (17), a control device (15) for performing a dishwashing program from a number of dishwashing programs for washing the items to be washed, wherein the hydraulic facility is actuated by way of the control device (15) in such a manner that in a first segment of the dishwashing program the washing liquor having a first washing liquor temperature is only sprayed onto the lower holder (12) for items to be washed and in a second segment of the dishwashing program following the first segment the washing liquor having a second washing liquor temperature that is lower than the first washing liquor temperature is sprayed onto the lower holder (12) for items to be washed and onto the upper holder (13) for items to be washed,
    characterised in that

    the washing liquor is provided with the first washing liquor temperature and a first quantity of washing liquor in the dishwashing container (2) in the first segment, wherein the washing liquor is provided with the second washing liquor temperature and a second quantity of washing liquor, which is greater than the first quantity of washing liquor, in the dishwashing container (2) in the second segment,

    wherein the dishwasher (1) has a fresh water connection for conducting fresh water into the dishwashing container (2) and a valve arranged between the fresh water connection and the dishwashing container (2), wherein the control device (15) actuates the valve after the first segment to increase the quantity of washing liquor in the dishwashing container (2) from the first quantity of washing liquor to the second quantity of washing liquor and to reduce the washing liquor temperature in the dishwashing container (2) from the first washing liquor temperature to the second washing liquor temperature.
12. Computer program product, which prompts the performance of the method according to claim 11 on a program-controlled facility.

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