EP2217131A1

EP2217131A1 - Method for controlling a rinse cycle in a water-bearing household appliance

Info

Publication number: EP2217131A1
Application number: EP08854311A
Authority: EP
Inventors: Michael Rosenbauer
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2007-11-27
Filing date: 2008-10-28
Publication date: 2010-08-18
Also published as: CN101877993B; CN101877993A; WO2009068391A1; DE102007056918B3

Abstract

The invention relates to a method for controlling a rinse cycle in a water-bearing household appliance, particularly a dishwasher or washing machine, to meet a predetermined discharge performance by adapting at least one operating parameter of the water-bearing household device, comprising at least the steps: a) measuring (S10) a fill volume (Vist) admitted into the water-bearing household appliance, b) determining (S12) a fill volume deviation (ΔV) of the admitted fill volume (Vist) from a predetermined target fill volume (Vsoll), and c) adapting (S24, S26) at least one operating parameter such that the predetermined discharge performance is achieved under consideration of the fill volume deviation (ΔV).

Description

Method for controlling a wash cycle in a water-conducting household appliance

The invention relates to a method for controlling a rinse cycle in a water-conducting household appliance.

In water-bearing household appliances, such as. Dishwashers, tolerances are taken into account in the design of the amount of water to be filled for the rinse that the filling amount is greater than the desired filling quantity is selected. To ensure that in a dishwasher with a filling volume tolerance of ± 0.1 ltr. in 100% of the devices from a production series a nominal filling quantity V _SO ιι of 3.5 Itr. therefore, 3.6 ltr. ± 0.1 ltr. filled. Many devices therefore work with more water than the nominal filling quantity. Since up to six water changes are carried out per wash cycle, depending on the appliance type and the selected wash program, the additional water consumption can be considerable.

In order to achieve optimum performance values for the variables influencing the efficiency of a dishwasher, it is also necessary to minimize tolerances of those components of the dishwasher which influence these variables. However, reducing the tolerances, for example by very accurately metering the amount of water supplied, is costly and costly because of the additional elements required.

DE 40 38 802 A1 discloses a dishwasher with a control of the sequence of work programs by a microcomputer, in which the inflowing amount of water is detected by a quantity meter connected to the microcomputer. This allows the work programs to be more accurately controlled.

The invention has for its object to reduce the füllmengetoleranzbedingten water consumption and thus also the energy required to heat the filled water without the cleaning performance is reduced. The principle of the invention is to regulate other operating parameters, such as, for example, the pressure and / or the speed of a circulation pump or a circulation time of wash liquor on the basis of the actually filled actual filling amount so that an equal removal rate is achieved for a Target filling quantity would be required.

In simple dishwashers, some predetermined rinses with predetermined sets of desired operating parameters, such as the filling amount of the water, rinsing temperature, volume flow when circulating the rinse water and rinsing time, are preprogrammed in a control device and selectable by the user. The nominal operating parameter sets are designed for a specific standard load of items to be washed. For this purpose, a certain removal rate is provided. More comfortable dishwashing machines comprise devices for determining the loading and for determining and setting load-dependent sets of desired operating parameters corresponding to a load-dependent removal rate, in order, for. B. to save time and energy at low load.

The removal rate (AE) provided for rinsing during a rinse cycle is a measure of the cleaning effect. It is proportional to the volume flow (dV / dt), i. the amount of water (flushing solution) circulated during the wash cycle, the pressure (p) at the spray nozzle and the circulation time (t) of the wash cycle:

AE = const. x dV / dt x p x t. (Eq. AE)

In this equation for the removal rate (AE), the constant "const." Takes into account further operating parameters which are not explicitly mentioned in the equation and which also influence the removal rate, for example the cleaning temperature and the type of flushing agent used.

The object is therefore achieved in a method for controlling a rinse cycle in a water-conducting domestic appliance, in particular dishwashing or washing machine, to a predetermined removal rate by adjusting at least one operating parameter of the water-bearing household appliance, comprising at least the steps: (A) detecting (S10) a sunken in the domestic appliance water

Filling quantity (V _ιst ),

(b) determining (S12) a filling quantity _deviation (ΔV) of the admitted filling quantity (V _ιst ) from a predetermined nominal filling quantity (V _soN ), and

(c) adjusting (S24, S26) at least one operating parameter, such that, taking into account the filling quantity deviation (ΔV), the predetermined removal rate is achieved

The operating parameters to be controlled in step c) can include, for example, a flow rate per unit time (F = dV / dt) of the circulated rinsing liquor, the pressure (p), a rotational speed (n) of circulation means and the circulation time or purging duration (t) of the rinse cycle , These operating parameters are easily controllable with components which are already present in conventional dishwashers and with significantly lower tolerances than the filling quantity.

According to this method, it is not necessary to calculate the filling quantity accurately, e.g. to dose or regulate to 3.5 ± 0.1 liters. Instead, first the recessed actual filling quantity is measured, which is less technically complicated, and in step (b) determines the filling quantity deviation. Then, depending on the filling quantity deviation, a different operating parameter, different from the filling quantity, is determined and adapted such that, in spite of or with the actual filling quantity deviating from the nominal filling quantity, the removal rate and thus the desired cleaning performance are achieved. Thus, the filling amount of, for example, 3.6 ± 0.1 liter, to ensure a minimum quantity of 3.5 liters, can be reduced to 3.5 ± 0.1 liters.

To detect the actual filling quantity (V _ιst ), the filling time of a reference volume can be measured at a constant filling volume flow. Also, an impeller sensor can be provided and read out.

In step (c), the delivery rate (F) per unit time or the number of revolutions per minute (s) of recirculation means can be adjusted during the wash cycle. In particular, the delivery rate per unit time (F = dV / dt) depending on the _{Füllmengenabweichung} ( _.DELTA.V ) can be adjusted to a control flow rate (F _rΘgΘ |), if by a flow deviation (.DELTA.F = F _reg ei - F _so n) from a target Flow rate (F _so n) deviates. In the case of a variable-speed circulating pump, the same applies to a rotational speed (n) of the circulating pump which is adapted to a regulating rotational speed (n _rΘgΘ |) if it is offset by a rotational speed deviation (Δn = n _rΘgΘ | _{-n soN} ) from the nominal rotational speed. Speed (n _so n) deviates. If the actual filling quantity (V _ιst ) is greater than the nominal filling quantity (Vsoii) or the filling quantity deviation (ΔV = V _ιst - V _SO ιι) positive (overfilling), the delivery quantity deviation (ΔF) is likewise positive or the control-flow (F _r EGEi) is greater than the target flow rate (F _so n) set and vice versa.

The delivery rate of the circulating means is normally directly proportional to the speed of the circulating pump. Underfilling must reduce the flow rate or speed to prevent the circulation pump from "draining" and sucking in air due to the lower water pressure at its suction side, resulting in increased noise, speed fluctuations, and reduced flow rate Overfilling the increased water pressure on the suction side of the circulating pump exploited by the fact that the flow rate and the speed increases while the time is shortened, for example, at the same removal rate.

The deviation from the desired flow rate or the desired speed can be determined so that the relative deviation of the flow rate (.DELTA.F / F _so n) with respect to the target flow rate (Fsoii) or the relative deviation of the rotational speed (.DELTA.n /. n _so n) with respect to the target rotational speed (n _so n) is equal to the relative filling quantity deviation (.DELTA.V / V _so n) with respect to the desired filling amount (V _SO ιι). This leads to a substantially proportional, ie hardware-technically and / or software technically simple and stable control algorithm.

In step (c), the circulation time (T) can be adjusted accordingly. In particular, depending on the filling quantity deviation (ΔV), it can be set to a regulating circulation time (T _rΘgΘ ι), which _deviates by a deviation (ΔT) of equal magnitude from the filling quantity deviation (ΔV) with respect to a set circulation time (T _so n) , If the actual filling quantity (V _ιst ) is greater than the nominal filling quantity (V _so n) or the filling quantity _deviation (ΔV = V _ιst - V _so n) is positive, ie greater than zero, then the regulating circulation time (T _regΘ |) but smaller than the set recirculation time (T _so n) or the deviation of the recirculation time (ΔT) to be negative and vice versa. The regulation of the circulation time can be advantageously combined with the control of the flow rate or speed of the circulating means. Because in the case of an underfilling, the reduction of the delivery rate or the rotational speed, which corresponds to a reduction of the volume flow (dV / dt) and the pressure (p) in equation (AE), is compensated by an extension of the circulation time t, so that the removal rate decreases Equation (AE) remains constant. The energy consumption of the longer circulation time is compensated by the energy saving due to the smaller capacity. Conversely, in the event of overfilling, the increase in the delivery rate or the rotational speed, which corresponds to an increase in the volume flow (dV / dt) and the pressure (p) in equation (AE), is compensated by shortening the circulation time t, so that the removal rate decreases Equation (AE) remains constant. The energy consumption due to the increased filling quantity is partly compensated by the energy saving due to the shortened circulation time.

In this case, the deviation (.DELTA.T) can be determined so that the relative deviation (.DELTA.T / T _so n) of the circulation time with respect to the target circulation time (T _soN ) equal to the relative deviation (.DELTA.V / V _SO ιι) of the fill in Reference to the desired filling quantity (V _so n) is. This also leads to a substantially proportional, ie technically simple and stable control algorithm.

In combination with the proportional control of the flow rate or speed of the circulating pump, therefore, the control of the flow rate or speed and Umwälzzeit compensate so that according to the equation (AE), the removal rate and thus the cleaning result remain constant. In this combination, step (c) may comprise the following substeps:

(i) comparing the amount of charge taken in (V _s t) with the target charge amount (V _so n). If the admitted filling quantity (V _ιst ) is smaller, the rotational speed (n) is _adapted to a desired rotational speed (n _so n) and the circulation time (T) to a nominal circulation time (T _so n).

(ii) If the admitted filling _amount (V _ιst ) is greater than the set filling _amount (V _soN ), the rotational speed (n) is set to a target rotational speed (n _soN ) and the circulation time (T) to a target revolving time (T _so ii) adapted. From the speed (n), the flow rate per unit time (F) is adjusted. The target speed (n _Sθ ιι) is a speed which is smaller than an operating point of the circulating means corresponding speed. Accordingly, the target circulation time (T _so n) is a circulation time which is greater than a circulation time corresponding to the predetermined removal rate.

If the recessed actual charge is greater than the target charge, the risk of idling the intake side of the recirculation fluid is reduced. The circulation means can then be operated with a larger flow rate per unit of time, that is, at a higher speed (s). This is accompanied by an increase in the pressure (p) in the recirculation means and an increased energy consumption due to the larger filling quantity as well as an increase in the removal rate (see equation AE). The increased energy consumption and the increased removal rate are partially compensated by a corresponding shortening of the circulation time (t).

In a first step, a driven with a speed-controllable motor circulation pump can be adjusted to a speed stable running by (ιι n _SO) with a deviating from the desired operating point of the operating point and with a with respect to a target rotational speed (different rule speed n (V | _St +) or n (V | _St- )) is operated. For this purpose, in a second step, a control circulation time deviating from a desired circulation time can be determined. A speed reduction in the first step is compensated by an extension of the circulation time (T) or an increase in speed in the first step by reducing the circulation time (T) so that the removal rate remains the same. In this embodiment of the first step, components which are already present in a water-conducting domestic appliance are generally used anyway, and no separate means for measuring the actual filling quantity are required.

As a basis for the predetermination of the removal rate for each degree of loading, the loading can first be determined. For this purpose, for example, the weight of the washware to be washed or its entire surface can be detected. At the beginning of the process may further include the removal rate including the desired filling amount (V _so n) and / or the target circulation time (T _SO ιι) depending on the specific load be predetermined. With a higher degree of loading than a standard, a greater removal rate is predetermined and vice versa. Preferably, the determination of the removal rate is proportional to the load in order to achieve a satisfactory cleaning result for each degree of loading. For example. will provide for glass a low removal rate than for normal items and especially heavily soiled items a particularly high removal rate. Furthermore, in a preferred embodiment, a choice of Abtragsleitung done by a program selection, with which a certain Abtragsleitung is specified, the achievement of which is ensured by the inventive method.

To solve the above object also serves a water-conducting household appliance, such as. A dishwashing machine or a washing machine. In particular, it comprises a measuring device for the actually admitted filling quantity (V _ιst ).

As an operating parameter of an operation usually a circulation time and a flow rate or speed of the circulating means are provided. In conventional water-conducting household appliances for a certain target circulation time (T _so n) as well as a working point of the circulation corresponding predetermined target flow rate (Fsoii) or target speed (n _so n) are predetermined and preprogrammed in a control unit.

According to the invention, the water-conducting household appliance comprises a control unit for implementing the method described above. It determines deviations of the operating parameters from the particular operating parameters of the circulating means in order to regulate the operating parameters to a predetermined removal rate.

The circulation means may comprise a circulation pump with a speed-controllable electric motor. It can be an asynchronous motor, possibly with phase control and speed adaptation, a brushless DC motor with a permanent magnet (BLDC motor) or a synchronous motor with frequency converter, which enables sensorless speed detection.

The actual filling quantity (V _s t) can be determined by means of a container with a reference volume, for example one in conventional water-carrying Domestic appliance already used water storage, which is in heat-conducting contact with the washing compartment, or detected with a level sensor. The water reservoir preferably consists of a arranged on one side of a washing chamber, can be filled with water container having a narrow and tall shape. By this form, the height of the water level or the filling amount can be determined with a high resolution. The fill level sensor can be designed as a capacitive or inductive sensor, or it can comprise a fan-shaped or sheet-shaped light barrier extending over the height interval covered by the sensor. Alternatively or additionally, the actually admitted filling quantity can be detected with an impeller wheel arranged in a water inlet line.

In a preferred embodiment, the means for detecting the actual amount of charge taken in a serving for driving the circulation pump electric motor with a load-dependent torque characteristic, means for detecting the time dependence of the speed, means for controlling the speed of the electric motor and means for detecting a working point of the electric motor at constant speed, working together so that the electric motor experiences a constant load at a speed dependent on the actual charge (V | _St ). Since the hardware required for this is already present in conventional dishwashers, only software-implemented control and, in any case, no cost-causing measuring devices are required to measure the filling quantity.

The water-conducting household appliance may comprise means for determining the load and further comprising means for predetermining the removal rate including the desired filling amount (V _so ii) and / or the target circulation time (T _so n) depending on the load. This ensures that even with a variable degree of loading always a consistently satisfactory cleaning result is achieved. The means for determining the removal rate can be designed so that the removal rate is set proportionally to the load. This is technically, especially software-technically easy to implement.

To determine the load, the weight of the items to be washed and / or the total surface thereof can be detected. For this purpose, weight or pressure sensors can be arranged on the wash ware baskets. To determine the total surface optical Serve means, for. B. a system of arranged in the rinsing chamber light barriers and / or a camera with connected image processing means, with each of which the degree of loading of one or more Spülgutkörbe can be detected.

The principle of the invention will be explained in more detail below with reference to the drawings by way of example. In the drawings show:

1 is a schematic representation of a dishwasher,

2 is a schematic representation of characteristics of a driven with an electric motor circulation pump,

3 shows a flow chart for the method for regulating a rinse cycle.

Reference is first made to Fig. 1 reference.

A dishwashing machine 2 shown schematically comprises a washing chamber 4 delimited by a washing chamber housing 6, washware baskets 8 displaceably mounted and removable in the washing chamber for receiving wash ware 10 and a spray arm 14 rotatably mounted in the wash chamber 4 with a plurality of spray nozzles 16 for illuminating the wash ware 10 with water or rinsing eye.

The dishwasher 2 further includes a water supply system with a next to a side wall of the Spülkammergehäuses 6 mounted water reservoir 30 as a heat storage for receiving water at a certain temperature, disposed on the top of the water reservoir 30 vent valve 32, a connecting line 38 to a water connection 42 with a water connection valve 44 for shutting off a fresh water supply (indicated in FIG. 1 by an arrow), an inlet pump 36, a reservoir inlet line 34, a controllable first inlet valve 37 for opening or closing the reservoir inlet line 34, an inlet line 50, a controllable second inlet valve 52 and a at the water reservoir 30 mounted level sensor 48 in the water reservoir in the vicinity of a reference level height 46th The dishwasher 2 further comprises a circulation circuit, which consists of a rinsing chamber 4, arranged at the bottom of the rinsing chamber 4 drain 18, a Umwälzansaugleitung 20, a suction line 22, a supply line 12, the spray arm 14 and a circulating pump 24 as a circulating means with respect to his Speed controllable electric motor 26 as a drive. It is coupled directly or via a transmission with the circulation pump 24.

Finally, the dishwasher 2 includes a drain system 64 which is not described in more detail.

To a control unit (controller) 76 the following important for the execution of the invention elements are connected: A signal line 58 transmits a measurement signal of the level sensor 48 and thus allows a direct measurement of the feed rate V _ιst . A motor control line 62 passes measurement signals relating to the rotational speed of the electric motor 26 to the controller 76 and conversely transmits signals for switching on and off and for regulating the rotational speed.

In the water supply system, the connecting line 38 connects the water connection 42 with the suction side of the feed pump 36. The reservoir supply line 34 connects, switchable by means of the first inlet valve 37, the pressure side of the feed pump 36 with the water reservoir 30. The supply line 50 connects, switchable by means of the second inlet valve 52 , the water reservoir 30 with the circulation circuit and goes to the confluence of the Umwälzansaugleitung 20 in the circulation pump intake passage 22.

In operation, the controller 76 causes the supply of fresh water from the water port 42 by a timing of the feed pump 36 or the first

Inlet valve 37. A regulation of the water supply quantity V _so n over the period of

Promotion by the feed pump 36 and the opening of the reservoir supply line 34 leads to relatively large tolerances in the amount of water supplied z. B. by

Pressure fluctuations at the water connection 42 or in the water supply network to which the dishwasher 2 is connected, or by variations in the installation height of the

Water connection 42 with respect to the height of the mouth of the supply line 50 in the

Circulation cycle or in the washing chamber. 4 Instead of the operation control to a nominal filling quantity V _SO ιι relates, the actually supplied amount of water accumulated V _ιst is now measured. The measurement provided for this is done via the level sensor 48 at the water reservoir 30 with signal to the controller 76. The water reservoir 30 is bounded by substantially vertical walls, so that the size and shape of the water surface in the water reservoir 30 is constant regardless of the filling level. The water reservoir is a regularly shaped, rectangular, flat container which has approximately the dimension of the side wall of the rinsing chamber 4. The level sensor 48 is disposed approximately at the level of a reference level 46 and measures the actual level in a height interval of ± 5% to the reference level height 46. It is designed as a capacitive sensor and outputs a signal through the signal line 58 for the exact Level of the water reservoir 30 and thus the actually accumulated filling quantity V _ιst on the controller 76 on.

Reference is now made to FIG. 2.

FIG. 2 serves to illustrate a method for measuring the actual filling quantity V _ιst , in which components of the dishwasher 2 which are already present for the rinsing or circulating operation are used. In the purge or circulation operation, the actually admitted amount of water is circulated by the circulation pump 24. In this case, the controller 76 controls the timing of switching on and off of the electric motor 26 of the circulation pump 24 and thus the circulation time T via the control line 62. In the on state of the motor 26, the controller 76 also controls the speed n of the motor 26th

In FIG. 2, the rotational speed n of the electric motor 26 is plotted on the abscissa 82 and the torque M developed by the engine 26 is plotted as ordinate 80. The curve 84 illustrates the characteristic of a motor 26 relationship between the torque M and the rotational speed n, so the motor characteristic. The curve 86 indicates the characteristic of the circulation pump 24, monotonically increasing relationship between the load M and the rotational speed n of the circulation pump 24 for a certain amount, so the pump load curve for the target filling amount V _so n. The intersection 88 of the pump load Characteristic curve 86 with the engine characteristic 84 is the operating point for the nominal filling quantity Vsoii of the circulation pump 24 at the speed n _SO ιι = n (V _so n). At the operating point, the speed n of the motor 26 in accordance with the pump load M for the associated capacity and allows a smooth running of the motor 26 without fluctuations in the rotational speed n. In a high speed with respect to the operating point, the circulation pump 24 in addition to the water also draw air, which leads to increased noise and to a load and speed fluctuation. With respect to the operating point to low speed n, the suction pressure for the circulation pump 24 is too high and there may be pressure fluctuations in the intake pipe 22 and thus also to speed fluctuations.

Each filling quantity has its own operating point on its own characteristic curve. To a ιι in comparison with the nominal filling quantity V _SO to .DELTA.V larger capacity includes the pump characteristic curve 90, 84 _(so n + .DELTA.V V)> n _as n intersects the engine characteristic curve at the operating point 92 at the speed n. To a by .DELTA.V / 2 smaller capacity includes the pump characteristic curve 94, which 84 <n _as n intersects the engine characteristic curve at the operating point 96 at the speed n (V _SO ιι-.DELTA.V). For a pump-motor combination with a known engine characteristic curve 84, the actual filling quantity V _ιst can thus be determined by measuring the rotational speed n of the associated operating point.

To implement the method _according to the invention, the rotational speed n of the pump-motor combination is varied by one of the nominal filling quantity V n associated target speed n _so n until a running of the pump-motor combination with a stable speed n is established. With an underfilling ( _Vιst <V _so n) results in a speed n _ιst <n _so n- With the reduction of the speed n, the pump pressure p and the flow rate F = dV / dt decrease. In turn, the recirculation time T increases so that according to the equation (AE), the removal rate remains the same. The increased by the increased circulation time T energy consumption is thus compensated by the energy savings due to the lower filling quantity V _ιst .

In case of overfilling (V _ιst > V _so n), a rotational speed n _ιst > n _{soN is established} . Accordingly, the pump pressure p and the flow rate F = dV / dt increase; the circulation time T shrinks. Energy consumption due to the higher filling volume V | _St is thus compensated by the shortened Umwälzzeit T.

The resulting lower flow per unit time under underfilling reduces the risk of idling the intake manifold 22 and reduces associated noise. With the reduction of the delivery rate dV / dt or the speed n is also accompanied by a reduction of the pressure p. The reduction of the delivery rate dV / dt or speed n and the reduction of the pressure p would lead according to equation (AE) to a reduction of the removal rate. This is compensated by a corresponding extension of the circulation time T. This ensures a consistently good cleaning result.

Reference is now made to FIG. 3.

Fig. 3 illustrates the essential steps of the control process during a rinse cycle. After the start S2, the loading 10 of the rinsing chamber 4 is first determined in S4. Subsequently, the removal rate AE required for a sufficient cleaning result of the load 10 is determined in S6. For this purpose, the measured actual weight of the load 10 is compared with the stored standard weight Wsta _n da _r d of a standard load and the default load AE _standard stored for the standard load is adjusted according to the formula AE = AE _standard χ (W _lst / W _standard ). Then, in S8, for the load 10 determined in S4, the desired operating parameters are determined which are required to achieve the removal rate AE. These are in particular the nominal filling quantity V n _so, the target delivery rate (dV / dt) _soN or the speed n _so _as n n for the circulation mode and the target T circulation time. Subsequently, the nominal filling quantity V is _so in S10 n admitted to fresh water and actually filled actual filling quantity V _{ιst measured} in the beginning rinsing operation. The controller 76 then determines in S12 the filling quantity _deviation ΔV = V _ιst - V _SO ιι.

Thereafter, it is checked in S14 whether the charge amount deviation ΔV is positive or negative. If .DELTA.V is positive ( _Vιst > V _so n) and thus there is an overfill, in S20 the

Speed n of the circulation pump 24 is increased until a speed-stable run sets. Thus, the (increased) control speed n _regΘ | intended for this rinse. Then the for This cycle to be observed rule-Umwälzzeit T _reg ei set in S22 such that the increase of the control speed n _rΘgΘ ι compared to the target speed n _SO ιι by a reduced in relation to the target circulation time T _SO ιι Rule circulation time T _rΘgΘ compensated and according to equation (AE) the rule removal rate equal to the target removal rate is achieved. For a negative .DELTA.V in S14 (V | _St <V _so n), so for underfilling, in S16, the speed of the circulation pump 24 is reduced n until it receives a speed stable running. Thus, the (reduced) control speed n _reg egg is determined for this rinse. Then in S18, the control circulation time T _rΘgΘ ι set such that the reduction of the control speed compensated by an extended control circulation time T _rΘgΘ ι and according to equation (AE), the rule removal rate equal to the target removal rate is achieved. If V _ιst = V _SO ιι, ie ΔV = 0, then no change in the speed must be made. This rare case is not shown in Fig. 3.

With the thus determined operating parameters is then transit in S24, the wash cycle and brought to an end, the circulating pump 24 n during rule-circulation time to the control speed _brisk i operates adjusted. Upon reaching the control circulation time T _rΘgΘ ι in S26, the circulation pump 24 is stopped, thus completing the circulation. This ends the rinse in S28.

Since the preceding dishwashing machine described in detail and the method are exemplary embodiments, they can be obtained in the usual way from

Be modified to a wide extent without departing from the scope of the invention. In particular, the concrete embodiments of

Circulating means and the control device take place in a different form from that described here. Likewise, the measuring devices can be configured in a different form, if this is necessary, for example, for space or designerischen reasons.

Furthermore, the use of the indefinite article "on" or "one" does not exclude that the characteristics in question may also be present multiple times. LIST OF REFERENCE NUMBERS

2 dishwasher

4 rinsing chamber

6 rinsing chamber housing 8 wash basket

10 items to be washed

12 supply line

14 spray arm

16 spray nozzles 18 circulation process

20 Circulation suction line

22 suction line

24 circulation pump

26 motor for circulating pump drive 28 outlet or spray speed

30 water reservoir

32 bleed valve

34 Reservoir supply line

36 inlet pump 37 first inlet valve

38 connecting cable

42 water connection

44 water connection valve

46 Reference level 48 Level sensor

50 supply line

52 second inlet valve

54 Control line for first inlet valve

56 Control line for feed pump 58 Signal line from the level sensor

60 control line for second inlet valve

62 control line / engine control

64 drainage system 76 Control Unit / Controller

80 torque ordinate

82 engine speed abscissa

84 Motor characteristic

86 Pump load for nominal filling quantity 88 Nominal operating point

90 pump load for larger capacity

92 Operating point for larger capacity

94 Pump load for smaller capacity

92 working point for smaller capacity

Claims

1. A method for controlling a rinse cycle in a water-conducting household appliance, in particular dishwashing or washing machine, to a predetermined removal rate by adjusting at least one

Operating parameters of the water-conducting household appliance, comprising at least the steps:

(A) detecting (S10) a sunken in the domestic appliance water

Filling quantity (V _ιst ), (b) determining (S12) a filling quantity deviation (ΔV) of the admitted

Filling _amount (V _ιst ) of a predetermined target filling _amount (V _so n), and

(C) adjusting (S24, S26) at least one operating parameter such that under

Considering the filling amount deviation (.DELTA.V) the predetermined removal rate is achieved.

2. The method according to claim 1, characterized in that in step (c) as an operating parameter, a delivery rate per unit time, a rotational speed (S24) and / or a circulation time (T) (S26) of circulating means (24, 26) is adjusted.

3. The method according to any one of claims 1 to 2, characterized in that in step (c) upon detecting an undershooting of the target filling amount (V _so n) out a delivery rate (F) or a rotational speed (n) of the circulating means (24, 26) is set to a rotational speed (n (V | _St- )) which is smaller than a target rotational speed (n _so n), and the circulation time (T) is set to a circulation time which is greater than one of the predetermined Abtragsleistung corresponding target circulation time (T _so n); or upon detecting exceeding of the target filling amount (V _so n), a delivery amount (F) or a rotational speed (n) of the circulating means (24, 26) is set to a rotational speed (n (V | _St +)) which is larger is set as a target speed (n _so n), and the circulation time (T) is set to a circulation time which is smaller than a predetermined circulation time corresponding to the predetermined Abtragsleistung (T _so n).

4. The method according to any one of claims 1 to 3, characterized in that in

Step (c) an adjustment of the operating parameters is carried out such that speed fluctuations of the circulation pump (24) are minimized.

5. The method according to claim 4, characterized in that in step (c) deviating from a target circulation time Regel-Umwälzzeit is determined, so that in step (c) speed reduction by an extension of the recirculation time or in step (c ) speed increase is compensated by reducing the Umwälzzeit, so that the removal rate (AE) remains the same.

6. The method according to any one of claims 1 to 5, characterized in that prior to step (a) the load (S4), the removal rate (S6), the desired filling amount (Vsoii) and / or the target circulation time (T _so n) are determined.

7. Water-conducting household appliance, in particular dishwashing or

Washing machine, designed to carry out the method according to one of claims 1 to 6.