Patent Application
20050126602
The invention relates to a method for adapting a rinsing program in a dishwasher machine and a dishwasher machine for using this method.
In addition to the conventional use of dishwashing agent which is present in powder form and is inserted in a dishwashing agent dispensing device usually located in the door of the dishwasher machine and is dispensed by this at a pre-determined time and in addition to the use of liquid rinse aid which is also inserted in a dishwashing agent dispensing device usually located in the door of the dishwasher machine and is dispensed by this at a pre-determined time and in a pre-determined quantity, agents in tablet or gel forms of administration have been known for some time, which not only contain the actual dishwashing agent but also those components required as consumables during a rinsing phase. Thus, for example, combination products have been known for some time, so-called “2 in 1 tabs” or “2 in 1 gels” which contain the rinse aid in addition to the dishwashing agent and “3 in 1 tabs” or “3 in 1 gels” which in addition to the dishwashing agent and the rinse aid, also contain a chemical which replaces the function of the softening device. According to the idea of the manufacturers of these tabs or gels, the respective components are used precisely at that time during the rinsing program run at which these components have their optimal effect.
However, since the rinsing program run depends both on the rinsing program selected in each case, the manufacturer of the dishwasher machine and also on individual model types, the use of tabs or gels can have the result that for example, the rinse aid is released into the rinsing solution at a time when no rinsing is taking place so that in an actual partial program section “rinse”, there is no more corresponding rinse aid. This is because in some known tabs or gels, the release of the rinse aid is merely coupled to the ambient temperature so that when this temperature is exceeded during a partial program section “clean”, rinse aid is released.
In another embodiment of the rinsing program it can be that the rinse aid is not activated so that likewise no rinsing effect is achieved, but the rinse aid is still present in undissolved form, for example, after the end of the rinsing program.
Since the rinse aid usually primarily has the function of breaking down the surface tension of the rinsing solution, the lack of rinse aid in the rinsing solution results in reduced flowing away of the residual water remaining on the items to be cleaned in the partial program section “dry” which yields a substantially inferior drying result compared with the use of a rinsing solution with a rinse aid component.
When using tabs or gels with a corresponding chemical which replaces the function of the softening device, the disadvantage similarly arises that the quantity of chemical located in the tabs or gels is not matched to all degrees of water hardness so that depending on the particular region, the use of tabs or gels either reduces the degree of hardness too much or does not sufficiently reduce the degree of hardness. In particular, the use of water with insufficiently reduced water hardness results in a lower efficiency of the dishwashing agent and the rinse aid and a substantially inferior cleaning and drying result is thereby achieved.
As a consequence of this use of tabs or gels, the user of the dishwasher machine can detect that the cleaning performance and/or the drying performance is not satisfactory and in many cases causatively attributes this result to the dishwasher machine although the cause lies mainly in the use of tabs or gels.
The object of the present invention is thus to provide a method which allows the rinsing program run of a dishwasher machine to be adapted so that even when using a wide range of combination dishwashing agents, a satisfactory cleaning and drying performance is achieved.
This object is solved by the method according to the invention with the features according to claim 1 and by the dishwasher machine with the features according to the further independent claim. Advantageous further developments of the inventions are characterised in the dependent claims.
In the method for adapting a rinsing program in a dishwasher machine according to the invention, the rinsing program run is adapted if it is detected that no rinse aid has been added and if the dishwasher machine is operating and/or if it is detected that there is a lack of salt and if the softening device is switched off and if the dishwasher machine is operating. By detecting the lack of rinse aid in conjunction with the operation of the dishwasher machine, it is established that either the user has forgotten to put in the rinse aid or that the tabs or gels described are being used. By detecting the lack of salt in conjunction with a switched-off softening device and with the dishwasher machine being on, it can be established without any doubt that tabs or gels are being used. In all cases, an adaptation of the rinsing program without any intervention of the user is provided according to the invention to achieve a satisfactory cleaning and drying performance.
According to a preferred feature of the invention, if it is detected that no rinse aid has been added and if the dishwasher machine is operating, during the rinsing program the number of changes of the solution in a partial program step “intermediate rinse” is reduced and/or the number of changes of solution in a partial program step “rinse” and/or the duration of a partial program step “dry” and/or the temperature associated therewith is increased. A reduced number of changes of solution in the partial program step “intermediate rinse”, which is usually operated with clear water, makes it possible to reuse the cleaning solution in the rinsing whereby, if necessary, this “carried away” solution can take over the rinsing functions. An elevated temperature of the rinsing solution, especially in rinsing makes it possible to achieve better evaporation of the residual liquid remaining on the items to be cleaned which have been heated with the rinsing solution and thus makes it possible to achieve a satisfactory drying result. Lengthening of the rinsing also helps to achieve satisfactory heating and satisfactory residual cleaning of the items to be cleaned. The increase in temperature in the rinsing naturally also brings about an increased temperature in the drying, this lengthening ensuring a better evaporation of the residual liquid.
According to a further preferred feature of the invention, if it is detected that there is no salt during the rinsing program, the softening device, despite being switched off, is started up to soften the water and that if necessary, a lack-of-salt display is started up despite being switched off. As a result of using softened water for the cleaning and rinsing, which is thereby made possible, a better efficiency of these additives is achieved. The lack-of-salt display started up despite being switched off shows the user the special case in the cleaning action.
The present invention has succeeded in providing a method which allows the rinsing program run of a dishwasher machine to be adapted so that a satisfactory cleaning and drying performance is achieved even when using a wide range of combination dishwashing agents.
More appropriately, the lack of consumables is detected by means of a level of consumables in an associated supply container being too low. Sensors usually present in any case are thus used for further advantageous measures.
According to an advantageous embodiment of the invention, the lack of consumables is detected by means of a sensor to measure the properties of the corresponding cleaning liquid. In contrast to the alkaline cleaning solution, the rinsing solution is acid when rinse aid is added. In addition to the higher degree of hardness, non-softened water also has a different pH to softened water. Thus, the sensor for measuring the properties of the rinsing solution is advantageously a pH sensor or a water hardness sensor.
With such a sensor the concentration of any rinse aid still present in the rinsing solution can be determined by a comparison with a pre-determined value. Thus, in an especially advantageous fashion during the rinsing program the number of changes of the solution in a partial program step “intermediate rinse” and/or “rinse” and/or the duration of a partial program step “dry” and/or the temperature associated therewith is adapted according to the detected value.
With such a sensor the residual hardness of the filled water can naturally also be determined by a comparison with a pre-determined value. Thus, in a likewise especially advantageous fashion, if it is detected that there is a lack of salt during the rinsing program, the softening device, despite being switched off, is started up to soften the water to a minimum value in accordance with the detected value and if necessary, a lack-of salt display is started up despite being switched off. Since it is known that the chemical contained in the tabs or gels, which should replace the function of the softening device, acts up to about 25° dH, the minimum degree of hardness according to the regulations is about 25° dH.
The aforesaid object is solved by a dishwasher machine according to the invention for using a method according to one of the preceding claims.
According to an advantageous embodiment of the invention, a sensor for measuring the properties of the corresponding cleaning liquid is arranged.
The sensor for measuring the properties of the corresponding cleaning liquid is advantageously a pH sensor or a water hardness sensor.
The present invention has succeeded in providing a method which allows the rinsing program run of a dishwasher machine to be adapted so that even when a wide range of combination dishwashing agents are used, a satisfactory cleaning and drying performance is achieved.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10238304.9 | Aug 2002 | DE | national |
| PCT/EP03/09245 | Aug 2003 | WO | international |
