Water-conducting household appliance, system with water-conducting household appliance and method for operating a water-conducting household appliance

Abstract

The invention relates to a water-conducting household appliance (1), in particular a dishwasher, comprising: a conductivity sensor (15) for detecting a conductivity of the water (F) supplied to the household appliance (1), a storage unit (16) for storing a number N of conductivities detected by means of the conductivity sensor (15), with N ≥ 1, a determination unit (17) for determining a change in the conductivity of the water (F) supplied to the household appliance (1) based on the stored conductivities, a communication unit (18) for communicating with a water hardness database (40) arranged externally to the household appliance (1), which stores location-specific water hardnesses (41) for a plurality of different locations (36), and a determination unit (19) for determining at least one action based on the determined change in the conductivity and / or a value provided by the water hardness database (40),for the location (36) of the household appliance (1) site-specific water hardness (41).,

Claims

[1] Water-conducting household appliance (1), in particular a dishwasher, comprising: a conductivity sensor (15) for detecting a conductivity of the water (F) supplied to the household appliance (1), a storage unit (16) for storing a number N of conductances detected by the conductance sensor (15), with N ≥ 1, a determination unit (17) for determining a change in the conductivity of the water (F) supplied to the household appliance (1) based on the stored conductivity values, a communication unit (18) for communication with a water hardness database (40) arranged externally to the household appliance (1), which stores location-specific water hardnesses (41) for a plurality of different locations (36), and a determination unit (19) for determining at least one action based on the determined change in the conductivity and / or a location-specific water hardness (41) provided by the water hardness database (40) for the location (36) of the household appliance (1). [2] Water-conducting household appliance according to claim 1, characterized by that the conductivity sensor (15) is arranged in a pump pot (21) of the household appliance (1). [3] Water-conducting household appliance according to claim 2, characterized by that the conductivity sensor (15) is designed to detect the conductivity when the household appliance (1) is put into operation for the first time using fresh water (F) in the pump pot (21). [4] Water-conducting household appliance according to claim 1, characterized by that the conductivity sensor (15) is arranged in a water inlet (25) of the household appliance (1). [5] Water-conducting household appliance according to claim 4, characterized bythat the conductivity sensor (15) is designed to detect the conductivity several times, in particular cyclically, using fresh water (F) from the water inlet (25). [6] Water-conducting household appliance according to one of claims 1 to 5, characterized by that the determination unit (17) is designed to detect an exceeding of a threshold value (SW) on the basis of the number N of stored conductance values. [7] Water-conducting household appliance according to claim 6, characterized by that the determination unit (19) is set up to control a user interface (44) when the threshold value (SW) is exceeded in such a way that the user interface outputs an indication that the threshold value (SW) has been exceeded. [8] Water-conducting household appliance according to claim 7, characterized bythat the determination unit (17) is designed to calculate a theoretical water hardness by means of a polynomial function based on the number N of conductance values stored using the storage unit (16). [9] Water-conducting household appliance according to claim 8, characterized by in that the communication unit (18) is configured to receive the location-specific water hardness (41) of the water hardness database (40), wherein the determination unit (19) is configured to compare the calculated theoretical water hardness and the received location-specific water hardness (41) with one another. [10] Water-conducting household appliance according to claim 9, characterized by that the determination unit (19) is configured to control the user interface (44) in such a way that it outputs an indication based on the result of the comparison between the calculated theoretical water hardness and the location-specific water hardness (41). [11] Water-conducting household appliance according to claim 9 or 10, characterized by that the determination unit (19) is configured to control the communication unit (18) in such a way that it changes the location-specific water hardness (41) of the water hardness database (40). [12] Water-conducting household appliance according to one of claims 7 to 11, characterized by that the determination unit (19) is designed to control the user interface (44) in such a way that it outputs an instruction for descaling the household appliance (1), outputs an instruction for dosing an amount of detergent, and / or outputs an instruction for regenerating a water softening system (33) of the household appliance (1). [13] System with a plurality of water-conducting household appliances (1) according to one of claims 6 to 12, characterized bythat the determination unit (19) is designed to control the communication unit (18) when the threshold value (SW) is exceeded in such a way that it informs other household appliances (1) at the same location (36) about a change in the water hardness. [14] System comprising a water-conducting household appliance (1) according to one of claims 1 to 12 and a device (43) external to the household appliance (1) which integrates a user interface (44) for outputting an instruction to a user. [15] Method for operating a water-conducting household appliance (1), in particular a dishwasher, comprising: Detecting (S1) a conductivity of the water (F) supplied to the household appliance (1) by means of a conductivity sensor (15), Storing (S2) a number N of conductances detected by the conductance sensor (15) by means of a storage unit (16), with N ≥ 1, Determining (S3) a change in the conductivity of the water (F) supplied to the household appliance (1) based on the stored conductivity values by means of a determination unit (17), Receiving (S4) a location-specific water hardness (41) by means of communication of a communication unit (18) with a water hardness database (40) arranged externally to the household appliance (1), which stores location-specific water hardnesses (41) for a plurality of different locations (36), and Determining (S5) at least one action based on the determined change in the conductivity and / or the received location-specific water hardness (41) by means of a determination unit (19). [16] Computer program product which causes the method according to claim 15 to be carried out on a program-controlled device.

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