WO2019201408A1

WO2019201408A1 - Electronic domestic appliance

Info

Publication number: WO2019201408A1
Application number: PCT/EP2018/000211
Authority: WO
Inventors: Joachim Krieger; Christoph HEINLE
Original assignee: Diehl Ako Stiftung & Co. Kg
Priority date: 2018-04-19
Filing date: 2018-04-19
Publication date: 2019-10-24
Also published as: DE112018007497A5

Abstract

The invention relates to an electronic domestic appliance (10) such as a laundry treatment device, comprising a unit (18, 24, 26, 30, 34) for running a predefined treatment program of said domestic appliance (10), a sensor system (40a.. i) for acquiring measurement values relating to an operating parameter of the domestic appliance (10), and a control device (36) for actuating said unit (18, 24, 26, 30, 34) depending on the measurement values acquired by the sensor system (40a...i). To efficiently determine the operating parameter values of the domestic appliance (10), the sensor system (40a...i) comprises at least one wirelessly interrogable passive surface wave sensor (50), and the control device (36) is provided with a transceiver (42) for wirelessly communicating with the at least one surface wave sensor (50) of the sensor system (40a...i).

Description

Electronic home appliance

The present invention relates to an electronic household appliance, in particular an electronic household appliance with an efficient determination of current operating parameter values of the domestic appliance.

Electronic household appliances such as laundry treatment equipment (eg washing machines, dryers), dishwashers, refrigerators and freezers, cooking appliances (eg cookers, hobs, microwave ovens) and the like usually have at least aggregate (eg drive motor of a laundry drum, etc.) for performing a predetermined Treatment program (eg washing program, drying program, etc.), at least one sensor for detecting measured values to an operating parameter (eg speed of the laundry drum, loading the laundry drum, etc.) and a control device for controlling the at least one unit depending on the recorded measured values. Depending on the type and embodiment of the household appliance, a larger number of sensor systems for acquiring measured values for a large number of operating parameters is required in order to be able to achieve optimum control of the aggregates of the domestic appliance. For this purpose, extensive cabling between the sensor systems and the control device, complex sensor systems and / or complex data evaluations are required in conventional household appliances.

The invention has for its object to provide an electronic household appliance, in which an efficient determination of the operating parameter values is possible. In particular, the cabling effort between sensor and controller should be significantly reduced.

This object is achieved by an electronic household appliance with the features of claim 1. Particularly advantageous embodiments and modifications of the invention are the subject of the dependent claims. The electronic household appliance according to the present invention has an aggregate for carrying out a predetermined treatment program of the household appliance, a sensor system for acquiring measured values for an operating parameter of the domestic appliance and a control device for controlling the aggregate as a function of the measured values detected by the sensor system and is characterized in that the sensor system has at least one passively surface wave sensor that can be interrogated by wireless means and that the control device is provided with a transceiver for wireless communication with the at least one surface wave sensor of the sensor system.

The use of wirelessly interrogatable, passive surface acoustic wave sensors for sensor technology leads to numerous advantages in connection with electronic household appliances. The wireless communication between the surface acoustic wave sensor and the controller eliminates the need for wiring, making the manufacture of the domestic appliance simpler and less expensive and, on the other hand, allowing more sensors to be used as needed. Since surface wave sensors can also be installed in confined spaces and on moving parts, the possibilities of recording measured values to operating parameters are expanded. Since surface wave sensors are robust, they are replaceable in many ways and thus expand the possibilities for acquiring measured values. Since surface wave sensors do not require their own energy source despite the wireless operation, they can be installed to save space and can account for a corresponding maintenance. In addition, the measured values of several sensors can be evaluated with only one control device, so that different embodiments of a household appliance can be realized by adding or omitting individual sensors, without having to adapt the wiring in the household appliance or the hardware of the control device. Furthermore, surface wave sensors can be integrated in a simple manner, for example, by encapsulation in plastic parts, without that would be created by a line connection a sealed point. Overall, the use of surface wave sensors in the sensor technology of household appliances on the one hand cost-effective and simple and modular solutions for existing sensor systems and on the other hand also completely new sensor concepts that could not be realized in household appliances or only with great effort. For example, household appliances for different market segments with different sensory number of sensor systems and / or different numbers and positions of surface acoustic wave sensors without having to modify the hardware of the control device and its transceiver.

The domestic appliance according to the invention has, more precisely, at least one unit. Likewise, the household appliance according to the invention, a more accurate at least one sensor. Furthermore, the household appliance according to the invention has a control device, wherein exactly one control device can communicate with a plurality of sensor systems, but depending on the application, two or more control devices can nevertheless be provided.

The prescribed treatment program should in particular be a fixed program or a program selected from several predefined programs automatically or by a user. In addition, the predetermined treatment program may include fixed program parameters and / or variable program parameters.

The sensor system acquires measured values for an operating parameter. This is intended to include the acquisition of one or more measured values for one operating parameter or for a plurality of operating parameters. A measured value for an operating parameter is intended to include a measured value which directly indicates an operating parameter value or a measured value from which an operating parameter value can be determined.

The wirelessly interrogatable surface wave sensors can be activated and interrogated, in particular by radio. Accordingly, the transceiver of the control device is designed in particular for communication by radio with the surface acoustic wave sensors.

The control device is provided with a transceiver. The transceiver may in particular be a component integrated into the control device or a separate component connected to the control device. Wirelessly interrogatable surface acoustic wave sensors have been known for some time. With regard to the structure and mode of operation of surface acoustic wave sensors, reference is made by way of example to WO 03/078950 A1 and DE 42 17 049 A1.

In one embodiment of the invention, the home electronic appliance is a laundry treatment appliance (e.g., washing machine, clothes dryer, etc.) having a laundry drum for receiving laundry to be treated. In this case, the unit is, for example, a drive motor of the laundry drum, a heater for the water to be supplied to the tub, a conveyor (pump and / or valve) for the water to be supplied to the tub, a delivery device (pump and / or Valve) for the detergent to be supplied to the tub, a conveyor (pump and / or valve) for the container to be removed from the lye container water or the like. In this embodiment, the sensor is preferably designed and arranged to detect a level of a tub, of chemical substances in a liquor in a tub, a speed of the laundry drum, a load of the laundry drum, an imbalance of the laundry drum, a temperature or Temperature distribution in the laundry drum, a temperature of a liquid supplied to a tub, a level of a detergent container, a temperature of a liquid flowing out of a tub, chemicals of a liquid draining from a tub, moisture in the laundry drum, or a closed state of an access opening to the laundry drum.

In an advantageous embodiment of the invention, the at least one surface wave sensor of the sensor for detecting a load and / or imbalance of the laundry drum is configured and arranged to a force or pressure value in a damper of the tub or the oscillating system, in a suspension of the tub or of the oscillating system or in an attachment of a damper of the tub or the oscillating system.

For example, in conventional laundry treatment equipment, load and / or unbalance detection sensors in the dampers or suspensions of the laundry drum which are wired to the control means are evaluating acceleration sensors on the tub which are wired to the control means defined acceleration ramps of the engine speed or evaluations of motor current fluctuations used. Compared to these conventional concepts, the use of surface wave sensors according to the invention with a simple design and simple assembly leads to a simple and efficient recording of measured values from which the loading or the imbalance of the laundry drum can be determined directly or indirectly.

In an advantageous embodiment of the invention, the at least one surface wave sensor of the sensor system for detecting the fill level of the tub or of chemical substances in the liquor in the tub or the speed of the laundry drum is arranged in a wall of the tub.

In this embodiment, the at least one surface wave sensor of the sensor may preferably be potted with the tub. That The surface wave sensors can be integrated in the production of the tub in a Montagespritzgießprozess in the tub. The tub is preferably made of a plastic material.

In this embodiment, the at least one surface wave sensor of the sensor system for detecting chemical substances in the liquor in the tub may preferably be covered by the interior of the tub by a partially permeable membrane. For example, the membrane may be selective to certain chemicals so that certain wash chemicals can be detected with the underlying surface wave sensor.

Furthermore, in this embodiment, the at least one surface wave sensor of the sensor system for detecting a temperature or temperature distribution in the laundry drum or the moisture in the laundry drum can be arranged in a wall of the laundry drum. Preferably, this at least one surface wave sensor of the sensor is encapsulated with the laundry drum.

In another embodiment of the invention, the electronic household appliance is a dishwasher with a washing compartment for receiving items to be washed. In this case, the unit is, for example, a heater for the room to be supplied water, a conveyor (pump and / or valve) for the water to be supplied to the washing room, a conveyor (pump and / or valve) for the washing room to be supplied rinse, a conveyor (pump and / or valve) for the out of the washroom water to be discharged or the like. In this embodiment, the sensor system is preferably designed and arranged for detecting a level of a liquor in the washing compartment, of chemical substances in a liquor in the washing compartment, a loading of the washing compartment, a temperature of a conveyed to the washing liquid, a level of a detergent tank, a temperature a liquid draining from the washing compartment, of chemical substances in a liquid draining out of the washing compartment or a closing state of an access opening to the washing compartment.

In another embodiment of the invention, the home electronic appliance is a refrigerator and / or freezer with a cold room for holding refrigerated stores. In this case, the unit is, for example, a heat exchanger for cooling the cooling space. In this embodiment, the sensor system is preferably designed and arranged for detecting an occupancy of the cooling space, a temperature of the cooling space, a temperature distribution in the cooling space, a humidity in the cooling space or a closed state of an access opening to the cooling space.

In yet another embodiment of the invention, the household electronic appliance is a cooking appliance (e.g., oven, hob, microwave oven, etc.) having a cooking cavity for receiving food (e.g., oven or microwave oven interior, hob zone, etc.). In this case, the unit is, for example, a circulating air heater, a grill, a hob zone or the like. In this embodiment, the sensor is preferably designed and arranged for detecting a Bele- tion of the cooking chamber, a temperature of the cooking chamber, a temperature distribution in the cooking chamber, a temperature of the food in the cooking chamber or a closed state of an access opening to the cooking chamber.

In an advantageous embodiment of the invention, a plurality of sensor systems are provided, each with at least one surface wave sensor. In this case, the plurality of surface acoustic wave sensors are preferably configured differently, so that the Control device can differentiate from which of the plurality of surface acoustic wave sensors the parameter values received via the transceiver originate.

In a further advantageous embodiment of the invention, the sensor system has a plurality of surface acoustic wave sensors, which are configured differently, so that the control device can differentiate from which of the plurality of surface acoustic wave sensors the parameter values received via the transceiver originate.

The invention also relates to a control device for an above-described electronic household appliance according to the invention with an aggregate for performing a predetermined treatment program of the household appliance and a sensor for detecting measured values to an operating parameter of the household appliance, wherein the control device is designed for driving the unit in dependence from the measured values recorded by the sensors. According to the invention, the control device is provided with a transceiver for wireless communication with at least one wirelessly interrogatable, passive surface wave sensor of the sensor system.

The above and other features and advantages of the invention will become more apparent from the following description of preferred, non-limiting embodiments with reference to the accompanying drawings. In it show, mostly schematically:

1 shows a representation of an inventively designed laundry treatment device.

FIG. 2 is a greatly simplified illustration of two sensor systems of the laundry treatment appliance of FIG. 1; FIG.

FIG. 3 shows a greatly simplified illustration of a further sensor system of the laundry treatment appliance of FIG. 1; FIG.

4 shows a greatly simplified illustration of a sensor system from FIG. 2 according to an exemplary embodiment of the invention; and Fig. 5 is a perspective view of an exemplary surface acoustic wave sensor as may be used for the domestic appliance of the invention.

In Fig. 1, the structure of a washing machine as an example of a home electronic appliance according to the present invention is shown greatly simplified.

The washing machine 10 has a housing 12, in which a laundry drum 14 is arranged for receiving laundry. The laundry drum 14 is rotatably mounted within a storage container 16 and is driven by a drive motor 18 (first unit). The drive motor 18 is for example attached to the tub 16 and connected to the drive shaft of the laundry drum 14 via a drive belt.

The tub 16 and the oscillating system formed from the tub 16 and the laundry drum 14 is mounted on the shock absorber 20 and suspensions 21 in the housing 12 of the washing machine 10.

The washing machine 10 has a water inlet 22 which is connectable to a water supply. The water inlet 22 is connected via a feed line 25 to the interior of the tub 16. In the feed line 25 are a conveyor 24 (second unit), e.g. a water pump and / or a valve, and a heater 26 (third unit) is provided. A feed line 29 for adding detergent to a detergent container 28 also opens into the feed line 25. In the feed line 29 there is provided a further conveying device 30 (fourth unit), which is e.g. a detergent pump and / or a valve. About the supply line 25 so the tub 16, a water-detergent mixture or water can be supplied.

For deriving the wash liquor from the tub 16 this is connected via a drain line 33 with a water outlet 32. In this discharge line 33, a further conveying device 34 (fifth unit) is provided which has, for example, a water pump and / or a valve. The aggregates 18, 24, 26, 30, 34 of the washing machine 10 are actuated by a control device 36 in order to carry out a predetermined washing or centrifuging program. The predetermined wash or spin program can be selected by a user via a control panel 38 from several standard programs and adjusted as desired.

The control of the various units 18, 24, 26, 30, 34 by the control device 36 takes place taking into account several operating parameters. To determine the current operating parameter values, a plurality of sensor systems 40a..i are provided in the washing machine 10, which detect corresponding measured values for the desired operating parameters. In the case of the washing machine 10 according to the invention, these sensor systems 40a... I are each equipped with one or more passive surface-wave sensors 50 which can be interrogated by radio. In addition, the controller 36 is provided with a transceiver 42 which can wirelessly communicate with the surface acoustic wave sensors 50 wirelessly.

The structure of a surface acoustic wave sensor 50, as it can be used for the sensors 40a..i of the washing machine 10, is shown by way of example in FIG.

The surface acoustic wave sensor 50 has a base body 60 having piezoelectric properties, for example, a piezoelectric single crystal. On the base body 60, a transducer 64, which serves as an input transducer and output transducer in this example, and a plurality of reflectors 66 are provided. The transducer 64 is also connected to an antenna 62.

The transceiver 42 of the controller 36 transmits a polling pulse 68 received by the antenna 62 of the surface acoustic wave sensor 50. The electromagnetic interrogation pulse 68 is converted by the transducer 64 due to the piezoelectric effect of the base body in mechanical waves / surface acoustic waves, which run over the base body 60 and reflected at the reflectors 66. The transducer 64 re-converts the reflected waves due to the piezoelectric effect of the base body into a corresponding electromagnetic response signal 70, which is received by the transceiver 42 of the control device 36 as a measurement signal. The response signal 70 is a pulse train that depends on the arrangement of the reflectors 66 and the propagation of the waves on the base body 60.

Depending on the sensor system, the surface wave sensor 50 can detect different measured variables, such as, for example, force, pressure, strain, temperature, humidity, chemical substances or the like. If, for example, a pressure is exerted on the surface wave sensor 50 or its base body 60, the propagation of the waves on the base body 60 thereby changes, as a result of which the response signal 70 generated by the transducer 64 ultimately changes. For example, the pause times between the pulses of the response signal 70 are changed by a change in the propagation speed of the waves on the base body 60. From the change of the response signal 70, the control device 36 can then determine a measured value for the respective measured variable.

If a plurality of sensor systems 40a..i and correspondingly a plurality of surface acoustic wave sensors 50 are present, the surface acoustic wave sensors 50 differ in the arrangement and / or position and / or number of their reflectors 66, so that the control device 36 receives the response signals 70 received from the transceiver 42. NEN surface wave sensors 50 can differentiate and thus can distinguish from which sensor 40a .. i and which surface wave sensor 50 within a sensor 40a .. i come from the received measurements. The response signals 70 of the various surface wave sensors 50 differ in particular in the pulse sequences and the time intervals of the pulse sequences to the interrogation pulse.

In the exemplary embodiment of FIG. 1, a first sensor system 40a with at least one surface wave sensor 50 on the tub 16 for detecting a fill level of the wash liquor in the tub 16, a second sensor 40b with at least one surface wave sensor 50 on the tub 16 for detecting certain chemical Substances in the tub 16, a third sensor 40c with at least one surface wave sensor 50 on the tub 16 for detecting a speed of the washing drum 14, a fourth sensor 40d with at least one surface wave sensor 50 on one or more dampers 20 of the oscillating system 14, 16 for detecting a loading and / or an imbalance of the laundry drum 14, a fifth sensor system 40e with at least one surface wave sensor 50 on one or more hinges 21 of the oscillating system 14, 16 for detecting a load and / or imbalance of the laundry drum 14, a sixth sensor 40f having at least one surface wave sensor 50 on the supply line 25 for detecting a temperature of the water inlet into the tub 16, a seventh Sensor system 40g with at least one surface wave sensor 50 on the detergent container 28 for detecting a filling level of the detergent container 28, and an eighth sensor system 40h with at least one surface wave sensor 50 on the discharge line 33 for detecting a temperature and / or chemical substances of the water outlet from the lye container 16 intended. Of course, individual sensors 40a..h can also be dispensed with or further sensor systems can be provided. Of course, not all sensor systems of the washing machine 10 must be equipped with surface wave sensors 50, but in some cases conventional sensor systems can also be used. 2 shows an enlarged view of the first sensor 40a and the second sensor 40b and a further ninth sensor 40i.

The surface acoustic wave sensors 50 of the first and second sensor systems 40a, 40b are integrated into the plastic tub 16 by being molded during production of the tub 16 with the latter in a mounting injection molding process.

The surface wave sensors 50 of the first sensor 40a are positioned along the circumference of the tub 16 and detect the level of the wash in the tub 16 by detecting the liquid level 44 in the tub 16. For example, they can detect the different temperatures of air and water in the tub.

The surface wave sensors 50 of the second sensor system 40b are also positioned along the circumference of the tub 16 and detect the presence of certain chemicals in the wash liquor in the tub 16 to determine, for example, the detergent concentration of the liquor or the level of soiling of the wash or liquor , As illustrated in FIG. 4, the surface acoustic wave sensors 50 of the second sensor system 40b may, for example, be integrated into the tub 16 in a multilayer structure. That is, the surface acoustic wave sensors 50 are covered to the interior of the tub 16 out with a membrane 52. This membrane 52 is, for example, selective for certain chemicals, so that the surface wave sensors 50 behind the membrane 52 can then detect the corresponding chemicals in the wash liquor.

The ninth sensor 40i shown in Fig. 2 is for detecting a closed state of an access opening to the laundry drum 14 through a corresponding door 46. The surface wave sensors 50 of the ninth sensor 40i are for this purpose, for example in the storage area 48 of the door 46 and / or in the edge region the access opening positioned.

Fig. 3 shows an enlarged view of the third sensor 40c. The surface acoustic wave sensors 50 of the third sensor 40c are positioned on the wall of the tub 16, and the outer periphery of the laundry drum 14 is formed with a specific profile. In this way, the surface acoustic wave sensors 50 can detect the rotational speed of the laundry drum 14 relative to the tub 16 by detecting a changing distance of the outer periphery of the laundry drum 14 to the tub 16 while the laundry drum 14 is rotating.

The surface acoustic wave sensors 50 of the fourth and fifth sensors 40d, 40e can detect, for example, a sinking or induced force on the shock absorbers 20 or the suspensions 21 or their attachments. The control device 36 can then perform a load measurement or unbalance detection of the laundry drum 14 in real time from these measured values.

For example, the following further sensor systems with surface wave sensors are conceivable in connection with laundry treatment appliances: sensors for detecting a torque on the axis of the drive motor 18 of the laundry drum 16, sensors with spatially distributed surface wave sensors for detecting temperature or humidity for improving a drying process in tumble dryers, and the like.

In other household appliances, other sensors with surface wave sensors can also be used to acquire measured values of other measured variables. men. With the help of surface wave sensors with which chemical substances can be detected, for example, the presence of cleaning agents, the concentration of cleaning agents, the presence of pyrolysis products (to prevent the burning of baked goods), the lactic acid fraction (for fresh determination of milk, for example in milk frothers or coffee machines), the existence of spoiled food in refrigerators, etc. are detected. With the help of surface wave sensors with which the temperature can be detected, for example, the temperature distribution on a baking sheet ("intelligent baking sheet" with integrated surface wave sensors), the temperature of grilled food, roasting, etc. (penetration temperature sensors), etc. can be detected.

BEZUGSZIFFERNUSTE

10 home appliance, e.g. Washing machine

12 housing

14 laundry drum

16 tubs

18 first aggregate, e.g. Drive motor for laundry drum

20 (shock) damper of the tub

21 Suspension of the tub

22 water intake

24 second aggregate, e.g. Conveying device (water pump and / or valve)

25 supply line

26 third aggregate, e.g. heater

28 detergent container

29 supply line

30 fourth aggregate, e.g. Conveying device (detergent pump and / or valve)

32 water drainage

33 drain line

34 fifth aggregate, e.g. Conveying device (water pump and / or valve)

36 control device

38 control panel

40a first sensor, e.g. for level of the tub

40b second sensor, e.g. for chemical substances in the lye in the tub

40c third sensor, e.g. for speed of the laundry drum

40d fourth sensor, e.g. for loading / unbalance of the laundry drum

40e fifth sensor, e.g. for loading / unbalance of the laundry drum

40f sixth sensor, e.g. for temperature of the water inlet

40g seventh sensor, e.g. for filling level of the detergent container

40h eighth sensor, e.g. for temperature or chemistry of water drainage

40i ninth sensor, e.g. for closed state of the access opening

42 transceivers

44 Liquid level in the tub

46 Door for closing the access opening 48 Storage of the door

50 surface wave sensor

52 Cover for surface wave sensor

60 Base Body with Piezoelectric Properties 62 Antenna

64 transducers

66 reflectors

68 polling pulse

70 response signal

Claims

Electronic household appliance (10), comprising:

an aggregate (18, 24, 26, 30, 34) for performing a predetermined treatment program of the household appliance (10);

a sensor system (40a .. i) for acquiring measured values for an operating parameter of the household appliance (10); and

a control device (36) for driving the unit (18, 24, 26, 30, 34) as a function of the measured values detected by the sensor system (40a .. i), characterized in that

the sensor system (40a .. i) has at least one wirelessly interrogatable, passive surface wave sensor (50), and

the control device (36) is provided with a transceiver (42) for wireless communication with the at least one surface wave sensor (50) of the sensor system (40a..i).

Domestic appliance according to claim 1, wherein the domestic appliance (10) is a laundry treatment appliance with a laundry drum (14) for receiving laundry to be treated, in which

the sensor system (40a..i) is designed and arranged for detecting a fill level of a tub (16), of chemical substances in a liquor in a tub (16), a speed of the laundry drum (14), a loading of the laundry drum ( 14), an imbalance of the laundry drum (14), a temperature or temperature distribution in the laundry drum (14), a temperature of a liquid supplied to a tub (16), a level of a detergent container (28), a temperature of a tub (16) draining liquid, of chemical substances in a liquor from a lye container (16) effluent, a moisture in the laundry drum (14) or a closed state of an access opening to the laundry drum (14).

3. Household appliance according to claim 2, wherein the at least one surface wave sensor (50) of the sensor system (40d, 40e) for detecting a load and / or an imbalance of the laundry drum (14) is designed and arranged to provide a force or pressure value in a damper (20) of the tub (16). or the oscillating system (14, 16), in a suspension (21) of the tub (16) or the oscillating system (14, 16) or in a mounting of a damper (20) of the tub (16) or the oscillating system (14 , 16).

Domestic appliance according to claim 2 or 3, in which

the at least one surface wave sensor (50) of the sensor system (40a, 40b, 40c) for detecting the level of the tub (16) or chemicals in the liquor in the tub (16) or the speed of the laundry drum (14) in a wall of the tub (16) is arranged.

Domestic appliance according to claim 4, in which

the at least one surface wave sensor (50) of the sensor system (40a, 40b, 40c) is potted with the tub (16).

Domestic appliance according to claim 5, in which

the at least one surface wave sensor (50) of the sensor system (40b) for detecting chemical substances in the liquor in the tub (16) to the inside of the tub (16) is covered by a partially permeable membrane (52).

Domestic appliance according to one of claims 2 to 6, in which

the at least one surface wave sensor (50) of the sensor system for detecting a temperature or temperature distribution in the laundry drum (14) or the moisture in the laundry drum (14) is arranged in a wall of the laundry drum (14).

Domestic appliance according to claim 7, in which

the at least one surface wave sensor (50) of the sensor system is cast with the laundry drum (14).

9. Household appliance according to claim 1, wherein the household appliance (10) is a dishwasher with a washing compartment for receiving items to be washed, in which

the sensor system (40a..i) is designed and arranged for detecting a filling level of a liquor in the washing compartment, of chemical substances in a liquor in the washing space, a loading of the washing space, a temperature of a liquid conveyed to the washing space, a filling level of one Detergent container, a temperature of a liquid flowing out of the washing compartment, of chemical substances in a liquid flowing out of the washing compartment or a closed state of an access opening to the washing compartment.

10. Household appliance according to claim 1, wherein the household appliance (10) is a refrigerator and / or freezer with a cooling space for receiving refrigerated stores, in which

the sensor system (40a .. i) is designed and arranged for detecting an occupancy of the cooling space, a temperature of the cooling space, a temperature distribution in the

Refrigerator, a humidity in the refrigerator or a closed state of an access opening to the refrigerator.

1 1. Household appliance according to claim 1, wherein the household appliance (10) is a cooking appliance with a cooking chamber for receiving food, in which

the sensor system (40a .. i) is configured and arranged for detecting an occupancy of the cooking chamber, a temperature of the cooking chamber, a temperature distribution in the cooking chamber, a temperature of the food in the cooking chamber or a closed state of an access opening to the cooking chamber.

12. Household appliance according to one of the preceding claims, in which

a plurality of sensor systems (40a..i) each having at least one surface wave sensor (50) are provided, wherein the plurality of surface acoustic wave sensors (50) are configured differently, so that the control device (36) can differentiate from which of the plurality of surface acoustic wave sensors that over

Transceiver (42) received parameter values.

13. Household appliance according to one of the preceding claims, wherein the sensor system (40a .. i) comprises a plurality of surface acoustic wave sensors (50) which are configured differently, so that the control device (36) can differentiate from which of the plurality of surface acoustic wave sensors over the Transceiver (42) received parameter values.

14. Control device (36) for an electronic household appliance (10) according to one of the preceding claims with an aggregate (18, 24, 26, 30, 34) for performing a predetermined treatment program of the household appliance (10) and a sensor (40 a. i) for acquiring measured values relative to an operating parameter of the household appliance (10), wherein the control device (36) is designed to drive the aggregate (18, 24, 26, 30, 34) as a function of the sensor system (40a .. i) recorded measured values,

characterized in that

the control device (36) is provided with a transceiver (42) for wireless communication with at least one wirelessly interrogatable, passive surface wave sensor (50) of the sensor system (40a .. i).