Patent Application
20210153710
Applicant claims priority under 35 U.S.C. § 119 of German Application No. 10 2019 131 583.2 filed Nov. 22, 2019, the disclosure of which is incorporated by reference.
The invention relates to a system with at least two automatically moving floor processing devices for the automatically controlled processing of a surface in an environment, a shared computing device allocated to the floor processing devices, which plans at least one operational activity of at least one floor processing device based on defined rules, and a shared database allocated to the floor processing devices, which stores an area map with several partial surface areas and the planned operational activity.
In addition, the invention relates to a method for operating such a system.
Automatically moving floor processing devices are known in prior art, for example as vacuuming robots, mopping robots, polishing robots, or others. For example, the floor processing devices have cleaning elements, such as brushes, mopping elements, polishing elements, sanding elements, or the like. Further known in prior art is to automatically steer floor processing devices, so as to perform floor processing activities in which the floor processing device processes a surface.
It is further known to use several automatically moving floor processing devices within a system, wherein the system further provides a shared computing device along with a shared database for the floor processing devices.
DE 10 2017 113 288 A1 (also published as US 2018/0361569 A1) discloses a system with several floor processing devices for the automatically controlled processing of a surface, wherein a shared database allocated to the floor processing devices has operational activities planned according to defined rules for the floor processing devices. The operational activities are automatically planned by a central computing device of the system, for example as a function of a contamination of a partial area of a surface detected by a floor processing device.
Proceeding from the aforementioned prior art, the object of the invention is to create a system with at least two independently moving floor processing devices, as well as a shared computing device and database allocated to the shared computing device, which can also consider individual queries by a user relative to a floor processing activity.
This object is achieved by storing a partial area designation and/or a floor type designation associated with the partial surface areas, wherein the computing device is set up to receive a floor processing command from a user of the system, with this floor processing command on the one hand indicating a floor processing activity to be performed, and on the other hand having a partial area designation and/or a floor type designation, wherein the computing device is set up to ascertain partial surface areas out of the plurality of partial surface areas contained in the area map that correspond to the partial area designation and/or floor type designation specified in the floor processing command, and according to predefined rules to plan the execution of the floor processing activity specified in the floor processing command by at least one floor processing device, wherein the rules depend on a device parameter of the floor processing device and a position of the partial surface area in the environment to be processed.
According to the invention, the system is thus designed to receive an individual floor processing command of a user, and analyze it relative to a desired floor processing activity in a defined partial surface area in the environment. For this purpose, the computing device of the system is designed to check the floor processing command for partial area designations and/or floor type designations contained therein as well as the indicated floor processing activity. To this end, the computing device compares the partial area designations and floor type designations stored in the database with the content of the floor processing command. If one or more correlations are found, the computing device determines which of the partial surface areas recorded in the area map have the respective partial area designation or floor type. The computing device then plans the floor processing activity requested by the user by means of the floor processing command for those partial surface areas that have the mentioned partial area designation and/or contain the designated floor type. The computing device plans the floor processing activity by selecting one or several floor processing devices of the system, wherein the selection takes place according to predefined rules, which depend on the device parameters of the available floor processing devices on the one hand, and on a location of the partial floor area to be processed on the other. The floor processing devices interconnected in the system are thus controlled by commands issued by a user based on various parameters. The computing device uses a mathematical algorithm to determine one or several floor processing devices best suited for a floor processing activity to be performed, wherein the computing device includes such a floor processing device in the plans for performing a floor processing activity, whose device parameter and position is optimal relative to the position of the partial surface area to be processed. Several floor processing devices can be planned for performing the floor processing activity, which are given a specific priority for performing the floor processing activity. The computing device can set a prioritization that first plans for an optimally suitable floor processing device, and in order of priority thereafter additional floor processing devices with device parameters and/or positions that are less optimal, e.g., for successfully performing the floor processing activity, than those of the floor processing device with a higher priority that was first prioritized. Those floor processing devices of the system having a lower prioritization than the floor processing device mentioned first can be provided for cases in which the favored floor processing device is not available, for example because it became stuck while performing the floor processing activity or is currently performing another activity. Regardless of a prioritization of several floor processing devices for performing the same floor processing activity, a chronological order of priority of the floor processing devices can be established for floor processing activities to be performed one after the other, wherein a first floor processing device performs a floor processing activity to be executed first, and a second floor processing device only finds application some time thereafter, so as to either continue the floor processing activity or perform an ensuing floor processing activity.
Within the meaning of the invention, a partial area designation is understood as a name for a specific partial surface area in the environment, for example which can correspond to a specific room designation in a home, e.g., living room, bedroom, hallway, but also fireplace area, dog corner, children's play area or the like. The partial surface areas do not have to correspond to entire rooms of a floorplan. Corresponding partial areas of a room are also partial surface areas that can likewise be given a partial area designation. For example, a floor type designation within the meaning of the invention includes an indication of whether a partial surface area has a hard floor, carpeted floor, or carpet. In addition, the floor types can be subdivided even further, in particular into long-pile carpeted floors, short-pile carpeted floors, tile floors, wood floors, laminate, cork floors, PVC and others. Floor processing activities within the meaning of the invention can include vacuuming, sweeping, mopping, polishing, sanding, oiling, impregnating, or others.
In particular, it is proposed that the floor processing command expressed by the user be a request comprised of several words, in particular a voice command, wherein the computing device is set up to derive from the floor processing command the indicated floor processing activity on the one hand, and the partial area designation and/or the floor type designation on the other, and possibly also a point in time relating to the floor processing operation. The user of the system according to the invention can transmit a floor processing command to the computing device in writing or orally. To this end, for example, the system can have a voice recognition software that can receive and analyze the floor processing command. Alternatively or additionally, the system can also have a user interface that is suitable for receiving a written floor processing command from the user. For example, the system can contain a mobile terminal of the user, in particular a mobile telephone, a tablet computer, a laptop or the like, by means of which the user can transmit the floor processing command. The components of the system, specifically the floor processing devices, the computing device, the database, and possibly also a terminal for receiving the floor processing command of the user are preferably interconnected within a wireless communications network, for example within a WLAN. The floor processing command of the user contains words combined into a request, which designate a partial area and/or a floor type to be processed on the one hand, and a floor processing activity on the other. The computing device, for example using a parser, breaks the floor processing command down into the constituents partial area designation and/or floor type designation and floor processing activity, so as to be able to plan a desired floor processing activity to be performed by at least one floor processing device of the system. If the user now transmits a voice command or text input to the computing device of the system, for example the “vacuum the kitchen” request, the computing device of the system determines the partial area designation “kitchen” on the one hand, and the floor processing activity “vacuum” on the other. The computing device then determines which floor processing device, or possibly which floor processing devices, are optimally suited for processing this partial surface area. In addition, the floor processing command of the user can also contain a time specification, in particular a point in time, at which the floor processing is to start or end. The user can basically also transmit other information via the floor processing command, for example a desired floor processing intensity, floor processing duration, or others.
It is proposed that the device parameter of the floor processing device be a floor processing element designed for a defined floor processing activity, a device variable, a charge status of an accumulator, a power level of an electric motor, a storage capacity of a collection container and/or a range, traveling speed or climbing ability of the floor processing device. For purposes of planning the floor processing devices present in the system for performing the floor processing activity desired by the user, consideration is thus given to properties of the floor processing devices that are rooted in particular in the type of respective floor processing device. On the one hand, this includes exterior properties of the floor processing device, for example the size, width, height, shape, ground clearance, and weight of the floor processing device. However, the device parameters can also be the parameters of cleaning elements that make up components of the floor processing device, for example floor processing elements such as cleaning brushes, mopping elements, polishing attachments, or the like. In addition, consideration can be given to the properties of an accumulator, in particular a charge status of the accumulator, or a power level of an electric motor. With respect to floor processing devices designed as vacuum cleaners, a device parameter can be a maximum storage capacity of a collection container for suction material, a current fill level of the collection container, a filter element, or the like. In addition, special capabilities of the floor processing device are also of interest, for example a range of the floor processing device owing to a charge status of an accumulator, a climbing ability of the floor processing device, a traveling speed of the floor processing device, or others.
In addition, it can be provided that the floor processing device specified for performing the floor processing activity be selected as a function of a distance and/or a height difference between the location of the partial surface area to be processed and a current position of the floor processing device. The height difference between the target location and current location of the floor processing device can be caused by different floors of a building, i.e., when the floor processing device moving toward the target has to overcome a building floor or even a landing, or the like. In selecting a suitable floor processing device for the floor processing activity to be performed, consideration is thus given to the position of the floor processing device in relation to the position of the partial surface area to be processed, for example to include whether basically suitable floor processing devices are positioned on the same coherent height level as the partial surface area, or whether these alternatively are able to overcome a height difference. For example, floor processing devices located on a different floor of a building than the partial surface area to be processed can basically perform this floor processing activity, but are unable to overcome the height difference, and can therefore not be included in the plan for performing the floor processing activity.
It is therefore achieved overall that one or several floor processing devices, which can be identical or different, are allocated for processing one or several partial surface areas. During allocation, consideration is given to device parameters on the one hand, but also to environmental parameters on the other. For example, device properties include characteristic configurations of the floor processing device that are especially suitable for performing a specific floor processing activity. The environmental parameters include the distance between the floor processing device and the desired partial surface area to be processed. An order of priority for the floor processing devices for processing the same partial surface area is established based on an algorithm implemented by the computing device, wherein wishes of the user relating to the starting time, ending time, or even a duration of floor processing can be considered. A partial surface area can optionally be divided into sub-areas, to which various floor processing devices can be allocated. For example, such a division can take place if one and the same room, for example a living room, has a hard floor on the one hand, and carpets lying on the hard floor on the other. The sub-areas can have allocated to them various floor processing activities, for example dry cleaning, wet cleaning, above-floor cleaning, or the like. In selecting a suitable floor processing device for performing a floor processing activity, consideration can also be given to a current position of the user; for example, use can preferably be made of those floor processing devices that are especially quiet within the partial surface area where the user is located at the time. A current location of the user can here be determined by a detection unit of a floor processing device, for example, or also based on a signal from a mobile terminal of the user.
It can be provided that the database of the system have information about the partial surface areas of the environment. The information about the partial surface areas can here in particular be a partial area designation, floor information relating to a floor of a building having the partial surface area, a floor type designation and/or a surface size of the partial surface area. The partial area designation can be a conventional designation of a room in the environment, for example living room, bathroom, hallway, bedroom, children's room, or the like. It is alternatively also possible that the partial area designation be a room number, an invented name, a number-word combination, or the like. For example, floor information can be broken down into cellar, ground floor, first floor, second floor, and the like. As already explained above, a floor type designation can be a designation such as hard floor, carpeted floor, carpet, or even finer divisions such as long-pile carpeted floor, short-pile carpeted floor, and the like. A surface size of the partial surface area can denote an area in square meters or other units, or alternatively an allocation to a specific surface area range, for example, e.g., 0 to 20 m2, 20 to 40 m2, 40 to 60 m2, or other allocations.
It is further proposed that the database also contain contamination information about of the partial surface area and/or a time specification for a floor processing activity performed last in the partial surface area and/or a time specification for a planned floor processing activity and/or an estimated performance timespan for performing a floor processing activity and/or information about the type of floor processing activity allocated to the partial surface area. As a consequence, the database contains data about a contamination level of a specific partial area, for example. For example, this contamination level can be a percentage indication of 0 to 100%, which can be divided into large or small ranges. In addition, the database can also contain the proposed time indications, which the computing device can consider while including a floor processing device in plans for an upcoming floor processing activity. In addition, the database also contains information about a type of floor processing activity allocated to a specific partial surface area. For example, both the type “dry cleaning” and the type “wet cleaning” are allocated to a hard floor, while only the option “dry cleaning” is available for a carpeted floor, possibly divided into “gentle cleaning” or “intensive cleaning”.
The proposed database can further contain one or several floor processing activities chronologically planned in advance for one or several floor processing devices and allocated to the partial surface areas. The planned floor processing activities entered into the database describe the result of the computing device, specifically information about the floor processing device or the floor processing devices which were allocated as optimal to a specific partial surface area for a specific floor processing activity. The planned floor processing activities can here have a chronological sequence for a specific partial surface area, which determines the floor processing activities by starting times or at least in relation to a chronological order of priority.
It is further proposed that the computing device be set up to allocate the floor processing device to a partial surface area based upon a ratio determined according to mathematical methods, which indicates a suitability of the floor processing device for performing the floor processing activity in the partial surface area. The computing device uses a sorting algorithm, which determines a processing of a specific partial surface area of the environment by one or more floor processing devices. An order of processing priority can here also be determined for several floor processing devices. The algorithm is based upon defined rules for selecting suitable floor processing devices, whose rules among other things can determine, for example, that a floor processing device can only be used for a defined floor processing activity on a defined partial surface area if a path exists along which the floor processing device can move toward it. For example, such a traversable path does not exist if the partial surface area and the floor processing device are located on different floors of the building, and the floor processing device is unable to climb up the stairs and/or take an elevator, in addition to which no other system installations, for example drones, hoists, or the like, exist that can convey the floor processing device. In addition, the floor processing devices are sorted by the type of floor processing activity they can perform, wherein no floor processing devices are considered for a specific floor processing activity to be performed that cannot satisfy a specification relative to the type of floor processing. In addition, the floor processing devices are sorted based on their current distance from the partial surface area to be processed, and possibly also on the size of the partial surface area to be processed, the processing intensity it requires, which in particular can depend on a contamination level, for example. In addition, the floor processing devices can also be sorted by other parameters, for example a current charge status of an accumulator or the like. In summation, the floor processing devices are thus sorted depending on the properties of the floor processing devices, and also on the external circumstances in the environment. As a result, the computing device then determines a ratio that indicates a suitability of the specific floor processing device for a specific floor processing activity in a specific partial surface area. It can here be provided that a lowest possible ratio defines a better suitability than a comparatively higher ratio.
In addition, the invention proposes a method for operating a system, which is configured as explained above. The features and advantages described above in relation to the system here apply accordingly. In order to avoid repetition, reference is here made to the statements about the described system in relation to the method according to the invention.
Other objects and features of the invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.
In the drawings,
In addition, the floor processing devices 1 to 5 are each equipped with a navigation and self-localization system 29. The navigation and self-localization system 29 has a detection unit, for example a laser distance measuring device, which can measure distances to objects in the environment. For example, the detection unit has a laser diode, whose emitted light beam is guided out of a housing of the floor processing device 1 to 5, and can be rotated around an axis of rotation that is situated perpendicular in the depicted orientation of the floor processing device. In particular, this allows an all-round distance measurement around the floor processing device 1 to 5. The detection unit can be used to measure the environment in a preferably horizontal plane, i.e., in a plane parallel to the surface to be processed. As a result, the floor processing device 1 to 5 can travel in the environment while avoiding collisions with obstacles. The environmental data recorded by means of the detection unit are used for generating an area map 8 only exemplarily shown on
The floor processing devices 1 to 5 are here communicatively connected via a wireless communications link, preferably WLAN, with a central computing device 6, for example which is here located in a so-called cloud. The computing device 6 has allocated to it a database 7, which contains a Table 20 to be described in even more detail later with reference to
Based on the floor processing commands 17 of the user, the computing device 6 formulates a plan for the floor processing activities, which are logged in the database 7, specifically Table 20. While moving, the floor processing devices 1 to 5 access a shared area map 8 (see
According to the exemplary embodiment shown only as an example, the invention functions in such a way that the user transmits his or her floor processing commands 17 to the computing device 6 by means of the terminal 25, as explained. The computing device 6 thereupon generates Table 20 from the shared area map 8 of the floor processing devices 1 to 5, along with the indications contained in the floor processing commands 17. In the exemplary embodiment shown, the user specifies concrete rooms with the floor processing commands 17. However, it can alternatively also be provided that the user voice more generally formulated floor processing commands, for example “clean all hard floors”, so that the computing device 6 would determine all partial surface areas 9 to 14 that have a hard floor. To this end, the computing device 6 filters both a partial area designation 15 and a floor type designation 16 out of the floor processing command 17. The same holds true for the type of floor processing activity, here specifically contained in the requests “clean”, “vacuum”, and “mop”.
Table 20 generated by the computing device 6 is used to coordinate floor processing activities of the plurality of floor processing devices 1 to 5 present in the system. The allocation of a specific floor processing device 1 to 5 to a floor processing activity in a specific partial area 9 to 14 takes place via a sorting algorithm executed by the computing device 6, which considers various device parameters of the floor processing devices 1 to 5, along with their current positions in relation to the partial surface area 9 to 14 to be processed. In particular, it makes sense to examine the current position of the floor processing devices 1 to 5 in relation to the location of the partial surface areas 9 to 14 to be processed. For example, the floor processing devices 1 to 5 are here not designed to move from one floor 18 to the other floor 19 and vice versa. Therefore, exclusively the floor processing devices 1, 2 and 4 located on floor 18 can be used for floor processing activities that relate to a partial surface area 9, 10, 11, 13 on floor 18. The same holds true for the floor processing devices 3 and 5, which are located on the other floor 19 with the partial surface areas 12, 14. In the following, the sorting algorithm which initiates the entries on Table 20 relating to the selection of floor processing devices 1 to 5 will be described in more detail. The shared area map 8 comprises the essential foundation for the information contained on Table 20. For example, it discloses the floor type designation 16 and surface information 30 along with the contamination information 21. For example, the user here also enters the respective partial area designation 15 and the floor 18, 19 in the area map 8 or directly on Table 20.
In the exemplary embodiment shown, the floor processing command 17 contains information about which partial surface area 9 to 14 is to be cleaned, possibly along with when the cleaning is to be started and/or ended, and what kind of cleaning is to be performed. If one item of information is not on hand, it can be actively requested from the user, for example by way of a request displayed on the terminal 25. Given an inadequately indicated specification, a standard cleaning can alternatively be performed, for which parameters are defined. For example, if the type of cleaning is not indicated, the standard cleaning “dry cleaning” defined for it takes place. The performance time is entered in the field “time specification” 24 and the type of cleaning “dry” and/or “wet” is entered in the field “activity/type” from the floor processing command 17 of the user, if available. To this end, it is here determined that carpets and carpeted floors are only dry cleaned, and hard floors as well as wood floors are both dry and wet cleaned. The corresponding floor processing command 17 is allocated twice to the partial surface area 10 “living room”, specifically once for the floor type 16 “wood floor” and once for the floor type 16 “carpet”. Since both floor processing devices 1, 2 that can perform a dry cleaning are present on the accompanying floor 18, along with a floor processing device 4 that can perform a mopping operation, both a “dry cleaning” and a “wet cleaning” are planned for the floor type 16.
A time specification 24 was entered in the field “pending requests” for cleaning the partial surface areas 12 “bathroom” and 14 “bedroom”. The cleaning of the partial surface area 12 starts at the entered time (7:30 a.m.). Cleaning is performed by the floor processing device 5. The floor processing device 3 is used for cleaning the partial surface area 14 “bedroom”, and is located on the floor 19 “upper floor” along with the partial surface area 14. The feature relative to the partial surface area 14 is that the floor processing activity must have ended by a defined time, here specifically by 7 p.m. To this end, the computing device 6 determines the time at which the floor processing device 3 must begin the floor processing activity so as to meet the requirement. Since a duration of 30 minutes was here calculated as the anticipated performance timespan 23 for the floor processing activity by the floor processing device 3, 6:30 p.m. arises as the starting time for cleaning the bedroom (see
The sorting algorithm used by the computing device 6, which determines the order of priority of the floor processing devices 1 to 5 in the last three columns of Table 20, is based on defined rules, which are here processed in the sequence described below, for example.
For example, a first rule stipulates that a specific floor processing devices 1 to 5 be planned for a floor processing activity in a partial surface area 9 to 14 if a path of movement exists between the current position of the floor processing device 1 to 5 and the position of the partial surface area 9 to 14 to be cleaned that can be successfully taken by the floor processing device 1 to 5. A path of movement does not exist in this sense if the partial surface area 9 to 14 and the floor processing device 1 to 5 are not located on the same floor 18, 19, and the floor processing device 1 to 5 is thus unable to move toward the partial surface area 9 to 14. In addition, for example, a path of movement also does not exist if the floor processing device 1 to 5 is a mopping robot that cannot traverse a carpet located in the path of movement.
A second rule of the sorting algorithm can stipulate that all those floor processing devices 1 to 5 be precluded from performing a specific floor processing activity that do not satisfy the specification of the activity type, for example specifically “dry cleaning” or “wet cleaning”. As a consequence, a mopping robot cannot be used for a dry cleaning, and a vacuum cleaner cannot be used for a wet cleaning.
For example, another rule here provides that the floor processing devices 1 to 5 planned in the three right columns of Table 20 be sorted with respect to an order of priority according to a distance to the partial surface area 9 to 14 to be processed, the size of the partial surface area 9 to 14, the contamination of the partial surface area 9 to 14, and the charge status of an accumulator of the respective floor processing device 1 to 5.
In summation, the order of priority that denotes the suitability of a floor processing device 1 to 5 for a specific floor processing activity is established as a function of the device parameters of the floor processing devices 1 to 5 as well as the spatial conditions of the partial surface areas 9 to 14.
In particular, for example, a ratio “Ki” is calculated, which depends on the distance “Di” between the floor processing devices and the partial surface area 9 to 14 to be processed, as well as on a surface variable “Ci” and a contamination variable “Pi”. The ratio is here calculated according to the formula
Ki=Di/max(Di,i)+Ci/max(Ci,i)+Pi/max(Pi,i).
The variable “Ci” is here derived as exp(Ad1−A). The variable “Pi” is derived as exp(A*S−V1*F1). “Ci” describes the correlation between the cleaning surface “A” and an estimated surface “Adi”, which the robot can clean with a current accumulator charge. As a result of this variable, preference is given to floor processing devices 1 to 5 for cleaning a partial surface area 9 to 14 that are able to completely process the partial surface area 9 to 14 with their current accumulator charge. The variable “Pi” describes the correlation between the contamination “S” of the partial surface area 9 to 14 (recorded on Table 20 as contamination information 21) and the fill level “V” of the dirt container of the floor processing device 1 to 5. F describes a parameter that indicates the maximum amount of dirt the dirt container can hold. The exponential function “exp” used here is only an exemplary function, which can be used for sorting the floor processing devices 1 to 5. As a result, the floor processing device 1 to 5 with the smallest ratio “Ki” can best perform the floor processing activity.
Based on the queue on Table 20 defined by the order of priority for the floor processing devices 1 to 5 (the three last columns on Table 20 listed on the right), the floor processing devices 1 to 5 are controlled for planned floor processing operations. As explained above, the floor processing devices 1 to 5 are allocated to specific floor processing activities in the partial surface areas 9 to 14 based on their suitability.
The floor processing devices 1 to 5 are preferably sorted in the order of priority/queue in such a way that a partial surface area 9 to 14 cannot be processed if the column “1.” contains no floor processing device 1 to 5 for this partial surface area 9 to 14. In concrete terms, this then means that all available floor processing devices 1 to 5 are already busy with other floor processing activities. If a partial surface area 9 to 14 is to be both dry and wet cleaned, a dry cleaning by one of the floor processing devices 1 to 3 is first planned, and only after that a wet cleaning by one of the floor processing devices 4 and 5. The floor processing devices 1 to 5 are here preferably always first allocated to processing hard floors or wood floors, and only thereafter to cleaning carpets or carpeted floors. In a case where both a dry cleaning and a wet cleaning are to be performed, this rule makes it possible to ensure that floor processing devices 1 to 5 are not blocked by the cleaning of carpets or carpeted floors, since this in particular might in turn only allow the delayed use of the wet cleaning devices planned for the hard floors or wood floors. In addition, it is preferably proposed that Table 20 be processed in terms of time from the top down according to the sequence of listed partial surface areas 9 to 14. As a consequence, a preferred processing of a specific partial area 9 to 14 can be achieved by placing the corresponding partial surface area 9 to 14 in the top line on Table 20.
In the event that a floor processing operation must be started or ended at a defined time, as shown in particular on
In the event a desired floor processing activity cannot be performed by a floor processing device 1 to 5, the partial surface area 9 to 14 can be divided into sub-partial areas. Additional lines then arise on Table 20 for the sub-partial area of the partial surface areas 9 to 14. If the user command cannot be executed at all, the user can alternatively be given a suggestion, for example, as to how and in what way the respective partial surface area 9 to 14 can still be processed.
Even though not illustrated here, the user can of course still transmit many other floor processing commands 17 to the computing device 6 of the system. Additional examples include commands like “clean all carpets on the ground floor”, “clean all hard floors”, “clean all rooms that are very dirty”, and others.
Although only a few embodiments of the present invention have been shown and described, it is to be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 131 583.2 | Nov 2019 | DE | national |
