DE102021108567A1 - System, comprising an induction hob and a kitchen utensil, method for operating the system, computer program product and computer-readable data carrier - Google Patents

Abstract

The invention relates to a system (2), comprising a component of the system (2) designed as an induction hob (4) and a kitchen utensil (6) for placing on the induction hob (4), the kitchen utensil (6) being designed in such a way that the kitchen utensil (6) can be heated by means of an induction coil of the induction hob (4) when the kitchen utensil (6) is placed on the induction hob (4), and wherein the system (2) has at least one memory (8) for storing data on at least one induction hob parameter induction hob (4) and/or kitchen utensil parameters of the kitchen utensil (6), the system (2) being designed in such a way that the data relating to the at least one induction hob parameter and/or kitchen utensil parameter during operation of the induction hob (4) and/or the kitchen utensil (6) are automatically stored in the memory (8), characterized in that the at least one memory (8) as a manipulation ns protected memory is formed.

Description

The invention relates to a system comprising an induction hob and a kitchen utensil of the type mentioned in the preamble of patent claim 1, a method for operating the system, a computer program product and a computer-readable data carrier.

Such systems, methods, computer program products and computer-readable data carriers are already known from the prior art in a large number of embodiments. The known systems comprise a component of the system designed as an induction hob and a component of the system designed as a kitchen utensil to be placed on the induction hob, the kitchen utensil being designed in such a way that the kitchen utensil can be heated by means of an induction coil of the induction hob when the kitchen utensil is placed on the induction hob, and the system at least has a memory for storing data on at least one induction hob parameter of the induction hob and/or kitchen utensil parameter of the kitchen utensil, the system being designed in such a way that the data on the at least one induction hob parameter and/or kitchen utensil parameter is automatically stored during operation of the induction hob and/or the kitchen utensil can be stored in memory.

As is known, the food to be cooked is heated indirectly in induction hobs, with a heating device of the hob heating a metal plate in a kitchen utensil positioned on the hob and the metal plate giving off the heat to the food to be cooked.

For example, see the DE 10 2017 114 943 A1 , from which a cookware for use with an induction hob is known. The cookware has a body with a base, with a wall area and with a transition area between the base and the wall area, the base being designed to be placed on a hotplate of the induction hob and to be inductively heated by an induction coil of the hotplate, and wherein the Bottom has at least a first layer with a Curie temperature. The wall area and/or the transition area are/is made of a material that has a lower magnetic permeability than the material of the first layer of the base. In one embodiment, this cookware has a total of three layers, with the aforementioned first layer on the dem The side of the first layer facing away from the induction hob is a second layer designed as a heat-conducting layer, and this second layer is followed by a third layer designed as a non-magnetizable layer.

Furthermore, from the DE 10 2018 124 319 A1 discloses a method and a device for operating a hob with cookware. The method known therefrom comprises a step of reading in and a step of providing. In the step of reading in, a temperature signal, which represents a current set-up temperature of a cookware, is read in. In the providing step, a control signal that is designed to control a function of the hob is provided. The control signal is provided using a comparison of the installation temperature represented by the temperature signal with a reference value. This is intended to limit a temperature on a base of the cooking utensil if a cooking surface of the hob is not formed from a material with high thermal shock resistance, such as glass ceramic.

Proceeding from the known prior art, the invention thus faces the problem of improving a system comprising an induction hob and a kitchen utensil, a method for operating the system, a computer program product and a computer-readable data carrier.

According to the invention, this problem is solved by a system having the features of patent claim 1, which is characterized in that the at least one memory is designed as a manipulation-protected memory. Furthermore, this problem is solved by a method having the features of patent claim 10, a computer program product having the features of patent claim 14 and a computer-readable data carrier having the features of patent claim 15. Advantageous refinements and developments of the invention result from the following dependent claims.

The advantage that can be achieved with the invention is, in particular, that a system comprising an induction hob and a kitchen utensil, a method for operating the system, a computer program product and a computer-readable data carrier are improved. Due to the inventive design of the system, the method of the computer program product and the computer-readable data carrier, the data stored in the memory for at least one induction hob parameter of the induction hob and/or kitchen utensil parameters of the kitchen utensil are stored in a tamper-proof manner. Accordingly, changing the data stored in the memory is either at least partially not possible or only possible under previously defined conditions that restrict access to the memory and the data stored therein. This is advantageous, for example, if the question of responsibility has to be clarified in a court-proof manner in the event of a later occurring security incident or damage incident in the operation of the system. For example, so-called fully integrated induction hobs are sold, which are installed by a kitchen builder under a worktop supplied by a worktop supplier. In the event of an error, for example with a discolored or broken worktop, it must then be clarified whether the built-in induction hob and/or the kitchen utensil used has exceeded a specified maximum permissible temperature or a specified maximum permissible temperature increase per time in the area of the worktop, or whether it was an error in the worktop or in the choice of worktop. Depending on which component of the system is at fault, either the manufacturer of the induction hob, the kitchen utensil or the worktop or the kitchen planner would be responsible for the security incident or the damage incident. According to the above example, the temperature would have to be measured on the underside of the kitchen utensil and the essential information needed to clarify who was responsible for the damage would have to be stored. In order to prevent the aforementioned error from the outset, the control of the induction hob must be adjusted in such a way that defined maximum permissible temperatures or maximum permissible temperature changes in the area of the worktop are not exceeded.

In principle, the system according to the invention can be freely selected within wide suitable limits in terms of type, mode of operation, material, dimensioning, arrangement and number of components. For example, the system can be suitably designed for the household sector, ie the private sector, or for professional use, ie the commercial sector.

An advantageous development of the system according to the invention provides that the system has an access checking unit which is connected to the memory in a signal-transmitting and/or data-transmitting manner and is designed in such a way that the access checking unit can be used to check access authorization for an attempted access to the memory and, in the event of an unauthorized access attempt, access to the memory is automatically prevented and, in the event of an authorized access attempt, access to the memory is automatically enabled, the access checking unit being designed as a read protection and/or a write protection. As a result, access to the memory and the data stored therein for the at least one induction hob parameter and/or kitchen utensil parameter and thus protection against manipulation of the memory can be implemented in an effective and at the same time user-friendly manner.

Accordingly, an advantageous development of the method according to claim 9 provides that the access checking unit checks an access authorization of an attempted access to the memory and, in the case of an unauthorized access attempt, access to the memory is automatically prevented and in the case of an authorized access attempt, access to the memory is automatically prevented is made possible.

An advantageous further development of the aforementioned embodiment of the system according to the invention provides that the memory is designed in such a way that authorized access to the memory and/or an unauthorized attempt to access the memory cannot be overwritten and cannot be erased in the memory. In this way it is possible to seamlessly trace access attempts and actual accesses to the memory and thus to the data stored in the memory for the at least one induction hob parameter and/or kitchen utensil parameter.

Accordingly, an advantageous development of the method according to claim 10 provides that authorized access to the memory and/or an unauthorized attempt to access the memory is/is documented in the memory in a non-overwritable and non-erasable manner.

An advantageous development of the last two embodiments of the system according to the invention provides that the access verification unit is designed in such a way that the access verification unit includes at least one of the following security technologies: password protection, token protection, digital signature protection, biometric access protection. The security techniques mentioned above are security techniques that have been tried and tested in many areas of application. Furthermore, a possible user of the system, and thus of the induction hob and the kitchen utensil, is familiar with the handling of such safety techniques.

A particularly advantageous development of the system according to the invention provides that the memory contains at least one memory area for safety-related and/or damage-related data for the at least one induction hob parameter and/or kitchen utensil parameter of a possible Security and/or damage incident in the system, in which the aforementioned data are protected against resetting the memory to a delivery state and/or against modification and/or against overwriting and/or against deletion. As a result, a further barrier against unauthorized access is installed in the memory, so that the aforementioned particularly sensitive data is even better protected against manipulation than other data on the at least one induction hob parameter and/or kitchen utensil parameter. The data stored in this special memory area, namely the security and/or damage-related data, is data that is of crucial importance for later clarification of a security incident or damage incident that has occurred in the meantime, for the purpose of clarifying responsibilities. By means of the aforementioned data, which is determined before and during operation of the system leading to a security incident or damage incident and stored in the special memory area, for example depending on the above-mentioned temperature on the underside of the kitchen utensil facing the induction hob or an induction coil output of the induction hob, it can then be seen without a doubt whether the security incident or the damage incident is causally related to the induction hob and/or the kitchen utensil.

One aspect is that an improvement in thermal insulation can be achieved without reducing the efficiency of the induction coil and generator by providing a secondary coil in the lower part of the bottom of the kitchen utensil and a resistance heater in the upper part of the bottom of the kitchen utensil.

A further advantageous development of the system according to the invention provides that the system additionally comprises a component which is connected to the induction hob and/or the kitchen utensil in a signal-transmitting and/or data-transmitting manner and is designed as a third-party device, with the at least one memory being physically at least partially arranged on the third-party device, preferred that the third-party device is designed as a server. In this way it is possible, for example, to store data on the at least one induction hob parameter and/or kitchen utensil parameter in a much larger number in a manipulation-protected manner than is possible with memories integrated in the induction hob and in the kitchen utensil, the storage capacity of which is correspondingly very limited. For example, the data could be recorded in a tamper-proof manner over the entire operating time of the system, i.e. the lifetime of the induction hob and the kitchen utensil. Furthermore, this development has the further advantage that the aforementioned data can be stored in a tamper-proof manner, independently of the induction hob or kitchen utensil that may have been damaged or destroyed by a possible security incident or damage incident.

Another advantageous development of the system according to the invention provides that the at least one memory is designed as a plurality of memories, the individual memories of the plurality of memories being physically distributed over at least two of the components of the system. This creates redundancy in the manipulation-protected storage of the data relating to the at least one induction hob parameter and/or kitchen utensil parameter during operation of the induction hob and/or the kitchen utensil. The risk of any data loss is reduced accordingly.

A further advantageous development of the system according to the invention provides that the memory is designed in such a way that the data can be read from and/or written to the memory using the induction hob and/or the kitchen utensil and/or the third-party device. In this way, the handling and thus the user-friendliness of the memory is improved, despite the protection against manipulation according to the invention. Authorized access to the data stored in a tamper-proof manner in the memory is thus guaranteed, depending on the requirements of the individual case.

Accordingly, an advantageous development of the method according to one of claims 9 to 11 provides that the data is read out from the memory and/or written using the induction hob and/or the kitchen utensil and/or the third-party device.

• 1 ein Ausführungsbeispiel des erfindungsgemäßen Systems zur Durchführung der erfindungsgemäßen Verfahren in einer geschnittenen Seitenansicht.

An embodiment of the invention is shown purely schematically in the drawing and is described in more detail below. It shows the only figure:

• 1 an embodiment of the system according to the invention for carrying out the method according to the invention in a sectional side view.

In the 1 an exemplary embodiment of the system according to the invention for carrying out the method according to the invention is shown purely as an example.

The system 2 comprises a component of the system 2 designed as an induction hob 4 and a component of the system 2 designed as a kitchen utensil 6 for placing on the induction hob 4, with the kitchen utensil 6 being designed in such a way that the kitchen utensil 6 can be moved by means of an induction coil (not shown) when the kitchen utensil 6 is placed on the induction hob 4 of the induction hob 4 can be heated. The system 2 also has a memory 8 for storing data on at least one induction hob parameter of the induction hob 4 and/or kitchen utensil parameters of the kitchen utensil 6, with the system 2 being designed in such a way that the data on the at least one induction hob parameter and/or kitchen utensil parameter during a Operation of the induction hob 4 and/or the kitchen utensil 6 can be automatically stored in the memory 8, the memory 8 being designed according to the invention as a tamper-proof memory.

The kitchen utensil 6 is designed here as a cooking pot and comprises an inner shell 9 with an inner base 10 and an outer shell 12 spaced from the inner shell 9 by a gap 11 and having an outer base 14. An inductive heating device 16 is located between the inner base 10 and the outer base 14 Distance to the outer shell 12 arranged in a thermally conductive manner on the inner floor 10, wherein the inductive heating device 16 in one in the 1 illustrated set-up position of the kitchen utensil 6 on the induction hob 4 can be inductively coupled directly and/or indirectly to the induction coil of the induction hob 4, not shown. On the inner shell 6, two handles 18 are also attached for handling the kitchen utensil 6, wherein in the plane of the image 1 Electronics 20 for controlling or regulating the kitchen utensil 6 and/or for communication with the hob and/or other devices are integrated into the handle 18 shown on the left. The electronics 20 are wired or wirelessly connected to the memory 8 in a manner known to those skilled in the art. The kitchen utensil 6 is designed in such a way that the inner shell 9 and the outer shell 12 each include at least one electrical component. The at least one electrical component of the inner shell 9 comprises the following electrical components: The electronics 20 integrated in one of the handles 18 for controlling or regulating the kitchen utensil 6 and/or for communicating with the hob and/or other devices, a total of three designed as temperature sensors 22 and sensors distributed over the height of an inner wall 24 of the inner shell 9 and a sensor designed as a temperature sensor 22 and arranged on the inner base 10 for detecting one kitchen utensil parameter in each case, namely a temperature of the inner shell 9 and the kitchen utensil 6, an inductively operated heating device 16 for heating an item to be cooked, not shown, located in the inner shell 9 . As is known, the food to be cooked is heated indirectly in the case of induction cooktops, with the heating device 16 heating a metal plate arranged in the kitchen utensil and this giving off the heat to the food to be cooked.

Furthermore, in other embodiments of the invention, the inner shell can alternatively or additionally have further electrical components, for example at least one sensor for detecting another kitchen utensil parameter of the kitchen utensil and/or coils or antennas for signal transmission between the inner shell and the outer shell and/or between the kitchen utensil and the induction hob and/or between the kitchen utensil and a third appliance and/or a resistance-based heating device and/or an induction coil suitably designed for so-called energy harvesting for supplying energy to the electronics of the kitchen utensil and/or a resistance-based heating device. The at least one electrical component of the outer shell 12 comprises a sensor embodied as a temperature sensor 26 and arranged on the outer base 14 for detecting a kitchen utensil parameter of the kitchen utensil 6 embodied as the temperature of the outer shell 12, namely the outer base 14. Analogously to the inner shell, the outer shell can also be other embodiments of the invention, alternatively or additionally, other electrical components, such as electronics for controlling or regulating the kitchen utensil, at least one sensor for detecting another kitchen utensil parameter of the kitchen utensil, an induction coil for heating an item to be cooked in the inner shell, an induction coil for supplying energy to the aforementioned Electronics of the kitchen utensil, and coils or antennas for signal transmission between the inner shell and the outer shell and / or between the kitchen utensil and the induction hob and / or between the kitchen utensil and a third device and/or an induction coil suitably designed for so-called energy harvesting for supplying energy to the electronics of the kitchen utensil and/or a resistance-based heating device.

In the present exemplary embodiment, the system 2 has an access check unit (not shown), which is connected to the memory 8 in a signal and/or data-transmitting manner and is designed in such a way that the access check unit can be used to check an access authorization for an attempted access to the memory 8 and in the event of an unauthorized access attempt access to the memory 8 is automatically prevented and, in the event of a legitimate access attempt, access to the memory 8 is automatically enabled, the access checking unit being designed as a read protection and/or a write protection. The memory 8 is also designed in such a way that authorized access to the memory 8 and/or an unauthorized attempt to access the memory 8 in the memory 8 cannot be overwritten and cannot be erased. In addition, the access verification unit is designed in such a way that the access verification unit includes at least one of the following security technologies: password protection, token protection, digital signature protection, biometric access protection.

The memory 8 has a memory area, not shown, for safety- and/or damage-related data on the at least one induction hob parameter and/or kitchen utensil parameter of a possible safety and/or damage incident in the system 2, in which the aforementioned data was saved before the memory 8 to a delivery state and/or are protected from being changed and/or from being overwritten and/or from being deleted. Furthermore, the memory 8 is designed in such a way that the data for the at least one induction hob parameter and/or kitchen utensil parameter can be read from and/or written to the memory 8 by means of the induction hob 4 and/or the kitchen utensil 6 . For this purpose, the induction hob 4 and/or the kitchen utensil 6 and/or a suitable further device connected to the induction hob and/or the kitchen utensil in a signal-transmitting and/or data-transmitting manner has a suitable input unit and output unit (not shown), with the respective input unit and output unit being, for example, a combined input and output unit can be formed.

The additional device can be used, for example, to read out the memory 8 via a device belonging to the customer service technician via WLAN/BT or an optical interface.

In other embodiments of the system according to the invention, the system can additionally comprise a component which is connected to the induction hob and/or the kitchen utensil in a signal-transmitting and/or data-transmitting manner and is designed as a third-party device, with the at least one memory being physically at least partially arranged on the third-party device, preferably in that the Third device is designed as a server. Furthermore, the at least one memory can be embodied as a plurality of memories, the individual memories of the plurality of memories being physically distributed over at least two of the components of the system.

In the following, the functioning of the system according to the invention and the method according to the invention according to the present embodiment as well as various alternative or additional measures according to the invention are explained using the 1 explained as an example.

In the present exemplary embodiment, the data on the at least one induction hob parameter and/or kitchen utensil parameter is automatically stored in the memory 8 during operation of the induction hob 4 and/or the kitchen utensil 6, depending on the storage capacity of the memory 8, in such a way that safety-related and/or damage-related data of a possible security and/or damage incident in the system 2 in the memory 8 over a longer predetermined period of time in the aforesaid memory 8 in comparison to data not relevant to security and/or damage. The aforementioned period of time can be, for example, a presumed total operating time of the induction hob 4 and/or the kitchen utensil 6, ie their respective presumed service life. Access authorization of an attempted access to memory 8 is checked by means of the access checking unit and, in the event of an unauthorized access attempt, access to memory 8 is automatically prevented and in the event of an authorized access attempt, access to memory 8 is automatically enabled. In the present exemplary embodiment, both an authorized access to the memory 8 and an unauthorized access attempt to the memory 8 are documented in the memory 8 in a non-overwritable and non-erasable manner. The data are read and/or written from the memory 8 by means of the induction hob 4 and/or the kitchen utensil 6 in the manner explained above.

For the reasons already mentioned in the introductory part of the description, it is interesting that in particular safety and/or damage-related data on the at least one induction hob parameter and/or kitchen utensil parameter, such as a temperature exceeding a maximum permissible temperature on an underside of the kitchen utensil 2 facing the induction hob 4, an underlying maximum permissible temperature or sudden temperature fluctuations on the aforementioned underside, are longer traceable and cannot be manipulated.

The data storage measures described above can be used to advantage for this purpose. By means of the aforementioned measures, in particular the sensitive data mentioned, i.e. the security-relevant and/or damage-related vanten data of a possible security and / or damage incident in the system 2, for example protected against resetting to the delivery state. The above-mentioned special memory area of memory 8 is protected or specially protected compared to the rest of memory 8, so that this special memory area of memory 8 is not overwritten even when memory 8 is reset to the delivery state. This also provides protected documentation of changes to limit values, for example the above-mentioned maximum permissible temperature on the underside of the kitchen utensil 6, or the data from which the limit values are automatically calculated, for example the material of a worktop, not shown, on which the induction hob 4 is arranged as a so-called fully integrated induction hob, the thickness of the worktop, a distance of a cooking zone of the induction hob 4 from an edge of the worktop, cutouts, engravings or other weakening of the worktop, realizable. The documentation can take place, for example, in the induction hob and/or online, ie on a system server, with special protection against deletion and/or overwriting. For example, it could be documented who made which changes and when. Restricting the setting of corresponding induction hob parameters and/or kitchen utensil parameters to limited groups of people, for example customer service, authorized dealers or the like, by having the aforementioned access control unit available to restrict access, serves to protect this data from being manipulated. For example, a release by logging into a cloud service would generate a corresponding token that puts the induction hob into a programming-ready mode. Furthermore, the protection against manipulation by a digital signature of the data or of selected significant data, such as exceeding the above-mentioned maximum permissible temperature on the underside of the kitchen utensil at time x for a duration y with a maximum temperature z1 or the completion of a cooking process conceivable without exceeding the above-mentioned maximum permissible temperature on the underside of the kitchen utensil with a maximum temperature of z2. Storage of certain data, in particular the aforementioned sensitive data, also during operation, on a memory designed as a non-volatile memory, also protects against manipulation, so that no data from volatile memory is lost in the event of an error, as well as a plausibility check of the data, for example using temperature data that be measured using another temperature sensor under the worktop.

The temperature sensor 26 measures the temperature on the above-mentioned underside of the kitchen utensil 6, namely on the outer base 14. This measured temperature value can be used to prevent a defined temperature, namely a Limit temperature at the bottom of the kitchen utensil 6 is exceeded.

The limit temperature mentioned above can be fixed or specified, for example, when the system 2 is installed or put into operation for the first time. The system 2 essentially consists of the induction hob 4 hidden under the worktop, tabletop or the like, which is not shown, the aforementioned worktop or the like and one or more kitchen utensils, for example the aforementioned kitchen utensil 6.

If the aforementioned limit temperature is adjusted, this can be done, for example, using worktop material classes such as glass ceramic, ceramic, natural stone, real wood or the like. This can be done relatively easily by selecting from a list.

Alternatively, the aforementioned limit temperature and other control parameters can be adjusted more precisely to the respective installation situation. In addition to the worktop material, for example, a worktop thickness, a size of the areas of the induction hob 4 that are possible for the operation of the kitchen utensil 6, a position of the areas of the induction hob 4 that can be used for the kitchen utensil 6 relative to weakening of the worktop or edges of the worktop or a weakening or strengthening of the worktop are taken into account by measures for fastening the induction hob 4.

The information on the properties of the worktop used can be stored on the worktop, for example via a QR code or barcode. For example, plans or drawings from the kitchen planning or photos of the worktop prepared for installation can be included in order to estimate the stress on the worktop. From the aforementioned documents, for example, the proximity of the above-mentioned cooking zone of the induction hob 4 to edges of the worktop, weakened positions of the worktop due to larger cut-outs, holes in the worktop, such as sink openings, supports of the worktop or increased stresses in the worktop due to large, unsupported, free-floating areas of the worktop, removable.

The calculations can be done on site or in advance. If the calculation is carried out in advance, for example automatically as part of the kitchen planning, the individualized settings can be stored in a cloud (not shown), i.e. a server, by means of the system so that they can be called up. When the system is commissioned, the system can be code linked to these presets and automatically installed and set up. If necessary, further kitchen appliances of the system (not shown) can also be automatically put into operation with other settings made beforehand. The aforementioned settings can be, for example, the following settings: a dialogue language with the system that results from a consultation, or a water hardness that results from an installation location, for example the delivery address. Additional information about other existing devices in the system with potential for networking within the system can be found in the order list, for example.

The temperature measured by the temperature sensor 26 can be evaluated in the kitchen utensil 6 designed as a saucepan or in the induction hob 4 or externally, for example in the cloud mentioned above.

If the evaluation is carried out in the kitchen utensil 6 , the limit value mentioned above or the limit values for a plurality of possible worktops or the like must be stored in the kitchen utensil 6 . To ensure that this cannot be changed arbitrarily, a change requires special authorization. This can be, for example, the above-mentioned digital signature of the set limit value, which is evaluated by the electronics 20 of the kitchen utensil 6, namely the access checking unit, in conjunction with the memory 8.

The measured value of the temperature sensor 26 on the underside of the kitchen utensil 6, namely on its outer bottom 14, and any variables derived therefrom, such as the derivation of the measured value with reference to time or the difference to the measured values of the temperature sensors 22, are compared with the specified limit values compared. If this is exceeded, it is stored in a tamper-proof manner in the memory 8 and, if necessary, reported to the induction hob 4 or other connected devices, for example the cloud mentioned above. The forwarding of the measured values to the induction hob 4, for example, is optional and can, if necessary, take place less frequently than the evaluation of the data within the kitchen utensil in order to save a transmission bandwidth. In this case, the induction hob 4 can wait for the signal that the limit has been exceeded and respond to the receipt of this signal by reducing the power of the induction coil of the induction hob 4 .

If the measured values of the temperature sensor 26 on the outer floor 14 are transmitted to the induction hob 4, they can be evaluated there. For example, when the temperature detected by the temperature sensor 26 approaches the limit temperature mentioned above, the power of the aforementioned induction coil can be reduced and the induction coil can be switched off when the limit temperature is exceeded.

Since additional information is generally available in the induction hob 4 compared to the kitchen utensil 6 and more powerful processors are usually present, further evaluations based on the temperature on the outer floor 14 can be carried out here as an alternative or in addition.

One example is the creation of a parameter set that is individually adapted for the system 2 for the evaluation of the temperature sensor 26 and/or the additional temperature sensor arranged under the worktop of the induction hob 4 designed as a fully integrated induction hob Be arranged induction hob. This additional temperature sensor is necessary because, for example, after installing a fully integrated induction hob under a worktop without manual configuration, it is initially not clear how thick the worktop is, what conductivity or specific heat capacity it has and how good the additional temperature sensor is from below against the worktop. Therefore, from the measured value of this additional temperature sensor, the temperature of the kitchen utensil 6 placed on the induction hob 4 on the worktop, namely on the outer base 14 of the kitchen utensil 6, cannot be readily inferred. In order to be able to draw this conclusion within certain limits, a model of heat conduction adapted to this system 2 must be set up. The data required for this can be obtained if the temperature on the underside of the kitchen utensil 6 is known during cooking and roasting processes with the kitchen utensil 6 by measuring the temperature on the outer base 14 using the temperature sensor 26 . In particular, the course of this temperature can be compared with the course of the temperature under the worktop in order to determine the thermal properties of the worktop and the close thermal connection of the additional temperature sensor under the worktop. This can be used for a model with which classic kitchen utensils that are not or poorly insulated can be better monitored without their own temperature sensors and thus, possibly with a limitation to lower outputs and low temperatures, can be approved for operation on the induction hob 4 of the system 2 be able.

In the case of an external evaluation, for example in a cloud, ie a server of the system, all evaluations that can also be carried out in the induction hob 4 can be carried out if the corresponding measurement data are available. Additional background information, such as a cross-device recipe used specifically during system operation, can also be included. If, for example, the underside of the kitchen utensil repeatedly exceeds the temperature for a specific recipe, this information can provide valuable information for the further development of the system and can be included accordingly in future control or regulation of the system, for example the induction hob.

The maximum permissible temperatures or the exceeding of specified maximum permissible temperatures and parameters derived therefrom can be stored in the kitchen utensil 2 and/or in the induction hob 4 and/or in the aforementioned cloud. Depending on the available storage capacities, the data can be stored to different extents at the different storage locations, ie in different memories of the at least one memory of the system. The following describes an example of how data storage can typically be handled in the various components of the system. Depending on the given technical possibilities, this can of course be deviated from.

In the kitchen utensil usually only one store with relatively little storage capacity is available. Therefore, the storage of temperature curves can be dispensed with here and, for example, only extreme values are stored. This can be, for example, the maximum temperature, the maximum temperature over a defined longer period of time, the maximum temperature increase or decrease, the maximum temperature difference between different temperature sensors of the kitchen utensil, the number and possibly duration of the defined maximum permissible temperatures being exceeded, or the like . The data can be provided with time stamps for better traceability. Optionally, the measured values can be provided with a kitchen utensil ID and/or digitally signed in the electronics of the kitchen utensil. Data signing can be restricted to critical data only to reduce processor performance.

The same data can be stored in the induction hob as in the kitchen utensil. This has the advantage that, for example, if the induction hob or, in the case of the induction hob designed as a fully integrated induction hob, a worktop is damaged, it is also possible to trace the circumstances under which the damage occurred if the kitchen utensil is no longer available or no longer available is readable. Due to the usually higher storage capacity in comparison to the kitchen utensil in a memory integrated in an induction hob, further data can be stored here. For example, all temperature excesses with an exact temperature profile of all temperature sensors of the kitchen utensil and not just a maximum temperature and maximum temperature duration. Furthermore, additional data can be stored that is not available in the kitchen utensil, such as a target and/or actual performance of the induction coil at the time the maximum permissible temperature on the underside of the kitchen utensil was exceeded, the measured values, if applicable, in the induction hob under the worktop existing temperature sensors or parameters of a generator of the induction coil of the induction hob, such as the inductance.

Significantly more storage capacity and computing power is available in the cloud, i.e. in the server of the system, than is the case in the induction hob and the kitchen utensil, i.e. the components of the system on site. In addition to the data stored on the induction hob and/or kitchen utensil, for example, temperature sensor data that is not directly related to possible malfunctions can also be stored and evaluated here, taking into account the legal requirements and user wishes. Furthermore, data available in the cloud that are not available in the kitchen utensil and/or the induction hob can be added. For example, this can be the recipe being executed by a cooking assistance program at the time the maximum permissible temperature on the underside of the kitchen utensil was exceeded.

The storage strategies described above for exceeding the temperature can also be applied to other data on the kitchen utensil and/or the induction hob and/or the cloud. If data is to be read from the kitchen utensil, this can be done via the induction hob connected to it or via a direct connection, for example to a third-party device designed as a smartphone.

Since the memory, for example in a kitchen utensil, will eventually be full, provision can be made for older data to be overwritten by new data. If the memory contains critical data, for example if the aforementioned temperature limit has been significantly exceeded, i.e. the aforementioned safety and/or damage-related data for the at least one induction hob parameter and/or kitchen utensil parameter and less critical data, for example a non-critical temperature profile over a longer period of time are, protection of the critical data, ie the safety and / or damage-related data on the at least one induction hob parameter and / or kitchen utensil parameters, against overwriting can be provided, while less critical data is overwritten by newer data on a rolling basis.

In addition to protection against automatic overwriting, protection of the critical data against unintentional or unauthorized deletion and changes can also be provided. For example, it can be provided that only an internal process of the system may write this data on the basis of the temperature sensor measurements. If necessary, special authorization is required for deleting or editing the corresponding memory areas. This can be proven, for example, by a special password or a digital signature.

The temperature sensor for determining the temperature under the kitchen utensil can be located on the underside of the kitchen utensil. See the temperature sensor 26 of the embodiment. Alternatively, however, it is also possible to attach the temperature sensor only in the vicinity and, for example, to determine the temperature on the underside of the kitchen utensil using a physical model. Alternatively, the inaccuracy in determining the temperature on the underside of the kitchen utensil resulting from a slightly different position of the temperature sensor can be reacted to by adjusting the temperature setpoints.

The temperature measurement and the corresponding reaction to the measured values was described here for an inductively heated kitchen utensil 6 designed as a saucepan on a fully integrated induction hob 4 . However, the same approach can also be used, for example, for an inductively powered kitchen utensil with heat generation by means of a radiator under a food container or an inductively powered food processor.

Measuring the temperature on the underside of the kitchen utensil is particularly useful for temperature-limited kitchen utensils with a temperature sensor under insulation on the outside floor. See the present embodiment. However, the approaches can also be used for a so-called hot kitchen utensil, i.e. a kitchen utensil without an insulating outer shell, or only slightly temperature-reduced kitchen utensils with a spacer.

Furthermore, there is the following additional benefit: If there is a temperature sensor for measuring the temperature on the underside of the kitchen utensil, and this temperature sensor can also be operated without an active external power supply, this temperature sensor can also be used to protect the underside of the kitchen utensil from unsuitable heating devices, such as for example a gas stove, a radiant hob, a mass hob, a grill or the like. If a dangerously high temperature is detected on the underside of the kitchen utensil, an integrated warning device or a connection to mobile devices, other kitchen appliances or the like of the system according to the invention can indicate that the kitchen utensil is not suitable for this temperature. This applies in particular to insulated kitchen utensils, for example the kitchen utensil 6 of the exemplary embodiment, which are designed for inductive heat generation.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102017114943 A1 [0004]
• DE 102018124319 A1 [0005]

Claims (15)

System (2), comprising a component of the system (2) designed as an induction hob (4) and a kitchen utensil (6) for placing on the induction hob (4), wherein the kitchen utensil (6) is designed in such a way that the kitchen utensil (6 ) can be heated by means of an induction coil of the induction hob (4) when the kitchen utensil (6) is placed on the induction hob (4), and wherein the system (2) has at least one memory (8) for storing data on at least one induction hob parameter of the induction hob (4) and/or kitchen utensil parameters of the kitchen utensil (6), the system (2) being designed in such a way that the data on the at least one induction hob parameter and/or kitchen utensil parameter is automatically transmitted during operation of the induction hob (4) and/or the kitchen utensil (6). can be stored in the memory (8), characterized in that the at least one memory (8) is designed as a manipulation-protected memory is formed. system (2) after claim 1 , characterized in that the system has an access check unit which is connected to the memory (8) in a signal-transmitting and/or data-transmitting manner and is designed in such a way that the access check unit can be used to check an access authorization for an attempted access to the memory (8) and in the event of an unauthorized access attempt Access to the memory (8) is automatically prevented and, in the event of an authorized access attempt, access to the memory (8) is automatically enabled, the access checking unit being designed as a read protection and/or a write protection. system (2) after claim 2 , characterized in that the memory (8) is designed in such a way that authorized access to the memory (8) and/or an unauthorized attempt to access the memory (8) in the memory (8) cannot be overwritten and cannot be erased/documented/ is. system (2) after claim 2 or 3 , characterized in that the access verification unit is designed in such a way that the access verification unit comprises at least one of the following security techniques: password protection, token protection, digital signature protection, biometric access protection. System (2) according to one of Claims 1 until 4 , characterized in that the memory (8) has at least one memory area for safety and/or damage-related data on the at least one induction hob parameter and/or kitchen utensil parameter of a possible safety and/or damage incident in the system (2) in which the aforementioned Data are protected from resetting the memory (8) to a delivery state and/or from being changed and/or from being overwritten and/or from being deleted. system according to one of the Claims 1 until 5 , characterized in that the system additionally comprises a component which is connected to the induction hob and/or the kitchen utensil in a signal-transmitting and/or data-transmitting manner and is designed as a third-party device, with the at least one memory being physically at least partially arranged on the third-party device, preferably in that the third-party device is a server is formed. system according to one of the Claims 1 until 6 , characterized in that the at least one memory is designed as a plurality of memories, the individual memories of the plurality of memories being arranged physically distributed over at least two of the components of the system. System (2) according to one of Claims 1 until 7 , characterized in that the memory (8) is designed in such a way that the data can be read and/or written from the memory (8) by means of the induction hob (4) and/or the kitchen utensil (6) and/or the third-party device. System (2) according to one of Claims 1 until 8th , characterized in that on the underside of the kitchen utensil (6) a temperature sensor (26) for measuring the temperature on an outer base (14) of the kitchen utensil (6) is arranged. Method of operating the system (2) according to any one of Claims 1 until 9 , after which the data on the at least one induction hob parameter and/or kitchen utensil parameter is automatically stored in the at least one memory (8) during operation of the induction hob (4) and/or the kitchen utensil (6) depending on the storage capacity of the respective memory (8). that security-related and/or damage-related data of a possible security and/or damage incident in the system (2) is stored in at least one of the at least one memory (8) for a longer, previously specified period of time than non-security-related and/or damage-related data are stored in the aforesaid memory (8). procedure after claim 10 , characterized in that by means of the access check unit checks an access authorization of an attempt to access the memory (8) and in the event of an unauthorized attempt to access access to the memory (8) is automatically prevented and in the event of an authorized attempt to access access to the memory (8) is automatically enabled. procedure after claim 11 , characterized in that an authorized access to the memory (8) and/or an unauthorized attempt to access the memory (8) is/is documented in the memory (8) in a non-overwritable and non-erasable manner. Procedure according to one of Claims 10 until 12 , characterized in that the data are read from the memory (8) and/or written by means of the induction hob (4) and/or the kitchen utensil (6) and/or the third-party device. Computer program product, comprising instructions which, when the program is executed by a computer, cause the latter to carry out the method according to one of Claims 10 until 13 to execute. Computer-readable data carrier on which the computer program product Claim 14 is saved.

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