Method for heating a cooking vessel on a stove and stove

Abstract

The invention relates to a method for heating cooking vessels on a stove and to a stove. A method for heating cooking vessels on a stove with a plurality of heating devices is described. Each heating device has a heating area in which a cooking vessel can be arranged in order to be heated by the heating device under the control of a power supply. The cooking vessel has a temperature sensor and an evaluation device and a transmission device for transmitting identification and temperature data. The controller controls the heating devices in a specific manner and evaluates the received temperature data using a plurality of plausibility checks in order to determine whether the data match the operation of the heating devices. If these plausibility checks are passed, the cooking vessel is assigned to a heating device.

Description

TECHNICAL FIELD

[0001] The invention relates to a method for heating a cooking vessel on a hob, which hob has a plurality of heating devices, and also to a correspondingly designed hob. BACKGROUND

[0002] US 2020 / 0196399 A1 discloses the practice of assigning a so-called smart cooking vessel on a hob to a cooking zone or an inductive heating device. For this purpose, the smart cooking vessel is intended to be reliably identified, either by means of the inductive heating device generating energy in a specific manner, or with a specific code, and the code is identified at the cooking vessel. Corresponding data are transmitted from the cooking vessel to the controller of the hob together with the identification, and if this corresponds to the energy generation at the inductive heating device, the cooking vessel is assigned to this inductive heating device. SUMMARY

[0003] The invention is based on the object of providing a method for heating a cooking vessel on a hob, mentioned at the outset, and of providing a hob, mentioned at the outset, with which the problems in the prior art can be solved and, in particular, it is possible to heat cooking vessels well and, in particular, to heat so-called smart cooking vessels, which have a temperature sensor, as well as an evaluation device and a transmission device for transmitting identification and temperature data.

[0004] This object is achieved by means of a method having the features described below and by means of a hob having the features described below:

[0005] A method for heating a cooking vessel on a hob, which hob has a plurality of heating devices, wherein:

[0006] Each heating device has a heating area,

[0007] The cooking vessel is arranged to cover the heating area,

[0008] Each heating device is designed to generate and transmit energy in order to heat a cooking vessel arranged above it and for this purpose is controlled by an electrical power supply,

[0009] The cooking vessel has a temperature sensor, as well as an evaluation device and a transmission device for transmitting identification and temperature data, which temperature data is in the form of a temperature increase at the temperature sensor based on the energy received from the heating device, the heating area of which is at least partially covered by the cooking vessel,

[0010] The hob is provided with a receiving device for the purpose of receiving the identification and the temperature data from a transmission device of a cooking vessel or all transmission devices of a plurality of cooking vessels on the hob or in a receiving area of the receiving device,

[0011] The hob is provided with a controller which receives the identification and the temperature data from the receiving device and evaluates the identification and the temperature data with regard to information about energy transmission from the heating device,

[0012] The method has the following steps:

[0013] At least one of the cooking vessels is arranged above a heating area of a heating device,

[0014] At least the heating device is controlled by the power supply in order to generate energy and to transmit energy to the cooking vessel in a cycle, wherein the duration and / or the maximum value of the energy transmission is varied, wherein the variation in the cycle relates to:

[0015] The maximum value of the transmitted energy is varied over time, and / or

[0016] The duration of the energy transmission is varied, and / or

[0017] The duration between two operations of transmitting energy is varied, and / or

[0018] The number of operations of transmitting energy is varied,

[0019] The temperature sensor of the cooking vessel records a change or an increase in temperature as a result of the energy transmission,

[0020] The evaluation device of the cooking vessel evaluates the temperature profile as a function of time as temperature data and transmits the identification and the temperature data to the receiving device by means of the transmission device,

[0021] The controller has or receives the identification and the temperature data from the transmission device of the cooking vessel and the receiving device,

[0022] The controller calculates:

[0023] The relationship of the energy generated by the heating device to the temperature difference generated at the temperature sensor as a first plausibility result, and

[0024] The relationship of the first time derivative of the energy generated by the heating device to the maximum first time derivative of the temperature at the temperature sensor as a second plausibility result,

[0025] the first plausibility result and the second plausibility result are cached by the controller,

[0026] After each cycle, a change in the absolute temperature at the temperature sensor is checked for the received temperature data and this change is cached by the controller as a third plausibility result,

[0027] The cycle of generating and transmitting energy is executed at least twice in the same way and during each execution of the operation and after each execution of the operation the three plausibility results are each calculated and cached,

[0028] The controller performs a plausibility check for each of the three plausibility results, during which a check is performed in order to determine whether the respective plausibility result is within a plausibility range predetermined for this result and stored in the controller;

[0029] wherein, if all three plausibility checks are positive, the cooking vessel with this identification is assigned to the heating device that previously generated and transmitted energy,

[0030] and wherein, if at least one plausibility check is negative, the cooking vessel with this identification is not assigned to this heating device and / or to any heating device,

[0031] wherein these steps are executed as a check for all identifications and temperature data of cooking vessels received by the receiving device, the cooking vessels having a temperature sensor, an evaluation device and a transmission device,

[0032] wherein, if none of the checks of the temperature data of a cooking vessel in all three plausibility checks during at least two cycles is positive, the controller assumes that no cooking vessel with a temperature sensor and an evaluation device and a transmission device is placed on the heating device;

[0033] An oven designed to execute the above method. Advantageous and preferred configurations of the invention are explained in more detail below. In this case, certain features are described only for the method or only for the oven. However, in any case, they are intended to be applicable to the method and the oven autonomously and independently of each other.

[0034] In the method it is provided that each heating device has a heating area or cooking zone, in particular an area above it, and that a cooking vessel can be arranged on the hob so as to cover the heating area. In this case, each heating device is designed to generate and transmit energy in order to heat the cooking vessel arranged above it and is controlled for this purpose by an electrical power supply. The heating device can consist of a plurality of individual heating elements or can have a plurality of individual heating elements, for example in the form of a double ring heating or an induction surface cooking. Although they can be operated individually in principle, for the method according to the invention they are advantageously operated together as a single element. The heating device can be, for example, a radiant heating device which is connected directly to the electrical power supply voltage and operated with a clock using a relay, or an induction heating coil which is controlled by power electronics with variable power levels. It is also possible to provide that a plurality of these radiant heating devices or a plurality of these induction heating coils form the heating device according to the invention as heating elements, respectively. The cooking vessel has a temperature sensor and an evaluation device which can be used to detect the temperature or temperature change at the cooking vessel. In this case, the heating area of the heating device is at least partially covered by the cooking vessel. For this purpose, the temperature sensor can be arranged at a favorable position on the cooking vessel, for example on the base of the cooking vessel or inside the cooking vessel. It captures the temperature or the temperature change due to the heating. A transmission device is also provided for the purpose of transmitting the unique identification of the cooking vessel and the temperature data from the temperature sensor in the form of a temperature increase at the temperature sensor based on the energy received from the heating device. The identification of the cooking vessel can be unique and can be assigned only to a single cooking vessel.

[0035] A receiving device is provided for the hob for the purpose of receiving the identification and the temperature data from the transmission device of a cooking vessel or of all transmission devices of a plurality of cooking vessels from the hob or from the receiving area of the receiving device, that is to say, the cooking vessel can also be on a work surface next to the hob or in an underlying cabinet. A controller is provided for the hob which receives the identification and the temperature data from the receiving device and evaluates them with regard to information about the energy transmission from the heating device. Thus, the controller knows which temperature data and thus which temperature change occurs or has occurred at which cooking vessel and, due to the specific identification, it also knows the cooking vessel and can thus distinguish it from other cooking vessels.

[0036] The method has the steps mentioned below. First, at least one of the above-mentioned cooking vessels, that is to say a cooking vessel with a temperature sensor and an evaluation device and a transmission device, is arranged above the heating region of the heating device. At least the heating device is controlled by the power supply advantageously by means of so-called energy data in order to generate energy in a cycle and to transmit the energy to the cooking vessel. The duration and / or the maximum value of the energy transmission is varied within the cycle. The variation in the cycle relates to: the maximum value of the transmitted energy which varies over time; and / or the duration of the energy transmission which varies; and / or the duration between two operations of the transmitted energy which varies; and / or the number of operations of the transmitted energy which varies. The above-mentioned selection is advantageously varied.

[0037] After the start of the operation or the energy generation of the heating device, the temperature sensor of the cooking vessel records a change or an increase in temperature as a result of the transmission of energy. The evaluation device of the cooking vessel, preferably the evaluation device of each cooking vessel, evaluates the change in temperature or the temporal profile as temperature data and transmits the identity of the cooking vessel and these temperature data to a receiving device by means of the transmission device. The receiving device receives the transmitted identities and temperature data, preferably all the identities and temperature data received from the cooking vessels, and forwards them to a controller. The controller in turn calculates, preferably at the end of or after each cycle, the relationship of the energy generated by the heating device to the temperature difference or the temperature increase generated at the temperature sensor, in particular to calculate the ratio or the quotient for simplicity, which forms a first plausibility result. The controller also calculates the relationship of the first time derivative of the energy generated by the heating device to the maximum first time derivative of the temperature at the temperature sensor, in particular to calculate the ratio for simplicity, which forms a second plausibility result. Advantageously, the respective instantaneous values are taken after the process of generating energy at the heating device, that is to say when no energy is generated any more. In particular, the ratio is taken when the relationship of the plausibility results is calculated respectively, that is to say the value of the energy divided by the value of the temperature. These first and second plausibility results are cached by the controller. After each cycle, the change in the absolute temperature at the temperature sensor is checked for the received temperature data and the change is cached by the controller as a third plausibility result.

[0038] The cycle of generating and transmitting energy is carried out at least twice, advantageously exactly three times, in the same way, wherein the three plausibility results are calculated and cached respectively during and after each execution operation. The controller then carries out a plausibility check for each of the three plausibility results and checks during the plausibility check whether the respective plausibility result is within a plausibility range predetermined for the plausibility result and stored in the controller. The plausibility range is expanded in such a way that only but of course the plausibility result is within the range when the cooking vessel is arranged above the heating device.

[0039] If all three plausibility checks are positive, the cooking vessel with this identification is assigned to the heating device from which the energy was previously generated and transmitted. Thus, the temperature change at the cooking vessel that has been captured by the temperature sensor matches the energy generation at the heating device. If, however, at least one plausibility check is negative, the cooking vessel with this identification is not assigned to the heating device, and in particular not to any heating device. A fault message can be output on the hob. The reason can be that the cooking vessel has been captured or its signal has been captured, but it is not arranged above a heating device.

[0040] These steps are performed as a check for all identifications and temperature data of a cooking vessel with a temperature sensor, an evaluation device and a transmission device that is received by a receiving device. If none of the checks of the temperature data of the cooking vessel is positive in all three plausibility checks during at least two cycles, the controller assumes that, although a cooking vessel with a temperature sensor as well as an evaluation device and a transmission device has been placed on the hob or in its vicinity, it is not placed on the heating device itself to which and with which the checks are performed. If only exactly one single check of the temperature data of the cooking vessel is positive in all three plausibility checks during at least two cycles, it is assumed that exactly one single cooking vessel with a temperature sensor as well as an evaluation device and a transmission device is on the hob, precisely also exactly on the heating device itself to which and with which the checks are performed. This is the desired result, and subsequently, this cooking vessel can be heated on this heating device, for example, with a temperature capture and an automatic program. Other possible cases are also described below as alternatives.

[0041] Thus, the present application makes it possible to detect so-called smart cooking vessels with a temperature sensor on a suitable hob in order to assign them to a heating device and subsequently to heat them, wherein a temperature control is possible during heating, preferably for an automatic program. Such an automatic program with such cooking vessels with a temperature sensor is known from the prior art; see US 2020 / 0196399 A1 mentioned at the beginning, as well as US 2016 / 0095169 A1.

[0042] In one configuration of the application, if the multiple checks of the temperature data of the cooking vessel are positive in all three plausibility checks mentioned during at least two cycles, a check can be performed in order to determine whether the temperature data is received from different cooking vessels with different designations. In this case, the cooking vessel is not assigned to the heating device, since the multiple different cooking vessels can be on the same heating device or overlap above the heating device as a result of which the automatic program cannot be executed on the heating device. If the temperature data is received from a single cooking vessel with a single designation, the cooking vessel is assigned to the heating device. This is the desired case for executing the automatic program.

[0043] In another configuration of the application, if only one single check of the temperature data of the cooking vessel is positive in all three plausibility checks during at least two cycles or during all cycles that have been executed, but the associated cooking vessel has already been assigned to another heating device, no new assignment of this cooking vessel is performed. It can then still be above another heating device, but this assignment has to be deleted. This result is not plausible and can occur due to the cooking vessel moving during the plausibility check, but this has not been recorded by the stove.

[0044] In yet another configuration of the application, for a cooking vessel, if the multiple checks of the temperature data are positive in all three plausibility checks during at least two cycles, i.e. the temperature data of the cooking vessel has been checked and the plausibility check is positive for the cooking vessel, but the cooking vessel has been assigned to a heating device other than the heating device that generates and transmits the energy, a fault is detected. Each assignment of the cooking vessel to a heating device in the stove can then be deleted since there is obviously a more significant fault and this has been detected. It can also be provided that multiple cooking vessels and their temperature data are checked, but this check is only positive for one cooking vessel. Then, only this cooking vessel is also assigned to the corresponding heating device.

[0045] It can be provided that the method is performed simultaneously with only a single heating device of the stove, on the one hand, wherein although the other heating devices of the stove are preferably operated for the purpose of generating and transmitting energy, they are not operated according to the above-mentioned cycles. It is thus intended to find the smart cooking vessel that is only placed above this heating device.

[0046] It can be provided that, in another aspect, the method is carried out simultaneously with at least two heating devices of the stove, in particular even for all heating devices of the stove. In this case, the generation and transmission of energy in the at least two heating devices is different with respect to at least one of the above-mentioned maximum values, the duration of the transmission, the duration between two operations or the number of operations. As a result, the at least two heating devices are operated differently, the result of which is that the heating devices can be explicitly inferred from the temperature data sent back.

[0047] In addition to the transmission device, the cooking vessel advantageously has an integrated circuit, in particular in the form of an evaluation device, preferably a microcontroller. An energy store, such as a battery, a rechargeable battery or a capacitor, that is to say a replaceable or rechargeable energy store, can also be provided.

[0048] The heating devices are preferably controlled by the power supply in such a way that a special mode is generated which is not used by the operator during normal operation. As a result, random acknowledgments at the heating devices or the cooking vessel can be avoided. In the mentioned cycle, more than 30% of the energy with the maximum energy that can be permanently generated can advantageously be generated as high energy by the heating devices and transmitted at least twice, preferably three times. As a result, a temperature change at the cooking vessel can also be achieved within a relatively short time of, for example, less than 30 seconds, which can be clearly captured by the temperature sensor. Between each process of generating high energy, the heating devices can be controlled in such a way that only a low energy with less than 15% of the maximum energy that can be permanently generated is generated. Alternatively, it can also be provided here that the heating devices remain switched off in between. The difference between the generated high energy and the generated low energy can be said to be the important factor here.

[0049] After the lower energy generation in the mentioned cycle, the generation of high energy with more than 30% of the maximum energy that can be permanently generated can be increased accordingly, preferably by 20% to 50%, in each case. As a result, high or very high energy can be generated twice or three times within the above-mentioned time period, and no energy or only low energy can be generated in between. This pattern is then very characteristic and unique and thus cannot be confused with normal operation. At the same time, it ensures a temperature change that can be explicitly detected several times and captured using the temperature sensor.

[0050] The duration of the generation of high or very high energy can be 5 seconds to 30 seconds, preferably 10 seconds to 20 seconds. This is sufficient to heat a heavy cooking vessel even with a high heat capacity and to change its temperature in a clearly detectable manner.

[0051] The duration of the generation of the low energy can be 10 to 40 seconds, preferably 15 to 25 seconds. This is not only sufficient to not cause a further temperature increase, but often even a slight decrease, even for the cooking vessels mentioned above. This again increases the detectability and the unambiguity.

[0052] The duration of the generation of the high energy in each cycle can be approximately the same, preferably exactly the same. This can also apply to the duration of the generation of the low energy in each cycle.

[0053] The duration of the generation of the low energy in each cycle is preferably longer than the duration of the generation of the high energy, preferably even by 30 to 100%. This ensures the temperature decrease mentioned above during this time.

[0054] The duration of the entire cycle can be 40 to 240 seconds, preferably 70 to 110 seconds. The overall time required for running the entire cycle twice or three times is then certain, but the assignment of the intelligent cooking vessel to the heating device is reliable and unique.

[0055] In one configuration of the application, each cycle can be identical to the other; in particular, only a single type of cycle can be provided. In this case, the identity of the cycle can also apply to heating devices with different absolute maximum energies, which can be permanently generated by means of the heating devices generating the energy with the same energy density per unit area of the heating device in each case. There is thus also a certain comparability.

[0056] In one refinement of the application, the method can be executed on a mobile terminal or an external control device with a controller or evaluation device and a receiving device, in the case of an application activated on the mobile terminal or the external control device being activated. In this case, the mobile terminal or the external control device is connected to the hob for the purpose of controlling the hob and the power supply of the heating device.

[0057] The transmission device on the cooking vessel can be selected from the group: Bluetooth, BLE, Zigbee, NFC, WiFi. In particular, BLE is suitable, since the energy consumption is low and the usual range of BLE meets the application.

[0058] The method can advantageously be executed only on heating devices of the hob, the heating area of which is assigned to exactly one cooking vessel or on which only a single cooking vessel can be placed. In addition, heating devices provided only for heating cooking vessels are particularly advantageous. The generation of a specific energy pattern and the detection at the cooking vessel are then easier and more reliable.

[0059] The hob according to the application is designed to carry out the above-mentioned method, wherein the hob has preferably a plurality of induction heating coils as heating elements, which can each individually form a heating device or can together form a heating device. In this case, each induction heating coil or each group of induction heating coils is assigned at least one heating region, advantageously exactly one heating region.

[0060] These and other features are derived from the description and the drawings, wherein in one embodiment of the application and in other areas, individual features can each individually or in subcombinations together be implemented and can represent advantageous and inherently protectable embodiments, for which protection is claimed herein. The subdivision of the present application into individual sections and subheadings does not restrict the generality of the statements made thereunder. BRIEF DESCRIPTION OF DRAWINGS

[0061] Further advantages and aspects of the application are derived from the following description of preferred exemplary embodiments of the application, which are explained below on the basis of the drawings, in which:

[0062] Figure 1 a schematic diagram of a system with an induction hob according to the application and with a cooking vessel placed onto a heating region of an induction heating coil is shown,

[0063] Figure 2 a simplified illustration of the functioning of a cooking vessel with a temperature sensor, an evaluation device and a transmission device is shown,

[0064] Figure 3 a pattern for generating power at an induction heating coil for the purpose of generating energy is shown. DETAILED DESCRIPTION

[0065] Figure 1 a system 11 according to the application is illustrated, which has an induction hob (or electromagnetic hob) 13 according to the application and a cooking vessel 27. The induction hob 13 has a hob plate 14, which is arranged below, as an example, at a distance, with two induction heating coils 16a and 16b. In practice, there are advantageously more induction heating coils 16, for example four or six or eight or even up to twenty or thirty induction heating coils, in a so-called flat hob. These induction heating coils can each individually form the above-mentioned heating device or can together form a heating device. In this case, each induction heating coil or each group of induction heating coils is assigned at least one heating region, which is also referred to as a cooking zone.

[0066] The induction hob 13 also has a hob controller 18, which is connected to a power supply 20, a receiving device 22 for wireless communication, and an operating device 24 on the underside of the hob plate 14. These functional units are each designed in a conventional manner. The power supply advantageously has a circuit breaker in the conventional connection, which is in particular dependent on the type of heating device. Here a circuit breaker or power electronics is provided for the induction heating coil 16. If the heating device is formed by a conventional radiant heating device, a conventional relay can be used here. The operating device 24 has an operating element, which is preferably in the form of a contact switch, and advantageously has optical indicating means, such as a light indicator and / or a display, and also acoustic indicating means, such as a buzzer or a beeper. As explained at the outset, the radio standard for the receiving device 22 can in principle have various designs. It is advantageously selected from the possibilities of Bluetooth or BLE or Zigbee, WLAN, and proprietary solutions without a generally valid standard.

[0067] The cooking zones 17a and 17b are formed above the induction heating coils 16a and 16b, respectively, and have an area that approximately corresponds to the area of the induction heating coils 16, respectively. A cooking vessel 27 with a cooking vessel base 29 and a cooking vessel wall 33 and a handle 28 according to the application is arranged on the right cooking zone 17a and is placed there onto the top of the hob plate 14. A normal item G to be cooked, such as water or a liquid item to be boiled, is located in the cooking vessel. The cooking vessel 27 has the above-mentioned temperature sensor 36b in the recess 30 of the cooking vessel base 29. The temperature sensor 36b is designed in a conventional manner, in particular also fully temperature-stable, for example in the form of a PT100 or PT1000. The temperature sensor 36b captures the temperature of the cooking vessel base 29. This is important for the above-mentioned temperature capture and for the capture of the temperature of the cooking vessel base 29 and its change. This temperature of the cooking vessel base 29 changes during the operation of the induction heating coil 16a and in particular increases if the induction heating coil 16a generates power or energy and transmits it to the cooking vessel 27 or the cooking vessel base 29. The temperature sensor 36b is connected to the cooking vessel module 34 by means of a connection cable 37b, which is illustrated in an enlarged form in Figure 2 and is also explained in detail below. The cooking vessel module 34 is in wireless communication or has a radio connection with the receiving device 22 in the induction hob 13.

[0068] Furthermore, the cooking vessel module 34 can alternatively or additionally be connected to a temperature sensor 36a by means of a connecting cable 37a, which temperature sensor 36a is arranged within the cooking vessel 27, advantageously on the inside of the cooking vessel wall 33. This temperature sensor 36a can in particular capture the temperature of the item to be cooked G directly, which can be advantageous for the automatic program mentioned at the outset. In certain circumstances, the temperature of the item to be cooked G can even be better for the automatic program than the temperature of the cooking vessel base 29, which can be captured by the temperature sensor 36b. Finally, the item to be cooked G is intended to be cooked. This temperature sensor 36a can also be arranged at an even lower level and thus can be arranged even closer to the cooking vessel base 29.

[0069] Another cooking vessel 27' is illustrated in dashed lines to the right next to the induction hob 13 and is intended to be designed like the cooking vessel 27 described above. However, this cooking vessel 27' illustrated in dashed lines is not only not arranged above the same induction heating coil 16a, but is not arranged on the induction hob 13 at all. It is therefore not heated by the induction heating coil 16 of the induction hob 13 and can also not be heated at all. However, it is arranged close to the receiving device 22 so that the latter also receives signals from this cooking vessel 27' and thus temperature data. However, these temperature data represent a temperature which is essentially constant, since this cooking vessel 27' is not heated at all and thus its temperature does not change or at least not significantly. As is also explained below, this cooking vessel 27' is intended to illustrate that it is important to distinguish between different cooking vessels, which can be carried out particularly well with the present application.

[0070] Figure 2 The cooking vessel module 34 is illustrated in an enlarged form. The cooking vessel module 34 is connected to a temperature sensor 36 by means of a connecting cable 37, which temperature sensor 36 can be one of the temperature sensors 36b and 36a. In addition to the one or two temperature sensors, further sensors can also be provided, for example pressure sensors, weight sensors, etc.

[0071] The cooking vessel module 34 also has an energy store 38, which can be a rechargeable battery, and which must not store particularly large amounts of energy, particularly in the case of transmission using Bluetooth or BLE or Zigbee, but which should be as fast and loss-free as possible. An integrated circuit is also provided in the cooking vessel module 34 as an evaluation device 40, advantageously as a microcontroller. This evaluation device 40 controls a transmission device 42 of the cooking vessel 27 with a transmitting antenna 44, which is advantageously designed for the above-mentioned Bluetooth or BLE standard or Zigbee. The transmission device 42 is thus in the above-mentioned wireless communication or has a radio connection with the receiving apparatus 22. The individual or special and unique identification of the cooking vessel 27 and the corresponding temperature data from at least one of the temperature sensors 36b or 36a are thus transmitted to the receiving apparatus 22.

[0072] The cooking vessel module 34 can be magnetically fitted to the handle 28 by means of a magnet 45, for example on the underside close to the cooking vessel wall 33. As a result, the functionality of the handle 28 is impaired as little as possible. As an alternative to the magnetic fastening, a permanent connection can be provided. As a further alternative, the fastening to the handle 28 can be carried out using some type of clip or band. The cooking vessel module 34 together with the temperature sensor 36a can advantageously be removed from the cooking vessel 27 in a simple and particularly advantageous manner without tools. The electrical connection to the temperature sensor 36b, which is permanently arranged in the cooking vessel base 29, can be designed to be detachable by means of a plug-in connection. The cooking vessel 27 is a smart cooking vessel as described above as a result of the cooking vessel module 34.

[0073] Figure 3 An example of a specific predetermined time pattern for the power generation or energy generation of the individual induction heating coil 16a is illustrated. The induction heating coil 16b can also be operated in a similar form in order to capture whether the smart cooking vessel 27 is arranged above it. At the time t = 0, the induction heating coil 16a is controlled by the power supply 20 at a high or medium-high power of P = 1750 W. This is carried out in the form of a long pulse lasting 15 seconds. The power then drops considerably and only pulses at a low level, for example here between 0 W and 300 W. This forms a kind of long pause in the energy generation.

[0074] At time t = 36 seconds, the induction heating coil 16a is again operated at high power of approximately P = 2450 W, precisely again for a duration of 15 seconds, as described previously. Then, the power is again greatly reduced with a weak power pulse for a duration of approximately 20 seconds, as described previously. At time t = 72 seconds, the induction heating coil 16a is operated for a third time at very high power of P = 3450 W, precisely again for a duration of 15 seconds, as described previously. After this third very high power generation or energy generation, the induction heating coil 16a is operated at low continuous power of P = 300 W. This pattern of generating power or energy forms the cycle mentioned at the outset. This is repeated so that it is executed a total of two or even three times.

[0075] The thick line is used to show the temperature T a and T b The distribution over time, wherein the temperature T a is shown using a dashed line. The temperature T a is captured by the temperature sensor 36a, and the temperature T b is captured by the temperature sensor 36b. During the first energy generation, the temperature T b in the cooking vessel base 29 rises to approximately 85°C, and subsequently, during the low energy generation, falls to slightly above 60°C. The temperature T a according to the temperature of the item G to be cooked rises much more slowly to only 40°C, and subsequently, again slightly falls.

[0076] During the second high energy generation, the temperature T b rises to approximately 160°C, but the temperature T a only rises to approximately 70°C and with slight delay. Then, during the low energy generation, the aforementioned temperatures fall to 120°C and 60°C, respectively.

[0077] During the third very high energy generation, the temperature T b rises to approximately 210°C, but the temperature T a only rises to approximately 85°C, again with slight delay. Then, during the continued low energy generation, the aforementioned temperatures again fall.

[0078] According to the method mentioned at the outset, the values of the temperatures T a and T b , and possibly the maximum values produced shortly thereafter in each case, are captured at the end of the respective energy generation, possibly also over their entire temporal profile, by the evaluation device 40, and the temperature difference produced is thus calculated during the respective energy generation. These are the temperature data mentioned at the outset. The evaluation device 40 transmits said data to the hob controller 18 by means of the transmission device 42. For the temperature Tb The distribution of these data is 65°C, 100°C and 90°C. Since the temperature T a The distribution of these data is 65°C, 100°C and 90°C. Since the temperature T b and its temperature difference are used for the plausibility check.

[0079] The stove controller determines the energy produced by the induction heating coil 16a and transferred to the cooking vessel 27 during the three high energy productions. The energy is 26.2 kWsec the first time, 36.8 kWsec the second time and 51.8 kWsec the third time. If each of these values is subsequently divided by the temperature difference due to the energy production between the beginning and the end of the energy production as a relationship or ratio, the result for the temperature T b is 403 Wsec / °C, 368 Wsec / °C and 575 Wsec / °C. These values are stored. In this case, the plausibility range stored in the controller 18 can be between 200 Wsec / °C and 900 Wsec / °C, or even between 300 Wsec / °C and 700 Wsec / °C, for example. Since the values are within this plausibility range, this part of the check passes with a positive result. Alternatively, it is also possible to use only the last temperature value, that is to say only 575 Wsec / °C. However, this value is also clearly within the mentioned plausibility range. However, the check of the three high energy productions, which are clearly different from the continuous average energy production with the mentioned three values, and which also make it possible to distinguish from a random energy production, would then be omitted.

[0080] For the second plausibility result, the ratio of the first temporal derivative of the energy produced by the induction heating coil 16a to the maximum first temporal derivative of the temperature T b at the temperature sensor 36b is determined as a relationship according to the application. This is carried out in that firstly the first temporal derivative of the temperature T b is observed over a period of a few seconds, for example over a period of 5 seconds in each case, and the highest value of this first temporal derivative is determined. If a value is not exceeded again within 5 seconds, it is taken as the highest point or maximum value. Here, the respective maximum values of the first temporal derivative of the temperature T b are 6°C / sec in the first high energy production, 6.7°C / sec in the second high energy production and 8.6°C / sec in the third high energy production. These values can be stored. If the first temporal derivative of the energy produced by the induction heating coil 16a is divided by the maximum first temporal derivative of the temperature T bThe ratio of the first time derivative of the temperature T and the first time derivative of the power P is formed as a relationship according to the application, then here the values 292 Wsec / °C, 365 Wsec / °C and 401 Wsec / °C are derived as plausibility results. The plausibility range here can be between 100 Wsec / °C and 600 Wsec / °C, as a result of which the mentioned plausibility results each lie within the range. This plausibility check is also positive and thus passed.

[0081] The absolute temperature T at the temperature sensor 36b at the end of the low-energy production in a few seconds b The change in the temperature T of the temperature sensor 36a is determined as a third plausibility result, that is to say here the temperature drop of 55°C at the end of the low-energy production in each case is derived as a plausibility result. The plausibility range here can be between +5°C and -60°C, as a result of which this third plausibility check is also positive and thus passed.

[0082] Therefore, since all three plausibility checks are positive, the cooking vessel 27 with its transmitted identification is assigned to the induction heating coil 16a. The controller 18 can then start an automatic program for the cooking vessel 27, wherein the temperature sensor 36a can in particular be used for temperature control here. The temperature data or temperature results are then used to control the induction heating coil 16a.

[0083] If one of the three plausibility checks is negative, the cooking vessel 27 will not be assigned. This is indeed a strict check criterion, but errors can thus be avoided.

[0084] Although Figure 1 The cooking vessels 27' shown on the right in Fig. 2 can also emit their identification and temperature data, but they can indicate a constant temperature, since the cooking vessels are not heated. The cooking vessels 27' are therefore not assigned to any induction heating coil 16, in particular not to the induction heating coil 16a, which produced the energy in order to detect the smart cooking vessel.

[0085] If the smart cooking vessel should be checked against another induction heating coil on the hob 13, for example the induction heating coil 16b, then it is also controlled with a similar energy production pattern to Figure 3 The same energy production pattern is completely unproblematic, since here the checks are performed at different times with the induction heating coil 16a. If no smart cooking vessel is arranged above it, the controller 18 receives only temperature data of the cooking vessels 27. However, these temperature data do not match the energy production pattern, but only correspond to the operation of the induction heating coil 16a. This is recorded by the controller 18 and the assignment of the cooking vessels 27 does not change and neither does the induction heating coil 16b receive a cooking vessel.

[0086] If there is a smart cooking vessel present above the induction heating coil 16b, the controller 18 receives temperature data of both cooking vessels 27, wherein only those data of the cooking vessels 27 which are present above the induction heating coil 16b match the energy generation pattern. If the plausibility check here is successful, the corresponding assignment is carried out.

Claims

1. A method for heating cooking vessels on a stove, the stove having a plurality of heating devices, wherein: each heating device has a heating area, a cooking vessel is arranged to cover the heating area, each heating device is designed to generate and transmit energy in order to heat a cooking vessel arranged above it and for this purpose is controlled by an electrical power supply, the cooking vessel has a temperature sensor and an evaluation device and a transmission device for transmitting an identification and temperature data, the temperature data being in the form of a temperature increase at the temperature sensor based on the energy received from the heating device, wherein the heating area of the heating device is at least partially covered by the cooking vessel, the stove is provided with a receiving device for receiving the identification and the temperature data from the transmission device of a cooking vessel or all transmission devices of a plurality of cooking vessels from the stove or from a receiving area of the receiving device, the stove is provided with a controller which receives the identification and the temperature data from the receiving device and evaluates the identification and the temperature data with regard to information about the energy transmission from the heating device, wherein the method has the following steps: at least one cooking vessel is arranged above the heating area of a heating device, at least this heating device is controlled by the electrical power supply in order to generate energy and to transmit energy to the cooking vessel in a cycle, wherein the duration and / or the maximum value of the energy transmission is varied, wherein the variation in the cycle relates to: a variation of the maximum value of the transmitted energy over time, and / or a variation of the duration of the energy transmission, and / or a variation of the duration between two operations of transmitting energy, and / or a variation of the number of operations of transmitting energy, the temperature sensor of the cooking vessel records a change or an increase in temperature as a result of the energy transmission, the evaluation device of the cooking vessel evaluates the temperature profile as a function of time as temperature data and transmits the identification and the temperature data to the receiving device by means of the transmission device, the controller has or receives the identification and the temperature data from the transmission device of the cooking vessel and the receiving device, the controller calculates: a relationship of the energy generated by the heating device to the temperature difference generated at the temperature sensor as a first plausibility result, and a relationship of the first time derivative of the energy generated by the heating device to the maximum first time derivative of the temperature at the temperature sensor as a second plausibility result, the first plausibility result and the second plausibility result are cached by the controller, after each cycle, a change in the absolute temperature at the temperature sensor is checked for the received temperature data and this change is cached by the controller as a third plausibility result, the cycle of generating and transmitting energy is carried out at least twice in the same way and during and after each execution of the operation the three plausibility results are each calculated and cached, the controller calculates the relationship of the energy generated by the heating device to the temperature difference generated at the temperature sensor as a first plausibility result, and the controller calculates the relationship of the first time derivative of the energy generated by the heating device to the maximum first time derivative of the temperature at the temperature sensor as a second plausibility result, the first plausibility result and the second plausibility result are cached by the controller, after each cycle, a change in the absolute temperature at the temperature sensor is checked for the received temperature data and this change is cached by the controller as a third plausibility result, the cycle of generating and transmitting energy is carried out at least twice in the same way and during and after each execution of the operation the three plausibility results are each calculated and cached, The controller performs a plausibility check for each of the three plausibility results, during which a check is performed in order to determine whether the respective plausibility result is within a plausibility range predetermined for this result and stored in the controller; wherein, if all three plausibility checks are positive, the cooking vessel with this identification is assigned to the heating device from which energy was previously generated and transmitted, and wherein, if at least one plausibility check is negative, the cooking vessel with this identification is not assigned to this heating device and / or to any heating device, wherein these steps are performed as a check for all identifications and temperature data of cooking vessels received by the receiving device, the cooking vessels having temperature sensors, evaluation devices and transmission devices, wherein, if none of the checks of the temperature data of a cooking vessel in all three plausibility checks during at least two cycles is positive, the controller assumes that no cooking vessel having a temperature sensor as well as an evaluation device and a transmission device is placed on the heating device.

2. The method of claim 1, wherein, If only exactly one single check of the temperature data of a cooking vessel in all three plausibility checks during at least two cycles is positive, exactly one single cooking vessel having a temperature sensor as well as an evaluation device and a transmission device is assumed to be on the heating device.

3. The method of claim 1, wherein, If multiple checks of the temperature data of a cooking vessel in all three plausibility checks during at least two cycles are positive, a check is performed in order to determine whether the temperature data is received from different cooking vessels having different identifications, wherein in this case a cooking vessel is not assigned to a heating device, wherein, if the temperature data is received from a single cooking vessel, this cooking vessel is assigned to the heating device.

4. The method of claim 1, wherein, If only one single check of the temperature data of a cooking vessel in all three plausibility checks during at least two cycles is positive, but the associated cooking vessel has already been assigned to another heating device, no new assignment is performed.

5. The method of claim 1, wherein, For a cooking vessel for which multiple checks of the temperature data in all three plausibility checks during at least two cycles are positive, i.e. the temperature data of the cooking vessel has been checked and for which the plausibility check is positive, but the cooking vessel has been assigned to a heating device other than the heating device from which energy was generated and transmitted, a fault is detected and each assignment of a cooking vessel to a heating device in the stove is deleted.

6. The method of claim 1, wherein, The method is performed simultaneously only with a single heating device of the stove, wherein, although the other heating devices of the stove are operated for the purpose of generating and transmitting energy, they are not operated in accordance with the above-mentioned cycles.

7. The method of claim 1, wherein, The method is performed simultaneously with at least two heating devices of the stove, wherein the generation and transmission of energy in the two heating devices is different with respect to at least one of the above-mentioned maximum value, transmission duration, duration between two operations or number of operations.

8. The method of claim 1, wherein, In addition to the transport device, the cooking vessel has an integrated circuit and also has an energy store.

9. The method of claim 1, wherein, The heating device is controlled by the power supply in such a way that more than 30% of the maximum energy that can be permanently produced is generated as high energy at least twice in a cycle, wherein between each high-energy generation the heating device is controlled in such a way that low energy with less than 15% of the maximum energy that can be permanently produced is generated.

10. The method of claim 9, wherein, After the lower energy generation in a cycle, the generation of high energy with more than 30% of the maximum energy that can be permanently produced is increased.

11. The method of claim 10, wherein, After the lower energy generation in a cycle, the generation of high energy with more than 30% of the maximum energy that can be permanently produced is increased by 20% to 50% in each case.

12. The method of claim 9, wherein, The duration of the generation of high energy is 5 seconds to 30 seconds.

13. The method of claim 9, wherein, The duration of the generation of low energy is 10 seconds to 40 seconds.

14. The method of claim 9, wherein, The duration of the generation of high energy is the same in each cycle.

15. The method of claim 9, wherein, The duration of the generation of low energy is the same in each cycle.

16. The method of claim 9, wherein, The duration of the generation of low energy is 30% to 100% longer than the duration of the generation of high energy in each cycle.

17. The method of claim 9, wherein, The duration of the entire cycle is 40 seconds to 240 seconds.

18. The method of claim 1, wherein, Each cycle is identical to another cycle and there is only a single type of cycle.

19. The method of claim 18, wherein, The identity of the cycle also applies to heating devices with different absolute maximum energies that can be permanently produced by means of heating devices that generate energy with the same energy density in each case as energy per unit area.

20. The method of claim 1, wherein, The method is performed on a mobile terminal or an external control device with a controller and a receiving device, which is the case if an application on the mobile terminal is active or the external control device is activated, wherein the mobile terminal or the external control device is connected to the stove for the purpose of controlling the stove and the power supply of the heating device.

21. The method of claim 1, wherein, The method is performed only on those heating devices whose heating area is assigned to exactly one cooking vessel.

22. The method of claim 8, wherein, The energy store is a battery or a capacitor.

23. The method of claim 8, wherein, The energy store is a rechargeable battery.

24. A stove designed to perform the method according to claim 1.

25. The range as defined in claim 24 wherein, The stove has a plurality of induction heating coils as heating devices, wherein at least one induction heating coil is assigned to each heating area.

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