Temperature measuring device with core temperature sensor

Abstract

The invention relates to a core temperature sensor (1) with an elongated measuring tube (2) having a plurality of NTC resistors (NTC, NTC1a-NTC1d, NTC2), wherein at least two of the NTC resistors (NTC1a-NTC1d, NTC2) have mutually different R / T characteristics (RT1, RT2). The temperature measuring device (1) has the core temperature sensor (1) and a data processing device (6), wherein the different R / T characteristics (RT1, RT2) of the NTC resistors (NTC1a-NTC1d, NTC2) of the core temperature sensor (1) are callable by means of the data processing device, and the temperature measuring device (1) is set up for selecting the R / T characteristics (RT1, RT2) depending on a predetermined temperature target value (Tsoll), measuring the resistance value (R(t)) of at least one NTC resistor (NTC1a-NTC1d, NTC2) belonging to the selected R / T characteristics (RT1, RT2), and determining the corresponding temperature value (T(t)) depending on the resistance value (R(t)) and the associated selected R / T characteristics (RT1, RT2). The invention is particularly advantageously applicable to domestic cooking devices, in particular ovens and cooking devices with a heatable base, such as grills, hot stones, etc.

Description

TECHNICAL FIELD

[0001] The present invention relates to a core temperature sensor having an elongated measuring tube with a plurality of NTC resistors. The present invention further relates to a temperature measuring device having such a core temperature sensor and a data processing device, wherein the data processing device is set up to measure a resistance value of at least one NTC resistor and to determine a corresponding temperature value from the resistance value and the associated R / T characteristic. The present invention further relates to a cooking device having a control device for controlling a cooking run of the cooking device, wherein the cooking device can be coupled with a temperature measuring device and the control device is set up to receive temperature values from the temperature measuring device for controlling the cooking run. The present invention further relates to a set of devices comprising a temperature measuring device and at least one cooking device having a cooking space, to which the temperature measuring device can be connected. The present invention further relates to a method for operating a cooking device and a temperature measuring device connected thereto, wherein the temperature measuring device determines corresponding temperature values and transmits these temperature values to the cooking device. The present invention is particularly advantageously applicable to domestic cooking devices, in particular ovens and cooking devices having a heatable base, such as a grill, hot stones, etc. BACKGROUND

[0002] Core temperature sensors of the related type for insertion into a cooking object to measure the internal temperature of the cooking object are known. Here, an NTC resistor (heat conductor) is usually used as a temperature sensor, which is arranged in a measuring tube. The measuring tube is usually configured in a rectangular shape for simple insertion into the cooking object. Core temperature sensors are also known, which have a plurality of identical NTC resistors arranged distributed along the measuring tube, so-called "multipoint core temperature sensors". Multipoint core temperature sensors enable temperature measurement at different points along the measuring tube.

[0003] DE 10 2006 024 130 A1 discloses a cooking process sensor, which can be positioned freely in a baking / cooking space and / or can be inserted at least partially into a baked / cooked object. The cooking process sensor has a stop between a handle and at least two temperature sensors for detecting the core temperature on a piercing measuring tube of the cooking process sensor, which are arranged in the vicinity of the temperature sensor of the cooking process sensor, the stop being fixedly connected with the piercing measuring tube and preferably forming one unit with the piercing measuring tube of the cooking process sensor. Preferably, the stop is configured as a thin, planar body. Between the stop and the handle of the cooking process sensor, at least one temperature sensor is arranged in and / or on the piercing measuring tube, which measures the temperature of the air flow immediately adjacent to the baked / cooked object.

[0004] DE 10 2009 019 613 A1 discloses a temperature measuring device for cooking objects, in particular for meat, having an elongated, in particular lance-like temperature sensor for insertion into a cooking object, wherein a first temperature sensor is arranged on a free end region of the temperature sensor, by means of which the internal cooking object temperature can be detected, and wherein a second temperature sensor is arranged on an end region of the temperature sensor facing away from the free end region, by means of which the ambient temperature can be measured.

[0005] However, it is disadvantageous that, for NTC resistors, due to their logarithmic R / T characteristic, only in a relatively narrow temperature range, high measurement accuracy and high measurement resolution are produced for a plurality of practical applications. Thus, if significantly different temperatures are to be measured with NTC resistors, one has to accept a relatively low measurement accuracy within this range. The possibility of achieving a high measurement accuracy with temperature-dependent resistors over a wider temperature range is to use PTC resistors (cold conductors), which have a more linear R / T characteristic than NTC resistors. However, PTC resistors are significantly more expensive than NTC resistors. SUMMARY

[0006] It is the task of the present invention to at least partially overcome the disadvantages of the prior art and, in particular, to provide an inexpensive possibility for measuring temperatures by means of a core temperature sensor, which also produces high measurement accuracy and measurement resolution for a wider spaced temperature, respectively.

[0007] This task is solved by the core temperature sensor, the temperature measuring device, the cooking device, the group of devices comprising the temperature measuring device, the cooking device having a cooking space and the cooking device having a heatable cooking base, and the method for operating the cooking device together with the temperature measuring device presented by the present invention. Advantageous embodiments are also the subject of the description and the figures.

[0008] The task is solved by a temperature sensor ("core temperature sensor") having an elongated measuring tube with a plurality of NTC resistors, wherein at least two NTC resistors have mutually different R / T characteristics.

[0009] The following advantages are thereby achieved, namely that different, even widely spaced temperature ranges can be sensed with high measurement accuracy and measurement resolution, since the NTC resistors used for determining the temperature or evaluated, which provide the highest measurement accuracy or the best combination of high measurement accuracy and high measurement resolution for the temperature range to be sensed. Here, since the NTC resistors are inexpensive to provide, the core temperature sensor can still always be implemented inexpensively.

[0010] Another advantage is that the core temperature sensor can thus also be used in application areas different from core temperature sensing, whose temperature range differs greatly from the temperature range to be sensed (typically 70 to 100°C) that is usual for core temperature sensing. The core temperature sensor can then also be referred to as a combined core temperature sensor.

[0011] The NTC resistors selected for a specific temperature range to be sensed correspond, inter alia, to NTC resistors that have a particularly high / highest measurement accuracy or a particularly advantageous compromise between measurement accuracy and measurement resolution in this temperature range. In contrast, a temperature range can be assigned to an NTC resistor in which this NTC resistor (and no other NTC resistor with other R / T properties) is sensed for temperature determination. This temperature range is also referred to as "preferred temperature range" in the following. The preferred temperature range can be determined, for example, during the design of the core temperature sensor or of a cooking device connected thereto.

[0012] The NTC resistors with different R / T properties thus have different preferred temperature ranges. The different preferred temperature ranges can be mutually translatable or spaced apart from one another, but in particular do not overlap, in order to achieve clarity in the selection of NTC resistors or R / T properties.

[0013] The core temperature sensor has at least two NTC resistors with mutually different R / T properties, i.e. different temperature-dependent resistance values R (also referred to as R(T) or R T ). The R / T properties can be represented as R / T curves (also referred to as R / T characteristic curves) or calculated from Steinhart-Hart equations or Beta equations and are specific to the resistor. For example, the core temperature sensor can thus have at least two NTC resistors with different R / T curves.

[0014] One refinement is that the core temperature sensor has a handle on the end region of the measuring tube. This facilitates handling. It is a refinement if the handle projects laterally beyond the measuring tube, which has the advantage that the handle can also be used as a mechanical stop. It is also particularly advantageous in thermal terms if electrical or electronic components (if present) other than the NTC resistors are arranged in the region of the handle. On its other free end region, the measuring tube is advantageously tapered, which facilitates insertion into the cooking substance.

[0015] An improvement is that the core temperature sensor is provided for wired or wireless communication with the cooking device. Thus, the cooking device can receive the temperature values sensed by the core temperature sensor and be used for controlling the cooking device. In the wired improvement, the core temperature sensor has a cable or wire by means of which the core temperature sensor can be connected to the cooking device. The connection by wire has the advantages of a particularly simple connection, high immunity to interference and the possibility of supplying the core temperature sensor with electrical energy by wire. Alternatively or additionally, the core temperature sensor can be equipped with a wireless communication device, for example a Bluetooth module, which is provided for communication with a corresponding communication device of the cooking device.

[0016] An improvement is that the core temperature sensor has exactly two NTC resistors with mutually different R / T characteristics. This can be realized particularly inexpensively.

[0017] An improvement is that the core temperature sensor has at least one component which respectively has a plurality of NTC resistors with identical R / T characteristics in each component, in particular a plurality of identical NTC resistors. The following advantage is thus achieved, that a spatially resolved temperature measurement can be performed by means of the NTC resistors belonging to one component. The core temperature sensor can then serve as a multipoint core temperature sensor at least for the preferred temperature range belonging to the component. The plurality of NTC resistors of one component can be arranged distributed along the measuring tube.

[0018] An embodiment is that the core temperature sensor has at least one component which respectively has a plurality of NTC resistors with identical R / T characteristics in each component and NTC resistors with different R / T characteristics. The following additional advantage is thus achieved compared to the above-mentioned improvement, that additionally a non-spatially resolved temperature measurement can be performed with high measurement accuracy and measurement resolution for the preferred temperature range assigned to the individual NTC resistors.

[0019] An embodiment is that the core temperature sensor has at least two components which respectively have a plurality of NTC resistors with identical R / T characteristics in each component. The following advantage is thus achieved, that a spatially resolved temperature measurement can be performed for a plurality of preferred temperature ranges belonging to the respective component.

[0020] An improvement is that the core temperature sensor has NTC resistors with more than two mutually different R / T characteristics. The more NTC resistors have different R / T characteristics, the more preferred temperature ranges can be provided and can be sensed with high measurement accuracy. This advantageously expands the possible measurement and application range of the core temperature sensor.

[0021] One design proposal is that at least one NTC resistor with a "first" R / T characteristic is provided for sensing temperatures between 70°C and 100°C (and thus has its preferred temperature range there). This temperature range is particularly advantageous for measuring the core temperature of a cooking object (for example meat). One refinement is that there are multiple such NTC resistors, so that a spatially resolved temperature measurement within the cooking object is possible and thus, for example, the core temperature can be determined particularly precisely.

[0022] One design proposal is that at least one further NTC resistor with a further ("second") R / T characteristic is provided for sensing temperatures above 150°C, in particular above 180°C. This has the advantage that the core temperature sensor can also be used as a temperature sensor for precisely detecting high temperatures. Such temperatures can be, for example, operating temperatures of a cooking device, for example the cooking space temperature of an oven, the temperature of a cooking accessory (for example a heatable cooking space divider) and / or the temperature of a heatable cooking base, for example a pizza stone, a bread baking stone, a hot stone, a baking tray, a grill, a teppanyaki, etc.

[0023] A design proposal that is particularly advantageous for the temperature range above 150°C to be sensed is that at least one NTC resistor with its preferred temperature range there is a glass-encapsulated NTC resistor. It is thus advantageous that even at such high temperatures, a high measurement accuracy can be achieved in an inexpensive manner.

[0024] The task is also solved by a temperature measuring device with a core temperature sensor as described above and a data processing device, wherein different R / T characteristics of the temperature sensor of the core temperature sensor are callable by means of the data processing device, and the temperature measuring device, in particular the data processing device, is set up for

[0025] - selecting an R / T characteristic depending on a predetermined temperature rating,

[0026] - measuring the resistance value of at least one NTC resistor belonging to the selected R / T characteristic, and

[0027] - determining a corresponding temperature value depending on the resistance value and the associated selected R / T characteristic.

[0028] The temperature measuring device can be constructed analogously to the core temperature sensor and vice versa and has the same advantages.

[0029] The data processing device can be integrated into the core temperature sensor, e.g. in the form of a microprocessor, ASIC or FPGA which is arranged in the core temperature sensor, in particular in its handle. If the data processing device is integrated into the core temperature sensor, the expressions temperature measuring device and core temperature sensor can be used synonymously. However, the data processing device can also be a device separate from the core temperature sensor, e.g. as a device integrated into a cooking device which can be coupled in data technology with the core temperature sensor.

[0030] The "different R / T characteristics being available" can include that these R / T characteristics are available to the data processing device and are used by the data processing device for the conversion. To this end, the R / T characteristics can be saved in a data memory of the data processing device or in a data memory which is coupled in data technology with the data processing device. For example, different R / T curves can be stored in the data memory as characteristic curves, e.g. in the form of a look-up table, and / or material-specific Steinhart-Hart coefficients (usually denoted with a0, a1 and a3) or material-specific coefficients of the Beta equation (e.g. the material constants B or ß and the nominal resistance) for different NTC resistors can be stored in the data memory.

[0031] The "temperature measuring device, in particular the data processing device, is set up for selecting a specific R / T characteristic depending on a predetermined temperature rating" includes in particular that the temperature measuring device receives a temperature rating, e.g. from a cooking device which is coupled in data technology therewith, and selects the R / T characteristic or the related at least one NTC resistor which is best suited for this temperature rating. The selection can be performed, for example, in such a way that the data processing device checks whether the temperature rating falls into a specific preferred temperature range and, if this is the case, selects the R / T characteristic which belongs to this preferred temperature range. In a variant, if the temperature rating does not fall into a preferred temperature range, a specific R / T characteristic can be selected depending on predetermined criteria, e.g. the R / T characteristic whose preferred range is closest to the temperature rating.

[0032] The "temperature measuring device, in particular the data processing device, is set up for measuring the resistance value of at least one NTC resistor which belongs to the selected R / T characteristic" includes in particular that the resistance value of the NTC resistor with the selected R / T characteristic is measured specifically, in particular only. The resistance values of the other NTC resistors are either ignored or not measured at all. The last case can be realized, for example, in such a way that the measurement converter circuit (e.g. comprising an A / D converter) is connected to one of the NTC resistors individually, but only to the NTC resistor with the selected R / T characteristic.

[0033] The "temperature measuring device, in particular data processing device, is set up to determine the corresponding temperature value from the resistance value and the associated selected R / T characteristic" in particular comprises: at least one resistance value of an NTC resistance with a selected R / T characteristic is measured and used as an input variable for determining the temperature, more precisely based on the selected R / T characteristic, for example by adjusting the R / T characteristic or in a formula according to the Steinhart-Hart equation or the Beta equation. The temperature value can then be used to control the cooking device, for example in order to trigger an action when the nominal core temperature is reached, or to set or adjust the operating temperature.

[0034] One design proposal is that the temperature nominal value is predetermined or predeterminable by the cooking device in data-technological connection with the temperature measuring device, if the data processing device is integrated into the cooking device, only with the core temperature sensor.

[0035] One improvement proposal is that the temperature nominal value can be predetermined automatically by the cooking device, for example also in accordance with an automatically running cooking program or recipe.

[0036] One improvement proposal is that the temperature nominal value corresponds to a temperature nominal value which is adjustable on the cooking device on the user side. Here, the temperature nominal value adjustable on the user side can already correspond to a value which is transmitted to the temperature measuring device, in particular data processing device (for example "90°C" or "200°C"), or can be converted by the cooking device into a corresponding temperature nominal value (for example "medium" is set to a temperature nominal value of 90°C and "on" to a temperature nominal value of 100°C, etc., or "medium hot" is set to a temperature nominal value of 200°C and "very hot" to a temperature nominal value of 250°C), or a specific temperature or cooking phase (for example a range from "1" to "9" is converted into corresponding staggered temperature nominal values between 150°C and 250°C, etc.).

[0037] One improvement proposal is also that the application set on the user side or set program-controlled is converted into a temperature nominal value by the cooking device, for example in the case of a core temperature function, the cooking run is set to a temperature nominal value in the most suitable preferred temperature range between 70°C and 100°C.

[0038] It is also possible that no temperature rating value is transmitted to the temperature measuring device, but that information about the function of the setting of the core temperature sensor is transmitted "indirectly". Thus, a cooking device for using the core temperature function can transmit a code (e.g. "0") to the temperature measuring device 10, which selects a R / T characteristic set for measuring the core temperature in accordance with the code. In contrast, if the core temperature sensor is used for measuring the operating temperature of a grill or the like, for example, a different code (e.g. "1") is transmitted to the temperature measuring device, which selects a different R / T characteristic set for higher temperatures in accordance with the code.

[0039] The task is also solved by a cooking device having a control device for controlling a cooking operation of the cooking device, wherein the cooking device can be coupled with a temperature measuring device as described above, and is set up for transmitting a temperature rating value to the temperature measuring device, and wherein the control device is set up for receiving a temperature value from the temperature measuring device for controlling the cooking operation.

[0040] The cooking device can be constructed similar to the temperature measuring device and / or the core temperature sensor, and vice versa, and has the same advantages.

[0041] The cooking device is advantageously a domestic cooking device. One refinement is that the cooking device has a cooking space, for example an oven and / or a steam cooking device. One refinement is that the cooking device has a heatable cooking base, or for example a pizza stone, a bread baking stone, a "hot stone", a baking tray, a grill, a teppanyaki, etc.

[0042] The temperature rating value can be for example a core temperature of a cooked item or an operating temperature of the cooking device, for example of a heatable cooking base.

[0043] The temperature rating value can be set by an operating device, for example a rotary knob, a button, a touch display, etc., which is operable on the user side. However, the regulating device can also be for example a control device of the cooking device, which sets the temperature rating value for example on the basis of a user input or a cooking program.

[0044] The control of the cooking operation can include a comparison of the temperature value received from the temperature measuring device with the temperature rating value or a value derived therefrom, for example for adjusting the operating temperature or for monitoring the achievement of the core temperature, etc.

[0045] The task is also solved by a set of devices, which comprises a temperature measuring device with a core temperature sensor as described above, and further comprises at least one cooking device with a cooking space as described above (for example an oven) and a cooking device with a heatable cooking base as described above (for example a grill), which has an accommodation for the measuring tube of the core temperature sensor, wherein the cooking devices are configured for coupling with the same temperature measuring device, wherein the cooking device with the cooking space is set up for using the temperature values received by the core temperature sensor for monitoring the core temperature of a cooking object, and wherein the cooking device with the heatable cooking base is set up for using the temperature values received by the core temperature sensor for adjusting the operating temperature of the heatable cooking base.

[0046] The task is also solved by a method for operating a cooking device as described above, wherein

[0047] - a temperature rating value is transmitted from the cooking device to the temperature measuring device, in particular to its data processing device, and

[0048] - the relevant R / T characteristic is selected depending on the temperature rating value,

[0049] - the measurement values of at least one NTC resistance belonging to the selected R / T characteristic are sensed,

[0050] - the corresponding temperature values are determined from these measurement values depending on the relevant R / T characteristic, and

[0051] - these temperature values are transmitted to the cooking device.

[0052] The method can be designed analogously to the device, and vice versa, and has the same advantages. BRIEF DESCRIPTION OF DRAWINGS

[0053] The above-mentioned characteristics, features and advantages of the present application as well as the way and method of realizing them become more clear and more easily understandable in connection with the following schematic description of embodiments, which are explained in detail in connection with the drawings.

[0054] Figure 1 A sketch of a core temperature sensor according to the present application is shown in a side view as a sectional view;

[0055] Figure 2 A sketch of a measurement transducer circuit and a microprocessor of a core temperature sensor according to the present application is shown;

[0056] Figure 3 A set of devices is shown, which has two cooking devices and a core temperature sensor according to the present application; and

[0057] Figure 4A possible method flow according to the application for operating a core temperature sensor is shown. DETAILED DESCRIPTION

[0058] Figure 1 A sketch of a multipoint core temperature sensor 1 according to the application is shown in a side view as a sectional view, which has a lance-like measuring tube 2, the free end region of which in front is tapered and on the other, rear end region a handle 3 laterally projects beyond the measuring tube 2. NTC resistors NTC1a, NTC1b, NTC1c, NTC1d, NTC2 are arranged in the measuring tube 2. The NTC resistors NTC1a to NTC1d and NTC2 are connected by electrical lines (top view) with a selection circuit 4, which is connected with a measuring transducer circuit 5, which in turn is connected with a data processing device in the form of a microprocessor 6, for example. The selection circuit 4, the measuring transducer circuit 5 and the microprocessor 6 are here arranged in the handle 3.

[0059] The selection circuit 4 can be controlled by the microprocessor 6 for connecting a specific NTC resistor of the NTC resistors NTC1a to NTC1d, NTC2 with the measuring transducer circuit 5. The measuring transducer circuit 5 serves for determining the current resistance value R(t) of the NTC resistor NTC or NTC1a to NTC1d, NTC2 connected therewith and provides this as a digitized resistance value R(t) to the microprocessor 6.

[0060] The microprocessor 6 calculates from the digitized resistance value R(t) a current temperature value T(t) and can transmit this wirelessly or as shown by a cable 7 to a cooking device Gl or G2 (see Figure 3 ).

[0061] Since the microprocessor 6 is integrated into the core temperature sensor 1 and the core temperature sensor 1 thus outputs the currently measured temperature value T(t), the core temperature sensor 2 corresponds to a temperature measuring device.

[0062] Figure 2 A sketch of the measuring transducer circuit 5 and the microprocessor 6 of the core temperature sensor 1 is shown.

[0063] From the cooking device Gl, G2 connected therewith at least in data technology (and if necessary also for the supply of the core temperature sensor 1) the microprocessor 6 obtains via the cable 7 a temperature target value Tsoll. Subsequently, the R / T curve RT1 or RT2 or at least one corresponding NTC resistor NTC1a to NTC1d or NTC2 assigned to this temperature target value Tsoll is selected on the basis of at least one predetermined criterion. For this purpose, the microprocessor 6 has or is coupled with a data memory 6a in which the R / T curves RT1, RT2 are stored (for example in a look-up table).

[0064] In one variant, the preferred temperature ranges VB1 or VB2 can be assigned to the R / T curves RT1 and RT2 or the corresponding NTC resistors NTC1a to NTC1d or NTC2, respectively. If the temperature target value Tsoll falls into one of the preferred temperature ranges VB1 or VB2, the associated R / T curve RT1 or RT2 is selected. The preferred temperature ranges VB1 and VB2 are drawn here spaced apart from one another, but can alternatively be adjacent to one another or transition into one another.

[0065] If a particular R / T curve RT1 or RT2 has been selected, the NTC resistors NTC belonging to at least one of these R / T curves RT1 or RT2 are connected to the measurement transducer circuit 5 by means of the selection circuit 4. The connection of the NTC resistors NTC can include the connection of the NTC resistors NTC2 belonging to the R / T curve RT2 or the temporal alternation of the connection of the NTC resistors NTC1a to NTC1d belonging to the R / T curve RT1.

[0066] The measurement transducer circuit 5 includes an ohmic resistor Rref with a precisely known resistance value, which is connected in series with the NTC resistor NTC. An intermediate tap Vout of the resistor chain Rref, NTC is connected to the input of an A / D converter ADC. The NTC resistor NTC is also connected electrically in parallel with a capacitor C. The resistor chain Rref, NTC and the A / D converter ADC are located on a voltage Vcc corresponding to the operating voltage of the A / D converter ADC. Thereby, the measurement transducer circuit 5 can sense the resistance value of the NTC resistor NTC and output it as a current digitized measurement value R(t) to the microprocessor 6.

[0067] The microprocessor 6 calculates a current temperature value T(t) from the digitized measurement value R(t) depending on the selected R / T curve RT1 or RT2 and provides it to the cooking device G1 or G2 via a cable 7.

[0068] Figure 3 A set of devices 1, G1, G2 is shown, which includes the core temperature sensor 1, a cooking device G1 in the form of an oven and a cooking device G2 in the form of a grill, for example a grid grill, a wheel grill, a hot stone, a pizza stone, a teppanyaki, etc.

[0069] The oven G1 has a heatable cooking space 8 and for controlling the oven a control device 9. The control device 9 is also set up, e.g. programmed, for controlling the cooking process in the case of use of the core temperature sensor 1. If the core temperature sensor 1 is connected to the oven G1, the control device 9 can use, for example, the current temperature values T(t) transmitted by the core temperature sensor 1 in order to compare them with a core temperature target value, which reflects, for example, a desired degree of cooking of a cooking object to be cooked in the cooking space 8. If the core temperature sensor 1 is connected to the oven G1, the control device 9 can transmit the core temperature target value to the core temperature sensor 1 as a temperature target value Tsoll. Since the core temperature target value is usually in the temperature range of 70°C to 100°C and this temperature range corresponds, for example, to the preferred temperature range VB1 or is contained in VB1, the core temperature sensor 1 selects the relevant R / T curve RT1. The core temperature sensor 1 then corresponds functionally to a multipoint core temperature sensor using only the NTC resistors NTC1a to NTC1d.

[0070] The grill G2 has a cooking base 10, which can be heated, for example, by means of electrical heating elements, gas, etc., which has a receptacle 11 for accommodating the measuring tube 2 of the core temperature sensor 1. The receptacle 11 can exist, for example, in the form of a long hole, a blind hole or other guide. If the measuring tube 2 is inserted into the receptacle 11, in which the handle 3 can serve as a stop, the core temperature sensor 1 can measure the operating temperature of the heatable cooking base 10. If the core temperature sensor 1 is additionally connected to the grill G2 by means of the cable 7, the grill G2 can adjust the operating temperature to an operating temperature target value set on the grill G2. For this purpose, the grill has a control device 12, which can transmit the operating temperature target value to the core temperature sensor 1 as a temperature target value Tsoll. Since the operating temperature target value is usually above 150°C, in particular above 180°C, and thus in the preferred temperature range VB2, which starts, for example, at 150°C, in this case the core temperature sensor 1 selects the relevant R / T curve RT2. The core temperature sensor 1 then corresponds functionally to a single-point temperature sensor using only the NTC resistor NTC2.

[0071] The two cooking devices G1 and G2 are thus configured for coupling with the same core temperature sensor 1, wherein the core temperature sensor 1 fulfils different functions, however, and for this uses the respective NTC resistor NTC2 or the components NTC1a to NTC1d thereof. In general, however, the core temperature sensor 1 can also selectively use a plurality of NTC resistors with different R / T curves for a specific function.

[0072] The core temperature setpoint can be determined in a programmed manner or on the user side by operating a device (here for example a rotary knob 13 or the like), for example directly as a temperature value or a corresponding setting, for example "on", "medium", "hot", "very hot", temperature level, etc.

[0073] Figure 4 A possible method flow for operating a core temperature sensor 1 or a cooking device G1 or G2 coupled thereto according to the application is shown.

[0074] In step S1 the temperature setpoint Tsoll is emitted by the cooking device G1 or G2 via the cable 7, and in step S2 the temperature setpoint is received by the core temperature sensor 1, in particular by its microprocessor 6, via the cable 7.

[0075] In step S3 the relevant R / T characteristic in the form of an R / T curve RT1 or RT2 is selected by the microprocessor 6 depending on the temperature setpoint Tsoll using predetermined criteria, for example in agreement with the preferred temperature range VB1, VB2.

[0076] In step S4 the current resistance value R(t) of at least one NTC resistor NTC or NTC1a to NTC1d or NTC2 belonging to the selected R / T curve RT1 or RT2 is determined, for example by the measurement converter circuit 5.

[0077] In step S5 the temperature value T(t) is determined by the microprocessor 6 from the resistance value R(t) depending on the selected R / T curve RT1 or RT2, and in step S6 it is transmitted via the cable 7.

[0078] In step S7 the temperature value T(t) is received by the cooking device G1 or G2 via the cable 7 and for example used for monitoring the achievement of the core temperature or for regulating the operating temperature.

[0079] Steps S1 to S7 or S3 to S7 can be repeated at regular intervals.

[0080] Of course, the application is not limited to the embodiments shown.

[0081] Instead of R / T curves, Steinhart-Hart or Beta coefficients can also be stored and the current temperature value T(t) can be calculated by means of the Steinhart-Hart or Beta formula.

[0082] More than two R / T curves can also be used, which have more than two different NTC resistors or components thereof.

[0083] Generally, "a" or "an" can mean one or more, unless the context clearly indicates otherwise, e.g. when used in the context of "at least one" or "one or more".

[0084] A numerical designation can also just include the designated number and a usual tolerance range, unless this is explicitly excluded.

[0085] List of reference signs

[0086] 1 core temperature sensor

[0087] 2 measuring tube

[0088] 3 handle

[0089] 4 selection circuit

[0090] 5 measuring transducer circuit

[0091] 6 microprocessor

[0092] 6a data memory

[0093] 7 cable

[0094] 8 cooking space

[0095] 9 control device

[0096] 10 heatable cooking base

[0097] 11 receptacle

[0098] 12 control device

[0099] 13 knob

[0100] ADC A / D converter

[0101] C capacitor

[0102] G1 cooking apparatus / oven

[0103] G2 cooking apparatus / grill

[0104] NTC NTC resistor

[0105] NTC1a-NTC1d NTC resistor with R / T curve RT1

[0106] NTC2 NTC resistor with R / T curve RT2

[0107] R(t) current resistance value

[0108] Rref ohmic resistance

[0109] RT1 R / T curve

[0110] RT2 R / T curve

[0111] S1-S7 method steps

[0112] T(t) current temperature value

[0113] Tsoll temperature setpoint

[0114] VB1 preferred temperature range for R / T curve RT1

[0115] VB2 preferred temperature range for R / T curve RT2

[0116] Vcc operating voltage for A / D converter ADC

[0117] Vout intermediate tap.

Claims

1. A temperature measuring device comprising: a core temperature sensor (1), the core temperature sensor (1) having an elongated measuring tube (2), the measuring tube having a plurality of NTC resistors (NTC, NTC1a-NTC1d, NTC2), wherein at least two of the NTC resistors (NTC1a-NTC1d, NTC2) have mutually different R / T characteristics (RT1, RT2). The data processing device (6) can be used to access the different R / T characteristics (RT1, RT2) of the NTC resistors (NTC1a-NTC1d, NTC2) of the core temperature sensor (1). in, The temperature measuring device is configured for: Select the R / T characteristics (RT1, RT2) based on the predetermined temperature rating (Tsoll). Measure the resistance value (R(t)) of at least one NTC resistor (NTC1a-NTC1d, NTC2) belonging to the selected R / T characteristics (RT1, RT2), and The corresponding temperature value (T(t)) is determined based on the resistance value (R(t)) and the relevant selected R / T characteristics (RT1, RT2).

2. The temperature measuring device according to claim 1, wherein the core temperature sensor (1) has at least one component, the component having a plurality of NTC resistors (NTC1a-NTC1d) having the same R / T characteristic (RT1) in each component, and an NTC resistor (NTC2) having a different R / T characteristic (RT2).

3. The temperature measuring device according to claim 1 or 2, wherein the core temperature sensor (1) has at least two components, each having a plurality of NTC resistors (NTC1a-NTC1d) with the same R / T characteristic (RT1) in each component.

4. The temperature measuring device according to claim 1 or 2, wherein at least one NTC resistor (NTC1a-NTC1d) having a first R / T characteristic (RT1) is configured to sense a temperature between 70°C and 100°C, and at least one NTC resistor (NTC2) having a second R / T characteristic (RT2) is configured to sense a temperature exceeding 150°C.

5. The temperature measuring device according to claim 1 or 2, wherein at least one NTC resistor (NTC1a-NTC1d) is a glass-encapsulated NTC resistor.

6. A cooking apparatus (G1, G2) having a control device (9, 12) for controlling the cooking operation of the cooking apparatus (G1, G2), wherein the cooking apparatus (G1, G2) is capable of being coupled to a temperature measuring device according to any one of claims 1 to 5, and is configured to transmit a temperature rating (Tsoll) to the temperature measuring device, and wherein the control device (9, 12) is configured to receive a temperature value (T(t)) from the temperature measuring device for controlling the cooking operation.

7. The cooking apparatus (G1, G2) according to claim 6, wherein the temperature rating (Tsoll) corresponds to a temperature rating (Tsoll) that can be set on the cooking apparatus (G1, G2) at the user side.

8. A set of devices comprising: - The temperature measuring device according to any one of claims 1 to 5, and in addition at least - A cooking apparatus (G1) according to any one of claims 6 to 7, said cooking apparatus having a cooking space (8), and - A cooking device (G2) according to any one of claims 6 to 7, the cooking device having a heatable cooking base (10) having a housing (11) for a measuring tube (2) for a core temperature sensor (1). in, - The cooking equipment (G1, G2) is designed for coupling with the same temperature measuring device. - A cooking appliance (G1) having a cooking space (8) is configured to use a temperature value (T(t)) received by a temperature measuring device to monitor the core temperature of the food being cooked, and - A cooking appliance (G2) with a heatable cooking base (10) is set up to use a temperature value (T(t)) received by a core temperature sensor (1) to adjust the operating temperature of the heatable cooking base (10).

9. A method for operating a cooking apparatus according to any one of claims 6 to 7 together with a temperature measuring device according to any one of claims 1 to 5, wherein - The temperature rating (Tsoll) is transferred from the cooking equipment (G1, G2) to the temperature measuring device (S1, S2), and Temperature measuring equipment - Select the relevant R / T characteristics (RT1, RT2) based on the temperature rating (Tsoll) (S3). - Sensing (S4) the resistance value (R(t)) of at least one NTC resistor (NTC, NTC1a-NTC1d, NTC2) belonging to the selected R / T characteristics (RT1, RT2). - Based on the relevant R / T characteristics (RT1, RT2), determine (S5) the corresponding temperature value (T(t)) from the resistance value (R(t)), and - Transmit the temperature value (T(t)) (S6, S7) to the cooking equipment (G1, G2).

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