DE102017214753A1 - Household cooking appliance - Google Patents

Abstract

A household cooking appliance (1) has a cooking chamber (2), a data connection device (3) for establishing a data connection with a core temperature sensor (KTF) and a control device (4), wherein the control device is adapted to the household cooking appliance based on To control temperature readings of the core temperature sensor to calculate a cooking time (D, D ₁ , D ₂ ) of food (G) based on the temperature readings and display the calculated cooking time (D, D _1, D ₂ ) and / or a calculated remaining cooking time. The control means is arranged to calculate the cooking duration assuming a proportional increase of a core temperature (θ) of the cooking product (G) with a first-order delay and taking into account a dead time. A system includes a home cooking appliance and at least one core temperature probe. A method is used to determine a cooking duration and / or cooking time of cooking product, in which the cooking duration and / or remaining cooking time is calculated assuming a proportional increase of a core temperature of the food with a first order delay and taking into account a dead time. The invention is particularly advantageously applicable to ovens.

Description

The invention relates to a household cooking appliance comprising a cooking chamber, a data connection device for establishing a data connection with a core temperature sensor and a control device which is adapted to control the household cooking appliance based on temperature measurements of the core temperature sensor, an estimated cooking time of food to be cooked The core temperature probe is plugged in, based on temperature readings of the core temperature probe, to calculate the calculated expected cooking time and / or a calculated estimated cooking time. The invention also relates to a system having such a household cooking appliance and having at least one core temperature sensor connectable to the data connection device. The invention also relates to a method for determining an expected cooking duration and / or cooking time of cooking product. The invention is particularly advantageously applicable to ovens.

DE 10 2007 040 316 A1 discloses a method for displaying a Restgarzeit during a cooking process in a cooking appliance with a closable by a door cooking chamber, a heater, a display device, an operating device, a memory device, a control or regulating device and at least one sensing device, said at least one target -Gargutgröße and / or target cooking size can be adjusted, depending on the Restgarzeit is determined to be displayed on the display device, wherein in a first phase of the cooking process as a function of at least one set desired cooking size and / or target Estimated maximum and / or minimum value of the remaining cooking time is displayed, and in at least one further phase of the cooking process depending on a comparison between stored in the memory device values and at least one detected via the sensing device value est a Gargutgröße and / or Gargröße certain Restgarzeit is displayed.

DE 42 17 943 A1 discloses an oven or microwave oven with a temperature probe for detecting the temperature of the food to be cooked and a control and monitoring circuit for controlling the heating energy according to a cooking program and for switching off the heating energy upon reaching a user set Endkerntemperatur. The user should be provided with such an oven information about the remaining period available. Serves for this purpose a display device, which in the operating mode temperature-controlled cooking, the calculated by a computer circuit in response to measured during the cooking core temperature values remaining cooking time or the time at which the Endkerntemperatur is reached indicates.

WO 2008/061634 A1 discloses a method for determining a remaining time until the end of a cooking process of a food. First, a target temperature value is defined for a core of the food. Next, the actual core temperatures in the core of the food are measured at predetermined times and a time dependence of the actual core temperature is determined. The time dependence of the actual temperature is then compared with the desired temperature value and estimated from this a residual maturity of the cooking process. WO 2008/061634 A1 further relates to a corresponding device for determining the remaining time to an end of a cooking process.

It is the object of the present invention to overcome the disadvantages of the prior art, at least in part, and in particular to provide, by simple means, a possibility for the particularly early and accurate determination of a cooking time with a core temperature sensor.

This object is achieved according to the features of the independent claims. Advantageous embodiments are the subject of the dependent claims, the description and the drawings.

The object is achieved by a household cooking appliance, comprising a cooking chamber, a data connection device at least for establishing a data connection with a core temperature sensor and a control device. The controller is configured to control the household cooking appliance based on temperature readings of the core temperature probe, to calculate an expected cooking time of food to be cooked into which the core temperature probe is inserted based on temperature readings of the core temperature probe, and to display the calculated cooking time and / or a calculated remaining cooking time. The control device is also configured to calculate the cooking duration and / or the remaining cooking time assuming a proportional increase of a core temperature of the food with a first-order delay and taking into account a dead time.

This household cooking appliance has the advantage that with the progress of the cooking process, the forecast of the cooking time, remaining cooking time, etc. becomes more and more accurate. In addition, the cooking time, residual cooking time, etc. can be determined simply from the course of the core temperature. No comparison tables or reference curves are needed.

The household cooking appliance can be an oven. The oven can be a stand-alone oven or be a part of a combination device, such as a hearth. The oven can be an oven, a microwave oven and / or a steamer. For example, the oven may be an oven with microwave functionality and / or steam cooking functionality.

The cooking chamber is used for the treatment of food, e.g. for its heating or heating. If the cooking appliance is an oven, the cooking chamber can also be referred to as oven room.

The data connection device can be set up to establish a wired data connection and / or a wireless data connection. The data connection device may e.g. have a cable connection. The data connection device can also be set up to supply power to the core temperature sensor.

The control device is thus configured to receive measured (core) temperature measured values of the core temperature sensor at intervals by means of the core temperature sensor and to use it to control a cooking cycle of the cooking product.

The fact that the control device is set up to calculate the expected cooking duration of the cooking product may include that, alternatively or additionally, at least one time variable derived from the cooking time is calculated, e.g. the expected remaining cooking time and / or end of cooking time. In particular, the cooking time and the remaining cooking time differ only by a linear term and can therefore be easily converted into each other. Thus, the remaining cooking time can be determined as the difference between the calculated cooking time and the cooking time previously passed.

The time variables, in particular the cooking duration and the remaining cooking time, can also be used synonymously in the following, unless something else is specifically meant.

The setting up of the control device can comprise a corresponding programming of the control device.

The proportional increase of the core temperature of the food with a first-order delay, taking into account a dead time, is analogous to a temporal behavior of a PT1 element with deadtime element known from control technology.

zu berechnen, wobei D die voraussichtliche Gardauer, t eine aktuelle Zeit seit Beginn des Garablaufs, t₁ ein gewählter („Referenz-“) Zeitpunkt für die Berechnung der voraussichtlichen Gardauer D, ϑ(t) eine aktuelle Kerntemperatur, ϑ₁ die Kerntemperatur zum Referenzzeitpunkt t₁, ϑ_Ende eine „asymptotische“ Kerntemperatur in einem Endzustand des Garguts nach langer Zeit und ϑ_soll eine Solltemperatur des Garguts ist. Eine solche Berechnung der Gardauer D ist besonders einfach durchführbar und benötigt im einfachsten Fall nur die aktuelle Garzeit t die aktuelle Kerntemperatur ϑ(t) als Variablen.It is an embodiment that the control device is adapted to the estimated cooking time proportional to a first term MT according to Eq. (1): $$D~MT={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\left(t-t_1\right)\cdot \frac{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-{\theta }_{SOll}}\right)}{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-{\theta }_{\left(t\right)}}\right)}$$

where D is the estimated cooking time, t is a current time since the start of the cooking cycle, t _{1 is} a selected ("reference") time for calculating the expected cooking time D , θ (t) is a current core temperature, θ _{1 is} the core temperature at reference time t ₁ , θ _{end is} an "asymptotic" core temperature in a final state of the food after a long time, and θ _{soll is} a target temperature of the food. Such a calculation of the cooking time D is particularly easy to perform and needed in the simplest case, only the current cooking time t the current core temperature θ (t) as variables.

The reference time t ₁ is in particular automatically selected or set by the household cooking appliance.

The asymptotic core temperature θ _end corresponds to a final value of the core temperature θ (t), which theoretically approaches the core temperature θ _end as its limit asymptotically.

verläuft, was einem Verlauf einer Sprungantwort eines PT1-Gliedes mit Totzeit sehr nahe kommt. Dabei sind T_te eine Totzeit und T_e eine Zeitkonstante. Dies lässt sich gemäß Gl. (3) umstellen zu $$D=T_{te}-T_e\cdot ln\left(1-\frac{{\vartheta }_{Soll}}{{\vartheta }_{Ende}}\right),$$

wenn mit Erreichen der Solltemperatur des Garguts ϑ(t) = ϑ_Soll und t = D gilt.The relationship according to Eq. (1) can be derived by assuming that the increase of the core temperature θ (t) in a cooking chamber according to Eq. (2): $$\theta \left(t\right)=\left(1-e^{-\frac{t-T_{Tze}}{Tle}}\right)\cdot {\theta }_{ende}$$

runs, which comes very close to the course of a step response of a PT1 element with dead time. T _{te is} a dead time and T _{e is} a time constant. This can be done according to Eq. (3) change to $$D=T_{te}-T_e\cdot ln\left(1-\frac{{\theta }_{SOll}}{{\theta }_{ende}}\right).$$

when upon reaching the target temperature of the food θ (t) = θ _Soll and t = D applies.

während sich die Totzeit T_te gemäß Gl. (5) ausdrücken lässt als $$T_{te}=T_e\cdot ln\left[1-\frac{{\vartheta }_1}{{\vartheta }_{Ende}}\right]+t_1.$$

The time constant T _e can be calculated according to Eq. (4) express as $$T_e=\frac{t-t_1}{ln\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-\theta \left(t\right)}}.$$

while the dead time T _te according to Eq. (5) express as $$T_{te}=T_e\cdot ln\left[1-\frac{{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}}\right]+{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1,$$

The time constant T _e and the dead time T _te can be determined continuously for each measurement time. The summary of Eq. (3) to (5) gives Eq. (1).

berechnet wird, also D = MT gilt.It is a training that the anticipated Gardauer D according to Eq. (6): $$D=MT={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\left(t-t_1\right)\cdot \frac{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-{\theta }_{SOll}}\right)}{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-\theta \left(t\right)}\right)}$$

is calculated, so D = MT holds.

zu berechnen, wobei A ein wählbarer oder vorgegebener Parameter ist. Diese Ausgestaltung ergibt den Vorteil, dass mittels des Korrekturfaktors CR (t) nach Gl. (8): $$CR\left(t\right)=1-e^{-\frac{t}{A}}$$

anfänglich zu große Prognosewerte der voraussichtlichen Gardauer korrigierbar sind. Anfänglich große Prognosewerte der voraussichtlichen Gardauer D werden reduziert, während spätere Prognosewerte nicht oder nicht merklich verändert werden. Der Parameter A gibt dabei an, zu welchem Zeitpunkt der Korrekturfaktor CR den Wert nach Gl. (9): $$CR\left(A\right)=1-e^{-1}=\mathrm{0,632}$$

annimmt.It is yet another embodiment that the control device is set up to calculate the anticipated cooking duration proportionally to the first term MT and a second term (correction factor). CR according to Eq. (7): $$D~MT\cdot CR={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\left(t-t_1\right)\cdot \frac{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-{\theta }_{SOll}}\right)}{ln\left(\frac{{\theta }_{ende}-{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1}{{\theta }_{ende}-{\theta }_{\left(t\right)}}\right)}\cdot \left(1-e^{-\frac{t}{A}}\right)$$

to calculate, where A is a selectable or predetermined parameter. This embodiment provides the advantage that by means of the correction factor CR (t) according to Eq. (8th): $$CR\left(t\right)=1-e^{-\frac{t}{A}}$$

initially too large forecast values of the expected cooking time are correctable. Initially, large forecast values of the expected cooking time D are reduced while later forecast values are not or not significantly changed. The parameter A indicates at what time the correction factor CR the value according to Eq. (9): $$CR\left(A\right)=1-e^{-1}=0.632$$

accepts.

It is a development that the parameter A is dependent on the target core temperature θ _target , ie A = A (θ _target ) applies, advantageously high target core temperatures θ _target a large value of A and small target core temperatures θ _Soll a small value of A result. The dependence of A on the target core temperature θ _target can be stored, for example, in the form of corresponding characteristic curves, tables, etc. in the household cooking appliance. The parameter A may additionally or alternatively be dependent on a selected cooking program and / or food and be set automatically by the control device.

gewählt wird, wobei Δt einer fest vorgegebenen Zeitdauer („Zeitfenster“) entspricht, z.B. 1 min, 2 min, 5 min usw. Die Abstandszeitdauer ist grundsätzlich beliebig. Sie kann während eines Garablaufs konstant gehalten oder variiert werden. Wird der Referenzzeitpunkt t₁ gemäß Gl. (10) gewählt, gehen in die Gardauer D die aktuelle Garzeit t, die aktuelle Kerntemperatur ϑ(t), der Referenzzeitpunkt t1 und die vor Δt gemessene Kerntemperatur ϑ₁ ein. Die Gardauer D kann z.B. in Abständen von Δt berechnet werden. Der Referenzzeitpunkt t1 bewegt sich dabei mit, d.h., dass mit jeder zeitlich versetzten Berechnung ein neuer Wert von t1 verwendet wird. Das Zeitfenster Δt bleibt also gleich groß und wandert mit t mit.It is a further embodiment that the reference time t _1, for the calculation of the cooking time D is needed, according to Eq. (10) $${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=t-\mathrm{\Delta }t$$

is selected, wherein .DELTA.t corresponds to a fixed predetermined period of time ("time window"), for example, 1 min, 2 min, 5 min, etc. The interval period is basically arbitrary. It can be kept constant or varied during a cooking cycle. If the reference time t ₁ according to Eq. (10), go into the cooking time D the current cooking time t , the current core temperature θ (t), the reference time t1 and the core temperature θ ₁ measured before Δt. The cooking time D can be calculated eg at intervals of Δt. The reference time t1 moves with it, ie, that with each staggered calculation a new value of t1 is used. The time window Δt thus remains the same size and moves with t.

The delay time period Δt may be dependent on the target core temperature θ _target . This can be stored, for example in the form of corresponding characteristics, tables, etc. in the household cooking appliance. The time window .DELTA.t can be dependent on a selected cooking program and / or food and be set automatically by the controller.

gewählt wird, wobei Δϑ einer fest vorgegebenen Temperaturdifferenz seit Beginn des Garvorgangs entspricht. Der Referenzzeitpunkt t₁ bleibt also für einen Garablauf konstant. Dadurch wird das Zeitfenster t₁ =t - Δt im Laufe des Garvorgangs linear mit t größer.It is yet another embodiment that the reference time t ₁ according to Eq. (11) $${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DE102017214753A1\_0018.png,DE102017214753A1\_0019.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=t_1\left(\mathrm{\Delta }\theta \right)$$

is selected, wherein Δθ corresponds to a fixed predetermined temperature difference since the beginning of the cooking process. The reference time t ₁ thus remains constant for a cooking cycle. As a result, the time window t ₁ = t - Δt increases linearly with t in the course of the cooking process.

The temperature difference Δθ may be, for example, a few Kelvin, e.g. 3 K. The temperature difference Δθ may be dependent on a selected cooking program and / or food and automatically adjusted by the control device.

It is further an embodiment that the final value θ _{end of} the core temperature is set to 100 ° C and θ _end = 100 ° C applies. This can further simplify a calculation. In this embodiment, the assumption is made that when the core temperature θ in a food 100 ° C is reached, there is no more water (which in the presence by evaporation keeps the temperature below 100 ° C) and the food at the latest then even would have to be.

bestimmt wird, wobei T_Soll der von einem Nutzer eingestellten Solltemperatur des Garraums entspricht. Dies ergibt den Vorteil, dass auch Niedrigtemperatur-Garvorgänge mit hoher Genauigkeit berücksichtigt werden können.It is also an embodiment that the final value θ _{end of} the core temperature according to Eq. (12) $${\theta }_{\text{The End}}=\text{min}\left(100°{\text{C; T}}_{\text{Should}}\right)$$

is determined, wherein T _Soll corresponds to the set by a user set temperature of the cooking chamber. This has the advantage that even low-temperature cooking processes can be taken into account with high accuracy.

It is also an embodiment that the control device is set up to suppress or not to display an indication of the expected cooking duration and / or the expected remaining cooking time, if, for example, according to Eq. (4) determinable time constant T _e <0 applies. This has the advantage that at the beginning of the cooking cycle, in which T _e can assume negative values, no negative cooking time is displayed. Because initially, it may happen that the course of the core temperature of the step response of a PT1 element is not sufficiently similar. In other words, by checking whether T _e <0, a plausibility condition can be introduced which gives an indication as to whether the actual course of the core temperature can be meaningfully described by the functional approximation described above.

It is also an embodiment that the control device is set up to calculate the expected cooking duration and / or the expected remaining cooking time based on temperature measured values of a plurality of temperature sensors of the core temperature sensor.

It is a training that out of the Gardauer D an estimated remaining time RD according to Eq. (13) is calculated as RD = D - t.

The object is also achieved by a system comprising a household cooking appliance as described above and at least one connectable with the data connection device core temperature probe. The system can be designed analogously to the household cooking appliance and has the same advantages.

The object is also achieved by a method for determining an anticipated cooking duration and / or cooking time in which the expected cooking duration and / or remaining cooking time is calculated assuming a proportional increase of a core temperature of the food with a first order delay and taking into account a dead time , The method can be made analogous to the household cooking appliance and to the system and has the same advantages.

• 1 zeigt als Schnittdarstellung in Seitenansicht ein erfindungsgemäßes Haushalts-Gargerät;
• 2 zeigt eine Auftragung einer Kerntemperatur in °C gegen eine Zeit in Minuten für einen gemessenen zeitlichen Verlauf der Kerntemperatur und einen nach Gl. (2) berechneten Näherungsverlauf;
• 3 zeigt als Auftragung einer Gardauer in Minuten gegen eine Zeit in Minuten für zwei Varianten zur Berechnung der Gardauer im Vergleich zu einer wahren Gardauer;
• 4 zeigt einen Zeitverlauf über eine Zeit in Minuten eines beispielhaften Korrekturfaktors CR nach Gl. (8).

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in conjunction with the drawings.

• 1 shows a sectional side view of an inventive household cooking appliance;
• 2 shows a plot of a core temperature in ° C against a time in minutes for a measured time course of the core temperature and one according to Eq. (2) calculated approximation course;
• 3 shows as a plot of a cooking time in minutes against a time in minutes for two variants to calculate the cooking time compared to a true cooking time;
• 4 shows a time course over a time in minutes of an exemplary correction factor CR according to Eq. (8th).

1 shows a sectional side view of an inventive household cooking appliance in the form of a baking oven 1 , The oven 1 has a cooking space 2 , a data connection device 3 at least for establishing a data connection with a core temperature probe KTF and a controller 4 on. The data connection device 3 For example, a connector element for inserting a cable K of the core temperature probe KTF be.

The core temperature probe KTF can over the cable K (Core) temperature readings on the oven 1 transferred, in particular to the with the data connection device 3 connected control device 4 , The oven 1 can the core temperature probe KTF optional via the cable K supply electricity. The core temperature probe KTF can have one or more temperature sensors.

The control device 4 is set up the oven 1 based on the temperature readings of the core temperature probe KTF to control as indicated by the broad arrow, eg heating elements for heating the cooking chamber 2 to activate accordingly.

The control device 4 is also set up to have an expected cooking time and / or an expected remaining cooking time of food G , in which the core temperature probe KTF as indicated, based on that of the core temperature probe KTF sensed temperature readings. More specifically, the controller is 4 set to the expected cooking time, assuming a proportional increase of a core temperature of the food G with a delay of first order and taking into account a dead time to calculate.

The control device 4 is also set up to display at least calculated estimated remaining cooking time, eg on a display device (not shown) of a control panel 5 , The display device may be, for example, a segment display or a screen. When preparing food G with the core temperature probe KTF the user can set a target core temperature θ _target on the control panel 5 to adjust. Once the food G this target core temperature θ _{target has been} reached, the cooking process by the controller 4 completed.

2 shows as a plot of a core temperature θ in ° C versus time t in minutes for a measured time course L1 the core temperature θ (t) and one according to Eq. (2) calculated, idealized approximation L2 , The cooking process is started at a time t = 0. The measured time course L1 the core temperature θ (t) has a shape in an initial - here: to about t ₁ = 30 min lasting - section, which does not make sense by Eq. (2) is approachable. The reason for this is the amount of time it takes to heat from a surface of the food G to penetrate to its core. Without preheating, more time is needed to warm up the cooking chamber. From time t ₁ , the assumption according to Eq. (2) but good the actual course of the core temperature θ (t). Thus, the calculation of the estimated cooking time D be carried out from t ₁ particularly reliable and accurate. The core temperature θ (t) typically stays below 100 ° C for foods that are not completely dry (such as meat or fish).

3 shows a plot of a Gardauer D in minutes against a time t in minutes for two variants D ₁ . D ₂ for calculating the cooking time D compared to a "true", experimentally determined cooking time D _r , The true Gardauer D _r here is a little less than 50 minutes, about 48 minutes. The experimentally determined course of D ₁ corresponds to the choice of the first reference time t ₁ according to Eq. (10), while the experimentally determined course of D ₂ the choice of the constant reference time t ₁ according to Eq. (11) corresponds.

Initially, both provide cooking times D ₁ . D ₂ too long periods. Initially (starting at the reference time t ₁ = approx. 11 min) D1 significantly higher than D2 , from about t = 15 min but closer to the true Gardauer D _r , The forecasts according to the courses of D ₁ and D ₂ But more and more accurate and meet the true Gardauer D _r in the further course exactly.

Generally, the cooking time D also be calculated by means of an alternating use of both determinations of the reference time t ₁ . This can be done, for example, by: D ₂ is used until D ₁ <D ₂ , then only D ₁ , Alternatively, D for both variants according to Eq. (10) and Eq. (11) and the displayed value is the smallest value of both variants.

4 shows a time course over a time in minutes of an exemplary correction factor CR according to Eq. (8th). The correction factor CR is initially zero and then asymptotically approaches unity.

Of course, the present invention is not limited to the embodiment shown.

Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., unless this is explicitly excluded, e.g. by the expression "exactly one", etc.

Also, a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

LIST OF REFERENCE NUMBERS

1

oven

2

oven

3

Data link

4

control device

5

control panel

K

electric wire

CR

correction factor

D

cooking time

D _r

True cooking time

D ₁

Course of a calculated cooking time according to a first variant

D ₂

Course of a calculated cooking time according to a second variant

L1

Time course of the core temperature

L2

Proximity curve of the core temperature

G

be cooked

KTF

Core probe

t

Time since the start of cooking

t1

Reference time

θ

core temperature

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 102007040316 A1 [0002]
• DE 4217943 A1 [0003]
• WO 2008/061634 A1 [0004]

Claims (11)

A household cooking appliance (1) comprising a cooking chamber (2), a data connection device (3) for establishing a data connection with a core temperature sensor (KTF) and a control device (4) arranged to - based on the household cooking appliance (1) to control the temperature readings of the core temperature sensor (KTF), - to calculate a cooking duration (D, D _1, D ₂ ) of the food to be cooked (G) based on the temperature readings, and - the calculated cooking time (D, D _1, D ₂ ) and / or to indicate a calculated residual cooking time, characterized in that - the control device (4) is adapted to set the cooking duration (D, D _1, D ₂ ) assuming a proportional increase of a core temperature (θ) of the cooking product (G) with a first order delay and to calculate taking into account a dead time. Household cooking appliance (1) after Claim 1 , characterized in that the control device (4) is adapted to the cooking duration (D, D _1, D ₂ ) in proportion to a first term according to $$D~MT=t_1+\left(t-t_1\right)\cdot \frac{ln\left(\frac{{\theta }_{ende}-{\theta }_1}{{\theta }_{ende}-{\theta }_{SOll}}\right)}{ln\left(\frac{{\theta }_{ende}-{\theta }_1}{{\theta }_{ende}-{\theta }_{\left(t\right)}}\right)}$$

where D is the estimated cooking time, t is a current time since the start of the cooking cycle, t _{1 is} a reference time of calculating the expected cooking time, θ (t) is a current core temperature, θ _{1 is} the core temperature at reference time t _1, θ _{end is} an asymptotic "Core temperature in a final state of the food and θ _{Target is} a desired temperature of the food. Household cooking appliance (1) after Claim 2 , characterized in that the control device (4) is adapted to the cooking duration (D, D _1, D ₂ ) in proportion to the first term and a second term (CR) according to $$D~MT\cdot CR=t_1+\left(t-t_1\right)\cdot \frac{ln\left(\frac{{\theta }_{ende}-{\theta }_1}{{\theta }_{ende}-{\theta }_{SOll}}\right)}{ln\left(\frac{{\theta }_{ende}-{\theta }_1}{{\theta }_{ende}-{\theta }_{\left(t\right)}}\right)}\cdot e^{-\frac{t}{A}}$$

to calculate, where A is a selectable parameter. Household cooking appliance (1) after one of Claims 2 to 3 , characterized in that the reference time (t ₁ ) $$t_1=t-\mathrm{\Delta }t$$

is, where .DELTA.t corresponds to a fixed predetermined period of time. Household cooking appliance (1) after one of Claims 2 to 3 , characterized in that the reference time (t ₁ ) $$t_1=t_1\left(\mathrm{\Delta }\theta \right)$$

is, wherein Δθ corresponds to a fixed predetermined temperature difference since the beginning of the cooking process. Household cooking appliance (1) after one of Claims 2 to 5 , characterized in that θ _end = 100 ° C applies. Household cooking appliance (1) after one of Claims 2 to 5 , characterized in that θ _end = Min (100 ° C; T _target ) with T _target a set temperature of the cooking chamber (2) applies. Domestic cooking appliance (1) according to one of the preceding claims, characterized in that the control device (4) is adapted to suppress an indication of the expected cooking duration (D, D _1, D ₂ ) and / or the expected remaining cooking time, if for a time constant $$T_e=\frac{t-t_1}{ln\frac{{\theta }_{ende}-{\theta }_1}{{\theta }_{ende}-\theta \left(t\right)}}<0$$

applies. Domestic cooking appliance (1) according to one of the preceding claims, characterized in that the control device (4) is adapted to the expected cooking time (D, D _1, D ₂ ) and / or the expected remaining cooking time based on temperature readings of a plurality of temperature sensors of the core temperature sensor (KTF). System (1, KTF), comprising a household cooking appliance (1) according to any one of the preceding claims and at least one connectable to the data connection means (3) core temperature sensor (KTF). Method for determining an anticipated cooking duration (D, D _1, D ₂ ) and / or remaining cooking time of the food to be cooked (G), in which the cooking duration (D, D _1, D ₂ ) and / or remaining cooking time is assumed assuming a cooking time proportional increase of a core temperature (θ) of the food (G) is calculated with a first-order delay and taking into account a dead time.

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