EP1800065A1 - Method for controlling a cooking process in a cooking device - Google Patents
Method for controlling a cooking process in a cooking deviceInfo
- Publication number
- EP1800065A1 EP1800065A1 EP05800651A EP05800651A EP1800065A1 EP 1800065 A1 EP1800065 A1 EP 1800065A1 EP 05800651 A EP05800651 A EP 05800651A EP 05800651 A EP05800651 A EP 05800651A EP 1800065 A1 EP1800065 A1 EP 1800065A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time
- cooking
- comparison
- sensor
- cooking process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2007—Removing cooking fumes from oven cavities
- F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
Definitions
- the invention relates to a method for controlling a cooking process in a cooking appliance.
- a generic method for controlling a cooking process in a cooking appliance from EP 0 074 764 B1 is known.
- the known method can be used for various food items.
- the output signal of a arranged in the oven gas sensor is evaluated at two different times at the beginning of the cooking process in an electric control of the cooking appliance, the type of food by means of the quotient formed from two sensor output signals is determined.
- the cooking process is terminated as soon as the sensor output signal has reached a value dependent on the type of food.
- a method for controlling a cooking process in a cooking appliance is known.
- the cooking appliance for example, a sensor designed as a humidity sensor, which is in signal transmission connection with an electrical control of the cooking appliance.
- the electrical control has a memory and an evaluation circuit, wherein in the memory a plurality of reference value quantities is stored, each of which parameter sets are assigned for the electrical control.
- a value set is generated from the gas concentration detected during the cooking process in the evaluation circuit, which corresponds to the time profile of a function dependent on the gas concentration from the start time t 0 to a current time t "during the cooking process.
- a comparison value element for the comparison at the time t n is generated from the reference value sets in each case, wherein the plurality of comparison value sets are compared with the value set.
- the set of values that is closest to the set of values is automatically selected by means of the evaluation circuit and the set of parameters assigned to this set of comparisons is transformed to the time t n via a calculation rule. In this way, the cooking process is controlled by means of the electrical control until the end of the cooking time.
- BESTATI Q UNGSKOPIE User of one of the stored baking mixes and thus a reference value set whose associated parameters are taken over by the controller for the cooking process. If, during the cooking process controlled in this way, deviations occur between the values detected by the gas sensor and the reference values, the baking process is changed or stopped.
- US 5,681,496 A discloses another method for controlling a cooking process using a humidity sensor. Similar to the method known from DE 103 0 465 A1, the comparison between a measured set of values and a multiplicity of stored comparison value quantities is again performed only once. The parameters determined above are determined for the further cooking process, which is regulated after the comparison, independently of the further development of the moisture in the cooking chamber.
- the invention thus raises the problem of providing a method for controlling a cooking process, which is also applicable to a variety of very similar in kind cooking goods with different cooking times.
- the achievable with the present invention consist in particular in the provision of a method for controlling a cooking process, which is applicable to a variety of very similar cooking goods with different cooking times.
- DE 196 09 116 A1 is determined for determining the Garendezeitticians determined during a current cooking process course of 5 core temperature in a larger piece of meat stored in a memory of an electrical control temperature curves.
- a particularly advantageous embodiment of the method according to the invention provides that in the comparison, the determination of the similarity of a comparison value set with the associated end time t z to the set of values as a function of the difference between iö the time t n and the respective end time t z occurs.
- the quality in the selection of the most similar comparison value sets is improved since it is assumed that the farther the end time t z of the respective comparison value set or reference value set from the current time t n is removed, the comparison value set of the current value set is increasingly dissimilar.
- Value set corresponds to the time course of the first derivative of the oxygen concentration after the time.
- the oxygen concentration is changed characteristically by the vapor during each cooking process.
- a further advantageous refinement provides that an oxidizable gas is detected by the sensor at least 5 concentration. In this way, the use of low-cost semiconductor sensors is possible.
- a particularly advantageous further development of the teaching according to the invention provides that the sensor detects the concentrations of at least two different gases and each reference value quantity stored in the memory has in each case as many partial value quantities 0 as gases have been detected. This further improves the quality of the results in the comparisons according to the invention.
- the selectivity between similar and not similar comparison value quantities in the comparison with the value set is increased because not only a single gas or its concentration is used for the comparison, but a plurality of gases or concentrations.
- the comparison is so multidimensional and includes as many partial comparisons as gases or gas concentrations are detected and are stored for the data in each reference value set.
- the predetermined response of the electrical control to the comparison can be selected according to type and scope within wide suitable limits.
- the residual cooking time is / are displayed on a display of the cooking appliance by means of the generated parameter set and / or the heating source for heating the cooking space is automatically switched off and / or an acoustic cooking signal is triggered.
- a particularly advantageous embodiment of the teaching according to the invention provides that by means of the generated parameter set the type of food in the current cooking process is determined lo and the mode and the cooking chamber temperature for the cooking process are selected and / or displayed. In this way, a largely automated cooking process is possible.
- the Stahlßignal the sensor is processed in the evaluation circuit only after a predetermined time delay after the i 5 starting time to.
- the quality of the comparison is further improved because, after a lead time, the value set for the comparison is larger and therefore more meaningful.
- FIG. 1 shows a front view of a cooking appliance with a cooking chamber
- FIG. 2 is a side view of the cooking appliance of FIG. 1 in partially cut
- FIG. 3 shows a side view of another cooking appliance analogous to FIG. 2,
- FIG. 4 shows exemplary gas concentration-time profiles at a time t n .
- FIG. 5 shows exemplary gas concentration-time profiles at a time t n + 1 .
- FIG. 6 shows another exemplary gas concentration-time profile
- Figure 7 further exemplary gas concentration time-course, not normalized and FIG. 8 shows the gas concentration-time profiles from FIG. 7, twice normalized.
- Fig. 1 a designed as an oven cooking device is shown.
- the cooking appliance has a cooking chamber 4 closable by a door 2 with a viewing window 6 and a control panel 8, wherein a display 10 and two control knobs 12 are arranged on the control panel 8.
- Fig. 2 shows the cooking appliance of Fig. 1 in a partially sectioned side view.
- the cooking chamber 4 designed as a carbon dioxide sensor sensor 14 for detecting the carbon dioxide concentration in the cooking chamber 4 is arranged and a parked on a food support food 16 is inserted.
- the cooking appliance has an electrical control 18 which contains an evaluation circuit with a timer and a memory and is in signal transmission connection with the carbon dioxide sensor 14 and a heating source 20 designed as a resistance heating for heating the cooking chamber 4.
- the vapor is discharged from the cooking chamber 4 in a manner known to those skilled in the art via a catalyst 22 and a vapor channel 24. This is symbolized in FIG. 2 by arrows 26.
- a current gas concentration is detected by the sensor 14, since the gases resulting from the cooking process are continuously removed from the cooking chamber 4. There is no concentration of these gases in the cooking chamber. 4
- the inventive method is not limited to cooking appliances with catalyst 22, but the cooking appliance for carrying out the method according to the invention can be optionally equipped with or without catalyst 22, wherein the catalyst 22 is arranged on the specialist in known manner on or in the vapor channel 24.
- the carbon dioxide concentration As an alternative to the carbon dioxide concentration, other gas concentrations known to the person skilled in the art and suitable for the process according to the invention, such as, for example, the oxygen concentration, can also be used.
- a cooking appliance with a catalyst 22 it is basically advantageous to arrange the then formed as an oxygen sensor sensor 1-4 in the flow direction after the catalyst 22, since in this way the to the Evaluation circuit forwarded output signal of the sensor 14 is amplified. See Fig. 3. This is because the gas molecules escaping from the feed 16 and oxidizable by the action of the catalyst 22 oxidize, thus increasing the number of gas molecules displacing the oxygen after the catalyst 22. This oxygen is consumed. So if an oxygen sensor is used as a sensor 14, so is the Oxygen concentration is reduced to a greater extent than when installed in the flow direction before the catalyst.
- sensors 14 which detect gases which are produced during the cooking process and are emitted by the feed 16, their output signal is likewise amplified due to the increase in the number of gas molecules. As a result, on the one hand, the evaluation of the output signal of the sensor 14 and thus the control of the cooking process is further improved. On the other hand, it is possible to use a less sensitive and therefore less expensive sensor 14. The same applies to the use of a humidity sensor.
- Embodiment to be made of carbon dioxide.
- the arrangement of the sensor 14 in the flow direction in front of the catalyst 22 shown in FIG. 2 is possible in all gases suitable for the process according to the invention.
- the food 16 is inserted into the cooking chamber 4 and the door 2 is closed. Will the
- Cooking process started by means of one of the control knob 12, so the heating source 20 is turned on, resulting in the course shown in Fig. 4.
- FIG. 4 shows exemplary gas concentration-time profiles, the course of the gas concentration detected by the sensor 14 during the current cooking process being shown as a solid line a.
- the dashed lines b and c represent by way of example two reference value quantities stored in the memory. In fact, a multiplicity of reference value quantities are stored in the memory, each time delay of a reference function from a start time t 0 to an end time t z of a reference cooking operation correspond and each of which parameter sets for the electrical control 18 are assigned. All curves a, b and c shown in FIG. 4 start at the start time to. The circular ring at the other end of the line a symbolizes the time t n of the currently running cooking process.
- the reference value set b corresponds to a reference function with a short cooking duration
- the reference value set c corresponds to a reference function with a long cooking time.
- the end time t z of the reference function represented by b has already expired.
- the carbon dioxide concentration increases in the Garraurn 4 after the start time to the cooking process to a maximum value and then decreases until it reaches the current time t n again.
- the time course of the carbon dioxide concentration of the currently running cooking process is detected in a manner known to those skilled in the art from the start time t 0 to the time t n and stored in the memory.
- the value set a generated in this way in the evaluation circuit of the electrical control 18 can not be directly compared with the stored reference value sets b and c at the time t n , since the reference value sets, as already explained, at least partially correspond to reference functions whose end time t z is not coincides with the time of the current comparison t n . Therefore, from the
- Reference value quantities b and c in the evaluation before the comparison respectively generates a comparison value set for the comparison at the time t n .
- the values of the reference value sets of reference functions with an end time t z become smaller than t n , that is, for example, from the reference value set b, by means of a calculation rule of t z until the time t n added to allow in this way a comparison with the set of values a.
- the calculation rule could be that the values of the reference value set b are set from the time t z to t n equal to the values of the value set a in this time interval.
- An alternative to this is to set the values of the reference value set b equal to 0 in this time interval.
- a further alternative provides that the values of the reference value set b in this time interval is set equal to the product of a number between 0 and 1 and the maximum value of the reference value set b in the time interval t 0 to t z .
- the last alternative thus represents a middle ground between the first and the second calculation rule.
- a corresponding comparison value set has been generated from the reference value set b, which can then be compared with the value set a in the evaluation circuit.
- sets of reference values of reference functions to an end time point t z is greater than t s, that is, for example, c from the set of reference values.
- the value set a is supplemented by means of a calculation rule from t n to the time t z .
- the reference value set does not necessarily have to be converted into a comparison value set.
- a fundamental transformation may still be useful, for example, to be able to perform the comparison at an earlier time during the current cooking process. This will be explained later in the text.
- the value set a in the evaluation circuit is compared with the multiplicity of reference value quantities assigned to the reference value quantities, for example b and c, in a manner known to the person skilled in the art.
- the three of the set of values at time 5 t n most similar comparison value quantities are now automatically selected by means of the evaluation circuit.
- the similarity is a comparative value quantity with the associated end time point t z to the value set in dependence on the difference between the time t n and t z Endezeitpunlct made.
- the distance between the end time t z iQ and the current comparison time t n itself is used for the comparison.
- Another possibility is to use the above-explained calculation rules for generating the comparison value quantities for this purpose.
- the reference value set b would be more similar to the set of values a than the reference value set c.
- both reference value quantities b and c in the i 5 initial phase of the current cooking process are approximately equal to the value set a, they differ very greatly by their end times t z . If, as stated above, the distance between the respective end times t 2 and the current comparison instant t n would be used for the comparison, the reference value set b would be more similar to the value set a at the current comparison time t n than the result
- a single set of parameters is generated via a predetermined calculation rule, which is used for the electrical control 18 until the next comparison at the time t n + 1 .
- the parameter set generated in this way contains at least the cooking end time for the currently running cooking process, which has been determined from the individual end times t z of the three parameter sets. This can be done, for example, by the formation of the arithmetic mean value from the end times t z of the selected reference value quantities or reference value quantities. Other mathematical methods known and suitable to those skilled in the art are also conceivable.
- the method according to the invention is repeated continuously during the currently running cooking process. It is automatically ended as soon as a cooking end time determined by means of the evaluation circuit and as a function of the comparisons made has been reached during the cooking process currently taking place.
- the parameter sets assigned to the individual reference value sets and thus the parameter set used for the control of the current cooking process can contain a multiplicity of suitable parameters.
- the display of the remaining cooking time on the display 10 of the cooking appliance and / or 5 the automatic switching off of the heating source 20 for heating the cooking chamber ⁇ 4 and / or an acoustic cooking signal is triggered by means of the parameter set generated in the manner explained above.
- a preferred embodiment of the method according to the invention provides that by means of the generated parameter set the type of feed 16 is determined during the current cooking process and the operating mode and the cooking space temperature for the cooking process are selected. For this purpose, it is necessary that the comparison according to the invention takes place already in the initial phase of the current cooking process. Up to this point in time, for example, an operating program of the cooking appliance identical for all dishes 16 or for individual groups of dishes 16 is used in order to produce a suitable set of values for the comparison.
- the output signal of the sensor 14 in the evaluation circuit is processed in accordance with the invention only after a predetermined lead time has elapsed after the start time to.
- disturbances in the output signal may be due to rapid heating, ie heating with the maximum heating power, or by switching on a circulating air fan, not shown.
- the result is local extreme values, ie local minimum and maximum values of the set of values. It can the Time duration for the lead time can be determined and determined for example by experiments.
- the lead time can be stored in the simplest case even in the memory.
- the duration of the lead time is determined only during the current cooking process.
- the end of the lead time can be determined as a function of the course of the gas concentration detected by the sensor 14.
- the sensor 14 easily detectable changes in the course of Gaskonze are ntration, such as extreme values or turning points.
- this plurality of gases in the electrical control 18th evaluate and use for the comparison according to the invention.
- a plurality of respectively multidimensional reference value sets would thus be compared with a multidimensional set of values at the comparison time t n in the manner explained above.
- the number of dimensions in the reference value quantities is identical to the number of dimensions in the value set and is equal to the number of gases detected by the sensor 14. Instead of dimensions one could also speak of subvaluations.
- the temperature cycle shown in Fig. 6 is repeated continuously throughout the duration of the current cooking process.
- the duration of a temperature cycle may be equal to the time interval between two consecutive comparison times t n and t n + 1 .
- the duration of a single temperature cycle is much shorter than the time interval between two successive comparison times t n and t n + i.
- measured values are recorded with the sensor 14 at mutually different times. In this case, the concentrations of mutually different gases are detected by the sensor 14 in at least two different time points in the present embodiment. In this way, an artificial curve, which is shown by way of example in FIG.
- the values of the curve e correspond to the concentrations of at least two different gases detected with the sensor 14 during the temperature cycle d. If, for example, four different gases were detected by the sensor 14, the concentration of each of the four gases would be detected by the sensor 14 alternately at the times of the measured value recording. From the individual values recorded in this way, a time profile would then be generated in the electrical control 18 in a manner known to the person skilled in the art. The further processing is as already explained. The A.number of dimensions or the partial value quantities of the value set generated thereby and the stored reference value quantities would be four in this case.
- This pre-selection can be effected, for example, by preselecting those whose maximum value or their first maximum value fall within a predetermined time interval by the time of the maximum value or of the first maximum value of the value set from the total quantity of reference value sets or comparison value sets.
- a supplementary or alternative possibility to reduce the amount of data to be processed in the electrical control unit 8 in the case of a large number of reference value sets is to normalize the value set before the comparison and compare it later with likewise standardized reference value sets. Basically, it is possible to simply normalize the set of values and the stored reference value sets. Conveniently, this is a two-fold normalization used, which is explained in more detail with reference to FIGS. 7 and 8.
- FIG. 7 shows by way of example a set of values f and a stored reference value quantity g generated from the detected carbon dioxide concentration during a current cooking process. The two curves are not normalized and each have a maximum value, f max and g max , on.
- FIG. 8 shows the set of values f and the reference value set g from FIG. 7 in a two-standard representation, wherein in this example the maximum value of the set of values f max and the time t max associated with this maximum value have been set to 1. For courses with several local maximum values, it is also possible to normalize to the temporally first maximum value and the time allocated to it. Other standardizations known to the person skilled in the art are also conceivable.
- a further advantageous development of the aforementioned embodiment provides that, in each case, a derivative according to time, for example the first derivative with respect to time, is generated from the curves of FIG. 7 before their normalization. This allows extremes and inflection points to be used for normalization to be generated at an even earlier point in time during the current cooking process. Thus, the evaluation in the electrical control 18 can be started earlier, as a result of which information from the cooking appliance to the user can be generated early on in an already explained manner.
- the teaching of the invention is not limited to the present embodiment.
- the plurality of most similar comparison value sets are freely selectable within appropriate limits and are not limited to a number of three.
- other computational rules known to the person skilled in the art for generating the comparative value sets and for carrying out the comparison as well as generating the parameter set used for the controller 18 up to the respectively next comparison are conceivable.
- the Ari of the sensor 14 and the thus detectable gas types can be selected within wide suitable limits. For example, the evaluation of the
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
- Cookers (AREA)
- Baking, Grill, Roasting (AREA)
- General Preparation And Processing Of Foods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004049927A DE102004049927A1 (en) | 2004-10-14 | 2004-10-14 | Method for controlling a cooking process in a cooking appliance |
PCT/EP2005/011080 WO2006042708A1 (en) | 2004-10-14 | 2005-10-14 | Method for controlling a cooking process in a cooking device |
Publications (2)
Publication Number | Publication Date |
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EP1800065A1 true EP1800065A1 (en) | 2007-06-27 |
EP1800065B1 EP1800065B1 (en) | 2008-01-02 |
Family
ID=35675451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05800651A Not-in-force EP1800065B1 (en) | 2004-10-14 | 2005-10-14 | Method for controlling a cooking process in a cooking device |
Country Status (5)
Country | Link |
---|---|
US (1) | US7923664B2 (en) |
EP (1) | EP1800065B1 (en) |
AT (1) | ATE382830T1 (en) |
DE (2) | DE102004049927A1 (en) |
WO (1) | WO2006042708A1 (en) |
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DE10300465A1 (en) * | 2003-01-09 | 2004-07-29 | Rational Ag | Cooking using a cluster analysis and cooking devices for this |
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2004
- 2004-10-14 DE DE102004049927A patent/DE102004049927A1/en not_active Ceased
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2005
- 2005-10-14 US US11/665,552 patent/US7923664B2/en not_active Expired - Fee Related
- 2005-10-14 AT AT05800651T patent/ATE382830T1/en not_active IP Right Cessation
- 2005-10-14 EP EP05800651A patent/EP1800065B1/en not_active Not-in-force
- 2005-10-14 DE DE502005002452T patent/DE502005002452D1/en active Active
- 2005-10-14 WO PCT/EP2005/011080 patent/WO2006042708A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
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See references of WO2006042708A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502005002452D1 (en) | 2008-02-14 |
ATE382830T1 (en) | 2008-01-15 |
US20070289962A1 (en) | 2007-12-20 |
WO2006042708A1 (en) | 2006-04-27 |
DE102004049927A1 (en) | 2006-04-27 |
US7923664B2 (en) | 2011-04-12 |
EP1800065B1 (en) | 2008-01-02 |
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