Method for performing a drying function after a cooking or steaming function

Description

[0001] The present invention relates to a method for performing a drying function after a cooking function, in particular after a steam cooking function. Further, the present invention relates to a cooking oven, in particular a cooking oven with at least one steam cooking function.

[0002] During a steam cooking process condensate is generated inside the oven cavity. Said condensate is annoying for the user and may by disadvantageous for the cooking process. After the cooking process the condensate must to be removed.

[0003] German patent application No. DE 10 2016 215647 A1 discloses a method for drying a cooking chamber according to the preamble of claim 1.

[0004] Japanese patent application No. JP 2017 026214 A discloses a cooker with a heating chamber with a control device which starts and turns off the heater for drying the cooking chamber. A humidity sensor being attached in an exhaust unit is described. A user selects whether or not to perform the drying mode operation and a humidity sensor which is attached in an exhaust unit is used to determine whether or not the drying is completed after the start of the drying mode operation.

[0005] It is an object of the present invention to provide a method for performing a drying function after a cooking function or steam cooking function, wherein said drying function is adapted to the remaining humidity in the oven cavity by minimum energy consumption.

[0006] The object is achieved by the method according to claim 1.

[0007] The main idea of the present invention is that the drying function is activated only if necessary, wherein the necessity is checked by using at least one parameter value. The drying function is immediately started, after the cooking function or steam cooking function has been finished. This allows an optimal adaption of the drying function to the requirements by minimum energy consumption. The method of the present invention is suitable for cooking ovens with and without steam functions. The method of the present invention may be also applied to cooking ovens with radiant heating, convection heat and even microwave heating functions.

[0008] For example, if the drying function is required, then the need of said drying function is indicated on a user interface and / or said drying function is started automatically. For example, the need of the drying function is indicated on the user interface by showing a pop-up interacting with the user. The drying function may be started or not by user interaction. The drying function could be started manually or automatically at the end of the cooking process, in particular at the end of the steam cooking process.

[0009] Further, the drying function may be finished either after a predetermined time or if the detected or calculated parameter value falls below a corresponding threshold parameter value.

[0010] According to the present invention, after the cooking function or steam cooking function a characteristic value is calculated by the formula Y SF t T = t ⋅ k 1 SF + T ⋅ k 2 SF , wherein SF is a selected cooking function or steam cooking function, t is the time said cooking function or steam cooking function was running, T is the temperature during the cooking function or steam cooking function, k1 and k2 are coefficients depending on the selected cooking function or steam cooking function. For example, if the cooking oven is a microwave oven, then the coefficient k1 depends on the power of said microwave oven. The weight of the selected cooking function SF or steam cooking function SF depends on the amount of steam and / or humidity generated for said function and / or on the condensation expected at the end of the cooking process. The amount of steam depends on the number of activations of the steam generator, on which heating elements are activated and / or on the food inserted into the oven cavity.

[0011] Then, the characteristic value is compared with a corresponding threshold characteristic value, wherein said threshold characteristic value is a function of the selected steam function SF, the time t said cooking function or steam cooking function was running and the temperature T during the cooking function or steam cooking function.

[0012] Particularly, the drying function is required and started manually or automatically, if the characteristic value exceeds the threshold characteristic value, and is finished, if the characteristic value falls below the threshold characteristic value.

[0013] For example, if the detected humidity exceeds a threshold humidity value, then the drying function is required and started manually or automatically.

[0014] Moreover, the humidity inside the oven cavity may be detected during the drying function, wherein said drying function is continued, if the detected humidity exceeds the threshold humidity value, while said drying function is finished, if the detected humidity falls below the threshold humidity value.

[0015] According to an embodiment of the present invention, an estimated run time t e for the drying function is calculated after the cooking function or steam cooking function by the formula t e = A ∫ B H t dt / k ,, wherein A is the start of the cooking function or steam cooking function, B is the end of the cooking function or steam cooking function and k is a humidity factor of the cooking function or steam cooking function.

[0016] Additionally, an adjusted estimated run time for the drying function may be calculated during the drying function by the formula t ′ e = t e − ∫ D H t dt / k ′ <mprescripts / > C <none / > , wherein C is the start of the drying function, D is the end of the drying function and k' is a drying factor of the drying function.

[0017] Further, the present invention relates to a cooking, in particular a cooking oven with at least one steam cooking function, wherein the cooking oven is provided for the method mentioned above.

[0018] Novel and inventive features of the present invention are set forth in the appended claims.

[0019] The present invention will be described in further detail with reference to the drawings, in which FIG 1illustrates a schematic flow chart diagram of a method for determining a condensation in an oven cavity according to a first embodiment of the present invention, FIG 2illustrates a schematic graphical representation of a characteristic value Y as function of a selected steam function SF, the time t and the temperature T according to the first embodiment of the present invention, FIG 3illustrates a schematic flow chart diagram of the method for determining the condensation in the oven cavity not according to the present invention, FIG 4illustrates a schematic flow chart diagram of the method for determining the condensation in the oven cavity not according to the present invention, and FIG 5illustrates a schematic diagram of the humidity inside the oven cavity as function of the time t during a steam cooking function and a drying function not according tothe present invention.

[0020] FIG 1 illustrates a schematic flow chart diagram of a method for determining a condensation in an oven cavity according to a first embodiment of the present invention.

[0021] In a first step 10 a steam cooking function is selected. In a next step 12 said steam cooking function is running. In a further step 14 the steam cooking function is ended either automatically by a timer or manually by a user.

[0022] In a step 16 a characteristic value Y is calculated by the formula Y SF t T = t ⋅ k 1 SF + T ⋅ k 2 SF , wherein SF is the selected steam function, t is the time said steam function was running, T is the temperature during the steam function, k1 and k2 are coefficients depending on the selected steam function. The coefficients k1 and k2 may be different or identical. For example, if the cooking oven is a microwave oven, then the coefficient k1 depends on the power of said microwave oven.

[0023] In a next step 18 the calculated characteristic value Y is compared with a threshold characteristic value Yth. If the characteristic value Y exceeds the threshold characteristic value Yth, then an acoustic and / or optical signal is indicated by a user interface in a step 20 in order to inform the user that a drying function is required. Alternatively, the drying function is automatically started, if the calculated value Y exceeds the threshold characteristic value Yth. Said drying function is provided for remove the condensate from the oven cavity.

[0024] In a further step 22 the drying function is running for a predetermined time. After the drying function has been ended, the method ends in a last step 24.

[0025] However, if the characteristic value Y falls below the threshold characteristic value Yth in the step 18, then the method is ended in the last step 24.

[0026] FIG 2 illustrates a schematic graphical representation of the characteristic value Y as function of the selected steam function SF, the time t and the temperature T according to the first embodiment of the present invention.

[0027] The selected steam function SF, the time t and the temperature T form three cartesian variables of a three-dimensional space. The threshold characteristic value Yth is represented by a plane surface in said three-dimensional space. In general, the threshold characteristic value Yth may be represented by an arbitrary surface in the three-dimensional space.

[0028] The characteristic value Y exceeding the threshold value Yth form a half-space above the surface of the threshold characteristic value Yth, while the characteristic value Y falling below the threshold characteristic value Yth form the half-space beneath the surface of the threshold characteristic value Yth.

[0029] FIG 3 illustrates a schematic flow chart diagram of the method for determining the condensation in the oven cavity not according to the present invention.

[0030] In the first step 10 the steam cooking function is selected. In the next step 12 said steam cooking function is running. In the further step 14 the steam cooking function is ended either automatically by the timer or manually by the user.

[0031] In a step 26 the humidity H in the oven cavity is detected. In a next step 28 the detected humidity H is compared with a threshold humidity value Hth. If the humidity value H exceeds the threshold humidity value Hth, then the acoustic and / or optical signal is indicated by the user interface in the step 20 in order to inform the user that the drying function is required. Alternatively, the drying function is automatically started, if the calculated value Y exceeds the threshold characteristic value Yth. Said drying function is provided for remove the condensate from the oven cavity.

[0032] In the next step 22 the drying function is running. During the step 22 the humidity H in the oven cavity is detected continuously or at certain times. In a further step 30 the detected humidity H is compared with the threshold humidity value Hth. If the humidity value H exceeds the threshold humidity value Hth, then the drying function is continued in the step 22. If the humidity value H falls below the threshold humidity value Hth, then the method is ended in the last step 24.

[0033] FIG 4 illustrates a schematic flow chart diagram of the method for determining the condensation in the oven cavity not according to the present invention.

[0034] In the first step 10 the steam cooking function is selected. In the next step 12 said steam cooking function is running. At the same time an estimation algorithm is running in a step 32. In the further step 14 the steam cooking function is ended either automatically by the timer or manually by the user. From the estimation algorithm of step 32 an estimated run time t e for the drying function is calculated in a step 34.

[0035] In this example the detected humidity H is used to calculate the estimated run time t e for the drying function. The estimated run time t e is compared with a threshold value t e th, wherein the decision if the drying function is running or not depends on said comparison.

[0036] In a step 36 the estimated run time t e is compared with the corresponding threshold value t e th. If the estimated run time t e exceeds the threshold value t e th, then the acoustic and / or optical signal is indicated by the user interface in the step 20 in order to inform the user that the drying function is required. The user may decide to start the drying function. Alternatively, the drying function is automatically started, if the estimated run time t e exceeds the threshold value t e th. Said drying function is provided for removing the condensate from the oven cavity.

[0037] In the next step 22 the drying function is running. During the step 22 the estimation algorithm is running and the estimated run time t e is adjusted in a step 38. Then, the step 36 is repeated, wherein the estimated run time t e is compared with the corresponding threshold value t e th again. If the estimated run time t e exceeds the threshold value t e th, then the drying function is continued in the step 22, wherein the estimation algorithm is running and the estimated run time t e is adjusted in the step 38. If the estimated run time t e falls below the threshold value t e th, then the method is ended in the last step 24.

[0038] The estimated run time t e from the step 34 is checked at step 36. If the remaining estimated run time t e is bigger than zero, then an adjusted estimated run time t' e is calculated in the step 38.

[0039] FIG 5 illustrates a schematic diagram of the humidity inside the oven cavity as function of the time t during a steam cooking function and a drying function not according to the present invention.

[0040] The steam cooking function is started at t = A and is finished at t = B. The drying function is started after the steam cooking function at t = C and is finished at t = D. In this schematic example, the humidity H increases linearly in the beginning of the steam cooking function, is constant during the remaining steam cooking function and decreases linearly during the drying function. However, the real steam cooking function and drying function are more complex, so that the humidity H may increase arbitrarily in the beginning of the steam cooking function, may fluctuate during the remaining steam cooking function and may decrease in an arbitrary way during the drying function.

[0041] The estimated run time t e for the drying function is calculated in the step 34 in FIG 4 by the formula t e = ∫ D H t dt / k <mprescripts / > A <none / > , wherein k is a humidity factor of the steam cooking function. The humidity factor k represents the quantity of the humidity generated during the steam cooking function per second. The estimated time te is a preliminary value for the duration of the drying function.

[0042] The adjusted estimated run time t'e is given by the formula t ′ e = t e − ∫ D H t dt / k ′ <mprescripts / > C <none / > , wherein k' is a drying factor of the drying function and represent the quantity of the humidity dried during the drying function per second. The adjusted estimated time t' e is an actual value for the duration of the drying function.

[0043] Optionally, the adjusted estimated run time is stored for further steam cooking and drying functions.List of reference numerals

[0044] 10step of selecting a steam cooking function 12step of running the steam cooking function 14step of ending the steam cooking function 16step of calculating a characteristic value 18step of comparing the characteristic value with a threshold characteristic value 20step of indication the need of a drying function 22step of running the drying function 24step of ending the method 26step of detecting the humidity 28step of comparing the detected humidity with a threshold humidity value 30step of comparing the detected humidity with a threshold humidity value during the drying function 32step of running an estimation algorithm 34step of calculating the estimated run time for the drying function 36step of comparing the estimated run time with a threshold value 38step of running the estimation algorithm and adjusting the estimated run time ttime Ttemperature SFselected steam function Ycharacteristic value Yththreshold characteristic value Hhumidity Hththreshold humidity value k1first coefficient k2second coefficient Astart of steam cooking function Bend of steam cooking function Cstart of drying function Dend of drying function khumidity factor k'drying factor t e estimated run time for drying function t e ththreshold value for the estimated run time t' e adjusted estimated run time for drying function

Claims

1. A method for performing a drying function after a cooking function, in particular after a steam cooking function, wherein said method comprises the steps of: - running the cooking function or steam cooking function (12) for a predetermined time or being manually finished by the user, - calculating (16) at least one parameter value (Y) after the cooking function or steam cooking function has been finished, - comparing (18) the calculated parameter value (Y) with a corresponding threshold parameter value (Yth), - checking, if the drying function is required, wherein the drying function is required if the calculated at least one parameter value (Y) exceeds the corresponding threshold parameter value (Yth), and - running the drying function (22) if required, characterized in that the at least one parameter value is a characteristic value (Y) which is calculated (16) by the formula Y SF t T = t ⋅ k 1 SF + T ⋅ k 2 SF , wherein SF is a selected cooking function or steam cooking function, t is the time said cooking function or steam cooking function was running, T is the temperature during the cooking function or steam cooking function, k1 and k2 are coefficients depending on the selected cooking function or steam cooking function, and wherein the characteristic value (Y) is compared (18) with a corresponding threshold characteristic value (Yth), wherein said threshold characteristic value (Yth) is a function of the selected steam function (SF), the time (t) said steam function was running and the temperature (T) during the steam function.

2. The method according to claim 1, characterised in that if the drying function is required, then the need of said drying function is indicated (20) on a user interface and / or said drying function is started automatically, wherein preferably the user interface asks the user if the drying function should be started manually by said user or automatically.

3. The method according to claim 1 or 2, characterised in that the drying function is finished either after a predetermined time or if the calculated parameter value (Y; te) falls below a corresponding threshold parameter value (Yth; teth).

4. The method according to claim 1, characterised in that the drying function is required and started manually or automatically, if the characteristic value (Y) exceeds the threshold characteristic value (Yth), and is finished, if the characteristic value (Y) falls below the threshold characteristic value (Yth).

5. The method according to claim 1, characterised in that the humidity (H) inside the oven cavity is detected after the end (14) of the cooking function or steam cooking function (12) and in that if the detected humidity (H) exceeds a threshold humidity value (Hth), then the drying function is required and started manually or automatically.

6. The method according to claim 5, characterised in that the humidity (H) inside the oven cavity is detected during the drying function, wherein said drying function is continued, if the detected humidity (H) exceeds the threshold humidity value (Hth), while said drying function is finished, if the detected humidity (H) falls below the threshold humidity value (Hth).

7. The method according to any one of the claims 1, 5 or 6, characterised in that an estimated run time (te) for the drying function is calculated after the cooking function or steam cooking function by the formula t e = ∫ B H t dt / k <mprescripts / > A <none / > , wherein A is the start of the cooking function or steam cooking function, B is the end of the cooking function or steam cooking function and k is a humidity factor of the cooking function or steam cooking function.

8. The method according to any one of the claims 1 or 5 to 7, characterised in that an adjusted estimated run time (t'e) for the drying function is calculated during the drying function by the formula t ′ e = t e − ∫ D H t dt / k ′ <mprescripts / > C <none / > , wherein C is the start of the drying function, D is the end of the drying function and k is a drying factor of the drying function.