System comprising a cooking appliance with a cooking chamber and a ventilation device, and method for operating a system

Abstract

System (2), comprising a cooking appliance (4) with a cooking chamber and a cooking appliance control unit for controlling at least one heating device of the cooking appliance (4) for heating the cooking chamber, and an extractor fan (6) with an extractor fan control unit for controlling an extractor fan for extracting fluid escaping from the cooking chamber, wherein the extractor fan control unit is directly or indirectly connected to the cooking appliance control unit and / or to at least one sensor of the system (2) via signal transmission, and wherein the extractor fan can be controlled depending on an operating state of the cooking appliance (4) and / or at least one measured value of the sensor, wherein the system (2) is designed and configured such that this control of the extractor fan is designed as an automatic, staged operation of the extractor fan.wherein the staged operation comprises at least a first stage with a corresponding first speed of the extractor fan and a second stage immediately following the first stage with a corresponding second speed of the extractor fan, characterized in that the operating state of the cooking appliance (4) is a pyrolysis mode for cleaning the cooking chamber, and wherein the extractor fan is initially operated automatically in the first stage after the pyrolysis mode has been started and is operated in the second stage after the first stage.

Description

The invention relates to a system comprising a cooking appliance having a cooking chamber and an extractor device of the type mentioned in the preamble of claim 1 and a method for operating a system.Systems of this type, comprising a cooking appliance with a cooking chamber and an extractor device, and methods for operating systems of this type, are already known from the prior art in a multiplicity of embodiments. The known systems comprise a cooking appliance with a cooking chamber and a cooking appliance control for controlling at least one heating device of the cooking appliance for heating the cooking chamber, and an extractor device with an extractor device control for controlling an extractor device fan for extracting fluid escaping from the cooking chamber. A cooking appliance with a cooking chamber is known from the publication DE 10 2019 209 075 A1.The publication DE 10 2019 125 673 A1 which forms the generic type shows that the extractor device controller is connected in a signal-transmitting manner directly or indirectly to the cooking appliance controller and / or to at least one sensor of the system, and wherein the extractor device blower can be actuated as a function of an operating state of the cooking appliance and / or at least one measured value of the sensor.The object of the invention is thus to improve a system comprising a cooking appliance having a cooking chamber and an extractor device, and a method for operating such a system.According to the invention, this object is achieved by a system having the features of claim 1 and by a method having the features of claim 6. For this purpose, the system is designed and configured in such a way that this activation of the extractor blower is designed as an automatic stepwise operation of the extractor blower, wherein the stepwise operation comprises at least one first stage with a corresponding first rotational speed of the extractor blower and a second stage, directly following the first stage in time, with a corresponding second rotational speed of the extractor blower.The cooking appliance with a cooking chamber can be designed, for example, as an oven, a steam oven, a microwave appliance or a combination appliance with a plurality of different heating devices. According to the invention, the cooking appliance has a pyrolysis operating mode for cleaning its cooking chamber.The extractor device can be designed, for example, as an extractor device designed to be suitable for circulating air operation or for exhaust air operation. The system can also be designed as a system for household or a system for industrial operation, i.e. for professional use. Furthermore, this problem is solved by a method for operating a system having the features of claim 6. Advantageous embodiments and further developments of the invention are evident from the following dependent claims.The advantage that can be achieved with the invention is in particular that a system comprising a cooking appliance with a cooking chamber and an extractor hood device, and a method for operating such a system, are improved. Due to the inventive design of the system and the method for operating the same, it is possible to automatically suck away disruptive and unpleasant fluids, such as, for example, vapours and / or steam, escaping from the cooking chamber of the cooking appliance into the free environment, with or without exposure to fragrances, in such a way that a disturbance in this respect is not perceptible at all by a user of the system. At the same time, the suction output of the extractor blower can be adapted to the requirements of the individual case in such a way that this takes place with the lowest possible energy consumption and the lowest possible noise emission. The automatic stepwise operation of the extractor blower according to the invention as a function of an operating state of the cooking appliance and / or at least one measured value of the sensor makes timely intervention by the user of the system unnecessary, so that, in addition, the operating comfort during use of the system according to the invention is increased.According to one aspect of the invention, the cooking appliance is designed as a cooking appliance with a pyrolysis operating mode for cleaning the cooking chamber, wherein the extractor blower is initially automatically operated in a first stage designed as a lead after the start of the pyrolysis operating mode and is operated in a second stage designed as a main operation temporally after the first stage. This makes it possible to remove the odors in a targeted manner by the pyrolysis operation or, in the case of a circulating air hood, to feed them to the extractor device at least through a powerful odor filter.In principle, the system according to the invention can be freely selected within wide suitable limits in terms of type, mode of operation, material, dimensioning and spatial arrangement of the individual components of the system with respect to one another. In this regard, see, for example, the corresponding statements in the introduction to the description. Furthermore, this applies in particular to the spatial arrangement of the vapor extraction device relative to the cooking appliance. The signal transmission connection between the cooking appliance and the extractor device and / or between the extractor device and the at least one sensor can be configured to be wired or wireless. In addition, a signal transmission connection by means of a cloud, i.e. by means of an Internet server, is also conceivable. Accordingly, for example, basic settings of the system according to the invention and basic information about the system according to the invention and its operating state can be easily set and managed, for example by means of an app.An advantageous development of the system according to the invention provides that the system is designed and configured such that at least one of the at least two stages can be executed for a predetermined period of time, independently of a measured value of the at least one sensor. In this way, it is ensured that the extractor blower is not switched on and off in an undesired manner or switches back and forth unnecessarily often between the individual stages. Accordingly, the system according to the invention results in an overall smoother operation and thus more comfortable for a user of the system.Accordingly, an advantageous development of the method according to the invention provides that at least one of the at least two stages is carried out for a predetermined period of time, independently of a measurement value of the at least one sensor.A further advantageous refinement of the system according to the invention provides that the at least one sensor is designed as a sensor from the following group: steam sensor, moisture sensor, odor sensor, temperature sensor. As a result, a sensing of the essential interference factors can be detected for a user of the system according to the invention during its operation and can therefore be eliminated, at least reduced, according to the invention. The at least one sensor can be arranged within the cooking appliance and / or outside the cooking appliance, for example on the vapor extraction device.Accordingly, an advantageous further development of the method according to the invention provides that at least one of the following variables is sensed by means of the at least one sensor in the cooking chamber and / or in a free environment of the cooking chamber: steam, moisture, odour, temperature, volatile organic compounds (VOC).A particularly advantageous development of the system according to the invention provides that the automatic stepwise operation of the extractor blower has, in addition to the first and the second stage, a third stage with a third rotational speed of the extractor blower corresponding thereto, wherein the third stage is formed directly following the second stage in terms of time and the first stage is formed as a lead, the second stage as a main operation and the third stage as a lag of the extractor blower, and wherein the first rotational speed and the third rotational speed are each formed smaller than the second rotational speed, preferably that the first corresponds to the third rotational speed. In this way, a particularly effective operation of the system according to the invention is made possible. By means of the flow path, for example, even below a perception threshold of a user of the system, intervention can be automatically effected in order to thus achieve, in an early stage, a preferential flow of a fluid escaping from the cooking chamber of the cooking appliance and, for example, laden with fragrances. During the main operation, the actual elimination, but at least reduction, of the aforementioned interference factors takes place. Finally, the run-on ensures the removal / reduction of the remaining fluid from the free environment in the region of the cooking appliance. This applies in particular to the preferred embodiment of this refinement.Accordingly, a particularly advantageous development of the method according to the invention provides that the automatic stepwise operation of the extractor blower has, in addition to the first and the second stage, a third stage with a third rotational speed of the extractor blower corresponding thereto, wherein the third stage directly follows the second stage in terms of time and the first stage is designed as a lead, the second stage as a main operation and the third stage as a lead of the extractor blower, and wherein the first rotational speed and the third rotational speed are each less than the second rotational speed, preferably that the first corresponds to the third rotational speed.A particularly advantageous development of the aforementioned embodiment of the method according to the invention provides that the cooking appliance is designed as a cooking appliance with a pyrolysis operating mode for cleaning the cooking chamber, wherein the extractor blower, after a start of the pyrolysis operating mode, is initially operated automatically in the first stage designed as a lead, directly after the first stage in the second stage designed as a main operation, and directly after the second stage in the third stage designed as a lead. As a result, the method according to the invention is made usable for an operating mode of the cooking appliance according to the invention which is particularly problematic with regard to a possible odor nuisance. Especially in the pyrolysis operation of a cooking appliance designed as a pyrolysis appliance, odor nuisance is otherwise unavoidable and can only be reduced by an opened kitchen window or the like. Since a pyrolysis process generally takes place over several hours, this is also disadvantageous for energy reasons. For example, the transition times and the winter time with their low external temperatures may be mentioned here. Independently of this, it is also undesirable for a user of the cooking appliance to keep the aforementioned kitchen window open for hours, for example.An advantageous development of the latter embodiment of the method according to the invention provides that the first and / or second and / or third stage is / are automatically switched on and off depending on a predefined period of time of the pyrolysis mode, preferably that the first stage is switched on by means of the start of the pyrolysis mode and / or is switched over from the first stage to the second stage after a period of time of greater than or equal to 30 min after the start of the pyrolysis mode and / or is switched over from the second stage to the third stage when a remaining residual time for the pyrolysis mode of less than or equal to 25 min remains and / or the third stage is switched off after a period of time of 15 min after the end of the pyrolysis mode. In this way, a very effective and thorough suction of fluid, for example, contaminated with odorants and escaping from the cooking chamber of the cooking appliance is made possible.Alternatively or additionally to the aforementioned embodiment of the method according to the invention, a further advantageous development of the method according to the invention provides that a changeover from the first stage to the second stage and / or from the second stage to the third stage in each case takes place automatically as a function of a previously defined temperature in the cooking chamber during the pyrolysis operation, preferably that after the temperature in the cooking chamber has been exceeded for the first time from 200° C., the changeover is automatically made from the first stage to the second stage and / or after the temperature in the cooking chamber has been exceeded for the first time from 400° C., the changeover is automatically made from the second stage to the third stage. By means of the aforementioned monitoring of the cooking chamber temperature during the pyrolysis operation of the cooking appliance, a more flexible operation of the system according to the invention is made possible, so that the method according to the invention according to this refinement can be better adapted to the circumstances in the respective individual case. Furthermore, this refinement can be combined with the aforementioned refinement in a suitable manner within the technical limits, with the result that the advantages from both refinements can be used.Furthermore, an advantageous development of the method according to the invention provides that a changeover from the first stage to the second stage and / or from the second stage to the third stage in each case takes place automatically as a function of a previously defined odorant concentration in the cooking chamber and / or in the free environment of the cooking chamber during the pyrolysis operation, preferably that, after a previously defined first odorant concentration has been exceeded for the first time, a changeover is automatically made from the first stage to the second stage and / or, after a previously defined second odorant concentration has been undershot for the first time, a changeover is automatically made from the second stage to the third stage, preferably that the second odorant concentration corresponds to the first odorant concentration. This makes it possible to perform the switching on and off of the respective stage of the plurality of stages in the automatic stepwise operation of the range extractor blower in direct dependence on the odor nuisance, namely the odor substance concentration. This applies in particular to the preferred embodiments of this refinement. As already explained with regard to the aforementioned further development with regard to the measurement of the cooking chamber temperature, it is also possible here to combine this further development with the two latter further developments in a suitable manner within the technical limits.An exemplary embodiment of the invention is illustrated purely schematically in the drawings and is described in more detail below. It shows FIG. 1 shows an exemplary embodiment of the system according to the invention for carrying out the method according to the invention, FIG. 2 is a time-perfume concentration graph of the embodiment; and FIG. 3 shows a flow chart for illustrating a first variant and a second variant of the method according to the invention of the exemplary embodiment.FIGS. 1, 2 to 3 show an exemplary embodiment of the invention purely by way of example.The system 2 comprises here a cooking appliance 4 designed as a household oven with a cooking chamber, not shown, and a cooking appliance controller, also not shown, for controlling at least one heating device, not shown, of the cooking appliance 4 for heating the cooking chamber. In the present exemplary embodiment, the cooking appliance 4 is designed as a cooking appliance with a pyrolysis operating mode for cleaning the cooking chamber. Furthermore, the system 2 has an extractor hood 6 with an extractor hood control, not shown, for controlling an extractor blower, also not shown, for extracting fluid escaping from the cooking chamber. The fluid, for example a fluid escaping from the cooking chamber of the cooking appliance 4 during a pyrolysis operation of the cooking appliance 4 and contaminated with disruptive odorants, is likewise not illustrated. The extractor device 6 is designed here to be suitable for an exhaust air operation.In the present exemplary embodiment, the vapor extraction device controller is connected indirectly in a signal-transmitting manner to the cooking appliance controller and to at least one sensor of the system 2 designed as a temperature sensor for measuring a cooking chamber temperature in the cooking chamber of the cooking appliance 4 by means of a so-called cloud 8, i.e. an Internet server, in a manner known per se to the person skilled in the art. The temperature sensor is arranged in the cooking chamber and is not shown in FIG. 1. The signal transmission connections, on the one hand, between the cooking appliance 4 and the cloud 8 and, on the other hand, between the vapor extraction device 6 and the cloud 8 are symbolized in FIG. 1 by double arrows 10, 12. Alternatively or additionally to the temperature sensor, the system according to the invention can also have other sensors in other embodiments. These sensors can then be arranged inside and / or outside the cooking appliance, for example on an underside of the vapor extraction device facing the cooking appliance.In the present exemplary embodiment, depending on the variant of the exemplary embodiment under consideration, the extractor blower can be controlled as a function of an operating state of the cooking appliance 4 or as a function of an operating state of the cooking appliance 4 and at least one measured value of the sensor. In the first variant, the extractor blower can be automatically controlled as a function of the operating state of the cooking appliance 4, namely as a function of the selection of the aforementioned pyrolysis operating mode. In the second variant, the extractor blower can be automatically controlled on the one hand as a function of the operating state of the cooking appliance 4, namely as a function of the selection of the aforementioned pyrolysis operating mode, and on the other hand as a function of at least one measurement value of the sensor, namely as a function of the cooking chamber temperature measured in the cooking chamber during the pyrolysis operation.According to the invention, the system 2 is designed and configured such that this control of the extractor fan is designed as an automatic stepwise operation of the extractor fan, wherein the stepwise operation comprises at least a first stage with a corresponding first rotational speed of the extractor fan and a second stage, directly following the first stage in time, with a corresponding second rotational speed of the extractor fan.In the first variant of the exemplary embodiment, the system 2 is designed and configured such that the first and the two stages can be executed for a predefined period of time, each independently of the measurement values of the sensor. This is explained in more detail below with reference to FIG. 3.In addition to the first and second stages, the automatic stepwise operation of the extractor fan has a third stage with a third rotational speed of the extractor fan corresponding thereto, wherein the third stage is formed directly following the second stage in time and the first stage is formed as a lead, the second stage as a main operation and the third stage as a lead of the extractor fan, and wherein the first rotational speed and the third rotational speed are each formed smaller than the second rotational speed, and wherein the first corresponds to the third rotational speed. This is explained in more detail below with reference to FIG. 3.The mode of operation of the system according to the invention and the method according to the invention for operating the system according to the present exemplary embodiment are now explained in more detail with reference to FIGS. 1, 2 to 3.The system 2 is initially in a rest state, in which the cooking appliance 4 and the vapor extraction device 6 are each switched off. A user, not shown, now wishes to clean the cooking chamber of the cooking appliance 4. For this purpose, the user selects the aforementioned pyrolysis operating mode of the cooking appliance 4, for example by means of a smartphone or the like, not shown, and an app installed thereon. The smartphone is connected to the cloud 8 in a signal-transmitting and data-transmitting manner in a manner known to the person skilled in the art. By means of the above-mentioned app, it is possible, for example, to easily set and manage basic settings of the system 2 according to the invention and basic information relating to the system 2 according to the invention and its operating state in a manner known per se to the person skilled in the art. For example, the automatic stepwise operation of the extractor blower according to the invention can be stored as a so-called default setting, i.e. as an automatically set preselection in the app. It is also conceivable that this aforementioned default setting by means of the app can be replaced by a manual selection via app required in the respective individual case. Accordingly, the user can use the app to define the user's desired mode operandi of the system 2.According to the aforementioned settings in the app, the system 2 recognizes that the cooking appliance 4 is a cooking appliance with a pyrolysis operating mode. In this regard, see step 100 in FIG. 3. Furthermore, the system 2 recognizes that the method explained in more detail below with the automatic stepwise operation of the extractor blower is preselected, for example. See step 110 in FIG. 3.The user starts the pyrolysis operation of the cooking appliance 4 by selecting the pyrolysis operating mode of the cooking appliance 4, for example via the abovementioned app.FIG. 2 shows a variation of the odorant concentration in the free environment of the cooking appliance 4 as a function of time, wherein the time axis runs horizontally and the odorant concentration axis runs vertically in the image plane of FIG. 2. In this regard, see the solid line in FIG. 2 As can be seen from this, the odour load of the free environment of the cooking appliance 4, that is to say the concentration of the odour substances in the free environment of the cooking appliance 4, is at the highest in a time period of from about 60 min to about 90 min after the start of the pyrolysis operation. During this period of time, the emission of fragrances from the cooking chamber of the cooking appliance 4 into the free environment reaches a peak value. Accordingly, the odour load caused by the odour substances emitted from the cooking chamber during pyrolysis increases from the start of pyrolysis, i.e. at a time period of 0 min, to about 75 min after the start of pyrolysis and then decreases to a merely low value in the further course of pyrolysis, i.e. from about 75 min to, for example, 380 min. See the dashed line in FIG. 2.As already explained above, the automatic stepwise operation of the extractor blower has the first, the second stage and the third stage with a first, second and third rotational speed of the extractor blower corresponding to it, wherein the extractor blower is operated after the start of the pyrolysis operating mode, i.e. at a time duration of the pyrolysis operation of 0 min, initially automatically in the first stage configured as a lead, directly after the first stage in the second stage configured as a main operation and directly after the second stage in the third stage configured as a lag. The start of the pyrolysis operation, i.e., the time duration 0 min, corresponds to step 110 in FIG. 3.According to the first variant of the present exemplary embodiment, the first stage is automatically switched on as a function of a previously defined period of time of the pyrolysis operation, namely the period of time equal to 0 min. See step 120 in FIG. 3, after a period of 30 min has elapsed after the start of the pyrolysis mode, the system automatically switches from the first stage at the first speed of the extractor fan to the second stage at the second speed of the extractor fan. In this regard, see step 130 in FIG. 3. In the case of a remaining remaining time for the pyrolysis operation of less than or equal to 25 min, the system then automatically switches from the second stage to the third stage at the third rotational speed of the extractor blower. In this regard, see step 140 in FIG. 3. After a time duration of 15 min has elapsed after termination of the pyrolysis operation, the third stage is automatically switched off. In this regard, see step 150 in FIG. 3. As already explained above, the third rotational speed in the present exemplary embodiment corresponds to the first rotational speed. The first and / or second and / or third rotational speed can correspond, for example, to a first and / or second and / or third stage of the extractor blower that can be manually adjusted on the extractor 6. However, this is not necessarily the case. Accordingly, it is also conceivable that the first and / or second and / or third rotational speed corresponding to the first and / or second and / or third stage of the automatic stepwise operation of the extractor blower according to the invention differs / differs from the aforementioned manually adjustable stages.As likewise already explained, the first stage corresponds to the forward run, the second stage corresponds to the main operation, and the third stage corresponds to the rearward run of the extractor blower, wherein the first rotational speed and the third rotational speed are each designed to be smaller than the second rotational speed. In this way, a particularly effective operation of the system 2 is made possible. By means of the flow, it is possible, for example, to intervene automatically already below a perception threshold of the user of the system 2 for the fragrances produced during pyrolysis in the cooking chamber of the cooking appliance 4, in order to thus achieve, in an early stage, a preferential flow of the fluid escaping from the cooking chamber of the cooking appliance 4 and laden with fragrances. During the main operation, the actual removal, but at least reduction, of the odorants formed during the pyrolysis operation and reaching the free environment from the cooking chamber takes place. Finally, the run-on ensures the removal / reduction of the residual fragrances from the free environment in the area of the cooking appliance 4.According to the second variant, the method sequence is modified in comparison with the method sequence according to the first variant, as explained below:In the second variant of the present exemplary embodiment, the first stage is again automatically switched on as a function of a previously defined time duration of the pyrolysis operation, namely the time duration equal to 0 min. See step 120 in FIG. 3.The changeover from the first stage to the second stage and from the second stage to the third stage takes place here, however, in each case as a function of a predetermined temperature in the cooking chamber during the pyrolysis operation. Namely, in that after the temperature in the cooking chamber has been exceeded from 200° C. for the first time, the system automatically switches from the first stage to the second stage. In this regard, see step 130 in FIG. 3 : After the temperature in the cooking chamber has been exceeded by 400° C. for the first time, the system is then automatically switched from the second stage to the third stage. In this regard, see step 140 in FIG. 3 : After a time duration of 15 min has elapsed after termination of the pyrolysis operation, the third stage, analogously to the first variant of the exemplary embodiment, is automatically switched off. See step 150 in FIG. 3.Due to the inventive design of the system and the method for operating the same according to the present exemplary embodiment, it is thus possible to automatically suck away disruptive and unpleasant fluids, such as the fluid of the exemplary embodiment contaminated with disruptive fragrances, escaping from the cooking chamber of the cooking appliance 4 into the free environment in such a way that a relevant disturbance is not perceptible at all by a user of the system 2. At the same time, the suction output of the extractor blower can be adapted to the requirements of the individual case in such a way that this takes place with the lowest possible energy consumption and the lowest possible noise emission. The automatic stepwise operation of the extractor blower according to the invention as a function of an operating state of the cooking appliance 4 and / or at least one measured value of the sensor makes timely intervention by the user of the system 2 unnecessary, so that, in addition, the operating comfort when using the system 2 according to the invention is increased.However, the invention is not limited to the present exemplary embodiment of the system and method according to the invention.For example, the system, in particular the cooking appliance and the extractor device, can be freely selected within wide suitable limits. See also the explanations in the introduction to the description.In particular, the invention is not limited to the structural details and process engineering design of the present exemplary embodiment.Thus, as an alternative or in addition to the aforementioned embodiments of the exemplary embodiment, it is conceivable that a changeover from the first stage to the second stage and / or from the second stage to the third stage takes place automatically in each case as a function of a previously defined odorant concentration in the cooking chamber and / or in the free environment of the cooking chamber during the pyrolysis operation, preferably that after a first exceeding of a previously defined first odorant concentration, a changeover is automatically made from the first stage to the second stage and / or after a first falling below of a previously defined second odorant concentration, a changeover is automatically made from the second stage to the third stage, preferably that the second odorant concentration corresponds to the first odorant concentration. This makes it possible to perform the switching on and off of the respective stage of the plurality of stages in the automatic stepwise operation of the range extractor blower in direct dependence on the odor nuisance, namely the odor substance concentration. This applies in particular to the preferred embodiments of this refinement.The aforementioned odor measurement, i.e., for example, the detection of an odor substance concentration in the free environment of the cooking appliance, can be carried out by means of a photo-ionization detector, PID for short.In addition, it is also possible to combine the above-mentioned development suitably within the technical limits with the two variants mentioned on the basis of the exemplary embodiment and explained purely by way of example. Of course, other suitable combinations are also possible. Accordingly, the skilled person can adapt the invention to the requirements of the individual case, so that the system according to the invention and the method according to the invention can be used advantageously for a multiplicity of application cases.In contrast to the present exemplary embodiment, it is thus possible for the at least one sensor to also be designed as a sensor from the following group: steam sensor, moisture sensor, odor sensor, VOC sensor. In particular, a combination of sensors different from one another, i.e. of sensor techniques different from one another, is also conceivable. For example, in other embodiments of the invention, the temperature sensor of the embodiment could be combined with one or more of the aforementioned sensors. Accordingly, it is possible by means of the at least one sensor in the cooking chamber and / or in a free environment of the cooking chamber to sense at least one of the following variables: steam, moisture, odor, temperature. Thus, as an alternative or in addition to the operating mode of the exemplary embodiment configured as a pyrolysis operating mode, the invention can also be used advantageously in other operating modes of the cooking appliance, for example an operating mode configured as climate cooking and / or steam cooking.Instead of the cooking chamber temperature, in other embodiments of the invention, a catalyst temperature on a catalyst connected to the cooking chamber in a flow-conducting manner can also be used by means of the at least one sensor designed as a temperature sensor for regulating or controlling the automatic stepwise operation of the extractor blower according to the invention.If instead of an extractor device for the exhaust air operation an extractor device for the recirculation air operation is used, the fluid laden with disruptive odour materials is conducted, for example, through an activated carbon filter of the extractor device.

Claims

System (2) comprising a cooking appliance (4) with a cooking chamber and a cooking appliance controller for controlling at least one heating device of the cooking appliance (4) for heating the cooking chamber, and an extractor device (6) with an extractor device controller for controlling an extractor device fan for extracting fluid escaping from the cooking chamber, wherein the extractor device controller is connected in a signal-transmitting manner directly or indirectly to the cooking appliance controller and / or to at least one sensor of the system (2), and wherein the extractor device fan can be controlled as a function of an operating state of the cooking appliance (4) and / or at least one measured value of the sensor, wherein the system (2) is designed and configured such that this control of the extractor device fan is designed as an automatic stepwise operation of the extractor device fan, wherein the stepwise operation comprises at least a first stage with a corresponding first rotational speed of the extractor fan and a second stage, directly following the first stage in time, with a corresponding second rotational speed of the extractor fan, characterized in that the operating state of the cooking appliance (4) is a pyrolysis operating mode for cleaning the cooking chamber, and wherein the extractor fan is operated automatically in the first stage after a start of the pyrolysis operating mode and is operated in the second stage temporally after the first stage.System (2) according to Claim 1, characterized in that the extractor device controller is connected in a signal-transmitting manner directly or indirectly to the at least one sensor of the system (2).The system (2) according to one of the two preceding claims, characterized in that the system (2) is designed and configured such that at least one of the at least two stages can be executed for a predetermined period of time, independently of a measurement value of the at least one sensor.System (2) according to one of the preceding claims, characterized in that the at least one sensor is designed as a sensor from the following group: steam sensor, moisture sensor, odor sensor, temperature sensor, VOC sensor.System (2) according to one of the preceding claims, characterized in that the automatic stepwise operation of the extractor blower has, in addition to the first and the second stage, a third stage with a third rotational speed of the extractor blower corresponding thereto, wherein the third stage is formed directly following the second stage in time and the first stage is formed as a lead, the second stage as a main operation and the third stage as a lag of the extractor blower, and wherein the first rotational speed and the third rotational speed are each formed smaller than the second rotational speed, preferably that the first corresponds to the third rotational speed.Method for operating a system (2) according to one of Claims 1 to 5, characterized in that the extractor fan is operated in an automatic stepwise operation, wherein this stepwise operation comprises at least a first stage with a first rotational speed of the extractor fan corresponding thereto and a second stage, directly following the first stage in time, with a second rotational speed of the extractor fan corresponding thereto, characterized in that the cooking appliance (4) is designed as a cooking appliance (4) with a pyrolysis operating mode for cleaning the cooking chamber, wherein the extractor fan, after a start of the pyrolysis operating mode, is initially operated automatically in a first stage designed as a lead and is operated in a second stage designed as a main operation in time after the first stage.Method according to claim 6, characterized in that at least one of said at least two steps is carried out for a predetermined period of time, independently of a measurement value of said at least one sensor.Method according to claim 6 or 7, characterised in that at least one of the following variables is sensed by means of the at least one sensor in the cooking chamber and / or in a free environment of the cooking chamber: steam, moisture, odour, temperature.Method according to one of the preceding claims 6 to 8, characterized in that the cooking appliance (4) is designed as a cooking appliance (4) with a pyrolysis operating mode for cleaning the cooking chamber, wherein the extractor fan, after a start of the pyrolysis operating mode, is initially operated automatically in the first stage designed as a run-on, directly after the first stage in the second stage designed as a main operation and directly after the second stage in a third stage designed as a run-on.Method according to one of Claims 6 to 9, characterized in that the automatic stepwise operation of the extractor blower has, in addition to the first and the second stage, a third stage with a third rotational speed of the extractor blower corresponding thereto, wherein the third stage directly follows the second stage in terms of time and the first stage is designed as a lead, the second stage as a main operation and the third stage as a lead of the extractor blower, and wherein the first rotational speed and the third rotational speed are each less than the second rotational speed, preferably in that the first corresponds to the third rotational speed.Method according to at least one of Claims 6 to 10, characterized in that the first and / or second and / or third stage are / are automatically switched on and off as a function of a predefined period of time of the pyrolysis operation, preferably in that the first stage is switched on by means of the start of the pyrolysis mode and / or is switched over from the first stage to the second stage after a period of time of greater than or equal to 30 minutes after the start of the pyrolysis mode and / or is switched over from the second stage to the third stage in the case of a remaining remaining residual time for the pyrolysis operation of less than or equal to 25 minutes and / or the third stage is switched off after a period of time of 15 minutes after termination of the pyrolysis operation.Method according to at least one of claims 6 to 11, characterised in that a changeover from the first stage to the second stage and / or from the second stage to the third stage is effected automatically in each case as a function of a previously defined temperature in the cooking chamber during the pyrolysis operation, preferably in that, after the temperature in the cooking chamber has been exceeded from 200°C for the first time, the changeover is automatically made from the first stage to the second stage and / or, after the temperature in the cooking chamber has been exceeded from 400°C for the first time, the changeover is automatically made from the second stage to the third stage.Method according to at least one of Claims 6 to 12, characterized in that a changeover from the first stage to the second stage and / or from the second stage to the third stage in each case takes place automatically as a function of a previously defined odorant concentration in the cooking space and / or in the free environment of the cooking space during the pyrolysis operation, preferably in that, after a previously defined first odorant concentration has been exceeded for the first time, a changeover is automatically made from the first stage to the second stage and / or, after a previously defined second odorant concentration has been undershot for the first time, a changeover is automatically made from the second stage to the third stage, preferably in that the second odorant concentration corresponds to the first odorant concentration.

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