Pyrolysis cooking appliance with a cooking chamber and pyrolysis method for cleaning a cooking chamber

Abstract

The invention relates to a pyrolytic cooking appliance (2) comprising a housing (4), a cooking chamber (14) arranged in the housing (4) and bounded by two side walls (6), a rear wall (8), a cooking chamber floor (10) and a cooking chamber ceiling (12) of the pyrolytic cooking appliance (2), a cooking chamber door (16) and a bottom heating device (20) arranged within or below the cooking chamber floor (10) of the cooking chamber (14) for heating the cooking chamber (14) during a pyrolytic cleaning process that pyrolytically cleans the two side walls (6), the rear wall (8), the cooking chamber ceiling (12) and the cooking chamber floor (10), characterized in that the bottom heating device (20) is designed and arranged in such a way thatthat the oven floor (10) can be heated during the pyrolysis process to a pyrolysis temperature required for pyrolytic cleaning of the oven floor (10), and that an exceedance of a lower limit temperature of an oven temperature measured in a center of the oven (14) compared to the aforementioned pyrolysis temperature is prevented, wherein the oven floor (10) has a smooth enamel surface facing the oven (14) and the two side walls (6) and / or the rear wall (8) and / or the oven ceiling (12) have a catalytic surface facing the oven (14). The invention further relates to a pyrolysis process.

Description

[0001] The invention relates to a pyrolysis cooking appliance with a cooking chamber of the type mentioned in the preamble of claim 1 and a pyrolysis method for cleaning a cooking chamber.

[0002] Pyrolytic cooking appliances of this type, comprising a cooking chamber and a pyrolytic cleaning process, are already known in numerous embodiments from the prior art. For example, publication EP 2063184 B1 shows such an appliance.

[0003] The known pyrolytic cooking appliances comprise a housing, a cooking chamber arranged in the housing and bounded by two side walls, a rear wall, a cooking chamber floor and a cooking chamber ceiling of the pyrolytic cooking appliance, a cooking chamber door for closing a cooking chamber opening of the cooking chamber in a closed position of the cooking chamber door and for accessing the cooking chamber by means of the cooking chamber opening in an open position of the cooking chamber door and a bottom heating device arranged inside or below the cooking chamber floor of the cooking chamber for heating the cooking chamber during a pyrolytic cleaning process that pyrolytically cleans the two side walls, the rear wall, the cooking chamber ceiling and the cooking chamber floor.

[0004] The invention therefore addresses the problem of improving a pyrolytic cooking appliance with a cooking chamber and a pyrolytic cleaning process for cleaning a cooking chamber.

[0005] According to the invention, this problem is solved by a pyrolytic cooking appliance with the features of claim 1, characterized in that the bottom heating element is designed and arranged such that, during the pyrolysis process, the oven floor can be heated to a pyrolysis temperature required for pyrolytic cleaning of the oven floor, and, at the same time, an exceedance of a lower limit temperature measured in the center of the oven is prevented, in comparison to the aforementioned pyrolysis temperature. The oven floor has a smooth enamel surface facing the oven, and the two side walls and / or the rear wall and / or the oven ceiling have a catalytic surface facing the oven. Since the bottom heating element is arranged within or below the oven floor, it is located outside the oven.Furthermore, this problem is solved by a pyrolysis process for a pyrolysis cooking appliance with the features of claim 6. The term "pyrolysis process" is to be interpreted broadly and encompasses not only the actual pyrolytic cleaning process, but the entire pyrolysis cleaning program, in particular also a heating phase to achieve the surface temperature required for pyrolytic cleaning on the respective surfaces of the two side walls, the rear wall, the ceiling, and the floor of the cooking chamber facing the cooking chamber. In the process according to the invention, the term "active" means the heating of the cooking chamber floor by means of a switched-on bottom heating element. Accordingly, with the bottom heating element switched on, the cooking chamber floor is heated only section by section and only successively.Therefore, the entire cooking chamber floor is not heated all at once, but rather the cooking chamber floor is heated section by section, one after the other. Advantageous embodiments and further developments of the invention are described in the following dependent claims.

[0006] The advantage achievable with the invention lies particularly in the fact that a pyrolytic cooking appliance with a cooking chamber and a pyrolytic cleaning process for a cooking chamber are improved. Due to the inventive design of the pyrolytic cooking appliance with a cooking chamber and the pyrolytic cleaning process for a cooking chamber, it is possible to adjust the surface temperature prevailing on the respective surface facing the cooking chamber according to the different requirements for sufficient pyrolytic cleaning of these surfaces.Accordingly, the surface of the cooking chamber floor, which is particularly affected by soiling during the cooking process, can be heated to a higher surface temperature compared to the other surfaces mentioned above, while the surface temperature of the remaining surfaces, which are significantly less affected by soiling during the cooking process, is simultaneously limited to a lower temperature value compared to this surface temperature. Consequently, the energy required to carry out a pyrolysis process according to the invention, i.e., the pyrolysis process in the pyrolysis cooking appliance according to the invention, is significantly reduced compared to conventional pyrolysis cooking appliances with a cooking chamber.Furthermore, this significantly reduces the thermal and thus also the mechanical stress on the pyrolysis cooking appliance according to the invention, so that, on the one hand, maintaining the required front and niche temperatures is considerably simpler in terms of design and manufacturing compared to the prior art. On the other hand, the temperature resistance requirements for the electronics in the pyrolysis cooking appliance according to the invention are also lower compared to conventional pyrolysis cooking appliances. The term "smooth" in the pyrolysis cooking appliance according to the invention serves in particular to distinguish the smooth enamel surface of the cooking chamber floor from the catalytic surface of the two side walls and / or the rear wall and / or the cooking chamber ceiling. Accordingly, the aforementioned smooth enamel surface of the cooking chamber floor is not a catalytic surface.Firstly, enamel, also known as enamel, is a durable composite material that is very well suited for such applications. Secondly, the application of a catalytic surface to the two side walls and / or the rear wall and / or the oven ceiling offers the particular advantage that, due to the catalytic effect of the respective surface, it only needs to be heated to a significantly lower temperature for pyrolytic cleaning. Compared to a non-catalytic surface, the surface temperature required for pyrolytic cleaning can be approximately 150°C lower with a catalytic surface. This is because the catalytic surface reduces the activation energy for the decomposition reactions.However, the functionality of catalytic surfaces, i.e. catalytic layers, is limited, so that heavy soiling, for example by grease, cannot be removed without leaving residue.

[0007] Another aspect is that, due to the thermal cleaning carried out in the invention with a lower cooking chamber temperature, there is no need for the otherwise required locking of the cooking chamber door, which increases ease of use and reduces manufacturing costs.

[0008] In principle, the pyrolysis cooking appliance according to the invention can be freely selected within wide suitable limits with regard to type, function, material and dimensions. For example, the pyrolysis cooking appliance according to the invention can be designed as a household appliance or as a commercial appliance, i.e. a pyrolysis cooking appliance for professional use.

[0009] A particularly advantageous embodiment of the pyrolytic cooking appliance according to the invention provides that the bottom heating element has at least two independently controllable heating circuits, wherein at least one of the aforementioned heating circuits is assigned to a section of the cooking chamber floor and at least one other of the aforementioned heating circuits is assigned to a further section of the cooking chamber floor different from this section, and wherein the aforementioned sections each correspond to a portion of a surface of the cooking chamber floor facing the cooking chamber. In this way, it is possible, in a very simple manner from a design, manufacturing, and circuitry perspective, to reliably maintain the cooking chamber temperature in the center of the cooking chamber below the limit temperature throughout the entire pyrolysis process. In particular, it is thus possible to generate the surface temperatures necessary for pyrolysis in local sections of the cooking chamber floor.

[0010] An advantageous further development of the aforementioned embodiment of the pyrolytic cooking appliance according to the invention provides that an inner heating circuit is assigned to an inner section of the cooking chamber floor and an outer heating circuit is assigned to an outer section of the cooking chamber floor that at least partially surrounds the inner section. Preferably, the inner and outer heating circuits are electrically connected to a common power supply of the pyrolytic cooking appliance on a common side of the bottom heating element. This allows the bottom heating element to be divided into at least two independently controllable heating circuits in a particularly simple manner from a design and manufacturing perspective. This applies especially to the preferred embodiment of this further development.

[0011] A further advantageous embodiment of the pyrolytic cooking appliance according to the invention provides that the pyrolytic cooking appliance has at least one additional heating device for heating the cooking chamber during the pyrolysis process. Preferably, the additional heating device is designed as a top-heating device arranged on the ceiling of the cooking chamber, and particularly preferably, the top-heating device is designed as a radiant heater. In this way, the heating of the cooking chamber, and thus of the surfaces delimiting the cooking chamber—the two side walls, the rear wall, the ceiling, and the floor—can be accelerated to achieve the surface temperature required for pyrolytic cleaning. The preferred embodiment also has the advantage that top-heating devices are generally integrated as standard in cooking appliances with cooking chambers.Furthermore, the particularly preferred embodiment has the additional advantage that the radiant energy from the top heating element arranged on the ceiling of the cooking chamber promotes heating, in particular, of the surface of the cooking chamber floor, which is usually the most heavily soiled. Of course, embodiments of the pyrolytic cooking appliance according to the invention are also conceivable in which no top heating element or even only a bottom heating element is present.

[0012] Furthermore, another particularly advantageous embodiment of the pyrolysis cooking appliance according to the invention provides that the catalytic surface of the two side walls and / or the rear wall and / or the cooking chamber ceiling is designed as a catalytic enamel. Enamel, also known as molten enamel, is a durable composite material that is very well suited for such applications.

[0013] Analogous to the pyrolysis cooking device according to the invention, the pyrolysis process according to the invention can also be freely selected within wide suitable limits.

[0014] An advantageous further development of the pyrolysis process according to the invention provides that the aforementioned pyrolysis temperature is greater than or equal to 430°C and less than or equal to 480°C, preferably that the aforementioned pyrolysis temperature is 450°C. This embodiment specifies a suitable temperature range for the partial and gradual heating of the oven floor, whereas the preferred embodiment specifies a particularly preferred pyrolysis temperature for the surface of the oven floor.

[0015] An advantageous embodiment of the pyrolysis process according to claim 6 or 7 provides that during the pyrolysis process, each section of the oven floor is heated to the required pyrolysis temperature only once, or that during the pyrolysis process, each section of the oven floor is heated to the required pyrolysis temperature several times. According to the first alternative of this embodiment, this results in a circuit-technically very simple implementation of the pyrolysis process according to the invention, while according to the second alternative, a more uniform heating of the oven floor is achieved overall.

[0016] A further advantageous embodiment of the pyrolysis process according to the invention provides that a limit temperature of 350°C is not exceeded during the pyrolysis process, preferably a limit temperature of 300°C. In this way, the cooking chamber temperature in the center of the cooking chamber is limited to a temperature at which the pyrolysis cooking appliance according to the invention can be designed much more simply and therefore more cost-effectively than comparable pyrolysis cooking appliances from the prior art. This applies in particular to the preferred embodiment of this embodiment. See also the relevant explanations at the beginning of the introductory description.Especially if it is not necessary to lock the oven door, because the thermal cleaning according to the invention makes it possible to maintain a lower oven temperature.

[0017] Another advantageous embodiment of the pyrolysis process according to the invention provides that the fan of the pyrolysis oven, which generates convection in the cooking chamber during the pyrolysis process, is switched off or operated at a lower speed compared to all other programs of the pyrolysis oven with fan assistance. Cooking appliances, including pyrolysis ovens, usually have a fan, at least for certain programs, by means of which convection is generated in the cooking chamber. With the present embodiment, it is now possible, despite desired or unavoidable convection in the cooking chamber, to reduce the convective heat transfer from the cooking chamber floor towards the two side walls, the rear wall, and the cooking chamber ceiling in such a way that the two side walls, the rear wall, and the cooking chamber ceiling are not undesirably heated convectively beyond a tolerable level.

[0018] An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows Figure 1 shows an embodiment of the pyrolysis cooking appliance according to the invention for carrying out the pyrolysis process according to the invention in a frontal view, Figure 2 shows the cooking chamber floor of the embodiment with the bottom heating device in a first transparent top view, Figure 3 shows the cooking chamber floor of the embodiment with the bottom heating device in a second transparent top view and Figure 4 shows a temperature-time diagram during a pyrolysis process using the pyrolysis process according to the present embodiment.

[0019] In the Figs. 1 to 3 is an embodiment of the pyrolysis cooking device according to the invention for carrying out the pyrolysis process according to the invention. Fig. 4 Shown purely as an example.

[0020] The pyrolytic cooking appliance 2, designed as a household oven, comprises a housing 4, a cooking chamber 14 arranged in the housing 4 and bounded by two side walls 6, a rear wall 8, a cooking chamber floor 10 and a cooking chamber ceiling 12 of the pyrolytic cooking appliance 2, a cooking chamber door 16 for closing a cooking chamber opening 18 of the cooking chamber 14 in a closed position of the cooking chamber door 16 (not shown) and for accessing the cooking chamber 14 by means of the cooking chamber opening 18 in a position shown in the Fig. 1 The oven door 16 is open in the illustrated position, and a bottom heating element 20 is arranged below the oven floor 10 of the oven 14, i.e., outside the oven 14, for heating the oven 14 during a pyrolytic cleaning process that cleans the two side walls 6, the rear wall 8, the oven ceiling 12, and the oven floor 10. The pyrolysis process is shown in the temperature-time diagram of the Fig. 4 The bottom heating element 20 is shown in more detail. Figs. 2 and 3 depicted.

[0021] According to the invention, the bottom heating device 20 is designed and arranged such that, on the one hand, the oven floor 10 can be heated to a pyrolysis temperature required for pyrolytic cleaning of the oven floor 10 during the pyrolysis process, and on the other hand, an exceedance of a lower limit temperature of an oven temperature measured in a center of the oven 14 compared to the aforementioned pyrolysis temperature is prevented, wherein the oven floor 10 has a smooth enamel surface facing the oven 14 and the two side walls 6, the rear wall 8 and the oven ceiling 12 have a catalytic surface facing the oven 14.

[0022] In the present embodiment, the bottom heating element 20 has two independently controllable heating circuits, one of which is assigned to a section of the oven floor 10 and the other to a different section of the oven floor 10, and each of which corresponds to a part of a surface of the oven floor 10 facing the oven chamber 14. For this purpose, the heating circuit designed as the inner heating circuit 22 is assigned to an inner section 26 of the oven floor 10 and the heating circuit designed as the outer heating circuit 24 is assigned to an outer section 28 of the oven floor 10 that at least partially surrounds the inner section 26, such that the inner and outer heating circuits 22, 24 are connected to a common power supply of the pyrolytic oven 2 on a common side of the bottom heating element 20.The power supply is in the . Figs. 2 and 3 The heating circuits 22 and 24 are arranged in the respective image plane below; however, they are not explicitly shown. Here, they are each designed as tubular heating elements, namely as heating coils. The external arrangement of the bottom heating device 20 for heating the cooking chamber 14 during the pyrolysis process for the pyrolytic cleaning of the cooking chamber 14, namely the two side walls 6, the rear wall 8, the cooking chamber ceiling 12, and the cooking chamber floor 10, is not only possible but also advantageous due to the inventive design of the pyrolysis cooking appliance 2 and the pyrolysis process for its pyrolytic cleaning. See the following explanations.

[0023] As already described above, the oven floor 10 has a smooth enamel surface facing the oven 14, while the two side walls 6, the rear wall 8, and the oven ceiling 12 each have a catalytic surface facing the oven 14, each of which is formed as a catalytic enamel. For this purpose, the two side walls 6, the rear wall 8, and the oven ceiling 12 are coated on their respective surfaces facing the oven 14 with a catalytic enamel layer (not shown in detail). The respective image plane of the Figs. 2 and 3This corresponds to the surface of the cooking chamber floor 10 facing the cooking chamber 14. The surface of the cooking chamber floor 10 facing the cooking chamber 14 is not only essentially smooth, but is also designed as a non-catalytically active surface. See also the relevant explanations in the introductory section of the description, particularly regarding the functional limitations of catalytically active surfaces.

[0024] Furthermore, the pyrolysis cooking appliance 2 has at least one additional heating device for heating the cooking chamber 14 during the pyrolysis process, wherein the additional heating device is designed as a top heat heating device arranged on the ceiling 12 of the cooking chamber, namely in such a way that the top heat heating device is designed as a radiant heater 30.

[0025] See the Fig. 1The radiant heater 30, like the bottom heating element 20, is a tubular heating element, specifically a coil heating element. Unlike the bottom heating element 20, the radiant heater 30 is located inside the cooking chamber 14.

[0026] The following describes the functioning of the pyrolysis cooking device and the pyrolysis process according to the present embodiment, based on the Figs. 1 to 4 explained in more detail.

[0027] For the purpose of carrying out the in the Fig. 4In the depicted pyrolysis process, the oven door 16 is in its closed position, so that the oven opening 18 and thus the oven cavity 14 are closed. There is no food being cooked in the oven cavity 14. For the pyrolytic cleaning of the oven cavity 14, namely the two side walls 6, the rear wall 8, the oven floor 10, and the oven ceiling 12, a user of the pyrolytic oven 2 (not shown) starts the pyrolysis process, i.e., the pyrolysis program, in a manner known to those skilled in the art. After the pyrolysis process has started, the oven door 16 can be locked in a manner known to those skilled in the art for the user's protection.

[0028] The oven floor 10 is now heated by means of the bottom heating device 20 in such a way that, during the pyrolysis process, the oven floor 10 is heated on the one hand to a pyrolysis temperature required for pyrolytic cleaning of the oven floor 10 and on the other hand, an exceedance of a lower limit temperature of an oven temperature measured in a center of the oven 14 compared to the aforementioned pyrolysis temperature is prevented.

[0029] For this purpose, the oven floor 10 is actively heated section by section and successively by means of the bottom heating device 20 to the pyrolysis temperature required for the oven floor 10, wherein the aforementioned pyrolysis temperature is greater than or equal to 430°C and less than or equal to 480°C. In the present embodiment, the aforementioned pyrolysis temperature is 450°C.

[0030] The aforementioned heating of the oven floor 10, namely the surface of the oven floor 10 facing the oven chamber 14, can be supported by the top heating device, namely the radiant heating 30, during the present pyrolysis process, i.e. the pyrolysis program selected here, or alternatively or additionally, if available, in at least one alternative pyrolysis program.

[0031] As can be seen from the temperature-time diagram of the Fig. 4As can be seen, each section 26, 28 of the cooking chamber floor 10 is heated to the required pyrolysis temperature only once during the pyrolysis process. Of course, pyrolysis processes according to the invention are also conceivable in which each section of the cooking chamber floor is heated to the required pyrolysis temperature several times during the pyrolysis process. For example, the pyrolysis cooking appliance according to the invention could have a plurality of different pyrolysis processes for the pyrolytic cleaning of the cooking chamber. Depending on the requirements of the individual case, i.e., depending on the degree of soiling of the cooking chamber, the user could then select between the individual pyrolysis processes. Accordingly, in the case of a lower degree of soiling of the cooking chamber, the user could select the pyrolysis process according to the Fig. 4The user could select a different pyrolysis method according to the invention in the case of heavier soiling of the cooking chamber, in which each section of the cooking chamber floor is heated several times to the pyrolysis temperature required for the cooking chamber floor during the pyrolysis process. For example, the one resulting from the Fig. 4 The visibly gradual and successive heating of the different sections of the cooking chamber floor must be repeated several times in succession.

[0032] The aforementioned and from the Fig. 4 The heating of the cooking chamber 14 is carried out in such a way that a limit temperature of 350°C is not exceeded during the pyrolysis process. In the present embodiment, the pyrolysis program is designed such that a limit temperature of 300°C is not exceeded. See the Fig. 4 As can be seen from the Fig. 4As can be seen, the pyrolysis process is divided into three time periods: a first period A for the initial heating of the cooking chamber 14, a second period B immediately following the first period A to maintain the cooking chamber temperature of 300°C measured in the center of the cooking chamber 14, and a third period C immediately following the second period B to cool the cooking chamber temperature measured in the center of the cooking chamber 14 to a temperature low enough to allow the cooking chamber 14 to be opened again, i.e., the cooking chamber door 16 to be moved from its closed position to its open position. See the following for further details: Fig. 4 the solid line that lies in the image plane of the Fig. 4as shown at the very bottom. At this cooking chamber temperature of 300°C, measured in the center of the cooking chamber 14, pyrolytic cleaning of the catalytic enamel-coated surfaces of the two side walls 6, the rear wall 8, and the cooking chamber ceiling 12 is possible. During time period A, the outer heating circuit 24 is initially switched on, so that the outer section 28 of the cooking chamber floor 10, namely the surface of the cooking chamber floor 10 facing the cooking chamber 14, is actively heated by the outer heating circuit 24 and heated to the pyrolysis temperature of 450°C. See also the corresponding Fig. 2 This pyrolysis temperature is then maintained in the outer section 28 for a predetermined period. Subsequently, the outer heating circuit 24 is controlled such that the temperature of the outer section 28 drops from 450°C to 300°C and is maintained at 300°C until the end of the second time period B. See the [reference to be added]. Fig. 4the dashed line that lies in the image plane of the Fig. 4 in the first time period A is located at the top. While the outer heating circuit 24 is controlled in the manner described above such that the temperature of the outer section 28 drops from 450°C to 300°C, the inner heating circuit 22 is simultaneously controlled such that the temperature of the inner section 26 rises from 300°C to the pyrolysis temperature of 450°C. See also the corresponding Fig. 3 Analogous to the outer heating circuit 24, the inner heating circuit 22 is subsequently controlled such that the temperature of the inner section 26, after reaching 450°C, is initially maintained at 450°C for a predetermined period and then drops from 450°C to the lower temperature required for opening the oven door 16. See the following section. Fig. 4 the dotted line, which in the first time period A in the image plane of the Fig. 4between the solid line and the dashed line. Thus, there is a first time interval I, in which the outer section 28 is actively heated by the outer heating circuit 24, and a second time interval II, in which the inner section 26 is actively heated by the inner heating circuit 22. Overall, the two aforementioned sections 26, 28 of the oven floor 10, namely the surface of the oven floor 10 facing the oven chamber 14, are actively heated section by section and successively by the bottom heating element 20, with each heating circuit 22, 24 being actively heated only once during this pyrolysis process.

[0033] As is typical, the pyrolytic oven 2 has a fan (not shown) behind the rear wall 8, which defines the cooking chamber 14. For this purpose, a perforated pattern in the form of a circle of holes is arranged approximately in the center of the rear wall 8, which is also referred to as the set rear wall. See the Fig. 1This fan of the pyrolytic oven 2, used to generate convection in the cooking chamber 14, is preferably switched off during the pyrolysis process. If this is not possible or desirable for certain reasons, this fan is operated here during the pyrolysis process at a lower speed compared to all other programs of the pyrolytic oven 2 with fan assistance. As is typical, the convection fan is surrounded by a ring heating element (not shown), so that the pyrolytic oven 2 has, in addition to the radiant heater 30, the aforementioned ring heating element as a further heating device.

[0034] Due to the inventive design of the pyrolytic cooking appliance 2 with the cooking chamber 14 and the aforementioned pyrolysis process for cleaning the cooking chamber 14, it is thus possible to adjust the surface temperature prevailing on the respective surfaces of the two side walls 6, the rear wall 8, the cooking chamber floor 10, and the cooking chamber ceiling 12 facing the cooking chamber 14 according to the different requirements for sufficient pyrolytic cleaning of these surfaces. Accordingly, the surface of the cooking chamber floor 10, which is particularly affected by soiling during the cooking processes in the cooking chamber 14, can be heated to a higher surface temperature compared to the other aforementioned surfaces, while the surface temperature of the other surfaces, which are significantly less affected by soiling during the cooking processes in the cooking chamber 14, is simultaneously limited to a lower temperature value compared to this surface temperature.Accordingly, the energy required for the pyrolysis process in Pyrolysis Oven 2 is significantly reduced compared to conventional pyrolysis ovens with a cooking chamber. Furthermore, this considerably reduces the thermal and thus also the mechanical stress on Pyrolysis Oven 2, making it significantly easier to maintain the required front and niche temperatures in Pyrolysis Oven 2, both in terms of design and manufacturing, compared to the state of the art. Additionally, the temperature resistance requirements for the electronics in Pyrolysis Oven 2 are lower compared to conventional pyrolysis ovens.

[0035] The invention is not limited to the present embodiment. See in particular the relevant explanations in the introductory section of the description as well as the optional and alternative features of the invention mentioned in the specific description section to explain the specific embodiment.

Claims

1. Pyrolytic cooking appliance (2), comprising a housing (4), a cooking chamber (14) arranged in the housing (4) and bounded by two side walls (6), a rear wall (8), a cooking chamber floor (10) and a cooking chamber ceiling (12) of the pyrolytic cooking appliance (2), a cooking chamber door (16) for closing a cooking chamber opening (18) of the cooking chamber (14) in a closed position of the cooking chamber door (16) and for accessing the cooking chamber (14) by means of the cooking chamber opening (18) in an open position of the cooking chamber door (16) and a bottom heating device (20) arranged inside or below the cooking chamber floor (10) of the cooking chamber (14) for heating the cooking chamber (14) during a pyrolytic cleaning process that pyrolytically cleans the two side walls (6), the rear wall (8), the cooking chamber ceiling (12) and the cooking chamber floor (10), characterized by the fact thatthe bottom heating device (20) is designed and arranged such that the oven floor (10) can be heated during the pyrolysis process to a pyrolysis temperature required for pyrolytic cleaning of the oven floor (10) and, on the other hand, an exceedance of a lower limit temperature of an oven temperature measured in a center of the oven (14) compared to the aforementioned pyrolysis temperature is prevented, wherein the oven floor (10) has a smooth enamel surface facing the oven (14) and the two side walls (6) and / or the rear wall (8) and / or the oven ceiling (12) have a catalytic surface facing the oven (14).

2. Pyrolysis cooking appliance (2) according to claim 1, characterized by the fact thatthe bottom heating device (20) has at least two independently controllable or steerable heating circuits, wherein at least one of the aforementioned heating circuits is assigned to a section of the cooking chamber floor (10) and at least one other of the aforementioned heating circuits is assigned to a further section of the cooking chamber floor (10) different from this section, and wherein the aforementioned sections each correspond to a part of a surface of the cooking chamber floor (10) facing the cooking chamber (14).

3. Pyrolysis cooking appliance (2) according to claim 2, characterized by the fact thatan inner heating circuit (22) is assigned to an inner section (26) of the cooking chamber floor (10) and an outer heating circuit (24) is assigned to an outer section (28) of the cooking chamber floor (10) which at least partially surrounds the inner section (26), preferably that the inner and the outer heating circuit (22, 24) are electrically connected to a common power supply of the pyrolytic cooking appliance (2) on a common side of the bottom heating device (20).

4. Pyrolysis cooking appliance (2) according to one of claims 1 to 3, characterized by the fact that the pyrolysis cooking appliance (2) has at least one further heating device for heating the cooking chamber (14) during the pyrolysis process, preferably that the further heating device is designed as an upper heat heating device arranged on the ceiling (12) of the cooking chamber, particularly preferably that the upper heat heating device is designed as a radiant heater (30).

5. Pyrolysis cooking appliance (2) according to one of claims 1 to 4, characterized by the fact that the catalytic surface of the two side walls (6) and / or the rear wall (8) and / or the cooking chamber ceiling (12) is designed as a catalytic enamel.

6. Pyrolysis method for a pyrolysis cooking appliance (2) according to one of claims 1 to 5, wherein the cooking chamber floor (10) is heated by means of the bottom heating device (20) in such a way that the cooking chamber floor (10) is heated during the pyrolysis process on the one hand to a pyrolysis temperature required for pyrolytic cleaning of the cooking chamber floor (10) and on the other hand an exceedance of a lower limit temperature of a cooking chamber temperature measured in a center of the cooking chamber (14) compared to the aforementioned pyrolysis temperature is prevented, wherein the cooking chamber floor (10) is actively heated only section by section and successively to the pyrolysis temperature required for the cooking chamber floor (10) by means of the bottom heating device (20).

7. Pyrolysis process according to claim 6, characterized by the fact that the aforementioned pyrolysis temperature is greater than or equal to 430°C and less than or equal to 480°C, preferably that the aforementioned pyrolysis temperature is 450°C.

8. Pyrolysis process according to claim 6 or 7, characterized by the fact that during the pyrolysis process each section (26, 28) of the oven floor (10) is heated only once to the pyrolysis temperature required for the oven floor (10) or that during the pyrolysis process each section of the oven floor is heated several times to the pyrolysis temperature required for the oven floor.

9. Pyrolysis process according to any one of claims 6 to 8, characterized by the fact that preferably, a limit temperature of 350°C is not exceeded during the pyrolysis process.

10. Pyrolysis process according to any one of claims 6 to 9, characterized by the fact thata fan of the pyrolytic cooking appliance (2) for generating convection in the cooking chamber (14) during the pyrolytic process is switched off or is operated at a lower speed compared to all other programs of the pyrolytic cooking appliance with fan assistance.

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