Cooktop device

Abstract

Hob device with at least one movable heating unit (20) and at least one control unit (30), characterized in that the control unit (30) is equipped to change at least one operating parameter influencing a heating power input as a function of at least one movement parameter and to adapt at least one of the operating parameters in at least one curve range (42, 44, 46, 48, 52, 54, 56, 58, 62, 64, 66, 68) to a movement of the heating unit (20).

Description

The invention is based on a hob device according to the preamble of claim 1.Hobs with movable heating units are known. These are moved on uniform tracks and operated with constant heating powers.From the post-published document DE 10 2012 211 399 A1, a hob device with movable heating units is known, wherein at least one of the heating units is provided for heating at least two heating zones alternately in at least one first operating mode.The object of the invention is in particular to provide a device of the generic type with improved properties with respect to a uniform supply of heating power. The object is achieved according to the invention by the features of claim 1, while advantageous embodiments and developments of the invention can be found in the dependent claims.The invention is based on a hob device having at least one movable heating unit and at least one control unit.It is proposed according to the invention that the control unit is equipped to change at least one operating parameter that influences a heating power input as a function of at least one movement parameter. A "heating unit" is to be understood in particular as a unit which has at least one heating element which is provided for heating a cooking zone. A "heating element" is to be understood in particular as a component which is provided to convert an energy form, preferably electrical energy, and to introduce it as heat into a cookware item placed on a hob plate. The heating element is advantageously provided to implement a power of at least 100 W, in particular at least 500 W, advantageously at least 1 kW, particularly advantageously at least 2 kW, preferably at least 3 kW. The heating element is advantageously designed as an induction heating element. An "induction heating element" is to be understood in particular as a heating element with at least one induction heating line, which is provided to cause heating by induction effects, in particular induction of electric current and / or magnetic reversal effects, in a, preferably ferromagnetic, in particular metallic, cookware. In particular, the induction heating element is provided for the purpose of transmitting a power, in particular converting electrical energy into electromagnetic field energy, in at least one operating mode in which the induction heating element is connected to supply electronics, which is ultimately converted into heat in a cookware item. An "induction heating line" is to be understood in particular as an electrical line which is provided for carrying an electrical current which is provided for inducing induction effects in a suitable heating means. The induction heating line is preferably designed as an inductance, in particular as a coil, advantageously as a flat coil, preferably at least substantially in the form of a circular disk, alternatively in the form of an oval or a rectangle. In particular, the induction heating line, in particular with a coupled heating means, has an inductance of at least 0.1 μT, in particular at least 0.3 μT, advantageously at least 1 μT. In particular, the induction heating line, in particular without a coupled heating means, has an inductance of at most 100 mT, in particular at most 10 mT, advantageously at most 1 mT. The induction heating line is preferably provided for the purpose of being flowed through at least in an operating state by high-frequency alternating current, in particular an alternating current having a frequency of at least 1 kHz, in particular at least 3 kHz, advantageously at least 10 kHz, preferably at least 20 kHz, in particular at most 100 kHz, in particular with a current intensity of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 10 A. A "movable" heating unit is to be understood in particular as a heating unit which is provided to be changed in its position. The hob unit advantageously has at least one bearing unit which is provided for movably mounting the heating unit. The hob device advantageously has at least one actuator unit which is provided to move the heating unit. In particular, the actuator unit is provided to move the heating unit on paths predetermined by the storage unit. The actuator unit is advantageously provided for moving the heating unit on any desired paths. An "actuator unit" is to be understood in particular as a unit which has at least one actuator. An "actuator" is to be understood in particular as a component which is provided to cause a movement, preferably a linear movement and / or a rotational movement. The actuator is advantageously designed as an electric, pneumatic and / or hydraulic actuator. In particular, the actuator is formed by a motor. The actuator unit and / or the bearing unit advantageously has at least one transmission means, in particular a lever, a joint and / or a gear, in order to transmit a movement of the actuator to the heating unit. A "control unit" is to be understood in particular as an electronic unit which is preferably at least partially integrated in an open-loop and / or closed-loop control unit of a domestic appliance having the hob device and which is preferably provided for the purpose of open-loop and / or closed-loop control of at least one heating electronics and / or the actuator unit. The control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a storage unit having a control and / or regulating program stored therein, which is provided to be executed by the computing unit. A "heating power input" is to be understood in particular as a location-dependent size of a cooking zone which describes how much heating power is transmitted by a partial surface of the cooking zone, in particular is introduced into a base surface of a cookware. A "movement parameter" is to be understood in particular as a parameter which describes a movement of the heating unit. In particular, the movement parameter is formed by at least one point of a path of the movement, in particular a position during a movement. In particular, the control unit is provided for guiding the heating unit on a path, so that the heating unit at least substantially sweeps over the cooking zone. In particular, the control unit is provided for heating a cooking zone in at least one operating mode, which cooking zone deviates from a round shape, in particular is formed as a rectangle or as an oval, in particular in which the heating unit is guided on a movement path which is guided at least substantially parallel to an outline of the cooking zone to be heated. "Substantially" is to be understood in particular as a deviation of less than 30%, in particular of less than 10%, advantageously of less than 3%. A "cooking zone" is to be understood in particular as a region, in particular on a hob plate, in which a cookware item can be positioned for heating. In particular, a cooking zone is determined by a position, shape and / or size of a cookware item placed on a hob plate detected by sensors. In particular, a cooking zone is defined by operator inputs. In particular, a cooking zone is predetermined by programming and selected by an operator. In particular, planar uniform heating can be achieved.Furthermore, it is proposed according to the invention that the control unit is equipped to adapt at least one of the operating parameters in at least one curve region of a movement of the heating unit. In particular, the control unit is provided to reduce a heating power input in a curve region. A "curve region" is to be understood in particular as a region of a movement path of the heating unit, in the course of which a movement direction of the heating unit changes by at least 10°, in particular at least 25°, advantageously at least 50°, preferably at least 80°. In particular, a length of the curve region is a maximum of 20 cm, in particular a maximum of 15 cm, advantageously a maximum of 10 cm. In particular, a length of the curve region is at least 3 cm, in particular at least 6 cm, advantageously at least 9 cm. In particular, overheating in inner curve regions can be avoided.It is furthermore proposed that the control unit is equipped to adapt at least one of the operating parameters as a function of a curve radius of the movement of the heating unit. In particular, the control unit is provided to adapt the at least one operating parameter in such a way that a lower input of heating power is achieved with small curve radii than with large curve radii. In particular, overheating in inner curve regions can be avoided.It is furthermore proposed that the control unit is equipped to adapt a heating power of the heating unit in order to influence a heating power input. In particular, the control unit is provided to continuously adapt the heating power in order to avoid fluctuation peaks feedback into a supply network, in particular into a power supply network. In particular, the control unit is provided to adjust the heating power by at most 50%, in particular by at most 30%, advantageously by at most 20%, in order to keep variation peaks fed back into the supply network low. In particular, the control unit is provided to reduce the heating power in curve regions, in particular in curve regions with a small curve radius. In particular, a power input can be adapted in a simple manner.It is furthermore proposed that the control unit is equipped to adapt a movement speed of the heating unit in order to influence a heating power input. In particular, a movement speed of the heating unit is at least 0.01 m / s, in particular at least 0.05 m / s, advantageously at least 0.1 m / s. Advantageously, a movement speed of the heating unit is at most 1 m / s, in particular at most 0.5 m / s, preferably at most 0.2 m / s, in order to achieve a low volume of the system. Preferably, the heating unit moves on a periodic path, wherein the control unit is provided to select the speed of the heating unit such that a period duration, i.e. a time duration for a complete round of the periodic path, is a maximum of 25 s, in particular a maximum of 15 s, advantageously a maximum of 10 s. In particular, the control unit is provided to increase the movement speed in curve regions, in particular in curve regions with a small curve radius. In particular, a power input can be adapted in a simple manner. In particular, a strong adaptation of the heating power can be dispensed with.It is furthermore proposed that the heating unit has at least two heating elements. Advantageously, at least one of the at least two heating elements surrounds at least a major part of at least one other of the at least two heating elements. In particular, the heating elements are arranged concentrically. The heating elements are preferably mechanically coupled to one another. In particular, they are movable only jointly. It is furthermore conceivable for the heating elements to be arranged next to one another on a common carrier. In particular, it can be achieved that a large range of different cookware sizes can be heated efficiently and / or uniformly.It is furthermore proposed that the control unit is equipped to adapt a number of active heating elements of the heating unit in order to influence a heating power input. In particular, the control unit is provided to reduce a number of active heating elements in curve regions, in particular with a small curve radius. In particular, the control unit is provided to guide the heating unit on a path which deviates at least in sections from a path which leads parallel to the cooking zone contour. In particular, the control unit is provided to bring a path of the movement of the heating unit closer to an outline of the cooking zone at least in path regions which are heated by a smaller number of heating elements. In particular, the control unit is provided, in the case of a deactivation of heating elements, in particular in curve regions, to distribute at least a portion, in particular at least 10%, advantageously at least 40%, preferably at least 70%, of a heating power which was supplied by deactivated heating elements, to the further active heating elements. In particular, uniform heating, in particular of edge regions of the cooking zone, can be achieved.The control unit is advantageously equipped to adapt the at least one operating parameter in such a way that heating power inputs in different regions close to the center of a cooking zone to be heated are at least substantially the same. "Regions close to the center" are to be understood in particular as regions of the cooking zone whose points have a distance from a center point, in particular a geometric center of gravity, of the cooking zone which corresponds to a maximum of 80%, in particular a maximum of 60%, advantageously a maximum of 40%, of a radius of the cooking zone. A "radius" of the cooking zone is to be understood in particular as a radius of the smallest circle which completely encompasses the cooking zone.Further advantages are evident from the following description of the drawings. The drawing shows an embodiment of the invention. The drawings, specification and claims contain numerous features in combination. The skilled person will expediently also consider the features individually and summarize them to form meaningful further combinations.The following are shown: FIG. 1 shows a hob according to the invention in a schematic view from above, FIG. 2 shows a first operating mode with a small oval cooking zone in schematic representation, FIG. 3 shows a second operating mode with a large oval cooking zone in schematic representation, and FIG. 4 shows a third operating mode with a rectangular cooking zone in schematic representation.FIG. 1 shows a hob 10 designed as an induction hob with a hob device 12. The heating unit 20 is formed movably. The heating unit 20 is provided to be moved in a region 16, next to the heating units 13, 14, under a hob plate 18. The heating unit 20 has two heating elements 22, 24 designed as induction heating elements. The heating elements 22, 24 are arranged concentrically. The heating elements 22, 24 are each configured in the manner of a circular ring. The heating elements 22, 24 are mechanically coupled to each other. The heating elements 22, 24 are rigidly connected to one another. The heating elements 22, 24 can be operated separately from one another. Furthermore, the hob device 12 has a control unit 30, which is equipped to change an operating parameter influencing a heating power input as a function of movement parameters. The smaller heating element 22 has a diameter of 10 cm. The larger heating element 24 has a diameter of 15 cm. The hob device 12 has a sensor unit 32, which is provided to detect cookware placed on the region 16. The control unit 30 is equipped to define a cooking zone 40, 50, 60 on the basis of data from the sensor unit 32. The sensor unit 32 is formed by the heating unit 20 itself. Alternatively, it is conceivable for the sensor unit 32 to have optical, capacitive or inductive sensors.FIG. 2 shows a first operating mode of the hob device 12. The control unit 30 is equipped to heat the cooking zone 40 only with the small heating element 22. The control unit 30 is equipped to move the heating unit 20 on an oval path to sweep over a surface of the cooking zone 40. The control unit 30 is equipped to adapt operating parameters in curve regions 42, 44, 46, 48 of a movement of the heating unit 20. The control unit 30 is equipped to adapt operating parameters depending on a curve radius of the movement of the heating unit 20. The control unit 30 is equipped to adjust a heating power of the heating unit 20 in order to influence a heating power input. The control unit 30 is equipped to adjust a moving speed of the heating unit 20 to influence a heating power input. The control unit 30 is equipped to lower the heating power in curve areas 42, 46 with a small curve radius by 20% compared to the heating power in curve areas 44, 48 with a large curve radius. The control unit 30 is equipped to operate the heating unit 20 in curve areas 44, 48 with a large curve radius with a heating power that is greater than a requested heating power and in curve areas 42, 46 with a small curve radius with a heating power that is less than the requested heating power, in order to achieve the requested heating power on average. The control unit 30 is equipped to increase the movement speed in the curve areas 42, 46 with a small curve radius by 40% compared to the movement speed in the curve areas 44, 48 with a large curve radius. The control unit 30 selects speeds of the heating unit 20 such that a period is about 10 s. The control unit 30 is equipped to adapt the operating parameters in such a way that heating power inputs in different regions 43, 45, 47, 49 of the cooking zone 40 to be heated close to the center are substantially the same. Since in the curve areas 42, 46 with a small curve radius the areas 43, 47 close to the center would be heated more strongly at a constant speed and a constant heating power than comparable areas 45, 49 close to the center in the curve areas 44, 48, the described control achieves a uniform heating of the areas 43, 45, 47, 49 close to the center.As an alternative to the four curve regions 42, 44, 46, 48 proposed here, it is likewise conceivable for the control unit 30 to be equipped to continuously adapt a heating power and / or a movement speed to a current curve radius. It is furthermore conceivable that the control unit 30, especially in operating modes with a low demanded heating power, merely carries out an adaptation of the heating power or an adaptation of the movement speed.FIG. 3 shows a second operating mode of the hob device 12. The control unit 30 is equipped to adapt a number of active heating elements 22, 24 of the heating unit 20 in order to influence a heating power input. The control unit 30 is equipped to operate the heating unit 20 with two active heating elements 22, 24 in a first and third curve region 52, 56. In the first and third curve regions 52, 56, a movement takes place substantially along a longitudinal direction of the large, oval cooking zone 50 with a large curve radius. In second and fourth curve regions 54, 58 in which the heating unit 20 heats ends of the oval cooking zone 50, the control unit 30 is equipped to restrict a number of the active heating elements 22 to one. This reduces an overlap of heating power inputs in regions 55, 59 close to the center. In the second and fourth curve regions 54, 58, the control unit 30 is equipped to move the heating unit 20 on circular arcs with a small curve radius. The change between different numbers of active heating elements 22, 24 results in a shape of the movement path which deviates substantially from a shape of an oval, the shape of the cooking zone 50.Furthermore, the control unit 30 can be equipped to adjust a power of the heating unit 20 and / or a movement speed in addition to the adjustment of the number of active heating elements 22, 24. The procedures can be combined as desired.FIG. 4 shows a third operating mode of the hob device 12. A movement path of the heating unit 20 is selected such that an outer edge of the heating unit 20 is guided substantially along an outline of the cooking zone 60. The control unit 30 is equipped to adjust a heating power and a moving speed of the heating unit 20 depending on the position. The control unit 30 is equipped to lower a heating power of the heating unit 20 and to increase a moving speed of the heating unit 20 in curve regions 62, 64, 66, 68. The curve areas 62, 64, 66, 68 are determined by the diameter of the heating unit 20. The control unit 30 is equipped to operate the heating unit 20 with a heating power that is greater than a required heating power in movement ranges 63, 65, 67, 69, which are each located between two curve ranges 62, 64, 66, 68.It is furthermore conceivable that in operating modes with very narrow cooking zones, the movement regions 65, 69 fall away along narrow sides of the cooking zone 60 and the adjacent curve regions 64, 66, or 68, 62, respectively, merge with one another to form individual curve regions.Furthermore, operating modes with large rectangular cooking zones are conceivable, in which, in a manner comparable to the second operating mode, the control unit 30 is equipped to adapt a number of active heating elements 22, 24 in curve regions, together with a shape of a movement path.Furthermore, embodiments of the invention are conceivable in which a hob device according to the invention has more than one movable heating unit, which act as described above. In particular, a plurality of movable heating units are provided for the purpose of being moved on the same path, in particular offset at constant intervals over time, in order to achieve an improved heating power distribution. Furthermore, embodiments are conceivable in which a movable heating unit has more than two, for example three or four, heating elements. Heating elements and / or heating units of other sizes are also conceivable.Reference numerals denote reference numerals10 Hob 12 Hob device 13 Heating unit 14 Heating unit 16 Region 18 Hob plate 20 Heating unit 22 Heating element 24 Heating element 30 Control unit 32 Sensor unit 40 Cooking zone 42 Curve region 43 Region 44 Curve region 45 Region 46 Curve region 47 Region 48 Curve region 49 Region 50 Cooking zone 52 Curve region 54 Curve region 55 Region 56 Curve region 58 Curve region 59 Region 60 Cooking zone 62 Curve region 63 Movement region 64 Curve region 65 Movement region 66 Curve region 67 Movement region 68 Curve region 69 Movement region

Claims

Hob device having at least one movable heating unit (20) and at least one control unit (30), characterised in that the control unit (30) is equipped to change at least one operating parameter which influences a heating power input as a function of at least one movement parameter and to adapt at least one of the operating parameters in at least one curve region (42, 44, 46, 48, 52, 54, 56, 58, 62, 64, 66, 68) to a movement of the heating unit (20).Hob device according to claim 1, characterised in that the control unit (30) is equipped to adapt at least one of the operating parameters as a function of a curve radius of the movement of the heating unit (20).Hob device according to one of the preceding claims, characterised in that the control unit (30) is equipped to adapt a heating power of the heating unit (20) in order to influence a heating power input.Hob device according to one of the preceding claims, characterised in that the control unit (30) is equipped to adapt a movement speed of the heating unit (20) in order to influence a heating power input.Hob device according to one of the preceding claims, characterised in that the heating unit (20) has at least two heating elements.Hob device according to claim 5, characterised in that the control unit (30) is equipped to adapt a number of active heating elements (22, 24) of the heating unit (20) in order to influence a heating power input.Hob device according to one of the preceding claims, characterised in that the control unit (30) is equipped to adapt the at least one operating parameter in such a way that heating power inputs in different regions (43, 45, 47, 49, 55, 59) close to the centre of a cooking zone (40, 50, 60) to be heated are at least substantially the same.Hob with a hob device (12) according to one of the preceding claims.

Images