Cooking hob with a balance system and a method for adjusting the temperature of a cooking vessel

The present invention relates to a cooking hob (10) including at least two cooking zones (16, 18) and a balance system for adjusting the temperature of a cooking vessel (20) after said cooking vessel (20) has been moved from a first cooking zone (16) to a second cooking zone (18). The cooking zones (16, 18) comprise or correspond with a vessel recognition device in each case. The cooking hob (10) includes a sensor device for detecting the temperature of the first cooking zone (16). The balance system is provided for activating a boosted power level (30) at the second cooking zone (18) for an estimated time in order to compensate the energy loss (Qs) of the cooking vessel (20) during setting said cooking vessel (20) on the second cooking zone (18). The boosted power level (30) is estimated on the basis of a pre-set power level (28) of the second cooking zone (18), the temperature of the first cooking zone (16) before the cooking vessel (20) has been set on the second cooking zone (18) and an estimated time for activating the boosted power level (30). Further, the present invention relates to a method for adjusting the temperature of a cooking vessel (20) on a cooking hob (10), after said cooking vessel has been moved from one cooking zone (16) to another cooking zone (18).

The present invention relates to a cooking hob with a balance system for adjusting the temperature of a cooking vessel, after said cooking vessel has been moved from one cooking zone to another cooking zone. Further, the present invention relates to a method for adjusting the temperature of a cooking vessel on a cooking hob, after said cooking vessel has been moved from one cooking zone to another cooking zone.

During the cooking procedure there are situations, in which it would be expedient, if a cooking vessel can be moved to another cooking zone. For example, when the food stuff has to be stirred within the cooking vessel, then it is advantageous that said cooking vessel is arranged on a front cooking zone. However, when said food stuff need not be stirred again in another cooking phase and the front cooking zones are required for other cooking vessels, then the cooking vessel should be moved to a rear cooking zone. Arriving at the rear cooking zone the cooking vessel transmits a part of its energy to said rear cooking zone. Thus, the cooking vessel gets colder, although the cooking temperature should be stable. It takes a long time for obtaining the former cooking temperature again. If the cooking process ends after a calculated cooking time, then the food stuff ends is not cooked. In order to avoid this, the user has to boost the power level or to enlarge the cooking time.

DE 101 56 777 A1 discloses a cooking hob with a control unit. Said control unit allows that the setting data are transferred from one cooking zone to another cooking zone, after a cooking vessel has been moved from said one cooking zone to the other cooking zone. An automatic boost function may be activated after the movement of the cooking vessel in order to increase the power level for a predetermined time. However, only the setting data of the one cooking zone can be transferred to the other cooking zone. It is not possible to adjust different power levels for the both cooking zone.

It is an object of the present invention to provide a cooking hob and a corresponding method, which allows the movement of the cooking vessel from one cooking zone to another cooking zone, wherein said cooking vessel can be kept at a continuous temperature sequence.

The object of the present invention is achieved by the induction cooking hob according to claim1.

According to the present invention the cooking hob includes at least two cooking zones and a balance system for adjusting the temperature of a cooking vessel after said cooking vessel has been moved from a first cooking zone to a second cooking zone, wherein:the cooking zones comprise or correspond with a vessel recognition device in each case,the cooking hob includes a sensor device for detecting the temperature of the first cooking zone,the balance system is provided for activating a boosted power level at the second cooking zone for an estimated time in order to compensate the energy loss of the cooking vessel during setting said cooking vessel on the second cooking zone, andthe boosted power level is estimated on the basis of a preset power level of the second cooking zone, the temperature of the second cooking zone before the cooking vessel has been set on the second cooking zone and an estimated time for activating the boosted power level.

The main idea of the present invention is the estimation of the boosted power level on the basis of the pre-set power level, the temperature of the first cooking zone and the estimated time for activating the boosted power level, so that the cooking vessel is kept at a continuous temperature sequence. The cooking process is not disturbed by moving the cooking vessel from the first cooking zone to the second cooking zone. The temperature in the cooking vessel keeps stable. It is not necessary, that the user has to adjust manually the pre-set power level or to enlarge the time for cooking process.

According to a preferred embodiment of the present invention the cooking hob includes a sensor device for detecting the temperature of the second cooking zone. Thus, a further parameter can be considered for the estimation of the boosted power level.

Further, the cooking hob may include an electronic control unit for controlling the balance system. The electronic control unit allows a fast and reliable control of the cooking hob.

For example, the vessel recognition device may comprise inductive and/or capacitive elements. The inductive and capacitive elements allow low complexity.

Alternatively or additionally, the vessel recognition device may comprise at least one camera. In this case, only one camera would be sufficient for the whole cooking area.

The object of the present invention is further achieved by the method according to claim6.

According to the present invention the method for controlling a balance system for adjusting the temperature of a cooking vessel after said cooking vessel has been moved from a first cooking zone to a second cooking zone of a cooking hob, comprises the steps of:detecting the presence of the cooking vessel on the first cooking zone and the second cooking zone,detecting the temperature of the first cooking zone, andactivating a boosted power level at the second cooking zone for an estimated time in order to compensate the energy loss of the cooking vessel during setting said cooking vessel on the second cooking zone, whereinthe boosted power level is estimated on the basis of a preset power level of the second cooking zone, the temperature of the second cooking zone before the cooking vessel has been set on the second cooking zone and an estimated time for activating the boosted power level.

The present invention allows the estimation of the boosted power level on the basis of the pre-set power level, the temperature of the first cooking zone and the estimated time for activating the boosted power level, so that the cooking vessel is kept at a continuous temperature sequence. The cooking vessel can be moved from the first cooking zone to the second cooking zone without disturbing the cooking process.

In particular, the cooking vessel is kept at a continuous temperature sequence before, during and after the movement from the first cooking zone to the second cooking zone.

Additionally, the temperature of the second cooking zone may be detected.

Preferably, the balance system is controlled by an electronic control unit.

For example, the estimated time for activating a boosted power level is about four seconds.

Further, a factor for each boosted power level lower than a maximum boosted power level is defined. In particular, the factor depends on the pre-set power level of the second cooking zone, the temperature of the second cooking zone before the cooking vessel has been set on it and the estimated time for activating the boosted power level.

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

FIG. 1illustrates a schematic top view of a cooking hob10according to a preferred embodiment of the present invention. The cooking hob10includes a cooking area12and a control area14.

The cooking area12comprises radiant and/or induction heating elements.

The cooking area12comprises a first cooking zone16and a second cooking zone18. The cooking area12may comprise further cooking zones, which are not shown inFIG. 1. A cooking vessel20is arranged on the first cooking zone16. The first cooking zone16is activated. The second cooking zone18is in a standby mode. Further, the cooking hob10includes an electronic control unit, which is not shown inFIG. 1.

The cooking zones16and18comprise or correspond with a vessel recognition device in each case. Said vessel recognition device is provided for detecting, if the cooking vessel20is arranged on the corresponding cooking zone16or18, respectively. Further, the cooking zones16and18comprise a temperature sensor in each case. Said temperature sensor is provided for detecting the temperature of the corresponding cooking zone16or18, respectively.

When the cooking vessel20is moved from the first cooking zone16to the second cooking zone18, there is a heat transfer from the cooking vessel20to the second cooking zone18. The cooking vessel20losses heat energy, and the second cooking zone18is heated up.

In order to avoid that the cooking vessel20cools down, the power level of the second cooking zone18is boosted for a predetermined time. A boosted power level30depends on the temperature of the first cooking zone16, a pre-set power level of the second cooking zone18and said predetermined time. Additionally, the boosted power level30may depend on a detected temperature of the second cooking zone18and/or an estimated residual heat of the second cooking zone18.

For example, the predetermined time has a fixed value, wherein the boosted power level30is variable. The boosted power level30is activated only then, if a cooking vessel is detected on the second cooking zone18within a defined time range, after the cooking vessel20has been removed from the first cooking zone16.

Further, a time factor for the predetermined time is defined, if the boosted power level is lower than a maximum value. Said time factor depends on the time for setting the second cooking zone18on the boosted power level, the temperature of the second cooking zone18, before the cooking vessel20is moved on it, and a pre-set power level28.

FIG. 2illustrates schematic diagrams22and24of the temperature T and the power P as a function of time t according to the preferred embodiment of the present invention.

The diagram22relates to the temperature T of the cooking vessel20, after said cooking vessel20has been moved to the second cooking zone18. The function of the temperature T develops a bump26, after the cooking vessel20has been set on the second cooking zone18. The bump26corresponds with an energy loss QS of the cooking vessel20after setting on the second cooking zone18. A few seconds later the temperature T reaches its initial value again.

The diagram24relates to the power P of the second cooking zone18. After the cooking vessel20has been set on the second cooking zone18, the power P increases until the boosted power level30has been reached. Then, the boosted power level30is maintained for the predetermined time. After said predetermined time the power P is reduced to the pre-set power level28again.

For example, water in the cooking vessel20arranged on the first cooking zone16starts to boil. Then noodles are put into the cooking vessel20, and said cooking vessel20is moved to the second cooking zone18, wherein the pre-set power level28of the second cooking zone18is set on a smart boiling level. Without the boosted power level30the water would stop to boil and the time for cooking the noodle should be enlarged. The boosted power level30may be activated for about four seconds. Afterwards the power of the second cooking zone18is reduced to the pre-set power level28again. Now, the water with the noodles can boil on the smart level and keep its temperature.

Although an illustrative embodiment of the present invention has been described herein with reference to the accompanying drawings, it is to be understood that the present invention is not limited to that precise embodiment, and that various other changes and modifications may be affected therein by one skilled in the art without departing from the scope or spirit of the invention. All such changes and modifications are intended to be included within the scope of the invention as defined by the appended claims.

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