TECHNICAL FIELD
[0001] The invention relates to a monitoring device, a cooker and a monitoring method.
BACKGROUND
[0002] Although applicable to any heating device, the present invention will mainly be described
in conjunction with kitchen cookers.
[0003] When cooking, especially with liquids, the liquids may start boiling. When a liquid
like water is boiling, the level of liquid in the respective cooking vessel may rise.
If the heat transfer to the cooking vessel is not interrupted or reduced, the liquid
will eventually overflow and spill over the cooking surface.
[0004] Accordingly, there is a need for detecting a raising level of content in a cooking
device.
SUMMARY OF THE INVENTION
[0005] The present invention provides a monitoring device with the features of claim 1,
a cooker with the features of claim 11 and a monitoring method with the features of
claim 13.
[0006] Accordingly, it is provided:
A monitoring device for monitoring liquid overflow in a cooking vessel on a cooking
hob of a cooker, the monitoring device comprising a distance sensor that is arranged
over the cooking hob and that is configured to measure a content distance between
the distance sensor and a content of the cooking vessel, and a control unit that is
coupled to the distance sensor and that is configured to compare the measured content
distance to a threshold distance and to output a warning signal if the measured content
distance is smaller than the threshold distance.
[0007] Further, it is provided:
A cooker for cooking content in cooking vessels, the cooker comprising a number of
cooking hobs for accommodating the cooking vessels, and a monitoring device according
to the present invention.
[0008] Further, it is provided:
A monitoring method for monitoring liquid overflow in a cooking vessel on a cooking
hob of a cooker, the monitoring method comprising measuring a content distance between
a distance sensor and a content of the cooking vessel with an ultrasonic distance
sensor or with an optical distance sensor, comparing the measured content distance
to a threshold distance, and outputting a warning signal if the measured content distance
is smaller than the threshold distance.
[0009] The present invention is based on the fact that the level of liquid inside of a cooking
vessel will increase when the liquid starts boiling. When the liquid overflows from
the cooking vessel, the cooking surface may become dirty. In addition, it is difficult
to clean dry stains after cooking. Therefore, the present invention identifies overflow
situations and takes respective precautions.
[0010] The present invention therefore tries to detect an overflow of liquid inside of a
cooking vessel by sensing the instant liquid level. The present invention provides
the distance sensor that continuously measures the level of liquid in the cooking
vessel. To this end the distance sensor is arranged over the cooking surface of the
cooker, e.g. over a cooking hob that accommodates the cooking vessel and senses the
downward distance between the distance sensor and the content of the cooking vessel,
i.e. the content distance.
[0011] The distance sensor is coupled to a control unit and provides data representing the
measured content distance to the control unit. The data may e.g. be provided as analog
voltage or current or as digital data. The control unit will then evaluate the measured
content distance and determine an increase in the level of content in the cooking
vessel. The control unit may e.g. measure the content distance in predetermined time
intervals, once every second or once every 500 milliseconds or once every 2 seconds.
[0012] If the level of content in the cooking vessel rises such that the measured content
distance falls below the threshold distance, the control unit emits a warning signal.
This warning signal may then e.g. be provided as acoustic warning to a user.
[0013] In addition or as alternative the warning signal may also be provided to a controller
of the cooker. The controller of the cooker may then e.g. reduce the power of the
respective cooking hob. It is understood that the cooker may e.g. be an electric cooker
like e.g. an induction cooker or a resistive cooker. It is however understood, that
the cooker may be any type of cooker that allows controlled the output power of the
single cooking hobs. The cooker may therefore e.g. be a gas cooker with controllable
gas valves.
[0014] The control unit may be any type of control unit that is capable of comparing the
measured content distance to the threshold distance. In case that a fixed threshold
distance is used, the control unit may be as simple as an analog comparator, wherein
one of the comparator inputs may be coupled to a constant voltage source that defines
the threshold distance. The other comparator input may be coupled to the output of
the distance sensor, in this case an analog distance sensor. However, the control
unit may e.g. also be a processor based control unit, like e.g. a microcontroller
or microprocessor comprising a respective program with executable instructions. The
distance sensor may e.g. be coupled to the processor via an analog-to-digital converter
or a digital interface. The program may then comprise the logic to acquire the measured
content distance and compare the measured content distance with the threshold distance.
The warning signal may e.g. be provided to the user via a sound source, e.g. a beeper
that may be connected to a pin of the controller. The warning signal may be provided
to the controller of the cooker e.g. via an analog or digital data connection. The
warning signal may e.g. be a binary signal that only comprises two states that indicate
if the measured content distance is higher or lower than the threshold distance. The
warning signal may however also comprise the measured content distance. This allows
the controller of the cooker a fine grained power control. The controller may e.g.
reduce the power on the respective cooking hob according to the difference between
the measured content distance and the threshold distance.
[0015] Further embodiments of the present invention are subject of the further subclaims
and of the following description, referring to the drawings.
[0016] In an embodiment, the monitoring device may comprise a mechanical sensor movement
device that may carry the distance sensor and may be configured to translationally
move the distance sensor parallel to a surface of the cooking hob, wherein the control
unit is configured to determine the threshold distance based at least on a minimum
measured distance measured during a movement of the distance sensor over the surface
of the cooking hob.
[0017] The mechanical sensor movement device may be any kind of device that carries and
moves the distance sensor. Such a device may comprise mechanical and electrical components
that interact to provide the movement. The control of the movement may e.g. be performed
by the control unit. This allows the control unit to synchronize the measurement of
the content distance with the positioning of the distance sensor. The mechanical sensor
movement device may move the distance sensor in a plane parallel to the cooking surface
of the cooker the hobs.
[0018] During a movement of the distance sensor over the cooking hob, the distance sensor
will measure three different distances. The largest distance is the distance between
the distance sensor and the surface of the cooking hob. The smallest distance is the
distance between the upper edge or rim of the cooking vessel and the distance sensor.
The third distance will be between the largest distance and the smallest distance
and will represent the content distance.
[0019] The distance sensor may e.g. start on one end of its movement range. There the sensor
will probably measure the distance to the cooking surface or hob of the cooker. The
movement will move the distance sensor of the top edge of the cooking vessel on one
side of the cooking vessel. Here the minimum distance will be measured. Further movement
will move the distance sensor over the content of the cooking vessel. Here the content
distance will be measured. Then the distance sensor will again move over the top edge
of the cooking vessel and then the cooking surface of the cooker or hob. Therefore,
cooking vessels of any size may be used with the present invention.
[0020] It is understood, that the range of movement of the distance sensor may be larger
by a predetermined size than the outer edge or outer dimensions of the respective
cooking hob. This will make sure that the distance sensor measures the above mentioned
distances even if the cooking vessel is larger than the cooking hob.
[0021] The control unit may then use the minimum distance as a base value for calculating
the threshold distance. The aim is that the content distance stays below the minimum
distance, which represents the upper edge of the cooking vessel. This will ensure
that the content does not leak out of the cooking vessel and does not spill over the
surface of the cooker.
[0022] In another embodiment, the mechanical sensor movement device may comprise guide rails
and at least one slide and an electric drive for moving the at least one slide, wherein
the distance sensor may be arranged on the at least one slide.
[0023] A guide rail and slide system is a mechanically very stable yet simple construction
that may be efficiently used to move the distance sensor. The electric drive, e.g.
an electric motor, may e.g. drive the slide directly and be mounted on the slide or
the guide rail. As alternative, the electric drive may be coupled to the slide via
belts or via a threaded spindle.
[0024] In a further embodiment, the monitoring device may comprise a cooker hood, especially
an exhaust hood, wherein the mechanical sensor movement device may be arranged in
the cooker hood.
[0025] Exhaust hoods, also called e.g. fume extractor hoods, may be provided over the cooker
surface to extract fumes that are generated while cooking. Usually such an exhaust
hood will be provided directly over the coking surface and is therefore in the ideal
position to accommodate the distance sensor.
[0026] In an embodiment, the monitoring device may comprise one dedicated distance sensor
for every cooking hob of the cooker.
[0027] The cooker may comprise a plurality of cooking hobs, like e.g. four cooking hobs.
It is obvious, that the monitoring device should not only monitor one of the cooking
hobs. Therefore, a dedicated distance sensor may be provided for every cooking hob.
[0028] It is understood, that also one mechanical sensor movement device may be provided
for every distance sensor. As alternative, it may be possible to provide a mechanical
sensor movement device that moves a distance sensor over two or all of the hobs. A
purely linear mechanical sensor movement device may e.g. comprise a linear guide rail
that spans over two cooking hobs.
[0029] Another possible mechanical sensor movement device may be a circular mechanical sensor
movement device. Such a circular mechanical sensor movement device may e.g. comprise
a circular guide rail with a slide or a rotating element, e.g. a rod or beam that
rotates around the center of the cooker surface in a plane parallel to the cooker
surface. The radius of the movement may e.g. be such that the distance sensor moves
over the center points of all the single cooking hobs during a full turn.
[0030] In another embodiment, the control unit may be configured to determine the threshold
distance as being the sum of the minimum measured distance and a safety margin distance.
[0031] As explained above, the minimum measured distance represents the top edge or rim
of the cooking vessel. Therefore, when the measured content distance is equal to the
minimum measured distance, the content has already reached the top edge of the cooking
vessel and is about to overflow. Therefore, a safety margin distance may be added
to the minimum distance to determine the threshold distance. The safety margin distance
may comprise a predetermined constant value of e.g. 1 cm to 5 cm, e.g. 1 cm, 2 cm,
3 cm, 4 cm or 5 cm, or 5 cm to 10 cm.
[0032] The control unit may as alternative also be configured to determine the threshold
distance as being the sum of the minimum measured distance and a predetermined percentage
of the difference between the maximum measured distance and the minimum measured distance.
The difference between the maximum measured distance and the minimum measured distance
will result in the approximate height of the cooking vessel. A percentage of this
height may e.g. be used as the safety margin. The percentage may e.g. be 10%, 20%,
30%, 40% or 50%. Any value between the explicitly mentioned values is also possible.
[0033] In an embodiment, the distance sensor may comprise an ultrasonic-based distance sensor.
[0034] Ultrasonic-based distance sensors, also called ultrasonic distance sensors, emit
high frequency sound waves, e.g. in the ultrasonic frequency range that is not perceptible
to the human ear. This high frequency sound waves are sent by the ultrasonic distance
sensor in the direction of the cooker surface or the cooking vessel. When the ultrasonic
sound waves hit the obstacle, i.e. the content of the cooking vessel, the surface
of the cooker or the top edge of the cooking vessel, they are reflected back and the
sound waves are detected by the distance sensor.
[0035] The time of travel of the sound wave varies depending on the distance between the
obstacle and the distance sensor. The velocity of ultrasonic sound waves is known.
The distance information may therefore be obtained by multiplying the known speed
of the ultrasonic sound waves with half the value (because of the sound waves traveling
from the distance sensor to the content and back) of the time of travel of the ultrasonic
sound waves. As indicated above, this information may be converted into an analog
voltage or a digital value for outputting to the control unit.
[0036] The distance sensor may e.g. comprise an ultrasonic transmitter that emits the ultrasonic
sound waves and a receiver that receives the sound waves. A measurement element in
the distance sensor may then measure the time of travel of the ultrasonic sound waves.
[0037] In a further embodiment, the distance sensor may comprise an optical distance sensor,
especially a camera, especially a stereo camera, or a time of flight sensor.
[0038] The ultrasonic distance sensor mentioned above may certainly work correctly if the
cooking vessel is not covered with a lid. If a lid is provided that covers the cooking
vessel, the distance sensor may not measure through the lid.
[0039] Especially with glass lids an optical distance sensor may however measure the distance
through such a lid. A time of flight sensor may e.g. use laser light to measure the
content distance. It is understood, that a time of flight sensor may receive photons
that are reflected on the lid and photons that are reflected by the content of the
cooking vessel. The time of flight sensor may therefore be configured to register
or process only the last incoming photons, which will be the ones reflected from the
surface that is farthest away from the detector of the distance sensor, i.e. the content
of the cooking vessel.
[0040] A stereo camera may also be used to determine the distance to the content of the
cooking vessel through a glass lid on the cooking vessel. The stereo camera may comprise
two separate camera or imaging sensors for recording images of the cooking vessel
from different perspectives. A triangulation technique may then be used to determine
the content distance to the content in the cooking vessel.
[0041] In an embodiment, the control unit may be configured to detect that a cooking vessel
is placed under the distance sensor based on the measured content distance and may
automatically measure the minimum measured distance after detecting that a cooking
vessel is placed under the distance sensor.
[0042] The control unit may e.g. permanently monitor the distance that is currently measured
by the distance sensor. If this distance is the maximum distance measured during a
movement of the distance sensor, the control unit may assume that no cooking vessel
is placed on the respective hob. As soon as the measured distance decreases, the control
unit may initiate another measurement moving the distance sensor from one extreme
of the mechanical sensor movement device to the other extreme, and therefore scan
the respective hob.
[0043] In addition to monitoring if a cooking vessel is placed on the hob, the control unit
may also monitor if a cooking vessel is removed after it has been placed on the hob.
The control unit may e.g. control the distance sensor to be in the center of the cooking
hob after a cooking vessel is placed on the cooking hob. If the measured distance
in this position during a measurement is equal to the maximum distance or at least
lower than the originally measured content distance (without the content boiling),
the control unit may assume that the cooking vessel is removed. The warning signal
output may then be deactivated and the above described measurements may be performed,
if a new cooking vessel is placed on the cooking hob.
[0044] It is understood, that the monitoring device may also comprise user input elements,
like e.g. buttons or the like that may trigger the monitoring device to monitor a
cooking vessel.
[0045] After initiating the monitoring of a cooking vessel, as already indicated above,
the monitoring device, e.g. the control unit, may repeatedly monitor the content distance
in predetermined intervals.
[0046] In another embodiment, the monitoring device may comprise a communication interface
configured to couple to the cooker and receive information about active cooking hobs
of the cooker.
[0047] The communication interface of the monitoring device may be any type of interface
that serves to transmit the information about active cooking hobs of the cooker to
the monitoring device. Such an interface may e.g. be a discrete interface that comprises
for every hob a binary input. If a positive signal is provided by the cooker at that
input, the monitoring device may start monitoring the respective hob. With such an
interface the cooker need not necessarily be provided with a digital controller because
such signals may also be generated in an analog fashion. The interface may however
also comprise a digital, e.g. serial or parallel, interface that communicates the
monitoring device with the cooker.
[0048] The monitoring device may then start monitoring a hob, if the respective hob is indicated
as active.
BRIEF DESCRIPTION OF THE DRAWINGS
[0049] For a more complete understanding of the present invention and advantages thereof,
reference is now made to the following description taken in conjunction with the accompanying
drawings. The invention is explained in more detail below using exemplary embodiments,
which are specified in the schematic figures of the drawings, in which:
Fig. 1 shows a block diagram of an embodiment of a cooker according to the present
invention;
Fig. 2 shows a block diagram of an embodiment of a monitoring device according to
the present invention;
Fig. 3 shows a block diagram of another embodiment of a monitoring device according
to the present invention; and
Fig. 4 shows a flow diagram of an embodiment of a monitoring method according to the
present invention.
[0050] In the figures like reference signs denote like elements unless stated otherwise.
DETAILED DESCRIPTION OF THE DRAWINGS
[0051] Fig. 1 shows a block diagram of an embodiment of a cooker 100. The cooker 100 comprises
a controller 101 that controls four cooking hobs 102, 103, 104, 105. The cooker 100
further comprises a monitoring device 106. The monitoring device 106 comprises a distance
sensor 107. The distance sensor 107 is coupled to a control unit 109 and provides
a measured distance 108 to the control unit 109.
[0052] The cooking hobs 102, 103, 104, 105 may be used to heat up content of a cooking vessel
that is placed on a respective one of the cooking hobs 102, 103, 104, 105. The controller
101 may control the output power or heat level that is generated by the cooking hobs
102, 103, 104, 105. If liquid in a cooking vessel starts boiling, the level of liquid
in the vessel may rise.
[0053] With the help of the monitoring device 106 the rising of the liquid level may be
detected and a warning signal 111 may be output by the control unit 109. To this end,
the control unit 109 after receiving a measured distance 108 from the distance sensor
107 may compare the measured distance 108 to a threshold distance 110.
[0054] The threshold distance 110 may e.g. be predetermined. However, to provide more flexibility
and the ability to adapt the monitoring device 106 to different cooking vessels, the
threshold distance 110 may be configurable or the control unit 109 may automatically
determine the threshold distance 110. A user may e.g. indicate that a cooking vessel
is placed under the distance sensor 107. The control unit 109 may then determine the
distance 108 to the content of the cooking vessel. The control unit 109 may determine
the threshold distance 110 based on this measured distance. The control unit 109 may
e.g. add a specific amount, e.g. 1 cm, 2 cm, 3 cm, 4 cm or the like to the measured
distance 108 to determine the threshold distance 110. Another scheme for determining
the threshold distance 110 will be presented and explained with regard to Fig. 3.
[0055] The distance sensor 107 of the monitoring device 106 may e.g. be an ultrasonic-based
distance sensor 107. As explained above, ultrasonic distance sensors measure a distance
by measuring the time of travel of emitted ultrasonic sound waves. As an alternative,
the distance sensor 107 may be an optical distance sensor 107 like e.g. a stereo camera
or a time of flight sensor.
[0056] Further, although only one distance sensor 107 is shown, it is understood, that one
dedicated distance sensor 107 may be provided for every cooking hob 102, 103, 104,
105 of the cooker 100.
[0057] The monitoring device 106 further comprises an optional communication interface 112.
The communication interface 112 may be used to communicate data from the cooker 100,
i.e. the controller 101, to the monitoring device 106, i.e. the control unit 109.
The data may e.g. comprise information about active cooking hobs 102, 103, 104, 105
of the cooker 100. The data may also comprise the warning signal 111 that may be communicated
to the controller 101. The controller 101 may then e.g. lower the output power of
the respective cooking hob 102, 103, 104, 105.
[0058] Fig. 2 shows a block diagram of a monitoring device 206. The monitoring device 206
is shown without any cooker. This is to emphasize that the monitoring device 206 may
also be provided as separate device that need not necessarily be an integral part
of a cooker. Instead the monitoring device 206 may e.g. be integrated into a cooker
or exhaust hood that may be provided e.g. in a kitchen.
[0059] The monitoring device 206 comprises four distance sensors 207, 215, 216, 217 that
are coupled to a control unit 209. The control unit 209 may compare the measured distances
to the threshold distance 210. In addition, the monitoring device 206 comprises a
user input 218 that is coupled to the control unit 209.
[0060] In the monitoring device 206 every one of the distance sensors 207, 215, 216, 217
is configured to monitor one of the hobs of a cooker that is provided under the monitoring
device 206. Therefore, every one of the distance sensors 207, 215, 216, 217 separately
provides measurement values to the control unit 209. The control unit 209 may then
separately monitor the single hobs and provide separate warning signals 211 for the
different hobs. For example different audible signals may be provided as warning signals
211 that identify the respective hob. The position of the respective hob may e.g.
be provided to a user as voice output. As an alternative or in addition, the warning
signal 211 may e.g. be provided as a combined audible and visible signal. An audible
beeping signal could e.g. alert a user and a visual indication could e.g. indicate
the respective hob. For example a single signal, e.g. a light, may be provided for
every hob.
[0061] The user input 218 may be used by a user to control the monitoring device 206. The
user may e.g. activate the monitoring device 206 via the user input 218. The user
may also initiate the monitoring device 206 such that the control unit 209 measures
a distance and stores this distance as the distance to the content of the cooking
vessel without the content boiling. This stored distance may then be used as a basis
for monitoring overflow.
[0062] Fig. 3 shows a block diagram of another monitoring device, especially the distance
sensor 307 and a mechanical sensor movement device 320 that carries the distance sensor
307.
[0063] The mechanical sensor movement device 320 comprises a guide rail 321. A slide 322
is arranged on the guide rail 321 and carries the distance sensor 307. It is understood,
that any type of drive, e.g. an electric motor with a belt or a threaded spindle may
be used to drive the slide 322, although it is not separately shown.
[0064] With the mechanical sensor movement device 320 the distance sensor 307 may be moved
on a linear trajectory e.g. in a plane parallel to the cooker surface 329. The mechanical
sensor movement device 320 is positioned such that the distance sensor 307 may move
over at least one hob of the cooker surface 329. It is understood, that the mechanical
sensor movement device 320 may also be long enough to allow movement of the distance
sensor 307 over two or more adjacent hobs of the cooker surface 329.
[0065] In Fig. 3 an exemplary cooking vessel 328 is placed on the cooker surface 329. For
monitoring the content 330 of the cooking vessel 328, the monitoring device may determine
three distances on the way from one end point to the other end point of the guide
rail 321.
[0066] The first distance is the maximum measured distance 325. This distance is the distance
from the distance sensor 307 to the cooker surface 329. The second distance may be
the minimum measured distance 326, i.e. the distance between the distance sensor 307
and the top edge of the cooking vessel 328. The third distance will then be the content
distance 327, i.e. the distance between the distance sensor 307 and the content 330
in the cooking vessel 328.
[0067] The control unit of the monitoring device may then e.g. calculate the threshold distance
based on the minimum measured distance 326 or on a relationship of the maximum measured
distance 325 to the minimum measured distance 326. The difference of these values
is the approximate height of the cooking vessel 328. The difference of the minimum
measured distance 326 and the content distance 327 is the margin that is available
for the boiling content 330 until it overflows.
[0068] For sake of clarity in the following description of the method based Fig. 4 the reference
signs used above in the description of apparatus based Figs. 1 - 3 will be maintained.
[0069] Fig. 4 shows a flow diagram of an embodiment of a monitoring method for monitoring
liquid overflow in a cooking vessel 328 on a cooking hob 102, 103, 104, 105 of a cooker
100.
[0070] The monitoring method comprises measuring S1 a content distance 327 between a distance
sensor 107, 207, 215, 216, 217, 307 and a content of the cooking vessel 328 with an
ultrasonic distance sensor 107, 207, 215, 216, 217, 307 or with an optical distance
sensor 107, 207, 215, 216, 217, 307. The monitoring method also comprises comparing
S2 the measured content distance 327 to a threshold distance 110, 210, and outputting
S3 a warning signal 111, 211 if the measured content distance 327 is smaller than
the threshold distance 110, 210.
[0071] The monitoring method may comprise translationally moving the distance sensor 107,
207, 215, 216, 217, 307 parallel to a surface of the cooking hob 102, 103, 104, 105,
and determining the threshold distance 110, 210 based at least on a minimum measured
distance 326 measured during a movement of the distance sensor 107, 207, 215, 216,
217, 307 over the surface of the cooking hob 102, 103, 104, 105. The threshold distance
110, 210 may e.g. be determined as the sum of the minimum measured distance 326 and
a safety margin distance.
[0072] The monitoring method may also comprise detecting that a cooking vessel 328 is placed
under the distance sensor 107, 207, 215, 216, 217, 307 based on the measured content
distance 327. The minimum measured distance 326 may then automatically be measured
after detecting that a cooking vessel 328 is placed under the distance sensor 107,
207, 215, 216, 217, 307 again.
[0073] Although specific embodiments have been illustrated and described herein, it will
be appreciated by those of ordinary skill in the art that a variety of alternate and/or
equivalent implementations exist. It should be appreciated that the exemplary embodiment
or exemplary embodiments are only examples, and are not intended to limit the scope,
applicability, or configuration in any way. Rather, the foregoing summary and detailed
description will provide those skilled in the art with a convenient road map for implementing
at least one exemplary embodiment, it being understood that various changes may be
made in the function and arrangement of elements described in an exemplary embodiment
without departing from the scope as set forth in the appended claims and their legal
equivalents. Generally, this application is intended to cover any adaptations or variations
of the specific embodiments discussed herein.
[0074] Thus, the present invention provides a monitoring device 106, 206 for monitoring
liquid overflow in a cooking vessel 328 on a cooking hob 102, 103, 104, 105 of a cooker
100, the monitoring device 106, 206 comprising a distance sensor 107, 207, 215, 216,
217, 307 that is arranged over the cooking hob 102, 103, 104, 105 and that is configured
to measure a content distance 327 between the distance sensor 107, 207, 215, 216,
217, 307 and a content of the cooking vessel 328, and a control unit 109, 209 that
is coupled to the distance sensor 107, 207, 215, 216, 217, 307 and that is configured
to compare the measured content distance 327 to a threshold distance 110, 210 and
to output a warning signal 111, 211 if the measured content distance 327 is smaller
than the threshold distance 110, 210. Further, the present invention provides a cooker
100 and a respective monitoring method.
List of reference signs
[0075]
- 100
- cooker
- 101
- controller
- 102, 103, 104, 105
- cooking hob
- 106, 206
- monitoring device
- 107, 207, 215, 216, 217, 307
- distance sensor
- 108
- distance
- 109, 209
- control unit
- 110, 210
- threshold distance
- 111, 211
- warning signal
- 112
- communication interface
- 218
- user input
- 320
- mechanical sensor movement device
- 321
- guide rail
- 322
- slide
- 325
- maximum measured distance
- 326
- minimum measured distance
- 327
- content distance
- 328
- cooking vessel
- 329
- cooker surface
- 330
- content
- S1, S2, S3
- method steps
1. Monitoring device (106, 206) for monitoring liquid overflow in a cooking vessel (328)
on a cooking hob (102, 103, 104, 105) of a cooker (100), the monitoring device (106,
206) comprising:
a distance sensor (107, 207, 215, 216, 217, 307) that is arranged over the cooking
hob (102, 103, 104, 105) and that is configured to measure a content distance (327)
between the distance sensor (107, 207, 215, 216, 217, 307) and a content of the cooking
vessel (328), and
a control unit (109, 209) that is coupled to the distance sensor (107, 207, 215, 216,
217, 307) and that is configured to compare the measured content distance (327) to
a threshold distance (110, 210) and to output a warning signal (111, 211) if the measured
content distance (327) is smaller than the threshold distance (110, 210).
2. Monitoring device (106, 206) according to claim 1, comprising a mechanical sensor
movement device (320) that carries the distance sensor (107, 207, 215, 216, 217, 307)
and is configured to translationally move the distance sensor (107, 207, 215, 216,
217, 307) parallel to a surface of the cooking hob (102, 103, 104, 105),
wherein the control unit (109, 209) is configured to determine the threshold distance
(110, 210) based at least on a minimum measured distance (326) measured during a movement
of the distance sensor (107, 207, 215, 216, 217, 307) over the surface of the cooking
hob (102, 103, 104, 105).
3. Monitoring device (106, 206) according to claim 2, wherein the mechanical sensor movement
device (320) comprises guide rails (321) and at least one slide (322) and an electric
drive for moving the at least one slide (322), wherein the distance sensor (107, 207,
215, 216, 217, 307) is arranged on the at least one slide (322).
4. Monitoring device (106, 206) according to claim 3, comprising a cooker hood, especially
an exhaust hood, wherein the mechanical sensor movement device (320) is arranged in
the cooker hood.
5. Monitoring device (106, 206) according to any one of the preceding claims, comprising
one dedicated distance sensor (107, 207, 215, 216, 217, 307) for every cooking hob
(102, 103, 104, 105) of the cooker (100).
6. Monitoring device (106, 206) according to any one of the preceding claims 2 to 5,
wherein the control unit (109, 209) is configured to determine the threshold distance
(110, 210) as being the sum of the minimum measured distance (326) and a safety margin
distance.
7. Monitoring device (106, 206) according to any one of the preceding claims, wherein
the distance sensor (107, 207, 215, 216, 217, 307) comprises an ultrasonic-based distance
sensor (107, 207, 215, 216, 217, 307).
8. Monitoring device (106, 206) according to any one of the preceding claims 1 to 6,
wherein the distance sensor (107, 207, 215, 216, 217, 307) comprises an optical distance
sensor (107, 207, 215, 216, 217, 307), especially a camera, especially a stereo camera,
or a time of flight sensor.
9. Monitoring device (106, 206) according to any one of the preceding claims 2 to 8,
wherein the control unit (109, 209) is configured to detect that a cooking vessel
(328) is placed under the distance sensor (107, 207, 215, 216, 217, 307) based on
the measured content distance (327) and to automatically measure the minimum measured
distance (326) after detecting that a cooking vessel (328) is placed under the distance
sensor (107, 207, 215, 216, 217, 307).
10. Monitoring device (106, 206) according to any one of the preceding claims, comprising
a communication interface (112) configured to couple to the cooker (100) and receive
information about active cooking hobs (102, 103, 104, 105) of the cooker (100).
11. Cooker (100) for cooking content in cooking vessels (328), the cooker (100) comprising:
a number of cooking hobs (102, 103, 104, 105) for accommodating the cooking vessels
(328),
a monitoring device (106, 206) according to any one of the preceding claims.
12. Cooker (100) according to claim 11, comprising a controller (101) configured to control
the output power of the cooking hobs (102, 103, 104, 105) and provide an information
about active ones of the cooking hobs (102, 103, 104, 105) to the monitoring device
(106, 206).
13. Monitoring method for monitoring liquid overflow in a cooking vessel (328) on a cooking
hob (102, 103, 104, 105) of a cooker (100), the monitoring method comprising:
measuring (S1) a content distance (327) between a distance sensor (107, 207, 215,
216, 217, 307) and a content of the cooking vessel (328) with an ultrasonic distance
sensor (107, 207, 215, 216, 217, 307) or with an optical distance sensor (107, 207,
215, 216, 217, 307),
comparing (S2) the measured content distance (327) to a threshold distance (110, 210),
and
outputting (S3) a warning signal (111, 211) if the measured content distance (327)
is smaller than the threshold distance (110, 210).
14. Monitoring method according to claim 13, comprising translationally moving the distance
sensor (107, 207, 215, 216, 217, 307) parallel to a surface of the cooking hob (102,
103, 104, 105), and determining the threshold distance (110, 210) based at least on
a minimum measured distance (326) measured during a movement of the distance sensor
(107, 207, 215, 216, 217, 307) over the surface of the cooking hob (102, 103, 104,
105).
15. Monitoring method according to any one of claims 13 and 14, wherein the threshold
distance (110, 210) is determined as the sum of the minimum measured distance (326)
and a safety margin distance; and/or
wherein it is detected that a cooking vessel (328) is placed under the distance sensor
(107, 207, 215, 216, 217, 307) based on the measured content distance (327) and the
minimum measured distance (326) is automatically measured after detecting that a cooking
vessel (328) is placed under the distance sensor (107, 207, 215, 216, 217, 307).