EP3904769A1 - Appareil de cuisson avec détection électronique des erreurs de l'opérateur - Google Patents

Appareil de cuisson avec détection électronique des erreurs de l'opérateur Download PDF

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Publication number
EP3904769A1
EP3904769A1 EP21168296.8A EP21168296A EP3904769A1 EP 3904769 A1 EP3904769 A1 EP 3904769A1 EP 21168296 A EP21168296 A EP 21168296A EP 3904769 A1 EP3904769 A1 EP 3904769A1
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EP
European Patent Office
Prior art keywords
cooking
operating
control electronics
evaluation device
evaluation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21168296.8A
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German (de)
English (en)
Inventor
Helge Nelson
Ulrich Sillmen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3904769A1 publication Critical patent/EP3904769A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/085—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on baking ovens

Definitions

  • the present invention relates to an electronic control unit for operating a cooking device equipped with an on / off switch and an electronic cooking product recognition sensor system, and to a method for operating a cooking device equipped with an on / off switch and an electronic cooking product recognition sensor system with a Control electronics.
  • a cooking device which is able to determine via cameras in which insertion level there are food carriers.
  • the camera image is transmitted to a control unit.
  • electronic image processing in the control unit which has an evaluation algorithm, edge areas of food carriers are recognized. The results of the evaluation can be used when setting automatic programs.
  • a cooking device with a control device is known in which a device-side monitoring device as the food recognition sensor is used to determine which food levels and / or food spaces are unoccupied in order to then suggest on the device side where additional food should be placed. This is intended to achieve a high quality of the food to be cooked.
  • a cooking device in which the food to be cooked is optically detected by an optical sensor such as a camera.
  • the sensor signal of the optical sensor is transmitted to a control and evaluation unit and evaluated by this in order to output a warning signal if overloading of the cooking device has been detected.
  • the food recognition sensor system is used exclusively to improve the cooking process as such.
  • General operating errors by operators who do not directly relate to the cooking process are still possible.
  • the cooking appliances are ovens, steamers, microwave ovens and any combination of such appliances, regardless of whether they are household appliances or appliances for professional applications.
  • control electronics have an electronic evaluation device with a Has operating software which, via the food recognition sensor system, queries at least the query criteria as to whether the cooking space is empty and which switching status the on / off switch has, these query values form values for query criteria specified in the operating software of the evaluation device, and the evaluation device outputs a signal to the control electronics, if a combination of values of certain query criteria specified in the operating software is met during the query.
  • the food detection sensor system is not only used to improve the cooking process, but the food detection sensor system is also used to avoid operating errors by an operator.
  • cooking appliances operated in hot mode which are operated incorrectly, not only cause a waste of energy, but can also create avoidable operational risks. But even cooking appliances that are simply switched on and are not operated in hot mode can already consume electricity unnecessarily, for example through the lighting of the cooking chamber that is then switched on, ventilation of the cooking chamber for dehumidification, and the like.
  • the on / off switch means a switch whose actuation or activation switches a cooking appliance into a specific operating mode. This can be a mere activation of a simple operational readiness of the cooking device, but also the activation of a heating mode or the selection and activation of a certain operating mode of the cooking device, such as baking, grilling, automatic defrosting, keeping warm, warming plates, and the like.
  • the on / off switch does not have to be a physical, mechanically operated switch, this term is to be understood very broadly. This can also be, for example, manual, software-assisted and / or remote-controlled activation of an operating mode of the heater, for example by pressing a softkey on a display, time-controlled activation of a cooking device or the like.
  • the invention prevents an operator from forgetting to switch off the cooking appliance after use or to set the food to be cooked in the cooking space after switching on the cooking appliance.
  • the invention can be implemented easily and inexpensively in cooking appliances, since it is already used in some cooking appliances by professional users, but also in those in the consumer sector suitable food recognition sensors are installed as standard.
  • the production costs incurred in implementing the invention in a cooking appliance are then very low.
  • the food detection sensors are often camera systems that use software-supported image analysis to detect whether food has been placed in the cooking space.
  • other sensor technologies such as weighing, ultrasound, odor sensors or other technologies, or combinations of such technologies, are also possible.
  • the sensor signal output by the existing food recognition sensor system then only needs to be evaluated by suitable software that forms part of an evaluation device. Only a small amount of programming is required for this.
  • a physical computing capacity on which the software can run is also often already provided in the operating electronics present in a cooking device, so that existing device technology can also be used with regard to computing capacity to implement the invention and no additional costs arise here either.
  • the evaluation device can then consist solely of a software package that is uploaded to the control electronics of the cooking appliance.
  • query criteria specified in the operating software of the evaluation device are mentioned by way of example, but the invention is not limited to the specified query criteria.
  • Further query criteria can be defined in the operating software that are queried by the evaluation device, such as temperatures or the humidity in the cooking space, motion sensors that detect the movements of operators in the vicinity of the cooking device, time intervals measured by a timer, or the like.
  • the combinations of certain query criteria described above, which trigger a signal and which are specified in the operating software are not restricted to the combinations described for the purposes of the invention.
  • other or additional combinations of query criteria can be specified in the operating software, and if they are present, the evaluation device outputs a signal to the operating electronics.
  • the food detection sensor system reports an empty cooking space if it has detected an empty cooking space floor or an empty cooking support such as an empty baking tray or an empty grate.
  • the query regarding the query criterion as to whether the cooking space is empty it can be sufficient if only an empty cooking space floor or an empty cooking support such as an empty baking sheet or an empty grate is recognized. In these cases, it can often be correctly assumed that there is actually no food to be cooked in the cooking space.
  • the operator error detection reports itself in more cases and thus works with a higher error detection and error prevention rate, even if in individual cases a food is under a recognized baking tray.
  • the evaluation device has a timer function with which an adjustment is carried out at time intervals or with a time delay to an actuation of the on / off switch, and / or a signal is output with a time delay for an adjustment to the control electronics, or the electronic control system has a timer function with which a comparison is activated via the evaluation device and / or a warning signal or an automated circuit is activated in response to a signal from the evaluation device.
  • the avoidance of operating errors can be made more user-friendly via the timer function. It would have a disruptive effect on an operator if he were reminded to remove the food from the oven immediately after the heating function was switched off.
  • a period of time that an operator usually needs in order to carry out an operator action to be expected next is therefore sensible as an interposed time interval. It would also be annoying if an operator were reminded to switch on the heating function of the cooking appliance immediately after setting the item to be cooked.
  • an operator has deliberately not yet placed any food to be cooked in the cooking space, for example in order to wait for the cooking space to heat up to a desired operating temperature.
  • the operating software can be programmed via the timer function so that the evaluation device and / or the operating electronics only execute a warning signal or an automatic switching after a predetermined time interval, for example only when the heating phase is completed.
  • the evaluation that started the timer is repeated again in order to determine whether the event that triggered the timer function is still present. It can in case of finding a combination of certain query criteria can also be activated by the evaluation device, several timer functions, for example, after the food has been placed in the oven, a first time interval for the output of a warning signal and a second time interval, after which an automatic shutdown is carried out, if always until it is reached no food has yet been placed in the cooking space.
  • the timer function can be integrated into the operating software of the evaluation device, or the timer function is part of the operating electronics, which the evaluation device accesses with the operating software when required.
  • the food recognition sensor system has an optical sensor with software-supported automated image evaluation.
  • the optical sensor for example a camera, can be used to detect whether the image captured by the optical sensor shows a cooking chamber floor, a baking tray, a grate or a combination thereof. If only these components of the cooking appliance are recognized, the cooking space can be assumed to be "empty". However, if other objects are recognized in addition to these components of the cooking device that do not correspond to the cooking chamber floor, a tray and / or a grate, the food recognition sensor system can assume that the cooking chamber has been filled with a food to be cooked even without a specific identification of the object , and forward this result as a sensor value.
  • the optical sensor is a camera and the software-supported automated image evaluation evaluates the images created by the camera.
  • the camera can take at least one picture when the on / off switch is actuated, or a picture is only taken and evaluated after the end of a programmed time interval after actuation of the on / off switch.
  • evaluation software searches for optical features in the recorded image which are characteristic of one of the two states “cooking space empty” and "cooking space full".
  • the automated image evaluation can lead to the unambiguous assignment of the cooking appliance to the status "cooking space full" or "cooking space empty". If this assignment cannot be made unambiguously, the case with the higher probability is assumed.
  • a limit value for the probability of detection can be predetermined in order not to unnecessarily bother the user with messages, or a confirmation of the status by a classification "cooking space full” or “cooking space empty” carried out at a later point in time can be awaited.
  • a single, ambiguous state identification can be validated by two successive status identifications with the same result.
  • Machine learning methods for example trained neural networks, are usually used for the described state recognition, also known as classification. these can in particular to be learning and to learn ambiguous, unknown cases that occur with the user through the behavior of the user. As an example, an unclear state is recognized and a message is sent to the user. If this nevertheless does not intervene, but leaves the cooking appliance in the same state, the software can assume that there is no incorrect operation. If this behavior occurs several times, the software can learn this case and act in the interests of the user.
  • the image evaluation takes place as a time series evaluation with a software-assisted automated evaluation of image changes occurring in a time series.
  • the multiple images to be compared in a time series can be created in a period of 5-10 minutes, for example.
  • each image is compared with its predecessor image and an evaluation measure is calculated for the change between these two images.
  • the evaluation measure could indicate how many pixels in the image have undergone a change in brightness or color.
  • other calculations such as, for example, an optical flow, a Euclidean color distance and the like of a change measure, are also possible.
  • the cooking space can be classified as "empty".
  • a defined limit value which can typically be determined, for example, by external light flows
  • the image evaluation takes place via a software-supported automated comparison with reference images.
  • the reference images can be held in a database or in a data memory. Particularly special images and features are compared here.
  • An image can be assigned to a class - empty or full cooking space - using statistical or analytical methods such as an analysis of variance or a support vector regression.
  • the evaluation delivers good results in particular when images of both classes are available as reference images for evaluation purposes.
  • the image evaluation takes place via a neural network.
  • This method requires a particularly large number of reference images from both classes, ideally all relevant cases. These are made available via the internet via a neural network.
  • previously developed features can be used for classification, or so-called deep neural networks are used without prior feature development.
  • the evaluation device outputs a signal for an automated switching on or off of the heating function and / or the operational readiness of the cooking device as a whole in at least one specific operating program of the cooking device depending on the presence of a food in the cooking space.
  • the heating mode can be switched on automatically if an operator places a food to be defrosted in the cooking space, and / or the heating mode can also be switched off automatically again if an operator does removes food to be defrosted from the cooking space.
  • the heating mode can be switched on in the "Keeping warm” operating mode when food to be kept warm is placed in the cooking space, and / or the heating mode can be automatically switched off again in this operating mode when the food is removed again.
  • Automatic switch-off can also be provided in normal baking operation when the operator removes the food from the cooking space, so that switching off the heating function and / or the cooking appliance as a whole can no longer be forgotten.
  • FIGURE shows an exemplary embodiment of a cooking appliance according to the invention with a camera.
  • a cooking device 30 is shown as an example.
  • the cooking appliance 30 is designed here as a baking oven and has a housing 2 in which a cooking space 6 delimited by a housing wall 4 is arranged.
  • the baking oven also has a 2D camera 8 designed as a fixed focus camera as an optical sensor, an opening 4.1 for the camera 8 being formed in the housing wall 4, which is covered by a lens 10 designed as a collecting lens made of borosilicate glass.
  • a cooking space lighting 11 designed as a baking muffle light is built onto a cooking space ceiling 4.2 of the housing 4.
  • the baking muffle lamp 11 is designed here at the same time as camera lighting 11. Accordingly, the fixed focus camera 8 in the present exemplary embodiment can be constructed more simply.
  • the cooking space lighting 11 can also be arranged on a side wall or consist of a combination of ceiling and side lighting.
  • the camera 8 is designed to take internal recordings of the cooking space 6 and is arranged accordingly on the housing 2. Since the cooking space 6 is relatively wide and flat, an objective 8.1 of the camera 8 has a correspondingly large object-side opening angle.
  • the camera can also be used as a plenoptic camera, TOF camera or stereo camera, i.e. in 3D technology. Cameras designed as thermal imaging cameras are also conceivable. In addition to single images, it is also possible to record sequences of images and moving images.
  • the opening 4.1 is closed essentially gas-tight by the converging lens 10 and a seal 12 arranged between the converging lens 10 and the cooking space ceiling 4.2 of the housing wall 4 and designed as a glass fiber seal.
  • a metal gasket with or without a graphite coating can be used.
  • the vapors produced during a cooking process taking place in the cooking space 6 of a cooking product 16 placed on a cooking product carrier 14 cannot escape in an undesired manner through the opening 4.1.
  • the camera 8 can also be arranged in a lateral position or in any other position relative to the cooking chamber 6, so that it can also use these positions to take photos of the cooking chamber 6 and the dirt present therein which can be used for evaluation purposes.
  • the collecting lens 10 made of borosilicate glass and the glass silk seal 12 protect the camera 8 from substances contained in the vapor and from the high temperatures occurring during the cooking process. This is particularly important since the cooking appliance 30 is equipped as a self-cleaning cooking appliance 30, that is to say with a pyrolysis function. Far higher temperatures result in pyrolysis operation.
  • the cooking space 6 is thermally insulated from the environment in a manner known to the person skilled in the art by an essentially circumferential insulation layer 18.
  • the insulation layer 18 is only partially shown in the figure.
  • the opening 4.1 in the cooking space wall 4 is arranged here in the center of the cooking space ceiling 4.2 of the housing wall 4.
  • the opening 4.1 is kept as small as possible in order to have to break through the insulation layer 18 as little as possible at this point.
  • the opening 4.1 is shown clearly enlarged in the figure for the sake of clarity.
  • the camera 8 Due to the insulation layer 18, but also for the purpose of lower temperature stress on the camera 8 due to the thermal radiation, the camera 8 is arranged further away from the cooking chamber ceiling 4.2 and thus from the cooking chamber 6 in a cooler area of the housing 2.
  • the opening 4.1 can therefore be made so small because a converging lens 10 is used here.
  • the converging lens 10 widens the beam path of the light, symbolized in the figure by dashed lines 19, through the opening 4.1. This enables, despite the small opening 4.1, the To completely map the cooking chamber 6 in the essential areas on the images recorded with the camera 8, despite a reduced object-side opening angle of the objective 8.1 of the camera 8.
  • the image angle in the plane of the sheet shown in the figure can thus be increased from approximately 50 ° to approximately 110 °.
  • the aforementioned angle information cannot be found in the schematic representation.
  • the opening 4.1 can be arranged in the region of a top heat heater 20 in the cooking space ceiling 4.2 without the opening 4.1 and the top heat heater 20 mutually influencing one another.
  • the upper heating element 20 does not appear on the images recorded with the camera 8.
  • the cooking space lighting 11 is also arranged on the cooking space ceiling 4.2 of the cooking space wall 4 in such a way that there is no undesired interaction between the cooking space lighting 11 and the upper heating element 20.
  • the camera 8 and the converging lens 10 are additionally arranged in a cooling channel 2.1 of the housing 2.
  • the camera 8 and the converging lens 10 are in a heat transfer connection with the cooling air guided in the cooling channel 2.1.
  • the cooling channel 2.1 is designed here as an air duct 2.1 of the cooking appliance.
  • the air duct 2.1 is connected to the housing wall 4 in a flow-conducting manner by means of a flange 22 that is likewise resistant to chemicals and temperature, and the air duct 2.1 is connected to the environment in a substantially gas-tight manner.
  • the air duct 2.1 of the cooking appliance 30 is used to suck off the vapors that arise during cooking processes in the cooking space 6 from the cooking space 6 and discharge it into the open environment.
  • the vapor-air mixture is guided in the air duct 2.1 formed in the housing 2.
  • the cooking appliance is also cooled in this way.
  • the arrangement of the camera 8 and the converging lens 10 in the air duct 2.1 makes it possible to dispense with an additional active cooling device. Accordingly, the cooking appliance 30 according to the invention according to the present exemplary embodiment can be implemented with fewer components and thus more cost-effectively.
  • the individual components of the cooking appliance 30 according to the invention are partially shown at a distance from one another in the figure; see, for example, the distance between the insulation layer 18 and the cooking space ceiling 4.2 of the housing wall 4. This is only for a better overview.
  • the components of the cooking appliance 30 according to the invention are connected to one another in a manner known to a person skilled in the art, unless explicitly stated otherwise on the basis of the exemplary embodiment.
  • the camera 8 can also be designed as a plenoptic camera, TOF camera or stereo camera, that is to say using 3D technology. Cameras designed as thermal imaging cameras are also conceivable. In addition to single images, it is also possible to record sequences of images and moving images.
  • a camera image 32 recorded by the camera 8 is transmitted to the evaluation device 40, which in the exemplary embodiment is part of the control electronics 34 of the cooking appliance 30.
  • the control electronics 34 are connected to the evaluation device 40 to which the camera images 32 made by the camera 8 are transmitted.
  • the camera image 32 can in itself represent a sensor signal from a food recognition sensor system.
  • the evaluation of the camera image 32 has already taken place in the camera electronics of the camera 8, and the sensor value of the food recognition sensor system transmitted to the evaluation device 40 consists only of the information as to whether a food 16 is in the cooking space 6 or not.
  • the evaluation device 40 In addition to the sensor signal of the food recognition sensor system, the evaluation device 40 also at least queries the on / off switch 42 as to whether the cooking device 30 and / or a specific operating mode of the cooking device 30 is switched on or off. These two query criteria can be query criteria specified in the operating software 46 of the evaluation device 40. If the information obtained for the respective query criteria corresponds to a combination of values for specific query criteria predetermined in the operating software 46, then the evaluation device 40 sends a signal 44 to the operating electronics 34.
  • Additional data communication 48 between evaluation device 40 and control electronics 34 is shown via the double arrow.
  • additional data can be exchanged between the operating electronics 34 and the evaluation device 40, which relate, for example, to further sensors, information, operating inputs by an operator, remote-controlled displays or operating inputs or Internet applications with artificial intelligence or networking with other devices and systems.
  • the invention is not limited to the present embodiment.
  • the teaching according to the invention can also be used advantageously in cooking appliances other than ovens.
  • other types of cameras and generally other optical sensors can also be used as cameras.
  • the cameras or other optical sensors can also be positioned elsewhere than suggested in the above objective description, namely inside or outside the cooking space, such as in the access door to the cooking space or in front of the access door to the cooking space, such as on the cooking space facing side of a handle, and it can be used several cameras and / or optical sensors.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
EP21168296.8A 2020-04-30 2021-04-14 Appareil de cuisson avec détection électronique des erreurs de l'opérateur Pending EP3904769A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020111755 2020-04-30

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EP3904769A1 true EP3904769A1 (fr) 2021-11-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4053456A1 (fr) 2021-03-03 2022-09-07 Miele & Cie. KG Système d'appareil de cuisson
DE102022204280A1 (de) 2022-05-02 2023-11-02 BSH Hausgeräte GmbH Betreiben eines Gargeräts mit mindestens einer Garraumkamera

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016119230A1 (de) 2016-10-10 2018-04-12 Miele & Cie. Kg Gargerät und System mit einem Gargerät und einem Gargutträger
DE102016225680A1 (de) 2016-12-20 2018-06-21 Convotherm-Elektrogeräte Gmbh Verfahren zum Betrieb eines Gargeräts, insbesondere eines gewerblichen Gargeräts
DE102017119485A1 (de) 2017-08-25 2019-02-28 Rational Aktiengesellschaft Verfahren zum Erkennen einer Überladung eines Gargeräts mit Gargut sowie Gargerät
US20190110638A1 (en) * 2017-10-16 2019-04-18 Midea Group Co., Ltd Machine learning control of cooking appliances
EP3608593A1 (fr) * 2018-08-10 2020-02-12 Electrolux Appliances Aktiebolag Système de cuisson

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016119230A1 (de) 2016-10-10 2018-04-12 Miele & Cie. Kg Gargerät und System mit einem Gargerät und einem Gargutträger
DE102016225680A1 (de) 2016-12-20 2018-06-21 Convotherm-Elektrogeräte Gmbh Verfahren zum Betrieb eines Gargeräts, insbesondere eines gewerblichen Gargeräts
DE102017119485A1 (de) 2017-08-25 2019-02-28 Rational Aktiengesellschaft Verfahren zum Erkennen einer Überladung eines Gargeräts mit Gargut sowie Gargerät
US20190110638A1 (en) * 2017-10-16 2019-04-18 Midea Group Co., Ltd Machine learning control of cooking appliances
EP3608593A1 (fr) * 2018-08-10 2020-02-12 Electrolux Appliances Aktiebolag Système de cuisson

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4053456A1 (fr) 2021-03-03 2022-09-07 Miele & Cie. KG Système d'appareil de cuisson
DE102021105115A1 (de) 2021-03-03 2022-09-08 Miele & Cie. Kg Gargerätesystem
DE102022204280A1 (de) 2022-05-02 2023-11-02 BSH Hausgeräte GmbH Betreiben eines Gargeräts mit mindestens einer Garraumkamera

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