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US20080314374A1 - Cooking Appliance, Especially Top-Mounted Cooking Appliance, and Method for Controlling a Cooking Appliance - Google Patents

Cooking Appliance, Especially Top-Mounted Cooking Appliance, and Method for Controlling a Cooking Appliance Download PDF

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Publication number
US20080314374A1
US20080314374A1 US12/087,971 US8797106A US2008314374A1 US 20080314374 A1 US20080314374 A1 US 20080314374A1 US 8797106 A US8797106 A US 8797106A US 2008314374 A1 US2008314374 A1 US 2008314374A1
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US
United States
Prior art keywords
door
displacement
cooking appliance
speed
parameter
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.)
Abandoned
Application number
US12/087,971
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English (en)
Inventor
Ingo Bally
Alexander Dinkel
Kerstin Feldmann
Wolfgang Fuchs
Martin Keller
Angelika Namberger
Maximilian Neuhauser
Klemens Roch
Wolfgang Schnell
Guenter Zschau
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.)
BCH BOSCH und SIEMENS HAUSGERATE GmbH
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Assigned to BCH BOSCH UND SIEMENS HAUSGERATE GMBH reassignment BCH BOSCH UND SIEMENS HAUSGERATE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BALLY, INGO, DINKEL, ALEXANDER, FELDMANN, KERSTIN, FUCHS, WOLFGANG, KELLER, MARTIN, NAMBERGER, ANGELIKA, NEUHAUSER, MAXIMILLIAN, ROCH, KLEMENS, SCHNELL, WOLFGANG, ZSCHAU, GUENTER
Publication of US20080314374A1 publication Critical patent/US20080314374A1/en
Abandoned 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
    • 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
    • F24C15/00—Details
    • F24C15/02—Doors specially adapted for stoves or ranges
    • F24C15/027—Doors specially adapted for stoves or ranges located at bottom side of housing

Definitions

  • the invention relates to a cooking appliance, particularly a top-mounted cooking appliance, comprising at least a muffle that delimits a cooking space, and is provided with a muffle hole, a door for closing the muffle hole and a driving device which is controlled by a control device and is used for displacing the door.
  • a top-mounted cooking appliance is known from DE 102 28 140 A1 in which the jamming of objects by the bottom door may be detected by a plurality of anti-jamming switches that may be actuated independently of one another and are located between the bottom door and the muffle frame.
  • any pressure increase may be evaluated in a door seal with a hollow cross-section.
  • DE 102 88 141 A1 also describes an optoelectronic sensor for detecting a jam, which is activated by the quantity of reflected light.
  • the disadvantage of the described jam detectors is that they are either relatively slow (tensile force sensors), or imprecise and prone to error (optical force sensors) and, furthermore, require increased installation costs.
  • the main disadvantage is that the function for detecting a jammed object does not work reliably, if at all, if there is a variation in the internal parameters of the cooking appliance itself or in external factors. For example, a heavy load on the door may mean that a preset displacement speed cannot be achieved, or can only be achieved after a delay. Furthermore, using the cooking appliance in an area where the voltage fluctuates between too high and too low may result in short-term deviations. Finally, the effects of aging on the drive for the door or on guide rails may mean that an originally preset displacement speed can no longer be reached.
  • Another disadvantage is a triggering of a closing process for the door, in which—shortly before the closed state is reached—there is a changeover from an anti-jamming mechanism in which a switch or a function is used for detecting a jammed state, to a closing mechanism for registering a closed state.
  • the object of the invention is, therefore, to provide rapid, simple and precise adjustment of the cooking appliance to variable operating conditions, and—preferably—a displacement speed detector for a cooking appliance of the type described above.
  • a cooking appliance is preferred, particularly a top-mounted cooking appliance, comprising at least a muffle that delimits a cooking space, and is provided with a muffle hole, a door for closing the muffle hole and a driving device which is controlled by a control device and is used for displacing the door, wherein—during a displacement of the door—a parameter that is dependent upon said displacement of the door is detected and wherein the detected parameter is used as the reference parameter for a function of the appliance.
  • the cooking appliance and its functionalities may be advantageously adjusted to local or current operating conditions. This would enable environmental influences, as well as a non-standard operating voltage or a varying load on the door, to be taken into account as external operating conditions.
  • Internal operating conditions that may be taken into account include, for example, effects of aging of the cooking appliance itself, for example an aging drive motor or wear on guide rails for displacement of the door, so that even gradual changes such as the effects of friction may be taken into account.
  • the reference parameter is thus advantageously always approximated as closely as possible to an actual target value.
  • the latter may also be determined on the basis of other variable factors such as a motor current.
  • the reference parameter may subsequently be used as a criterion for the triggering of a function in the same displacement movement of the door. This advantageously enables a respective adjustment in particular of the displacement speed and—for example—of an anti-jamming mechanism, so that, for example, a varying load on the door may be taken into account individually for the respective displacement cycle.
  • the reference parameter may also subsequently be used as a criterion in subsequent displacement movements of the door.
  • the settings for basic parameters or for basic parameter ranges can thereby advantageously be defined when the cooking appliance is commissioned for the first time, or at periodic intervals during maintenance activities. In addition to the initial memorization of functions, this also enables the parameters thus defined to be adjusted from time to time so that even gradual changes, for example elevation speed, can be taken into account on the basis of changing frictional conditions.
  • a reference speed determined from a displacement speed may be defined as the reference parameter.
  • the reference parameter is preferably determined for this purpose after a constant displacement speed has been reached. This enables the parameter to be determined reliably during an initial acceleration phase without load-dependent acceleration effects.
  • the reference parameter may also be determined, however, after a constant acceleration has been achieved. This enables the parameter to be set at particularly early stage, so that it may be used particularly advantageously for the current displacement movement.
  • the determination of the reference parameter is alternatively defined over the entire displacement path or part thereof, e.g. it is initially determined and then subsequently adjusted to favorable effect.
  • Such an approach offers the advantage of, for example, enabling frictional effects from lifting rails and similar to be detected especially accurately and to be taken into account.
  • a jammed state may therefore advantageously be determined dependent upon the defined reference parameter. This ensures the correct functioning of safety-related functions, such as the detection of a jammed state even in variable environmental conditions, for example where the operating voltage is too high or too low, resulting in fluctuations in displacement speed.
  • the reference parameter is determined preferably by keeping a button pressed down, or—in particular—two buttons (e.g. displacement buttons) to be operated with both hands. If the buttons are released early, the process to determine the reference parameter is preferably aborted. Such a procedure is useful since, if the process is aborted early due to the release of the displacement buttons or other buttons, this prevents a reference parameter value being determined on the basis of an erroneous displacement process. Automatic operation on the basis of the parameter or reference parameter to be determined, e.g. an automatic displacement operation, is then conveniently not possible.
  • the cooking appliance which is, in particular, a top-mounted cooking appliance but may also be a cooking appliance with an oven carriage—is equipped with a speed measurement device for determining a displacement speed of the door.
  • the speed measurement device enables an object jammed by the door to be detected by monitoring of the displacement speed, wherein the displacement movement does not need to be speed-controlled, but may—for example—also be governed on a load-dependent basis via the motor voltage or motor current.
  • the displacement movement of the door is, however, advantageously also controlled on a speed-dependent—and therefore also load-dependent—basis, e.g. via a central control unit.
  • At least one end switch is available in addition, said end switch being disposed between muffle hole and/or frame, and door, wherein any activation of at least one end switch deactivates the anti-jamming device or a first type of anti-jamming mechanism, and thus terminates protective measures.
  • This end switch preferably activates with an degree of opening of less than one centimeter, in particular in a range of 4-9 mm, which is so small that no normal household objects could become jammed. If at least one end switch is activated the door is pushed with defined force—and no longer with controlled speed—onto the muffle hole. Nevertheless, it is advantageously guaranteed that the door is not unintentionally reversed on closing, but can still be reversed if an object should become jammed in the final phase of closing.
  • non-abrupt, premature stopping of the closure movement would indicate that a child's finger has become jammed, in which case the door is immediately opened again, particularly to a degree sufficient to allow the finger to be withdrawn.
  • Such non-abrupt, premature stopping of the closure movement may be detected with particular reliability by the monitoring of a speed differential value.
  • the monitoring of the displacement speed can be focused on a reduction in the displacement speed, which is uncontrolled and therefore cannot be deliberately regulated. This may occur in that a value measured by the speed measurement device deviates from a target value by a fixed or percentage value. If the deviation is above or below a defined threshold value, a jam is assumed to have occurred. For example, if the door can no longer be displaced with the set target speed because an object is preventing it from doing so, then its speed is reduced accordingly.
  • This evaluation and monitoring may be carried out—for example—in a central control device, e.g. via suitable microcontrollers.
  • the values are, of course, selected such that jam situations are not triggered by speed fluctuations caused by the normal process for the displacement of the door.
  • the anti-jamming methods described in the prior art such as motor current measurement, may also be used.
  • the speed measurement device comprises at least one sensor on a motor shaft of the drive mechanism, in particular a drive motor, by which corresponding sensor signals can be generated upon rotation of said motor shaft.
  • the sensor signals are directly or indirectly a measure of the displacement speed of the door.
  • at least one sensor is a Hall sensor which emits two sensor signals per motor shaft rotation.
  • the Hall sensor system is easy to install, fast and non-sensitive.
  • Two (partial) Hall elements are advantageously attached to the motor shaft, so that two signals are emitted for each rotation of the motor shaft. Evaluation of the timing of these signals enables a speed to be determined for the bottom door, for example via comparison tables or by conversion to real time.
  • the displacement speed is preferably detected by a time differential between the sensor signals.
  • an anti-jamming device may be provided which monitors for jam situations and/or implements any measures to be carried out in the event of a jam.
  • the anti-jamming device may be a separate device or functionally integrated into existing control circuits, e.g. into the central control circuit or into a control board or lift board.
  • the anti-jamming system or the anti-jamming device prefferably be activatable only if a target displacement value, in particular a target speed, is reached by the door. This minimizes the risk of the anti-jamming mechanism being triggered incorrectly.
  • Jammed “by” the door may mean jammed between the door and an outer limit, e.g. the work surface, or jammed between door and muffle frame or housing. Different force-time curves may be provided for each case.
  • At least one end switch is available in addition, which is disposed in the area between muffle hole or frame and door, wherein any activation of at least one end switch deactivates the anti-jamming device or anti-jamming mechanism, i.e. interrupts protective measures.
  • This end switch typically activates with a degree of opening of 4-9 mm, which is so small that no objects could still be jammed. On the other hand, this guarantees that the door is not unintentionally reversed on closing. If the at least one end switch is activated, the door is pushed with defined force—and no longer with controlled speed—onto the muffle hole.
  • the speed measurement device may, however, also be used for other purposes, such as setting the displacement speed of the door. This alone is not yet known and also is not obvious.
  • the invention is particularly suitable for top-mounted cooking appliances in which the muffle hole is at the bottom and the door is a bottom door, which preferably moves in linear fashion.
  • FIG. 1 shows a perspective view of a wall-mounted, top-mounted cooking appliance with bottom door lowered
  • FIG. 2 shows a perspective view of the top-mounted cooking appliance with bottom door closed
  • FIG. 3 shows a perspective view of a housing of the top-mounted cooking appliance without the bottom door
  • FIG. 4 shows a schematic side view in cross-section along the line I-I from FIG. 1 of the wall-mounted, top-mounted cooking appliance with bottom door lowered;
  • FIG. 5 shows the front view of a further embodiment of a top-mounted cooking appliance
  • FIGS. 6 to 11 are diagrams of displacement movements of a bottom door under various basic conditions
  • FIGS. 12 and 13 are force-time profile curves for a bottom door.
  • FIG. 14 is a diagram of a preferred displacement movement when a thin object is jammed between a bottom door and a muffle.
  • FIG. 1 shows a top-mounted cooking appliance with a housing 1 .
  • the rear side of the housing 1 is attached to a wall 2 in the manner of a hanging cupboard.
  • a cooking space 3 is delimited in the housing 1 , which may be monitored through a viewing window 4 set into the front face of the housing 1 .
  • FIG. 4 shows that the cooking space 3 is delimited by a muffle 5 , which is provided with a heat-insulating sheathing (not illustrated), and that the muffle 5 has a muffle hole 6 in the bottom surface.
  • the muffle hole 6 can be closed with a bottom door 7 .
  • the bottom door 7 is shown in a lowered state, wherein it lies with its underside on a work surface 8 of a kitchen appliance.
  • the bottom door 7 In order to close the cooking space 3 , the bottom door 7 must be adjusted to the position shown in FIG. 2 , known as the “zero position”.
  • the top-mounted cooking appliance has a drive mechanism 9 , 10 .
  • the drive mechanism 9 , 10 has a drive motor 9 , shown by dashed lines in FIGS. 1 , 2 and 4 , which is disposed between the muffle 5 and an outer wall of the housing 1 .
  • the drive motor 9 is disposed in the area of the rear face of the housing 1 , and—as shown in FIG. 1 or 4 —is effectively connected to a pair of lifting elements 10 , which are connected to the bottom door 7 .
  • FIG. 1 or 4 According to the schematic lateral view from FIG.
  • each lifting element 10 is designed as an L-shaped carrier, whereof the horizontal legs extend out from the drive motor 9 on the housing side.
  • the drive motor 9 may be activated with the help of an operating panel 12 und and a control circuit 13 , which are disposed on the front surface of the bottom door 7 in accordance with FIGS. 1 and 2 .
  • the control circuit 13 is located behind the operating panel 12 inside the bottom door 7 .
  • the control circuit 13 which is assembled in this case from several spatially and functionally separate PCBs that communicate via a communication bus, is a central control unit for operating the appliance and controls and/or regulates functions such as heating up, displacement of the bottom door 3 , implementation of user inputs, illumination, an anti-jamming mechanism, timing of the heating elements 16 , 17 , 18 , 22 , and much more.
  • FIG. 1 indicates that an upper surface of the bottom door 7 has a cooking hob 15 . Almost the entire surface of the cooking hob 15 is occupied by heating elements 16 , 17 , 18 , which are shown in FIG. 1 by dashed lines.
  • the heating elements 16 , 17 are two separate cooking zone heating elements of different sizes, whilst the heating element 18 is a flat heating element provided between the two cooking zone heating elements 16 , 17 that virtually surrounds the cooking zone heating elements 16 , 17 .
  • the cooking zone heating elements 16 , 17 define relevant cooking zones or hobs for the user; the cooking zone heating elements 16 , 17 together with the flat heating element 18 , define an under-surface heating zone. The zones may be indicated by an appropriate décor on the upper surface.
  • the heating elements 16 , 17 , 18 can each be controlled via the control circuit 13 .
  • the heating elements 16 , 17 , 18 are designed as radiant heating elements which are covered by a vitroceramic plate 19 .
  • the vitroceramic plate 19 has roughly the same dimensions as the upper surface of the bottom door 7 .
  • the vitroceramic plate 19 is, furthermore, equipped with mounting holes (not illustrated), through which extend bases for supporting the retaining parts 20 for cooking product carriers 21 , as also shown in FIG. 4 .
  • Other—preferably readily appealing—covers may also be used instead of a vitroceramic plate 19 , e.g. a thin metal sheet.
  • the top-mounted cooking appliance may be switched to hob or under-surface heating mode, as explained below.
  • the cooking zone heating elements 16 , 17 are triggered individually via the control circuit 13 by means of operating elements 11 , which are provided in the operating panel 12 , whilst the flat heating elements 18 remain out of operation.
  • the hob operating mode may be executed with the bottom door 7 lowered as shown in FIG. 1 . It may, however, also be operated with the cooking space 3 closed, with the bottom door 7 raised up in an energy-saving function.
  • the cooking hob 15 providing the heat from below has equal distribution of the heat output over the surface of the cooking hob 15 , even though the heating elements 16 , 17 , 18 have different nominal outputs.
  • the heating elements 16 , 17 , 18 are advantageously not switched to continuous operation by the control circuit 13 , but the power supply to the heating elements 16 , 17 , 18 is delivered at timed intervals. This means that the different nominal heat outputs of the heating elements 16 , 17 , 18 are reduced individually so that the heating elements 16 , 17 , 18 achieve an even distribution of heat output across the surface of the cooking hob 15 .
  • FIG. 4 is a schematic diagram showing the position of a fan 23 , e.g. for generating circulating area in a hot-air mode or for supplying cool air.
  • an upper heating element 22 which is attached to an upper side of the muffle 5 , is provided, which may be designed with one or more rings, e.g. with an inner and an outer ring. Further heating elements, such as a ring element, may also be provided between the rear wall of the housing 1 and the muffle, though such heating elements are not illustrated here for the sake of clarity.
  • the control circuit 13 may be used for setting the various operating modes, such as—for example—top heating, hot-air or rapid heating mode, by appropriate actuation and setting of the heating output of the heating elements 16 , 17 , 18 , 22 , with activation of the fan 23 if necessary.
  • the heating output may be adjusted by means of a suitable timed delivery system.
  • the cooking hob 15 may have a different design, e.g. with or without grilling zone, as a single or multi-ring warming area without hob, and so on.
  • the housing 1 has a seal 24 to the bottom door 7 .
  • the operating panel 12 is arranged mainly on the front face of the bottom door 7 .
  • other arrangements are also possible, e.g. on the front face of the housing 1 , distributed across different subpanels and/or partially on the lateral surfaces of the cooking appliance.
  • Other designs are possible.
  • the operating elements 11 are unrestricted in terms of their construction and may take the form of, for example, operating handles, toggle switches, push-buttons or membrane keys, which incorporate display elements 14 such as—for example—LED, LCD and/or touchscreen displays.
  • FIG. 5 is a schematic, not-to-scale diagram of a top-mounted cooking appliance drawn from the front, in which the bottom door 7 is opened and resting on the work surface 8 .
  • the closed state is drawn in dashed lines.
  • each displacement switch panel 25 comprises two push-buttons, namely an upper CLOSE button 25 a for displacing the bottom door 7 upward in the closing direction, and a lower OPEN button 25 b for displacing the bottom door 7 downward in the opening direction.
  • an upper CLOSE button 25 a for displacing the bottom door 7 upward in the closing direction
  • a lower OPEN button 25 b for displacing the bottom door 7 downward in the opening direction.
  • displacement switch panels 26 are located on opposite outer surfaces of the housing 1 with corresponding CLOSE buttons 26 a and OPEN buttons 26 b , as indicated by the dotted lines.
  • the control circuit 13 which is shown by a hatched line on the interior of the bottom door 7 behind the operating panel 12 , actuates the drive motor 9 so that the bottom door 7 begins to move gently, i.e. not abruptly by the drive motor 9 simply being started up, but by means of a defined ramp.
  • control circuit 13 comprises a memory unit 27 for storing at least one destination or displacement position P 0 , PE, P 1 , P 2 , PZ of the bottom door 7 , preferably with volatile memory components, e.g. DRAMs. If a destination position P 0 , P 1 , P 2 , PZ is stored, then the bottom door—after actuation of one of the buttons 25 a , 25 b or 26 a , 26 b on the displacement switch panels 25 or 26 —automatically moves in the set direction until the next destination position is reached or one of the buttons 25 a , 25 b or 26 a , 26 b is actuated again (automatic operation).
  • the lowest destination position PZ corresponds to the maximum open state
  • the (zero) position P 0 corresponds to the closed state
  • P 1 and P 2 are freely adjustable positions in between.
  • a destination position P 0 , P 1 , P 2 , PZ may be any position of the bottom door 7 between and including the zero position P 0 and the maximum open position PZ.
  • the maximum stored open position PZ need not, however, be the position resting on the work surface 8 .
  • the destination positions P 0 , P 1 , P 2 , PZ may be stored with the bottom door 7 at the required destination position P 0 , P 1 , P 2 , PZ, by pressing an actuation button 28 in the operating panel 12 —for example—for several seconds (e.g. two seconds continuously).
  • Existing optical and/or acoustic signal emitters which emit appropriate signals when a destination position is stored, are not drawn for the sake of clarity.
  • the required destination position P 0 , P 1 , P 2 , PZ to be set is reached—in this exemplary embodiment, for example—by operating the displacement switch panels 25 or 26 with both hands and manual displacement to this position.
  • Just one destination position or—as shown in this exemplary embodiment—a plurality of destination positions P 0 , P 1 , P 2 , PZ, may be stored in the memory unit 27 . If there is a plurality of destination positions P 0 , P 1 , P 2 , PZ these may be reached in succession by actuation of the corresponding displacement buttons 25 a , 25 b or 26 a , 26 b .
  • the destination position(s) may advantageously be canceled and/or overwritten. In one embodiment, for example, only one destination position may be stored in the open state, whilst the zero position P 0 is automatically detected and can be automatically reached. Alternatively, the zero position P 0 must also be stored in order to be automatically accessible.
  • one or more of the destination positions P 1 , P 2 , PZ to open the bottom door 7 by at least approx. 400 mm to approx. 540 mm (i.e. P 1 -P 0 , P 2 -P 0 , PZ-P 0 >40 cm to 54 cm).
  • the viewing window 4 is set approximately at the user's eye level or slightly below, e.g. by means of a template indicating the size of the cooking appliance.
  • the diagrams do not show an existing mains power buffering for bridging power outages of approx. 1 to 3 seconds, and preferably up to 1.5 seconds of power outage.
  • the drive motor 9 from FIG. 1 has at least one sensor unit 31 , 32 on a motor shaft 30 , arranged either in front or behind a gear unit, in order to measure a displacement path or a position and/or a speed for the bottom door 7 .
  • the sensor unit may, for example, comprise one or more induction, Hall, optical or SAW sensors, etc.
  • two Hall (partial) elements 31 are mounted on the motor shaft 30 , offset by 180°—i.e. opposite one another—and a Hall meter 32 is installed at a fixed location in this area, at a distance from the motor shaft.
  • a Hall element 31 then travels past the meter 32 when the motor shaft 30 rotates, a measurement and/or sensor signal is generated that is, in good approximation, digital. Therefore, with (for example) two Hall elements 31 , a rotation of the motor shaft 30 causes two signals to be emitted. If the timing of these signals is analyzed, e.g. the difference in time between them, then the speed vL of the bottom door 7 can be determined, for example via comparison tables or by conversion into real time in the control circuit 13 . By addition or subtraction of the measurement signals, a displacement path or position for the bottom door 7 may be determined.
  • a speed regulator may implement the speed, for example by means of a PWM-controlled power semiconductor.
  • the path measurement is automatically readjusted at each actuation by initialization of the bottom door 7 in the zero position P 0 , so that—for example—an erroneous sensor output or recording is not implemented.
  • the drive motor 9 can be operated by actuation of both displacement switch panels 25 or 26 even if the main switch 29 is deactivated.
  • a single switch for each displacement panel is also possible, e.g. a toggle switch with neutral position, which actuates only under pressure.
  • Other forms are also possible.
  • the operating elements 28 , 29 on the operating panel 12 restricted as to their type and arrangement.
  • control circuit 13 is thus flexible and not restricted, and may therefore also comprise a plurality of PCBs, e.g. a display board, a control board and a lift board, which are spatially separate.
  • PCBs e.g. a display board, a control board and a lift board
  • a 4-mm opening may be detected by end switches 33 , which deactivate an anti-jamming mechanism upon actuation. Deactivation of the anti-jamming mechanism may, however, also be possible for example by counting pulses from the sensor signals, when a count value is reached which corresponds to a final measurement of—for example—8.6 mm.
  • the anti-jamming mechanism is thus deactivated independently of such mechanical end switches 33 .
  • the top-mounted cooking appliance may also be designed without a memory unit 27 , in which case automatic operation is not possible. This may be useful for increasing user safety, e.g. protection against jamming.
  • FIG. 6 is a not-to-scale diagram showing application of the displacement speed vL of the bottom door 7 in mm/s compared to the position of the bottom door in mm from the zero position P 0 for a displacement of the bottom door 7 from the closed state
  • a stopping of the displacement movements between P 0 and PZ The curve will run in the direction of the arrow, i.e. from right to left.
  • the downward-pointing arrows situated above the curve indicate actuations of the operating panel 12 .
  • the displacement of the bottom door 7 downward starts with the two-handed actuation of the displacement switch panels 25 , 26 or of the OPEN switches 25 b or 26 b , as indicated by the perpendicular arrow on the top left.
  • the control circuit 13 controls the drive motor 9 so that the bottom door 7 starts up gently, i.e. with a defined ramp R 1 , to its target speed vL of (in this case) 50 mm/s.
  • the ramp R 1 is linear in this case.
  • the drive motor 9 is therefore not simply activated.
  • the displacement movement is therefore also load-independent, in particular it is independent of the loading of the bottom door 7 or changes in the frictional conditions of the mechanism.
  • An input variable for this purpose may be the number of rotations of the drive motor 9 . These may be measured by Hall sensors, for example.
  • the bottom door 7 travels constantly downward until it is close to the maximum opening PZ, which results from the constructively preset maximum displacement of the bottom door 7 or from the reaching of the work surface 8 .
  • the control circuit 13 detects this approach and, gently and automatically, slows down the bottom door 7 , i.e. with a defined ramp R 2 , at PZ.
  • the two ramps R 1 and R 2 may have other gradients or forms.
  • the approach to the base plate may be detected by end switches 33 and/or by monitoring of the displacement path.
  • the cooking space 3 is not opened, and the bottom door 7 is therefore not displaced from the zero position P 0 , if an anti-opening safeguard is active, i.e. if, for example, a defined temperature e.g. 425° C. or 600° F. is exceeded in the cooking space, or if a child safety feature is activated.
  • an anti-opening safeguard is active, i.e. if, for example, a defined temperature e.g. 425° C. or 600° F. is exceeded in the cooking space, or if a child safety feature is activated.
  • the bottom door 7 starts to move automatically to the position P 1 .
  • the bottom door 7 is started up gently (right-hand ramp) and slowed down automatically (left-hand ramp).
  • the slower speed level is preset, e.g. upon delivery. More than two speed levels or target speeds may also be provided; the free adjustment of target speed(s) by the user is also a possibility.
  • FIG. 8 is a not-to-scale diagram showing a displacement of the bottom door 7 from the maximum open position PZ to the zero position P 0 , i.e. to the closed state, in manual operating mode.
  • the displacement of the bottom door 7 upward starts with the two-handed actuation of the CLOSED switches 25 a and 26 a , as indicated by the perpendicular arrow on the top left.
  • the control circuit 13 detects an approach to the zero position P 0 and gently slows down the bottom door 7 in good time beforehand. Now, however, instead of moving downward directly to the zero position P 0 by means of the linear ramp, the speed-dependent control is switched to control with defined voltage 4 mm before the zero position P 0 , i.e. by supplying the motor 9 with a corresponding voltage. This enables maximum power development to be set if the drive motor 9 is blocked. This voltage varies according to the history of the displacement (loading, frictional conditions, etc.).
  • the 4 mm opening is detected by the path measurement or additionally or alternatively via the end switches 33 .
  • An anti-jamming mechanism can also be dispensed with in the range from P 0 to P 0 +4 mm.
  • the CLOSED switches 25 a , 26 a now needs to be briefly activated, as indicated by the upper perpendicular arrow.
  • the bottom door 7 then moves similarly to the manner shown in FIG. 7 , only in the other direction.
  • the braking ramp switches from a speed-controlled state to a load or closing force-controlled state for the last 4 mm opening.
  • the lift speed is monitored here, for example, by analysis of the sensor signals from the motor shaft, wherein—for example—the time between the measurement signals or pulses is analyzed.
  • the motor current is only monitored in the second instance, this being a somewhat slower method. In particular the power that may be generated by the motor 9 for displacement is limited, to prevent accidents caused by excessively severe jamming (see also FIGS.
  • the deviation from the target speed is detected by the control circuit 13 , e.g. by a speed deviation or a temporary change in speed.
  • the bottom door is thereupon reversed so that the object may be removed; a warning signal, e.g. acoustic, may also be emitted.
  • the bottom door 7 thereafter only starts up again upon renewed actuation of a displacement keypad 25 , 26 .
  • the anti-jamming mechanism may be activated only when the bottom door 7 has reached its target speed (if a displacement button 25 a , 25 b , 26 a , 26 b is first released before this, the bottom door 7 stops immediately), and, secondly, a plurality of sensor signals are analyzed, for example to obtain an average figure.
  • FIG. 11 shows the jammed state (upper perpendicular arrow) during the opening displacement of the bottom door 7 in automatic mode to a destination position P 1 , in which an object is jammed between the lower surface of the bottom door 7 and the work surface 8 .
  • the jam may be detected via two redundant end switches, which detect a particularly uneven easing of the load on the bottom door 7 , whereupon the drive motor 9 reverses.
  • the maximum permitted force-time profile (see FIGS. 12 and 13 ) is thereby not exceeded.
  • FIG. 12 shows a maximum force F in N that may be applied to the bottom door 7 in the event of a jam during the displacement in a closing direction (i.e. upward), against the elapsed time t in s as a first force-time profile FT 1 .
  • the maximum force threshold value of 100 N may also apply for other displacement situations.
  • FIG. 13 shows a maximum force F in N that may be applied to the bottom door 7 in the event of a jam during displacement in an opening direction (i.e. downward), against elapsed time t in s as a second force-time profile FT 2 .
  • time intervals and force threshold values of the force-time profiles FT 1 , FT 2 may be adjusted to the structure and other basic conditions.
  • FIG. 14 shows an exemplary displacement profile for the memorization of functions, wherein—during the displacement of the door 7 —a parameter vr dependent upon the displacement of the door 7 is determined as a reference parameter.
  • a reference speed is particularly preferred as the reference parameter vr.
  • the parameter is determined, in particular, after the cooking appliance is installed and when it is first commissioned, in order to take into account environmental influences at the place of installation. It is particularly advantageous, however, for the definition of the parameter to be repeated so that environmental influences that change over time or even internal features of the cooking appliance can also be taken into account. It is particularly advantageous for such a parameter to be memorized with each displacement of the door, particularly each time the door is raised, in order—for example—to enable a constantly variable load to be taken into account.
  • FIG. 14 shows, by way of example, a speed profile of a displacement speed vL, wherein a speed v in mm/s is shown over a current position P of the door 7 in mm.
  • a further function of the cooking appliance may be triggered depending on the displacement speed vL as an exemplary parameter.
  • a jammed state may be detected if the displacement speed is below a target displacement speed vR before an upper interim position pb is reached, after which point the door 7 is moved toward the muffle 5 with decreasing speed.
  • the deviation below a permitted minimum speed vS is preferably defined as a criterion for the emission of a jammed signal or the registering of a jammed state.
  • a fault may also generally be detected when the speed falls outside a tolerance range vT, wherein the speed tolerance range vT is likewise preferably preset dependent upon the current operating conditions.
  • the jammed state situation is drawn, in which the displacement speed vL falls off before the upper interim position pb is reached and is lower than the permitted target or minimum speed vS, as illustrated on the basis of the outlined jam-speed profile.
  • the door 7 is preferably accelerated in the opposite direction (reversed) and moved downward by an opening path s to enable a jammed object to be removed, as outlined by means of the exemplary reset-speed profile v 2 .
  • the cooking appliance may not be able to reach a normally permissible minimum speed vS, then—for functions such as, for example, the monitoring of a jammed state—it is preferable for a memorized parameter, such as the reference speed vr, to be used as the basis as the reference parameter for a target speed vR that is to be used.
  • a memorized parameter such as the reference speed vr
  • a permissible minimum speed vS and/or a speed tolerance range vT are then defined individually in each case.
  • the reference parameter in particular the target speed vR, is preferably determined after the lower interim position pa is reached, after which point the door 7 moves upward at a constant speed.
  • the reference speed vr can preferably be determined on an initial path section as a reference path sr, so that a parameter determined over such a reference path may already be used for the continued upward displacement of the door 7 .
  • the parameter is also possible for the parameter to be determined over a reference path sr* which is already within the acceleration range of the door 7 between the end position PZ and the lower interim position pa.
  • a reference path sr* which is already within the acceleration range of the door 7 between the end position PZ and the lower interim position pa.
  • the reference parameter may be determined over a greater range, possibly even over the entire displacement path.
  • the inclusion of the entire displacement path, inclusive or exclusive of acceleration or deceleration ranges, may be used in normal operation, particularly for the detection of faults or changes in the displacement conditions (friction, leverage, etc.).
  • a service signal may, for example, be emitted, which alerts the user to the need for lubrication or maintenance of guide rails or of a drive module.
  • a procedure is preferred in which an operator must keep one, or preferably two, buttons 25 a , 26 a , pressed down for the duration of the parameter setting process over a specific predefined, particularly initial, lifting path of the door 7 .
  • a user must hold down the button(s) for at least two seconds when the door is started up, enabling the appliance to reach the ramp or the lower position pa and to travel through the reference definition section sr.
  • the button(s) is/are released early, the result is that the reference value vr cannot be correctly determined, which may—for example—lead to an anti-jamming mechanism not being activated on the basis of the displacement speed vL, which is why—in turn—automatic displacement mode is not permitted. Releasing of the button therefore causes the displacement to stop and the parameter definition process to be aborted. Even in subsequent displacement movements, it is preferable for the definition of a parameter to be aborted in the event of a fault, such as—for example—a jammed state, to ensure that no parameters determined on the basis of an incorrect displacement movement are stored.
  • a fault such as—for example—a jammed state
  • the latter may also be readjusted by monitoring and adjusting it for small, systematic changes, e.g. due to variable frictional or leverage conditions, over one or more additional ranges.
  • This readjustment is preferably carried out within the range of a constant target value, e.g. in the range of a constant displacement speed.
  • a parameter may be permanently stored in the cooking appliance upon being memorized for the first time. It is useful, however, for such a parameter to be updated from time to time or even with each displacement movement, so that changing operating conditions are taken into account.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Electric Ovens (AREA)
US12/087,971 2006-01-31 2006-12-22 Cooking Appliance, Especially Top-Mounted Cooking Appliance, and Method for Controlling a Cooking Appliance Abandoned US20080314374A1 (en)

Applications Claiming Priority (3)

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DE102006004381.2 2006-01-31
DE102006004381A DE102006004381A1 (de) 2006-01-31 2006-01-31 Gargerät, insbesondere Hocheinbau-Gargerät, und Verfahren zum Steuern eines Gargeräts
PCT/EP2006/070167 WO2007087941A1 (de) 2006-01-31 2006-12-22 Gargerät, insbesondere hocheinbau-gargerät, und verfahren zum steuern eines gargeräts

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EP (1) EP1982113A1 (ru)
DE (1) DE102006004381A1 (ru)
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US10113750B2 (en) 2012-08-27 2018-10-30 BSH Hausgeräte GmbH Vapor extractor device comprising a mobile vapor extractor hood
CN112555924A (zh) * 2021-01-13 2021-03-26 广州彩珠罗家居有限公司 一种自动识别盛具材质的微波炉
CN114532832A (zh) * 2022-03-04 2022-05-27 添可智能科技有限公司 烹饪设备和加料控制方法
US20230127677A1 (en) * 2021-10-26 2023-04-27 Littelfuse, Inc. Magnetic sensing system for multiple door appliances

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ES2976637T3 (es) * 2020-04-03 2024-08-06 Electrolux Appliances AB Un medio o módulo sensor para determinar un desplazamiento, en particular un desplazamiento elástico, de un inserto en relación con un panel

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CN114532832A (zh) * 2022-03-04 2022-05-27 添可智能科技有限公司 烹饪设备和加料控制方法

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DE102006004381A1 (de) 2007-08-02
WO2007087941A1 (de) 2007-08-09
RU2008132429A (ru) 2010-03-10

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