EP1982113A1

EP1982113A1 - Cooking appliance, especially top-mounted cooking appliance, and method for controlling a cooking appliance

Info

Publication number: EP1982113A1
Application number: EP06841595A
Authority: EP
Inventors: Angelika Namberger; Maximilian Neuhauser; Klemens Roch; Wolfgang Schnell; Günter ZSCHAU; Kerstin Feldmann; Wolfgang Fuchs; Martin Keller; Ingo Bally; Alexander Dinkel
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2006-01-31
Filing date: 2006-12-22
Publication date: 2008-10-22
Also published as: RU2008132429A; US20080314374A1; DE102006004381A1; WO2007087941A1

Abstract

The invention relates to a cooking appliance, particularly a top-mounted cooking appliance, comprising at least one muffle (5) that delimits a cooking space (3) and is provided with a muffle hole (6), at least one door (7) for closing the muffle hole (6), and a driving device (9, 10) which is controlled by a control device (13) and is used for displacing the door (7). A parameter which depends on the displacement of the door (7) is determined and is used as a reference parameter (vr) for a function of the appliance. The cooking appliance is adequately triggered according to a preferred method.

Description

Cooking appliance, in particular high-installation cooking appliance, and method for controlling a cooking appliance

The present invention relates to a cooking appliance, in particular a high-installation cooking appliance, with at least one muffle delimiting a cooking chamber, which has a muffle opening, a door for closing the muffle opening and a controlled by a control device drive means for moving the door.

From DE 10228 140 Al a high-installation cooking appliance is known in which pinching of objects on the bottom door can be detected by a plurality of independently operable anti-pinch switch between the bottom door and the muffle frame. In addition, an increase in pressure in a door seal with a hollow profile can be evaluated.

In DE 101 64239 Al a anti-trap is described, which is triggered by different tensile forces on the floor door driving traction cables. A torque sensor is also described which detects a load torque on the drive shaft of an electric motor. Tensile force sensors, piezoelectric sensors and deformation or stress / strain sensors are listed as sensors.

DE 102 88 141 A1 also describes an opto-electronic sensor for detecting a trapping case which switches over the amount of reflected light.

The disadvantage is that the Einklemmerkennungen described either either relatively sluggish (tensile force sensor) or inaccurate or error-prone (optical sensor) and also require increased installation costs.

The disadvantage is especially that the detection of pinching with a variation of internal parameters of the cooking appliance itself or external influences may not at all or not sure works. For example, a high load on the door can lead to a predetermined travel speed can not be achieved or only delayed. Also, use of the cooking appliance in an area with fluctuating, too high or too low voltage feed can cause short-term deviations occur. Ultimately, aging effects of the drive for the door or guide rails can lead to an originally specified travel speed can not be achieved.

A disadvantage is also a control of a closing operation for the door, in which shortly before reaching the closed state of a clamping backup operation in which a switch or a function for detecting a pinching state, is switched to a closing operation for detecting a closing state.

It is therefore the object of the present invention to provide a quick, simple and accurate adaptation of the cooking appliance to varying operating conditions, and preferably a travel speed detection for a cooking appliance of the type described above.

The present object is achieved by the cooking appliance having the features of patent claim 1 and a method according to claim 9.

Preference is thus given to a cooking appliance, in particular a high-installation cooking appliance, with at least one muffle a cooking chamber having a muffle opening, a door to close the Muffelöffnung and controlled by a control device drive means for moving the door, wherein during a process of the door is determined by the method of the door dependent parameter and wherein the determined parameter is used as a reference parameter for a device function. As a result, an adaptation of the cooking appliance and its functionalities to local operating conditions or to current operating conditions can be carried out in an advantageous manner. This can be taken into account environmental influences such as a non-standard operating voltage or a varying load on the door as external operating conditions. For example, aging influences of the cooking appliance itself can be taken into account as internal operating conditions, for example an aging drive motor or wearing guide rails for adjusting the door, so that even creeping changes such as frictional effects can be taken into account.

The reference parameter is preferably always approximated as close as possible to an actual setpoint. In addition to considering a speed-dependent reference parameter, it can also be determined as a function of other variable variables, such as a motor current.

The reference parameter can subsequently be used as a criterion for the activation of a function during the same movement of the door. This advantageously makes possible a respective adjustment, in particular of the travel speed and, for example, an anti-trap, so that e.g. a different load on the door can be considered individually for the respective travel cycle.

The reference parameter can subsequently also be used as a criterion for later traversing movements of the door. This advantageously makes a setting of basic parameters or

Basic parameter ranges can be specified when the cooking appliance is first put into operation or at intervals during maintenance activities. In addition to a first-time learning of functions, this also makes it possible to adapt a parameter determined in this way from time to time, so that even creeping changes, eg. B. the lifting speed due to changing friction conditions are considered.

A reference speed determined from a travel speed can be defined as the reference parameter. The determination of the reference parameter is preferably carried out after reaching a constant travel speed. This allows a safe determination of the parameter without load-dependent acceleration effects during an initial acceleration phase. However, the determination of the reference parameter can also be carried out after reaching a constant acceleration. This allows a particularly early determination of the parameter so that it can be used particularly advantageously for the instantaneous travel movement.

The determination of the reference parameter is alternatively determined over the entire travel path or a part thereof, for. B. first determined and then conveniently readjusted. Such a procedure offers the advantage of being able to determine and take into account, for example, friction effects of lifting rails and the like in a particularly reliable manner.

Advantageously, a pinching condition can be determined as a function of the specific reference parameter. This ensures that safety-relevant functions, such as the detection of a pinching condition, also function correctly under varying environmental conditions, for example too high or too low an operating voltage, and therefore varying speeds of travel.

To determine the reference parameter, it is preferable to hold down a key, in particular two keys to be operated with both-handed operation (eg traversing keys). If the keys are prematurely released, the determination of the reference parameter is preferably aborted. Such an approach is useful because in case of premature termination of the process by releasing the Traversing keys or other keys prevents a reference parameter value from being determined due to a faulty traversing operation. Favorably, no automatic operation is possible on the basis of the parameter or reference parameter to be determined, eg. B. an automatic positioning operation.

For this purpose, the cooking appliance, which is in particular a high-installation cooking appliance, but can also be a cooking appliance with a baking carriage, is equipped with a speed measuring device for determining a travel speed of the door. The speed measuring device can detect trapping on the door by monitoring the traversing speed. The traversing motion does not have to be speed-controlled, but can also be regulated, for example, as a function of the load via the motor voltage or the motor current. Advantageously, but also the traversing movement of the door speed-dependent - so also load independent - controlled or regulated, z. B. via a central control unit.

It is particularly favorable for the case of closure if there is additionally at least one limit switch which is arranged in the region between the muffle opening or frame and the door, an actuation of the at least one limit switch deactivating the anti-pinch device or a first type of anti-jamming device, So protective measures ended. This limit switch switches preferably at an Offnungsmaß of less than one centimeter, in particular in a range of 9 - 4 mm, which is so small that no common household items can be more pinched. When the at least one limit switch is actuated, the door is displaced to the muffle opening with a defined force, and not more speed-controlled. Nevertheless, it is advantageously ensured that the door, while closing, does not unintentionally reverse, but can nevertheless reverse in the event of a probable jamming of an object in the final phase of closing. In particular, the case of a non-abrupt premature stopping of the closing movement is an indication of a trapped child's finger, so that the door is opened immediately in such a case, in particular by a sufficient opening for opening out opening. Such a non-abrupt premature stopping of the closing movement can be detected particularly reliably by monitoring a speed difference value.

However, in order to avoid pinching even smaller objects or, in particular, a child's finger, it is preferable not to provide complete deactivation but to switch to a modified fuse.

This speed-based anti-jamming device has the advantage that it reacts relatively quickly, can receive accurate input data and can be implemented relatively easily without major design measures.

The monitoring of the travel speed can be at a

Reduction of the travel speed to be directed, which is uncontrolled and therefore not deliberately adjusted. This can be done so that a value measured by the speed measuring device deviates by a fixed or a percentage value from a desired value. If the deviation exceeds or falls below a certain threshold value, a trapping case is assumed. For example, a door can no longer be moved with the set target speed because an object prevents it, then their speed drops accordingly. This evaluation and monitoring can be carried out for example in a central control device, for. B. via suitable microcontroller.

Alternatively or additionally, a - usually too fast - temporal change of the traversing speed trigger the Einklemmfall, for example, if trapped the door is decelerated faster than intended. Of course, the values are chosen so that speed fluctuations caused by the control process for moving the door usually no trapping. In addition, the pinching protection methods described in the prior art can be used, such as a motor current measurement.

It is advantageous if the speed measuring device comprises at least one sensor on a motor shaft of the drive device, in particular of a drive motor, by means of which corresponding sensor signals can be generated upon rotation of the motor shaft. This allows a comparatively fast reaction. The sensor signals are directly or indirectly a measure of the travel speed of the door. Then it is particularly favorable if the at least one sensor is a Hall sensor that outputs two sensor signals per revolution of the motor shaft. The Hall sensor system is easy to install, fast and insensitive. Advantageously, two Hall (part) elements are mounted on the motor shaft, so that two signals are output during a revolution of the motor shaft. By time evaluation of these signals, a speed of the bottom door can be determined, for example via comparison tables or a real-time conversion. Preferably, the travel speed is detected by a time difference between the sensor signals.

For the stable determination of the speed, it is favorable to evaluate several, in particular more than two, sensor signals. It is also advantageous if several, in particular more than two, sensor signals are averaged.

In particular, it is advantageous if reversing the traversing direction of the door after detecting the Einklemmfalls.

For this purpose, an anti-pinch device may be present, which takes over the monitoring of the Einklemmfalls and / or an implementation of the measures to be carried out in Einklemmfalls measures. The anti-trap device may be a separate device or functionally integrated into existing control circuits, e.g. B. in the central control circuit or in a control board or an elevator board.

It is favorable if the anti-trap protection or anti-pinch protection device can be activated only when a travel setpoint, in particular a setpoint speed, of the door is reached, which reduces the risk of a false triggering of the anti-pinch protection.

To protect the object trapped on the door, a maximum force time curve through the door is advantageously not exceeded. The pinching 'at' the door includes pinching between the door and an outer boundary, z. As the countertop, as well as pinching between the door and muffle frame or housing. For both cases, different force time curves can be provided.

It is particularly favorable for the case of closing, if in addition at least one limit switch is provided, which is arranged in the area between Muffeloffnung or frame and Tur, wherein an actuation of the at least one limit switch the anti-trap device or the anti-trap deactivated, so exposing protective measures. This limit switch typically switches at an opening dimension of 4 - 9 mm, which is so small that no objects can be clamped. On the other hand, it is ensured that the door does not unintentionally reverse when closing. When the at least one limit switch is actuated, the door is displaced to the muffle opening with a defined force, and not more speed-controlled.

However, the speed measuring device can also be used for other purposes, such as setting the traversing speed of the door. This alone is not yet known and not suggested. The invention is particularly suitable for high-installation cooking appliances, in which the muffle opening is a bottom-side muffle opening, and the door is a bottom door, which preferably moves linearly.

The invention will be described in more detail below with reference to the attached schematic figures. Show it:

1 shows a perspective view of a wall-mounted high-mounted cooking appliance with lowered bottom door;

2 is a perspective view of the high-installation cooking appliance with closed bottom door.

3 is a perspective view of a housing of the high-installation cooking appliance without the bottom door.

4 shows a schematic side view in a sectional view along the line I-I from FIG. 1 of the wall mounted high-mounted cooking appliance with lowered bottom door;

5 shows a front view of another embodiment of a high-installation cooking appliance;

6 to 11 diagrams of movements of a floor door under different boundary conditions;

Figures 12 and 13 Kraftzeitprofilkurven for a bottom door. and

Fig. 14 is a diagram of a preferred movement in the

Pinching a thin object between a floor door and a muffle.

1 shows a high-installation cooking appliance with a housing 1 is shown. The back of the housing 1 is like a

Hanging cupboard mounted on a wall 2. In the housing 1, a cooking chamber 3 is defined, which has a front side in the housing. 1 introduced viewing window 4 can be controlled. In FIG. 4 it can be seen that the cooking space 3 is delimited by a muffle 5, which is provided with a heat-insulating sheath, not shown, and that the muffle 5 has a bottom-side muffle opening 6. The muffle opening 6 is closable with a bottom door 7. In Fig. 1, the bottom door 7 is shown lowered, being with its underside in contact with a worktop 8 a kitchen device. In order to close the cooking chamber 3, the bottom door 7 is in the position shown in FIG. 2, the so-called. "Zero position" to adjust. To adjust the bottom door 7, the high-installation cooking appliance has a drive device 9, 10. The drive device 9, 10 has a drive motor 9 shown in dashed lines in FIGS. 1, 2 and 4, which is arranged between the muffle 5 and an outer wall of the housing 1. The drive motor 9 is arranged in the region of the rear side of the housing 1 and is, as shown in FIGS. 1 or 4, in operative connection with a pair of lifting elements 10, which are connected to the bottom door 7. 4, each lifting element 10 is designed as an L-shaped carrier, whose vertical leg extends from the housing-side drive motor 9 To adjust the bottom door 7, the drive motor 9 can be actuated by means of a control panel 12 and a control circuit 13, which is arranged according to FIGS. 1 and 2 at the front of the bottom door 7. As shown in Fig. 4, the control circuit 13 is located behind the control panel 12 within the bottom door 7. The control circuit 13, which is composed here of several spatially and functionally separate and communicating via a communication bus circuit boards, is a central control unit for the device operation and controls and / or regulates z. As a heating, a method of the bottom door 3, a conversion of user input, a lighting, a pinch protection, a clocking of the radiator 16, 17, 18, 22 and much more.

FIG. 1 shows that an upper side of the bottom door 7 has a hob 15. Almost the entire surface of the hob 15 is occupied by radiators 16, 17, 18, which are indicated by dash-dotted lines in Fig. 1. In Fig. 1, the radiator 16, 17 are two spaced apart, different sized cooking hob, while the radiator 18 is provided between the two cooking area heaters 16,17 surface heating element, which almost encloses the cooking area heaters 16, 17. The hotplate heaters 16, 17 define for the user associated cooking zones or hobs; the hotplate heaters 16, 17 together with the surface heating element 18 define a bottom heat zone. The zones may be indicated by a suitable decoration on the surface. The radiators 16, 17, 18 are each controlled via the control circuit 13.

In the exemplary embodiment shown, the radiators 16, 17, 18 are configured as radiant heaters, which are covered by a glass ceramic plate 19. The glass-ceramic plate 19 has approximately the dimensions of the upper side of the bottom door 7. The glass-ceramic plate 19 is furthermore provided with mounting openings (not shown) through which pedestals for holding support parts 20 for food support 21 protrude, as also shown in FIG. Instead of a glass ceramic plate 19, other - preferably quick-responding - covers can be used, for. B. a thin sheet.

With the help of a control panel 12 provided in the control knob, the high-installation cooking appliance can be switched to a cooking or a bottom heat mode, which will be explained below.

In the hob mode, the cooking surface heaters 16, 17 can be controlled individually by means of control elements 11, which are provided in the control panel 12, via the control circuit 13, while the surface heating element 18 remains out of operation. The hotplate mode is executable with the bottom door 7 lowered, as shown in FIG. She can, too be operated with closed cooking chamber 3 with raised floor door 7 in an energy saving function.

In the lower heat mode, not only the hotplate heaters 16, 17 but also the flat hotplate 18 are actuated by the control device 13.

In order to achieve as even as possible Braunungsbild the food during the bottom heat, it is crucial that the bottom heat-providing hob 15 has a gleichmaßige over the surface of the hob 15 distribution of Heizleistungabgabe, although the radiator 16, 17, 18 have different rated power. Preferably, therefore, the radiators 16, 17, 18 are not switched by the control circuit 13 to a continuous operation, but the power supply to the radiators 16, 17, 18 is clocked. The different sized nominal heating powers of the radiator 16, 17, 18 are individually reduced so that the radiator 16, 17, 18 provide a gleichmaßige over the surface of the hob 15 distribution of the heat output.

Fig. 4 shows schematically the position of a fan 23, z. B. for generating circulating air in a hot air operation or for supplying fresh air. In addition, a mounted on an upper side of the muffle 5 Oberhitzeheizkorper 22 is provided, the single-circuit or mehrkreisig, z. B. with an inner and an outer circle, can be executed. Also can - not shown here for clarity - another radiator such as a Ringheizkorper between the rear wall of the housing 1 and the muffle be present. By the control circuit 13, the various operating modes, such as, for example, top heat, hot air or Schnellaufheizbetrieb by an appropriate activation and adjustment of the heating power of the radiator 16, 17, 18, 22, possibly with activation of the fan 23, are set. The adjustment of the heating power can be done by appropriate timing. In addition, the hob 15 can also be designed differently, for. B. with or without frying zone, as pure - one or more circular - warming zone without cooktops and so on. The housing 1 has a seal 24 towards the bottom door 7.

The control panel 12 is mainly at the front of the

Bottom door 7 is arranged. There are alternatively other arrangements conceivable, for. B. at the front of the housing 1, divided into different sub-fields and / or partially on side surfaces of the cooking appliance. Further designs are possible. The control elements 11 are not limited in their design and can, for. B. z. As control knob, toggle switch, pushbuttons and membrane keys include the display elements 14 include z. B. LED, LCD and / or touchscreen displays.

In Fig. 5 is schematically and not to scale a high-mounted cooking appliance shown from the front, in which the bottom door 7 is open on contact with the worktop 8. The closed state is shown in dashed lines.

In this embodiment, two traversing panels 25 are located on the front side of the fixed housing 1. Each traversing panel 25 comprises two pushbuttons, namely an upper CLOSE button 25a for a bottom door 7 traveling upwards in the closing direction and a lower OPEN button 25b for one Without automatic operation (see below) moves the bottom door 7 only by continuous simultaneous pressing the CLOSE buttons 25a both traversing panels 25 upwards, if possible; also moves the bottom door 7 only by continuous simultaneous pressing of the UP buttons 25b both traversing panels 25 down, if possible (manual operation). Since in manual operation an increased operator attention of the user is given and also both hands are used here, an anti-trap is then optional. In an alternative embodiment, traversing panels 26 are mounted on opposite outer sides of the housing 1 with corresponding ZU buttons 26a and UP buttons 26b, as shown in dotted lines. The dot-dashed control circuit 13, which is located inside the bottom door 7 behind the control panel 12, the drive motor 9 so that the bottom door 7 gently approach, ie not abruptly by simply hiring the drive motor 9, but by means of a defined ramp.

In this exemplary embodiment, the control circuit 13 comprises a memory unit 27 for storing at least one destination or travel position PO, PE, P1, P2, PZ of the bottom door 7, preferably with volatile memory modules, eg. B. DRAMs. If a target position PO, Pl, P2, PZ is stored, the bottom door can move independently after pressing one of the keys 25a, 25b and 26a, 26b of the movement panels 25 and 26 in the set direction until the next target position is reached or one of the buttons 25a, 25b or 26a, 26b is pressed again (automatic mode). In this embodiment, the lowest target position PZ corresponds to the maximum opening, the (zero) position PO to the closed state, and Pl and P2 are freely adjustable intermediate positions. Is the last

In addition, the target position for one direction must be continued in manual mode if this is possible (ie the last end positions do not correspond to a maximum open or closed end state). Analog must then, if for one direction no target position is stored - which z. B. for an upward movement in the closed position would be the case if only PZ is stored, but not PO, Pl, P2 - be driven in this direction in manual mode. If no target position is stored, eg. For example, in a new installation or after a power disconnection, no automatic operation is possible. If the bottom door 7 is moved in particular in automatic mode, an anti-pinch protection is preferably activated.

Automatic operation and manual operation are not mutually exclusive: by constantly using the travel panels 25, 26, the floor door 7 also travels in the manual mode Operation if a target position could be approached in this direction. It can be z. B. a maximum actuation time of the traversing fields 25 and 26, respectively, the associated keys 25a, 25b and 26a, 26b, are set to activate the automatic mode, z. B. 0.4 seconds.

A target position PO, Pl, P2, PZ may be any position of the floor door 7 between and including the zero position PO and the maximum opening position PZ. However, the maximum stored opening position PZ does not have to be the position with abutment on the worktop 8. Storing the target position PO, P1, P2, PZ can be performed with the bottom door 7 at the desired target position PO, P1, P2, PZ, by means of, for example, several seconds (eg two seconds), actuating a confirmation key 28 in the control panel 12 be performed. Existing optical and / or acoustic signal transmitters which output corresponding signals after storing a target position are not shown for the sake of clarity. Approaching the desired target position PO, Pl, P2, PZ to be set takes place, for example, by - in this exemplary embodiment - two-handed operation of the movement panels 25 or 26 and manual method to this position.

In the memory unit 27, only one or, as shown in this exemplary embodiment, also a plurality of target positions PO, Pl, P2, PZ can be stored einspeicherbar. In the case of a plurality of target positions PO, P1, P2, PZ, these can be successively started by actuating the corresponding travel keys 25a, 25b or 26a, 26b. By several target positions PO, Pl, P2, PZ let the

Easy-to-install cooking appliance can be conveniently adapted to the desired operating height of several users. The target position (s) are advantageously erasable and / or overridden. In one embodiment, for example, only one target position in the opened state can be stored, while the zero position PO is automatically detected and can be automatically approached. Alternatively, the must Zero position PO are stored to be automatically approachable.

It is particularly advantageous for ergonomic use if the or a target position Pl, P2, PZ opens the bottom door 7 at least about 400 mm to about 540 mm (ie P1-P0, P2-P0, PZ-PO> 40cm to 54 cm). In this Offnungsmaß the Garguttrager 21 are easily inserted into the support members 20. It is advantageous if the viewing window 4 is mounted approximately at eye level of the user or something below, z. B. by means of a template that indicates the dimensions of Gargerats.

Not shown is an existing Netzausfalluberbruckung for Uberbruckung of about 1 to 3 s power failure, preferably up to 1.5 s power failure.

The drive motor 9 from FIG. 1 has at least one sensor unit 31, 32 arranged on a motor shaft 30, possibly in front of or behind a transmission, in order to measure a travel path or a position and / or a speed of the bottom door 7. The

Sensor unit may comprise, for example, one or more induction, Hall, opto, SAW sensors and so on. Here are for easy distance and speed measurement here two Hall (part) elements 31 offset by 180 ° - ie opposite - attached to the motor shaft 30, and a Hallmessaufnehmer 32 is fixedly mounted at this area of the motor shaft spaced. If a Hall element 31 then passes by the measuring transducer 32 when the motor shaft 30 rotates, a measuring or sensor signal is generated which is, to a good approximation, digital. With (not necessarily) two Hall elements 31, therefore, two signals are output during one revolution of the motor shaft 30. By time evaluation of these signals, z. B. their time difference, the speed vL of the bottom door 7 can be determined, for example via comparison tables or a conversion in real time in the control circuit 13. By addition or subtraction of the measurement signals, a travel or a position of the bottom door 7 can be determined. A speed control can realize the speed, for example via a PWM-controlled power semiconductor.

For zero point determination, the distance measurement is automatically re-adjusted by initialization in the zero position PO of the bottom door 7 at each start, so z. B. a faulty sensor signal output or -aufnähme not traditional.

The drive motor 9 is operated by actuation of both traversing panels 25 and 26, even when the main switch 29 is turned off.

Instead of two separate switches per traversing field 25, 26 and a single switch per traversing field is possible, for. B. a toggle switch with a neutral position, which switches only under pressure. Other shapes are possible. Also, the type and arrangement of the controls 28,29 of the control panel 12 is not limited.

The arrangement and distribution of the control circuit 13 is flexible and not limited, so it can be several boards, z. B. include a display board, a control board and an elevator board, which are spatially separated.

A z. B. 4 mm- Offnungsmaß can be detected by limit switch 33, which deactivate an anti-trapping when actuated. It is possible to deactivate the anti-pinch protection but e.g. also by counting pulses of the sensor signals upon reaching a count value which corresponds to a closed amount of e.g. 8.6 mm corresponds. The deactivation of the anti-trap protection is thereby independent of such mechanical limit switches 33.

The high-installation cooking appliance can also be designed without a storage unit 27, in which case no automatic operation is possible. This can be for increased operating safety, eg. B. as protection against pinching, be useful.

6 shows a diagram, not to scale, of a plot of the travel speed vL of the floor door 7 in mm / s against the position of the floor door in mm from the zero position PO for a movement of the floor door 7 from the closed state at PO = 0 mm to PZ = maximum Opening here at 530 mm in manual travel mode (ie without automatic procedure) and, as indicated by the dotted arrow, stopping the movement between PO and PZ. The curve is traversed in the direction of the arrow, ie from right to left. The downward arrows present above the curve indicate actuations of the control panel 12.

The traversing movement of the bottom door 7 downward begins with both hands Betatigen the traversing panels 25, 26 and the ON-switch 25b and 26b, as indicated by the upper left vertical arrow. The control circuit 13 controls the drive motor 9 so that the bottom door 7 gently, d. h .: with a defined ramp Rl, is approached to their target speed of here vL = 50 mm / s. The ramp Rl is linear here. The drive motor 9 is therefore not simply turned on.

The movement is thereby load independent, in particular independent of the load of the bottom door 7 or changed Reibverhaltnissen the mechanics. An input for this can be the speed of the drive motor 9, the z. B. can be measured by Hall sensors.

After reaching the target speed of vL = 50 mm / s, the bottom door 7 constantly descends until it approaches the maximum opening PZ, which results from the design-dictated maximum travel of the floor door 7 or reaching the worktop 8. In this figure, it is assumed that the constructive maximum opening PZ is achieved. In this case, the control circuit 13 recognizes this approach and brakes the bottom door 7 automatically smoothly, ie with a defined ramp R2, down to PZ. Both ramps R1 and R2 may have other slopes or shapes. The approach to the bottom plate can be detected by limit switch 33 and / or by monitoring the travel.

If one or both of the travel switches 25b, 26b is released, as indicated by the upper left vertical arrow, the bottom door 7 stops abruptly without a ramp, as indicated by the dotted arrow. In this mode, it is therefore gently approached, but - except when reaching the end position - abruptly stopped.

The cooking chamber 3 is not opened, the bottom door 7 so do not proceed from the zero position PO when an opening fuse is active, so if, for example, a certain temperature in

Cooking space, z. B. 425 ⁰ C or 600 ⁰ F, is exceeded or a child safety device is activated.

Fig. 7 shows an analogous to Fig. 6, not to scale true diagram for a method of Bodentur 7 from the closed state to a stored position Pl = 476 mm in the automatic traversing operation.

In this case, by briefly pressing one of the UP switches 25b and 26b, as indicated by the upper right vertical arrow, the bottom door 7 automatically starts to move to the position Pl. Again, the bottom door 7 is approached gently (right ramp) and automatically braked (left ramp). In this embodiment can be selected in automatic mode between two fixed target speeds, namely 75 mm / s (dashed line) and 50 mm / s (solid line), the slower speed is particularly favorable for older users. Default, z. B. at delivery, is the slower speed level. It can also be provided more than two speed levels or target speeds; Also, a free adjustment of the desired speed (s) by the user is conceivable. Conveniently also switchable between at least two speed levels of 50 mm / s and 65 mm / s, z. B. at a device initialization.

8 shows a diagram, which is not true to scale, for a method of the bottom door 7 from the maximum opening position PZ to the zero position PO, that is to say into the closed state, in manual operation.

The traversing movement of the bottom door 7 upward begins with two-handed operation of the to-switch 25a and 26a, as indicated by the upper left vertical arrow. The control circuit 13 controls the drive motor 9 so that the bottom door 7 is gently approached from PZ to their desired speed of vL = 50 mm / s, and then with this target speed constant (to the right) is moved.

The control circuit 13 detects an approach to the zero position PO and brakes the bottom door 7 in good time before. However, instead of using the linear ramp to shift directly down to the zero position PO, the speed-dependent control is switched to control with a defined voltage 4 mm before the zero position PO, that is to say the speed-dependent control. H. by supplying the motor 9 with a corresponding voltage. As a result, let a maximum force development when blocking the drive motor 9 set. This voltage differs depending on the history of the process (load, Reibverhaltnisse etc.). The detection of the 4 mm opening dimension is done via the distance measurement or additionally or alternatively via the limit switch 33. In the range of PO to PO + 4 mm, it is also possible to dispense with an anti-pinch protection.

If, as in FIG. 6, one or both of the travel switches 25b, 26b are released, as indicated by the upper right vertical arrow, the bottom door 7 abruptly stops without a ramp, as indicated by the dotted arrow. FIG. 9 shows a diagram, which is not true to scale, for a method of the floor door 7 from a stored position Pl = 476 mm in the closed state PO in automatic movement operation. In contrast to the manual traversing operation shown in FIG. 8, only one of the CLOSE switches 25a, 26a now needs to be actuated for a short time, as indicated by the upper vertical arrow. Then go the bottom door 7 analogous to Fig. 7, only in the other direction. When approaching the zero position PO, the deceleration ramp for the last 4 mm opening changes from a speed-controlled state into a load- or closing-force-controlled state analogously to the situation from FIG. 8.

FIG. 10 shows a diagram analogous to FIG. 8, in which jamming now occurs at a setpoint speed of vL = 50 mm / s, as indicated by the upper vertical arrow. When pinching, for example, a hand or a pot, etc. between the bottom door 7 and the housing 1, the speed of the bottom door 7 drops, since the object hinders another method. The monitoring of the lift speed happens here, for example, by evaluating the sensor signals of the motor shaft, wherein z. B. the time between the measurement signals or pulses is evaluated. Only in the second instance is the motor current monitored, which is a rather slower method. In particular, the force that can be generated by the motor 9 for the method is limited in order to avoid accidents due to excessive clamping (see also FIGS. 12 and 13). The deviation from the desired speed is detected by the control circuit 13, z. B. by a speed deviation or a temporal change in speed. Then the bottom door reverses so that the object can be removed; if necessary, a, z. B. acoustic, warning signal issued. The bottom door 7 then moves only when a corresponding actuation of a travel operating field 25, 26 is repeated.

Thus the Einklemmfall is not falsely triggered, z. B by a change in payload or a change in the Running characteristics of the mechanics, firstly the anti-trap protection only active switched when the bottom door 7 has reached its target speed (previously a traversing key 25a, 25b, 26a, 26b released, the bottom door 7 stops immediately), and it may be secondly evaluated several sensor signals be, for example, averaged.

Fig. 11 shows the Einklemmfall (upper vertical arrow) in the opening process of the bottom door 7 in automatic mode to a target position Pl, in which an object between the bottom of the bottom door 7 and the worktop 8 is clamped. In this case, the Einklemmerkennung can be done via two redundant limit switches, which recognize a - especially non-uniform - relief of the bottom door 7, whereupon the drive motor 9 reverses. The maximum permissible force time profile (see FIGS. 12 and 13) is not exceeded.

FIG. 12 shows a force F in N which can be applied maximally to the base door 7 in the trapping case during the process in a closing direction (ie, upwards) against the elapsed time t in s as a first force time profile FT1.

In case of trapping at t = 0 s, the possible closing force is limited to 100 N, corresponding to approx. 10 kg, for 5 s. This is z. B. useful if the motor 9 is up-regulated by the controller 13 to hold the target speed. This ensures in particular that body parts are not injured. If the floor door is tightened for a maximum of 100 N for 5 s, the maximum force that can be applied is reduced further to 25 N, eg. For 5 seconds. In the following, this level of force can be kept or z. B. continue to be lowered to 0 N. It should be emphasized that this force time profile FTl indicates only the maximum loadable force, and the actually applied force is usually lower, for. B. if the Einklemmfall detected by the controller 13, and the bottom door 7 is reversed accordingly after t = 0.5 s, after which the applied force of 100 N to z. B. ON decreases. The maximum force threshold of 100 N can also apply to other traversing situations.

FIG. 13 shows a force F in N which can be applied to the bottom door 7 in the event of trapping in the process in an opening direction (that is, downwards) against the elapsed time t in s as a second force time profile FT2. Here, the drive motor 9 in a first block of t = [0 s; 0.5 s] up to 400 N to the bottom door 7, then at t = [0.5 s; 5 s] 150 N and then 25 N.

Of course, the time intervals and force threshold values of the force time profiles FT1, FT2 can be adapted to the structure and other boundary conditions.

Fig. 14 shows an exemplary process flow for learning functions. During the process of the door 7, a parameter vr dependent on the method of the door 7 is determined as a reference parameter. Particularly preferred is a reference speed vr as a reference parameter.

The parameter is determined in particular after the assembly of a cooking appliance during the first start-up, in order to be able to take into account environmental influences at the installation site. However, a repeated is particularly advantageous

Determination of the parameter in order to be able to take into account also with the time changing environmental influences or also internal peculiarities of the cooking appliance. In particular, a learning of such a parameter in each method of the door, in particular with each lifting of the door, so as to be able to take into account, for example, a constantly varying load.

14 shows, by way of example, a speed profile of a travel speed vL, wherein a speed v in mm / s is shown over a current position P of the door 7 in mm. As far as numbers are available, however, these are purely exemplary.

Starting from an end position PZ, which corresponds to a fully open door 7, the door 7 is raised in the direction of the muffle 5 and thereby accelerated. After reaching a lower intermediate position pa, the door 7 is moved upwards at a constant travel speed vL.

Depending on the travel speed vL as an example parameter, a further function of the cooking appliance can be controlled. Thus, for example, a pinching state can be detected if the travel speed before reaching an upper intermediate position pb, from which the door 7 is moved against the muffle 5 at a reducing speed, falls below a nominal travel speed vR.

The falling below a permissible minimum speed vs is preferably defined as the criterion for outputting a pinching signal or detecting a pinching condition. In principle, however, a state of disturbance can also generally be detected when leaving a speed tolerance range vT, wherein the speed tolerance range vT is likewise preferably specified as a function of the instantaneous operating conditions.

In the exemplary process sequence shown, the situation of a pinch state is sketched, in which the travel speed vL decreases before reaching the upper intermediate position pb and falls below the permissible nominal or minimum speed vS, as illustrated by the trapped speed profile. In such a case, the door 7 is preferably accelerated (reversed) in the opposite direction and moved downwards by an opening distance s in order to be able to remove a trapped object, as sketched by means of the exemplary restoring velocity curve v2. Since, depending on a momentary load on the door 7 and / or depending on current external and internal operating conditions for the cooking appliance, the achievable constant speed for raising the door 7 may vary, the cooking appliance may not even reach a usual permissible minimum speed vS, is for Functions such as the monitoring of a pinching state preferably uses such a learned parameter, such as the reference speed vr as the basis as a reference parameter for a target speed vR to be used. Depending on such a reference parameter determined once only after assembly of the cooking appliance or at a later time than the parameter to be determined, in particular to be measured, then individually a permissible minimum speed vS and / or a speed tolerance range vT are determined.

The determination of the reference parameter, in particular of the setpoint speed v R, is preferably carried out after reaching the lower intermediate position pa, from which the door 7 is moved upwards at a constant speed. In this case, the determination of the reference speed vr can preferably be carried out on a first route section as a reference route sr, so that a parameter determined via such a reference route sr can already be used for the further process of the door 7 upwards.

In principle, however, it is also possible to determine the parameter over a reference distance sr *, which is already in the acceleration range of the door 7 between the end position PZ and the lower intermediate position pa. Such a determination can be carried out advantageously in particular if, apart from an initial starting acceleration and a transition phase to the constant speed, there is a constant acceleration phase. In principle, the determination of the reference parameter but also over a larger area, possibly even over the entire trajectory is possible. The consideration of the entire trajectory, including or excluding acceleration or deceleration regions, can be used in particular to detect malfunctions or changes in the travel conditions (friction, levers, etc.) during normal operation. In the case of a fault, for example, a service signal can be output, which draws attention to a required lubrication or maintenance of guide rails or a drive module.

When learning parameters such as the reference speed vr as a parameter, a procedure is preferred in which an operator must keep a key or preferably two keys 25a, 26a printed during the parameter determination via a certain predetermined, in particular initial, stroke of the door 7 , For example, when starting the door, a user must hold the button (s) for at least 2 seconds, which allows the device to reach the ramp or lower position pa and pass the reference determination section sr. A premature release of the key (s) causes the reference value vr can not be determined correctly, which, for example, leads to the fact that an anti-trap based on the travel speed vL is not activated, so again no automatic traversing operation is allowed. Then releasing the keys leads to a movement stop and abort of the parameter determination. Even in later traversing movements, the determination of a parameter in the case of a disturbance, such as, for example, a trapping state, is preferably interrupted so as not to store any parameter determined from an incorrect traversing movement.

In addition to determining the reference parameter vr, this can, as already described above, also be readjusted by having one or more further ranges on small systematic changes, eg. B. due to variable friction or lever Conditions, monitored and adjusted. This readjustment is preferably carried out in the range of a constant setpoint, z. B. in the range of constant travel speed.

A parameter can be permanently stored in the cooking appliance in case of initial learning. However, such a parameter is usefully updated from time to time or even at each traversing movement to accommodate changing operating conditions.

LIST OF REFERENCE NUMBERS

1 housing

2 wall 3 cooking space

4 viewing window

5 muffles

6 muffle opening

7 bottom door 8 worktop

9 drive motor

10 lifting element

11 control element

12 control panel 13 control circuit

14 ad elements

15 hob

16 hotplate radiators

17 hob heating elements 18 surface heating elements

19 glass ceramic plate

20 mounting part

21 food support

22 top heaters 23 fans

24 seal

25 traversing panel

25a travel switch upwards

25b Travel switch down 26 Travel panel

26a Travel switch upwards

26b Travel switch down

27 storage unit

28 Confirmation key 29 Main switch

30 motor shaft

31 Hall element 32 Ms takers

33 limit switch

FTl first time profile

FT2 second force time profile P position pa lower intermediate position pb upper intermediate position

PO zero position

PZ end position PS changeover position

Rl speed ramp

R2 Velocity ramp ds Clamping signal sr, sr * Reference paths v2 Reset speed curve vr Reference parameter (reference speed) vR Setpoint speed vS Minimum speed vT Speed tolerance range vL Traversing speed of the floor door

Claims

claims

1. cooking appliance, in particular high-installation cooking appliance, with at least

a muffle (5) delimiting a cooking chamber (3) and having a muffle opening (6),

- A door (7) for closing the muffle opening (6) and

a drive device (9, 10) controlled by a control device (13) for moving the door (7),

- Wherein during a process of the door (7) by the method of the door (7) dependent parameter (vL) is determined, characterized in that

- The determined parameter (vL) is used as a reference parameter (vr) for a device function.

2. cooking appliance according to claim 1, characterized in that the reference parameter (vr) is subsequently used as a criterion for driving a function in the same movement of the door (7).

3. The method according to claim 1 or 2, characterized in that the reference parameter (vr) is subsequently used as a criterion in subsequent movements of the door (7).

4. Cooking appliance according to one of the preceding claims, characterized in that as the reference parameter (vr) is determined from a traversing speed (vL) reference speed (vR) is determined.

5. Cooking appliance according to claim 4, characterized in that the determination of the reference parameter (vr) after reaching a substantially constant travel speed (vL) is performed.

6. Cooking appliance according to claim 4 or 5, characterized in that the determination of the reference parameter (vr) is performed after reaching a constant acceleration.

7. Cooking appliance according to one of the preceding claims, characterized in that the determination of the reference parameter (vr) over the entire travel path is determined.

8. Cooking appliance according to one of the preceding claims, characterized in that a pinching condition is determined as a function of the specific reference parameter (vr).

9. A method for operating a cooking appliance, in particular a high-installation cooking appliance, with at least

a muffle (5) delimiting a cooking chamber (3) and having a muffle opening (6),

- A door (7) for closing the muffle opening (6) and

- The determined parameter (vL) as a reference parameter (vr) for a device function, in particular a anti-trap function is used.

10. The method according to claim 9, characterized in that for the determination of the reference parameter (vr) a key, in particular two keys (25a, 26a), are to be kept depressed.

11. The method according to claim 10, characterized in that when prematurely releasing the keys (25a, 26a), the determination of the reference parameter (vr) is aborted.

12. The method according to claim 10 or 11, characterized in that in case of premature release of the keys (25a, 26a) before determining the reference value (vr) no automatic operation on the basis of the reference parameter (vr) is allowed, in particular no movement operation of the door ( 7) is enabled.