EP1982121A2

EP1982121A2 - Cooking appliance

Info

Publication number: EP1982121A2
Application number: EP07712001A
Authority: EP
Inventors: Ingo Bally; Alexander Dinkel; Kerstin Feldmann; Wolfgang Fuchs; Martin Keller; Edmund Kuttalek; Maximilian Neuhauser; Klemens Roch; Wolfgang Schnell; Günter ZSCHAU
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2006-01-31
Filing date: 2007-01-03
Publication date: 2008-10-22
Also published as: WO2007088076A2; WO2007088076A3; US20090095278A1; DE102006004380A1

Abstract

The invention relates to a cooking appliance, especially a built-in wall cooking appliance, which comprises at least one muffle (5), delimiting a cooking compartment (3) and having a muffle opening (6), a door (7), guided by a lift mechanism (10; 22, 23), for closing the muffle opening (6), and at least one switch (24) that switches dependent on a position of the door (7). The invention is characterized in that the switch (24) is switched by the lift mechanism (10; 22, 23).

Description

Cooking appliance

The present invention relates to a cooking appliance, in particular a high-installation cooking appliance, with a coarse muffle with Muffelöffnung, a door for closing the Muffelöffnung, which is guided by a lifting mechanism, and at least one switch, which depends on a position of the Door switches. The present invention further relates to an associated method of operation.

From DE 102 28 140 Al and DE 102 28 141 Al generic high-installation cooking appliances are known in which a driving a bottom door on a muffle frame mounted on the lower muffle frame limit switch, whereupon the drive unit is turned off. A disadvantage here is that the switches have high switching point tolerances and thus a correct closing of the bottom door is not guaranteed. The tolerances are due in part to the isolation of the switches from heat, especially if the switch is mounted on or near the muffle opening. Also seals can create an increased circuit inaccuracy. In addition, circuit inaccuracy can occur due to tilted or inclined floor doors. This can lead to improper operation of the cooking appliance, for example, for heating the muffle in still slightly open bottom door.

It is the object of the present invention to provide a cooking appliance with a more reliable off-line circuit.

The present object is achieved by the cooking appliance having the features of patent claim 1 and by a method according to patent claim 12. Advantageous embodiments are in particular the dependent claims individually or in combination removed.

For this purpose, the cooking appliance, which is in particular a Hocheinbau- cooking appliance, but which may also be a cooking appliance with a baking tray, so arranged that the switch is switched by the lifting mechanism. As a result, the switch is independent of tilting of the door (eg due to its own weight) and can also be arranged at places which are not critical with respect to heat. This requires the

Switch no longer be insulated, and in its circuit is no longer influenced by a seal.

Then it is particularly advantageous if the switch is far away from the muffle opening, in particular arranged above the muffle. For a precise circuit with the smallest possible influence of bending or elastic effects of the lifting mechanism, in particular in a high-installation cooking appliance, the arrangement of the switch is above the

Lifting mechanism '. For precise circuit, it is also advantageous if the lifting mechanism is linearly movable, in particular on the basis of a telescopic rail, for. B. a double telescopic rail. Then, the switch can be switched, for example, by a movable part of the rail with respect to the switch, for. B. by the runner guide ('C-rail') or the runner or outgoing elements.

To use the switch as a limit switch, it is advantageous if the switch switches when the lifting mechanism has reached a position corresponding to the closing zero position of the door, z. B. when the runner guide or the Runners of the telescopic rail has been raised or collapsed to an associated position (eg height).

It may also be advantageous for determining a particular end-of-stroke or gap (dend) when the switch switches when the lifting mechanism has reached a position corresponding to a predetermined distance of the door from the closing zero position PO.

For increased reliability, or to detect a pinching the switch is redundant, z. B. as two switches.

The presence of the actuating signals of the at least one switch is preferably a necessary but not sufficient condition for determining a zero position or closed position of the door.

It is also advantageous if a zero position is detected when the at least one switch is actuated and at the same time a measurement of a travel of the door reaching the zero position PO at least within a certain tolerance range, for. B. ± 1%, indicates. Then the travel path can also be reset to a predetermined zero point value. For example, a 'swallowing' of sensor pulses within a tolerance range can be compensated.

It is metrologically favorable if the travel is determined by measuring a number of revolutions of the engine or a zughörigen gear or a fraction of this number. It is particularly advantageous if at least one sensor unit, in particular a Hall sensor Unit for measuring a number of revolutions of a motor shaft or a fraction thereof is present and connected to the control unit. Furthermore, it is advantageous if, starting from an initial zero position, the control unit counts the sensor pulses transmitted by the sensor unit when the door is moved and converts it into a travel path.

Additionally or alternatively, further conditions can be used to determine the zero point position. For example, it may be advantageous if a zero position PO is detected when the at least one switch is actuated and at the same time the door is not moved when the drive device is controlled. This condition may additionally or alternatively occur to the condition of the measured travel. The standstill of the bottom door or the drive device can be arbitrarily determined, for example by measuring the engine or transmission speed, the direct measurement of the traversing speed of the bottom door, the engine power or the motor current, etc.

The at least one switch can advantageously be two switches, which are each mounted in particular on each side of the cooking appliance, wherein a presence of the actuating signals of both switches is a necessary, but not sufficient condition for determining the zero position.

To avoid a deterioration of the circuit tolerance, the at least one switch is conveniently fastened to the carcass and is actuated by the lifting element, in particular by a telescopic rail. It is particularly favorable if, for the determination of a zero position PO of a door of a cooking appliance, the zero position of the door is then determined-typically by the control circuit-if simultaneously (a) the at least one switch has been actuated and (bl) has been measured a travel path of the door of the zero position PO at least within a tolerance range (eg ± 2 sensor pulses or ± 0.1 cm) and / or (b2) when the drive device is driven, the door can not be moved further.

Upon the occurrence of condition (a) and at least one of conditions (b1) and (b2) - or another condition for determining the zero point position PO, this position is set or initialized as the new zero position PO.

However, the travel path need not have a tolerance range, but can also be met as an exact condition, for. For example, the Hall pulse counter must correspond exactly to the value for the zero position.

It is particularly advantageous if, at least when the condition (a) occurs and at least one of the other conditions (bl, bl) used to determine the zero position PO does not occur or when the condition (a) does not occur, but all other conditions (bl, bl) used to determine the zero position (PO) occur, an error is detected or an associated error routine is traversed, the z. B. may include reversing the door. The actuation signals of the switches can be arbitrary, z. B. include a high or a low level.

In one embodiment of the cooking appliance two Steigungska- are provided, each of which is fixed on one side to one side of the door. The pitch cables are guided by an encapsulation to a drive wheel of a drive motor, whereby they are hinged on opposite sides on a motor shaft. By turning the drive wheel, the pitch cables are linearly displaced in the opposite direction. The door is linearly displaced accordingly. The use of the pitch cable drive in the cooking appliance firstly results in the advantage of a space-saving construction since the otherwise existing cable drum is no longer needed on the drive motor. Second, an assembly and adjustment compared to the drive with cable drum is much easier, since the costly winding on the cable drum accounts, for example, a cable tensioner is required. The fact that the pitch cables are connected to the door, in the general case, means that they are attached to the door directly or to an element connected to the door, e.g. B a telescopic rod, can be attached.

It is advantageous for increased reliability if each switching device is connected to a control circuit which is set up in such a way that it recognizes a trapping situation by evaluating the signals of the switching devices.

Particularly advantageously, the invention can be used in a Hocheinbau- cooking appliance with a bottom-side muffle opening and a bottom door. The invention will be described in more detail below with reference to the embodiments shown in the attached schematic figures. The embodiments do not limit the scope of the invention. Show it:

1 is a perspective view of a mounted on a wall high installation cooking appliance with lowered bottom door.

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

Fig. 3 in front view another embodiment of a high-installation cooking appliance.

The figures are not necessarily drawn to scale for better representation of the individual elements.

1 shows a high-installation cooking appliance with a housing 1 is shown. The back of the housing 1 is mounted on a wall 2 in the manner of a hanging wardrobe. In the housing 1, a cooking chamber 3 is defined, which can be controlled via a front side in the housing 1 introduced viewing window 4. In FIG. 3 it can be seen that the cooking space 3 is bounded 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 3, 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 3, in operative connection with a pair of lifting elements 10, which are connected to the base door 7. In this case, according to the schematic side view from FIG. 3, each lifting element 10 is designed as a telescopic linkage, which is attached, for example, on the one hand to the bottom door 7 (for example on a supporting angle protruding from the upper side of the bottom door 7) and on the other hand to a body 33 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 at the front of the bottom door 7 as shown in FIGS , 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 separated and communicating via a communication bus PCBs, represents a central control unit for the device operation and controls and / or regulates eg a heating, a floor door procedure 7, 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 in phantom in Fig. 1. In Fig. 1, the radiator 16, 17 two spaced apart, different sized cooking hob heaters, while the radiator 18 a between the two cooking area heaters 16,17 provided surface heating element, which almost encloses the cooking surface heaters 16, 17.

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 is further equipped with mounting holes (not shown), protrude through the base for holding support members 20 for Gargutträger 21, as shown in Fig. 3.

In Fig. 3 is schematically and not to scale a high-mounted cooking appliance shown from the front, in which the bottom door 7 is open to 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 bottom door 7 moving downwards in the opening direction. Without automatic operation (see below), the bottom door 7 moves upwards only if the ZU buttons 25a of both travel panels 25 are pressed simultaneously at the same time, 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 only optional. The control circuit 13 comprises in this exemplary embodiment, a memory unit 27 for storing at least one Zielbzw. Traversing position PO, Pl, P2, PZ the bottom door 7, preferably with volatile memory modules, eg. B. DRAMs. If a target position PO, Pl, P2, PZ has been stored, the bottom door can, after one of the keys 25a, 25b of the movement panels 25, be moved independently in the set direction until the next target position is reached or one of the keys 25a, 25b 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. If the last target position for one direction has been reached, manual operation must also be continued if this is possible (ie the last end positions do not correspond to a maximum open or closed final 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. B. in a new installation or after a power disconnection, no automatic mode is possible. If the soil 7 is moved in automatic mode, an anti-pinch protection is preferably activated.

A target position PO, Pl, P2, PZ may be any position of the floor door 7 between and including the zero position PO ("closed position") and the maximum opening position PZ. However, the maximum stored opening position PZ need not be the position with contact on the worktop 8. 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. For example, the sensor unit may include one or more induction, reverberation, opto, SAW sensors, and so forth. 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 moves past the measuring sensor 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. the 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 adding or subtracting the measurement signals with knowledge of the travel between two sensor signals, an absolute travel or ., an absolute position of the bottom door 7 are 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 readjusted by initialization in the zero position PO of the bottom door 7 at each startup, so z. B. a faulty sensor signal output or -aufnähme not traditional. Zero-point determination can be determined in several ways. The use of switches 24 alone is not optimal due to their comparatively high switching point tolerances.

In this embodiment, two switches 24 are attached to a dash-dot indicated support 34 of the body '33 such that they are actuated when closing the bottom door 7 by the elevating lifting mechanism 10, when the bottom door 7 dend between a predetermined gap between bottom door 7 and muffle opening. The switches 24 are located above the muffle 5, for cooling reasons on the body 33 with a distance from the walls of the muffle 5. The mechanical see actuation of the switch 24 (see curved arrows) by the lifting mechanism 10 - dotted here purely schematically in one almost drawn position before pressing is shown, the straight arrows indicate the associated direction of movement - in contrast, for example, for direct operation through the bottom door 7 has the advantage that a circuit is not affected by a tilting or inaccuracy of the position of the bottom door 7 , In addition, can be dispensed with an elaborate thermal insulation of the switch, the otherwise z. B. when switching through the bottom door or the surface of the bottom door forming hob would be necessary.

The switches 24 can also deactivate anti-trap protection when actuated.

The predetermined gap dimension dend here is between 12 mm and 4 mm, preferably between 6 mm and 10 mm. The switches are here twice for security; it can, for. B. for reasons of cost savings, but, for example, be present only a switch.

The determination of the zero point is more reliable by the use of measuring the travel path. If it is typically determined that the travel path is zero, that is, the zero position PO should be reached, the bottom door 7 is stopped. The travel can be determined, for example, by copying the sensor pulses. However, it may come to a false payment of the pulse, which is handed down without further action.

Another method is to determine whether the floor door still rotates despite activation of the motor 9 or not. However, pinching the floor door, where it stops, can pre-mirror a wrong zero position in the near range.

Therefore, in this embodiment, the zero point determination of the bottom door 7 is performed by a combination of these methods. In order for the control circuit 13 to determine the zero point position PO as such and to control the movement of the bottom door 7 in a next opening operation, firstly both switches 24 must be actuated and secondly the travel path - if necessary within a certain tolerance range - must be measured as belonging to the zero position and / or it may not move the engine 9 when pulling the bottom door, z. B. continue to turn left. In this embodiment, even all three conditions must be fulfilled. If this is the case, the control circuit 13 initializes the zero position and sets z. For example, the sensor pulse count returns to zero or another value predetermined for the zero position PO. If only one or two conditions occur, an error message can be output and, if necessary, the bottom door 7 can be reversed. Thus, an error message can be output if the sensor pulse count indicates a zero position PO, but the switches 24 have not yet been actuated, or the motor exceeds the tolerance range (eg 1 to 4 sensor pulses, corresponding to, for example, one half to two revolutions of the Motor shaft or gear shaft).

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

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 lower telescopic rod part 23 upper telescopic rod part

24 zero point switch

25 traversing panel

25a travel switch upwards

25b Travel switch down 27 Storage unit

28 confirmation button

29 main switch

30 motor shaft 31 Hall element

32 sensors

33 carcass

34 Edition end-of-range clearance PO Zero position Pl Intermediate position P2 Intermediate position PZ End position

Claims

claims

1. Cooking appliance, in particular high-installation cooking appliance, with at least - a cooking chamber (3) delimiting muffle (5) with muffle opening (6),

- a door (7) for closing the muffle opening (6), which is guided by a lifting mechanism (10, 22, 23), and

- At least one switch (24) which switches depending on a position of the door (7), characterized in that the switch (24) by the lifting mechanism (10, 22, 23) is switched.

2. Cooking appliance according to claim 1, characterized in that the switch (24) above the muffle (5) is arranged.

3. Cooking appliance according to claim 1 or 2, characterized in that the switch (24) above the lifting mechanism '(10; 22,23) is arranged.

4. Cooking appliance according to one of claims 1 to 3, characterized in that the lifting mechanism (10, 22, 23) comprises a telescopic rail (22, 23).

5. cooking appliance according to one of claims 1 to 4, characterized in that the switch (24) switches when the lifting mechanism (10; 22,23) has reached a position corresponding to the closing zero position (PO) of the door (7) ,

6. Cooking appliance according to one of claims 1 to 4, characterized in that the switch (24) switches when the lifting mechanism (10; 22,23) has reached a position that a predetermined distance (dend) of the door (7) from the closing zero position (PO) corresponds.

7. Cooking appliance according to one of claims 1 to 6, character- ized in that two switches (24) are present.

8. Cooking appliance according to one of the preceding claims, characterized in that a switching of the switch (24) is a necessary, but not sufficient condition for determining a closing zero position (PO) of the door (7).

9. Cooking appliance according to claim 8, characterized in that a zero position (PO) is detected when the at least one switch (24) is actuated and simultaneously measuring a travel path of the door (7) reaching the zero position (PO) at least within one certain tolerance range.

10. Cooking appliance according to one of the preceding claims, characterized in that a zero position (PO) is detected when the at least one switch (24) is actuated and at the same time driven drive device (9,48), the door (7) is not moved ,

11. Cooking appliance according to one of the preceding claims, characterized in that it is a high-installation cooking appliance and the muffle opening is a bottom-side muffle opening (6) and the door is a bottom door (7).

12. Method for determining a zero position (PO) of a door (7) of a cooking appliance according to one of the preceding claims characterized in that the zero position (PO) of the door (7) is detected when at the same time (a) the at least one switch (24) has been actuated and (bl) has been measured, that a travel of the door (7 ) corresponds to the zero position (PO) at least within a tolerance range and / or (b2) when the drive device (9,48) is controlled the door

(7) can not be moved.

13. The method according to claim 11 or 12, characterized in that at least when the condition (a) occurs and at least one of the other used to determine the zero position (PO) conditions (bl, bl) does not occur, or if the Condition (a) does not occur, but all other conditions (bl, bl) used to determine the zero position (PO) occur, an error is detected.