EP1394472A2 - Method for operating of a cooking appliance - Google Patents

Method for operating of a cooking appliance Download PDF

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Publication number
EP1394472A2
EP1394472A2 EP03018859A EP03018859A EP1394472A2 EP 1394472 A2 EP1394472 A2 EP 1394472A2 EP 03018859 A EP03018859 A EP 03018859A EP 03018859 A EP03018859 A EP 03018859A EP 1394472 A2 EP1394472 A2 EP 1394472A2
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EP
European Patent Office
Prior art keywords
control interval
cooking chamber
temperature
cooking
soll1
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.)
Granted
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EP03018859A
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German (de)
French (fr)
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EP1394472A3 (en
EP1394472B1 (en
Inventor
Josef Gerl
Hans Lappat
Konrad Zenz
Christian Zimmermann
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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    • 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

Definitions

  • the present invention relates to a method for operating a cooking appliance with a Cooking chamber, with the means of a heating device, a quantity of heat is supplied.
  • a quantity of heat is supplied.
  • Method is in a control interval a cooking chamber temperature to a target value regulated.
  • the Cooking chamber temperature not regulated, but regardless of the setpoint the cooking space none or supplied a certain amount of heat.
  • the cooking chamber temperature is regulated in a readjustment to the setpoint.
  • EP 1213542 is a generic method for operating a cooking appliance known. It follows that a control device on a cooking space temperature a set temperature controls. As soon as a stable temperature condition is reached, the Regulating the power supply for a predetermined period of time, or until a predetermined lower temperature limit is reached, off. Subsequently, the Cooking chamber temperature regulated back to the set temperature.
  • the control interval be interrupted prematurely.
  • the premature interruption occurs when at least an influencing variable changes the time behavior of the oven temperature in the regular interval and / or influenced in the control interval.
  • Such a change of influence causes in normal operation only a temporary deviation of the oven temperature from the setpoint.
  • Influencing variable change affects the success of the cooking process. This is through the Monitoring according to the invention possible influencing variable changes in Control interval prevented.
  • the influencing variable can be an operating mode which can be set during operation of the cooking appliance represent.
  • the control In a mode change from a top heat / bottom heat mode in a recirculation mode within the control interval, the control is equal to a temporary Deviation of the oven temperature from the setpoint. If the mode change occurs in the control interval, such compensation is not possible. In this case will according to the invention for safety reasons, the control interval prematurely interrupted to not to impair the cooking success.
  • the influencing variable can be formed by a disturbance variable when it is changed the oven temperature changes undesirable. This is the case, for example the heat dissipation from the cooking chamber increases by opening the cooking chamber door. If according to the invention such heat dissipation during the control interval is detected, the control interval is interrupted prematurely. Opening the oven door can be device-technically easily detected by a switch.
  • the switch will for example, pressed when closing through the door and released when opening again.
  • the switch also serves as a safety switch, for example, for a pyrolysis detects the closed position of the oven door.
  • control interval In contrast to the premature interruption of the control interval, at unchanged control variable, the control interval only after the occurrence of a predetermined Event ended. Such an event occurred about when - under With the help of an existing temperature sensor - a cooking chamber temperature falls below a predetermined temperature limit. Below the given Temperature limit is assumed to be an effective heating of the food is no longer possible.
  • control interval is ended after a predetermined period of time.
  • FIG. 1 shows a baking oven 1 with a baking oven muffle 3. This one is from one Heat insulating layer 5 surrounded.
  • the oven muffle 3 adjoins a cooking chamber 7, which is closed by means of a front-side oven door 8.
  • a Gargutlini 9 supported, on which a food to be cooked 11 is located.
  • a heating of the cooking chamber 7 takes place via a arranged in the cooking chamber 7 Oberhitzeterrorism stresses 13 and a UnterhitzelikSystem 15.
  • the temperature within the cooking chamber 7 is of a Temperature sensor 17 detected, which is also arranged in the cooking chamber 7. Of the Temperature sensor 17 passes via a signal line 18 a corresponding Temperature signal to a controller 19 of the oven 1 on.
  • 19 acts on the control means in a first predetermined AufMapintervall t 1, the upper and lower heat heating elements 13, 15 with the maximum power of P 1 ,
  • the oven temperature is thus initially increased as quickly as possible to the setpoint T soll1 .
  • the cooking chamber temperature is already in the vicinity of the setpoint T soll1 . Delayed in time and with a lower temperature rise, a temperature T o on the surface of the food 11 and a temperature T l present in the interior of the food 11 follow. This runs due to a thermal resistance on the outer layer of the food 11 below the temperature T o .
  • the regulating device 19 After the heating interval t 1 has elapsed, the regulating device 19, for example a PI controller, starts the regulation of the cooking chamber temperature to the desired value T soll1 .
  • the control device 19 determines a suitable manipulated variable on the basis of the temperature signal detected by the temperature sensor 17.
  • the size of the power supply P 1 to the radiators 13, 15 depends on the manipulated variable.
  • the cooking chamber temperature approaches in normal operation the setpoint T soll1 and enters the permanent whereabouts in a tolerance band of the setpoint T soll1 .
  • the tolerance band extends between the temperatures T max and T min , which are usually on the order of about 5 - 10 K apart.
  • the necessary time span for the entire cooking process extends beyond the end of the control interval t 3 . Therefore, another control interval t 4 takes place after the control interval t 3 .
  • the cooking chamber temperature is again regulated to the desired value T soll1 , whereupon a second control interval t 5 follows.
  • the cooking chamber door 8 is opened during the second control interval t 5 . Due to the increased heat dissipation from the open cooking chamber 7, the hot room temperature U is undesirably a b.
  • the time curve of the cooking chamber temperature inclines downward in a pitch angle .alpha. Which is greater than a pitch angle stored in the control device.
  • the control device 19 therefore interrupts the control interval t 5 prematurely, ie by a time difference ⁇ t before the actual end of the control interval t 5 . Subsequently, the controller 19 switches to a new readjustment. As shown in FIG. 2, therefore, the prematurely interrupted control interval t 5 thus passes directly into the control interval t 6 .
  • FIG. 3 shows the heating operation of the oven 1 according to the second exemplary embodiment.
  • the control intervals are ended when the influencing variables have not changed after a predetermined period of time has elapsed.
  • the first control interval ends after a predetermined period of time t 3 .
  • the second control interval t 4 and a second control interval t 5 .
  • the operator enters a new setpoint T soll2 .
  • the control device 19 interrupts the second control interval prematurely already after a time t 5 , which is smaller than the predetermined time t 3 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Electric Ovens (AREA)
  • Control Of Temperature (AREA)
  • Feedback Control In General (AREA)

Abstract

When thermoplastic oven is first switched on a continuous current flows during a first time period (t1) until the temperature sensor registers the desired operating temperature (TSoll1). This value is in the middle of a tolerance band (Tmax,Tmin). At this point the heating current is switched off and a short time period (t2) contains two short pulses of current. The measured temperature may oscillate on reaching this threshold. It then slowly declines until a minimum threshold value is reached at the end of a third time period (t3). A broad pulse is applied during a fourth time period (t4). If the oven door is opened, the rapid rate of fall of the measured temperature (alpha), triggers a broad current pulse.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Betrieb eines Gargeräts mit einem Garraum, dem m ittels einer Heizeinrichtung eine Wärmemenge zugeführt wird. In dem Verfahren wird in einem Regelintervall eine Garraumtemperatur auf einen Sollwert geregelt. In einem dem Regelintervall folgenden Steuerintervall wird die Garraumtemperatur nicht geregelt, sondern unabhängig vom Sollwert dem Garraum keine oder eine bestimmte Wärmemenge zugeführt. Nach dem Ende des Steuerintervalls wird die Garraumtemperatur in einer Nachregelung auf den Sollwert geregelt.The present invention relates to a method for operating a cooking appliance with a Cooking chamber, with the means of a heating device, a quantity of heat is supplied. By doing Method is in a control interval a cooking chamber temperature to a target value regulated. In a control interval following the rule interval, the Cooking chamber temperature not regulated, but regardless of the setpoint the cooking space none or supplied a certain amount of heat. After the end of the tax interval is the cooking chamber temperature is regulated in a readjustment to the setpoint.

Aus der EP 1213542 ist ein gattungsgemäßes Verfahren zum Betrieb eines Gargerätes bekannt. Daraus geht hervor, dass eine Regeleinrichtung eine Garraumtemperatur auf eine Solltemperatur regelt. Sobald ein stabiler Temperaturzustand erreicht ist, schaltet die Regeleinrichtung die Energiezufuhr für eine vorbestimmte Zeitdauer, bzw. bis eine vorbestimmte untere Temperaturgrenze erreicht ist, aus. Anschließend wird die Garraumtemperatur wieder auf die Solltemperatur geregelt.From EP 1213542 is a generic method for operating a cooking appliance known. It follows that a control device on a cooking space temperature a set temperature controls. As soon as a stable temperature condition is reached, the Regulating the power supply for a predetermined period of time, or until a predetermined lower temperature limit is reached, off. Subsequently, the Cooking chamber temperature regulated back to the set temperature.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zum Betrieb eines Gargeräts bereitzustellen, bei dem ein Garvorgang in einer effektiven und zuverlässigen Weise erfolgt.The object of the invention is a method for operating a cooking appliance to provide a cooking process in an effective and reliable manner he follows.

Die Aufgabe ist durch ein Verfahren mit den Merkmalen des Patentanspruches 1 gelöst. Gemäß dem kennzeichnenden Teil des Patentanspruches 1 kann das Steuerintervall vorzeitig unterbrochen werden. Die vorzeitige Unterbrechung erfolgt, wenn sich zumindest eine Einflussgröße ändert, die das Zeitverhalten der Garraumtemperatur im Regelintervall und/oder im Steuerintervall beeinflusst. Eine solche Änderung der Einflussgröße verursacht im Regelbetrieb lediglich eine zeitweilige Abweichung der Garraumtemperatur von dem Sollwert. Im ungeregelten Steuerintervall kann dagegen eine derartige Einflussgrößen-Änderung den Garerfolg beeinträchtigt. Dies ist durch die erfindungsgemäße Überwachung möglicher Einflussgrößen-Änderungen im Steuerintervall verhindert. The object is achieved by a method having the features of claim 1. According to the characterizing part of claim 1, the control interval be interrupted prematurely. The premature interruption occurs when at least an influencing variable changes the time behavior of the oven temperature in the regular interval and / or influenced in the control interval. Such a change of influence causes in normal operation only a temporary deviation of the oven temperature from the setpoint. In the uncontrolled control interval, however, such Influencing variable change affects the success of the cooking process. This is through the Monitoring according to the invention possible influencing variable changes in Control interval prevented.

Als die oben beschriebene Einflussgröße kann der Sollwert überwacht werden. Eine Änderung des Sollwerts im Regelbetrieb verursacht lediglich eine zeitweilige Abweichung der Garraumtemperatur von dem geänderten Sollwert. Erfolgt die Änderung des Sollwertes im Steuerintervall, so wird erfindungsgemäß als Vorsichtsmaßnahme das Steuerintervall vorzeitig unterbrochen. Um die Garraumtemperatur wunschgemäß schnell dem geänderten Sollwert anzugleichen, kann sich an das unterbrochene Steuerintervall erneut ein Regelbetrieb anschließen.As the influencing variable described above, the target value can be monitored. A Changing the setpoint in control mode only causes a temporary deviation the cooking chamber temperature of the changed setpoint. If the change of the Setpoint in the control interval, so according to the invention as a precautionary measure Control interval interrupted prematurely. To the oven temperature as desired quickly to match the changed setpoint, may be due to the interrupted control interval again connect a control mode.

Alternativ kann die Einflussgröße eine im Betrieb des Gargeräts einstellbare Betriebsart darstellen. Bei einer Betriebsart-Änderung von einem Oberhitze-/Unterhitzebetrieb in einen Umluftbetrieb innerhalb des Regelintervalls gleicht die Regelung eine zeitweilige Abweichung der Garraumtemperatur von dem Sollwert aus. Erfolgt die Betriebsart-Änderung im Steuerintervall, so ist derartige Ausgleich nicht möglich. In diesem Fall wird erfindungsgemäß aus Sicherheitsgründen das Steuerintervall vorzeitig unterbrochen, um den Garerfolg nicht zu beeinträchtigen.Alternatively, the influencing variable can be an operating mode which can be set during operation of the cooking appliance represent. In a mode change from a top heat / bottom heat mode in a recirculation mode within the control interval, the control is equal to a temporary Deviation of the oven temperature from the setpoint. If the mode change occurs in the control interval, such compensation is not possible. In this case will according to the invention for safety reasons, the control interval prematurely interrupted to not to impair the cooking success.

Ferner kann die Einflussgröße durch eine Störgröße gebildet sein, bei deren Änderung sich die Garraumtemperatur unerwünscht ändert. Dies ist beispielsweise der Fall, wenn sich durch ein Öffnen der Garraumtür die Wärmeableitung aus dem Garraum erhöht. Sofern erfindungsgemäß eine solche Wärmeableitung während des Steuerintervalls erfasst ist, wird das Steuerintervall vorzeitig unterbrochen. Das Öffnen der Garraumtür lässt sich gerätetechnisch einfach durch einen Schalter detektieren. Der Schalter wird etwa beim Schließen durch die Tür betätigt und beim Öffnen wieder freigegeben. Bevorzugt dient der Schalter zusätzlich als ein Sicherheitsschalter, der beispielsweise für einen Pyrolysebetrieb die Schließstellung der Garraumtür feststellt.Furthermore, the influencing variable can be formed by a disturbance variable when it is changed the oven temperature changes undesirable. This is the case, for example the heat dissipation from the cooking chamber increases by opening the cooking chamber door. If according to the invention such heat dissipation during the control interval is detected, the control interval is interrupted prematurely. Opening the oven door can be device-technically easily detected by a switch. The switch will for example, pressed when closing through the door and released when opening again. Preferably, the switch also serves as a safety switch, for example, for a pyrolysis detects the closed position of the oven door.

Vorteilhaft ist es, wenn eine Unterbrechung des Steuerintervalls erst bei bedeutsamen Änderungen im zeitliche Kurvenverlauf der Garraumtemperatur erfolgt. Das Steuerintervall kann daher vorteilhaft erst unterbrochen werden, sobald die Garraumtemperatur in einem Steigungswinkel fällt, der größer als ein vorbestimmter Steigungswinkel ist. It is advantageous if an interruption of the control interval only at significant Changes in the temporal curve of the oven temperature occurs. The Control interval can therefore advantageously be interrupted as soon as the Cooking chamber temperature falls at a pitch angle greater than a predetermined Pitch angle is.

Für einen effektiven Heizbetrieb kann es vorteilhaft sein, wenn nach der vorzeitigen Unterbrechung des Steuerintervalls unmittelbar die Nachregelung auf den Sollwert einsetzt.For an effective heating operation it may be advantageous if after the premature Interruption of the control interval directly the readjustment to the setpoint starts.

Im Unterschied zu der vorzeitigen Unterbrechung des Steuerintervalls, wird bei unveränderter Einflussgröße das Steuerintervall erst nach Eintritt eines vorgegebenen Ereignisses beendet. Eine solches Ereignis ist etwa eingetreten, wenn - unter Zuhilfenahme eines vorhandenen Temperatursensors - eine Garraumtemperatur unterhalb einer vorgegebenen Temperaturgrenze fällt. Unterhalb der vorgegebenen Temperaturgrenze wird davon ausgegangen, dass eine effektive Erwärmung des Garguts nicht mehr möglich ist.In contrast to the premature interruption of the control interval, at unchanged control variable, the control interval only after the occurrence of a predetermined Event ended. Such an event occurred about when - under With the help of an existing temperature sensor - a cooking chamber temperature falls below a predetermined temperature limit. Below the given Temperature limit is assumed to be an effective heating of the food is no longer possible.

Alternativ wird das Steuerintervall nach Ablauf einer vorgegebenen Zeitdauer beendet. Dadurch erfolgt die Beendigung des Steuerintervalls in gerätetechnisch einfacher Weise, ohne auf eine Temperatursensorik zurückgreifen zu müssen.Alternatively, the control interval is ended after a predetermined period of time. As a result, the termination of the control interval in device-technically simple manner, without resorting to a temperature sensor.

Nachfolgend sind zwei Ausführungsbeispiele der Erfindung anhand der beigefügten Figuren beschrieben. Es zeigen:

  • Figur 1 einen Backofen in einer schematischen Seitenansicht in Schnittdarstellung;
  • Figur 2 ein Temperatur- und Heizleistungsdiagramm gemäß dem ersten Ausführungsbeispiel; und
  • Figur 3 ein Temperatur- und Heizleistungsdiagramm gemäß dem zweiten Ausführungsbeispiel.
    • In the following, two embodiments of the invention will be described with reference to the attached figures. Show it:
  • Figure 1 shows a baking oven in a schematic side view in sectional view;
  • Figure 2 is a temperature and Heizleistungsdiagramm according to the first embodiment; and
  • 3 shows a temperature and Heizleistungsdiagramm according to the second embodiment.

    • In der Figur 1 ist ein Backofen 1 mit einer Backofenmuffel 3 gezeigt. Diese ist von einer Wärmeisolierungsschicht 5 umgeben. Die Backofenmuffel 3 grenzt einen Garraum 7 ein, der mittels einer frontseitigen Backofentür 8 verschlossen ist. In dem Garraum 7 ist ein Gargutträger 9 gehaltert, auf dem ein Gargut 11 liegt. Eine Aufheizung des Garraums 7 erfolgt über einen im Garraum 7 angeordneten Oberhitzeheizkörper 13 und einen Unterhitzeheizkörper 15. Die Temperatur innerhalb des Garraums 7 wird von einem Temperatursensor 17 erfasst, der ebenfalls im Garraum 7 angeordnet ist. Der Temperatursensor 17 leitet über eine Signalleitung 18 ein entsprechendes Temperatursignal an eine Regeleinrichtung 19 des Backofens 1 weiter.FIG. 1 shows a baking oven 1 with a baking oven muffle 3. This one is from one Heat insulating layer 5 surrounded. The oven muffle 3 adjoins a cooking chamber 7, which is closed by means of a front-side oven door 8. In the cooking chamber 7 is a Gargutträger 9 supported, on which a food to be cooked 11 is located. A heating of the cooking chamber 7 takes place via a arranged in the cooking chamber 7 Oberhitzeheizkörper 13 and a Unterhitzeheizkörper 15. The temperature within the cooking chamber 7 is of a Temperature sensor 17 detected, which is also arranged in the cooking chamber 7. Of the Temperature sensor 17 passes via a signal line 18 a corresponding Temperature signal to a controller 19 of the oven 1 on.

    Die Regeleinrichtung 19 ist über ein Bedienfeld 21 betätigbar, das an der in der Figur 1 rechten Frontseite des Backofens 1 vorgesehen ist. In das Bedienfeld 21 kann ein Benutzer Sollwerte für Garraumtemperaturen sowie gewünschte Betriebsarten eingeben, beispielsweise einen Oberhitze-/Unterhitzebetrieb oder einen Umluftbetrieb. Die Regeleinrichtung 19 ist wiederum mit den Oberhitze- und Unterhitzeheizkörpern 13, 15 sowie mit einem im Garraum 7 angeordneten Umluftgebläse 23 verbunden.The control device 19 can be actuated via a control panel 21, which at the in the figure 1 right front of the oven 1 is provided. In the control panel 21 can User enter setpoint values for oven temperatures and desired operating modes, for example, a top heat / bottom heat mode or a recirculation mode. The Control device 19 is in turn connected to the upper heat and lower heat radiators 13, 15th and connected to a arranged in the cooking chamber 7 Umluftgebläse 23.

    In der Figur 2 ist ein Temperatur- und Heizleistungsdiagramm gezeigt, dass beispielhaft einen Heizbetrieb des Backofens 1 gemäß dem ersten Ausführungsbeispiel wiedergibt. Aus dem Heizleistungsdiagramm ist ersichtlich, dass sich die Heizleistung P nicht stufenlos ändert, sondern zwischen 0 und einer maximalen Heizleistung P1 wechselt. Entsprechend der dem Garraum 7 zuzuführenden Wärmemenge wird dabei die Zeitdauer eingestellt, in der die Heizkörper 13, 15 mit der maximalen Heizleistung P1 betrieben werden bzw. in der die Heizleistungszufuhr zu den Heizkörpern 13, 15 unterbrochen ist. Nach einer Eingabe der gewünschten Solltemperatur Tsoll1 durch die Bedienperson startet der Heizbetrieb des Backofens 1 zum Zeitpunkt t = 0. Dabei beaufschlagt die Regeleinrichtung 19 in einem ersten festgelegten Aufheizintervall t1 die Ober- und Unterhitzeheizkörper 13, 15 mit der maximalen Leistung von P1. Die Garraumtemperatur wird somit anfänglich möglichst schnell auf den Sollwert Tsoll1 erhöht. Am Ende des Aufheizintervalls t1 befindet sich die Garraumtemperatur bereits in der Nähe des Sollwertes Tsoll1. Zeitlich verzögert sowie mit einem geringeren Temperaturanstieg folgen eine Temperatur To an der Oberfläche des Garguts 11 sowie eine im Inneren des Garguts 11 vorhandene Temperatur Tl. Diese verläuft aufgrund eines Wärmewiderstandes an der Außenschicht des Gargutes 11 unterhalb der Temperatur To.FIG. 2 shows a temperature and heating output diagram which exemplifies a heating operation of the oven 1 according to the first embodiment. From the Heizleistungsdiagramm can be seen that the heating power P does not change continuously, but between 0 and a maximum heat output P 1 changes. In accordance with the amount of heat to be supplied to the cooking chamber 7, the duration is set in which the radiators 13, 15 are operated with the maximum heating power P 1 or in which the heating power supply to the radiators 13, 15 is interrupted. After an input the desired set temperature T set1 by the operator, the heating operation start of the baking oven 1 at time t = 0. In this case, 19 acts on the control means in a first predetermined Aufheizintervall t 1, the upper and lower heat heating elements 13, 15 with the maximum power of P 1 , The oven temperature is thus initially increased as quickly as possible to the setpoint T soll1 . At the end of the heating interval t 1 , the cooking chamber temperature is already in the vicinity of the setpoint T soll1 . Delayed in time and with a lower temperature rise, a temperature T o on the surface of the food 11 and a temperature T l present in the interior of the food 11 follow. This runs due to a thermal resistance on the outer layer of the food 11 below the temperature T o .

    Nach Ablauf des Aufheizintervalls t1 startet die Regelungseinrichtung 19, beispielsweise ein Pl-Regler, die Regelung der Garraumtemperatur auf den Sollwert Tsoll1. Hierzu ermittelt die Regelungseinrichtung 19 anhand des vom Temperatursensor 1 7 erfassten Temperatursignals eine geeignete Stellgröße. Die Größe der Leistungszufuhr P1 zu den Heizkörpern 13, 15 richtet sich nach der Stellgröße. In dieser Weise nähert sich die Garraumtemperatur im Regelbetrieb dem Sollwert Tsoll1 und tritt zum dauerhaften Verbleib in ein Toleranzband des Sollwertes Tsoll1 ein. Das Toleranzband erstreckt sich zwischen den Temperaturen Tmax und Tmin, die üblicherweise in einer Größenordnung von ca. 5 - 10 K auseinander liegen.After the heating interval t 1 has elapsed, the regulating device 19, for example a PI controller, starts the regulation of the cooking chamber temperature to the desired value T soll1 . For this purpose, the control device 19 determines a suitable manipulated variable on the basis of the temperature signal detected by the temperature sensor 17. The size of the power supply P 1 to the radiators 13, 15 depends on the manipulated variable. In this way, the cooking chamber temperature approaches in normal operation the setpoint T soll1 and enters the permanent whereabouts in a tolerance band of the setpoint T soll1 . The tolerance band extends between the temperatures T max and T min , which are usually on the order of about 5 - 10 K apart.

    Sobald die Garraumtemperatur dauerhaft innerhalb des Toleranzbandes des Sollwertes Tsoll1 verbleibt, wird das Regelintervall t2 beendet. Bei der Beendigung des Regelintervalls wird davon ausgegangen, dass die Backofenmuffel 3 ausreichend stark erwärmt ist. In diesem Fall ist die in der Backofenmuffel 3 gespeicherte Wärmemenge für den Garvorgang effektiv nutzbar.As soon as the cooking chamber temperature remains permanently within the tolerance band of the setpoint T soll1 , the control interval t 2 is ended. At the end of the control interval it is assumed that the oven muffle 3 is sufficiently heated. In this case, the amount of heat stored in the oven muffle 3 can be used effectively for the cooking process.

    Nach dem Regelintervall t2 folgt ein Steuerintervall t3. Im Steuerintervall t3 wird die Garraumtemperatur nicht mehr von der Regelungseinrichtung 19 geregelt. Vielmehr erfolgt die Zufuhr einer vorgegebenen Wärmemenge unabhängig von der Größe des Sollwerts Tsoll1. Diese Wärmemenge ist vorteilhafterweise kleiner als die zur Regelung der Garraumtemperatur auf den Sollwert Tsoll1 notwendige Wärmemenge. Das Steuerintervall t3 wird beendet, sobald die Garraumtemperatur unter eine vorgegebene Temperaturgrenze Tgrenz fällt. Derartige Temperaturgrenzen sind beispielsweise in tabellarischer Form in einer Speichereinheit der Regelungseinrichtung 19 in Abhängigkeit von dem gewünschten Sollwert Tsoll1 der Garraumtemperatur gespeichert. Typischerweise liegen derartige Temperaturgrenzen in einer Größenordnung von etwa 25 - 35 K unterhalb der gewählten Solltemperatur Tsoll1.After the control interval t 2 , a control interval t 3 follows. In the control interval t 3 , the cooking chamber temperature is no longer regulated by the control device 19. Rather, the supply of a predetermined amount of heat is independent of the size of the setpoint T soll1 . This amount of heat is advantageously smaller than the amount of heat required to control the cooking chamber temperature to the desired value T soll1 . The control interval t 3 is terminated as soon as the cooking space temperature falls below a predetermined temperature limit T grenz . Such temperature limits are stored, for example, in tabular form in a memory unit of the control device 19 as a function of the desired setpoint T soll1 of the cooking chamber temperature. Typically, such temperature limits are on the order of about 25-35 K below the selected setpoint temperature T soll1 .

    Gemäß der Figur 2 erstreckt sich die notwendige Zeitspanne für den gesamten Garvorgang über das Ende des Steuerintervalls t3 hinaus. Daher erfolgt im Anschluss an das Steuerintervall t3 ein weiteres Regelintervall t4. Im Regelintervall t4 wird die Garraumtemperatur abermals auf den Sollwert Tsoll1 geregelt, woraufhin sich ein zweites Steuerintervall t5 anschließt. Wie in der Figur 2 gezeigt ist, wird während des zweiten Steuerintervalls t5 die Garraumtür 8 geöffnet. Aufgrund der erhöhten Wärmeableitung aus dem geöffneten Garraum 7 fällt d ie G arraumtemperatur u nerwünschterweise a b. Dabei neigt sich in der Figur 2 der zeitliche Kurvenverlauf der Garraumtemperatur in einem Steigungswinkel α nach unten, der größer als ein in der Regelungseinrichtung gespeicherter Steigungswinkel ist. Die Regeleinrichtung 19 unterbricht daher das Steuerintervall t5 vorzeitig, d. h. um eine zeitliche Differenz Δt vor dem eigentlichen Ende des Steuerintervalls t5. Anschließend schaltet die Regeleinrichtung 19 auf eine erneute Nachregelung. Wie in der Figur 2 gezeigt ist, geht daher das vorzeitig unterbrochene Steuerintervall t5 somit unmittelbar in das Regelintervall t6 über.According to FIG. 2, the necessary time span for the entire cooking process extends beyond the end of the control interval t 3 . Therefore, another control interval t 4 takes place after the control interval t 3 . In the control interval t 4 , the cooking chamber temperature is again regulated to the desired value T soll1 , whereupon a second control interval t 5 follows. As shown in FIG. 2, the cooking chamber door 8 is opened during the second control interval t 5 . Due to the increased heat dissipation from the open cooking chamber 7, the hot room temperature U is undesirably a b. In FIG. 2, the time curve of the cooking chamber temperature inclines downward in a pitch angle .alpha. Which is greater than a pitch angle stored in the control device. The control device 19 therefore interrupts the control interval t 5 prematurely, ie by a time difference Δt before the actual end of the control interval t 5 . Subsequently, the controller 19 switches to a new readjustment. As shown in FIG. 2, therefore, the prematurely interrupted control interval t 5 thus passes directly into the control interval t 6 .

    In der Figur 3 ist der Heizbetrieb des Backofens 1 gemäß dem zweiten Ausführungsbeispiel wiedergegeben. Im Heizbetrieb gemäß der Figur 2 werden die Steuerintervalle bei unveränderten Einflussgrößen nach Ablauf einer vorgegebenen Zeitdauer beendet. So endet nach dem ersten Regelintervall t2 das erste Steuerintervall nach Ablauf einer vorgegebenen Zeitdauer t3. Anschließend folgt ein zweites Regelintervall t4 und ein zweites Steuerintervall t5. Im zweiten Steuerintervall t5 gibt die Bedienperson einen neuen Sollwert Tsoll2 ein. Damit sich die Garraumtemperatur möglichst schnell dem neuen Sollwert Tsoll2 angleicht, unterbricht die Regelungseinrichtung 19 das zweite Steuerintervall vorzeitig bereits nach einer Zeitdauer t5, die kleiner als die vorgegebene Zeitdauer t3 ist. Nach der vorzeitigen Unterbrechung des Steuerintervalls t5 regelt die Regelungseinrichtung 19 in einem dritten Regelungsintervall t6 die Garraumtemperatur auf den neuen Sollwert Tsoll2. Die Steuerintervalle bzw. Regelintervalle wechseln sich dabei ab, bis die notwendige Zeitspanne für den gesamten Garvorgang abgelaufen ist.FIG. 3 shows the heating operation of the oven 1 according to the second exemplary embodiment. In the heating mode according to FIG. 2, the control intervals are ended when the influencing variables have not changed after a predetermined period of time has elapsed. Thus, after the first control interval t 2, the first control interval ends after a predetermined period of time t 3 . This is followed by a second control interval t 4 and a second control interval t 5 . In the second control interval t 5 , the operator enters a new setpoint T soll2 . In order for the cooking chamber temperature to adjust as quickly as possible to the new setpoint T soll2 , the control device 19 interrupts the second control interval prematurely already after a time t 5 , which is smaller than the predetermined time t 3 . After the premature interruption of the control interval t 5 , the control device 19 regulates the cooking chamber temperature to the new desired value T soll2 in a third control interval t 6 . The control intervals or control intervals alternate, until the necessary time has elapsed for the entire cooking process.

    Claims (8)

    Verfahren zum Betrieb eines Gargeräts (1) mit einem Garraum (7), dem mittels einer Heizeinrichtung (13, 15) eine Wärmemenge zugeführt wird, in welchem Verfahren in einem Regelintervall (t2, t4, t6) eine Garraumtemperatur auf einen Sollwert (Tsoll1, Tsoll2) geregelt wird, in einem dem Regelintervall (t2, t4, t6) folgenden Steuerintervall (t3, t5, t7) die Garraumtemperatur nicht geregelt wird, sondern unabhängig vom Sollwert (Tsoll1, Tsoll2) dem Garraum (7) keine oder eine bestimmte Wärmemenge zugeführt wird, und nach dem Ende des Steuerintervalls (t3, t5, t7) die Garraumtemperatur in einer Nachregelung auf den Sollwert (Tsoll1, Tsoll2) geregelt wird, dadurch gekennzeichnet, dass das Steuerintervall (t3, t5, t7) vorzeitig unterbrochen wird, wenn sich zumindest eine Einflussgröße ändert, die das Zeitverhalten der Garraumtemperatur im Regelintervall (t2, t4, t6) und/oder im Steuerintervall (t3, t5, t7) beeinflusst.Method for operating a cooking appliance (1) with a cooking chamber (7) to which a quantity of heat is supplied by means of a heating device (13, 15), in which process a cooking chamber temperature to a desired value in a control interval (t 2 , t 4 , t 6 ) (T soll1 , T soll2 ) is regulated, in a the control interval (t 2 , t 4 , t 6 ) following control interval (t 3 , t 5 , t 7 ) the cooking space temperature is not regulated, but independent of the setpoint (T soll1 , T soll2 ) the cooking chamber (7) no or a certain amount of heat is supplied, and after the end of the control interval (t 3 , t 5 , t 7 ) the cooking space temperature is controlled in a readjustment to the desired value (T soll1 , T soll2 ), characterized in that the control interval (t 3 , t 5 , t 7 ) is prematurely interrupted when at least one influencing variable changes, the time behavior of the cooking chamber temperature in the control interval (t 2 , t 4 , t 6 ) and / or in the control interval ( t 3 , t 5 , t 7 ). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Einflussgröße durch den Sollwert (Tsoll1, Tsoll2) gebildet wird, dessen Änderung das Zeitverhalten der Garraumtemperatur beeinflusst.A method according to claim 1, characterized in that the influencing variable is formed by the desired value (T soll1 , T soll2 ), the change of which influences the time behavior of the cooking chamber temperature. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einflussgröße durch eine im Betrieb des Gargeräts einstellbare Betriebsart gebildet wird, deren Änderung das Zeitverhalten der Garraumtemperatur beeinflusst.A method according to claim 1 or 2, characterized in that the influencing variable is formed by an adjustable mode of operation of the cooking appliance, the change of which influences the time behavior of the cooking chamber temperature. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einflussgröße durch eine Störgröße gebildet wird, bei deren Änderung sich die Garraumtemperatur unerwünscht ändert, etwa eine durch ein Öffnen des Garraums (7) erhöhte Wärmeableitung aus dem Garraum (7).Method according to one of the preceding claims, characterized in that the influencing variable is formed by a disturbance variable, the cooking chamber temperature changes undesirable, such as by opening the cooking chamber (7) increased heat dissipation from the cooking chamber (7). Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Steuerintervall (t3, t5, t7) erst unterbrochen wird, wenn der zeitliche Kurvenverlauf der Garraumtemperatur in einem Steigungswinkel (α) fällt, der größer als ein vorbestimmter Steigungswinkel ist. Method according to one of the preceding claims, characterized in that the control interval (t 3 , t 5 , t 7 ) is interrupted only when the temporal curve of the cooking chamber temperature falls in a pitch angle (α), which is greater than a predetermined pitch angle. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass unmittelbar nach der vorzeitigen Unterbrechung des Steuerintervalls (t3, t5, t7) die Nachregelung auf den Sollwert (Tsoll1, Tsoll2) einsetzt.Method according to one of the preceding claims, characterized in that immediately after the premature interruption of the control interval (t 3 , t 5 , t 7 ), the readjustment to the desired value (T soll1 , T soll2 ) is used. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei unveränderter Einflussgröße das Steuerintervall (t3, t5, t7) nach Ablauf einer vorgegebenen Zeitdauer beendet wird.Method according to one of the preceding claims, characterized in that, with unchanged influencing variable, the control interval (t 3 , t 5 , t 7 ) is terminated after a predetermined period of time. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass bei unveränderter Einflussgröße das Steuerintervall (t3, t5, t7) beendet wird, sobald die Garraumtemperatur unter eine vorgegebene Temperaturgrenze (Tgrenz) fällt.Method according to one of claims 1 to 6, characterized in that at unchanged influence the control interval (t 3 , t 5 , t 7 ) is terminated as soon as the cooking space temperature falls below a predetermined temperature limit (T grenz ).
    EP20030018859 2002-08-30 2003-08-19 Method for operating of a cooking appliance Expired - Lifetime EP1394472B1 (en)

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    DE10240175 2002-08-30

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    EP1998116A1 (en) * 2007-05-30 2008-12-03 Whirlpool Corporation A process for automatically controlling the heating/cooking of a food item in a cooking oven and cooking oven adapted to carry out such process
    EP2110605A1 (en) * 2008-04-15 2009-10-21 Whirpool Corporation Cooking method
    EP2063180A3 (en) * 2007-11-26 2012-04-11 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a cooking device and cooking device
    EP2337424A3 (en) * 2009-12-17 2012-06-06 E.G.O. Elektro-Gerätebau GmbH Electronic control for a cooking device and control method
    CN106136947A (en) * 2016-06-22 2016-11-23 北京小焙科技有限公司 The curve display methods of a kind of temperature and system
    EP2251607A3 (en) * 2009-05-12 2017-11-22 BSH Hausgeräte GmbH Method for carrying out a preparation process for a food product
    EP3786529A1 (en) * 2019-09-02 2021-03-03 Electrolux Appliances Aktiebolag Method for performing a cooking process in an oven cavity of a cooking oven

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    DE102006013806A1 (en) 2006-03-24 2007-09-27 Werner & Pfleiderer Lebensmitteltechnik Gmbh Method for operating an oven with a convection-heated baking chamber, a circulating air heater and a circulating air blower
    DE102010064232B4 (en) 2010-12-28 2024-04-11 BSH Hausgeräte GmbH Method and device for detecting the opening of a door of a cooking appliance
    DE102011017638A1 (en) * 2011-04-27 2012-10-31 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a cooking appliance and control and regulating device for a cooking appliance and cooking appliance
    DE102016212329A1 (en) * 2016-07-06 2018-01-11 E.G.O. Elektro-Gerätebau GmbH Method of controlling a baking oven and oven
    EP4019848B1 (en) 2020-12-22 2024-05-15 Electrolux Appliances Aktiebolag Method for operating a cooking oven

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    EP1998116A1 (en) * 2007-05-30 2008-12-03 Whirlpool Corporation A process for automatically controlling the heating/cooking of a food item in a cooking oven and cooking oven adapted to carry out such process
    US8283605B2 (en) 2007-05-30 2012-10-09 Whirlpool Corporation Process for automatically controlling the heating/cooking of a food item in a cooking oven and cooking oven adapted to carry out such process
    EP2063180A3 (en) * 2007-11-26 2012-04-11 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a cooking device and cooking device
    EP2110605A1 (en) * 2008-04-15 2009-10-21 Whirpool Corporation Cooking method
    US8552344B2 (en) 2008-04-15 2013-10-08 Whirlpool Corporation Cooking method
    EP2251607A3 (en) * 2009-05-12 2017-11-22 BSH Hausgeräte GmbH Method for carrying out a preparation process for a food product
    EP2337424A3 (en) * 2009-12-17 2012-06-06 E.G.O. Elektro-Gerätebau GmbH Electronic control for a cooking device and control method
    CN106136947A (en) * 2016-06-22 2016-11-23 北京小焙科技有限公司 The curve display methods of a kind of temperature and system
    EP3786529A1 (en) * 2019-09-02 2021-03-03 Electrolux Appliances Aktiebolag Method for performing a cooking process in an oven cavity of a cooking oven

    Also Published As

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    DE10240175A1 (en) 2004-04-22
    ES2387887T3 (en) 2012-10-03
    EP1394472B1 (en) 2012-07-04

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