EP1213542B1 - A controller for the energy uptake fo an oven - Google Patents

A controller for the energy uptake fo an oven Download PDF

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Publication number
EP1213542B1
EP1213542B1 EP01204314A EP01204314A EP1213542B1 EP 1213542 B1 EP1213542 B1 EP 1213542B1 EP 01204314 A EP01204314 A EP 01204314A EP 01204314 A EP01204314 A EP 01204314A EP 1213542 B1 EP1213542 B1 EP 1213542B1
Authority
EP
European Patent Office
Prior art keywords
temperature
energy
oven
cavity
cooking
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.)
Expired - Lifetime
Application number
EP01204314A
Other languages
German (de)
French (fr)
Other versions
EP1213542A2 (en
EP1213542A3 (en
Inventor
Bettina Kohn
Franck Grevet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux AB
Original Assignee
Electrolux AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux AB filed Critical Electrolux AB
Priority to DK01204314T priority Critical patent/DK1213542T3/en
Publication of EP1213542A2 publication Critical patent/EP1213542A2/en
Publication of EP1213542A3 publication Critical patent/EP1213542A3/en
Application granted granted Critical
Publication of EP1213542B1 publication Critical patent/EP1213542B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00Stoves or ranges heated by electric energy
    • F24C7/08Arrangement or mounting of control or safety devices
    • F24C7/087Arrangement or mounting of control or safety devices of electric circuits regulating heat

Definitions

  • the present invention relates to a controller for controlling the amount of energy supplied to an oven cavity for cooking food and comprising temperature measuring means, energy control means, and means for maintaining a set temperature in the cavity, and timer means.
  • thermostat i.e. a device which connects the energy supply when the temperature in the oven cavity is below a set value and switches it off when the set temperature has been reached.
  • a stable temperature has been reached there is a regular cycling between on and off in order to compensate for heat losses to the environment.
  • the power is switched off, for instance by turning the thermostat setting to 0. The food is removed, and the oven is left to cool off, sometimes assisted by a built-in blower.
  • the document CH-A-678 996 shows an oven with a controller for controlling the amount of energy supplied to the oven cavity for cooking food, comprising temperature measuring means, energy control means, timer means and means for maintaining a set temperature in the cavity.
  • the applied control method allows energy savings at the end of a cooking process by switching off the energy supply a predetermined time before the end of the cooking process that a predetermined value of temperature is reached at the end of the cooking procedure. There is hence a need for a more efficient way of saving energy when using an oven.
  • the energy stored in the oven cavity is used until the lower temperature has been reached. It may then be determined if the food has been cooked to satisfaction, in which case the oven is switched off (manually) and the food removed. If this is not the case the cycle in the energy supply is repeated, until the cooking is finished.
  • the set temperature may be made automatically lower for the later part of the cooking in order to finish the cooking.
  • the lower temperature is in the neighbourhood of 100 °C. This means that cooking can usefully take place until this temperature is reached.
  • 100 °C is chosen as the lower temperature is that much cooking, in particular towards the end of the preparation, consists in heating and evaporating water.
  • the time and temperature defined process is in practice electronically controlled.
  • the time from start of the cooking to the first change to the second cycle (the first "first cycle") is dependent on the temperature setting, in that a higher setting makes a shorter first cycle.
  • the advantage of the new combined temperature and time controlled switching of the heating elements in an oven cavity is firstly the saving in energy during each use of the cavity in all cooking functions without any intervention or program from the users side.
  • the user prepares the food and sets the oven as usual.
  • the cooking result is not changed, only the energy consumption is reduced significantly. Energy is saved due to better exploitation of energy introduced into the system.
  • the heat transfer during the "second cycle" occurs mainly by radiation. This type of transfer in general distributes the energy evenly.
  • a temperature sensor 1 which is fitted in a conventional manner inside the cavity of an oven.
  • the temperature sensor provides the input to means for maintaining a set temperature in the cavity, in other words a controller which functions like a thermostat.
  • the temperature sensor also provides the input for energy control means which serve to cut the power supply to the oven cavity for a period when stable temperature conditions have been determined by regular swiching-on and switching-off in the thermostat circuit.
  • the time constants for heating an oven cavity may be individually calibrated for each cavity, and more sophisticated controllers will take into account the load of food inside the cavity for cooking.
  • Fig. 2 is seen the action of the energy control means for an oven cavity according to the invention.
  • the temperature function is shown in dependence of time. It will be observed that the temperature increases steeply until a first region of maintenance by means of the thermostat circuit is reached. At this stage the power is switched off, either until a pre-determined lower temperature has been reached, or for a pre-determined time. From that time or from the lower temperature the energy control means switch the power on again, and the temperature increases steeply until the set temperature has been reached and has stabilised, upon which the cycle repeats.
  • Each cycle contains a Maintenance phase, a Residual phase, and a Heat-up (reheat) phase.
  • the thin temperature curve shows the temperature in a conventional oven controlled only by thermostat circuit means.
  • the energy saving is shown by the curves representing the power averages for each of the phases.
  • the curve at (a) shows the initial full power supplied for the first heating up of the cavity, after which it falls to a maintenance value (b).
  • a maintenance value b.
  • the Residual phase the power falls to that consumed by ancillary equipment, such as the electronics, lamps, etc.
  • the initial value of power consumption occurs briefly, upon which it again falls to the maintenance value.
  • a traditional power controller for an oven cavity would have the same initial full power and a continuous maintenance power, but this would mean an overall higher energy consumption as compared to the controller according to the invention. This is demonstrated graphically by the drop in power during the Residual phase, from which has been subtracted the full power surge required in the Heat-up phase.
  • the rectangles Energy Saving represent an energy saving in each cycle according to the invention.
  • variable time start of the Residual phase
  • the variable time varies depending on the oven set temperature. The higher the set temperature, the earlier the first Residual phase starts.
  • the correlation between the cavity centre temperature and cooking time is negative. This embodiment secures good cooking results and to optimise the energy consumption for each cooking process.
  • the advantage of the new controlled switching of the heating elements in an oven cavity is that it saves energy during each use of the cavity for all cooking functions without any special instruction of program from the user's side.
  • the customer prepares the food and sets the oven as usual.
  • the cooking result is not changed, only there is a significant reduction of the energy consumed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Temperature (AREA)
  • Cookers (AREA)
  • Drying Of Solid Materials (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Electric Ovens (AREA)

Abstract

In conventional ovens the heating elements are controlled by a thermostat which cycles the temperature between a minimum and maximum cavity temperature. The cycling is constant over the whole cooking time. According to the invention the energy supply is controlled by the obtaining of a stable cycling, subsequent to which the temperature drops a predetermined amount, followed by renewed feeding of energy until stable conditions again prevail, and the process repeats itself. This type of control permits considerable energy savings. <IMAGE>

Description

  • The present invention relates to a controller for controlling the amount of energy supplied to an oven cavity for cooking food and comprising temperature measuring means, energy control means, and means for maintaining a set temperature in the cavity, and timer means.
  • Conventional ovens are fitted with a thermostat, i.e. a device which connects the energy supply when the temperature in the oven cavity is below a set value and switches it off when the set temperature has been reached. When a stable temperature has been reached there is a regular cycling between on and off in order to compensate for heat losses to the environment. There is frequently a hystereris involved in that there is a difference in temperature between switching-on and switching off for a given temperature setting. During the cycling the temperature hence fluctuates slightly. When the cooking is finished, either programmed or upon evaluation of the result by the user, the power is switched off, for instance by turning the thermostat setting to 0. The food is removed, and the oven is left to cool off, sometimes assisted by a built-in blower. The energy stored in the cavity, in particular in its metal parts, is lost to the room and has not contributed to the cooking, although it would be measured as being consumed in the cooking process. There is hence a need for energy saving. It is known to save energy by switching-offthe oven before the cooking has finished in order to use the "residual heat", however this requires a large experience in the user and for that reason it is only undertaken with well-known recipes.
  • The document CH-A-678 996 shows an oven with a controller for controlling the amount of energy supplied to the oven cavity for cooking food, comprising temperature measuring means, energy control means, timer means and means for maintaining a set temperature in the cavity. The applied control method allows energy savings at the end of a cooking process by switching off the energy supply a predetermined time before the end of the cooking process that a predetermined value of temperature is reached at the end of the cooking procedure. There is hence a need for a more efficient way of saving energy when using an oven.
  • According to the invention this is obtained by the features of claim 1. In this way, the energy stored in the oven cavity is used until the lower temperature has been reached. It may then be determined if the food has been cooked to satisfaction, in which case the oven is switched off (manually) and the food removed. If this is not the case the cycle in the energy supply is repeated, until the cooking is finished. The set temperature may be made automatically lower for the later part of the cooking in order to finish the cooking.
  • In an advantageous embodiment the lower temperature is in the neighbourhood of 100 °C. This means that cooking can usefully take place until this temperature is reached. The reason that 100 °C is chosen as the lower temperature is that much cooking, in particular towards the end of the preparation, consists in heating and evaporating water.
  • The time and temperature defined process is in practice electronically controlled. The time from start of the cooking to the first change to the second cycle (the first "first cycle") is dependent on the temperature setting, in that a higher setting makes a shorter first cycle.
  • The advantage of the new combined temperature and time controlled switching of the heating elements in an oven cavity is firstly the saving in energy during each use of the cavity in all cooking functions without any intervention or program from the users side. The user prepares the food and sets the oven as usual. The cooking result is not changed, only the energy consumption is reduced significantly. Energy is saved due to better exploitation of energy introduced into the system. The heat transfer during the "second cycle" occurs mainly by radiation. This type of transfer in general distributes the energy evenly.
  • The invention will be described in greater detail with reference to the drawing, in which
  • Fig. 1 shows a block diagram for an energy supply control according to the invention, and
  • Fig. 2 shows temperature and power on/off functions over time in an oven control according to the invention.
  • In Fig. 1 is seen a temperature sensor 1 which is fitted in a conventional manner inside the cavity of an oven. The temperature sensor provides the input to means for maintaining a set temperature in the cavity, in other words a controller which functions like a thermostat. The temperature sensor also provides the input for energy control means which serve to cut the power supply to the oven cavity for a period when stable temperature conditions have been determined by regular swiching-on and switching-off in the thermostat circuit. The time constants for heating an oven cavity may be individually calibrated for each cavity, and more sophisticated controllers will take into account the load of food inside the cavity for cooking.
  • In Fig. 2 is seen the action of the energy control means for an oven cavity according to the invention. The temperature function is shown in dependence of time. It will be observed that the temperature increases steeply until a first region of maintenance by means of the thermostat circuit is reached. At this stage the power is switched off, either until a pre-determined lower temperature has been reached, or for a pre-determined time. From that time or from the lower temperature the energy control means switch the power on again, and the temperature increases steeply until the set temperature has been reached and has stabilised, upon which the cycle repeats. Each cycle contains a Maintenance phase, a Residual phase, and a Heat-up (reheat) phase. The thin temperature curve shows the temperature in a conventional oven controlled only by thermostat circuit means.
  • The energy saving is shown by the curves representing the power averages for each of the phases. The curve at (a) shows the initial full power supplied for the first heating up of the cavity, after which it falls to a maintenance value (b). When the Residual phase is entered, the power falls to that consumed by ancillary equipment, such as the electronics, lamps, etc. During the Heat-up phase the initial value of power consumption occurs briefly, upon which it again falls to the maintenance value. A traditional power controller for an oven cavity would have the same initial full power and a continuous maintenance power, but this would mean an overall higher energy consumption as compared to the controller according to the invention. This is demonstrated graphically by the drop in power during the Residual phase, from which has been subtracted the full power surge required in the Heat-up phase.
  • The rectangles Energy Saving represent an energy saving in each cycle according to the invention.
  • This process which is defined by time and temperature is controlled electronically. In one embodiment the variable time (start of the Residual phase) varies depending on the oven set temperature. The higher the set temperature, the earlier the first Residual phase starts. The correlation between the cavity centre temperature and cooking time is negative. This embodiment secures good cooking results and to optimise the energy consumption for each cooking process.
  • The advantage of the new controlled switching of the heating elements in an oven cavity is that it saves energy during each use of the cavity for all cooking functions without any special instruction of program from the user's side. The customer prepares the food and sets the oven as usual. The cooking result is not changed, only there is a significant reduction of the energy consumed.

Claims (3)

  1. A controller for controlling the amount of energy supplied to an oven cavity for cooking food and comprising temperature measuring means, energy control means, and means for maintaining a set temperature in the cavity, and timer means, wherein the energy control means create a cyclic energy supply, in that when stable temperature conditions have been obtained in the cavity, the energy control means switch off the energy supply until a pre-determined lower temperature has been reached, subsequent to which the energy control means switch on the energy supply for obtaining and maintaining the set temperature until stable temperature conditions have again been obtained.
  2. A controller according to claim 1, characterised in that the timer means delay the start of the cyclic energy supply when the set temperature has been reached.
  3. A controller according to claim 1, characterised in that the pre-determined lower temperature is in the neighbourhood of 100 °C.
EP01204314A 2000-11-10 2001-11-12 A controller for the energy uptake fo an oven Expired - Lifetime EP1213542B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK01204314T DK1213542T3 (en) 2000-11-10 2001-11-12 Control device for energy absorption for a furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK200001685 2000-11-10
DKPA200001685 2000-11-10

Publications (3)

Publication Number Publication Date
EP1213542A2 EP1213542A2 (en) 2002-06-12
EP1213542A3 EP1213542A3 (en) 2003-06-18
EP1213542B1 true EP1213542B1 (en) 2005-12-28

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EP01204314A Expired - Lifetime EP1213542B1 (en) 2000-11-10 2001-11-12 A controller for the energy uptake fo an oven

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EP (1) EP1213542B1 (en)
AT (1) ATE314615T1 (en)
DE (1) DE60116244D1 (en)
DK (1) DK1213542T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112214054A (en) * 2019-07-10 2021-01-12 佛山市顺德区美的电热电器制造有限公司 Cooking appliance and heating control method and device thereof

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10132304B4 (en) * 2001-07-06 2005-10-27 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a cooking appliance
DE10240175A1 (en) * 2002-08-30 2004-04-22 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a cooking appliance
DE10313595A1 (en) 2003-03-26 2004-10-07 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a cooking process and cooking device
DE10337326B4 (en) * 2003-07-16 2008-05-15 Teka Küchentechnik GmbH Method and control device for controlling a cooking appliance having at least one cooking zone
DE102005047582B4 (en) * 2004-10-12 2007-10-11 Miele & Cie. Kg Method for cooking food in a cooking chamber of a cooking appliance
US8455798B2 (en) 2007-11-12 2013-06-04 Arcelik Anonim Sirketi Oven
DE102009003037A1 (en) * 2009-05-12 2010-11-18 BSH Bosch und Siemens Hausgeräte GmbH Method for carrying out a preparation process for a food
ES2579081T3 (en) * 2009-12-30 2016-08-04 Arçelik Anonim Sirketi Oven
WO2011080110A1 (en) 2009-12-31 2011-07-07 Arcelik Anonim Sirketi An oven
EP2538142A1 (en) * 2011-06-22 2012-12-26 Electrolux Home Products Corporation N.V. A method for controlling a heating-up period of cooking oven
EP3400802A1 (en) 2017-05-08 2018-11-14 Electrolux Appliances Aktiebolag Method for controlling a cooking process in a cooking oven
WO2023128907A1 (en) * 2021-12-30 2023-07-06 Mamur Teknoloji Sistemleri San. A.S. An oven temperature control method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1565336B2 (en) * 1965-09-17 1970-12-23 Bauknecht GEA Elektrotechnische Fabriken GmbH, 7012 Fellbach Method and device for heating the storage core of a heat storage furnace
CH678996A5 (en) * 1989-05-31 1991-11-29 Electrolux Ag Procedure and device for heating food in oven - where oven is automatically switched off shortly before completion of cooking and heat is recovered while allowing temp. to fall

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112214054A (en) * 2019-07-10 2021-01-12 佛山市顺德区美的电热电器制造有限公司 Cooking appliance and heating control method and device thereof
CN112214054B (en) * 2019-07-10 2022-02-25 佛山市顺德区美的电热电器制造有限公司 Cooking appliance and heating control method and device thereof

Also Published As

Publication number Publication date
DK1213542T3 (en) 2006-05-22
ATE314615T1 (en) 2006-01-15
DE60116244D1 (en) 2006-02-02
EP1213542A2 (en) 2002-06-12
EP1213542A3 (en) 2003-06-18

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