EP0950862B1 - Système d'évalution de l'état de salissures de la cavité d'un four - Google Patents

Système d'évalution de l'état de salissures de la cavité d'un four Download PDF

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Publication number
EP0950862B1
EP0950862B1 EP19990400878 EP99400878A EP0950862B1 EP 0950862 B1 EP0950862 B1 EP 0950862B1 EP 19990400878 EP19990400878 EP 19990400878 EP 99400878 A EP99400878 A EP 99400878A EP 0950862 B1 EP0950862 B1 EP 0950862B1
Authority
EP
European Patent Office
Prior art keywords
cell
dirt
temperature
cavity
cracking
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
EP19990400878
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0950862A1 (fr
Inventor
Jean-Paul Chevrier
Serge Hilbey
Pascal Oudart
Jean Sauton
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.)
Europeenne De Fabrication D'enceintes Mi Cie
Brandt Cooking SAC
Brandt Industries SAS
Original Assignee
Compagnie Europeenne pour lEquipement Menager SA
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Publication date
Application filed by Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Publication of EP0950862A1 publication Critical patent/EP0950862A1/fr
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Publication of EP0950862B1 publication Critical patent/EP0950862B1/fr
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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
    • F24C14/00Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type

Definitions

  • the invention relates to the field of soiling detection in the oven cavities. Indeed, when the oven is dirty, that is to say when grease or other projections have been deposited on the walls of the cavity oven during previous cooking, bad smells can be released during a new cooking.
  • the oven In order to clean the cavity of oven, the oven usually includes a pyrolysis device.
  • Pyrolysis is triggered by the oven user, when the oven is dirty. But there is no device measuring the state of soiling of walls of an oven cavity; this state of soiling is appreciated subjectively by the user who notices for example the presence of spots on the walls of the cavity.
  • the temperature in the cavity rises to high values, typically above 500 ° C, for a while, for example about two to three hours. The user will perform this pyrolysis operation at the frequency he will choose. But this frequency is not optimized because of subjective assessment of the state of soiling in the cavity.
  • AU-A-597521 discloses an automatic system of pyrolysis based on gas analysis.
  • the invention is based on the use of a cracking cell in which grease or dirt from cooking is cracked during of an exothermic reaction which gives off cracking energy.
  • the measurement of this cracking energy allows us to go back to the amount of cracked cooking soiling and also the amount of soiling deposited on the walls of the cavity.
  • a system for evaluating a state of soiling of an oven cavity characterized in that the system comprises at least one dirt cracking cell, the cracking giving off cracking energy, associated temperature measurement means to the cell, means for bringing the cell to a sufficient temperature to cause cracking of dirt, means for measuring the cracking energy, and processing means associating a level of soiling with cracking energy.
  • the cracking cell used operates at a higher temperature than usual cooking temperatures, for ability to cause cracking of dirt.
  • the user can choose not to operate the cracking cell.
  • the means to bring the cell to a sufficient temperature to cause the cracking of dirt are ways cell control at a sufficient set temperature to cause cracking of dirt.
  • FIG. 1 schematically represents an evaluation system according to the invention.
  • the arrows between the blocks represent data transmissions, symbolized by letters, and the double arrows for the supply of quantities of energy, symbolized by underlined letters.
  • the system comprises a cracking cell 1, to which are connected means 2 for measuring temperature and means 3 for measuring energy. The connections of means 2 and 3 to cell 1 are symbolized by dotted lines.
  • the temperature measurement means 2 measure the temperature T at the level of the cell 1.
  • the energy measurement means 3 measure the energy E of the cracking reaction of dirt at the level of the cell 1.
  • the system also includes control means 4 and processing means 5. In a preferred embodiment of the invention described in connection with FIG. 2, the energy measurement means 3 measure the energy E indirectly by means of the control means 4.
  • the temperature measurement means 2 transmit the temperature T to the control means 4 which supply the cell 1 with a quantity Q of heat, by means of a heating element for example, in order to maintain the cell 1 at a temperature sufficient to cause cracking of dirt.
  • the set temperature is preferably substantially constant, although variable set temperatures can be envisaged.
  • the control means 4 preferably comprise a heating element making it possible to heat the cell 1.
  • the control can for example be carried out in all or nothing with a hysteresis of more or less 5 ° C, which means that the heating element stops heating when the temperature T exceeds by more than 5 ° C the set temperature and resumes heating when the temperature T drops more than 5 ° C below the set temperature.
  • the energy measurement means 3 transmit the value of the cracking energy E to the processing means 5 which associate this level E with a level N of soiling.
  • the control means 4 can be omitted, the cell 1 being brought to a sufficient temperature by the heat of the cavity, and the energy E cracking is then measured for example from the temperature rise at the level of cell 1 measurable using two judiciously placed temperature sensors: for example one upstream of the cell, the other downstream , the upstream-downstream direction being that of air circulation through cell 1.
  • the crossed arrows indicate the direction of traffic air passing through cell 1.
  • the air Upstream of cell 1, the air is charged with dirt which is for example grease from cooking.
  • this soiling undergoes cracking, that is to say that the soiling which are large molecules are divided into larger molecules small ones which are called residues here.
  • the air Downstream of cell 1, the air is charged residue.
  • Cracking is an exothermic reaction, i.e. it provides some energy per amount of cracked dirt.
  • Energy E is therefore indicative of the amount of dirt having passed through cell 1.
  • a quantity data of dirt crosses cell 1, a certain amount of dirt is deposited on the walls of the oven cavity.
  • the quantity of soiling through cell 1 is therefore indicative of the amount of dirt deposited on the walls of the oven cavity, quantity called here level N of soiling. Therefore a calibration for example allows to establish a correspondence between the energy E of cracking and the level N of dirt. When cooking, this match is made by 5 means of treatment.
  • Cell 1 is preferably a catalytic cell, i.e. that it contains a catalyst responsible for a cracking of dirt by catalyzes within cell 1.
  • Cell 1 is, for example, made up of a cylinder, ceramic, pierced with small channels whose axis is parallel to the axis of the cylinder and whose interior is lined by the catalyst in order to increase the contact surface between the catalyst and the air passing through cell 1.
  • the channels have for example a diameter of the order of a millimeter.
  • the catalyst can be palladium or platinum.
  • the set temperature for the control of the cell depends on the cell used, it is preferably between 250 ° C and 400 ° C.
  • the different means are functional representations, and that the device may include a microprocessor responsible for carrying out all or part of the operations previously described as well as coordinating them.
  • the temperature measurement means 2 comprise at least one temperature sensor temperature measuring a temperature at the cell level.
  • the means 3 for measuring the cracking energy are advantageously provided for measuring the power supplied to the means 4 control to maintain cell 1 at a set temperature given.
  • This power supplied usually comes from a power supply outdoor supply, for example electricity.
  • Measuring means 3 of energy then compare the power supplied with a power of reference corresponding to a substantially zero level of soiling, for deduce energy E.
  • FIG. 2 shows schematically two examples of profiles of power P over time t.
  • the solid line profile represents the power Pf supplied to the control means 4 during cooking.
  • the profile in dotted lines represents the reference power Pref which would have due to be supplied to the servo means 4 during the same cooking taking place in a clean oven cavity.
  • a set of powers of reference associated with the different temperatures prevailing in the cavity of oven or a law linking these reference powers, can be stored in the energy measurement means 3. Indeed, the power to provide the means 4 for controlling the cell 1 at a set temperature generally depends on the temperature prevailing in the cavity.
  • Ways 3 for energy measurement preferably include a temperature sensor advantageously located in the cooking cavity.
  • the hatched area which is the difference between the two power profiles, represents the energy E cracked.
  • the scales in Figure 2 are arbitrary.
  • a profile of Pf power supplied which would be confused with the Pref power profile of reference would correspond to a substantially zero energy E, that is to say to a substantially zero level N of dirt present in an oven cavity
  • Figure 3 shows schematically a layout preferential in the ventilation duct of a furnace of a cracking of an evaluation system according to the invention.
  • the sensors temperature are noted sensors T in the figure.
  • Cell 1 is placed in a ventilation duct 6 connecting a furnace cavity 7 and a medium outside 8 which can be the kitchen in which the oven is located.
  • cell 1 is placed at the end of line 6 which is on the side of the cavity 7, this so that the power to be supplied to control the cell 1 at the set temperature is as low as possible; it allows the servo means 4 to have a heating element less powerful.
  • the arrows represent the movement of air from cavity 7 towards the external environment 8.
  • the air upstream of cell 1, that is to say on the side of the cavity 7, is loaded with dirt.
  • cell 1 The air downstream of cell 1, i.e. side of the external environment 8, is loaded with residues.
  • cell 1 must satisfy the air flow constraints imposed by the ventilation duct 6 and the ventilation system not shown here.
  • a minimum flow is imposed in cell 1, this flow must be slow enough to be compatible with the kinetics of the reaction for example of catalysis taking place in cell 1.
  • all the air which passes through the pipe 6 ventilation also passes through cell 1, so that there is little or no of dirt in the air arriving in the external environment 8.
  • the means 3 of energy measurement not shown in Figure 3, have a first temperature sensor 9 placed upstream of the cell 1.
  • the means 3 of measurement of the cracking energy are also advantageously provided for measure the power Pf supplied to the servo means 4.
  • the first temperature sensor 9 can be the temperature regulation probe the oven cavity.
  • the temperature given by the first sensor 9 can also used to determine the power Pref of reference to be considered by the energy measurement means 3 for comparison with the power Pf supplied, as explained in FIG. 2.
  • the measuring means 2 temperature consist of a second temperature sensor 12 placed in the ventilation duct 6.
  • the second temperature sensor 12 is placed downstream of cell 1
  • the second temperature sensor 12 consists of a sensor located inside or downstream of cell 1. This sensor is preferably a thermocouple or a platinum probe.
  • the treatment means 5 can add the level N of dirt obtained to the sum ⁇ of the soiling levels of the previous cooking operations, stored in these same processing means 5, to obtain a total level NT of dirt which will be stored again to constitute the sum ⁇ of the next cooking.
  • the processing means 5 compare the level total NT at a predefined threshold Sp. When the total NT level is greater than threshold Sp, the oven cavity is considered dirty.
  • the system includes then advantageously display means 10, represented on the FIG. 4, which display an indication IS of the dirt of the oven cavity, indication transmitted to the display means 10 by the means 5 of treatment.
  • the processing means 5 may also include several thresholds Sp and the display means 10 will display the indications of corresponding dirt, for example: “slightly dirty oven”, “dirty oven”, “oven very dirty ". The user then has reliable information to be able to trigger pyrolysis wisely.
  • FIG. 5 represents a pyrolysis device 11 connected to the means 5 treatment.
  • Pyrolysis is an operation in which the temperature rises to high values, for example of the order of 500 ° C., and during which the dirt deposited on the walls is transformed solid ash that the user collects on the bottom surface of the oven cavity and in gaseous dirt which are evacuated by the ventilation duct 6, not shown in FIG. 5, and broken down by cracking in cell 1 which is active during pyrolysis.
  • a level N of non-zero dirt is transmitted by the processing means 5 to the device pyrolysis.
  • the device of pyrolysis stops the pyrolysis.
  • the value of "substantially zero" is chosen by the oven manufacturer according to the type of oven envisaged. The duration of the pyrolysis has therefore been minimized while remaining sufficiently long to make the cavity clean.
  • the sum ⁇ of the levels dirt stored in the processing means 5 is reset to zero.
  • Another option is to set the duration of the pyrolysis on this sum ⁇ : this method has the disadvantage of not being able to take into account a possible sponge stroke by the user between two pyrolysis.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP19990400878 1998-04-10 1999-04-09 Système d'évalution de l'état de salissures de la cavité d'un four Expired - Lifetime EP0950862B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9804586A FR2777345B1 (fr) 1998-04-10 1998-04-10 Systeme d'evaluation de l'etat de salissures de la cavite d'un four
FR9804586 1998-04-10

Publications (2)

Publication Number Publication Date
EP0950862A1 EP0950862A1 (fr) 1999-10-20
EP0950862B1 true EP0950862B1 (fr) 2003-11-05

Family

ID=9525175

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Application Number Title Priority Date Filing Date
EP19990400878 Expired - Lifetime EP0950862B1 (fr) 1998-04-10 1999-04-09 Système d'évalution de l'état de salissures de la cavité d'un four

Country Status (4)

Country Link
EP (1) EP0950862B1 (es)
DE (1) DE69912507T2 (es)
ES (1) ES2212488T3 (es)
FR (1) FR2777345B1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791127B1 (fr) * 1999-03-16 2001-07-06 Cepem Systeme d'evaluation de l'etat de salissures de la cavite d'un four
EP3477205B1 (de) 2017-10-25 2020-04-22 Diehl AKO Stiftung & Co. KG Elektronisches haushaltsgerät

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017628A1 (de) * 1990-05-31 1991-12-05 Bosch Siemens Hausgeraete Herd mit pyrolytischer selbstreinigung
DE4127389A1 (de) * 1991-08-19 1993-02-25 Bosch Siemens Hausgeraete Herd mit sensorgesteuerter pyrolyse

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Publication number Publication date
ES2212488T3 (es) 2004-07-16
FR2777345B1 (fr) 2000-06-30
EP0950862A1 (fr) 1999-10-20
DE69912507D1 (de) 2003-12-11
FR2777345A1 (fr) 1999-10-15
DE69912507T2 (de) 2004-09-23

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